CN111539076B - Manufacturing control method for taper angle of inner conical surface of valve sleeve of threaded plug-in overflow valve - Google Patents
Manufacturing control method for taper angle of inner conical surface of valve sleeve of threaded plug-in overflow valve Download PDFInfo
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Abstract
The manufacturing control method of the taper angle of the inner conical surface of the valve sleeve of the threaded plug-in overflow valve comprises the steps of firstly determining factors influencing the precision of the taper angle of the inner conical surface of the valve sleeve by analyzing the structural assembly relation and the operation mode of the valve sleeve valve core, then establishing a model of the taper angle deviation of the inner conical surface of the valve sleeve by taking a theoretical design bus of the inner conical surface of the valve sleeve as a central position, providing theoretical basis for the deviation precision design, and further obtaining the theoretical limit value of the upper deviation and the lower deviation; then, designing the valve sleeve inner conical surface cone angle by using the verified valve sleeve inner conical surface cone angle deviation model, and simultaneously detecting the grinding quantity of the valve sleeve inner conical surface and the valve sleeve inner conical surface in the production process by using the same detection device, so that the grinding quantity of the inner conical surface can be quickly and efficiently detected, and the angle deviation and the axial grinding quantity of the valve sleeve inner conical surface can be further controlled; the detection tool is based on the same detection device, and the calculated difference value can effectively avoid the system error of the detection device; and the actual value of the trial grinding piece is corrected and verified until all sizes are qualified, so that the quality stability and consistency of batch products are ensured.
Description
Technical Field
The invention relates to the technical field of design and manufacture of an inner conical surface taper angle of a valve sleeve, in particular to a manufacturing control method of the inner conical surface taper angle of the valve sleeve of a threaded plug-in overflow valve.
Background
In a threaded cartridge hydraulic valve, a pressure control valve is divided into a slide valve, a ball valve and a cone valve, and the cone valve has the advantages of large through flow, small leakage, good static and dynamic characteristics and the like, so that the pressure control valve is widely applied to an overflow valve. The cone valve is divided into a valve core outer cone surface and a valve sleeve inner cone surface, the machining and the detection of the valve sleeve inner cone surface are difficult to achieve, and especially for small and medium-sized enterprises without high-end equipment such as a numerical control grinding machine and a three-coordinate measuring instrument, on the basis of conventional finish machining equipment and detection means, on the premise that the product precision is improved as much as possible and the design precision is effectively controlled, the reasonable precision requirement is set, and a specific detection control method is provided, so that the method is very important.
At present, the precision design requirement for the taper angle of the inner conical surface of the valve sleeve is generally given by designers according to experience, and the designers can blindly improve the precision requirement, so that unnecessary processing difficulty is caused, whether the given precision requirement can meet the technical requirement or not can be judged accurately, and the theoretical basis of combining with the actual process is lacked; in the manufacturing process of the inner conical surface of the valve sleeve, the feeding amount of the inner conical surface of the valve sleeve is judged by an operator according to self feeling, accurate grinding amount detection control cannot be carried out, the technical requirement on a drawing is that the grinding light of the inner conical surface is generally calibrated, but the grinding of the inner conical surface of the valve sleeve cannot be directly seen, and the feeding amount control and the visible light degree of the conventional inner grinding have high randomness, so that the stability and consistency of the quality of batch products and the service life of the later period are finally influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a manufacturing control method for the taper angle of the inner conical surface of the valve sleeve of the threaded plug-in type overflow valve, so as to solve the problems in the background technology.
The technical problem solved by the invention is realized by adopting the following technical scheme:
the manufacturing control method of the taper angle of the inner conical surface of the valve sleeve of the threaded plug-in overflow valve comprises the following specific steps:
1) Determining factors influencing the accuracy of the taper angle of the internal taper of the valve sleeve
1.1 valve core Structure Assembly analysis of valve Sleeve
The valve core is arranged in the valve sleeve, the valve core and the valve sleeve are in clearance fit, a sealing line is formed by a sealing excircle of the valve core and the left end face of the sealing excircle of the valve core, the sealing line is in contact with an inner conical surface of the valve sleeve to form a contact sealing circle, the diameter of the contact sealing circle is consistent with that of the sealing excircle, the plane where the contact sealing circle is located is a sealing contact section, an outer conical surface is in contact with the valve block for positioning and sealing, the small diameter of the inner conical surface of the valve sleeve is an oil inlet drift diameter, the large diameter of the conical surface is a diameter of a section circle formed by the inner conical surface of the valve sleeve and the end face of an oil cavity of the inner groove of the valve sleeve, and the inner conical surface buses of the valve sleeve, which are respectively connected with the upper end and the lower end of the sealing line, form an inner conical surface cone angle of the valve sleeve; the valve sleeve is sleeved on the pilot valve seat in a sliding manner, prepressing springs are respectively arranged between the valve sleeve and the pilot valve seat and between the valve sleeve and the pilot valve seat, the force of the valve sleeve resetting spring is acted on a positioning reference surface, the force of the valve core resetting spring is acted on the annular end surface of the inner cavity of the valve core, the sealing line is in contact sealing with the inner conical surface of the valve sleeve under the action of the force of the valve core resetting spring, and the valve sleeve is in contact sealing with the valve block under the combined action of the valve sleeve resetting spring force and the valve core resetting spring force;
when oil is supplemented, the pressure oil overcomes the acting force of the valve sleeve reset spring force and the valve core reset spring force through the area difference action of the valve sleeve, so that the valve sleeve is separated from the contact with the valve block to open oil supplement; when high-pressure oil acts on two ends of the valve core, because the difference exists between the diameter of the sealing excircle of the valve core and the diameter of the matching excircle, namely the pressure action area difference exists, when the system pressure does not reach a set value, the sealing line is in stress contact with the inner conical surface of the valve sleeve, and when the system pressure reaches an opening pressure, the sealing line is separated from the contact with the inner conical surface of the valve sleeve to open and unload;
comprehensively, the factors influencing the cone angle precision requirement of the inner conical surface of the valve sleeve are as follows: 1. static and dynamic characteristics of the overflow valve; 2. oil-supplementing starting pressure; 3. sealability and life time based on the particular manufacturing process;
1.2 static and dynamic characteristics of overflow valve, requirement for accuracy of taper angle of inner cone
Because the set value of the cone angle of the inner cone surface of the valve sleeve has a plurality of mutual contradictions in the static and dynamic characteristics of the overflow valve, the final set value of the cone angle of the inner cone surface of the valve sleeve is optimized and selected after balancing the advantages and disadvantages according to the requirements of the static and dynamic characteristics of the application working condition of the overflow valve;
the main valve port throttling equation is:
the main valve port steady state hydraulic equation is:
F W ＝2CXD 1 p sinα (2)
in formulae (1) to (2): q V -is the amount of overflow through the main valve port;
F W -is the main valve port steady state hydrodynamic axial component;
c-is the overflow quantity coefficient of the main valve port;
x-is the opening amount of the main valve;
D 1 -a primary valve sealing diameter;
alpha-is the taper angle of the inner conical surface of the valve sleeve;
gamma-is the liquid flow gravity;
g-is the acceleration of gravity;
p-is the pressure of an overflow valve;
as can be seen from the formulas (1) and (2), the influence of the deviation after the valve sleeve inner conical surface taper angle alpha value is given on the relevant static and dynamic characteristics is small, when the selected valve sleeve inner conical surface taper angle alpha base value is 65 degrees, the influence of the sine value of the valve sleeve inner conical surface taper angle alpha value +/-1 degrees on the sine value of the base value is in a thousandth position, and the influence can be ignored relative to the base numbers of the two; machining errors of +/-1 degree belong to the rough grade precision;
1.3 oil-supplementing opening pressure requirement on inner cone angle precision
The design value of the opening pressure of the check valve adopting normal-pressure oil supplement is generally less than 0.3bar, the design value of the opening pressure of the oil supplement check valve with an oil supplement pump is generally 25 +/-5 bar, and the influence on the oil supplement opening pressure can be known by the formula (3): firstly, the rigidity deviation of the one-way valve spring, secondly, the manufacturing error of the axial dimension influencing the compression amount of the spring and thirdly, the manufacturing error of the diameter of the oil supplementing area difference of the one-way valve;
the oil supplement equation of the check valve is as follows:
P b ΔS＝P 1 ′·ΔL 1 +P 2 ′·ΔL 2 +F m (3)
in formula (3): p is b -filling the check valve with oil opening pressure;
P 1 ' -is the stiffness of the oil compensating spring 1;
P 2 ' -is the stiffness of the oil compensating spring 2;
ΔL 1 -fitting the oil compensating spring 1 with an axial compression;
ΔL 2 -fitting the oil compensation spring 2 with an axial compression;
F m -is the frictional resistance;
delta S-is the area difference of oil supplement of the one-way valve;
for conventional numerical control turning equipment, the diameter manufacturing errors of two ends of the oil supplementing area difference of the one-way valve can be controlled to be +/-0.015 mm, and the limit deviation percentage of the area difference is lower than 1%, so that the factor can be ignored; the technical requirement of the pressure deviation of the oil supplementing spring is controlled within 10 percent, which is a main factor influencing the oil supplementing pressure, the limit deviation of the oil supplementing spring accounts for 50 percent of the set deviation of the oil supplementing opening pressure after conversion, and the residual 50 percent of the deviation is distributed to the axial dimension error; the axial size of the mounting positioning surface and the spring supporting surface of the pilot valve seat, the axial size of the valve block jack and the axial positioning size of the outer sleeve are ensured by the precision of a machine tool, the axial size can be ignored, the size between the outer conical surface and the positioning reference surface can obtain high precision relatively easily, the size error from the positioning reference surface to a contact sealing line of the valve sleeve and the valve block is assumed to be +/-0.2 mm, the size error has influence on the reset spring force of the valve sleeve and the reset spring force of the valve core, the acting force on the oil supplementing opening pressure is the synthesis of the two, the acting force accounts for less than 5% of the oil supplementing opening pressure after the limit deviation conversion, the error is also +/-0.2 mm according to the positioning size of the sealing line and the axial size of the valve core, the influence on the oil supplementing opening pressure is also less than 5%, the percentage of the front and the rear two is less than 10%, and the percentage is far less than 50% of the whole deviation; therefore, the error of the positioning size of the sealing line is set to be +/-0.2 mm under the influence of the manufacturing error of the axial size of the inner conical surface of the valve sleeve on the oil supplementing pressure, and the valve sleeve has medium precision requirement on conventional numerical control equipment and internal grinding processing;
1.4 tightness requirement for taper angle accuracy of inner cone
The matching excircle of the valve core is in clearance fit with the matching inner hole of the valve sleeve, and the sealing line at the left end of the valve core is in contact sealing with the inner conical surface of the valve sleeve, so that the accuracy requirement of the runout amount is limited when the inner conical surface of the valve sleeve is opposite to the matching inner hole, and particularly the runout amount of the matching inner hole is opposite to the position of the contact sealing circle on the inner conical surface of the valve sleeve; combining an internal grinding and manufacturing process, the design requirement of the runout amount of the inner conical surface of the valve sleeve relative to the matched inner hole is selected to be 0.012-0.015 mm, the precision grade is 7-8 grade, but the contact sealing of the inner conical surface of the valve sleeve is considered, and the leakage amount of a pilot overflow valve needs to be controlled, so the shape precision of the contact sealing circle is 5-6 grade, namely 0.0015-0.0025 mm;
1.5 requirement for service life on inner cone angle precision
1.5.1 valve pocket operating conditions and process
When the cone valve type high-pressure overflow valve is in a closed state, the inner conical surface of the valve sleeve bears the high-pressure static load of the valve core, but the valve sleeve is closed after unloading to generate impact instantly, so that the inner conical surface of the valve sleeve is required to have certain impact-resistant toughness on the base part of the valve sleeve, and the part with a certain depth on the surface layer is required to have corresponding hardness, and simultaneously meets the characteristics of wear resistance, pressure resistance and impact resistance so as to achieve the pre-designed service life, therefore, the material process of the valve sleeve adopts high-strength quality-regulating materials, grinding allowance is reserved during machining, then carbonitriding heat treatment is carried out, the part with the allowance is ground and finish-machined after the heat treatment, but the carbonitriding layer is shallow, the general economic requirement is 0.4-0.5 mm, in order to obtain high surface hardness, the maximum normal grinding amount of the inner conical surface penetrating layer of the valve sleeve must be controlled within 0.1mm, namely, the maximum grinding amounts of the two ends cannot exceed 0.1mm when the lower deviation angle and the upper deviation angle reach the limit position;
2) Construction of valve sleeve inner conical surface cone angle deviation model based on process requirements
Based on the factors influencing the taper angle precision of the valve sleeve inner conical surface in the step 1), the design basic parameter items of the valve sleeve inner conical surface taper angle are large and small circles and taper angles at two ends of the valve sleeve inner conical surface, wherein the large circle diameter is the large circle diameter of the conical surface, the small circle diameter is the oil inlet drift diameter, and the taper angle is the valve sleeve inner conical surface taper angle; establishing a cone angle deviation model of the inner conical surface of the valve sleeve by taking a theoretically designed bus of the inner conical surface of the valve sleeve as a central position, wherein a deviation angle boundary line rotates by using the central point of the bus, the intersection point of an extension line of the deviation angle boundary line and a plane where a conical surface great circle is located does not exceed the range limited by the maximum normal grinding amount, and the intersection point of the extension line of the deviation angle boundary line and a cylindrical surface where an oil inlet drift diameter is located does not exceed the range limited by the maximum normal grinding amount; accordingly, the upper deviation angle is obtained according to the end point and the central point of the upper limit position, the lower deviation angle is obtained according to the end point and the central point of the lower limit position, and the numerical value of the upper deviation angle and the numerical value of the lower deviation angle obtained in the mode are slightly smaller than the numerical value of the upper deviation value and the lower deviation value obtained in a diagonal pulling mode, so that the numerical value is a further contraction of the theoretical maximum deviation value, and a calculation equation (4) and an equation (5) of the theoretical maximum deviation value and the theoretical maximum deviation value are obtained after calculation:
calculation equation of upper deviation angle β:
calculation equation of lower deviation angle θ:
in the formula: beta-is an upper deviation angle;
theta-is the lower deviation angle;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
ζ 1 -maximum normal grinding amount;
delta A-is a large cone D i And the oil inlet drift diameter D p A difference value of (a);
3) Model for verifying taper angle deviation of inner conical surface of valve sleeve
As can be seen from equations (4) and (5), the factors that determine the upper deviation angle β and the lower deviation angle θ include the cone surface major circle D i And the oil inlet drift diameter D p Maximum normal grinding amount ζ 1 Setting calculation parameters to respectively replace the formula (4) and the formula (5) and calculating an upper deviation angle value and a lower deviation angle value; the precision requirement of the machining capacity of the internal grinding and other factors on the taper angle of the inner conical surface of the valve sleeve is combined, the upper deviation and the lower deviation are further restrained, and the final design precision is determined to be +/-1 degree;
according to the finally determined up-down deviation precision requirement, the axial grinding amount of the sealing circle changes along with the changes of the up-deviation angle and the down-deviation angle, and a maximum grinding amount calculation equation (6) when the taper angle of the inner conical surface of the valve sleeve is in the up-deviation state and a maximum grinding amount calculation equation (7) when the taper angle of the inner conical surface of the valve sleeve is in the down-deviation state are obtained after calculation:
maximum grinding quantity lambda 'in upper deviation' 2max The calculation equation of (c):
in the formula: λ' 2max -is the maximum grinding amount in axial direction of the deviated sealing circle on the cone angle of the inner conical surface;
beta' -is the actual value of the upper deviation angle;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
delta B-is [ (D) i -D 1 )/2]+[ζ 1 /2cos(α/2)]；
Δ C-is [ (D) i -D 1 )/2]-[ζ 1 /2cos(α/2)]；
Maximum grinding amount lambda' at lower deviation 2max The calculation equation of (c):
in the formula: λ ″') 2max -is the axial maximum grinding amount of the deviated sealing circle under the cone angle of the inner conical surface;
theta' -is the actual value of the lower deviation angle;
ζ 1 -maximum normal grinding amount;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
Δ D-is (D) 1 -D p )/2；
When the taper angle of the inner conical surface of the valve sleeve is an ideal design value, the minimum axial grinding amount of the sealing circle can approach to zero, but the taper angle of the inner conical surface of the actual valve sleeve has deviation, and in order to ensure the grinding integrity of the inner conical surface of the whole valve sleeve, the minimum axial grinding amount of the sealing circle of the deviation value is required to be correspondingly limited in the actual deviation state of the taper angle of the inner conical surface of the valve sleeve; after calculation, a minimum grinding amount calculation equation (8) when the taper angle of the inner conical surface of the valve sleeve is in an upper deviation state and a minimum grinding amount calculation equation (9) when the taper angle of the inner conical surface of the valve sleeve is in a lower deviation state can be obtained:
minimum grinding amount lambda 'in upper deviation' 2min The calculation equation of (c):
in the formula: lambda' 2min -is the minimum grinding amount in axial direction of the deviated sealing circle on the cone angle of the inner conical surface;
beta' -is the actual value of the upper deviation angle;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
Δ D-is (D) 1 -D p )/2；
Minimum grinding amount lambda' in case of lower deviation 2min The calculation equation of (c):
in the formula: λ ″') 2min -is the axial minimum grinding of the offset sealing circle under the inner cone angle;
theta' -is the actual value of the lower deviation angle;
ζ 1 -is the maximum normal grinding amount;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
Δ C-is [ (D) i -D 1 )/2]-[ζ 1 /2cos(α/2)]；
Taking the set data as a quantitative analysis basis, and respectively substituting the data into an equation (6), an equation (7), an equation (8) and an equation (9) to obtain a characteristic diagram of the axial grinding amount deviation and the tolerance variation trend of the seal circle; the change of the factor value difference is small, and each curve is approximately linearly changed on the whole;
4) Designing the taper angle of the inner conical surface of the valve sleeve by using the taper angle deviation model of the inner conical surface of the valve sleeve verified in the step 3), and detecting the inner conical surface of the valve sleeve in the production process by using an angle detection tool
The angle detection gauge comprises a gauge main body, a gauge excircle in clearance fit with a fit inner hole, a ring groove for floating support, a detection great circle and a detection small circle, wherein the detection great circle and the detection small circle are used for measuring the inner conical surface of a valve sleeve; the detection large circle and the detection small circle respectively form an acute contact angle with the end face of the detection tool body, and process holes are formed in the two ends of the detection tool body along the rotation center; in addition, the gauge main body, the gauge excircle, the annular groove, the detection big circle and the detection small circle are of a coaxial structure; the diameter of the outer circle of the checking fixture is smaller than the lower deviation value of the diameter of the matched inner hole, the checking fixture main body is processed by a machine and then subjected to high hardness treatment, the process hole is ground in advance after heat treatment, the outer circle of the checking fixture, the annular groove support circle, the detection large circle, the detection small circle and the end faces at two ends are ground in a fine grinding manner after grinding, so that the coaxiality of the outer circle of the fine machining and the verticality of the end faces at two ends relative to the detection large circle and the detection small circle are ensured, keeping the sharp edge of the contact acute angle after finish machining, removing flash burrs by manual soft throwing, detecting that the diameter of a small circle is close to the drift diameter of oil inlet according to theoretical error analysis, detecting that the diameter of a large circle is close to the diameter of a large circle of a conical surface, and keeping the diameter difference of 0.3-0.4 mm so as to reduce detection errors; when the small detection round end is placed in the inner cone surface of the valve sleeve, the length of the detection tool is limited to enable the large detection round end to exceed the end surface of the valve sleeve by 5-6 mm;
the detection principle is as follows: arranging a valve sleeve inner conical surface bus as a bevel edge in a right triangle, converting a half angle of an actual valve sleeve inner conical surface cone angle after acquiring two corresponding right-angle edges, wherein the length of the half angle opposite edge is half of the difference value between the detected large circular diameter and the detected small circular diameter, and the length of the adjacent edge of the half angle is the difference value between the detected large circular axial length and the detected small circular axial length;
the calculation equation of the taper angle of the inner conical surface of the actually processed valve sleeve is as follows:
in the formula: alpha' -is the actual machining inner conical surface cone angle;
δ 1 -is the half-angle edge length;
δ 2 -is the half-angle neighbor length;
d 3 -detecting the measured value of the small circle diameter;
d 4 -detecting the measured value of the diameter of the large circle;
L 4 -detecting an actual value of axial length for detecting the great circle;
L 5 -detecting the measured axial length for the detection of the small circles;
the actual machining valve sleeve inner conical surface cone angle alpha ' is indirectly obtained through a measured value, the actually machined valve sleeve inner conical surface cone angle alpha ' can be expressed as a multivariate function of an actually measured value, and according to an error theory, an equation of the actually machined inner conical surface cone angle measurement error delta alpha ' is as follows:
in the formula: d 3 * -detecting the true value of the small circle diameter;
d 4 * -detecting the true value of the major circle diameter;
L 4 * -detecting the true value of the axial length for detecting the great circle;
L 5 * -detecting the real value of the axial length for detecting the small circles;
its linearized error transfer formula (higher order term):
in the formula: Δ d of 3 Is d 3 The measurement error of (2);
Δd 4 is d 4 The measurement error of (2);
ΔL 4 -is L 4 The measurement error of (2);
ΔL 5 -is L 5 The measurement error of (2);
the transfer coefficients of the above errors are:
the larger the difference value between the diameter of the detected large circle and the diameter of the detected small circle can be obtained by the error transfer coefficients, the smaller the measuring error of the cone angle of the inner conical surface is;
5) The grinding amount detection device is adopted to detect the grinding amount of the inner conical surface of the valve sleeve in the production process
The grinding amount detection device has the same basic structure and technical requirements as an angle detection gauge, only the diameter of a detection circle is different, the diameter of the detection sealing circle is consistent with the diameter of a sealing excircle and the diameter of a contact sealing circle, and in view of the gap between a matching inner hole of a valve sleeve and the excircle of the detection gauge, in order to eliminate the gap influence and improve the detection precision, a soft interference floating support mode is adopted, a rubber ring for floating support is tensioned and sleeved on a support circle, the number of the rubber ring is more than or equal to 2, the sleeved rubber ring and the matching inner hole of the valve sleeve are in an interference state, and the interference value of the floating support is 0.1-0.2 mm; the retainer ring is open, a gap is kept between the periphery of the retainer ring and the excircle of the checking tool after the retainer ring is sleeved, and the gap value of the retainer ring is 0.2-0.3 mm;
detecting the axial grinding quantity of the sealing circle, namely placing a detection tool into a valve sleeve, firstly measuring the size between a transfer reference surface before grinding and the outer end surface of the detection tool, and after grinding the inner conical surface of the valve sleeve, detecting the size between the transfer reference surface and the outer end surface of the detection tool, wherein the difference value of the two sizes is the actual axial grinding quantity of the sealing circle;
in the machining process of the valve sleeve, the taper angle precision of the inner conical surface of the valve sleeve is ensured by a machine tool, but the axial size of a contact sealing circle on the inner conical surface of the valve sleeve relative to a transfer reference surface is indirectly obtained and is influenced by a plurality of factors, so that after the heat treatment of the valve sleeve, the size between the transfer reference surface before grinding and the outer end surface of a checking tool is firstly graded, the transfer reference surface is used as an axial positioning reference during grinding processing, and grinding is adjusted in batches according to grades, so that the grinding wheel impact caused by large grinding amount deviation due to large axial size difference of the inner conical surface of the valve sleeve relative to the transfer reference surface can be avoided, and the processing quality and the production efficiency are finally influenced;
6) Correction trial grinding piece
After the valve sleeve is subjected to trial grinding, detecting the size between the transfer reference surface after grinding and the outer end surface of the checking fixture and calculating the actual value of the axial grinding amount; detecting relevant parameters of the cone angle of the valve sleeve inner conical surface of the trial grinding piece according to the method, converting the cone angle of the valve sleeve inner conical surface actually machined according to the formula (10), confirming that the value is in a theoretically designed tolerance range, simultaneously calculating a corresponding actual deviation angle, correspondingly substituting the actual deviation angle into a formula (6), a formula (7), a formula (8) or a formula (9) according to the fact that the cone angle of the valve sleeve inner conical surface is in an upper deviation or a lower deviation, converting the maximum value and the minimum value of the axial grinding amount corresponding to the actual deviation angle at a sealing circle, wherein the actual value of the axial grinding amount calculated by the detection needs to fall in the range of the maximum value and the minimum value of the axial grinding amount, and the trial grinding piece is a qualified product; if the actual axial grinding amount value of the trial grinding piece does not fall within the range, and the actual taper angle of the inner conical surface of the valve sleeve is within the precision design range and approaches the ideal value, only the difference value needs to be calculated at the moment to readjust the feeding amount, and the angle of the grinding wheel does not need to be trimmed again; if the actual taper angle of the inner conical surface of the valve sleeve approaches the upper and lower deviation values or exceeds the deviation value, the dressing angle of the grinding wheel is adjusted again, and the detection process is repeated after trial grinding until all sizes are qualified;
because the angle detection gauge and the grinding quantity detection device are based on the same detection device, the calculated difference value can effectively avoid the system error of the detection device.
Has the beneficial effects that:
1) According to the method, through comprehensive analysis of influence factors of the cone angle precision requirement of the valve sleeve, the main influence factors are determined to be the sealing performance and the service life based on a specific process, a cone angle deviation model of the valve sleeve inner cone is constructed based on the main influence factors, a theoretical basis is provided for deviation precision design, and therefore the theoretical limit value of the upper deviation and the lower deviation is obtained;
2) According to the method, the verified valve sleeve inner conical surface cone angle deviation model is used for designing the valve sleeve inner conical surface cone angle, the angle detection tool is used for detecting the valve sleeve inner conical surface in the production process, and the grinding amount detection device is used for detecting the grinding amount of the valve sleeve inner conical surface in the production process, so that the inner conical surface grinding amount can be detected quickly and efficiently, and the valve sleeve inner conical surface angle deviation and the axial grinding amount are controlled; the angle detection gauge and the grinding quantity detection device are based on the same detection device, and the calculated difference value can effectively avoid the system error of the detection device;
3) The invention adopts a soft interference floating support scheme, thereby further improving the detection precision;
4) In the invention, the detected actual value of the trial grinding piece is substituted into a deviation equation, the maximum value and the minimum value of the axial grinding amount of the seal circle corresponding to the actual deviation angle are calculated, and the actual measurement value is corrected and verified until all the dimensions are qualified, thereby ensuring the stability and the consistency of the quality of batch products.
Drawings
Fig. 1 is a schematic view of the assembly of a valve sleeve and a valve core according to a preferred embodiment of the present invention.
Fig. 2 is a schematic view of a valve housing according to a preferred embodiment of the present invention.
Fig. 3 is a schematic view of the principle of angular deviation of the present invention.
FIG. 4 is a schematic diagram illustrating the axial grinding tolerance deviation and tolerance trend of the seal circle in the preferred embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an angle detection fixture in a preferred embodiment of the invention.
Fig. 6 is a schematic structural diagram of a grinding amount detecting device in a preferred embodiment of the present invention.
FIG. 7 is a schematic view of a floating support structure in accordance with a preferred embodiment of the present invention.
FIG. 8 is a schematic diagram illustrating the principle of angle detection in the preferred embodiment of the present invention.
Fig. 9 is a schematic diagram illustrating a principle of detecting a grinding amount in a preferred embodiment of the present invention.
The attached drawings are marked as follows:
in fig. 1: b is a valve block, V is a valve sleeve, N is an inner conical surface, W is an outer conical surface, S is a valve core, k is a sealing line, d 0 To match the diameter of the outer circle, d 1 To seal the diameter of the outer circle, D p To the drift diameter of the oil inlet, F 1 For valve sleeve restoring spring force, F 2 A valve core reset spring force;
in fig. 2: alpha is the taper angle of the inner conical surface of the valve sleeve, L 0 For positioning the length dimension, L, of the sealing line 1 Reference transfer length dimension, y seal contact cross-section, e transfer reference plane, h positioning reference plane, D 0 To match the inner hole diameter, D 1 To contact sealing circle diameter, D i The diameter of the cone is large;
in fig. 3: theta is the lower deviation angle, beta is the upper deviation angle, D c Is a central circle, D 1 Is a contact sealing circle, alpha/2 is a half angle of an inner conical surface of the valve sleeve, D i Is a large cone, D p For the diameter of the oil inlet, ζ 1 To maximize the normal grinding amount, λ 1 For maximum normal grinding corresponding to axial dimension, ζ 2 For sealing the grinding quantity in the normal direction of the circle, λ 2 The axial grinding amount of the sealing circle is obtained;
in fig. 5: r is acute contact angle, L 2 Is the length of the angle checking tool d t To support the diameter of the circle, d 2 To examine the diameter of the outer circle, d 3 For measuring small circle diameters, d 4 To detect large circle diameters;
in FIG. 6: r is acute contact angle, L 3 Length of the tool for the grinding amount detecting device, d t To support the diameter of the circle, d 2 To examine the diameter of the outer circle, d 5 To detect the diameter of the seal circle;
in FIG. 7: mu is the interference of floating support, epsilon is the clearance of retainer ring, D 0 To match the inner bore diameter, d 2 The diameter of the outer circle of the checking fixture;
in fig. 8: delta 1 Is the length of the half angle pair edge, delta 2 Is the length of the adjacent side of the half angle, alpha'/2 is the actual half angle, L 4 For measuring axial length of great circles, L 5 Detecting the axial length for detecting the small circle;
in fig. 9: l is a For grinding the axial position dimension of the front sealing circle, L b The axial position size of the sealing circle after grinding.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific drawings.
The manufacturing control method of the taper angle of the inner conical surface of the valve sleeve of the threaded plug-in overflow valve comprises the following specific steps:
1) Determining factors influencing the accuracy of the taper angle of the internal taper of the valve sleeve
1.1 valve core structure assembly of valve sleeve
As shown in fig. 1 and 2, the valve core S is disposed in the valve housing V, and the valve core S and the valve housing V are in clearance fit, a sealing line k is formed between a sealing outer circle of the valve core S and a left end surface of the valve core S, the sealing line k contacts with an inner conical surface N of the valve housing to form a contact sealing circle, and the diameter D of the contact sealing circle 1 Diameter d of sealing outer circle 1 The plane of the contact sealing circle is a sealing contact section y, the outer conical surface W is in contact with the valve block B for positioning and sealing, and the small diameter of the inner conical surface N of the valve sleeve is the oil inlet drift diameter D p Large diameter of cone D i The diameter of a truncated circle formed by a valve sleeve inner conical surface N and the end surface of an oil cavity of a valve sleeve inner groove is adopted, and the cone angle alpha of the inner conical surface is the full angle of the valve sleeve inner conical surface N; the valve sleeve V is slidably sleeved on the pilot valve seat, a prepressing spring is respectively arranged between the valve sleeve V and the valve core S and the pilot valve seat, and the valve sleeve resetting spring force F 1 Acting on the positioning reference surface h, the valve core reset spring force F 2 Acting on the annular end surface of the inner cavity of the valve core, and resetting the spring force F of the valve core 2 Under the action of (1), a sealing line k is in contact sealing with an inner conical surface N of the valve sleeve at a position F 1 And F 2 Under the combined action of the valve sleeve V and the valve block B, the valve sleeve V is contacted and sealed;
the area difference of the pressure oil passing through the valve sleeve V is used for overcoming F during oil supplement 1 And F 2 The valve sleeve V is separated from the contact with the valve block B to open oil supplement; when high-pressure oil acts on two ends of the valve core S, the diameter d of the sealing excircle of the valve core S 1 And the diameter d of the matched excircle 0 When the system pressure reaches the opening pressure, the sealing line k is separated from the contact with the valve sleeve inner conical surface N to open unloading;
TABLE 1 difference table of sine value of angle deviation
Comprehensively, the factors influencing the requirement of the taper angle of the inner conical surface of the valve sleeve are as follows: 1. static and dynamic characteristics of the overflow valve; 2. oil supply starting pressure; 3. sealability and life time based on the particular manufacturing process;
1.2 static and dynamic characteristics of overflow valve, requirement for accuracy of taper angle of inner cone
The set value of the taper angle alpha of the inner conical surface of the valve sleeve has a plurality of contradictions in the static and dynamic characteristics of the overflow valve, such as: for overflow quantity, the trend of the taper angle alpha of the inner conical surface of the valve sleeve to the maximum sine value is beneficial, but the trend of the taper angle alpha of the inner conical surface of the valve sleeve to the minimum sine value is more beneficial for obtaining smaller hydrodynamic force influence; therefore, the final setting of the taper angle alpha value of the inner conical surface of the valve sleeve is optimized and selected after balancing the advantages and disadvantages according to the static and dynamic characteristic requirements of the application working condition of the overflow valve;
the main valve port throttling equation is:
the main valve port steady state hydraulic equation is:
F W ＝2CXD 1 p sinα (2)
in the formula: q V -is the amount of overflow through the main valve port;
F W -is the main valve port steady state hydrodynamic axial component;
c-is the overflow coefficient of the main valve port;
x-is the opening amount of the main valve;
D 1 -a primary valve seal diameter;
alpha-is the taper angle of the inner conical surface of the valve sleeve;
gamma-is the liquid flow gravity;
g-is the acceleration of gravity;
p-is the pressure of an overflow valve;
as can be seen from the formulas (1) and (2), the influence of the deviation after the valve sleeve inner conical surface taper angle alpha value is given on the relevant static and dynamic characteristics is small, as shown in table 1, when the base value of the valve sleeve inner conical surface taper angle alpha is selected to be 65 degrees, the influence of the sine value of the valve sleeve inner conical surface taper angle alpha value +/-1 degrees on the sine value of the base value is in a thousandth position, and the influence can be ignored relative to the base values of the two; machining errors of +/-1 degree belong to the rough grade precision;
1.3 oil-supplementing opening pressure requirement on inner cone angle precision
The design value of the opening pressure of the check valve for oil supplement under normal pressure is generally less than 0.3bar, the design value of the opening pressure of the check valve for oil supplement with an oil supplement pump is generally 25 +/-5 bar, and the opening pressure of the oil supplement can be influenced by the formula (3): firstly, the rigidity deviation of the one-way valve spring, secondly, the manufacturing error of the axial dimension influencing the compression amount of the spring and thirdly, the manufacturing error of the diameter of the oil supplementing area difference of the one-way valve;
the oil supplement equation of the check valve is as follows:
P b ΔS＝P 1 ′·ΔL 1 +P 2 ′·ΔL 2 +F m (3)
in the formula: p is b -filling the check valve with oil opening pressure;
P 1 ' -is the stiffness of the oil compensating spring 1;
P 2 ' -is the stiffness of oil compensation spring 2;
ΔL 1 -fitting the oil compensating spring 1 with an axial compression;
ΔL 2 -fitting the oil compensation spring 2 with an axial compression;
F m -is the frictional resistance;
delta S-is the area difference of oil supplement of the one-way valve;
for conventional numerical control turning equipment, the diameter manufacturing errors of two ends of the oil supplementing area difference of the one-way valve can be controlled to be +/-0.015 mm, and the limit deviation percentage of the area difference is lower than 1 percent, so the factor can be ignored; the technical requirement of the pressure deviation of the oil supplementing spring is controlled within 10%, which is a main factor influencing the oil supplementing pressure, the limit deviation of the oil supplementing spring accounts for 50% of the set deviation of the oil supplementing opening pressure after conversion, and the residual 50% of the deviation is distributed to the axial dimension error; the axial dimension of the mounting and positioning surface of the pilot valve seat and the spring supporting surface, the axial dimension of the valve block jack and the axial positioning dimension of the outer sleeve are ensured by the precision of the machine tool, the axial dimension can be ignored, the dimension between the outer conical surface W and the positioning reference surface h can relatively easily obtain higher precision, and if the dimension error from the positioning reference surface h to the contact sealing line of the valve sleeve V and the valve block B is +/-0.2 mm, the dimension error is F 1 And F 2 All influence is caused, the acting force on the oil supply opening pressure is the composition of the two, the limit deviation accounts for less than 5 percent of the set deviation value of the oil supply opening pressure after conversion, and the positioning size L of the sealing line 0 The axial size of the valve core S also gives an error of +/-0.2 mm, the influence on the oil supply opening pressure is also less than 5%, the percentage of the front and the rear accounts for less than 10%, and the percentage is far less than 50% of the integral deviation; therefore, the manufacturing error of the axial dimension of the inner conical surface N of the valve sleeve has the influence on the oil supplementing pressure, and the positioning dimension L of the sealing line of the valve sleeve 0 The error of the numerical control machine is set to be +/-0.2 mm, and the numerical control machine meets the medium precision requirement on conventional numerical control equipment and internal grinding processing;
1.4 tightness requirement for taper angle accuracy of inner cone
The matching excircle of the valve core S is in clearance fit with the matching inner hole of the valve sleeve V, and the sealing line k at the left end of the valve core S is in contact sealing with the inner conical surface N of the valve sleeve, so that the inner conical surface N of the valve sleeve is in relative fitThe inner hole has the requirement of limiting the accuracy of the jumping quantity, particularly the jumping quantity of the corresponding matched inner hole at the position of a contact sealing circle on the inner conical surface N of the valve sleeve; taking the pilot overflow valve structure as an example, the valve core S and the valve sleeve V are matched by adopting a sealing element for preventing leakage, so that the valve core S and the valve sleeve V need to be designed with a larger matching clearance which is more than 0.06mm and has a contact sealing circular diameter D 1 The design value of the valve sleeve is 9.25mm, the design requirement of the bounce amount of the inner conical surface N of the valve sleeve relative to the matched inner hole is selected to be 0.012-0.015 mm and the precision grade is 7-8 grade by combining an inner circle grinding and manufacturing process, but the self shape precision of a contact sealing circle is 5-6 grade, namely 0.0015-0.0025 mm, considering the contact sealing of the inner conical surface N of the valve sleeve and controlling the leakage amount of a thread plug-in overflow valve;
1.5 requirement for service life on inner cone angle precision
1.5.1 valve pocket operating conditions and process
When the threaded plug-in type overflow valve is in a closed state, the inner cone surface N of the valve sleeve V bears the high-pressure static load of the valve core S, but impact is generated at the closing moment after unloading, so the inner cone surface N of the valve sleeve V requires that a base part of the valve sleeve V needs to have certain impact resistance toughness, a part with a certain depth of a surface layer needs to have corresponding hardness, and the characteristics of wear resistance, pressure resistance and impact resistance are simultaneously met to achieve the pre-designed service life, the material process of the valve sleeve V adopts a high-strength quality adjusting material, a grinding allowance is reserved during machining, then carbonitriding heat treatment is carried out, and the part with the allowance is ground and finely processed after heat treatment, but the carbonitriding layer is shallow, the general economic requirement is 0.4-0.5 mm, and in order to obtain high surface hardness, as shown in figure 3, the maximum grinding normal value zeta of the inner cone surface N-penetrated layer of the valve sleeve is the highest in the grinding normal value 1 The maximum grinding amount at two ends cannot exceed 0.1mm when the lower deviation angle theta and the upper deviation angle beta reach the limit positions;
2) Construction of valve sleeve inner conical surface cone angle deviation model based on process requirements
As shown in FIG. 3, the most direct way to obtain the angle of vertical deviation is to draw a diagonal line in a trapezoid formed by the thickness of 0.1mm in the normal direction of the inner conical surface N of the valve sleeve, and the small included angles formed by the two diagonal lines and the ideal inner conical surface N of the valve sleeve are vertical deviationsThe theoretical maximum value, but the four vertexes of the trapezoid on which the deviation value obtained in this way depends are not the design basic parameter items of the valve sleeve inner conical surface N, and are based on the factors influencing the accuracy of the valve sleeve inner conical surface cone angle in the step 1), the design basic parameter items of the valve sleeve inner conical surface N cone angle are the big and small circles at the two ends of the valve sleeve inner conical surface and the cone angle, and the big diameter is the big diameter D of the cone i The diameter of the small circle is the drift diameter D of the oil inlet p The taper angle is the taper angle alpha of the inner conical surface of the valve sleeve; establishing a cone angle deviation model of the inner conical surface of the valve sleeve by taking a theoretical design bus of the inner conical surface N of the valve sleeve as a central position, rotating a deviation angle boundary line by using a central point of the bus, and ensuring that an intersection point of an extension line of the deviation angle boundary line and a plane where a conical surface great circle is positioned does not exceed a maximum normal grinding amount zeta 1 The defined range, the extension of the deviation angle boundary line and the oil inlet path D p The intersection point of the cylindrical surfaces should not exceed the maximum normal grinding amount ζ 1 In the limited range, because the taper angle alpha of the inner conical surface of the valve sleeve is not 90 degrees and is based on the trapezoidal characteristic, only one end of the intersection point of two ends of the extension line reaches a limit position firstly, and when the end reaches the limit position, a small included angle formed by the deviation angle boundary line and a bus in the same plane is a deviation value, the actual taper angle alpha of the inner conical surface of the valve sleeve is less than 90 degrees, so that the upper end of the upper deviation angle beta boundary line reaches an upper limit position firstly, and the lower end of the lower deviation angle theta boundary line reaches a lower limit position firstly; accordingly, the upper deviation angle β is obtained from the upper limit position end point and the center point, the lower deviation angle θ is obtained from the lower limit position end point and the center point, and the upper deviation angle value and the lower deviation angle value obtained in the method are slightly smaller than the upper deviation value and the lower deviation value obtained by the diagonal line pulling method, so that the values are further contracted from the theoretical maximum deviation value, and a calculation equation (4) and an equation (5) of the upper deviation angle value and the lower deviation angle value are obtained after calculation:
calculation equation of upper deviation angle β:
calculation equation of lower deviation angle θ:
in the formula: beta-is an upper deviation angle;
theta-is a lower deviation angle;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
ζ 1 -maximum normal grinding amount;
delta A-is a large cone D i And oil inlet diameter D p A difference of (d);
3) Model for verifying taper angle deviation of inner conical surface of valve sleeve
As can be seen from equations (4) and (5), the factors that determine the upper deviation angle β and the lower deviation angle θ include: conical surface great circle D i And the oil inlet drift diameter D p Maximum normal grinding amount ζ 1 Taking the design of a pilot operated relief valve as an example, calculating parameters of the relief valve are shown in table 2 and respectively substituted into formula (4) and formula (5), and calculating an upper deviation angle beta value of 1.368 DEG and a lower deviation angle theta value of 1.339 DEG; on the basis of the parameters in the table 2, an upper deviation angle beta value obtained in a diagonal pulling mode is 1.405 degrees, a lower deviation angle theta value is 1.374 degrees, the upper deviation and the lower deviation are further restricted by combining the precision requirements of the internal grinding processing capacity and other factors on the taper angle alpha of the inner conical surface of the valve sleeve, and the final design precision can be determined to be +/-1 degree;
TABLE 2 Overflow valve calculation parameter table
According to the finally determined up-down deviation precision requirement, the axial grinding quantity lambda of the sealing circle 2 The maximum grinding amount calculation equation (6) when the valve sleeve inner conical surface taper angle alpha is in the upper deviation state and the maximum grinding amount calculation equation (7) when the valve sleeve inner conical surface taper angle alpha is in the lower deviation state are obtained through calculation along with the change of the upper deviation angle and the lower deviation angle, and the sealing circle normal grinding amount zeta is known from the equations (6) and (7) when the valve sleeve inner conical surface taper angle alpha is designed to be an ideal state value 2 Maximum normal grinding amount ζ 1 The consistency is kept between the first and the second,axial grinding amount lambda of sealing circle 2 Axial dimension lambda corresponding to maximum normal grinding quantity 1 In accordance with the grinding amount lambda of the sealing circle in the axial direction 2 As can be seen from equation (6), the seal circle axis direction maximum grinding allowance λ ' at the time of the upward deviation as the upward deviation angle actual value β ' increases ' 2max Gradually decrease; from the equation (7), as the actual value θ 'of the lower deviation angle increases, the maximum grinding amount λ ″' of the seal circle axis at the time of the lower deviation 2max The trend is gradually reduced;
maximum grinding quantity lambda 'during upper deviation' 2max The calculation equation of (2):
in the formula: lambda' 2max -is the maximum grinding amount in axial direction of the deviated sealing circle on the cone angle of the inner conical surface;
beta' -is the actual value of the upper deviation angle;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
delta B-is [ (D) i -D 1 )/2]+[ζ 1 /2cos(α/2)]；
Δ C-is [ (D) i -D 1 )/2]-[ζ 1 /2cos(α/2)]；
Maximum grinding amount lambda' at lower deviation 2max The calculation equation of (2):
in the formula: λ ″') 2max -is the maximum axial grinding of the offset sealing circle under the inner cone angle;
theta' -is the actual value of the lower deviation angle;
ζ 1 -is the maximum normal grinding amount;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
Δ D-is (D) 1 -D p )/2；
When the taper angle alpha of the inner conical surface of the valve sleeve is an ideal designIn value, the minimum grinding amount lambda of the sealing circle in the axial direction 2 The valve sleeve inner conical surface cone angle alpha can approach to zero, but the actual valve sleeve inner conical surface cone angle alpha has deviation, and in order to ensure the grinding integrity of the whole valve sleeve inner conical surface N, the actual deviation state of the valve sleeve inner conical surface cone angle alpha is required to correspondingly limit the sealing circle axial grinding amount lambda of the deviation value 2 Minimum value of (d); the calculation results show a minimum cut amount calculation equation (8) when the valve sleeve inner cone angle α is in the upward deviation state and a minimum cut amount calculation equation (9) when the valve sleeve inner cone angle α is in the downward deviation state, and as the actual value β ' of the upward deviation angle increases, the minimum cut amount λ ' of the seal circle axis during the upward deviation state is shown in equations (8) and (9) ' 2max Gradually increasing; the minimum grinding amount lambda 'of the axial direction of the sealing circle in the lower deviation is increased along with the increase of the actual value theta' of the lower deviation angle 2max The trend is gradually increased;
minimum grinding stock lambda 'in upper deviation' 2min The calculation equation of (2):
in the formula: λ' 2min -is the minimum grinding of the inner conical cone angle in the axial direction of the deviated sealing circle;
beta' -is the actual value of the upper deviation angle;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
Δ D-is (D) 1 -D p )/2；
Minimum grinding amount lambda' during lower deviation 2min The calculation equation of (c):
in the formula: lambda ″', and 2min -is the axial minimum grinding of the offset sealing circle under the inner cone angle;
theta' -is the actual value of the lower deviation angle;
ζ 1 -maximum normal grinding amount;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
Δ C-is [ (D) i -D 1 )/2]-[ζ 1 /2cos(α/2)]；
The data of the threaded insert type relief valve was used as a basis for quantitative analysis, and the data were substituted for the formula (6), the formula (7), the formula (8), and the formula (9), respectively, to obtain the seal circle axial grinding amount λ shown in fig. 4 2 An upper deviation limit value and a lower deviation limit value which change along with the upper deviation angle and the lower deviation angle and a corresponding tolerance value change trend characteristic diagram; in fig. 4, the right solid line is a variation curve of the maximum grinding amount in the axial direction of the sealing circle when the taper angle α of the inner tapered surface of the valve sleeve is in the upper deviation, and the right dotted line is a variation curve of the minimum grinding amount in the axial direction of the sealing circle when the taper angle α of the inner tapered surface of the valve sleeve is in the upper deviation; the left solid line is a change curve of the maximum grinding amount of the axial direction of the sealing circle when the taper angle alpha of the inner conical surface of the valve sleeve is in lower deviation, and the left virtual line is a change curve of the minimum grinding amount of the axial direction of the sealing circle when the taper angle alpha of the inner conical surface of the valve sleeve is in lower deviation; the right dotted line is a variation curve of the axial grinding tolerance value of the sealing circle when the taper angle alpha of the inner conical surface of the valve sleeve is in an upper deviation, and the left dotted line is a variation curve of the axial grinding tolerance value of the sealing circle when the taper angle alpha of the inner conical surface of the valve sleeve is in a lower deviation; the change of the factor value difference is small, and each curve is approximately linearly changed on the whole;
from the variation trend of each curve in fig. 4, the maximum grinding amount variation rate in the axial direction of the sealing circle when the taper angle α of the inner conical surface of the valve sleeve is in the upper deviation is less than the variation rate when the taper angle α of the inner conical surface of the valve sleeve is in the lower deviation; when the taper angle alpha of the inner conical surface of the valve sleeve is in the lower deviation, the change rate of the axial minimum grinding amount of the sealing circle is larger than the change rate when the taper angle alpha of the inner conical surface is in the lower deviation; the tolerance change rates of the upper deviation state and the lower deviation state are approximately consistent as a whole, namely the tolerance values of the axial grinding quantity of the sealing circle obtained when the same upper deviation angle value and the lower deviation angle value are corresponded are consistent; however, as can be intuitively seen from fig. 4, the minimum grinding amount and the maximum grinding amount corresponding to the same upper deviation angle and lower deviation angle are significantly different, the minimum grinding amount in the upper deviation is larger than the minimum grinding amount in the lower deviation, and the maximum grinding amount in the upper deviation is also larger than the maximum grinding amount in the lower deviation; therefore, in the actual manufacturing process, when the same tolerance value of the axial grinding amount of the actual sealing circle is obtained, for example, in order to improve the production efficiency and reduce the abrasion of the grinding wheel, when the dressing angle of the grinding wheel is adjusted, the lower deviation state of the taper angle alpha of the inner conical surface of the valve sleeve is set to be favorable when the ideal design value is approached; however, if the deformation of the valve sleeve inner conical surface N is caused by heat treatment or other factors, and a larger axial grinding amount is needed to compensate the deformation defect, it is more favorable to set the valve sleeve inner conical surface cone angle alpha in an upper deviation state when the ideal design value is approached;
when the actual value of the upper deviation angle reaches 1 degree, the tolerance value of the axial grinding amount of the sealing circle is 0.0523mm, and when the actual value of the upper deviation angle reaches 1.3 degrees, the tolerance value of the axial grinding amount of the sealing circle is only 0.0135mm; in addition, when the actual value of the lower deviation angle reaches 1 degree, the tolerance value of the axial grinding amount of the sealing circle is 0.0521mm, and when the actual value of the lower deviation angle reaches 1.3 degrees, the tolerance value of the axial grinding amount of the sealing circle is only 0.0104mm; it can be seen that, in combination with the subsequent actual manufacturing process, the upper deviation angle and the lower deviation angle obtained by the equations (4) and (5) are not suitable to be directly used as precision design values, and the above design of the deviation angle precision as ± 1 ° belongs to reasonable constraints;
4) Designing the taper angle of the inner conical surface of the valve sleeve by using the taper angle deviation model of the inner conical surface of the valve sleeve verified in the step 3), and detecting the inner conical surface of the valve sleeve in the production process by using an angle detection detector
In the practical production process of the valve sleeve, the taper angle alpha of the inner conical surface of the valve sleeve and the axial grinding quantity lambda of the sealing circle cannot be carried out on each part even if a three-coordinate measuring instrument is adopted 2 The full detection is carried out, so that a rapid angle detection check tool needs to be designed to be suitable for detection control of actual manufacturing;
as shown in figure 5, the angle detection gauge comprises a gauge main body, a gauge excircle in clearance fit with a matched inner hole, a circular groove for floating support, a detection great circle and a detection small circle, wherein the detection great circle is positioned at one end of the gauge main body, the detection small circle is positioned at the other end of the gauge main body, the circular groove is arranged on the gauge main body positioned at one side of the detection great circle, the whole circular groove is positioned in the axial position of the matched inner hole and positioned at two sides of the circular groove simultaneouslyThe excircle of the checking tool keeps a section of axial vector to be correspondingly matched with the matching inner hole; the detection large circle and the detection small circle respectively form an acute contact angle with the end face of the detection tool body, and process holes are formed in the two ends of the detection tool body along the rotation center; in addition, the gauge main body, the gauge outer circle, the annular groove, the detection large circle and the detection small circle are of a coaxial structure; excircle diameter d of checking fixture 2 Smaller than the diameter D of the inner hole 0 With a tolerance of 0 to-0.01 mm based on the lower deviation value, and a diameter d of a supporting circle of the annular groove t Selecting specific dimensions and tolerances according to the selected floating support assembly; after the detection tool main body is machined, high-hardness treatment is carried out, the process hole is ground in advance after heat treatment, the outer circle of the detection tool, the annular groove support circle, the detection large circle, the detection small circle and the end faces at two ends are ground in a fine grinding mode to guarantee coaxiality of the outer circle of the fine machining tool and perpendicularity of the end faces at two ends relative to the detection large circle and the detection small circle, a formed sharp edge of a contact acute angle r is kept after the fine machining, burrs and the diameter d of the detection small circle are removed through manual soft polishing, and according to theoretical error analysis, the diameter d of the detection small circle is detected 3 Approximate oil inlet drift diameter D p Detecting the diameter d of the major circle 4 Approximate cone major diameter D i And the diameter difference is kept between 0.3mm and 0.4mm so as to reduce the detection error; when the small circular end is detected to be embedded into the valve sleeve inner conical surface N of the valve sleeve V, the length L of the detection tool is limited 2 The detection big round end of the valve sleeve exceeds the V end surface of the valve sleeve by 5-6 mm;
the detection principle is as follows: the generatrix of the valve sleeve inner conical surface N is arranged in a right-angled triangle as a hypotenuse, and after two corresponding right-angled sides are obtained, the half angle of the actual valve sleeve inner conical surface cone angle alpha' can be converted, as shown in fig. 8, the length delta of the half angle opposite side 1 For measuring large circular diameter d 4 And small detection major diameter d 3 Half of the difference, half-angle adjacent side length delta 2 Detecting axial length L for detecting great circles 4 And detecting the axial length L of the small circle 5 Wherein L is 4 And L 5 The length detection of the measuring tool is that two ends of the measuring tool are respectively arranged in the valve sleeve V, and the length of the measuring tool measuring the small circular end surface and the transfer reference surface e is L when the contact between the large circular end and the inner conical surface N of the valve sleeve is detected 4 Detection measured when detecting contact of the small round end with the inner conical surface N of the valve sleeveThe length of the detection large round end face and the transfer reference surface e is L 5 ；
The calculation equation of the taper angle alpha' of the inner conical surface of the actually machined valve sleeve is as follows:
in the formula: alpha' -is the actual machining inner conical surface cone angle;
δ 1 -is the half-angle edge length;
δ 2 -is the half-angle neighbor length;
d 3 to detect the measured value of the small circle diameter;
d 4 -detecting the measured value of the major circle diameter;
L 4 -detecting an actual value of axial length for detecting the great circle;
L 5 -detecting the measured axial length for the detection of the small circles;
the actual machining valve sleeve inner conical surface cone angle alpha ' is indirectly obtained through a measured value, the actually machined valve sleeve inner conical surface cone angle alpha ' can be expressed as a multivariate function of an actually measured value, and according to an error theory, an equation of the actually machined inner conical surface cone angle measurement error delta alpha ' is as follows:
in the formula: d is a radical of 3 * -detecting the true value of the small circle diameter;
d 4 * -detecting the true value of the diameter of the large circle;
L 4 * -detecting the true value of the axial length for detecting the great circle;
L 5 * -detecting the true value of the axial length for the detection of the small circles;
its linearized error transfer formula (higher order term):
in the formula: Δ d 3 Is d 3 The measurement error of (2);
Δd 4 -is d 4 The measurement error of (2);
ΔL 4 -is L 4 The measurement error of (2);
ΔL 5 -is L 5 The measurement error of (2);
the transfer coefficients of the above errors are:
the diameter d of the large circle can be detected by the error transfer coefficients 4 And detecting the diameter d of the small circle 3 The larger the difference value is, the smaller the measuring error delta alpha' of the cone angle of the inner cone surface is;
5) The grinding amount detection device is adopted to detect the grinding amount of the inner conical surface of the valve sleeve in the production process
As shown in fig. 6, the basic structure and technical requirements of the grinding amount detecting device are the same as those of the angle detecting gauge, only the diameter of the detection circle is different, and the grinding amount detecting device can be set to be single-head or double-head to detect the diameter d of the sealing circle 5 Diameter d of sealing outer circle 1 Diameter of contact seal circle D 1 In a consistent manner, in view of the clearance between the inner hole of the valve sleeve V and the excircle of the checking fixture, in order to eliminate the clearance influence and improve the detection precision, a soft interference floating support mode is adopted, as shown in fig. 7, the rubber ring tensioning sleeve for floating supportThe rubber rings are arranged on the supporting circle, the number of the rubber rings is more than or equal to 2, the sleeved rubber rings and the matched inner hole of the valve sleeve N are in an interference state, and the interference magnitude mu value of the floating support is 0.1-0.2 mm; the retainer ring is open, a gap is kept between the periphery of the retainer ring and the excircle of the checking fixture after the retainer ring is sleeved, and the gap value epsilon of the retainer ring is 0.2-0.3 mm;
for detecting the axial grinding amount of the sealing circle, as shown in fig. 9, the measuring tool is placed in the valve housing V, and the dimension L between the transfer reference surface e before grinding and the outer end surface of the measuring tool is measured a That is, the axial position dimension of the sealing circle before grinding, after grinding the inner conical surface N of the valve sleeve, the dimension L between the transfer reference surface e and the outer end surface of the checking fixture is detected b I.e. axial position dimension of the sealing circle after grinding, L a And L b The difference value is the actual axial grinding amount of the sealing circle;
in the machining process of the valve sleeve V, the precision of the taper angle alpha of the inner conical surface of the valve sleeve is ensured by a machine tool, but the axial dimension of the contact sealing circle on the inner conical surface N of the valve sleeve relative to the transfer reference surface e is indirectly obtained and is influenced by a plurality of factors, so that after the valve sleeve is subjected to heat treatment, the axial position dimension L of the sealing circle before grinding is detected a Grading is carried out, the transfer datum plane e is used as an axial positioning datum during grinding, and grinding is adjusted in batches according to the grade, so that the grinding wheel impact caused by large grinding deviation and the final influence on the processing quality and the production efficiency due to large axial size difference of the valve sleeve inner conical surface N relative to the transfer datum plane e can be avoided;
6) Correcting trial grinding piece
Detecting axial position dimension L of ground sealing circle after trial grinding of valve sleeve b Calculating the actual value of the axial grinding amount, detecting the relevant parameters of the cone angle of the inner conical surface of the valve sleeve of the trial grinding part according to the method, converting the cone angle alpha 'of the actually machined valve sleeve according to the formula (10), confirming that the value is in the tolerance range of theoretical design, simultaneously calculating the corresponding actual deviation angle, correspondingly substituting the actual deviation angle for the maximum value and the minimum value of the axial grinding amount of the actual deviation angle at the sealing circle according to the fact that the cone angle alpha' of the inner conical surface of the valve sleeve is in upper deviation or lower deviation, and substituting the actual deviation angle for the formula (6) or the formula (7), the formula (8) or the formula (9), and detecting and calculatingThe actual value of the axial grinding amount is required to fall within the range of the maximum value and the minimum value, and the trial grinding piece is a qualified product; if the actual axial grinding amount value of the trial grinding piece does not fall within the range, and the actual taper angle of the inner conical surface of the valve sleeve is within the precision design range and approaches the ideal value, only the difference value needs to be calculated at the moment to readjust the feeding amount, and the angle of the grinding wheel does not need to be trimmed again; if the actual taper angle of the inner conical surface of the valve sleeve approaches the upper and lower deviation values or exceeds the deviation, the dressing angle of the grinding wheel can be adjusted again, and the detection process is repeated after trial grinding is performed again until all sizes are qualified;
because the angle detection gauge and the grinding amount detection device are based on the same detection device, the calculated difference value can effectively avoid the system error of the detection device.
In the subsequent processing process, when the self precision of the taper angle alpha of the inner conical surface of the valve sleeve is not required to be improved, once the dressing angle of the grinding wheel is determined, the dressing angle is not required to be adjusted and modified, and the precision requirement of the whole inner conical surface grinding processing process can be controlled only by timely detecting the axial grinding quantity of the actual sealing circle; in order to further improve the detection precision of the taper angle of the inner conical surface of the valve sleeve, the trial grinding part is detected by a three-coordinate measuring instrument under the condition that the condition allows, the detection value of the three-coordinate measuring instrument is compared with the detection value of the detection method of the device, and the measurement error of the detection method is calibrated; and an inner conical surface cone angle sample piece with a standard angle can also be manufactured, and the detection method is calibrated.
Claims (10)
1. The manufacturing control method of the taper angle of the inner conical surface of the valve sleeve of the thread plug-in overflow valve is characterized by comprising the following specific steps of:
1) Determining factors influencing the accuracy of the taper angle of the internal taper of the valve sleeve
Because the matching excircle of the valve core is in clearance fit with the matching inner hole of the valve sleeve, and the sealing line at the left end of the valve core is in contact sealing with the inner conical surface of the valve sleeve, the requirement on the accuracy of the runout quantity of the valve sleeve relative to the matching inner hole is limited, and particularly the runout quantity of the matching inner hole at the position of the contact sealing circle on the inner conical surface of the valve sleeve; meanwhile, when the cone valve is in a closed state, the inner cone surface of the valve sleeve bears high-pressure static load of the valve core, but the cone valve is closed after unloading to generate impact instantly, so that the requirements on the inner cone surface of the valve sleeve are that the characteristics of wear resistance, pressure resistance and impact resistance are met simultaneously to achieve the pre-designed service life, and after comprehensive analysis, the main influence factors influencing the cone angle precision of the inner cone surface of the valve sleeve are determined to be sealing performance and the service life based on a specific process;
2) Construction of valve sleeve inner conical surface cone angle deviation model based on process requirements
Based on the factors influencing the taper angle precision of the valve sleeve inner conical surface in the step 1), the design basic parameter items of the valve sleeve inner conical surface taper angle are large and small circles and taper angles at two ends of the valve sleeve inner conical surface, wherein the large circle diameter is the large circle diameter of the conical surface, the small circle diameter is the oil inlet drift diameter, and the taper angle is the valve sleeve inner conical surface taper angle; establishing a cone angle deviation model of the inner conical surface of the valve sleeve by taking a theoretically designed bus of the inner conical surface of the valve sleeve as a central position, wherein a deviation angle boundary line rotates by using the central point of the bus, the intersection point of an extension line of the deviation angle boundary line and a plane where a conical surface great circle is located does not exceed the range limited by the maximum normal grinding amount, and the intersection point of the extension line of the deviation angle boundary line and a cylindrical surface where an oil inlet drift diameter is located does not exceed the range limited by the maximum normal grinding amount; accordingly, the upper deviation angle is obtained according to the upper limit position endpoint and the central point, and the lower deviation angle is obtained according to the lower limit position endpoint and the central point;
3) Model for verifying taper angle deviation of inner conical surface of valve sleeve
The factors determining the upper deviation angle and the lower deviation angle comprise a conical surface large circle, an oil inlet drift diameter, the maximum normal grinding amount and the valve sleeve inner conical surface cone angle, the upper deviation angle value and the lower deviation angle value are calculated by setting calculation parameters, the upper deviation angle and the lower deviation angle value are further restricted by combining the inner circle grinding processing capacity and other factors to the precision requirement of the valve sleeve inner conical surface cone angle, and finally the design precision is determined;
according to the finally determined up-down deviation precision requirement, the axial grinding amount of the sealing circle changes along with the changes of the up-deviation angle and the down-deviation angle, and a maximum grinding amount calculation equation (6) when the taper angle of the inner conical surface of the valve sleeve is in the up-deviation state and a maximum grinding amount calculation equation (7) when the taper angle of the inner conical surface of the valve sleeve is in the down-deviation state are obtained through calculation:
maximum grinding quantity lambda 'in upper deviation' 2max The calculation equation of (2):
in the formula: lambda' 2max -is the maximum grinding amount in axial direction of the deviated sealing circle on the cone angle of the inner conical surface;
beta' -is the actual value of the upper deviation angle;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
delta B-is [ (D) i -D 1 )/2]+[ζ 1 /2cos(α/2)]；
Δ C-is [ (D) i -D 1 )/2]-[ζ 1 /2cos(α/2)]；
Maximum grinding amount lambda' at lower deviation 2max The calculation equation of (2):
in the formula: λ ″') 2max -is the axial maximum grinding amount of the deviated sealing circle under the cone angle of the inner conical surface;
theta' -is the actual value of the lower deviation angle;
ζ 1 -is the maximum normal grinding amount;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
Δ D-is (D) 1 -D p )/2；
When the taper angle of the inner conical surface of the valve sleeve is an ideal design value, the minimum axial grinding amount of the sealing circle can approach to zero, but the taper angle of the inner conical surface of the actual valve sleeve has deviation, and in order to ensure the grinding integrity of the inner conical surface of the whole valve sleeve, the minimum axial grinding amount of the sealing circle of the deviation value is required to be correspondingly limited in the actual deviation state of the taper angle of the inner conical surface of the valve sleeve; and obtaining a minimum grinding amount calculation equation (8) when the taper angle of the valve sleeve inner conical surface is in an upper deviation state and a minimum grinding amount calculation equation (9) when the taper angle of the valve sleeve inner conical surface is in a lower deviation state after calculation:
minimum grinding stock lambda 'in upper deviation' 2min The calculation equation of (2):
in the formula: lambda' 2min -is the minimum grinding amount in axial direction of the deviated sealing circle on the cone angle of the inner conical surface;
beta' -is the actual value of the upper deviation angle;
alpha-is the inner conical surface cone angle designed by the valve sleeve theory;
Δ D-is (D) 1 -D p )/2；
Minimum grinding amount lambda' in case of lower deviation 2min The calculation equation of (2):
in the formula: lambda ″', and 2min -is the axial minimum grinding amount of the deviated sealing circle under the cone angle of the inner conical surface;
theta' -is the actual value of the lower deviation angle;
ζ 1 -maximum normal grinding amount;
alpha-is the inner conical surface cone angle of the valve sleeve theoretical design;
Δ C-is [ (D) i -D 1 )/2]-[ζ 1 /2cos(α/2)]；
Taking the set data as a quantitative analysis basis, and respectively substituting the data into an equation (6), an equation (7), an equation (8) and an equation (9) to obtain a characteristic diagram of the axial grinding quantity deviation and tolerance variation trend of the seal circle; the change of the factor value difference is small, and each curve is approximately linearly changed on the whole;
4) Designing the taper angle of the inner conical surface of the valve sleeve by using the taper angle deviation model of the inner conical surface of the valve sleeve verified in the step 3), and detecting the inner conical surface of the valve sleeve in the production process by using an angle detection detector
The angle detection gauge comprises a gauge main body, a gauge excircle in clearance fit with a fit inner hole, a ring groove for floating support, a detection great circle and a detection small circle, wherein the detection great circle and the detection small circle are used for measuring the inner conical surface of a valve sleeve; the detection large circle and the detection small circle respectively form a contact acute angle with the end face of the detection tool body;
arranging a valve sleeve inner conical surface bus as a bevel edge in a right triangle, converting a half angle of an actual valve sleeve inner conical surface cone angle after acquiring two corresponding right-angle edges, wherein the length of the half angle opposite edge is half of the difference value between the detected large circular diameter and the detected small circular diameter, and the length of the adjacent edge of the half angle is the difference value between the detected large circular axial length and the detected small circular axial length;
the calculation equation of the taper angle of the inner conical surface of the actually processed valve sleeve is as follows:
in the formula: alpha' -is the actual machining inner conical surface cone angle;
δ 1 -is the half-angle edge length;
δ 2 -is the half-angle neighbor length;
d 3 -detecting the measured value of the small circle diameter;
d 4 -detecting the measured value of the major circle diameter;
L 4 -detecting an actual value of axial length for detecting the great circle;
L 5 -detecting the measured axial length for the detection of the small circles;
the actual machining valve sleeve inner conical surface cone angle alpha ' is indirectly obtained through a measured value, the actually machined valve sleeve inner conical surface cone angle alpha ' can be expressed as a multivariate function of an actually measured value, and according to an error theory, an equation of the actually machined inner conical surface cone angle measurement error delta alpha ' is as follows:
in the formula: d 3 * -for detecting the true value of the small circle diameter;
d 4 * -detecting the true value of the major circle diameter;
L 4 * -detecting the true value of the axial length for detecting the great circle;
L 5 * -detecting the real value of the axial length for detecting the small circles;
its linearized error transfer formula (higher order term):
in the formula: Δ d 3 Is d 3 The measurement error of (2);
Δd 4 is d 4 The measurement error of (2);
ΔL 4 -is L 4 The measurement error of (2);
ΔL 5 -is L 5 The measurement error of (2);
the transfer coefficients of the above errors are:
the larger the difference between the diameter of the detected large circle and the diameter of the detected small circle can be obtained by the error transfer coefficients, the smaller the measurement error of the cone angle of the inner cone is;
5) The grinding amount detection device is adopted to detect the grinding amount of the inner conical surface of the valve sleeve in the production process
The basic structure and technical requirements of the grinding quantity detection device are the same as those of an angle detection gauge, and only the diameter of a detection circle is different; detecting the axial grinding quantity of the sealing circle, namely placing a detection tool into a valve sleeve, firstly measuring the size between a transfer reference surface before grinding and the outer end surface of the detection tool, and after grinding the inner conical surface of the valve sleeve, detecting the size between the transfer reference surface and the outer end surface of the detection tool, wherein the difference value of the two sizes is the actual axial grinding quantity of the sealing circle;
6) Correcting trial grinding piece
Detecting the axial position size of a ground sealing circle after the trial grinding of the valve sleeve, calculating an actual value of axial grinding amount, detecting relevant parameters of the cone angle of the inner conical surface of the valve sleeve of the trial grinding part according to the method, converting the cone angle of the inner conical surface of the actually machined valve sleeve according to the formula (10), confirming that the value is in a theoretically designed tolerance range, simultaneously calculating a corresponding actual deviation angle, correspondingly substituting the actual deviation angle into the formula (6) or the formula (7), the formula (8) or the formula (9) according to the fact that the cone angle of the inner conical surface of the valve sleeve is in an upper deviation or a lower deviation, converting the maximum value and the minimum value of the axial grinding amount of the sealing circle corresponding to the actual deviation angle, wherein the calculated actual value of the axial grinding amount falls in the range of the maximum value and the minimum value, and the trial grinding part is a qualified product; if the actual axial grinding amount value of the trial grinding piece does not fall within the range, and the actual taper angle of the inner conical surface of the valve sleeve is within the precision design range and approaches the ideal value, only the difference value needs to be calculated at the moment to readjust the feeding amount, and the angle of the grinding wheel does not need to be trimmed again; if the actual taper angle of the inner conical surface of the valve sleeve approaches the upper and lower deviation values or exceeds the deviation value, the dressing angle of the grinding wheel is adjusted again, and the detection process is repeated after trial grinding until all sizes are qualified;
because the angle detection gauge and the grinding amount detection device are based on the same detection device, the calculated difference value can effectively avoid the system error of the detection device.
2. The method for controlling the manufacturing of the taper angle of the inner conical surface of the valve sleeve of the thread cartridge type relief valve according to claim 1, wherein the accuracy of the shape of the contact seal circle in step 1) is 5 to 6.
3. The method for controlling the manufacturing of the taper angle of the inner conical surface of the valve sleeve of the thread cartridge overflow valve according to claim 1, wherein in the step 1), the valve sleeve is made of a high-strength hardened and tempered material.
4. The method for controlling the taper angle of the inner conical surface of the valve sleeve of the thread insert type relief valve according to claim 3, wherein a grinding allowance is left in the machining of the valve sleeve, then carbonitriding heat treatment is carried out, and then grinding finish machining is carried out on the portion with the allowance after the heat treatment, but the carbonitriding layer is shallow, so that the maximum normal grinding amount of the inner conical surface carburized layer of the valve sleeve is controlled within 0.1mm to obtain high surface hardness, namely the maximum grinding amount at both ends is not more than 0.1mm when the lower deviation angle and the upper deviation angle reach the limit positions.
5. The manufacturing control method for the taper angle of the inner conical surface of the valve sleeve of the thread cartridge type relief valve according to claim 1, wherein in the step 3), the calculation equation of the upper deviation angle β is as follows:
calculation equation of lower deviation angle θ:
in the formula: beta-is an upper deviation angle;
theta-is the lower deviation angle;
alpha-is the inner conical surface cone angle of the valve sleeve theoretical design;
ζ 1 -maximum normal grinding amount;
delta A-is a large cone D i And oil inlet diameter D p A difference of (d);
through the above calculation, the design accuracy can be finally determined to be ± 1 °.
6. The manufacturing control method for the taper angle of the inner conical surface of the valve sleeve of the thread cartridge overflow valve according to claim 1, wherein in the step 4), process holes are formed in two ends of the main body of the checking fixture along the rotation center; simultaneously, the checking fixture main body, the checking fixture excircle, the annular groove, the detection great circle and the detection small circle are of a coaxial structure.
7. The method for manufacturing and controlling the taper angle of the inner conical surface of the valve sleeve of the thread cartridge overflow valve according to claim 6, wherein the angle detection gauge comprises the following processing flows: the method comprises the following steps of carrying out high-hardness treatment after machining of a gauge main body, grinding a process hole in advance after heat treatment, finely grinding the outer circle of the gauge, an annular groove support circle, a detection large circle, a detection small circle and end faces at two ends after grinding to ensure the coaxiality of the outer circle of the fine machining and the verticality of the end faces at the two ends relative to the detection large circle and the detection small circle, keeping a sharp edge of a contact acute angle after fine machining, and limiting the length of the gauge to enable the detection large circle end to exceed the end face of a valve sleeve by 5-6 mm when the detection small circle end is placed into an inner conical surface of the valve sleeve.
8. The method for controlling the taper angle of the inner conical surface of the valve sleeve of the thread insert type relief valve according to claim 7, wherein after the heat treatment of the valve sleeve, the dimension between the transfer reference surface before grinding and the outer end surface of the checking tool is firstly graded, and the grinding is adjusted in batches according to the grade by using the transfer reference surface as an axial positioning reference during grinding.
9. The method for controlling the manufacturing of the taper angle of the inner conical surface of the valve sleeve of the thread insertion overflow valve according to claim 1, wherein in view of the clearance between the matching inner hole of the valve sleeve and the outer circle of the checking fixture, in order to eliminate the clearance influence and improve the detection precision, a soft interference floating support mode is adopted, rubber rings for floating support are tightly sleeved on a support circle, and the number of the rubber rings is more than or equal to 2.
10. The manufacturing control method for the taper angle of the inner conical surface of the valve sleeve of the threaded plug-in type overflow valve according to claim 9, characterized in that the sleeved rubber ring and the matched inner hole of the valve sleeve are in an interference state, and the value of the interference of floating support is 0.1-0.2 mm; the retainer ring is of an open structure, a gap is kept between the periphery of the retainer ring and the excircle of the checking fixture after the retainer ring is sleeved, and the gap value of the retainer ring is 0.2-0.3 mm.
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