A double helix trajectory precision grinder for automobile steering gear ball screw

Abstract

The application relates to a double-spiral trajectory precision grinding machine for automobile steering gear ball screw, and belongs to the technical field of automobile steering gear ball screw grinding equipment. The double-spiral trajectory precision grinding machine for automobile steering gear ball screw comprises a conveying plate chain line, a machine base, a transfer assembly, a grinding assembly and a positioning assembly. The conveying plate chain line is provided with the machine base on one side. A main sliding plate is arranged on the machine base through sliding rails and a main screw rod motor. A vice sliding plate is arranged on the main sliding plate through guide rails and a vice screw rod. An automatic chuck is arranged on the vice sliding plate through a rotating motor. A sliding seat is arranged on the main sliding plate on one side of the vice sliding plate through sliding rails. A rotating center is arranged on the sliding seat. The double-spiral trajectory precision grinding machine for automobile steering gear ball screw solves the problems of relatively poor grinding effect and low grinding precision when the oil stone is in a relatively fixed state to complete the spiral trajectory grinding work, and is especially suitable for the needs of double-spiral trajectory precision grinding of automobile steering gear ball screw.

Description

Technical Field

[0001] This invention relates to a precision grinding machine for the double helical trajectory of ball screws in automotive steering systems, belonging to the technical field of grinding equipment for automotive steering system ball screws. Background Technology

[0002] In the field of automotive steering gear ball screw manufacturing technology, after production, the double-helix trajectory of the ball screw needs to be polished using an oilstone. Existing ball screw polishing devices, such as the device for fine polishing disclosed in invention patent application CN104589161A, can meet the polishing needs to a certain extent. However, during operation, the oilstone remains relatively stationary. While it can polish the bottom of the helical trajectory, its polishing effect on the inner surface of the helical trajectory is relatively poor, resulting in low polishing precision. Therefore, it is necessary to develop a new fine polishing device to solve the above-mentioned problems of existing ball screw polishing methods. Summary of the Invention

[0003] The purpose of this invention is to provide a precision grinding machine for the double helical trajectory of ball screws in automotive steering systems, which is compact in structure and ingeniously designed to solve the problem of low grinding accuracy in existing ball screw grinding methods.

[0004] The technical solution of this invention is:

[0005] A precision grinding machine for the double-helix trajectory of ball screws in automotive steering systems includes a conveyor chain, a base, a transfer assembly, a gripping assembly, a grinding assembly, and a positioning assembly. The machine is characterized by: a base on one side of the conveyor chain; a main slide plate mounted on the base via a slide rail and a main screw motor; a secondary slide plate mounted on the main slide plate via a guide rail and a secondary screw; an automatic chuck mounted on the secondary slide plate via a rotary motor; a slide block mounted on the main slide plate on one side of the secondary slide plate via a slide rail; a rotating tip mounted on the slide block; a pressure sensor mounted on one side of the rotating tip via a bracket; one end of the rotating tip being in contact with the pressure sensor; a transfer assembly between the secondary slide plate and the slide block; a grinding assembly mounted above the transfer assembly; a positioning assembly on one side of the grinding assembly; and a gripping assembly mounted on the base at one end of the transfer assembly.

[0006] The transfer assembly includes a longitudinal slide, a lifting seat, a support positioning plate, a clamping cylinder, a drive motor, and a rack; the longitudinal slide is mounted above the main slide via a guide rail; a drive gear is mounted on the longitudinal slide via the drive motor; the drive gear is connected to a rack mounted on one side of the guide rail; a lifting seat is mounted on the longitudinal slide via a lifting cylinder; two sets of support positioning plates are symmetrically mounted on the lifting seat; two sets of clamping cylinders are symmetrically mounted between the two sets of support positioning plates.

[0007] The support positioning plate is symmetrically provided with two sets of V-shaped positioning ports.

[0008] The gripping assembly includes a gripping bracket, a transverse slide, gripping claws, a lifting cylinder, a lifting platform, and clamping claws; the gripping bracket is mounted on the base; the transverse slide is mounted on the gripping bracket via a guide rail, a rack, and a drive motor; the lifting platform is mounted on the transverse slide via a lifting cylinder; and multiple sets of clamping claws are symmetrically mounted at the lower end of the lifting platform.

[0009] The positioning assembly includes a positioning slide, a displacement sensor, a sensing slider, and a buffer spring. The positioning slide is mounted on the base via a pusher cylinder. A transmission rod is mounted on the positioning slide via a bearing seat. A displacement sensor is mounted on the positioning slide at one end of the transmission rod, and the displacement sensor is in contact with the transmission rod. A sensing slider is slidably mounted on the positioning slide at the other end of the transmission rod via a slide rail. One end of the sensing slider has a sensing thread. The other end of the sensing slider is fixedly connected to the transmission rod. A buffer spring is fitted onto the transmission rod between the sensing slider and the bearing seat.

[0010] The grinding assembly includes a mounting bracket, a oscillating grinder, a conical slide plate, and a vertical lead screw; the conical slide plate is slidably mounted on the base via the mounting bracket and guide rail; the conical slide plate is connected to the vertical lead screw mounted on the mounting bracket via a motor; the oscillating grinder is symmetrically mounted on the conical slide plate.

[0011] The swing grinder includes a shape change seat, a swing cylinder, a swing base, a slide cylinder, and an oilstone; the swing cylinder is mounted on the conical slide via the shape change seat; the swing base is mounted on the bottom of the swing cylinder; an assembly plate is mounted on the swing base via the slide cylinder; and an oilstone is installed at an angle on the bottom of the assembly plate.

[0012] One end of the oilstone is provided with a grinding arc.

[0013] The advantages of this invention are:

[0014] This precision grinding machine for the double helical trajectory of automotive steering gear ball screws has a compact structure and ingenious design. Its oilstone can perform precision grinding on the double helical trajectory during the swinging process, thereby solving the problem of relatively poor grinding effect and low grinding precision when the oilstone is in a relatively fixed state to complete the helical trajectory grinding work. It is particularly suitable for the needs of precision grinding of double helical trajectory of automotive steering gear ball screws. Attached Figure Description

[0015] Figure 1 This is a top view of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the present invention after removing the conveyor chain wire;

[0017] Figure 3 for Figure 2 A schematic diagram of the isometric structure in another direction;

[0018] Figure 4 for Figure 2 A schematic diagram of the isometric structure in another direction;

[0019] Figure 5 for Figure 2 Front view structural diagram;

[0020] Figure 6 for Figure 5 A top-view structural diagram;

[0021] Figure 7 for Figure 2 A schematic diagram of the structure after removing the grinding and positioning components;

[0022] Figure 8 This is a schematic diagram of the gripping component of the present invention;

[0023] Figure 9 This is a schematic diagram of the structure of the transfer component of the present invention;

[0024] Figure 10 This is a schematic diagram of the locking chuck and rotating tip of the present invention;

[0025] Figure 11 This is a schematic diagram of the rotating tip structure of the present invention;

[0026] Figure 12 This is a schematic diagram of the positioning component of the present invention;

[0027] Figure 13 for Figure 12 Enlarged structural diagram at point A;

[0028] Figure 14 This is a schematic diagram of the grinding component of the present invention;

[0029] Figure 15 for Figure 14 Front view structural diagram;

[0030] Figure 16 This is a schematic diagram of the structure of the oscillating grinder of the present invention;

[0031] Figure 17 for Figure 16 Front view structural diagram;

[0032] Figure 18 for Figure 17 A schematic diagram of the cross-sectional structure at point BB.

[0033] In the diagram: 1. Conveyor chain; 2. Base; 3. Main screw motor; 4. Main slide plate; 5. Secondary screw; 6. Secondary slide plate; 7. Automatic chuck; 8. Rotary motor; 9. Slide; 10. Rotating center; 11. Bracket; 12. Pressure sensor; 13. Transfer assembly; 14. Grinding assembly; 15. Positioning assembly; 16. Gripping assembly; 17. Longitudinal slide; 18. Drive motor; 19. Lifting cylinder; 20. Lifting seat; 21. Support positioning plate; 22. Clamping cylinder; 23. V-shaped positioning port; 24. 25. Grabbing bracket; 26. Lateral slide; 27. Lifting cylinder; 28. Lifting platform; 29. ​​Clamping claw; 30. Positioning slide; 31. Bearing seat; 32. Transmission rod; 33. Displacement sensor; 34. Inductive slider; 35. Inductive threaded port; 36. Buffer spring; 37. Mounting support; 38. Conical slide plate; 39. Vertical lead screw; 40. Swinging grinder; 41. Changing seat; 42. Swinging cylinder; 43. Swinging seat; 44. Slide cylinder; 45. Assembly plate; 46. Oilstone; 47. Grinding arc. Detailed Implementation

[0034] The precision grinding machine for the double-helix ball screw of the automotive steering gear includes a conveyor chain 1, a base 2, a transfer assembly 13, a gripping assembly 16, a grinding assembly 14, and a positioning assembly 15 (see the attached instruction manual). Figure 1 , 2 and 3).

[0035] The conveyor chain 1 is an externally purchased device. During operation, it can convey the workpiece (the ball screw of the automotive steering system) in a uniform manner.

[0036] A base 2 is installed on one side of the conveyor chain 1; the main slide plate 4 is mounted on the base 2 via a slide rail and a main screw motor 3 (see instruction manual appendix). Figure 2 When the main lead screw motor 3 is working, it can drive the main slide plate 4 to slide back and forth on the base 2 with the cooperation of the main lead screw.

[0037] The main slide plate 4 is equipped with a secondary slide plate 6 via a guide rail and a secondary lead screw 5; the secondary slide plate 6 is equipped with an automatic chuck 7 via a rotary motor 8 (see instruction manual appendix). Figure 10 During operation, the auxiliary lead screw 5 can push the auxiliary slide plate 6 to slide back and forth on the main slide plate 4.

[0038] A slide block 9 is mounted on the main slide block 4 on one side of the auxiliary slide block 6 via a slide rail; a rotating center 10 is mounted on the slide block 9 (see instruction manual appendix). Figure 10 When the slide 9 is subjected to force, it will drive the tip 10 to move on the main slide 4.

[0039] A pressure sensor 12 is mounted on one side of the rotating tip 10 via a bracket 11; one end of the rotating tip 10 is in contact with the pressure sensor 12. When the rotating tip 10 is subjected to force, it will drive the slide 9 to slide and press the pressure sensor 12, thus the force on the rotating tip 10 can be monitored through the pressure sensor 12.

[0040] A transfer assembly 13 is installed between the auxiliary slide plate 6 and the slide base 9 (see instruction manual). Figure 4 The transfer assembly 13 includes a longitudinal slide 17, a lifting seat 20, a support positioning plate 21, a clamping cylinder 22, a drive motor 18, and a rack (see the attached instruction manual). Figure 9 ).

[0041] A longitudinal slide block 17 is mounted above the main slide block 4 via a guide rail; a drive gear is mounted on the longitudinal slide block 17 via a drive motor 18; the drive gear is connected to a rack mounted on one side of the guide rail (see instruction manual appendix). Figure 9 When the drive motor 18 is working, it can drive the longitudinal slide 17 to slide back and forth along the guide rail in the longitudinal direction with the cooperation of the drive gear and rack.

[0042] A lifting seat 20 is mounted on the longitudinal slide 17 via a lifting cylinder 19; two sets of support positioning plates 21 are symmetrically mounted on the lifting seat 20; two sets of V-shaped positioning ports 23 are symmetrically arranged on the support positioning plates 21. Two sets of clamping cylinders 22 are symmetrically mounted between the two sets of support positioning plates 21 (see the instruction manual appendix). Figure 9 During operation, after placing the workpiece in the V-shaped positioning port 23 on the support positioning plate 21, the clamping cylinder 22 can clamp and fix the workpiece on the support positioning plate 21 (see the instruction manual appendix). Figure 9 ).

[0043] The base 2 at one end of the transfer component 13 is equipped with a gripping component 16 (see the instruction manual). Figure 4 The gripping assembly 16 includes a gripping bracket 24, a transverse slide 25, gripping claws, a lifting cylinder 26, a lifting platform 27, and clamping jaws 28 (see the attached instruction manual). Figure 8 ).

[0044] The base 2 is equipped with a gripping bracket 24; a transverse slide 25 is mounted on the gripping bracket 24 via a guide rail, rack and pinion and drive motor 18; a lifting platform 27 is mounted on the transverse slide 25 via a lifting cylinder 26; multiple sets of gripping claws 28 are symmetrically mounted at the lower end of the lifting platform 27 (see the instruction manual appendix). Figure 8 During operation, the gripper 28, in conjunction with the transverse slide 25, the lifting cylinder 26, and the lifting platform 27, can grasp the workpiece.

[0045] The grinding component 14 is mounted on top of the transfer component 13 (see instruction manual). Figure 2 and 3The grinding assembly 14 includes a mounting bracket 36, a oscillating grinder 39, a conical slide plate, and a vertical lead screw 38 (see the instruction manual appendix). Figure 14 and 15 A conical slide plate 37 is slidably mounted on the base 2 via a mounting bracket 36 and a guide rail; the conical slide plate 37 is connected to a vertical lead screw 38 mounted on the mounting bracket 36 via a motor (see the instruction manual appendix). Figure 14 and 15 When the vertical lead screw 38 is working, it can push the conical slide plate 37 to slide up and down along the machine base 2.

[0046] A oscillating polisher 39 is symmetrically mounted on the conical skateboard 37 (see instruction manual appendix). Figure 14 and 15 The oscillating grinder 39 includes a changing seat 40, an oscillating cylinder 41, an oscillating seat 42, a sliding table cylinder 43, and an oilstone 45 (see the instruction manual appendix). Figure 16 , 17 and 18).

[0047] A swing cylinder 41 is mounted on the conical slide plate 37 via a changing seat 40; a swing seat 42 is mounted on the bottom end of the swing cylinder 41 (see the instruction manual appendix). Figure 16 and 17 When the swing cylinder 41 is working, it can drive the swing seat 42 to swing back and forth within a certain range.

[0048] An assembly plate 44 is mounted on the swing seat 42 via a slide cylinder 43; an oilstone 45 is installed at an angle on the bottom of the assembly plate 44 (see instruction manual appendix). Figure 15 During operation, the slide cylinder 43, under the control of the pressure regulating valve, can control the oilstone 45 to have a certain pressure and make contact with the spiral ball screw of the workpiece.

[0049] One end of the oilstone 45 is provided with a grinding arc 46 (see instruction manual appendix). Figure 16 The arc of the polished opening 46 is consistent with the arc of the helical trajectory of the ball screw, so that the polished opening 46 and the helical trajectory of the ball screw can fit together during operation.

[0050] A positioning component 15 is provided on one side of the grinding component 14 (see the instruction manual). Figure 2 and 3 The positioning assembly 15 includes a positioning slide 29, a displacement sensor 32, a sensing slider 33, and a buffer spring 35 (see the attached instruction manual). Figure 12 and 13 ).

[0051] A positioning slide 29 is mounted on the base 2 via a pusher cylinder; a transmission rod 31 is mounted on the positioning slide 29 via a bearing seat 30; a displacement sensor 32 is mounted on the positioning slide 29 at one end of the transmission rod 31; the displacement sensor 32 is in contact with the transmission rod 31; a sensing slider 33 is slidably mounted on the positioning slide 29 at the other end of the transmission rod 31 via a slide rail; a sensing threaded opening 34 is provided at one end of the sensing slider 33; the other end of the sensing slider 33 is fixedly connected to the transmission rod 31; a buffer spring 35 is fitted on the transmission rod 31 between the sensing slider 33 and the bearing seat 30 (see the instruction manual appendix). Figure 12 and 13 ).

[0052] The precision grinding machine for the double helical trajectory of the ball screw of the automotive steering gear operates by having the gripping claw 28 of the gripping assembly 16 grip the workpiece to be inspected from the conveyor chain 1 after cooperating with the transverse slide 25, the lifting cylinder 26 and the lifting platform 27. The workpiece is then placed on the V-shaped positioning port 23 inside the support positioning plate 21 of the transfer assembly 13. Subsequently, the clamping cylinder 22 clamps and fixes the workpiece on the support positioning plate 21, and the gripping assembly 16 is reset.

[0053] After the clamping cylinder 22 clamps and fixes the workpiece onto the support positioning plate 21, the drive motor 18, in cooperation with the drive gear and rack, drives the longitudinal slide 17 to move along the guide rail toward the rotating center 10 in the longitudinal direction. When the longitudinal slide 17 moves the workpiece between the automatic chuck 7 and the rotating center 10, the longitudinal slide 17 stops moving.

[0054] Subsequently, the auxiliary lead screw 5 drives the auxiliary slide plate 6 to move towards the workpiece. After the auxiliary slide plate 6 drives the automatic chuck 7 to clamp and fix one end of the workpiece, the transfer assembly 13 resets. Then, the auxiliary slide plate 6 continues to move, causing the automatic chuck 7 to move the workpiece so that its other end abuts against the rotating center 10.

[0055] After the above work is completed, the positioning slide 29 on the positioning assembly 15 drives the sensing slider 33 to move towards the workpiece and make it contact the workpiece surface. At this time, the sensing slider 33, after being subjected to force, will overcome the elastic force of the buffer spring 35 and move backward a certain distance.

[0056] After the sensing slider 33 contacts the workpiece surface, the rotary motor 8 drives the workpiece to rotate through the automatic chuck 7 and the rotating center 10. During this process, the main lead screw motor 3 drives the main slide plate 4 to slide the workpiece to the left. When the sensing slider 33 contacts the double helical trajectory on the workpiece, it moves forward under the force of the buffer spring 35, at which point the sensing thread 34 contacts the double helical trajectory. Thus, the positioning component 15 can sense the position of the end of the double helical trajectory of the workpiece through the change in the displacement sensor 32. That is, the contact position between the end of the double helical trajectory and the sensing thread 34 of the sensing slider 33 is the zero point position.

[0057] After the positioning component 15 finds the zero point position, it resets. At this time, the vertical lead screw 38 of the grinding component 14 pushes the conical slide plate 37 down. When the oilstone 45 corresponds to the end of the workpiece's double helical trajectory, the stage cylinder 43, under the control of the pressure regulating valve, can control the oilstone 45 to have a certain pressure to contact and connect with the helical trajectory of the workpiece's ball screw. Subsequently, the swing cylinder 41 drives the oilstone 45 to swing left and right within the helical trajectory through the swing seat 42.

[0058] After the above process is completed, the main slide plate 4 drives the workpiece to slide to the left, while the automatic chuck 7 drives the workpiece to rotate with the help of the rotating center 10. In this way, the workpiece can move to the left during its rotation, and during this process, the oilstone 45 swings left and right in the spiral trajectory to complete the fine grinding work of the double spiral trajectory.

[0059] After the workpiece moves to its leftmost position and the oilstone 45 completes the double-helix ballistic fine grinding, the workpiece stops rotating, the grinding assembly 14 resets, and the main slide plate 4 resets. Then, the automatic chuck 7 moves the workpiece to the left, disengaging it from the rotating tip 10. Subsequently, the longitudinal slide 17 of the transfer assembly 13 moves below the workpiece and, with the cooperation of the lifting seat 20, the support positioning plate 21, and the clamping cylinder 22, clamps and fixes the workpiece onto the V-shaped positioning port 23 on the outside of the support positioning plate 21. Then, the automatic chuck 7 releases the workpiece and resets with the auxiliary slide plate 6. The transfer assembly 13 then moves the ground workpiece to below the gripping assembly 16. The gripping assembly 16 then grips the ground workpiece from the transfer assembly 13 and transfers it to the conveyor chain 1. Finally, the gripping assembly 16 grips the unprocessed workpiece from the conveyor chain 1 and transfers it to the transfer assembly 13. At this point, the precision grinding machine for the double helical ball screw of the automotive steering gear has completed the grinding work, and the precision grinding device can then enter the next working cycle.

[0060] This precision grinding machine for the double helical trajectory of automotive steering gear ball screws has a compact structure and ingenious design. Its oilstone 45 can perform precision grinding on the double helical trajectory during the swinging process, thereby solving the problem of relatively poor grinding effect and low grinding precision when the oilstone 45 is in a relatively fixed state to complete the helical trajectory grinding work. It is particularly suitable for the needs of precision grinding of double helical trajectory of automotive steering gear ball screws.

Claims

1. A precision grinding machine for the double-helix trajectory of a ball screw in an automotive steering gear, comprising a conveyor chain (1), a base (2), a transfer assembly (13), a gripping assembly (16), a grinding assembly (14), and a positioning assembly (15); characterized in that: A base (2) is provided on one side of the conveyor chain (1); a main slide plate (4) is mounted on the base (2) via a slide rail and a main screw motor (3); a secondary slide plate (6) is mounted on the main slide plate (4) via a guide rail and a secondary screw (5); an automatic chuck (7) is mounted on the secondary slide plate (6) via a rotary motor (8); a slide seat (9) is mounted on the main slide plate (4) on one side of the secondary slide plate (6) via a slide rail; a rotating tip (10) is mounted on the slide seat (9); a pressure sensor (12) is mounted on one side of the rotating tip (10) via a bracket (11); one end of the rotating tip (10) is in contact with the pressure sensor (12); a transfer assembly (13) is installed between the secondary slide plate (6) and the slide seat (9); a grinding assembly (14) is installed above the transfer assembly (13); a positioning assembly (15) is provided on one side of the grinding assembly (14); a gripping assembly (16) is mounted on the base (2) at one end of the transfer assembly (13). The positioning component (15) includes a positioning slide (29), a displacement sensor (32), a sensing slider (33), and a buffer spring (35). The positioning slide (29) is mounted on the base (2) via a push cylinder. A transmission rod (31) is mounted on the positioning slide (29) via a bearing seat (30). A displacement sensor (32) is mounted on the positioning slide (29) at one end of the transmission rod (31). The displacement sensor (32) is in contact with the transmission rod (31). A sensing slider (33) is slidably mounted on the positioning slide (29) at the other end of the transmission rod (31) via a slide rail. A sensing threaded port (34) is provided at one end of the sensing slider (33). The other end of the sensing slider (33) is fixedly connected to the transmission rod (31). A buffer spring (35) is fitted on the transmission rod (31) between the sensing slider (33) and the bearing seat (30). The polishing assembly (14) includes a mounting bracket (36), a swing polisher (39), a conical slide plate (37), and a vertical lead screw (38); the conical slide plate (37) is slidably mounted on the base (2) via the mounting bracket (36) and a guide rail; the conical slide plate (37) is connected to the vertical lead screw (38) mounted on the mounting bracket (36) via a motor; the swing polisher (39) is symmetrically mounted on the conical slide plate (37); The swing grinder (39) includes a change seat (40), a swing cylinder (41), a swing seat (42), a slide cylinder (43), and an oilstone (45); the swing cylinder (41) is mounted on the conical slide plate (37) via the change seat (40); the swing seat (42) is mounted on the bottom of the swing cylinder (41); the mounting plate (44) is mounted on the swing seat (42) via the slide cylinder (43); the oilstone (45) is installed at an angle on the bottom of the mounting plate (44).

2. The precision grinding machine for the double-helix trajectory of a ball screw in an automotive steering gear according to claim 1, characterized in that: The transfer assembly (13) includes a longitudinal slide (17), a lifting seat (20), a support positioning plate (21), a clamping cylinder (22), a drive motor, and a rack; the longitudinal slide (17) is mounted on the main slide plate (4) via a guide rail; a drive gear is mounted on the longitudinal slide (17) via a drive motor; the drive gear is connected to a rack mounted on one side of the guide rail; the lifting seat (20) is mounted on the longitudinal slide (17) via a lifting cylinder (19); two sets of support positioning plates (21) are symmetrically mounted on the lifting seat (20); two sets of clamping cylinders (22) are symmetrically mounted between the two sets of support positioning plates (21).

3. The precision grinding machine for the double-helix trajectory of an automotive steering gear ball screw according to claim 2, characterized in that: The support positioning plate (21) is symmetrically provided with two sets of V-shaped positioning ports (23).

4. The precision grinding machine for the double-helix trajectory of an automotive steering gear ball screw according to claim 1, characterized in that: The gripping assembly (16) includes a gripping bracket (24), a transverse slide (25), a lifting cylinder (26), a lifting platform (27), and gripping claws (28); the gripping bracket (24) is mounted on the base (2); the transverse slide (25) is mounted on the gripping bracket (24) via a guide rail, a rack and a drive motor; the lifting platform (27) is mounted on the transverse slide (25) via the lifting cylinder (26); multiple sets of gripping claws (28) are symmetrically mounted on the lower end of the lifting platform (27).

5. The precision grinding machine for the double-helix trajectory of a ball screw in an automotive steering gear according to claim 4, characterized in that: One end of the oilstone (45) is provided with a grinding arc (46).

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