Machining clamp for track pin bush

Abstract

The utility model provides a track pin bush machining clamp which comprises a chuck and a plurality of clamping jaws, the clamping jaws are connected with the chuck in the radial direction of the chuck, the end of each clamping jaw is provided with a clamping face for clamping a pin bush, and a limiting block which protrudes out of the clamping face and is used for abutting against the end face of the pin bush is arranged below the clamping face. A chip removal notch is formed in the end face of the limiting block. Scrap iron generated in the finish turning process of the pin bush inner hole is conveniently discharged, and the precision of the size of the pin bush inner hole is improved; the pin bush clamping and positioning precision is improved, and the length size of the pin bush is guaranteed; meanwhile, scrap iron residues on the clamping surfaces of the clamping jaws and the positioning table are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing, and particularly relates to a machining fixture for a track pin sleeve. Background Art

[0002] Track products are widely used in construction machinery such as excavators, bulldozers, rotary drilling rigs, etc. Track pin bushings are an important connector of combined crawler tracks. Their main function is to connect the crawler tracks and crawler wheels, transmit power and torque, and enable the crawler tracks to rotate and move normally. At the same time, the crawler pin bushings can also withstand loads and friction to protect the crawler tracks and crawler wheels from damage. Therefore, the dimensional accuracy of the pin bushings is crucial to the quality of the crawler tracks.

[0003] The processing procedures of the pin sleeve mainly include blanking, forging, fine turning, heat treatment, grinding, etc. Among them, the fine turning process is turning the end face of end I, outer chamfer, outer diameter, and inner hole chamfer of end I; turning the pin sleeve, rough and fine turning the inner hole, chamfering the inner hole of end II, turning the end face of end II, outer chamfer, and outer diameter. At present, the claws of the tooling fixtures used for machining track pin sleeves are short, and the workpiece positioning distance is close to the chuck. The iron filings generated during the fine turning of the inner hole are not easy to discharge and are easily entangled on the workpiece and the tool. It causes scratches on the inner hole of the workpiece, making the inner hole size unqualified; it blocks the water spray path, making it impossible for the tool tip to spray cutting fluid in time for cooling, resulting in damage to the tool tip and other problems. In addition, the workpiece positioning distance is close to the chuck. When the chuck rotates and blows air, the iron filings cannot be completely blown off, resulting in iron filings remaining on the clamping surface of the claws, resulting in a long cleaning time, which greatly affects production efficiency. In addition, the workpiece is positioned close to the chuck, and the bumps, deformations, and burrs on the front end of the blank will cause inaccurate clamping and positioning of the workpiece as the clamping surface, affecting the size and quality of the pin sleeve. Utility Model Content

[0004] In order to solve the problems in the above-mentioned prior art, the utility model provides a track pin sleeve machining fixture. The purpose of the utility model is to facilitate the discharge of iron chips generated during the fine turning of the inner hole of the pin sleeve, improve the accuracy of the size of the inner hole of the pin sleeve; improve the clamping and positioning accuracy of the workpiece, ensure the length size of the pin sleeve; reduce the residual iron chips on the clamping surface of the claw and the positioning table, and improve production efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides a track pin sleeve machining fixture, including a chuck and a plurality of claws, wherein the plurality of claws are connected to the chuck along the radial direction of the chuck, the claws include a connecting portion connected to the chuck and a clamping portion, the clamping portion is provided with a clamping surface, a limit block is provided below the clamping surface and protrudes outward from the clamping surface for abutting against the end face of the pin sleeve, and the end face of the limit block is provided with a chip removal notch.

[0006] Furthermore, the chuck is provided with a plurality of sliders arranged along its radial direction, the bottom surface of the connecting portion of the clamping claw is provided with a guide groove sleeved on the slider, and the clamping claw is fixed to the slider by a fastener.

[0007] Furthermore, the clamping claw is L-shaped, the connecting portion and the clamping portion are perpendicular to each other, and a compatible groove is provided between the clamping surface and the limit block.

[0008] Furthermore, when the limit block abuts against the end surface of the pin sleeve, the edge of the chip removal notch is located between the outer diameter and the inner hole of the pin sleeve.

[0009] Furthermore, a through hole connected to the guide groove is provided on the connecting portion of the clamping claw, a threaded hole corresponding to the through hole is provided on the upper surface of the sliding block, and the clamping claw is fixed to the sliding block by a fastener.

[0010] Furthermore, the number of the sliding blocks is three, and the sliding blocks are arranged on the surface of the chuck so as to slide radially along the chuck at the same central angle.

[0011] Furthermore, the slide block is connected to a hydraulic system, and the hydraulic system pushes the slide block to drive the clamping claw to move toward the center of the chuck to achieve clamping of the pin sleeve.

[0012] Compared with the prior art, the track pin sleeve machining fixture of the utility model mainly has the following advantages:

[0013] 1. The end face of the limit block of the utility model is provided with a chip removal notch. When the limit block abuts against the end face of the pin sleeve, the edge of the chip removal notch is located between the outer diameter and the inner hole of the pin sleeve. The iron chips generated during the fine turning process of the inner hole of the pin sleeve can be discharged from the chip removal notch, avoiding the accumulation of iron chips generated during the fine turning process and winding around the inner hole of the pin sleeve or the tool, causing scratches on the inner hole of the pin sleeve, thereby improving the accuracy of the inner hole size of the pin sleeve;

[0014] 2. The clamping claw of the utility model is L-shaped, so that the pin sleeve is positioned farther from the chuck. When turning the inner hole of the pin sleeve, iron chips are easy to be discharged, and the rotating air blowing of the chuck makes it easier to blow off the iron chips, reducing the cleaning time and greatly improving the production efficiency;

[0015] 3. A compatible groove is also provided between the clamping surface and the limit block of the utility model, and the compatible groove is recessed inward from the clamping surface; when the claw clamps the pin sleeve, the clamping surface is clamped in the middle position of the pin sleeve, and the front part of the pin sleeve is located at the compatible groove, so that the position of the bump, deformation and burr on the outer circle of the front part of the pin sleeve is not used as the clamping surface, ensuring that the cylindrical degree of the pin sleeve meets the design requirements, avoiding inaccurate clamping and positioning of the pin sleeve, and affecting the size and quality of the pin sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the track pin sleeve machining fixture of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the clamping claw of the utility model;

[0018] In the figure: 1. pin sleeve; 2. chuck; 3. claw; 4. slide block; 5. fastener; 31. clamping surface; 32. compatible groove; 33. limit block; 34. chip removal notch; 35. chip removal channel; 36. guide groove. DETAILED DESCRIPTION

[0019] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown, a track pin sleeve machining fixture includes a chuck 2 and a plurality of claws 3. The plurality of claws 3 are connected to the chuck 2 along the radial direction of the chuck 2. The chuck 2 drives the claws 3 to move toward the middle to clamp the pin sleeve 1. The claws 3 are L-shaped. The claws 3 include a connecting portion connected to the chuck and a clamping portion for clamping the pin sleeve 1. The clamping portion is provided with a clamping surface 31 for clamping the pin sleeve 1. A limit block 33 protruding outward from the clamping surface 31 and used to abut against the end face of the pin sleeve 1 is provided below the clamping surface 31. The end face of the limit block 33 is provided with a chip removal notch 34. Iron chips generated in the inner hole of the pin sleeve 1 during the fine turning process can be discharged from the chip removal notch 34 to prevent the iron chips generated in the fine turning process from accumulating and winding around the inner hole of the pin sleeve 1 or the tool, causing scratches on the inner hole of the pin sleeve 1, thereby affecting the size of the inner hole of the pin sleeve 1.

[0021] Specifically, the surface of the chuck 2 is provided with three sliders 4 which are slidably connected with the chuck 2 along the radial direction of the chuck 2 at the same central angle, the sliders 4 are connected with the hydraulic system, the bottom surface of the connecting portion of the claw 3 is provided with a guide groove 36 which is sleeved on the slider 4 and cooperates with the slider 4, the claw 3 is provided with a through hole connected to the guide groove 36, the upper surface of the slider 4 is provided with a threaded hole corresponding to the through hole, and the claw 3 is fixed to the slider 4 by a fastening bolt. The hydraulic system pushes the slider 4 to drive the claw 3 to move toward the center of the chuck 2 to clamp the pin sleeve 1.

[0022] In some embodiments, a guide groove 36 is provided at the bottom of the claw 3 and is sleeved on the slider 4 and cooperates with the slider 4. The guide groove 36 is rectangular or dovetail-shaped.

[0023] like Figure 2As shown, in some embodiments, the clamping surface 31 is preferably arc-shaped, so as to match the outer circular shape of the pin sleeve, so as to ensure a close fit between the two and reduce the risk of looseness or misalignment. A limit block 33 is provided below the clamping surface 31 and protrudes outward from the clamping surface 31 to abut against the end face of the pin sleeve 1. The limit block 33 extends outward to support the end face of the pin sleeve 1 to achieve axial positioning of the pin sleeve 1 and ensure that the verticality of the end face of the pin sleeve 1 meets the design requirements. A chip removal notch 34 is provided on the end face of the limit block 33, and the chip removal notch 34 is preferably an arc-shaped notch; when the limit block 33 abuts against the end face of the pin sleeve 1, the edge of the chip removal notch 34 is located between the outer diameter and the inner hole of the pin sleeve 1. Below the limit block 33 is a chip removal channel 35. Iron chips generated in the inner hole of the pin sleeve 1 during the fine turning process can enter the chip removal channel 35 from the chip removal notch 34 and be discharged from the chip removal channel 35, thereby preventing the iron chips generated in the fine turning process from accumulating and entangled on the inner hole of the pin sleeve 1 or the tool, causing scratches on the inner hole of the pin sleeve 1, thereby affecting the size of the inner hole of the pin sleeve 1.

[0024] In addition, the clamping claw 3 is L-shaped, and the clamping surface 31 is located at the end of the clamping part, so that the pin sleeve 1 is positioned farther away from the chuck 2. When turning the inner hole of the pin sleeve 1, iron chips are easy to be discharged, and the rotating air blowing of the chuck 2 makes it easier to blow off the iron chips, thereby reducing the cleaning time and greatly improving the production efficiency.

[0025] In some embodiments, a compatible groove 32 is further provided between the clamping surface 31 and the limit block 33, and the compatible groove 32 is recessed inward from the clamping surface 31; when the claw 3 clamps the pin sleeve 1, the clamping surface 31 is clamped in the middle position of the pin sleeve 1, and the front part of the pin sleeve 1 is located at the compatible groove 32, so that the position of the bumps, deformations, and burrs on the outer circle of the front part of the pin sleeve 1 is not used as the clamping surface, ensuring that the cylindricity of the pin sleeve 1 meets the design requirements, avoiding inaccurate clamping and positioning of the pin sleeve 1, and affecting the size quality of the pin sleeve 1.

[0026] It is understood that what is described in the specific implementation is only one embodiment of the present invention, and those skilled in the art may make various changes or equivalent substitutions to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the guidance of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A track pin sleeve machining fixture, comprising a chuck (2) and a plurality of claws (3), wherein the plurality of claws (3) are connected to the chuck (2) along a radial direction of the chuck (2), characterized in that: The clamping claw (3) comprises a connecting portion connected to the chuck and a clamping portion, the clamping portion being provided with a clamping surface (31), a limit block (33) being provided below the clamping surface (31) and protruding outwardly from the clamping surface (31) and being used to abut against the end surface of the pin sleeve (1), and a chip removal notch (34) being provided on the end surface of the limit block (33).

2. The track pin sleeve machining fixture according to claim 1, characterized in that: The chuck (2) is provided with a plurality of sliders (4) arranged along its radial direction, the bottom surface of the connecting portion of the clamping claw (3) is provided with a guide groove (36) sleeved on the slider (4), and the clamping claw (3) is fixed to the slider (4) by a fastener (5).

3. The track pin sleeve machining fixture according to claim 1, characterized in that: The clamping claw (3) is L-shaped, the connecting portion and the clamping portion are perpendicular to each other, and a compatible groove (32) is provided between the clamping surface (31) and the limiting block (33).

4. The track pin sleeve machining fixture according to claim 3, characterized in that: When the limit block (33) abuts against the end surface of the pin sleeve (1), the edge of the chip removal notch (34) is located between the outer diameter and the inner hole of the pin sleeve (1).

5. The track pin sleeve machining fixture according to claim 2, characterized in that: A through hole communicating with the guide groove (36) is provided on the connecting portion of the clamping claw (3), a threaded hole corresponding to the through hole is provided on the upper surface of the sliding block (4), and the clamping claw (3) is fixed to the sliding block (4) by a fastener (5).

6. The track pin bushing machining fixture according to claim 2, characterized in that: The number of the sliding blocks (4) is three, and they are arranged on the surface of the chuck (2) so as to slide radially along the chuck (2) at the same central angle.

7. The track pin bushing machining fixture according to claim 2, characterized in that: The slide block (4) is connected to a hydraulic system, and the hydraulic system pushes the slide block (4) to drive the clamping claw (3) to move toward the center of the chuck (2), thereby clamping the pin sleeve (1).

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