CN107350754B - Processing method of outer barrel with inclined annular groove - Google Patents
Processing method of outer barrel with inclined annular groove Download PDFInfo
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- CN107350754B CN107350754B CN201710815196.3A CN201710815196A CN107350754B CN 107350754 B CN107350754 B CN 107350754B CN 201710815196 A CN201710815196 A CN 201710815196A CN 107350754 B CN107350754 B CN 107350754B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/02—Undercarriages
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Abstract
The invention relates to a method for processing an outer cylinder with an inclined annular groove. The machining process comprises the steps of controlling machining processes such as equipment, a cutter, heat treatment and the like, ensuring environment safety and the like, utilizing turning and milling three-axis rough milling machining and five-axis semi-finish machining, after the part is subjected to heat treatment, adopting a numerical control turning and a numerical control grinding again, and obtaining the inclined annular groove outer cylinder with good quality by adopting a certain process strategy and adopting a reasonable clamping mode and strict grinding parameters.
Description
Technical Field
The invention relates to a method for machining an outer cylinder of an undercarriage, in particular to a method for machining an outer cylinder with a thin-wall inclined annular groove, and belongs to the field of machining.
Background
With the rapid development of the aviation industry in China, the requirement on the design performance of the airplane is higher and higher, and the technical requirement on mechanical processing is also innovated synchronously with the requirement, so that a more reliable and more efficient processing method is provided. Taking the outer barrel part of the landing gear with the inclined annular groove as an example, generally, the outer barrel comprises a body 1, the body 1 is provided with an inclined annular groove 2 which is not perpendicular to the central axis of the body 1, one end of the body close to the inclined annular groove 2 is provided with an inclined lug piece which extends towards the outer side of the body, the inclined lug piece is provided with an inclined lug piece hole 3, the other end of the body is provided with a torsion arm lug piece which is perpendicular to the inclined lug piece, the torsion arm lug piece is provided with a torsion arm hole 4, and the center of the inclined lug piece hole and the central axis of the inclined annular groove are. The part has a large overall dimension, the minimum wall thickness at the periphery of the inclined annular groove part is only 3.7 mm, the part belongs to a typical thin-wall cavity part, the part has poor structural rigidity and is easy to deform, the part is one of main bearing components of the aircraft landing gear, the landing gear folding and unfolding effect is realized, the part is a high-precision matching part, the requirements on size and position tolerance are strict, the part is a key part and is made of 30CrMnSiNi2A ultrahigh-strength steel, due to the increase of the difficulty of process design, one of the difficulties of the part is to solve the processing of the thin-wall inclined annular groove part, a model is provided for the processing of the structural part, the part can be widely applied to the mechanical processing industries of aerospace and the like, and has strong social and economic benefits. The outer cylinder rough blank for manufacturing the outer cylinder is generally a die forging.
The research on the machining process of the inclined shaft neck part of the part belongs to the first machining, and has no any tagging experience: firstly, a horizontal machining center is adopted to machine parts, the overhang of a main shaft must be larger than 800mm, and machine tool accessories cannot meet requirements and are unstable; secondly, a lathe and a grinding machine are adopted to process the parts, and due to the appearance structure of the parts, the alignment reference cannot be specified, and the size and the roughness cannot be guaranteed. Therefore, a new process and a new method are needed to break through the previous processing method. Firstly, adopting three-axis Cartesian coordinates (an X axis, a Y axis and a Z axis) and five axes (the X axis, the Y axis, the Z axis, the C axis and the B axis) to compile a numerical control three-axis program and a five-axis program, and then utilizing a turning and milling machining center to finish rough machining and semi-finish machining of parts; after the parts are subjected to heat treatment, a reasonable clamping mode and strict grinding parameters are controlled on the parts by using a numerical control lathe and a numerical control grinding machine, a reasonable process flow is formulated, and the quality of the product and various design requirements of the product are ensured.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to: the machining method for the outer barrel with the thin-wall inclined annular groove is provided, so that the problems of safety and quality in the machining process of parts with the thin-wall inclined annular groove are solved, and the machining efficiency of the parts can be improved.
In order to solve the technical problems, the technical scheme of the invention is as follows: the processing method of the outer barrel with the inclined annular groove is formed by processing an outer barrel rough blank, the outer barrel rough blank comprises a body, one end of the body is provided with an inclined lug rough blank, and the other end of the body is provided with a torsion lug rough blank, and the processing method comprises the following steps:
s1, taking the outer cylinder rough blank, marking and confirming, and processing clamping holes at two ends of the outer cylinder rough blank body respectively after ensuring that the outer cylinder rough blank is free of defects; then processing a first excircle, a second excircle and a third excircle which are sequentially arranged along the length direction of the body on the body;
s2, processing an inner hole at one end of the outer cylinder rough blank body where the torsion arm lug is located by taking the first outer circle, the second outer circle and the third outer circle in the step S1 as references;
s3, respectively programming a numerical control three-axis rough milling program and a numerical control five-axis semi-finishing program by adopting a three-axis Cartesian coordinate and a five-axis coordinate, then carrying out appearance rough milling on the outer cylinder rough blank by utilizing a turning and milling machining center, machining an inclined lug, an inclined annular groove and a torsion arm lug to enable the inclined lug, the inclined annular groove and the torsion arm lug to meet the requirement of appearance size, and then carrying out semi-finishing to enable the center of an inclined lug hole and the central axis of the inclined annular groove to be on the same straight line; wherein, the allowance of 2-2.5mm is reserved;
s4, sequentially quenching and tempering the outer cylinder rough blank to obtain an outer cylinder semi-finished rough blank with tensile strength of 1570-;
s5, processing a fourth excircle and a fifth excircle along the length direction of the body on the outer cylinder semi-fine rough blank to serve as subsequent processing references;
s6, boring internal threads at the hole opening of the inner hole; carrying out numerical control milling finish machining on the end surfaces of the torsion arm hole and the semi-finished rough blank of the outer cylinder, which are close to the lug of the torsion arm;
s7, assembling the outer cylinder semi-finished rough blank and the clamp together, enabling the right end face of the outer cylinder semi-finished rough blank to be tightly attached to a part mounting surface of the clamp, and fixing the outer cylinder rough blank on the clamp through the torsion arm hole;
s8, aligning the fourth excircle and the fifth excircle in the step S5, ensuring that the runout is less than or equal to 0.05, rechecking the angle of the inclined annular groove, machining a tip hole at the left end of the inclined lug, and machining an excircle at the right end of the clamp chuck; the central axis of the center hole is superposed with the central axis of the inclined annular groove;
s9, carrying out finish machining by using a numerical control lathe: clamping the outer circle of the right end of the clamp chuck by using four-claw claws of a machine tool, jacking a tailstock center into a center hole at the left end of the outer cylinder semi-finished rough blank, and aligning the processing surface of the clamp chuck to ensure that the runout is less than or equal to 0.05; rechecking the distance from the center of the inclined lug hole to the center of the inclined annular groove, and finely processing the size of the inclined annular groove to prepare for the final processing of a subsequent numerical control mill;
s10, carrying out numerical control grinding and finish machining: detaching the semi-finished rough blank of the outer cylinder together with the clamp from the numerical control lathe in the step S9, and mounting the semi-finished rough blank of the outer cylinder and the clamp on the numerical control lathe together to ensure that the central axis of the inclined annular groove is positioned on the horizontal plane; aligning the processing surface at the chuck of the clamp to ensure that the runout is less than or equal to 0.05; and meanwhile, the jumping quantity of the surface of the inclined ring-shaped groove is rechecked to be less than or equal to 0.05, the distance from the center of the hole of the inclined lug to the center of the inclined ring-shaped groove is rechecked, and finally, a grinding wheel is selected for grinding, so that the part of the inclined ring-shaped groove meets the requirement of the processing size.
In the step S1, the first outer circle, the second outer circle, and the third outer circle are obtained by turning, and the cutting parameters are as follows: the rotating speed n =30-40 r/min, the feed amount F =20-30 mm/min and the cutting depth is 0.8-1.2 mm.
The included angle between the central axis of the inclined annular groove and the central axis of the outer cylinder is 12.37 degrees.
In step S3, a phi 32-phi 63 indexing tool is selected during rough milling, and the cutting parameters are as follows: n = 800-; selecting a phi 20-phi 10 alloy cutter during semi-finishing, wherein the cutting parameters are as follows: n =1500 r/min, F =800 mm/min, depth of cut 0.5 mm.
In step S4, the outer cylinder rough blank is first kept at the austenitizing temperature for 120-. Preferably, the austenitizing temperature is 900 ℃.
The cutting parameters in step S9 are: the rotating speed is 25-30r/min, the feed rate is 0.05-0.15mm/r, and the cutting depth is 0.15-0.25 mm. Preferably, the numerical control lathing allowance in the step S9 is 0.5 mm.
In step S10, a white corundum grinding wheel is selected for grinding, and the cutting parameters are as follows: the rotating speed of the grinding wheel is 315-; the transverse feeding rough machining of the grinding wheel is 0.025 mm/stroke, and the finish machining is 0.005-0.01 mm/stroke; the axial feed amount is 3-6 mm/r.
And step S10 is followed by the step of carrying out numerical control milling finish machining and surface treatment on the outer cylinder with the inclined annular groove.
The invention relates to a method for processing an outer cylinder of a thin-wall inclined annular groove, which is characterized in that a reasonable part processing technology is formulated according to factors such as processing equipment, facilities, environmental conditions and the like by analyzing the characteristics and the processing performance of materials. The machining process controls the machining processes of equipment, cutters, heat treatment and the like, is safe in environment and the like, utilizes turn-milling three-axis rough milling machining and five-axis semi-finishing machining, and after parts are subjected to heat treatment, adopts a numerical control turn-milling and a numerical control mill again, ensures the product quality and realizes the machining of the product through a certain process strategy and a reasonable clamping mode and strict grinding parameters.
Drawings
FIG. 1 is a schematic structural diagram of an outer cylinder rough blank.
Fig. 2 is a schematic structural diagram of the outer barrel finished product.
Fig. 3 is a schematic structural view of the outer cylinder blank processed in step S1 according to the first embodiment of the present invention.
Fig. 4 is a schematic half-sectional view of the outer cylinder blank after being processed in step S2 in the first embodiment of the present invention.
Fig. 5 is a schematic structural view of the outer cylinder blank processed in step S3 in the first embodiment of the present invention.
Fig. 6 is a schematic structural view of the outer cylinder semi-finished rough blank processed in step S5 in the first embodiment of the present invention.
Fig. 7 is a schematic structural view of the outer cylinder semi-finished rough blank processed in step S6 in the first embodiment of the present invention.
FIG. 8 is a schematic view showing a state where the outer cylinder semi-finished blank is assembled with the jig in the first embodiment of the present invention.
Fig. 9 is a schematic structural view of the outer cylinder semi-finished rough blank processed in step S8 in the first embodiment of the present invention.
Fig. 10 is an enlarged view of portion i of fig. 9.
Fig. 11 is a schematic view showing the state of the outer cylinder semi-finished blank and the jigs on the respective machine tools in steps S9 and S10 in the first embodiment of the present invention.
FIG. 12 is a sectional view of a part of the jig after the outer cylinder semi-finished blank is assembled with the jig in the first embodiment of the present invention.
In the figure, 1-a body, 2-an inclined annular groove, 3-an inclined lug hole, 4-a torsion arm hole, 5-an inner hole, 6-a jaw, 7-a hole oriented lug mandrel, 8-a positioning mandrel, 9-a balancing weight, 10-a fixture body, 11-a tip hole, 12-a tailstock tip, a-an outer cylinder central axis and b-a machine tool main shaft central axis.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
The processing method of the outer barrel with the inclined annular groove comprises the following steps of:
s1, taking the outer cylinder rough blank, marking and confirming, and processing clamping holes at two ends of the outer cylinder rough blank body respectively after ensuring that the outer cylinder rough blank is free of defects; then a first excircle A, a second excircle B and a third excircle C which are sequentially arranged along the length direction of the body are processed on the body;
in the step, the equipment used by various lathes and borers must be cleaned before processing parts, and has no sundry chips; the cutting tool needs to be sharp and smooth, and each work type needs to be collided with due to large volume in the part circulation process;
s2, processing an inner hole 5 at one end of the outer cylinder rough blank body where the torsion arm lug is located by taking the first outer circle A, the second outer circle B and the third outer circle C in the step S1 as references;
s3, respectively programming a numerical control three-axis rough milling program and a numerical control five-axis semi-finish machining program by adopting a three-axis Cartesian coordinate and a five-axis coordinate, then carrying out appearance rough milling on the outer cylinder rough blank by utilizing a turning and milling machining center, machining an inclined lug, an inclined annular groove 2 and a torsion arm lug to enable the inclined lug, the inclined annular groove 2 and the torsion arm lug to meet the requirement of the appearance size, and then carrying out semi-finish machining to enable the center of an inclined lug hole 3 and the central axis of the inclined annular groove 2 to be on the same; wherein, the allowance of 2-2.5mm is reserved; finishing the angle and size characteristics of the part;
in the process, a mode of clamping one top can be adopted for positioning;
s4, sequentially quenching and tempering the outer cylinder rough blank to obtain an outer cylinder semi-finished rough blank with tensile strength of 1570-;
s5, processing a fourth excircle D and a fifth excircle E which are distributed from left to right along the length direction of the body on the body of the outer cylinder semi-fine rough blank and taking the fourth excircle D and the fifth excircle E as subsequent processing references; it should be noted that, here, the fourth outer circle D and the fifth outer circle E do not conflict with the first outer circle a, the second outer circle B and the third outer circle C in step S1, and the position range may have a common region;
because the part is deformed after heat treatment, the excircle datum is processed again, and a processing datum and an alignment datum are provided for subsequent processing steps;
s6, boring an internal thread at the orifice of the inner hole 5, so that the semi-finished rough blank of the outer cylinder is conveniently connected with the clamp through the thread; carrying out numerical control milling finish machining on the end surfaces of the torsion arm hole 4 and the semi-finished rough blank of the outer cylinder, which are close to the anti-torsion arm lug;
s7, assembling the outer cylinder semi-finished rough blank and the clamp together, enabling the right end face of the outer cylinder semi-finished rough blank to be tightly attached to a part mounting surface of the clamp, and fixing the outer cylinder rough blank on the clamp through the torque arm hole 4 to prevent swinging;
s8, aligning the fourth excircle D and the fifth excircle E in the step S5, ensuring that the runout amount is less than or equal to 0.05, rechecking the angle of the inclined annular groove, and processing a top hole at the left end of the inclined lug plate and processing the excircle at the right end of the clamp to prepare for the subsequent steps; the central axis of the center hole is superposed with the central axis of the inclined annular groove;
s9, carrying out numerical control turning: clamping a chuck at the right end of the clamp by using four-claw jaws of a machine tool, jacking a tailstock center into a center hole at the left end of the outer cylinder semi-fine rough blank, and aligning a processing surface at the chuck of the clamp to ensure that the runout amount is less than or equal to 0.05; rechecking the distance from the center of the inclined lug hole to the center of the inclined annular groove, and performing semi-finish machining on the size of the part of the inclined annular groove to prepare for subsequent finish machining of the numerical control mill;
s10, carrying out numerical control grinding: detaching the semi-finished rough blank of the outer cylinder together with the clamp from the numerical control lathe in the step S9, and mounting the semi-finished rough blank of the outer cylinder and the clamp on the numerical control lathe together to ensure that the central axis of the inclined annular groove is positioned on the horizontal plane; aligning the processing surface at the chuck of the clamp to ensure that the runout is less than or equal to 0.05; and rechecking the distance from the center of the inclined lug hole to the center of the inclined annular groove, and finally, selecting a grinding wheel for cutting to obtain the machining size of the part with the inclined annular groove.
In the step S1, the first outer circle a, the second outer circle B, and the third outer circle C are obtained by turning, and the cutting parameters are as follows: the rotating speed n =30-40 r/min, the feed amount F =20-30 mm/min and the cutting depth is 0.8-1.2 mm.
The included angle between the central axis of the inclined annular groove and the central axis of the outer cylinder is 12.37 degrees. The distance between the center of the inclined annular groove and the center of the inclined lug hole is 700 +/-0.1 mm. The distance from the center of the inclined annular groove to the right end of the outer cylinder is 1611.16 mm.
In step S3, a phi 32-phi 63 indexing tool is selected during rough milling, and the cutting parameters are as follows: n = 800-; selecting a phi 20-phi 10 indexing tool during semi-finishing, wherein the cutting parameters are as follows: n =1500 r/min, F =800 mm/min, depth of cut 0.5 mm.
The specific flow of step S3 is as follows:
the compiling method and the process are as follows: basic parameter setting → program head format setting → program tail format setting → information description in the program → post processing file generation → addition to the numerical control machining post processing template → numerical control program code generation → verification of the numerical control program → machining of the part.
In step S3, one of the three axis procedures is as follows (note: one of the procedures, for example):
program 1%:
n1 TLCH1("mill _ D32R8c",0.0) … … … … … … … tool changing "mill _ D32R8c"
N2 TLPREP1 … … … … … … … … … … … … … … … … emptying tool changer arm cutter
N3MCMILLS1 … … … … … … … … … … … … … … … … milling mode
N4G 54 … … … … … … … … … … … … … … … … … … specifies the machining coordinate system G54
N5 TLZTRANS (0,1.1) … … … … … … … … … … … … machining coordinate system offset 1.1
N6M 126 … … … … … … … … … … … … … … … … … … center frame cleaning device
N8G 90G 64 … … … … … … … … … … … … … … … … absolute value mode and continuous track mode
N9M 1=57 … … … … … … … … … … … … … … … … … center frame release
Rotation of the N10G 0G 90C 1=90 … … … … … … … … … … … … … C axis to 90 °
Centre frame clamping of N11M 1=56 … … … … … … … … … … … … … … … … …
N12Z 1=350.… … … … … … … … … … … … … … … … moves the knife to a safe distance
N13G 0X 1= 1704.303Y 1= 5.614Z 1=350. S3= 1200M 3=03 … … … spindle rotates and reaches the starting point
N14 Z1=245.
N15 G1 Z1=127.405 F800.
N16 G94 G1 Z1=124.405
Processing of procedures N17G 3X 1= 1686.092Y 1= -7.101I-2.511J-15.802 … …
……
N2870 X1=1728.736 Y1=142.1 I-.132 J16.
N2871 G0 Z1=350.
N2872M 01 … … … … … … … … … … … … … … … … … … … … procedure Selective stop
In step S3, one of the five-axis procedures is as follows (note: one of the procedures is illustrated):
% _ N _226A1_ MPF … … … … … … … … … … … … … … … … … program 1:
n1 TLCH1("Mill _ D40R8", -90) … … … … … … … … … … … knife changing "Mill _ D32R8c"
N2 TLPREP1 … … … … … … … … … … … … … … … … … … … emptying cutter in cutter changing arm
N3MCMILLS1 … … … … … … … … … … … … … … … … … … … milling mode
ZERO setting of N4 MCC1ZERO … … … … … … … … … … … … … … … … … … … C axis
N5G 00G 90G 54G 64C 1= 0M 3= 08M 3= 03S 3= 1200F 800.… main shaft rotates and reaches the point of attack
N6 MILL5AON … … … … … … … … … … … … … … … … … … … five-axis switching function
TLZTRANS (0,0.84) … … … … … … … … … … … … … … … … machining coordinate system offset 0.84
N7 X1=190.263 Y1=45.362 Z1=-1570.26 B1=-12.305 C1=-6.142
……
Processing of the program N7273X 1= 132.044Y 1= -35.376Z 1= -1560.509B 1= -12.305C 1= -4326.142 … …
N7274 G00 X1=186.444 Y1=-41.229 Z1=-1548.575 B1=-12.305 C1=-4326.142
N7275 M3=09 M3=05
TLZTRANS … … … … … … … … … … … … … … … … … … … … machining coordinate system offset cancellation
N7277 MILL5AOF … … … … … … … … … … … … … … … … … five-axis switching off function
N7278 TLCOSOF … … … … … … … … … … … … … … … … … … deselecting the tool coordinate system
ZERO setting of N7279 MCC1ZERO … … … … … … … … … … … … … … … … … C axis
N7280 G53 X1=700. D0
N7281 G53 Z1=1200.
N7282 B1=-90.
N7283 M30
In step S4, the outer cylinder rough blank is first kept at the austenitizing temperature, then oil-cooled to room temperature, and then tempered at 255-295 ℃.
The cutting parameters in step S9 are: the rotating speed is 25-30r/min, the feed rate is 0.05-0.15mm/r, and the cutting depth is 0.15-0.25 mm.
In step S10, a white corundum grinding wheel is selected for grinding, and the cutting parameters are as follows: the rotating speed of the grinding wheel is 315-; the transverse feeding rough machining of the grinding wheel is 0.025 mm/stroke, and the finish machining is 0.005-0.01 mm/stroke; the axial feed amount is 3-6 mm/r.
And step S10 is followed by the step of carrying out numerical control milling finish machining and surface treatment on the outer cylinder with the inclined annular groove.
Because the tolerance of the thread on the clamp is large, the clamp has clearance error, and preferably, after the clamp is installed, the part and the clamp are checked together, and the clamping head at the right end of the clamp is revised again.
Through three-axis and five-axis milling of the turn-milling machining center, the clamping times of workpieces are reduced, a large amount of special and general technological equipment is saved, the turn-milling machining center is adopted for milling, repeated positioning errors caused by multiple clamping are eliminated, the turn-milling machining center integrates milling, drilling, reaming, boring, tapping and thread milling, and the position precision requirement of each machined part is favorably ensured. According to the angle characteristics of the structural part, the characteristics of three shafts and five shafts of turn-milling are fully utilized, the advantages that the machine tool has two rotating shafts are fully exerted in the machining process, the shaft B is swung, and the shaft C is matched for rotating and positioning, so that the overhanging length of a cutter can be shortened, the machining of the angle characteristics of the part can be completed, programming and operation are carried out, and rough machining milling and semi-finish machining milling of the inclined annular groove are carried out.
The turning process adopts a mode of clamping one top, a top sharp hole is made at the lug piece at one end, and a set of special turning tool (eccentric chuck) is designed at the other end. The turning tool adopts a welding mode and is connected through threads, so that clamping is firm (the rotating diameter of the right end is about 900mm, the existing large lathe can meet the requirements), then a chuck and a center hole are corrected in a horizontal machining center, then the chuck of the right end of the fixture and the center hole of a left-end-top part are clamped by using a large-lathe four-jaw clamping jaw, and the machined part is converted into an axial line rotating structure, so that the continuous turning process is realized.
The grinding process needs two times of grinding process and one time of low temperature tempering, so that the product quality is ensured. The deformation of parts is eliminated to a great extent by the first grinding, internal stress is generated after large-allowance grinding, the internal stress is eliminated by keeping for about 4 hours at the temperature of 190 +/-100 ℃ subsequently, and then the final allowance of the inclined annular groove part is finely ground. During grinding, grinding parameters are very important, and on one hand, overheating and even burning of parts caused by improper parameters are avoided; on the other hand, the transitional parameters can deform the workpiece and affect the product quality, so that the grinding parameters are strictly controlled in the grinding process.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (3)
1. The processing method of the outer barrel with the inclined annular groove is formed by processing an outer barrel rough blank, the outer barrel rough blank comprises a body (1), an inclined lug rough blank is arranged at one end of the body (1), and a torsion lug rough blank is arranged at the other end of the body (1), and the processing method is characterized by comprising the following steps of:
s1, taking the outer cylinder rough blank, marking and confirming, and processing clamping holes at two ends of the outer cylinder rough blank body respectively after ensuring that the outer cylinder rough blank is free of defects; then a first excircle (A), a second excircle (B) and a third excircle (C) which are sequentially arranged along the length direction of the body are processed on the body;
wherein, first excircle (A), second excircle (B) and third excircle (C) are obtained through the turning worker cutting, and the cutting parameter is: the rotating speed n =30-40 r/min, the feed amount F =20-30 mm/min and the cutting depth is 0.8-1.2 mm;
s2, processing an inner hole (5) at one end of the outer cylinder rough blank body where the torsion arm lug is located by taking the first outer circle (A), the second outer circle (B) and the third outer circle (C) in the step S1 as references;
s3, respectively programming a numerical control three-axis rough milling program and a numerical control five-axis semi-finishing program by adopting a three-axis Cartesian coordinate and a five-axis coordinate, then carrying out appearance rough milling on the outer cylinder rough blank by utilizing a turning and milling machining center, machining an inclined lug, an inclined annular groove (2) and a torsion arm lug to enable the inclined lug, the inclined annular groove and the torsion arm lug to meet the requirement of the appearance size, and then carrying out semi-finishing to enable the center of an inclined lug hole (3) and the central axis of the inclined annular groove (2) to be on the same straight line; wherein, a margin of 2-2.5mm is reserved, a phi 32-phi 63 transposition cutter is selected during rough milling, and the cutting parameters are as follows: the rotating speed n = 800-; selecting a phi 20-phi 10 alloy cutter during semi-finishing, wherein the cutting parameters are as follows: the rotating speed n =1500 r/min, the feed rate F =800 mm/min and the cutting depth is 0.5 mm;
s4, sequentially quenching and tempering the outer cylinder rough blank to obtain an outer cylinder semi-finished rough blank with tensile strength of 1570-;
s5, processing a fourth excircle (D) and a fifth excircle (E) on the outer cylinder semi-fine rough blank along the length direction of the body to serve as subsequent processing references;
s6, boring internal threads at the hole opening of the inner hole (5); carrying out numerical control milling finish machining on the end surfaces of the torsion arm hole (4) and the semi-finished rough blank of the outer cylinder, which are close to the lug of the torsion arm;
s7, assembling the outer cylinder semi-finished rough blank and the clamp together, enabling the right end face of the outer cylinder semi-finished rough blank to be tightly attached to a part mounting surface of the clamp, and fixing the outer cylinder rough blank on the clamp through the torque arm hole (4);
s8, aligning the fourth excircle (D) and the fifth excircle (E) in the step S5, ensuring that the runout is less than or equal to 0.05, rechecking the angle of the inclined annular groove, machining a tip hole at the left end of the inclined lug plate, and machining an excircle at the right end of the clamp chuck; the central axis of the center hole is superposed with the central axis of the inclined annular groove;
s9, carrying out finish machining by using a numerical control lathe: clamping the outer circle of the right end of the clamp chuck by using four-claw claws of a machine tool, jacking a tailstock center into a center hole at the left end of the outer cylinder semi-finished rough blank, and aligning the processing surface of the clamp chuck to ensure that the runout is less than or equal to 0.05; rechecking the distance from the center of the inclined lug hole to the center of the inclined annular groove, and finely processing the size of the inclined annular groove to prepare for the final processing of a subsequent numerical control mill;
wherein, the cutting parameters during finish machining are as follows: the rotating speed is 25-30r/min, the feed rate is 0.05-0.15mm/r, and the cutting depth is 0.15-0.25 mm;
s10, carrying out numerical control grinding and finish machining: detaching the semi-finished rough blank of the outer cylinder together with the clamp from the numerical control lathe in the step S9, and mounting the semi-finished rough blank of the outer cylinder and the clamp on the numerical control lathe together to ensure that the central axis of the inclined annular groove is positioned on the horizontal plane; aligning the processing surface at the chuck of the clamp to ensure that the runout is less than or equal to 0.05; meanwhile, the jumping quantity of the inclined ring-shaped groove surface is rechecked to be less than or equal to 0.05, the distance from the center of the inclined lug hole to the center of the inclined ring-shaped groove is rechecked, and finally, a grinding wheel is selected for grinding processing, so that the inclined ring-shaped groove part meets the processing size requirement;
wherein, the white corundum grinding wheel is selected for grinding, and the cutting parameters are as follows: the rotating speed of the grinding wheel is 315-; the transverse feeding rough machining of the grinding wheel is 0.025 mm/stroke, and the finish machining is 0.005-0.01 mm/stroke; the axial feed amount is 3-6 mm/r; the included angle between the central axis of the inclined annular groove and the central axis of the outer cylinder is 12.37 degrees; the distance between the center of the inclined annular groove and the center of the inclined lug hole is 700 +/-0.1 mm; the distance from the center of the inclined annular groove to the right end of the outer cylinder is 1611.16 mm.
2. The method as claimed in claim 1, wherein in step S4, the rough blank of the outer cylinder is first kept at the austenitizing temperature for 120 and 295 minutes, then oil-cooled to room temperature, and then tempered at 255 and 295 ℃ for 180 minutes.
3. The method for processing the outer cylinder with the inclined annular groove as claimed in claim 1, wherein the step S10 is followed by a step of performing numerical control milling finish machining and surface treatment on the outer cylinder with the inclined annular groove.
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| CN108907617B (en) * | 2018-07-06 | 2020-07-17 | 江西洪都航空工业集团有限责任公司 | Machining method for complex joint part of airplane |
| CN110605618B (en) * | 2019-09-03 | 2024-04-12 | 无锡威孚马山油泵油嘴有限公司 | Processing technology of plunger grinding end face inclined starting groove |
| CN111113081A (en) * | 2019-12-13 | 2020-05-08 | 北京动力机械研究所 | Processing method of annular groove with angle |
| CN114683008B (en) * | 2022-04-24 | 2023-07-21 | 成都飞机工业（集团）有限责任公司 | Processing method of high-precision coaxial lug taper hole |
| CN115837562B (en) * | 2023-01-19 | 2023-05-16 | 山西航天清华装备有限责任公司 | Machining method for composite structure of weak thin-wall ring and two-side axial strong lugs |
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