Machining process for left-right split type camshaft bearing seat

Abstract

The left-right split type camshaft bearing seat is divided into a left bearing seat body and a right bearing seat body, and the left-right split type camshaft bearing seat machining technology comprises the first step of machining a mounting face, the second step of splicing the left bearing seat body and the right bearing seat body, and the third step of machining the mounting face. All holes in the backs of the left bearing seat and the right bearing seat are finely machined through a vertical machining center, all to-be-machined inclined planes and planes on the backs of the roughly machined bearing seats are roughly machined through the vertical machining center, and positioning surfaces on the backs of the bearing seats are finely milled to serve as positioning reference surfaces of fine machining mounting surfaces; 3, the vertical machining center is used for finish milling of hole systems in the mounting face and finish machining of hole systems in the mounting face, finish machining of assembly datum holes is carried out, positioning faces and positioning holes which are machined subsequently are the mounting face and the assembly datum holes, and therefore the datum is unified, and 4, the horizontal machining center is used for finish machining of upper and lower sets of center shaft holes of the workpiece; 5, finish-milling a plurality of inclined planes on the reverse side of the bearing seat through a horizontal machining center, and ensuring the precision of the inclined planes and a central shaft hole; a large plane is used as a positioning datum plane, and the machining precision during workpiece machining is improved.

Description

Technical Field

[0001] The invention relates to a processing technology for a split camshaft bearing seat, and in particular to a processing technology for a left-right split camshaft bearing seat. Background Art

[0002] Since both ends of the camshaft need to be installed on the integrated bearing seat, due to the installation structure of the camshaft, the integrated bearing seat cannot be installed on the camshaft. Here, the integrated bearing seat needs to be divided into two left and right sections, and the two ends of the camshaft extend into the left and right camshafts respectively, and then the left and right bearing seats are merged together; the above-mentioned left and right split camshaft bearing seats need to install two sets of camshafts, and the camshaft bearing seats need to be assembled with other parts. During processing, it is necessary to ensure the accuracy of the mounting surface of the bearing seat, the center shaft hole, and the upper inclined surface on the back of the bearing seat. Since the bearing seat is split, the left and right bearing seats need to be processed separately, which cannot guarantee the accuracy requirements of both, and the finished product processed in this way cannot meet the accuracy requirements; at the same time, the current split bearing seat processing generally uses the center shaft hole as the positioning reference, so the positioning reference surface is relatively small. During processing, when the error on the positioning reference surface is reflected on the workpiece, it will cause the workpiece processing accuracy to be reduced, which cannot meet the accuracy requirements of the workpiece and cannot meet the high-precision processing content. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned prior art, the present invention proposes a left-right split camshaft bearing seat processing technology, which uses a large plane as a positioning reference surface to improve the processing accuracy during workpiece processing. At the same time, the left and right split camshaft bearing seats are clamped on the same machine tool for processing, thus avoiding errors caused by separate processing of the left and right split camshaft bearing seats.

[0004] To achieve the above-mentioned purpose, the solution of the present invention is: a left-right split camshaft bearing seat processing technology, the left-right split camshaft bearing seat is divided into a left bearing seat and a right bearing seat, characterized in that: Process 1: Processing the mounting surface: A four-axis rotary table is installed on the vertical machining center, and a first fixture and a second fixture are installed side by side on the four-axis rotary table. The first fixture and the second fixture clamp the left bearing seat and the right bearing seat respectively, so that the left bearing seat and the right bearing seat are clamped side by side; at the same time, the vertical machining center rough mills the mounting surface, and fine-processes the positioning pin holes on the mounting surface. The four-axis rotary table rotates 90° clockwise, and rough-processes the two sets of center shaft holes on the left bearing seat and the right bearing seat, and fine-mills the assembly surfaces of the left bearing seat and the right bearing seat, and fine-processes the assembly holes on the assembly surfaces of the left bearing seat and the right bearing seat. The four-axis rotary table rotates 90° clockwise, and the vertical machining center drills the oil channel hole through the four-axis rotary table, the first fixture and the second fixture; Process 2: Splice the left bearing seat with the right bearing seat, install a four-axis turntable on the vertical machining center, and install a third fixture on the four-axis turntable. The third fixture uses the installation surface as the reference surface and the positioning pin hole on the installation surface as the positioning hole to achieve one-side two-pin positioning to complete the clamping; use the vertical machining center to finish all the hole systems on the back of the left and right bearing seats and rough-process all the inclined surfaces and planes to be processed on the back, and fine-mill the positioning surface on the back of the bearing seat, so that the positioning surface is used as the positioning reference surface for the finishing installation surface; Process three: There is a fourth fixture in the vertical machining center. The fourth fixture takes the positioning surface on the back of the bearing seat as the reference surface, and takes the positioning pin hole as the positioning hole. It performs one-side two-pin positioning. The vertical machining center fine-mills the installation surface and the hole system on the fine-machined installation surface, and fine-machines the assembly reference hole. The positioning surface and positioning hole processed subsequently are both the installation surface and the assembly reference hole, so that the reference is unified; Process 4: The fifth fixture is installed on the horizontal machining center. The fifth fixture takes the mounting surface of the bearing seat as the reference surface, takes the assembly reference hole as the positioning hole, performs one-side two-pin positioning, and uses the horizontal machining center to finish the upper and lower sets of center axis holes of the workpiece, and processes the oil passage hole on the outer wall of the bearing shell on the bearing seat. The oil passage hole is connected with the oil passage hole of process 1; Process five: The sixth fixture is installed on the horizontal machining center. The sixth fixture vertically clamps the bearing seat. The sixth fixture uses the installation surface of the workpiece as the reference surface, and the assembly reference hole as the positioning hole. It performs one-side two-pin positioning, and uses the horizontal machining center to fine-mill multiple inclined surfaces on the back of the bearing seat to ensure the accuracy of multiple inclined surfaces and the center axis hole.

[0005] Preferably, the first fixture and the second fixture clamp the blank surfaces of the left bearing seat and the right bearing seat respectively; the first fixture and the second fixture both include a first positioning plate, a first positioning module and a first clamping assembly, wherein two groups of first positioning modules arranged side by side are installed on the first positioning plate and the first positioning module, the left bearing seat and the right bearing seat are clamped on the two groups of first positioning modules respectively, and the left bearing seat and the right bearing seat are clamped by the first clamping assembly; a through hole is opened on the first positioning plate for the drill of the vertical machining center to pass through, and the machining oil of the vertical machining center is passed through A groove with a downward depression is opened in the first positioning plate, and the vertical machining center extends into the groove to mill the surface of the protrusion on the top of the right bearing seat and drill the assembly hole; when processing, first use the vertical machining center to rough mill the mounting surface and rough-machine all the holes on the mounting surface, the four-axis turntable rotates 90° counterclockwise, the vertical machining center fine-mills the assembly surface of the left bearing seat and the right bearing seat, and rough-machines the center axis hole. At the same time, the assembly surface of the left bearing seat and the right bearing seat is fine-milled, and the assembly holes on the assembly surface are fine-machined. The vertical machining center rotates 90° counterclockwise to process the oil channel hole through the through hole.

[0006] Preferably, the first positioning module includes a first swing block, a second swing block, a lifting assembly and a first clamping rod, two embedding grooves are opened on the first mounting plate, the first swing block is stuck in the mounting groove for rotation connection, the first swing block is a channel steel, so that the two ends of the first swing block can swing up and down, and the second swing block and the lifting assembly are respectively installed on the top of the two ends of the first swing block, the first swing block is installed on one end of the first swing block by rotational cooperation, and the other end of the first swing block is installed with a lifting assembly, and a lifting assembly is also installed on the first positioning plate below the left bearing seat and the right bearing seat, and the lifting assembly is a plane cut out of the spherical surface of the universal ball; a first clamping rod is installed on the first positioning plate, which is against one end of the inner side of the left bearing seat and the right bearing seat and on the back of the assembling surface, and pressing grooves are opened on both sides of the mounting surface and back of the left bearing seat and the right bearing seat, and the first clamping assembly is embedded in the pressing groove for pressing.

[0007] Preferably, after the left bearing seat and the right bearing are spliced ​​together, they are clamped by a third tooling fixture, which includes a third positioning plate, a third positioning pin, a third positioning boss and a third clamping assembly, wherein a plurality of third positioning protrusions are installed on the third positioning plate, the third positioning protrusions are against the mounting surface, and two third positioning pins extending into the mounting hole system are installed on the third positioning plate, and there are two third clamping assemblies and the two third clamping assemblies are located on the same side, and the third clamping assembly extends into the pressing groove to clamp the assembled bearing; the plurality of hole systems on the back of the bearing seat are first processed by the vertical machining center, the inclined holes on the back are processed by the rotation of the four-axis turntable, and then the plane and inclined surface on the back of the bearing seat are reset and processed, and finally the positioning surface on the back is precision milled, wherein the positioning surfaces are two groups, one group of positioning surfaces is a plane, and the other group of positioning surfaces is an inclined surface, to ensure that the plane tolerance of the positioning surfaces is between -0.02 and +0.02 mm.

[0008] Preferably, the fourth tooling fixture includes a fourth positioning plate, a fourth positioning pin, a fourth positioning protrusion and a fourth clamping assembly, wherein a fourth positioning pin extending into the mounting hole system is installed on the fourth positioning plate, and a fourth positioning protrusion that fits with the positioning surface on the back side of the bearing seat is installed on the fourth positioning plate. The fourth positioning protrusions are divided into two groups, each group of fourth positioning protrusions consists of two pieces and each group of fourth positioning protrusions is located on the same side of the workpiece, one group of positioning protrusions fits with the plane on the back side of the workpiece, and the other group of positioning protrusions fits with the inclined surface on the back side of the workpiece. The fourth clamping assembly is located directly above each positioning protrusion, and the fourth clamping assembly extends into the pressing groove for clamping.

[0009] Preferably, the fifth fixture comprises a fifth positioning plate, a fifth positioning pin, a fifth positioning protrusion and a fifth clamping assembly, two upwardly extending support seats are installed on the fifth positioning plate, the two support seats are longitudinally arranged in parallel, a fifth positioning protrusion and a fifth positioning pin are installed on the top surface of each support seat, the fifth positioning protrusion is fitted with the mounting surface of the workpiece, the fifth positioning positioning pin extends into the assembly reference hole for positioning, and a fifth clamping assembly is arranged directly above the fifth positioning protrusion, and the upper and lower sets of center axis holes on the bearing seat are processed in sequence by the horizontal machining center, the center axis hole of the upper layer of the left bearing seat is first fine-milled, the bearing seat is rotated 180°, and then the center of the upper layer of the right bearing seat is fine-milled The shaft hole, and then the milling cutter of the horizontal machining center descends to fine-mill the center shaft hole of the lower layer of the right bearing seat, and then rotates 180° for processing, and fine-mills the center shaft hole of the lower layer of the right bearing seat. The spacing between the upper center shaft hole and the lower center shaft hole is 61.288mm, and the tolerance is -0.01~+0.01mm. The center axis of the lower center shaft hole is parallel to the connecting line of the two reference holes and the spacing between the two is 144mm, and the tolerance is -0.01~+0.01mm. After the fine milling of the lower center shaft hole is completed, the upper center shaft hole and the lower center shaft hole are formed on both end faces, and an oblique groove is opened on the end face of the lower center shaft hole. Finally, the oil channel hole on the outer wall of the bearing shell is processed by rotating the turntable.

[0010] Preferably, the sixth tooling fixture includes an angle iron, a sixth positioning plate, a sixth positioning pin, a sixth positioning protrusion and a sixth clamping assembly. The sixth positioning plate is vertically mounted on the 90° angle iron, and the angle iron is mounted on the turntable of the horizontal machining center. The sixth positioning pin and the sixth positioning protrusion are mounted on the sixth positioning, and the sixth positioning pin and the sixth positioning protrusion are both mounted on the sixth positioning plate. The sixth positioning protrusion contacts the mounting surface of the workpiece. There are two sixth positioning pins and the two sixth positioning pins extend into the assembly reference hole of the workpiece. The sixth clamping assembly is pressed on the back of the workpiece. A through groove is opened on the sixth positioning plate for the workpiece to pass through. At the same time, the horizontal machining center performs precision milling on the inclined surface on the back of the bearing seat to ensure that the spacing tolerance between the inclined surface and the center axis of the upper center axis hole is -0.01~+0.01mm.

[0011] Compared with the prior art, the advantages of the present invention are: 1. Using a large plane as a positioning reference plane improves the processing accuracy of the workpiece; 2. The left and right split camshaft bearing seats are clamped on the same machine tool for processing at the same time, thus avoiding the error caused by separate processing of the left and right split camshaft bearing seats. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional diagram of a workpiece to be processed according to the present invention.

[0013] Figure 2 It is the front view of the workpiece to be processed of the present invention.

[0014] Figure 3This is a bottom view of the workpiece to be processed.

[0015] Figure 4 It is a schematic diagram of the left bearing seat of the present invention.

[0016] Figure 5 It is a schematic diagram of the right bearing seat of the present invention.

[0017] Figure 6 It is a schematic diagram of the oil channel hole and the left bearing seat and the right bearing seat of the present invention.

[0018] Figure 7 It is a schematic diagram of the first fixture and the second fixture of the present invention.

[0019] Figure 8 It is a schematic diagram of the third tooling fixture of the present invention.

[0020] Fig. 9 It is a schematic diagram of the fourth tooling fixture of the present invention.

[0021] Fig.10 It is a schematic diagram of the fifth fixture of the present invention.

[0022] Fig.11 It is a schematic diagram of the sixth tooling fixture of the present invention.

[0023] Among them, 1. left bearing seat, 2. right bearing seat, 3. mounting surface, 4. positioning pin hole, 5. assembly surface, 6. assembly hole, 7. oil channel hole, 8. center shaft hole, 9. positioning surface, 10. assembly reference hole, 11. pressing groove, 12. four-axis turntable, 13. first fixture, 14. second fixture, 15. first positioning plate, 16. first positioning module, 17. first swing block, 18. second swing block, 19. lifting assembly, 20. first clamping rod, 21. first clamping assembly, 22. third fixture, 23. third positioning plate, 2 4. The third locating pin, 25. The third locating boss, 26. The third clamping assembly, 27. The fourth fixture, 28. The fourth locating plate, 29. The fourth locating pin, 30. The fourth locating protrusion, 31. The fourth clamping assembly, 32. The fifth fixture, 33. The fifth locating plate, 34. The fifth locating pin, 35. The fifth locating protrusion, 36. The fifth clamping assembly, 37. The sixth fixture, 38. The angle iron, 39. The sixth locating plate, 40. The sixth locating pin, 41. The sixth locating protrusion, 42. The sixth clamping assembly, 43. The back side, 44. The protrusion. DETAILED DESCRIPTION

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] like Figure 1-11As shown, a left-right split camshaft bearing seat processing technology, the left-right split camshaft bearing seat is divided into a left bearing seat 1 and a right bearing seat 2, characterized in that: Process 1: Processing the mounting surface 3: A four-axis turntable 12 is installed on the vertical machining center, and a first fixture 13 and a second fixture 14 arranged side by side are installed on the four-axis turntable 12. The first fixture 13 and the second fixture 14 clamp the left bearing seat 1 and the right bearing seat 2 respectively, so that the left bearing seat 1 and the right bearing seat 2 are clamped side by side; the left bearing seat 1 and the right bearing seat 2 are clamped side by side on the four-axis turntable 12, and the left bearing seat 1 and the right bearing seat can be rotated 2360° by the four-axis turntable 12. After the left bearing seat 1 and the right bearing seat 2 are clamped, the mounting surfaces 3 of the left bearing seat 1 and the right bearing seat 2 are roughly milled by the vertical machining center, and then the locating pin holes 4 on the mounting surfaces 3 of the left bearing seat 1 and the right bearing seat 2 are finely processed by the drill on the vertical machining center. , the four-axis turntable 12 rotates 90° clockwise, the vertical machining center first rough mills the assembly surface 5 of the left bearing seat 1 and the right bearing seat 2, and then drills the assembly holes 6 on the assembly surface 5 of the left bearing seat 1 and the right bearing seat 2, fine mills the assembly surface 5, the four-axis turntable 12 rotates 90° clockwise, and roughly machines the two sets of center axis holes 8 on the left bearing seat 1 and the right bearing seat 2. Holes for the drill on the vertical machining center to pass through are opened on the four-axis turntable 12, the first fixture 13 and the second fixture 14. The drill of the vertical machining center passes through the four-axis turntable 12, the first fixture 13 and the second fixture 14 to drill the oil channel holes 7 on the flip surfaces of the left bearing seat 1 and the right bearing seat 2; between the two processes, the left bearing seat 1 and the right bearing seat 2 are assembled, and locked by bolts passing through the assembly holes 6.

[0026] Process 2: Splice the left bearing seat 1 and the right bearing seat 2. A four-axis turntable 12 is installed on the vertical machining center. A third fixture 22 is installed on the four-axis turntable 12. The third fixture 22 uses the mounting surface 3 rough-machined in process 1 as the reference surface, and the positioning pin hole 4 on the mounting surface 3 as the positioning hole to achieve one-side two-pin positioning to complete the clamping. After the workpiece is clamped, all the planes on the back side 43 of the workpiece are milled and all the straight holes on the back side 43 of the workpiece are drilled through the vertical machining center. The four-axis turntable 12 rotates to tilt the workpiece. The inclined surface on the back side 43 is milled and drilled through the vertical machining center. The positioning accuracy of the mounting surface 3 needs to be improved. The next process needs to be The back surface 43 is used as a clamping reference surface. When processing the back surface 43, a plane and an inclined surface are finely milled as reference surfaces by a vertical machining center (because the left bearing seat 1 and the right bearing seat 2 need to be spliced, a protrusion 44 extending outward is installed on the circumferential shell of the left bearing seat 1 and the right bearing seat 2 by an integral casting method, and a splicing hole is punched on the protrusion 44 for splicing. When the end faces of the left bearing seat 1 and the right bearing seat 2 are milled, the end faces of the protrusion 44 are milled at the same time, so that the processing of the assembly surface 5 is completed. After the milling is completed, the assembly holes 6 are drilled on the assembly surface 5 by punching), and the positioning pin holes 4 on the mounting surface 3 of the first process are used as positioning holes; Process three: There is a fourth fixture 27 in the vertical machining center. The fourth fixture 27 uses the finely machined plane and inclined surface on the back side 43 of the bearing seat as the positioning surface 9, and uses the two positioning pin holes 4 on the mounting surface 3 as positioning holes to perform one-side two-pin positioning, and the vertical machining center finely mills the mounting surface 3 and the hole system on the finely machined mounting surface 3 to finely machine the assembly reference hole 10 on the front side of the workpiece; Process one uses the blank surface as the positioning reference surface to machine the mounting surface 3, so the precision of the machined mounting surface 3 is not high, which will cause the subsequent workpiece to fail to meet the relatively high precision requirements. This application uses the blank surface as the positioning reference surface to machine the mounting surface 3, and then uses the mounting surface 3 as the reference surface to finely machine the plane and inclined surface of the back side 43 of the workpiece, and uses the plane and inclined surface on the back side 43 as the reference surface to finely machine the mounting surface 3, so that the precision of the mounting surface 3 is relatively high, and the subsequent process uses the mounting surface 3 as the positioning reference surface, so that the machining precision of the workpiece is relatively high. At the same time, the mounting surface 3 is a large plane, so that the deviation of the mounting surface 3 caused by the precision has a relatively small effect on the precision of the workpiece machining; Process 4: The fifth fixture 32 is installed on the turntable of the horizontal machining center. The fifth fixture 32 takes the mounting surface 3 of the bearing seat as the reference surface, takes the reference hole as the positioning hole, and performs one-side two-pin positioning. The upper and lower sets of center shaft holes 8 are finely processed by the horizontal machining center, and the oil channel hole 7 on the outer wall of the bearing shell on the bearing seat is processed; after the workpiece is clamped, the two sets of center shaft holes 8 of the right bearing seat 2 are finely processed by the horizontal machining center by moving up and down. After the right bearing seat 2 is processed, the turntable rotates clockwise by 1 80°, the horizontal machining center finely processes the two sets of center shaft holes 8 of the left bearing seat 1 by moving up and down, the turntable rotates 90° counterclockwise, and the horizontal machining center drills the oil passage hole 7 on the outer wall of the bearing shell on the bearing seat, and the oil passage hole 7 is connected with the oil passage hole 7 of the process 1. The above two sets of center shaft holes 8 arranged up and down are processed by the horizontal machining center, so that the center distance accuracy of the two sets of center shaft holes 8 is high. At the same time, since the assembly reference hole 10 is used as the positioning hole, the accuracy requirement between the center shaft hole 8 and the assembly reference hole 10 is guaranteed; Process 5: A sixth fixture 37 is installed on the horizontal machining center. The sixth fixture 37 vertically clamps the workpiece. The sixth fixture 37 takes the mounting surface 3 of the bearing seat as the reference surface, takes the reference hole as the positioning hole, and performs one-side two-pin positioning. The horizontal machining center is used to fine-mill multiple inclined surfaces on the back of the bearing seat to ensure the accuracy of multiple inclined surfaces 43 on the back of the workpiece and the central axis hole 8, which is convenient for subsequent installation; This processing procedure uses the large surface of the mounting surface 3 as the reference surface, and the assembly reference hole 10 (the assembly reference hole 10 is the reference hole during customer assembly) as the reference hole, and processes the center axis hole 8 and the inclined surface on the back side 43 of the workpiece. Since the precision of the mounting surface 3 and the assembly reference hole 10 is relatively high, and the mounting surface 3 is a large plane, the overall precision of the workpiece is improved.

[0027] The first fixture 13 and the second fixture 14 clamp the blank surfaces of the left bearing seat 1 and the right bearing seat 2 respectively; the first fixture 13 and the second fixture 14 both include a first positioning plate 15, a first positioning module 16 and a first clamping assembly 21, wherein two groups of first positioning modules 16 arranged side by side are installed on the first positioning plate 15 and the first positioning module 16, and the left bearing seat 1 and the right bearing seat 2 are clamped on the two groups of first positioning modules 16 respectively, and the left bearing seat 1 and the right bearing seat 2 are clamped by the first clamping assembly 21. The first clamping assembly 21 includes a screw rod, a nut and a pressure block. A plurality of vertically arranged screw rods are installed on the first positioning plate 15 and the first positioning module 16 on both sides of each group of first positioning modules 16. A waist-shaped hole is opened on each pressure block, and the screw rod passes through the waist-shaped hole. A nut is sleeved on the top of the screw rod. The pressure block is pressed by the nut, and the pressure block is pressed on the bearing seat (a groove body for making way for the pressure block is opened on both sides of the mounting surface 3 of the bearing seat); a through hole for the drill of the vertical machining center to pass through is opened on the first positioning plate 15, and the vertical machining center is opened through the vertical machining center. The center processes the oil passage hole 7, and a groove is opened on the top surface of the first positioning plate 15, and the groove is located at the first positioning module 16 on the right side. Since the right bearing seat 2 is longer than the first positioning plate 15, and the left bearing seat 1 protrudes from the first positioning plate 15, when fine milling the assembly surface 5 of the right bearing seat 2 and drilling the assembly hole 6 on the assembly surface 5, the groove is required to give way to the tool of the vertical machining center. Since the left bearing seat 1 is longer and protrudes from the first positioning plate 15, there is no need to set a groove on the first positioning plate 15 to allow the tool of the vertical machining center to move. The tool gives way; when processing, first use the vertical machining center to rough mill the mounting surface 3 and rough-machine all the holes on the mounting surface 3, the four-axis turntable 12 rotates 90° clockwise, the vertical machining center rough mills the assembly surface 5 of the left bearing seat 1 and the right bearing seat 2, and the rough-machines the center axis hole 8. At the same time, the assembly surface 5 of the left bearing seat 1 and the right bearing seat 2 is fine-milled, and the assembly hole 6 is drilled on the assembly surface 5. The vertical machining center rotates 90° clockwise to process the oil channel hole 7 on the back side 43 of the left bearing seat 1 and the right bearing seat 2 through the through hole of the first positioning plate 15.

[0028] The first positioning module 16 includes a first swing block 17, a second swing block 18, a lifting assembly 19 and a first clamping rod 20. Two transverse embedding grooves are arranged side by side on the top surface of the first positioning plate 15 and near the front end. The first swing block 17 is inserted into the embedding groove for rotation connection (the first swing block 17 is inserted into the embedding groove, and the front end of the first positioning plate 15 and the first swing block 17 are provided with coaxial through holes. The rotating shaft passes through the front end of the first positioning plate 15 and the through hole of the first swing block 17 to realize rotation connection, so that the first swing block 17 can swing at both ends), the first swing block 17 is a channel steel, so that the two ends of the first swing block 17 can swing up and down, and the second swing block 18 and the lifting assembly 19 are respectively installed on the top of the two ends of the first swing block 17, and the second swing block 18 is installed on one end of the first swing block 17 by rotational matching (the second swing blocks 18 on the two sets of first positioning modules 16 are located on the outer end of each first swing block 17, and the second swing block 18 and the first swing block 17 are also provided with coaxial through holes , a rotating shaft is inserted into the through hole of the first swing block 17 and the second swing block 18 to realize rotation connection), a lifting assembly 19 is fixed to the other end of the first swing block 17 by welding (the lifting assembly 19 is a universal ball, and a plane is cut out of the universal ball as the top surface, which is convenient for plane positioning), and a lifting assembly 19 is also installed on the first positioning plate 15 below the left bearing seat 1 and the right bearing seat 2, which is against the back side 43 of the left bearing seat 1 and the right bearing seat 2, and the first clamping assembly 21 is respectively located on each lifting assembly 19 Directly above the second swing block 18, the screw of the first clamping assembly 21 above the second swing block 18 is installed on the first swing block 17; a first clamping rod 20 is installed on the first positioning plate 15, which is pressed against one end of the inner side of the left bearing seat 1 and the right bearing seat 2 and the back side 43 of the assembly surface 5, and pressing grooves 11 are opened on the mounting surface 3 and the back side 43 of the left bearing seat 1 and the right bearing seat 2. The first clamping assembly 21 is embedded in the pressing groove 11 for pressing, so that the first clamping assembly 21 can be pressed when processing the mounting surface 3.

[0029] After the left bearing seat 1 and the right bearing are spliced ​​together, they are clamped by the third fixture 22, which includes a third positioning plate 23, a third positioning pin 24, a third positioning boss 25 and a third clamping assembly 26, wherein a plurality of third positioning protrusions are installed on the third positioning plate 23, the third positioning protrusions are against the mounting surface 3, two third positioning pins 24 extending into the hole system of the mounting surface 3 are installed on the third positioning plate 23, and the third clamping assembly 26 extends into the pressing groove 11 to press the assembled shaft. The bearing is clamped, and the third clamping component 26 has the same structure as the first clamping component 21; a plurality of hole systems on the back side 43 of the bearing seat are first processed by a vertical machining center, and the inclined holes on the back side 43 are processed by rotating the four-axis turntable 12, and then the plane and inclined surface on the back side 43 of the bearing seat are reset and processed, and finally the locating surface 9 on the back side 43 is finely milled, wherein the locating surfaces 9 are divided into two groups, one group of locating surfaces 9 is a plane, and the other group of locating surfaces 9 is an inclined surface, to ensure that the plane tolerance of the locating surface 9 is -0.02~+0.02mm.

[0030] The fourth fixture 27 includes a fourth positioning plate 28, a fourth positioning pin 29, a fourth positioning protrusion 30 and a fourth clamping assembly 31, wherein the fourth positioning pin 29 extending into the hole system of the mounting surface 3 is installed on the fourth positioning plate 28, and the fourth positioning protrusion 30 that fits with the positioning surface 9 of the back side 43 of the bearing seat is installed on the fourth positioning plate 28. The fourth positioning protrusion 30 is divided into two groups, each group of the fourth positioning protrusion 30 is two pieces, and each group of the fourth positioning protrusion 30 is located on the same side of the workpiece, and one group of positioning protrusions 30 is located on the same side of the workpiece. The protrusion fits with the plane on the back side 43 of the workpiece, and another group of positioning protrusions fits with the inclined surface on the back side 43 of the workpiece. The fourth clamping component 31 is located directly above each positioning protrusion, and the fourth clamping component 31 has the same structure as the first clamping component 21. The fourth clamping component 31 extends into the pressing groove 11 for clamping. After the workpiece is clamped, the mounting surface 3 of the workpiece is fine-milled by the vertical machining center, and the hole system on the mounting surface 3 is fine-machined. At the same time, the assembly reference hole 10 is fine-machined as a common positioning hole for subsequent processing.

[0031] The fifth fixture 32 includes a fifth positioning plate 33, a fifth positioning pin 34, a fifth positioning protrusion 35 and a fifth clamping assembly 36. Two upwardly extending support seats are installed on the fifth positioning plate 33. The two support seats are arranged in parallel longitudinally. A fifth positioning protrusion 35 and a fifth positioning pin 34 are installed on the top surface of each support seat. The fifth positioning protrusion 35 is in contact with the mounting surface 3 of the workpiece. The fifth positioning and positioning pin extends into the assembly reference hole 10 for positioning. A fifth clamping assembly 36 is arranged directly above the fifth positioning protrusion 35. The fifth clamping assembly 36 has the same structure as the first clamping assembly 21. A column is hinged at the tail of the clamping block of the fifth clamping assembly 36. The bottom of the column is installed on the fifth positioning plate 33. The upper and lower sets of center axis holes 8 on the bearing seat are sequentially fine-machined by a horizontal machining center. The center axis hole 8 on the upper layer of the left bearing seat 1 is first fine-milled, and the end face of the center axis hole 8 is fine-milled. , the bearing seat rotates 180°, and then fine mills the center axis hole 8 of the upper layer of the right bearing seat 2, and fine mills the end face of the center axis hole 8. Then the milling cutter of the horizontal machining center descends, and fine mills the center axis hole 8 of the lower layer of the right bearing seat 2, and fine mills the end face of the center axis hole 8. Then it rotates 180° for processing, and fine mills the center axis hole 8 of the lower layer of the right bearing seat 2, and fine mills the end face of the center axis hole 8. The spacing between the upper center axis hole 8 and the lower center axis hole 8 is 61.288mm, and the tolerance is -0.01~+0.01mm. The center axis of the lower center axis hole 8 is parallel to the connecting line of the two reference holes and the spacing between the two is 144mm, and the tolerance is -0.01~+0.01mm. After the fine milling of the lower center axis hole 8 is completed, the upper center axis hole 8 and the lower center axis hole 8 are formed at both end faces, and an oblique groove is opened on the end face of the lower center axis hole 8. Finally, the oil channel hole 7 on the outer wall of the bearing shell is processed by rotating the turntable.

[0032] The sixth fixture 37 includes an angle iron 38, a sixth positioning plate 39, a sixth positioning pin 40, a sixth positioning protrusion 41 and a sixth clamping assembly 42. The sixth positioning plate 39 is vertically mounted on the 90° angle iron 38. The angle iron 38 is mounted on the turntable of the horizontal machining center. The sixth fixture 37 is used to complete the vertical clamping of the bearing seat. The sixth positioning pin 40 and the sixth positioning protrusion 41 are mounted on the sixth positioning plate 39. The sixth positioning protrusion 41 and the sixth clamping assembly 42 are connected to the sixth positioning plate 39. The sixth locating pins 40 are in contact with the mounting surface 3 of the workpiece, there are two sixth locating pins 40 and the two sixth locating pins 40 extend into the assembly reference hole 10 of the workpiece, the sixth clamping component 42 is pressed on the back side 43 of the workpiece, the sixth clamping component 42 is consistent with the first clamping component 21 in structure, and a through groove for the workpiece to pass through is opened on the sixth locating plate 39. At the same time, the horizontal machining center performs precision milling on the inclined surface on the back side 43 of the bearing seat to ensure that the spacing tolerance between the multiple inclined surfaces on the back side 43 of the workpiece and the center axis of the upper center axis hole 8 is -0.01~+0.01mm.

Claims

1. A left-right split camshaft bearing seat processing technology, the left-right split camshaft bearing seat is divided into a left bearing seat and a right bearing seat, characterized in that: Process 1: Processing the mounting surface: A four-axis rotary table is installed on the vertical machining center, and a first fixture and a second fixture are installed side by side on the four-axis rotary table. The first fixture and the second fixture clamp the left bearing seat and the right bearing seat respectively, so that the left bearing seat and the right bearing seat are clamped side by side; at the same time, the vertical machining center rough mills the mounting surface, and fine-processes the positioning pin holes on the mounting surface. The four-axis rotary table rotates 90° clockwise, and rough-processes the two sets of center shaft holes on the left bearing seat and the right bearing seat, and fine-mills the assembly surfaces of the left bearing seat and the right bearing seat, and fine-processes the assembly holes on the assembly surfaces of the left bearing seat and the right bearing seat. The four-axis rotary table rotates 90° clockwise, and the vertical machining center drills the oil channel hole through the four-axis rotary table, the first fixture and the second fixture; Process 2: Splice the left bearing seat with the right bearing seat, install a four-axis turntable on the vertical machining center, and install a third fixture on the four-axis turntable. The third fixture uses the installation surface as the reference surface and the positioning pin hole on the installation surface as the positioning hole to achieve one-side two-pin positioning to complete the clamping; use the vertical machining center to finish all the hole systems on the back of the left and right bearing seats and rough-process all the inclined surfaces and planes to be processed on the back, and fine-mill the positioning surface on the back of the bearing seat, so that the positioning surface is used as the positioning reference surface for the finishing installation surface; Process three: There is a fourth fixture in the vertical machining center. The fourth fixture takes the positioning surface on the back of the bearing seat as the reference surface, and takes the positioning pin hole as the positioning hole. It performs one-side two-pin positioning. The vertical machining center fine-mills the installation surface and the hole system on the fine-machined installation surface, and fine-machines the assembly reference hole. The positioning surface and positioning hole processed subsequently are both the installation surface and the assembly reference hole, so that the reference is unified; Process 4: The fifth fixture is installed on the horizontal machining center. The fifth fixture takes the mounting surface of the bearing seat as the reference surface, takes the assembly reference hole as the positioning hole, performs one-side two-pin positioning, and uses the horizontal machining center to finish the upper and lower sets of center axis holes of the workpiece, and processes the oil passage hole on the outer wall of the bearing shell on the bearing seat. The oil passage hole is connected with the oil passage hole of process 1; Process five: The sixth fixture is installed on the horizontal machining center. The sixth fixture vertically clamps the bearing seat. The sixth fixture uses the installation surface of the workpiece as the reference surface, and the assembly reference hole as the positioning hole. It performs one-side two-pin positioning, and uses the horizontal machining center to fine-mill multiple inclined surfaces on the back of the bearing seat to ensure the accuracy of multiple inclined surfaces and the center axis hole.

2. The left-right split camshaft bearing seat processing technology according to claim 1 is characterized in that: The first fixture and the second fixture clamp the blank surfaces of the left bearing seat and the right bearing seat respectively; the first fixture and the second fixture both include a first positioning plate, a first positioning module and a first clamping assembly, wherein two groups of first positioning modules arranged side by side are installed on the first positioning plate and the first positioning module, the left bearing seat and the right bearing seat are clamped on the two groups of first positioning modules respectively, and the left bearing seat and the right bearing seat are clamped by the first clamping assembly; a through hole for the vertical machining center drill to pass through is opened on the first positioning plate, and an oil channel hole is processed by the vertical machining center, and a downward through hole is opened on the first positioning plate The vertical machining center extends into the recessed groove body to mill the surface of the protrusion on the outer periphery of the right bearing seat and drill the assembly holes. The end faces of the left and right bearing seats and the end faces of the protrusions constitute the assembly surface; when processing, first use the vertical machining center to rough mill the mounting surface and rough-machine all the holes on the mounting surface, and then rotate the four-axis turntable 90° counterclockwise. The vertical machining center will fine-mill the assembly surface of the left and right bearing seats, initially machine the center axis hole, and at the same time fine-machine the assembly surface of the left and right bearing seats, fine-machine the assembly holes on the assembly surface, and rotate 90° counterclockwise to machine the oil channel hole through the through hole in the vertical machining center.

3. The left-right split camshaft bearing seat processing technology according to claim 2 is characterized in that: The first positioning module includes a first swing block, a second swing block, a lifting assembly and a first clamping rod. Two embedding grooves are opened on the first mounting plate, and the first swing block is inserted into the mounting groove for rotational connection. The first swing block is a channel steel, so that the two ends of the first swing block can swing up and down. The second swing block and the lifting assembly are respectively installed on the top of the two ends of the first swing block. The first swing block is installed on one end of the first swing block by rotational cooperation, and the other end of the first swing block is installed with a lifting assembly. A lifting assembly that presses against the back of the left bearing seat and the right bearing seat is also installed on the first positioning plate below the left bearing seat and the right bearing seat. The lifting assembly is a plane cut out of the spherical surface of the universal ball; a first clamping rod that presses against one end of the inner side of the left bearing seat and the right bearing seat and on the back of the assembly surface is installed on the first positioning plate, and pressing grooves are opened on the mounting surface and back of the left bearing seat and the right bearing seat, and the first clamping assembly is embedded in the pressing groove for pressing.

4. The left-right split camshaft bearing seat processing technology according to claim 3 is characterized in that: After the left bearing seat and the right bearing are spliced ​​together, they are clamped by a third fixture, which includes a third locating plate, a third locating pin, a third locating boss and a third clamping assembly, wherein a plurality of third locating protrusions are installed on the third locating plate, the third locating protrusions are against the mounting surface, and two third locating pins extending into the mounting hole system are installed on the third locating plate, and there are two third clamping assemblies, and the two third clamping assemblies are located on the same side, and the third clamping assembly extends into the pressing groove to clamp the assembled bearing; a plurality of hole systems on the back of the bearing seat are first processed by a vertical machining center, the inclined holes on the back are processed by the rotation of the four-axis turntable, and then the plane and inclined surface on the back of the bearing seat are reset and processed, and finally the locating surface on the back is precision milled, wherein the locating surfaces are two groups, one of which is a plane, and the other group of which is an inclined surface, to ensure that the plane tolerance of the locating surface is between -0.02 and +0.02 mm.

5. The left-right split camshaft bearing seat processing technology according to claim 4 is characterized in that: The fourth tooling fixture includes a fourth positioning plate, a fourth positioning pin, a fourth positioning protrusion and a fourth clamping assembly, wherein a fourth positioning pin extending into the mounting hole system is installed on the fourth positioning plate, and a fourth positioning protrusion that fits with the positioning surface on the back side of the bearing seat is installed on the fourth positioning plate. The fourth positioning protrusions are divided into two groups, each group of fourth positioning protrusions has two pieces and each group of fourth positioning protrusions is located on the same side of the workpiece, one group of positioning protrusions fits with the plane on the back side of the workpiece, and the other group of positioning protrusions fits with the inclined surface on the back side of the workpiece. The fourth clamping assembly is located directly above each positioning protrusion, and the fourth clamping assembly extends into the pressing groove for clamping.

6. The left-right split camshaft bearing seat processing technology according to claim 5 is characterized in that: The fifth fixture includes a fifth locating plate, a fifth locating pin, a fifth locating protrusion and a fifth clamping assembly. Two upwardly extending support seats are installed on the fifth locating plate. The two support seats are arranged in parallel longitudinally. A fifth locating protrusion and a fifth locating pin are installed on the top surface of each support seat. The fifth locating protrusion fits the mounting surface of the workpiece. The fifth locating locating pin extends into the assembly reference hole for positioning. A fifth clamping assembly is arranged directly above the fifth locating protrusion. The upper and lower sets of center axis holes on the bearing seat are processed in sequence by the horizontal machining center. The center axis hole of the upper layer of the left bearing seat is first fine-milled. The bearing seat is rotated 180°, and then the center axis hole of the upper layer of the right bearing seat is fine-milled. , and then the milling cutter of the horizontal machining center descends to fine-mill the center axis hole of the lower layer of the right bearing seat, and then rotates 180° for processing, and fine-mills the center axis hole of the lower layer of the right bearing seat. The spacing between the upper center axis hole and the lower center axis hole is 61.288mm, and the tolerance is -0.01~+0.01mm. The center axis of the lower center axis hole is parallel to the connecting line of the two reference holes and the spacing between the two is 144mm, and the tolerance is -0.01~+0.01mm. After the fine milling of the lower center axis hole is completed, the upper center axis hole and the lower center axis hole are formed on both end faces, and an inclined groove is opened on the end face of the lower center axis hole. Finally, the oil channel hole on the outer wall of the bearing shell is processed by rotating the turntable.

7. The left-right split camshaft bearing seat processing technology according to claim 6 is characterized in that: The sixth tooling fixture includes an angle iron, a sixth locating plate, a sixth locating pin, a sixth locating protrusion and a sixth clamping assembly. The sixth locating plate is vertically installed on the 90° angle iron, and the angle iron is installed on the turntable of the horizontal machining center. The sixth locating pin and the sixth locating protrusion are installed on the sixth positioning, and the sixth locating pin and the sixth locating protrusion are both installed on the sixth locating plate. The sixth locating protrusion contacts the mounting surface of the workpiece. There are two sixth locating pins and the two sixth locating pins extend into the assembly reference hole of the workpiece. The sixth clamping assembly is pressed on the back of the workpiece. A through groove is opened on the sixth locating plate for the workpiece to pass through. At the same time, the horizontal machining center performs precision milling on the inclined surface on the back of the bearing seat to ensure that the spacing tolerance between the inclined surface and the center axis of the upper center axis hole is -0.01~+0.01mm.

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