Hobbing clamp

Abstract

The gear hobbing clamp comprises a clamp body, a pull rod and an expansion sleeve, the pull rod is axially connected into the clamp body in a sliding mode, the expansion sleeve is connected to the end portion of the pull rod in a sleeved mode, the end portion of the pull rod is provided with a driving end driving the expansion sleeve to deform and expand a workpiece, and the outer wall of the clamp body is provided with a conical face used for abutting against an opening in the end face of the workpiece. By arranging the conical surface abutting against the opening of the end face of the workpiece on the clamp body, when the expansion sleeve expands the workpiece from the inside in actual use, the conical surface can well and effectively support the end of the workpiece, and the situation that the concentricity of the workpiece is affected due to deformation when the expansion sleeve expands and fixes the workpiece is reduced; and the concentricity and the subsequent machining precision can be better guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of clamps, and in particular to a gear hobbing clamp. Background Technology

[0002] A gear hobbing fixture is a tool used in gear hobbing to clamp a workpiece and maintain its correct position and orientation relative to the hobbing cutter and machine tool. It enables precise positioning and reliable clamping of the workpiece, ensuring that the workpiece meshes with the hobbing cutter according to a predetermined motion trajectory during the hobbing process, thereby producing gear teeth that meet the required precision.

[0003] In actual production and processing, we may encounter workpieces like gear bushings. When the wall thickness of the gear bushing is relatively thin, a gear hobbing fixture is used to clamp and fix it. After clamping, the gear bushing is prone to slight deformation, which can lead to a deviation in the concentricity of the two ends, affecting the accuracy of subsequent processing. This needs further improvement. Utility Model Content

[0004] To further ensure concentricity and machining accuracy, this application provides a gear hobbing fixture.

[0005] This application provides a gear hobbing fixture, which adopts the following technical solution:

[0006] A gear hobbing fixture includes a fixture body, a pull rod, and a tension sleeve. The pull rod is axially slidably connected inside the fixture body, and the tension sleeve is sleeved on the end of the pull rod. The end of the pull rod has a driving end that drives the tension sleeve to deform and tighten. The outer wall of the fixture body is provided with a conical surface for abutting against the opening of the end face of the workpiece.

[0007] Optionally, the drive end is tapered and its outer diameter gradually increases from one end near the pull rod to the other end. The outer wall of the drive end forms a first inclined surface, and the inner wall of the expansion sleeve has a second inclined surface that abuts and matches the first inclined surface.

[0008] Optionally, it also includes a connecting rod, one end of which is threadedly connected and fixed to the pull rod, and the connecting rod is axially slidably connected within the clamping body.

[0009] Optionally, it also includes a base and a base, with the two ends of the base connected to the base and the clamping body, and a connecting seat axially slidably connected inside the base, one end of the connecting seat being threadedly connected to the connecting rod.

[0010] Optionally, a limiting seat can be detachably connected to the base, and an elastic element connecting the limiting seat and the connecting seat is provided.

[0011] Optionally, the elastic element includes a spring, with its two ends abutting against the connecting seat and the limiting seat, respectively.

[0012] Optionally, the clamp body has a radial limiting hole, and the connecting seat has a limiting groove corresponding to the limiting hole. A limiting pin is inserted into the limiting hole, and the end of the limiting pin is inserted into the limiting groove and slidably connected thereto.

[0013] Optionally, the clamping body is detachably connected to an abutment sleeve, and the conical surface is disposed on the abutment sleeve.

[0014] Optionally, the abutment sleeve is threaded onto the clamp body.

[0015] Optionally, the limiting seat is provided with a groove for connecting and installing one end of the spring.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. By setting a conical surface on the fixture body to abut the opening of the workpiece end face, the conical surface can provide good and effective support for the end of the workpiece when the expansion sleeve tightens the workpiece from the inside in actual use. This reduces the situation where the concentricity of the workpiece end is affected by deformation when the expansion sleeve tightens and fixes the workpiece, and can better ensure concentricity and subsequent machining accuracy.

[0018] 2. The connecting rod and the pull rod are connected by threads to achieve separate adjustment. This avoids the pull rod being too long, which would reduce production difficulty. On the other hand, the total length can be adjusted by rotation, thus meeting the needs of more different occasions and having better applicability.

[0019] 3. The elastic element can act as a buffer and a reset aid, making the axial movement of the tie rod more stable.

[0020] 4. The design of the limiting hole and limiting groove, with the help of the limiting pin, can circumferentially limit the pull rod and the connecting rod, ensuring that the pull rod can only move stably in the axial direction, and avoid the pull rod from rotating during use, which would affect the use effect. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of Example 1.

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0023] Figure 3 This is an overall structural diagram of Example 2.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Clamp body; 2. Base; 3. Base; 4. Expansion sleeve; 5. Tie rod; 6. Workpiece; 7. Conical surface; 8. Drive end; 9. First inclined surface; 10. Second inclined surface; 11. Connecting rod; 12. Connecting seat; 13. Slide groove; 14. Limiting seat; 15. Elastic element; 16. Groove; 17. Limiting hole; 18. Limiting groove; 19. Upper center; 20. Abutment sleeve. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0027] Example 1

[0028] A gear hobbing clamp, such as Figures 1-2 As shown, the fixture includes a clamping body 1, a base 2, a base 3, a tension sleeve 4, and a pull rod 5. The clamping body 1 and the base 3 are detachably connected to both ends of the clamping body 1 by screws. The pull rod 5 is axially slidably connected inside the clamping body 1. One end of the pull rod 5 extends out of the clamping body 1 and is used to extend into the workpiece 6. The tension sleeve 4 is sleeved on the end of the pull rod 5 that extends out of the clamping body 1 and is used to extend into the workpiece 6 to tighten and fix it. In addition, a conical surface 7 is provided on the end of the clamping body 1 to abut against the opening of the end face of the workpiece 6. The conical surface 7 effectively supports the opening of the end face of the workpiece 6 and maintains its centering effect.

[0029] By setting a conical surface 7 on the fixture body 1 to abut the end face opening of the workpiece 6, the conical surface 7 can provide good and effective support for the end of the workpiece 6 when the expansion sleeve 4 tightens the workpiece 6 from the inside in actual use. This reduces the impact on the concentricity of the end of the workpiece 6 due to deformation when the expansion sleeve 4 tightens and fixes the workpiece 6, and can better ensure concentricity and subsequent machining accuracy. In actual use, the end face opening of the workpiece 6 also has a certain taper to better match the conical surface 7.

[0030] like Figures 1-2 As shown, the end of the pull rod 5 that protrudes from the clamping body 1 has a driving end 8. The driving end 8 is conical and its outer diameter gradually increases from one end near the pull rod 5 to the other end. A first inclined surface 9 is formed on the outer wall of the driving end 8. The inner wall of the expansion sleeve 4 has a second inclined surface 10 that abuts and matches the first inclined surface 9. In this way, after the workpiece 6 is sleeved on the expansion sleeve 4, the pull rod 5 is driven to move axially. By sliding the first inclined surface 9 and the second inclined surface 10 of the driving end 8, the expansion sleeve 4 is driven to deform and expand outward. Finally, the workpiece 6 is clamped and fixed by the expansion sleeve 4. The structure is simple and the operation is convenient.

[0031] like Figures 1-2As shown, a connecting rod 11 is axially slidably connected inside the end of the clamping body 1 away from the workpiece 6. One end of the connecting rod 11 is threadedly connected to the pull rod 5 for fixation. A connecting seat 12 is axially slidably connected inside the base 2. The end of the connecting rod 11 away from the pull rod 5 is threadedly connected to the connecting seat 12. The end of the connecting seat 12 away from the connecting rod 11 is used to connect to the drive source set inside the base 3. The drive source drives the connecting seat 12 to move axially. The drive source can be a hydraulic cylinder. The hydraulic cylinder drives the connecting seat 12 to move axially, thereby driving the pull rod 5 to move axially, and finally achieving the clamping and loosening of the workpiece 6.

[0032] The connecting rod 11 and the pull rod 5 are connected by a thread to achieve separate adjustment. This avoids the pull rod 5 from being too long, which would reduce the difficulty of production. On the other hand, the total length can be adjusted by rotation, which can meet the needs of more different occasions and has better applicability.

[0033] like Figures 1-2 As shown, the base 2 has a sliding groove 13 inside for the connecting seat 12 to slide. One end of the sliding groove 13 passes through the end of the base 2 away from the clamping body 1 and forms an opening. A limiting seat 14 adapted to the opening is provided. The limiting seat 14 and the connecting seat 12 are detachably connected. In this embodiment, the limiting seat 14 and the connecting seat 12 are fixed by screws. An elastic element 15 connecting the connecting seat 12 and the limiting seat 14 is provided. The elastic element 15 includes a spring. The two ends of the spring abut against the limiting seat 14 and the connecting seat 12 respectively. The spring can play a role in buffering and resetting during the axial movement of the connecting seat 12, so that the axial movement of the connecting seat 12 has better stability and reduces the impact phenomenon. In addition, a groove 16 adapted to the spring is opened on one side of the limiting seat 14. The design of the groove 16 improves the installation stability of the spring and the position of the spring is not easy to shift.

[0034] like Figures 1-2 As shown, a limiting hole 17 is radially opened on the clamp body 1, and a limiting groove 18 is opened on the connecting rod 11 at the corresponding limiting hole 17. The length direction of the limiting groove 18 is set along the axial direction. A limiting pin is used to pass through the limiting hole 17. The end of the limiting pin is inserted into the limiting groove 18 and slides with it. In this way, the limiting pin can play a circumferential limiting role for the connecting rod 11 and the pull rod 5, ensuring that the pull rod 5 can only move stably in the axial direction, and avoiding the pull rod 5 from rotating during use and affecting the use effect.

[0035] Example 2

[0036] A gear hobbing clamp, such as Figure 3 As shown, the difference between it and Embodiment 1 is that it also includes an upper center 19, the end of which is used to abut the end of the workpiece 6 away from the clamping body 1, so as to achieve good centering of the workpiece 6.

[0037] like Figure 3 As shown, in this embodiment, an abutment sleeve 20 is detachably connected to the end of the clamp body 1, and a conical surface 7 is disposed on the abutment sleeve 20. In actual use, the position of the conical surface 7 can be adjusted by rotating the abutment sleeve 20, thereby adjusting the magnitude of the supporting force on the workpiece 6, which can meet the needs of more application scenarios, and the adjustment operation is simple and convenient.

[0038] like Figure 3 As shown, in this embodiment, the open threaded connection between the limiting seat 14 and the connecting seat 12 enables detachment. An operating hole can be provided on the limiting seat 14 to drive it to rotate, facilitating quick assembly and disassembly. In addition, the position can be adjusted by rotating the limiting seat 14, thereby adjusting the magnitude of the spring buffer force, so that the spring can achieve a better and more effective elastic force effect.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hobbing fixture, characterized by: It includes a clamp body (1), a pull rod (5) and a sleeve (4), the pull rod (5) is axially slidably connected in the clamp body (1), the sleeve (4) is sleeved on the end of the pull rod (5), the end of the pull rod (5) has a driving end (8) for driving the sleeve (4) to deform and tighten the workpiece (6), and the outer wall of the clamp body (1) is provided with a tapered surface (7) for abutting the end face opening of the workpiece (6).

2. A hobbing fixture according to claim 1, wherein: The driving end (8) is tapered and gradually increases in outer diameter from one end to the other end of the pull rod (5), the outer wall of the driving end (8) forms a first inclined surface (9), and the inner wall of the sleeve (4) has a second inclined surface (10) matched with the first inclined surface (9).

3. A hobbing fixture according to claim 2, wherein: It also includes a connecting rod (11), one end of the connecting rod (11) is threadedly connected and fixed with the pull rod (5), and the connecting rod (11) is axially slidably connected in the clamp body (1).

4. A hobbing fixture according to claim 3, wherein: It also includes a base (2) and a base (3), both ends of the base (2) are connected with the base (3) and the clamp body (1), and the base (2) is axially slidably connected with a connecting seat (12), one end of the connecting seat (12) is threadedly connected with the connecting rod (11).

5. A hobbing fixture according to claim 4, wherein: A limiting seat (14) is detachably connected on the base (2), and an elastic member (15) connecting the two is arranged between the limiting seat (14) and the connecting seat (12).

6. A hobbing fixture according to claim 5, wherein: The elastic member (15) includes a spring, and the two ends of the spring abut the connecting seat (12) and the limiting seat (14) respectively.

7. A hobbing fixture according to claim 3, wherein: A radial limiting hole (17) is formed on the clamp body (1), a limiting groove (18) is formed on the connecting rod (11) corresponding to the limiting hole (17), a limiting pin is arranged in the limiting hole (17), and the end of the limiting pin is inserted into the limiting groove (18) and slidably connected with the limiting groove (18).

8. A hobbing fixture according to claim 1, wherein: A abutting sleeve (20) is detachably connected on the clamp body (1), and the tapered surface (7) is arranged on the abutting sleeve (20).

9. A hobbing fixture according to claim 8, wherein: The abutting sleeve (20) is threadedly connected on the clamp body (1).

10. A hobbing fixture according to claim 6, wherein: A groove (16) is formed on the limiting seat (14) for connecting and installing one end of the spring.

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