CN110774113A - Processing technology of embedded chromium-plated high-strength adjusting shaft - Google Patents
Processing technology of embedded chromium-plated high-strength adjusting shaft Download PDFInfo
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- CN110774113A CN110774113A CN201911013766.2A CN201911013766A CN110774113A CN 110774113 A CN110774113 A CN 110774113A CN 201911013766 A CN201911013766 A CN 201911013766A CN 110774113 A CN110774113 A CN 110774113A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
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Abstract
The invention discloses a processing technology of an embedded chromium-plated high-strength adjusting shaft, which comprises the steps of turning a groove on the excircle of a semi-finished product of the high-strength adjusting shaft, grinding the groove, carrying out chromium plating on the groove, forming a chromium plating layer on the groove of the high-strength adjusting shaft, carrying out local grinding on the joint between the two ends of the chromium plating layer on the groove and a base body of the high-strength adjusting shaft, and then carrying out integral pressure grinding on the whole excircle surface of the high-strength adjusting shaft. The invention has the characteristics of improving the processing quality of the chromium coating of the high-strength adjusting shaft, realizing the seamless connection between the chromium coating area and the matrix area, tightly combining the matrix and the film layer on the working surface of the part into a whole, improving the binding force and the hydrogen embrittlement resistance of the chromium coating, reducing the defects of cracks and bubbles caused by chromium coating deposition, and the defects of appearance defect, block falling and the like of the adjusting shaft caused by hard and brittle chromium coating and easy falling off, effectively improving the one-time submission qualification rate of chromium coating processing and the processing quality of the chromium coating, and prolonging the service life of the high-strength adjusting shaft.
Description
Technical Field
The invention relates to the processing of all high-strength chromium-plated parts of various products (military products, civil products, foreign trade products and the like), in particular to a processing technology of an embedded chromium-plated high-strength adjusting shaft in an aviation ratchet wheel brake system.
Background
At present for the aviation high strength adjustment axle for improving working face hardness, guarantee its wearability, corrosion resistance, generally adopt chromium plating technology at the working face, but chromium-plated layer directly adheres to the bright and clean excircle surface of steel spare, easily produce defects such as crackle, bubble when the chromium plating deposit, and hard chromium layer is hard and fragile to fall off and causes the adjustment axle outward appearance to lack the piece, fall defects such as piece, reduced adjustment axle one-time processing qualification rate by a wide margin, cause the problem of doing over again repeatedly, can't satisfy the demand that big batch product order was delivered, very big influence the delivery node of product.
Disclosure of Invention
The invention aims to provide a chromium plating processing method of an embedded high-strength adjusting shaft. The invention has the characteristics of improving the processing quality of the chromium coating of the high-strength adjusting shaft, realizing the seamless connection between a chromium coating area and a matrix area by improving a process method, tightly combining the matrix and the film layer on the working surface of a part into a whole, improving the binding force and the hydrogen embrittlement resistance of the chromium coating, reducing the defects of cracks and bubbles caused by chromium coating deposition, and the defects of appearance defect, block falling and the like of the adjusting shaft caused by hard and brittle chromium coating and easy falling, effectively improving the one-time submission qualification rate of chromium coating processing and the processing quality of the chromium coating, and prolonging the service life of the high-strength adjusting shaft.
The technical scheme of the invention is as follows: a processing technology of an embedded chromium-plated high-strength adjusting shaft comprises the steps of turning a groove on the outer circle of a semi-finished product of the high-strength adjusting shaft, carrying out chromium plating on the groove after grinding the groove, forming a chromium plating layer on the groove of the high-strength adjusting shaft, carrying out local grinding on joints of two ends of the chromium plating layer on the groove and a high-strength adjusting shaft base body, and then carrying out integral pressure grinding on the whole outer circle surface of the high-strength adjusting shaft.
The machining process of the embedded chromium-plated high-strength adjusting shaft specifically comprises the following steps of:
A. after quenching and tempering are carried out on the blank material of the part, a semi-finished product of the high-strength adjusting shaft is obtained by processing;
B. turning a groove on the chrome plating area of the semi-finished product of the high-strength adjusting shaft by using a numerical control lathe;
C. grinding the groove on the semi-finished product of the high-strength adjusting shaft by using a centerless grinding machine; the centerless grinding machine comprises a grinding machine support, a grinding wheel and a guide wheel, wherein a first boss is arranged on the grinding machine support, and second bosses are arranged on the grinding wheel and the guide wheel;
D. performing chromium plating on the groove on the high-strength adjusting shaft to form a chromium plating layer on the groove of the high-strength adjusting shaft;
E. and locally grinding the joint between the two ends of the chromium coating on the groove and the high-strength adjusting shaft base body by using an external grinding machine, then performing press grinding on the whole external circular surface of the high-strength adjusting shaft by using a centerless grinding machine, and polishing by a bench worker to obtain a finished product.
In the step C, specifically, the semi-finished product of the high-strength adjustment shaft is placed on the inclined plane of the grinding machine support, so that the groove is placed on the first boss of the grinding machine support, a grinding wheel and a guide wheel are arranged on two sides of the semi-finished product of the high-strength adjustment shaft, the second bosses on the grinding wheel and the guide wheel are aligned with the initial position of the groove, and the groove of the semi-finished product of the high-strength adjustment shaft on the inclined plane of the grinding machine support is subjected to pressure grinding and grinding through rotation of the grinding wheel and the guide wheel.
In the processing technology of the embedded chromium-plated high-strength adjusting shaft, in the step C, after the centerless grinder is used for grinding the groove on the semi-finished product of the high-strength adjusting shaft, the widths of the groove, the first boss on the grinder support, the grinding wheel and the second boss on the guide wheel are the same, and an arc transition surface R1 is formed at the joint of the groove and the high-strength adjusting shaft base body.
In the processing technology of the embedded chromium-plated high-strength adjusting shaft, in the step D, the chromium plating layer on the groove of the high-strength adjusting shaft is 0.05-0.1mm higher than the outer surface of the high-strength adjusting shaft base body at the two ends of the groove.
In the foregoing processing technology of the embedded chromium-plated high-strength adjustment shaft, in the step E, bench polishing is performed on two transition surfaces, i.e., R2 and R3, on the high-strength adjustment shaft.
In the processing technology of the embedded chromium plating high-strength adjusting shaft, the outer diameter of the groove before chromium plating is dm +/- β m, dm is the nominal size of the outer diameter of the groove before chromium plating, and β m is the median tolerance of the outer diameter of the groove before chromium plating.
In the processing technology of the embedded chromium plating high-strength adjusting shaft, a calculation formula of the nominal size dm of the outer diameter of the groove before chromium plating is as follows:
nominal dimension d of finished product outside diameter = (maximum dimension dmax of finished product outside diameter + minimum dimension dmin of finished product outside diameter)/2;
the average value delta = (maximum value delta max of the film thickness of the finished chromium coating and minimum value delta min of the film thickness of the finished chromium coating)/2 of the film thickness of the finished single-side chromium coating;
and the nominal size dm of the outer diameter of the groove before chrome plating = the nominal size d of the outer diameter of the finished product-the average value delta x 2 of the film thickness of the single-side chrome plating layer of the finished product + the grinding allowance theta x 2.
In the foregoing processing technology of the embedded chromium plating high-strength adjusting shaft, the calculation formula of the median β m of the tolerance of the outer diameter of the groove before chromium plating is as follows:
the finished product outside diameter tolerance median value β = (finished product outside diameter maximum dimension dmax-finished product outside diameter minimum dimension dmin)/2;
the median value β m of the tolerance of the outer diameter of the groove before chrome plating is less than or equal to the median value β of the tolerance of the outer diameter of the finished product.
Compared with the prior art, the invention has the following beneficial effects:
the invention has the characteristics of improving the processing quality of the chromium coating of the high-strength adjusting shaft, realizing the seamless connection between the chromium coating area and the matrix area by optimizing and improving the process method, tightly combining the matrix and the film layer on the working surface of the part into a whole, improving the binding force and the hydrogen embrittlement resistance of the chromium coating, reducing the defects of cracks and bubbles caused by chromium coating deposition, and the defects of appearance defect, block falling and the like of the adjusting shaft caused by hard and brittle chromium coating and easy falling, effectively improving the one-time submission qualification rate of chromium coating processing and the processing quality of the chromium coating, and prolonging the service life of the high-strength adjusting shaft.
The test proves that:
the inventor carries out the following tests on the embedded chromium-plated high-strength adjusting shaft prepared in the embodiment, and the results are as follows:
1. and (3) testing the binding force of the plating layer: in the prior art, in the deposition process of a chromium plating layer, the grain type nucleation and growth process of the chromium plating layer is slow, so that chromium grains on the surface of a base material are uneven in size and loose in distribution, therefore, along with the progress of the chromium plating deposition process, the thickness of the chromium plating layer is increased along with the extension of the deposition time of the chromium plating layer at the cross section of an outer round edge, a penetrating crack defect is easy to form, the phenomena of block missing and block dropping can not be repaired after chromium plating grinding, and only the chromium plating layer can be removed and reworked; after the technology is innovatively improved, the processing technology of the embedded chromium plating high-strength adjusting shaft is used, so that the chromium plating layer boundary of the excircle of a part is clearer, obvious defects are not found due to tight combination, the formed chromium plating layer is more uniform, the part after grinding finds that the chromium plating layer and a substrate are tightly combined on a bottom layer, the bending test of a knife scraping or embedded chromium plating high-strength adjusting shaft is qualified, and when the part is inspected by using a 4-time magnifier, the separation of the chromium plating layer and an electroplating intermediate layer is not shown, and the separation of the chromium plating layer and a matrix technology is not shown; the chromium-plated part can be ground to the size specified in the drawing, and obvious bubbles and peeling are not generated after grinding.
2. Hydrogen embrittlement test: in the prior art, at the initial stage of chromium deposition, formed chromium hydride is mainly chromium hydride of hexagonal crystal chromium, however, the crystal structure is in a stable and unstable state, when the crystal size reaches a certain critical size, the crystal structure is spontaneously converted from a hexagonal structure into a more stable body-centered cubic structure, the change between the crystal structures is accompanied with the change of the volume, the volume is reduced to generate huge tensile stress, meanwhile, unstable chromium hydride is decomposed to generate hydrogen, when chromium does not completely cover and collect base metal, the base metal absorbs the hydrogen atoms, internal stress is generated inside the base metal, when the internal stress of a plating layer exceeds the strength limit of the plating layer, the plating layer is cracked, and hydrogen embrittlement fracture occurs. The processing technology of the embedded chromium plating high-strength adjusting shaft limits the change of the volume and reduces the generation of tensile stress in the matrix, the strength of the embedded chromium plating high-strength adjusting shaft is measured to be improved from 1172Mpa to 1255Mpa of the matrix after a dehydrogenation test, when the chromium plating layer is finished to be bright lines, the lowest section hardness is improved from HRC37-42min of the matrix hardness to HRC65.5min, and the surface roughness is improved from Ra0.4 to Ra0.2 of the matrix hardness; the appearance surface has no cracks, bubbles and peeling phenomena.
3. And (3) fatigue strength test: the effective working time of the embedded chromium-plated high-strength adjusting shaft is 800 hours, while the effective working time of the chromium-plated high-strength adjusting shaft produced by the prior art is 412 hours, and the original effective working time is prolonged from 412 hours to 800 hours, so that the service life of the adjusting shaft is greatly prolonged.
4. In addition, the method has the advantages of simple and easy operation, good coating quality, small probability of coating block missing and block falling after grinding, less repair, and greatly improves the one-time submission qualification rate of products and the service life of the products to greater economic benefit, wherein the one-time submission qualification rate is improved to 95% compared with the one-time submission qualification rate before improvement by 50%.
In conclusion, the invention has the characteristics of improving the processing quality of the chromium coating of the high-strength adjusting shaft, realizes the seamless connection between the chromium coating area and the base area by optimizing and improving the process method, leads the base and the film layer on the working surface of the part to be tightly combined into a whole, improves the binding force and the hydrogen embrittlement resistance of the chromium coating, reduces the defects of cracks and bubbles caused by chromium coating deposition, and the defects of appearance defect, block falling and the like of the adjusting shaft caused by hard and brittle chromium coating and easy falling off, effectively improves the one-time submission qualification rate of chromium coating processing and the processing quality of the chromium coating, and prolongs the service life of the high-strength adjusting shaft.
Drawings
FIG. 1 is a schematic structural view of a finished high-strength adjusting shaft, a groove and a chromium coating according to the present invention;
FIG. 2 is a schematic structural diagram of the high-strength adjusting shaft before chrome plating of the groove;
FIG. 3 is a schematic diagram of the present invention in which a centerless grinder is used to grind a groove on a high-strength adjustment shaft;
FIG. 4 is a schematic diagram of the structure of a grinder carriage in the centerless grinder of FIG. 3;
FIG. 5 is a schematic view of the grinding wheel of the centerless grinder of FIG. 3;
FIG. 6 is a schematic view of the structure of the idler of the centerless grinder of FIG. 3;
FIG. 7 is a schematic view of a grinding wheel of a cylindrical grinder used for partially grinding the joint between the two ends of the chromium coating on the groove and the high-strength adjusting shaft base body;
fig. 8 is a schematic view of the grinding wheel of the centerless grinding machine for pressing and grinding the entire outer circle of the high-strength adjusting shaft.
The labels in the figures are: 1-high-strength adjusting shaft, 2-grinding machine support, 3-grinding wheel, 4-guide wheel, 5-groove, 6-chromium coating, 7-first boss, 8-second boss, 9-grinding wheel on cylindrical grinding machine, and 10-grinding wheel on centerless grinding machine.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Examples are given. A processing technology of an embedded chromium plating high-strength adjusting shaft is shown in figures 1-8 and specifically comprises the following steps:
A. after quenching and tempering are carried out on the blank material of the part, a semi-finished product of the high-strength adjusting shaft (1) is obtained by processing;
B. turning a groove (5) on a chrome plating area of the semi-finished product of the high-strength adjusting shaft (1) by a numerically controlled lathe on the semi-finished product of the high-strength adjusting shaft (1), wherein the outline of the groove (5) is 0.1mm lower than the excircle of a matrix of the semi-finished product of the high-strength adjusting shaft (1);
C. as shown in fig. 3-6, grinding the groove (5) on the semi-finished product of the high-strength adjusting shaft (1) by using a centerless grinder; specifically, a semi-finished product of a high-strength adjusting shaft (1) is placed on an inclined plane of a grinding machine support (2), a groove (5) is placed on a first boss (7) of the grinding machine support (2), a grinding wheel (3) and a guide wheel (4) are arranged on two sides of the semi-finished product of the high-strength adjusting shaft (1), second bosses (8) on the grinding wheel (3) and the guide wheel (4) are aligned with the initial positions of the groove (5), and the groove (5) of the semi-finished product of the high-strength adjusting shaft (1) on the inclined plane of the grinding machine support (2) is subjected to press grinding and grinding through rotation of the grinding wheel (3) and the guide wheel (4); after a groove (5) in the semi-finished product of the high-strength adjusting shaft (1) is ground by a centerless grinder, the widths of the groove (5), a first boss (7) on a grinder bracket (2), a grinding wheel 3 and a second boss (8) on a guide wheel 4 are the same, namely L1= L2= L3, a transition surface R1 is formed at the joint of the groove (5) and two ends of a base body of the high-strength adjusting shaft (1), and the size of R1 is R0.8 +/-0.2 mm;
D. performing chromium plating on the groove (5) on the high-strength adjusting shaft (1), and forming a chromium plating layer (6) on the groove (5) of the high-strength adjusting shaft (1); the chromium coating (6) on the groove (5) of the high-strength adjusting shaft (1) is 0.05-0.1mm higher than the outer surface of the substrate of the high-strength adjusting shaft (1) at the two ends of the groove (5);
E. as shown in fig. 7-8, grinding wheels (9) on the cylindrical grinding machine are used for locally grinding joints between two ends of the chromium coating (6) on the groove and the base body of the high-strength adjusting shaft (1), then grinding wheels (10) on the centerless grinding machine are used for pressing and grinding the whole excircle of the high-strength adjusting shaft (1), and then performing bench work polishing on transition surfaces of R2 and R3 on the high-strength adjusting shaft (1) to obtain a finished product; wherein the R2 size is R2.23 + -0.1mm, and the R3 size is R0.16 + -0.08 mm.
As shown in FIG. 2, the outer diameter of the groove (5) before chrome plating is dm +/- β m, dm is the nominal dimension of the outer diameter of the groove (5) before chrome plating, and β m is the median tolerance value of the outer diameter of the groove (5) before chrome plating.
The calculation formula of the nominal size dm of the outer diameter of the groove (5) before chrome plating is as follows:
nominal dimension d of finished product outside diameter = (maximum dimension dmax of finished product outside diameter + minimum dimension dmin of finished product outside diameter)/2;
the average value delta = (maximum value delta max of the film thickness of the finished chromium coating and minimum value delta min of the film thickness of the finished chromium coating)/2 of the film thickness of the finished single-side chromium coating;
and the nominal size dm of the outer diameter of the groove (5) before chrome plating = the nominal size d of the outer diameter of the finished product-the average value delta x 2 of the film thickness of the single-side chrome plating layer of the finished product + the grinding allowance theta x 2.
The calculation formula of the median β m of the tolerance of the outer diameter of the groove (5) before chrome plating is as follows:
the finished product outside diameter tolerance median value β = (finished product outside diameter maximum dimension dmax-finished product outside diameter minimum dimension dmin)/2;
the median value β m of the tolerance of the outer diameter of the groove (5) before chrome plating is less than or equal to the median value β of the tolerance of the outer diameter of the finished product.
In the embodiment, the final product size of the high-strength adjusting shaft is phi 6.25-6.29 mm, the single-side thickness of the designed coating is 0.1-0.15 mm, and the single-side grinding allowance of the process is =0.05 mm;
firstly, the nominal dimension dm of the outer diameter of the groove (5) before chrome plating is calculated as follows:
①, the maximum outer diameter dimension dmax =6.29mm and the minimum outer diameter dimension dmin =6.25 mm;
nominal dimension d of finished product outer diameter = (maximum dimension dmax of finished product outer diameter + minimum dimension dmin of finished product outer diameter)/2 =6.27 mm;
②, the maximum value delta max of the film thickness of the finished chromium coating =0.15mm, and the minimum value delta min of the film thickness of the finished chromium coating =0.1 mm;
the average value delta = (maximum value delta max of the film thickness of the finished chromium coating and minimum value delta min of the film thickness of the finished chromium coating)/2 =0.125mm of the film thickness of the finished single-side chromium coating;
③, grinding allowance theta is 0.05 mm;
before chrome plating, the nominal size dm of the outer diameter of the groove (5) is = the nominal size d of the outer diameter of a finished product-the average value delta x 2 of the film thickness of the single-side chrome plating layer of the finished product + the grinding allowance theta x 2=6.12 mm;
secondly, the median β m of the tolerance of the outer diameter of the groove (5) before chrome plating is calculated as follows:
①, a finished product outside diameter tolerance median value β = (finished product outside diameter maximum dimension dmax-finished product outside diameter minimum dimension dmin)/2 =0.02 mm;
②, the median value of the outer diameter tolerance of the groove (5) before chrome plating is β m and is less than or equal to the median value of the outer diameter tolerance of the finished product β, and the median value of the outer diameter tolerance of the groove (5) before chrome plating is β m = the median value of the outer diameter tolerance of the finished product β =0.02mm
Therefore, the external diameter dm +/- β m of the groove (5) before chrome plating is 6.12 +/-0.02 mm.
Claims (9)
1. A processing technology of an embedded chromium plating high-strength adjusting shaft is characterized in that: the method comprises the steps of turning a groove (5) on the excircle of a semi-finished high-strength adjusting shaft (1), carrying out chromium plating on the groove (5) after grinding the groove (5), forming a chromium plating layer (6) on the groove (5) of the high-strength adjusting shaft (1), carrying out local grinding on the joint of the two ends of the chromium plating layer (6) on the groove (5) and a base body of the high-strength adjusting shaft (1), and then carrying out integral pressure grinding on the whole excircle surface of the high-strength adjusting shaft (1).
2. The processing technology of the embedded chromium plating high-strength adjusting shaft according to claim 1, characterized in that: the method specifically comprises the following steps:
A. after quenching and tempering are carried out on the blank material of the part, a semi-finished product of the high-strength adjusting shaft (1) is obtained by processing;
B. turning a groove (5) on the chrome plating area of the semi-finished product of the high-strength adjusting shaft (1) by adopting a numerical control lathe;
C. grinding the groove (5) on the semi-finished product of the high-strength adjusting shaft (1) by using a centerless grinding machine; the centerless grinding machine comprises a grinding machine support (2), a grinding wheel (3) and a guide wheel (4), wherein a first boss (7) is arranged on the grinding machine support (2), and second bosses (8) are arranged on the grinding wheel (3) and the guide wheel (4);
D. performing chromium plating on the groove (5) on the high-strength adjusting shaft (1), and forming a chromium plating layer (6) on the groove (5) of the high-strength adjusting shaft (1);
E. and (3) locally grinding the joint between the two ends of the chromium coating (6) on the groove (6) and the base body of the high-strength adjusting shaft (1) by using an external grinding machine, then performing press grinding on the whole external circular surface of the high-strength adjusting shaft (1) by using a centerless grinding machine, and polishing by a fitter to obtain a finished product.
3. The processing technology of the embedded chromium plating high-strength adjusting shaft according to claim 2, characterized in that: and step C, specifically, placing the semi-finished product of the high-strength adjusting shaft (1) on the inclined plane of the grinding machine support (2), placing the groove (5) on a first boss (7) of the grinding machine support (2), arranging a grinding wheel (3) and a guide wheel (4) on two sides of the semi-finished product of the high-strength adjusting shaft (1), aligning second bosses (8) on the grinding wheel (3) and the guide wheel (4) with the initial positions of the groove (5), and performing press grinding and grinding on the groove (5) of the semi-finished product of the high-strength adjusting shaft (1) on the inclined plane of the grinding machine support (2) through rotation of the grinding wheel (3) and the guide wheel (4).
4. The machining process of the embedded chromium plating high-strength adjusting shaft according to claim 3, characterized in that: and in the step C, after the groove (5) on the semi-finished product of the high-strength adjusting shaft (1) is ground by using a centerless grinder, the widths of the groove (5), the first boss (7) on the grinder bracket (2), the grinding wheel (3) and the second boss (8) on the guide wheel (4) are the same, and an arc transition surface R1 is formed at the joint of the groove (5) and the base body of the high-strength adjusting shaft (1).
5. The processing technology of the embedded chromium plating high-strength adjusting shaft according to claim 2, characterized in that: in the step D, the chromium coating (6) on the groove (5) of the high-strength adjusting shaft (1) is 0.05-0.1mm higher than the outer surface of the base body of the high-strength adjusting shaft (1) at the two ends of the groove (5).
6. The processing technology of the embedded chromium plating high-strength adjusting shaft according to claim 2, characterized in that: and in the step E, the bench worker polishes the transition surfaces of R2 and R3 on the high-strength adjusting shaft (1).
7. The machining process of the embedded chromium plating high-strength adjusting shaft according to the claim 1 is characterized in that the outside diameter of the groove (5) before chromium plating is dm +/- β m, dm is the nominal size of the outside diameter of the groove (5) before chromium plating, and β m is the median tolerance of the outside diameter of the groove (5) before chromium plating.
8. The process for machining the embedded chromium-plated high-strength adjusting shaft according to claim 7, wherein the process comprises the following steps: the calculation formula of the nominal size dm of the outer diameter of the groove (5) before chrome plating is as follows:
nominal dimension d of finished product outside diameter = (maximum dimension dmax of finished product outside diameter + minimum dimension dmin of finished product outside diameter)/2;
the average value delta = (maximum value delta max of the film thickness of the finished chromium coating and minimum value delta min of the film thickness of the finished chromium coating)/2 of the film thickness of the finished single-side chromium coating;
and the nominal size dm of the outer diameter of the groove (5) before chrome plating = the nominal size d of the outer diameter of the finished product-the average value delta x 2 of the film thickness of the single-side chrome plating layer of the finished product + the grinding allowance theta x 2.
9. The machining process of the embedded chromium plating high-strength adjusting shaft as claimed in claim 7, wherein the calculation formula of the median value β m of the tolerance of the outer diameter of the groove (5) before chromium plating is as follows:
the finished product outside diameter tolerance median value β = (finished product outside diameter maximum dimension dmax-finished product outside diameter minimum dimension dmin)/2;
the median value β m of the tolerance of the outer diameter of the groove (5) before chrome plating is less than or equal to the median value β of the tolerance of the outer diameter of the finished product.
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