A chip removal type gear shaping fixture

Abstract

The utility model relates to a chip removal type gear shaping fixture, which solves the technical problems that the existing gear shaping fixture is not conducive to chip removal, is easy to be mixed with iron chips, thus causing the gear shaping size to be unqualified or even the fixture and machine tool to be damaged, or the expansion sleeve has a small tightening range, low production change efficiency, and high production cost. The utility model includes a bonding expansion sleeve, a support seat, an upper pull rod, a fixture body, and a lower pull rod; the upper pull rod is fixedly connected to the lower pull rod; the fixture body is sleeved on the upper pull rod; the top of the upper pull rod is provided with a convex ring, and the top of the fixture body is provided with a hollow cylinder, and a gap is left between the two; the support seat is sleeved on the hollow cylinder and is fixedly connected to the fixture body; the upper end of the bonding expansion sleeve abuts against the convex ring, and the lower end abuts against the top of the hollow cylinder; the inner side of the bonding expansion sleeve is covered with non-metallic materials; the upper pull rod is provided with a pull rod chip removal channel that passes from the top to the outer wall; the fixture body is provided with a body chip removal channel corresponding to the pull rod chip removal channel; and a chip removal groove is provided on the top of the support seat.

Description

Technical Field

[0001] The utility model relates to a gear shaping fixture, in particular to a chip removal type gear shaping fixture. Background Art

[0002] Gear shaping is a common gear manufacturing process. The gear shaping fixture used in the process is used to ensure the precise position of the workpiece so that the machine tool can be accurately positioned.

[0003] However, gear shaping is often accompanied by the generation of iron chips, which not only affect the gear shaping accuracy, but also reduce the surface quality of the workpiece, and even damage the machine tool or gear shaping fixture. Existing gear shaping fixtures usually do not consider chip removal when designing, and various problems may occur due to the inclusion of iron chips. In addition, the tightening range of the expansion sleeve in the existing gear shaping fixture is small, making it difficult to be compatible with a variety of workpiece models. In actual production, when replacing gears of different specifications, the gear shaping fixture needs to replace multiple parts to adapt to the gears, resulting in low production efficiency, high production costs and high inventory costs.

[0004] In order to solve the problem that the gear-forming fixture is not conducive to chip removal, the Chinese patent with publication number CN210254563U discloses a gear-forming fixture with chip removal for internal hole expansion, including a positioning plate, an expansion sleeve, a mandrel and a pull rod; the positioning plate is fixedly arranged, and a countersunk hole is arranged on the top; the mandrel is arranged below the positioning plate, the middle part of the mandrel protrudes, the top of the protruding part is located at the countersunk hole of the positioning plate, the top of the protruding part is truncated, and the small end faces upward, and a chip removal tube is arranged inside the mandrel, one end of the chip removal tube is connected to the top of the protruding part of the mandrel, and the other end is connected to the outside of the mandrel, and the expansion sleeve is arranged between the mandrel and the positioning plate; the expansion sleeve is provided with a through hole to wrap the protruding part of the mandrel, and the inner diameter of the top of the through hole gradually decreases; the pull rod is arranged below the mandrel, and the pull rod is connected to the expansion sleeve, which can drive the expansion sleeve to move synchronously. The Chinese patent with publication number CN219004290U discloses a chip removal internal gear processing fixture, which solves the problem that the accumulation of debris has an adverse effect on the gear-forming process of the product. The key points of the technical solution are: it includes a lower die and an upper die, the workpiece is fixed on the third cavity of the upper die, and a first through hole is provided at the bottom of the third cavity. When chips are generated by gear insertion, they will enter the third cavity of the lower die through the first through hole. Since the axis of the first through hole points to the opening of the second through hole, the chips will be discharged from the second through hole.

[0005] Although the above patent preliminarily solves the problem of iron filings being difficult to clean in the two types of gear-shaping fixtures, its structure is relatively complex, the tightening range of the expansion sleeve is small, and the compatibility with different workpiece models is poor. Utility Model Content

[0006] The utility model aims to solve the technical problems that the existing gear shaping fixture is not conducive to chip removal, is easy to be mixed with iron chips, thus resulting in unqualified gear shaping dimensions or even damage to the fixture and machine tools, or the expansion sleeve has a small tightening range, low production change efficiency and high production cost, and provides a chip removal type gear shaping fixture.

[0007] In order to achieve the above purpose, the technical solutions provided by the utility model are as follows:

[0008] A chip removal type gear shaping fixture, comprising an expansion sleeve, a support seat, an upper pull rod, a fixture body and a lower pull rod;

[0009] One end of the lower pull rod is provided with a mounting column, which is used to connect with the hydraulic cylinder of the machine tool to provide the power for tensioning; Definition: The end of the lower pull rod connected with the hydraulic cylinder of the machine tool is the bottom end, the bottom end is located at the bottom, and the other end is the top end; the bottom end of the upper pull rod is fixedly connected with the top end of the lower pull rod;

[0010] The clamp body is sleeved on the upper pull rod; a convex ring is provided on the outer side of the top of the upper pull rod, and a hollow cylinder is provided on the top of the clamp body. The hollow cylinder extends axially to a position close to the convex ring and a gap is left between the convex ring to achieve tensioning;

[0011] The expansion sleeve is sleeved on the outside of the hollow cylinder and abuts against the convex ring; the support seat is sleeved on the hollow cylinder of the fixture body and is fixedly connected to the fixture body;

[0012] Its special features are:

[0013] The expansion sleeve is a bonding expansion sleeve, and its inner surface is a non-metallic material coating layer, which is used to achieve bonding cooperation with the convex ring and the outer wall of the top of the hollow cylinder, and to increase the expansion range of the expansion sleeve;

[0014] The upper part of the upper pull rod is provided with a pull rod chip removal channel which runs from the top end to the outer wall;

[0015] The fixture body is provided with a body chip removal channel corresponding to the pull rod chip removal channel, and the body chip removal channel passes through the inner wall and the outer wall of the fixture body, and is used to discharge the iron chips located inside the upper pull rod;

[0016] At least one chip removal groove is provided on the top of the support seat, and the chip removal groove communicates with the inner wall and the outer wall of the support seat, and is used for discharging iron chips between the support seat and the hollow cylinder.

[0017] Furthermore, three body chip removal channels are evenly arranged on the fixture body along the circumferential direction, so as to reduce the difficulty of assembling the body chip removal channel and the pull rod chip removal channel correspondingly;

[0018] The chip removal grooves of the support seat are arranged radially; there are six chip removal grooves in total, which are evenly distributed along the circumference to improve the chip removal effect on the support seat.

[0019] Furthermore, an inner conical surface is provided at the top of the pull rod chip removal channel of the upper pull rod to facilitate the falling of iron chips;

[0020] The cross section of the main body chip removal channel of the fixture body is trapezoidal, and the size of the main body chip removal channel gradually increases from the inside to the outside along the radial direction;

[0021] The cross section of the chip groove of the support seat is rectangular for easy processing.

[0022] Furthermore, the outer peripheral surface of the convex ring of the upper pull rod is an outer conical surface with the small end facing downward;

[0023] The upper part of the hollow cylinder of the clamp body is provided with a cylindrical section and an outer cone with a small end facing upward from top to bottom, the diameter of the small end of the outer cone is the same as the diameter of the cylindrical section, and the diameter of the large end is the same as the diameter of the hollow cylinder;

[0024] The expansion sleeve is a double-cone structure, with the inner cone surface of the upper end matching the outer cone surface of the convex ring, the inner wall of the middle part matching the outer wall of the cylindrical section, and the inner cone surface of the lower end matching the outer cone surface of the hollow cylinder, so as to increase the tightening range.

[0025] Furthermore, it also includes a positioning sleeve sleeved on the upper pull rod;

[0026] The positioning sleeve is located below the fixture body and is fixedly connected to the fixture body for positioning the gear shaping fixture.

[0027] Furthermore, the top end of the positioning sleeve is provided with a chamfer that matches the chip removal channel of the body.

[0028] Furthermore, a fixing screw is provided on the clamp body, and a corresponding fixing groove is provided on the outer wall of the upper pull rod, which is used to fix the relative position between the upper pull rod and the clamp body to prevent the upper pull rod from rotating.

[0029] Furthermore, the bottom end of the upper pull rod is provided with an external thread, and the top end of the lower pull rod is provided with an internal thread matching therewith, and the upper pull rod is threadably connected to the lower pull rod.

[0030] Furthermore, the upper pull rod and the lower pull rod are fixed by a first screw;

[0031] The positioning sleeve is fixedly connected to the fixture body by a second screw;

[0032] The support seat is fixedly connected to the clamp body through a third screw.

[0033] Furthermore, a positioning ring with a threaded hole is provided on the outer wall of the bottom end of the fixture body, and the positioning ring is used to be fixedly connected to the workbench of the machine tool.

[0034] Compared with the prior art, the utility model has the following beneficial effects:

[0035] 1. The utility model discloses a chip removal type gear shaping fixture. On the basis of the structure of the existing gear shaping fixture, a chip removal channel is added to the upper pull rod, the fixture body and the support seat, so that the iron chips inside the gear shaping fixture and between the support seat and the fixture body can be discharged, which effectively prevents the iron chips from being mixed in the gear shaping fixture during gear shaping and affecting the processing accuracy of the workpiece, thereby ensuring the yield rate of the workpiece gear shaping.

[0036] 2. The utility model discloses a chip removal type gear shaping fixture, which adopts the design of bonding expansion sleeve. A non-metallic material layer is provided on the inner surface of the expansion sleeve to achieve the bonding of the expansion sleeve, thereby increasing the tightening range of the expansion sleeve. When changing production of workpieces with different hole systems, only the expansion sleeve and the support seat need to be replaced, thereby improving the production change efficiency of gear shaping processing and effectively reducing inventory costs.

[0037] 3. The utility model is a chip removal type gear shaping fixture. The bonding expansion sleeve adopts a double-cone design. Conical surfaces are arranged at the upper and lower ends to cooperate with other parts, thereby ensuring the tightening effect of the expansion sleeve and increasing the tightening range of the expansion sleeve. The gear shaping fixture can adapt to more types of workpieces and improve production flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of an embodiment of a chip removal type gear shaping fixture of the utility model;

[0039] Figure 2 The utility model is a three-dimensional structural schematic diagram of a chip removal type gear shaping fixture embodiment.

[0040] The reference numerals in the accompanying drawings are as follows: 1-expansion sleeve; 2-support seat; 3-upper pull rod; 4-fastening screw; 5-clamp body; 6-positioning sleeve; 7-first screw; 8-lower pull rod; 9-second screw; 10-third screw. DETAILED DESCRIPTION

[0041] The specific technical solutions in the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0042] See also Figure 1 and Figure 2 A chip removal type gear shaping fixture comprises a bonding expansion sleeve 1, a support seat 2, an upper pull rod 3, a set screw 4, a fixture body 5, a positioning sleeve 6, a first screw 7, a lower pull rod 8, a second screw 9, and a third screw 10;

[0043] One end of the lower pull rod 8 is provided with a mounting column, and the gear shaping fixture is connected to the hydraulic cylinder of the machine tool through the mounting column; Definition: the end of the lower pull rod 8 connected to the machine tool is the bottom end, the bottom end is located at the bottom, and the other end is the top end;

[0044] The bottom end of the upper pull rod 3 is provided with an external thread, and the top end of the lower pull rod 8 is provided with an internal thread matching therewith. The upper pull rod 3 is threadedly connected with the lower pull rod 8 and is fastened and reinforced by a first screw 7;

[0045] The clamp body 5 and the positioning sleeve 6 are sequentially mounted on the upper pull rod 3 from top to bottom;

[0046] The positioning sleeve 6 is placed in the positioning hole of the machine tool workbench;

[0047] The positioning sleeve 6 is fixedly connected to the clamp body 5 by the second screw 9, and the clamp body 5 is fixed to the upper pull rod 3 by the set screw 4 to prevent it from rotating;

[0048] The top of the positioning sleeve 6 is provided with a chamfer that matches the chip removal channel of the body;

[0049] A convex ring is provided on the outer side of the top end of the upper pull rod 3, and an outer conical surface is provided on the outer periphery of the convex ring;

[0050] A hollow cylinder is provided at the top of the clamp body 5. The hollow cylinder extends axially to a position close to the convex ring and a gap is left between the convex ring. An outer conical surface is provided at the top of the hollow cylinder.

[0051] The support seat 2 is sleeved on the hollow cylinder on the clamp body 5 and is fixedly connected to the clamp body 5 by a third screw 10;

[0052] A positioning ring with threaded holes is provided on the outer wall of the bottom end of the clamp body 5, and the clamp body 5 is mounted on the working table of the machine tool by screws through the positioning ring.

[0053] The bonding expansion sleeve 1 is mounted on the convex ring and the hollow cylinder;

[0054] The bonding expansion sleeve 1 is a double cone structure, the inner surface of which is covered with non-metallic material, the inner cone surface of the upper end matches with the outer cone surface of the convex ring, and the inner cone surface of the lower end matches with the outer cone surface of the hollow cylinder;

[0055] The upper part of the upper pull rod 3 is provided with a pull rod chip removal channel which runs from the top end to the outer wall;

[0056] Three body chip removal channels are evenly arranged on the fixture body 5 along the circumferential direction. During assembly, ensure that one of the body chip removal channels corresponds to the pull rod chip removal channel.

[0057] The cross section of the main body chip removal channel of the fixture body 5 is trapezoidal, and the size of the main body chip removal channel gradually increases from the inside to the outside along the radial direction;

[0058] The main body chip removal channel passes through the inner wall and the outer wall of the fixture body 5;

[0059] Six chip removal grooves are radially opened on the top of the support seat 2 and evenly distributed along the circumference. The chip removal grooves connect the inner wall and the outer wall of the support seat 2 and are used to discharge iron chips between the support seat 2 and the hollow cylinder; the cross-section of the chip removal groove is rectangular.

[0060] The working process of the embodiment of the utility model is as follows:

[0061] The hydraulic cylinder of the machine tool pulls the lower tie rod 8 downward, and the lower tie rod 8 drives the upper tie rod 3 to move downward at the same time, thereby driving the upper inner conical surface of the bonding expansion sleeve 1 to tighten with the outer conical surface of the upper tie rod 3; at the same time, during the downward movement of the upper tie rod 3, the lower inner conical surface of the bonding expansion sleeve 1 and the outer conical surface of the fixture body 5 are tightened. At this time, the bonding expansion sleeve is tightened.

[0062] During the tightening process, the gap between the adhesive expansion sleeve 1 and the positioning hole of the workpiece is gradually eliminated, and the workpiece is tightened to achieve the positioning of the inner hole of the workpiece.

[0063] The above description is only an embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any equivalent structural transformation made using the contents of the present utility model specification and drawings, or directly or indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A chip removal type gear shaping fixture, comprising an expansion sleeve (1), a support seat (2), an upper pull rod (3), a fixture body (5) and a lower pull rod (8); One end of the lower pull rod (8) is provided with a mounting column, and the mounting column is used to connect with the hydraulic cylinder of the machine tool; definition: the end of the lower pull rod (8) connected with the hydraulic cylinder of the machine tool is the bottom end, the bottom end is located at the bottom, and the other end is the top end; the bottom end of the upper pull rod (3) is fixedly connected with the top end of the lower pull rod (8); The clamp body (5) is sleeved on the upper pull rod (3); a convex ring is provided on the outer side of the top end of the upper pull rod (3); a hollow cylinder is provided on the top end of the clamp body (5); the hollow cylinder extends axially to a position close to the convex ring and a gap is left between the convex ring and the convex ring; the expansion sleeve (1) is sleeved on the outer side of the hollow cylinder and abuts against the convex ring; the support seat (2) is sleeved on the hollow cylinder of the clamp body (5) and is fixedly connected to the clamp body (5); Features: The expansion sleeve (1) is a bonding expansion sleeve, the inner surface of which is a non-metallic material coating layer, which is used to achieve bonding cooperation with the convex ring and the outer wall of the top end of the hollow cylinder; The upper part of the upper pull rod (3) is provided with a pull rod chip removal channel which runs from the top end to the outer wall; The clamp body (5) is provided with a body chip removal channel corresponding to the pull rod chip removal channel, the body chip removal channel passes through the inner wall and the outer wall of the clamp body (5), and is used to discharge iron chips located inside the upper pull rod (3); At least one chip removal groove is provided on the top of the support seat (2), the chip removal groove being connected to the inner wall and the outer wall of the support seat (2) and being used for discharging iron chips between the support seat (2) and the hollow cylinder.

2. A chip removal type gear shaping fixture according to claim 1, characterized in that: The clamp body (5) is evenly provided with three body chip removal channels along the circumferential direction, so as to reduce the difficulty of assembling the body chip removal channels and the pull rod chip removal channels correspondingly; The chip removal grooves of the support seat (2) are arranged radially; there are six chip removal grooves in total, which are evenly distributed along the circumferential direction.

3. A chip removal type gear shaping fixture according to claim 2, characterized in that: The top end of the pull rod chip removal channel of the upper pull rod (3) is provided with an inner conical surface; The cross section of the main body chip removal channel of the clamp body (5) is trapezoidal, and the size of the main body chip removal channel gradually increases from the inside to the outside along the radial direction; The cross section of the chip removal groove of the support seat (2) is rectangular.

4. A chip removal gear shaping fixture according to any one of claims 1 to 3, characterized in that: The outer peripheral surface of the convex ring of the upper pull rod (3) is an outer conical surface with the small end facing downward; The upper part of the hollow cylinder of the clamp body (5) is provided with a cylindrical section and an outer cone with a small end facing upward from top to bottom, the diameter of the small end of the outer cone is the same as the diameter of the cylindrical section, and the diameter of the large end is the same as the diameter of the hollow cylinder; The expansion sleeve (1) is a double-cone structure, the inner conical surface of the upper end cooperates with the outer conical surface of the convex ring, the inner wall of the middle part cooperates with the outer wall of the cylindrical section, and the inner conical surface of the lower end cooperates with the outer conical surface of the hollow cylinder.

5. A chip removal type gear shaping fixture according to claim 4, characterized in that: It also includes a positioning sleeve (6) sleeved on the upper pull rod (3); The positioning sleeve (6) is located below the clamp body (5) and is fixedly connected to the clamp body (5) and is used for positioning the gear shaping clamp.

6. A chip removal type gear shaping fixture according to claim 5, characterized in that: The top end of the positioning sleeve (6) is provided with a chamfer that matches the chip removal channel of the body.

7. A chip removal type gear shaping fixture according to claim 6, characterized in that: The clamp body (5) is provided with a fixing screw (4), and the outer wall of the upper pull rod (3) is provided with a corresponding fixing groove for preventing the upper pull rod (3) from rotating.

8. The chip removal type gear shaping fixture according to claim 7, characterized in that: The bottom end of the upper pull rod (3) is provided with an external thread, and the top end of the lower pull rod (8) is provided with an internal thread matching therewith, and the upper pull rod (3) and the lower pull rod (8) are threadedly connected.

9. A chip removal type gear shaping fixture according to claim 8, characterized in that: The upper pull rod (3) and the lower pull rod (8) are fixed by a first screw (7); The positioning sleeve (6) is fixedly connected to the fixture body (5) via a second screw (9); The support seat (2) is fixedly connected to the clamp body (5) via a third screw (10).

10. The chip removal type gear shaping fixture according to claim 9, characterized in that: The outer wall of the bottom end of the clamp body (5) is provided with a positioning ring with a threaded hole, and the positioning ring is used for fixed connection with the working table of the machine tool.

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