A precision abrasive belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction

Abstract

The present invention belongs to the field of abrasive belt grinding technology. Currently, the grinding method for gears is usually grinding with a grinding wheel, and the grinding direction is along the gear axis. Since the texture direction of most gear grinding is along the axis, this direction is sensitive to bending fatigue stress and easily causes bending fatigue fracture failure of the gear. Therefore, grinding along the gear tooth profile direction is selected. At the same time, due to the involute tooth profile of the gear, the tooth groove width corresponding to the part below the pitch circle to the root circle is small, and the general abrasive belt grinding mechanism is large in size and difficult to grind. If a particularly small abrasive belt grinding mechanism is used, the efficiency and performance cannot be guaranteed. Therefore, a precision abrasive belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction is proposed, which includes a workbench, a clamping device base is provided on the top of the workbench, a clamping device is provided on the clamping device base, and a rib is provided on the clamping device.

Description

Technical Field

[0001] The invention relates to the technical field of abrasive belt grinding, in particular to a precision abrasive belt grinding mechanism for grinding at a constant linear speed along a gear tooth profile direction. Background Art

[0002] Currently, gear grinding is typically performed with a grinding wheel, with the grinding direction being along the gear axis. Since the grain direction of most gear grinding is along the axis, this direction is sensitive to bending fatigue stress and can easily cause bending fatigue fracture failure. Therefore, grinding along the tooth profile is preferred.

[0003] Belt grinding is used and the grinding texture direction should be along the tooth profile direction. By comparing the grinding parameters of the two grinding methods of constant linear speed and constant angular speed, it is concluded that constant linear speed grinding is better than constant angular speed grinding.

[0004] Due to the involute tooth profile of the gear, the tooth groove width corresponding to the part below the pitch circle to the root circle is small, and the general belt grinding mechanism is large in size and difficult to grind. If a particularly small belt grinding mechanism is used, efficiency and performance cannot be guaranteed. Summary of the Invention

[0005] The purpose of the present invention is to realize the movement of grinding along the tooth profile direction of the workpiece; control the constant speed operation of the motor so that the abrasive belt can grind the workpiece at a constant linear speed; be able to process the involute gear according to a predetermined trajectory, and the texture direction of the gear grinding is along the tooth profile direction at this time. The effective radius of the contact wheel changes evenly, and the grinding linear speed remains unchanged, thereby improving the surface quality and working performance of the gear. A precision abrasive belt grinding mechanism for constant linear speed grinding along the tooth profile direction of the gear is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A precision abrasive belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction comprises a workbench, a clamping device base is provided on the top of the workbench, a clamping device is provided on the clamping device base, a rib is provided on the clamping device, a workpiece is fixed on the clamping device, a pushing mechanism is provided on the top of the workbench, a sliding platform is connected to the pushing mechanism, the sliding platform is slidably connected to the top of the workbench, a slide groove is provided on the top of the workbench, the sliding platform is slidably connected to the inner wall of the slide groove, and two support frames are provided on the top of the sliding platform. The same large cone wheel splint is provided on it, and two second deep groove ball bearings are fixedly installed on the inner side of the large cone wheel splint, and a driving wheel is rotatably installed between the two second deep groove ball bearings, and the driving wheel is connected to a driving mechanism, and a pneumatic push rod is connected to the large cone wheel splint, and the pneumatic push rod is connected to a connecting mechanism, and the connecting mechanism is connected to a small cone wheel splint, and two small cone wheel electric push rods are provided on the inner side of the small cone wheel splint, and the same contact wheel is rotatably installed between the two small cone wheel electric push rods, and the same sanding belt is connected to the outer side of the driving wheel and the contact wheel.

[0008] Preferably, the pushing mechanism includes a stepper motor, which is installed on the top of the workbench. An elastic coupling is installed on the output shaft of the stepper motor, and a screw is connected to the elastic coupling. A fixed side support seat is installed on the top of the workbench, and the screw is rotatably connected to the fixed side support seat.

[0009] Preferably, the outer side of the screw rod is threadedly connected to a nut, a screw rod nut bracket is installed on the outer side of the nut, and the screw rod nut bracket is fixedly connected to the bottom of the sliding platform.

[0010] Preferably, a screw rotation support plate is fixedly installed on the top of the workbench, and the end of the screw is rotatably connected to the screw rotation support plate.

[0011] Preferably, the driving mechanism includes a driving wheel motor, a flange coupling, a driving wheel shaft and a first deep groove ball bearing. The driving wheel motor is installed on the top of the sliding platform through a motor seat and is connected. The first deep groove ball bearing is installed on the top of the sliding platform and is connected. The driving wheel shaft is connected to the inner ring of the first deep groove ball bearing. The front end of the driving wheel shaft is connected to the driving wheel. The flange coupling is connected between the output shaft of the driving wheel motor and the driving wheel shaft.

[0012] Preferably, the connecting mechanism includes a connecting device, which is a cross-plate structure. Positioning pins are provided on both sides of the connecting device, and the positioning pins on both sides are respectively connected to the pneumatic push rod and the small cone wheel clamp.

[0013] Preferably, two hydraulic cylinders are provided on the top of the sliding platform for rotation via an axle pin, bolts are provided between the two hydraulic cylinders and the sliding platform, and the output shafts of the two hydraulic cylinders are connected to the bottom angle adjustment of the connecting device.

[0014] In the present invention, the beneficial effects of the precision belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction are:

[0015] Since the texture direction of most gear grinding is along the axis, which is sensitive to bending fatigue stress and easily causes bending fatigue fracture failure of gears, grinding along the tooth profile direction is selected;

[0016] In this solution, the stepper motor drives the screw to rotate through an elastic coupling, the screw drives the screw nut to move, the screw nut drives the screw nut bracket to move, and the screw nut bracket drives the slide table to move and approach the workpiece, so that the contact wheel approaches the workpiece. By adjusting the position of the abrasive belt, the processing of workpieces of different sizes is mainly achieved by uniformly changing the effective radius of the contact wheel. The adjustment of the position of the abrasive belt is mainly to achieve a better position for processing;

[0017] This solution uses a hydraulic cylinder to push the connecting device, drive the contact wheel angle adjustment, can drive the sanding belt angle adjustment, can adjust the processing inclination angle, use a pneumatic push rod to push the connecting device and transmit the force to the contact wheel, the contact wheel drives the sanding belt to squeeze the workpiece, can adjust the squeezing force on the workpiece, and thus adjust the processing force;

[0018] The present invention realizes the movement of grinding along the tooth profile direction of the workpiece; controls the constant speed operation of the motor so that the sanding belt can grind the workpiece at a constant linear speed; can process the involute gear according to a predetermined trajectory, the texture direction of the gear grinding is along the tooth profile direction at this time, the effective radius of the contact wheel changes evenly, and the grinding linear speed remains unchanged, thereby improving the surface quality and working performance of the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A top view of a precision abrasive belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction proposed by the present invention;

[0020] Figure 2 This is a right-side structural schematic diagram of a precision abrasive belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction proposed by the present invention;

[0021] Figure 3 This is a side structural schematic diagram of the workbench, drive wheel motor, drive wheel shaft, drive wheel, support frame and sliding platform proposed in the present invention.

[0022] In the figure: 1. Connecting device; 2. Bolt; 3. Locating pin; 4. Small cone wheel clamp; 5. Small cone wheel electric push rod; 6. Contact wheel; 7. Clamping device base; 8. Rib; 9. Driving wheel motor; 10. Flange coupling; 11. Driving wheel shaft; 12. First deep groove ball bearing; 13. Large cone wheel clamp; 14. Driving wheel; 15. Elastic coupling; 16. Stepper motor; 17. Fixed side support seat; 18. Second deep groove ball bearing; 19. Workbench; 20. Workpiece; 21. Clamping device; 22. Hydraulic cylinder; 23. Abrasive belt; 24. Pneumatic push rod; 25. Screw; 26. Screw nut; 27. Screw nut bracket; 28. Screw rotation support plate; 29. ​​Support frame; 30. Sliding table. DETAILED DESCRIPTION

[0023] The technical solution of this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of this embodiment, rather than all the embodiments.

[0024] Reference Figure 1-3 , a precision belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction, including a workbench 19, a clamping device base 7 is provided on the top of the workbench 19, a clamping device 21 is provided on the clamping device base 7, a rib 8 is provided on the clamping device 21, the clamping device 21 is a clamping cylinder, which fixes the workpiece 20 through the clamping cylinder, and the workpiece 20 is fixed on the clamping device 21, a pushing mechanism is provided on the top of the workbench 19, and a sliding table 30 is connected to the pushing mechanism, and the sliding table 30 is slidably connected to the top of the workbench 19, and a slide groove is provided on the top of the workbench 19, and the sliding table 30 is slidably connected to the inner wall of the slide groove, and two support frames 29 are provided on the top of the sliding table 30, and the same large cone wheel clamp 13 is provided on the two support frames 29, and two second deep groove ball bearings 18 are fixedly installed on the inner side of the large cone wheel clamp 13. 8 is rotatably installed between the driving wheel 14, and two second deep groove ball bearings 18 support the driving wheel 14. The driving wheel 14 is connected to a driving mechanism, and the large cone wheel clamping plate 13 is connected to a pneumatic push rod 24. The pneumatic device 24 between the two wheels, on the one hand, plays the role of connecting and supporting the contact wheel 6 assembly, and on the other hand, it is mainly to adjust the tension of the sanding belt 13. When the center distance of the two wheels changes, the effective working radius of the contact wheel needs to be adjusted. The pneumatic push rod 24 is connected to a connecting mechanism, and the connecting mechanism is connected to a small cone wheel clamping plate 4. Two small cone wheel electric push rods 5 are provided on the inner side of the small cone wheel clamping plate 4. The same contact wheel 6 is rotatably installed between the two small cone wheel electric push rods 5. The position of the contact wheel 6 can be adjusted according to the specific processing conditions through the small cone wheel electric push rods 5 on both sides. The driving wheel 14 and the outer side of the contact wheel 6 are connected to the same sanding belt 23.

[0025] In this embodiment, the pushing mechanism includes a stepper motor 16, which is installed on the top of the workbench 19. An elastic coupling 15 is installed on the output shaft of the stepper motor 16, and a screw 25 is connected to the elastic coupling 15. A fixed side support seat 17 is installed on the top of the workbench 19. The screw 25 is rotatably connected to the fixed side support seat 17. The outer side of the screw 25 is threadedly connected to a nut 26, and a screw nut bracket 27 is installed on the outer side of the nut 26. The screw nut bracket 27 is fixedly connected to the bottom of the sliding table 30; the stepper motor 16 drives the screw 25 to rotate through the elastic coupling 15, the screw 25 drives the screw nut 26 to move, the screw nut 26 drives the screw nut bracket 27 to move, and the screw nut bracket 27 drives the sliding table 30 to move and approach the workpiece 20, so that the contact wheel 6 approaches the workpiece 20 and the position can be adjusted.

[0026] In this embodiment, a screw rotation support plate 28 is fixedly installed on the top of the workbench 19, and the end of the screw 25 is rotatably connected to the screw rotation support plate 28; the screw rotation support plate 28 supports the screw 25 through a bearing.

[0027] In this embodiment, the driving mechanism includes a driving wheel motor 9, a flange coupling 10, a driving wheel shaft 11 and a first deep groove ball bearing 12. The driving wheel motor 9 is installed on the top of the sliding table 30 through a motor seat and is connected. The first deep groove ball bearing 12 is installed on the top of the sliding table 30 and is connected. The driving wheel shaft 11 is connected to the inner ring of the first deep groove ball bearing 12. The front end of the driving wheel shaft 11 is connected to the driving wheel 14. The flange coupling 10 is connected between the output shaft of the driving wheel motor 9 and the driving wheel shaft 11; the driving wheel motor 9 drives the driving wheel shaft 11 to rotate through the flange coupling 10, and the driving wheel shaft 11 drives the driving wheel 14 to rotate. The driving wheel 14 drives the sanding belt 23 to rotate through the cooperation of the contact wheel 6, and the workpiece can be ground by the sanding belt 23.

[0028] In this embodiment, the connecting mechanism includes a connecting device 1, which is a cross-plate structure. Positioning pins 3 are provided on both sides of the connecting device 1. The positioning pins 3 on both sides are respectively connected to the pneumatic push rod 24 and the small cone wheel clamp 4.

[0029] In this embodiment, two hydraulic cylinders 22 are provided on the top of the sliding table 30 through an axle pin rotation, and a bolt 2 is provided between the two hydraulic cylinders 22 and the sliding table 30. The output shafts of the two hydraulic cylinders 22 are connected to the bottom angle adjustment of the connecting device 1. The swing of the sanding belt 13 is controlled by the hydraulic cylinder 22. The hydraulic cylinder 22 moves in the vertical direction to make the entire mechanism swing around the driving wheel 14. The swing angle of the sanding belt 13 is the angle between the center line of the two wheels and the horizontal. The swing angle is related to the contact position of the sanding belt 13 and the gear 10.

[0030] Working principle: When in use, the workpiece 20 is placed on the outside of the clamping device 21. The workpiece 20 can be fixed by the clamping device 21 (which is a clamping cylinder that fixes the workpiece 20). The stepper motor 16 drives the screw 25 to rotate through the elastic coupling 15. The screw 25 drives the screw nut 26 to move. The screw nut 26 drives the screw nut bracket 27 to move. The screw nut bracket 27 drives the sliding table 30 to move and approach the workpiece 20, so that the contact wheel 6 approaches the workpiece 20. The drive wheel motor 9 is started, and the drive wheel motor 9 drives the drive wheel shaft 11 to rotate through the flange coupling 10. The driving wheel shaft 11 drives the driving wheel 14 to rotate, and the driving wheel 14 drives the sanding belt 23 to rotate through the cooperation of the contact wheel 6. The workpiece can be ground by the sanding belt 23. The adjustment radius position of the contact wheel 6 is 10-20 cm. The hydraulic cylinder 22 is used to push the connecting device 1 to drive the angle adjustment of the contact wheel 6, which can drive the angle adjustment of the sanding belt 23 and adjust the processing inclination angle. The pneumatic push rod 24 is used to push the connecting device 1 and transmit the force to the contact wheel 6. The contact wheel 6 drives the sanding belt 23 to squeeze the workpiece 20, and the squeezing force on the workpiece 20 can be adjusted, thereby adjusting the processing force.

[0031] The above is only a preferred specific implementation method of this embodiment, but the protection scope of this embodiment is not limited to this. Any technician familiar with this technical field can make equivalent replacements or changes based on the technical solution and inventive concept of this embodiment within the technical scope disclosed in this embodiment, and they should be covered by the protection scope of this embodiment.

Claims

1. A precision belt grinding mechanism for grinding at a constant linear speed along a gear tooth profile, comprising a workbench (19), a clamping device base (7) being provided on the top of the workbench (19), a clamping device (21) being provided on the clamping device base (7), a workpiece (20) being fixed on the clamping device (21), and characterized in that: The top of the workbench (19) is provided with a pushing mechanism, the pushing mechanism is connected to a sliding platform (30), the sliding platform (30) is slidably connected to the top of the workbench (19), the top of the sliding platform (30) is provided with two support frames (29), the two support frames (29) are provided with the same large cone wheel clamping plate (13), the inner side of the large cone wheel clamping plate (13) is fixedly installed with two second deep groove ball bearings (18), a driving wheel (14) is rotatably installed between the two second deep groove ball bearings (18), the driving wheel (14) is connected to the driving mechanism, the large cone wheel clamping plate (13) is connected to a pneumatic push rod (24), the pneumatic push rod (24) is connected to a connecting mechanism, the connecting mechanism is connected to a small cone wheel clamping plate (4), the inner side of the small cone wheel clamping plate (4) is provided with two The invention relates to a small cone wheel electric push rod (5), a contact wheel (6) is rotatably installed between the two small cone wheel electric push rods (5), a driving wheel (14) and an outer side of the contact wheel (6) are connected to the same sanding belt (23), the connecting mechanism includes a connecting device (1), both sides of the connecting device (1) are provided with positioning pins (3), the positioning pins (3) on both sides are respectively connected to the pneumatic push rod (24) and the small cone wheel clamp (4), the connecting device (1) is a cross plate structure, the top of the sliding platform (30) is provided with two hydraulic cylinders (22) through the rotation of the shaft pin, a bolt (2) is provided between the two hydraulic cylinders (22) and the sliding platform (30), and the output shafts of the two hydraulic cylinders (22) are connected to the bottom angle adjustment of the connecting device (1).

2. A precision belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction according to claim 1, characterized in that: The clamping device (21) is provided with ribs (8).

3. The precision belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction according to claim 1, characterized in that: The pushing mechanism comprises a stepping motor (16), the stepping motor (16) is mounted on the top of a workbench (19), an elastic coupling (15) is mounted on the output shaft of the stepping motor (16), a screw rod (25) is connected to the elastic coupling (15), a fixed side support seat (17) is mounted on the top of the workbench (19), and the screw rod (25) is rotatably connected to the fixed side support seat (17).

4. The precision belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction according to claim 3, characterized in that: The outer side of the screw rod (25) is threadedly connected to a nut (26), and a screw rod nut bracket (27) is installed on the outer side of the nut (26). The screw rod nut bracket (27) is fixedly connected to the bottom of the sliding platform (30).

5. The precision abrasive belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction according to claim 3, characterized in that: A screw rod rotation support plate (28) is fixedly installed on the top of the workbench (19), and the end of the screw rod (25) is rotatably connected to the screw rod rotation support plate (28).

6. The precision belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction according to claim 1, characterized in that: A slide groove is provided on the top of the workbench (19), and the sliding platform (30) is slidably connected to the inner wall of the slide groove.

7. The precision belt grinding mechanism for constant linear speed grinding along the gear tooth profile direction according to claim 1, characterized in that: The driving mechanism comprises a driving wheel motor (9), a flange coupling (10), a driving wheel shaft (11) and a first deep groove ball bearing (12); the driving wheel motor (9) is mounted on the top of the sliding platform (30) and connected via a motor seat; the first deep groove ball bearing (12) is mounted on the top of the sliding platform (30) and connected; the driving wheel shaft (11) is connected to the inner ring of the first deep groove ball bearing (12); the front end of the driving wheel shaft (11) is connected to the driving wheel (14); and the flange coupling (10) is connected between the output shaft of the driving wheel motor (9) and the driving wheel shaft (11).

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