Gear shaping clamp and gear shaping machine

Abstract

The utility model provides a gear shaping clamp and a gear shaping machine, and the gear shaping clamp comprises a clamp body which is provided with a first through hole and a second through hole; the expansion sleeve assembly comprises an expansion sleeve, a positioning tip and a positioning pin, the expansion sleeve is arranged in the first through hole in a penetrating mode, the end face of the bottom end of the expansion sleeve exceeds the end face of the bottom end of the clamp body, the tip end of the positioning tip faces an opening in the top end of the expansion sleeve, a positioning groove matched with the positioning pin is formed in the peripheral face of the expansion sleeve, and the second through hole is used for installing the positioning pin; one end of the connecting rod is in threaded connection with the bottom end of the expansion sleeve, and the other end of the connecting rod is used for being in threaded connection with a pull rod in the gear shaping machine. According to the utility model, high-precision positioning can be carried out on the workpiece, the processing quality of the workpiece is improved, the long-axis workpiece can be sunk below the surface of the workbench when the positioning device is applied to processing of the long-axis workpiece, the problem that the long-axis workpiece cannot be clamped by a short-throat-height gear shaper is effectively solved, and the utilization rate of the short-throat-height gear shaper is obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of gear processing technology, and in particular to a gear shaping fixture and a gear shaping machine. Background Technology

[0002] In the field of mechanical manufacturing, gear shapers are key equipment for gear processing. They achieve precision machining of gear teeth through cutting processes to meet the demand for high-precision gears in various mechanical products.

[0003] Currently, traditional gear shaping fixtures have the following drawbacks in the gear shaping process of long shaft workpieces: Firstly, traditional gear shaping fixtures mostly use relatively simple radial or axial positioning methods, making it difficult to accurately position the outer diameter of long shaft workpieces. This causes the long shaft workpieces to easily shift and wobble during processing, leading to machining errors and seriously affecting the machining quality. Secondly, traditional gear shaping fixtures have low versatility. When applied to short-throat height gear shaping machines, they cannot sink long shaft workpieces below the worktable surface, resulting in the workpiece height above the worktable being too high, exceeding the allowable range of the throat height of the short-throat height gear shaping machine. This prevents the short-throat height gear shaping machine from clamping and processing long shaft workpieces, greatly limiting the range of objects that can be processed by the short-throat height gear shaping machine, resulting in wasted equipment capacity, increased processing costs, and higher equipment idle rates for enterprises. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a gear shaping fixture and a gear shaping machine, which aims to solve the technical problems of traditional gear shaping fixtures in the gear shaping process of long shaft workpieces. Not only is it difficult to accurately position the middle outer circle of long shaft workpieces, which seriously affects the processing quality of the workpieces, but it also has low versatility. When it is applied to a short throat height gear shaping machine, it cannot clamp and process long shaft workpieces, which limits the processing range of the short throat height gear shaping machine and causes waste of equipment capacity.

[0005] One aspect of this utility model is to provide a tooth-shaping clamp, comprising:

[0006] The clamp body has a first through hole and a second through hole. The first through hole is arranged along the axial direction of the clamp body, and the second through hole is arranged along the radial direction of the clamp body and communicates with the middle part of the first through hole along the axial direction.

[0007] An expansion sleeve assembly includes an expansion sleeve, a positioning tip disposed inside the bottom end of the expansion sleeve and detachably connected to the expansion sleeve, and a positioning pin for limiting the rotation of the expansion sleeve. The expansion sleeve is inserted through a first through hole, the bottom end face of the expansion sleeve extends beyond the bottom end face of the clamp body, the tip of the positioning tip is opened towards the top end of the expansion sleeve, the outer peripheral surface of the expansion sleeve is provided with a positioning groove adapted to the positioning pin, and the second through hole is used to install the positioning pin.

[0008] A connecting rod, one end of which is threaded to the bottom end of the expansion sleeve, and the other end of which is threaded to the pull rod inside the gear hobbing machine.

[0009] Furthermore, the fixture body is provided with third through holes on both radial sides, and the first connecting bolt passes through the third through holes to connect with the preset threaded holes on the worktable of the gear hobbing machine, so as to fix the fixture body on the gear hobbing machine.

[0010] Furthermore, the expansion sleeve is used to fix the workpiece. The expansion sleeve includes a clamping part, a connecting part integrally connected to the clamping part, and a mounting part integrally connected to the connecting part. The circumferential thickness of the clamping part gradually decreases towards the mounting part. The inner wall of the connecting part is in clearance fit with the outer peripheral surface of the workpiece. The outer peripheral surface of the connecting part is provided with the positioning groove. The mounting part is provided with the positioning center and is threaded to the bottom end of the positioning center by a second connecting bolt.

[0011] Furthermore, a protruding ring is provided on the inner wall of the connecting part near the mounting part, the protruding ring being used to fit against the outer peripheral surface of the workpiece.

[0012] Furthermore, one end of the connecting rod is provided with an internal threaded hole, the outer peripheral surface of the mounting part is provided with an external thread adapted to the internal threaded hole, and the outer wall of the end of the connecting rod with the internal threaded hole is clearance-fitted with the inner wall of the first through hole, and the outer peripheral surface of the other end of the connecting rod is provided with an external thread.

[0013] Furthermore, the gear-shaping fixture also includes a sealing rod, which includes a connecting rod portion and a limiting portion extending radially outward from the circumferential surface of the connecting rod portion. The connecting rod portion is adapted to a through hole in the workpiece. When the workpiece is located inside the expansion sleeve and the sealing rod is located inside the workpiece, the limiting portion abuts against the inner wall of the through hole in the workpiece. The tip of the positioning center is located inside the through hole at the bottom end of the workpiece, and the bottom end face of the connecting rod portion abuts against the tip of the positioning center.

[0014] Furthermore, the tooth-shaping clamp also includes a cover body, which includes a fixing part and a cover plate part integrally connected to the fixing part. The fixing part is fixed to the top of the clamp body by a third connecting bolt, and a gap is provided between the bottom surface of the cover plate part and the top end face of the expansion sleeve.

[0015] Another aspect of this utility model is to provide a gear shaping machine, including a worktable, a tool holder disposed above the worktable, and a gear shaping cutter movably connected to the tool holder via a slider, and also including the aforementioned gear shaping fixture. The worktable is provided with a mounting through hole for mounting the gear shaping fixture, and a pull rod is slidably provided at the bottom end of the mounting through hole. The pull rod is provided with an internal thread hole adapted to the external thread on the end of the connecting rod, and the fixture body is fixedly connected to the worktable via a first connecting bolt.

[0016] Compared with existing technologies, the advantages of this utility model's gear hobbing fixture and gear hobbing machine are as follows: it can perform high-precision positioning of the outer circle of the workpiece, improving the processing quality of the workpiece. Specifically, the precise positioning and stable clamping of the workpiece to be processed are achieved through the cooperation of the expansion sleeve assembly, connecting rod, and pull rod on the worktable, ensuring that the workpiece will not be displaced during processing. Furthermore, when the gear hobbing fixture of this application is used for processing long shaft workpieces, it can sink the long shaft workpiece under the worktable surface, effectively solving the problem that short throat height gear hobbing machines cannot clamp long shaft workpieces, significantly improving the utilization rate of short throat height gear hobbing machines, and reducing the processing cost and equipment idle rate of enterprises. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of the tooth-shaping clamp of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the gear hobbing machine of this utility model when a workpiece is installed inside;

[0019] Figure 3 This is a schematic diagram of the gear hobbing machine of this utility model in the debugging state;

[0020] Figure 4 This is a schematic diagram of the gear hobbing machine of this utility model in use.

[0021] The above-mentioned drawings include the following reference numerals: 10-clamp body; 101-first through hole; 102-second through hole; 103-third through hole; 21-expansion sleeve; 211-clamping part; 212-connecting part; 213-mounting part; 214-convex ring part; 22-positioning center; 23-positioning pin; 30-connecting rod; 40-cover; 51-workpiece; 52-sealing rod; 521-connecting rod part; 522-limiting part; 61-first connecting bolt; 62-second connecting bolt; 63-third connecting bolt; 71-worktable; 711-mounting through hole; 72-pull rod; 73-tool holder; 74-slider; 75-gear cutter; 81-calibration standard part; 82-dial indicator.

[0022] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Please see Figure 1The diagram shows a gear shaping fixture according to the present invention, comprising a fixture body 10, an expansion sleeve assembly disposed inside the fixture body 10, and a connecting rod 30 detachably connected to the expansion sleeve assembly. The fixture body 10 has a first through hole 101 and a second through hole 102. The first through hole 101 is arranged along the axial direction of the fixture body 10, and the second through hole 102 is arranged along the radial direction of the fixture body 10 and communicates with the middle part of the first through hole 101 along the axial direction. Third through holes 103 are respectively provided on both radial sides of the fixture body 10. A first connecting bolt 61 passes through the third through hole 103 and connects to a pre-set threaded hole on the worktable 71 of the gear shaping machine to fix the fixture body 10 on the gear shaping machine, ensuring that the fixture body 10 will not shift due to vibration or other factors during the operation of the gear shaping machine, thus guaranteeing processing accuracy.

[0027] As an example, the expansion sleeve assembly includes an expansion sleeve 21, a positioning tip 22 disposed inside the bottom end of the expansion sleeve 21 and detachably connected to the expansion sleeve 21, and a positioning pin 23 for limiting the rotation of the expansion sleeve 21. The expansion sleeve 21 is inserted into the first through hole 101, and the bottom end face of the expansion sleeve 21 extends beyond the bottom end face of the clamp body 10. The tip of the positioning tip 22 is set to open towards the top end of the expansion sleeve 21. The outer peripheral surface of the expansion sleeve 21 is provided with a positioning groove adapted to the positioning pin 23. The second through hole 102 is used to install the positioning pin 23. In this embodiment, the second through hole 102 is connected to the positioning pin 23 by a threaded connection.

[0028] Furthermore, the expansion sleeve 21 is used to fix the workpiece 51. The expansion sleeve 21 includes a clamping part 211, a connecting part 212 integrally connected to the clamping part 211, and a mounting part 213 integrally connected to the connecting part 212. The circumferential thickness of the clamping part 211 gradually decreases towards the mounting part 213. This can also be understood as the circumferential thickness of the end of the clamping part 211 away from the connecting part 212 being greater than the circumferential thickness of the end of the clamping part 211 connected to the connecting part 212. The inner wall of the connecting part 212 is clearance-fitted with the outer peripheral surface of the workpiece 51, and a positioning groove is provided on the outer peripheral surface of the connecting part 212. In this embodiment, the positioning groove is a rectangular groove structure, and the width of the positioning groove is adapted to the diameter of the end of the positioning pin 23 to achieve the engagement between the positioning groove and the end of the positioning pin 23, thereby restricting the rotation of the expansion sleeve 21. It should be noted that in this embodiment, the workpiece 51 is a long shaft type workpiece.

[0029] The mounting portion 213 is provided with a positioning tip 22. The top of the positioning tip 22 has an internal threaded hole that matches the second connecting bolt 62. The second connecting bolt 62 is threadedly connected to the bottom of the positioning tip 22. Further, a protruding ring portion 214 is provided on the inner wall of the connecting portion 212 near the mounting portion 213. The protruding ring portion 214 is used to fit against the outer peripheral surface of the workpiece 51 to position the outer circle of the workpiece 51. In some embodiments, the clamping portion 211 or the protruding ring portion 214 on the expansion sleeve 21, etc., used for clamping or positioning, can be made of elastic friction material such as rubber, which can both fit against the surface of the workpiece 51 and avoid scratches, while enhancing the clamping force and further stabilizing the workpiece 51 radially.

[0030] One end of the connecting rod 30 is threaded to the bottom end of the expansion sleeve 21, and the other end of the connecting rod 30 is threaded to the pull rod 72 inside the gear hobbing machine. Further, one end of the connecting rod 30 has an internal threaded hole, and the outer circumferential surface of the mounting part 213 has an external thread adapted to the internal threaded hole. The outer wall of the end of the connecting rod 30 with the internal threaded hole is clearance-fitted with the inner wall of the first through hole 101, and the outer circumferential surface of the other end of the connecting rod 30 has an external thread.

[0031] Furthermore, the first through hole 101 within the fixture body 10 has a stepped hole structure, with a circular cross-section at its large end opening and a rectangular cross-section at its small end opening. The axial center of the large end opening communicates with the second through hole 102, which is radially arranged along the fixture body 10. Correspondingly, the outer contour of the end of the connecting rod 30 with the internal threaded hole is a rectangular structure, which is adapted to the small end opening of the first through hole 101.

[0032] The gear hobbing fixture of this application also includes a sealing rod 52, which includes a connecting rod portion 521 and a limiting portion 522 extending radially outward from the circumferential surface of the connecting rod portion 521. The connecting rod portion 521 is adapted to the through hole in the workpiece 51. When the workpiece 51 is located inside the expansion sleeve 21 and the sealing rod 52 is located inside the workpiece 51, the limiting portion 522 abuts against the inner wall of the through hole in the workpiece 51, the tip of the positioning center 22 is located in the through hole at the bottom end of the workpiece 51, and the bottom end face of the connecting rod portion 521 abuts against the tip of the positioning center 22. The sealing rod 52 not only prevents cutting chips and other impurities from entering the gear hobbing fixture through the through hole inside the workpiece 51 during machining, thus affecting machining accuracy, extending the service life of the gear hobbing fixture, and ensuring machining quality, but also further assists the positioning center 22 in axially positioning the workpiece 51.

[0033] The gear-shaping fixture of this application also includes a cover 40. The function of the cover 40 is to prevent foreign objects such as debris during the processing from falling into the expansion sleeve assembly, affecting the normal operation of the expansion sleeve 21 and the positioning accuracy of the workpiece 51. In this embodiment, the cover 40 includes a fixing part and a cover plate part integrally connected to the fixing part. The fixing part is fixed to the top of the fixture body 10 by a third connecting bolt 63. A gap is provided between the bottom surface of the cover plate part and the top end face of the expansion sleeve 21.

[0034] In actual assembly, the assembly steps of the gear-shaping fixture of this application can be as follows: First, the positioning tip 22 is placed in the mounting portion 213 at the bottom of the expansion sleeve 21, and the second connecting bolt 62 is threaded through the bottom end of the mounting portion 213 and screwed into the internal threaded hole at the bottom end of the positioning tip 22 to achieve a stable connection between the positioning tip 22 and the mounting portion 213 of the expansion sleeve 21. Next, one end of the connecting rod 30 with an internal threaded hole is inserted into the bottom end of the first through hole 101 on the fixture body 10, and the expansion sleeve 21 with the positioning tip 22 fixed inside is inserted into the fixture body 10 from the top end of the first through hole 101. When the bottom end of the expansion sleeve 21 abuts against the connecting rod 30, the expansion sleeve 21 is rotated so that the mounting portion 213 of the expansion sleeve 21 is screwed into the internal threaded hole on the connecting rod 30, thereby achieving a stable connection between the connecting rod 30 and the expansion sleeve 21. It should be noted that, during this process, since the outer contour of the end of the connecting rod 30 with the internal threaded hole is rectangular, the connecting rod 30 can only move up and down within the small end opening of the first through hole 101 during the rotation of the expansion sleeve 21. Thus, the total length of the connecting rod 30 exposed outside the bottom end of the clamp body 10 can be adjusted by controlling the screwing depth of the mounting part 213 of the expansion sleeve 21 in the internal threaded hole of the connecting rod 30. In other words, the height position of the connecting rod 30 can be adjusted.

[0035] When the connecting rod 30 reaches the preset height position, that is, when the expansion sleeve 21 is rotated into place, the positioning pin 23 is screwed into the second through hole 102 on the fixture body 10 until the end of the positioning pin 23 is engaged in the positioning groove on the expansion sleeve 21, restricting the rotation of the expansion sleeve 21, so that the expansion sleeve 21, the connecting rod 30 and the fixture body 10 form a whole. At this time, the cover 40 is fixed to the top of the fixture body 10 using the third connecting bolt 63 to close the top of the first through hole 101. Next, the sealing rod 52 is inserted into the through hole of the workpiece 51, and the bottom end of the connecting rod part 521 of the sealing rod 52 is inserted into the matching bottom opening in the through hole of the workpiece 51. At this time, the limiting part 522 on the sealing rod 52 fits against the inner wall of the through hole of the workpiece 51, playing a sealing role to prevent cutting chips from falling into the fixture body 10 and the gear shaping machine worktable 71. Finally, the workpiece 51 with the sealing rod 52 is inserted into the expansion sleeve 21, and the outer circle of the workpiece 51 is positioned by the protruding ring portion 214 on the expansion sleeve 21, and the bottom opening of the through hole of the workpiece 51 is positioned by the positioning center 22. At this time, as Figure 1 As shown, the protruding ring 214 on the expansion sleeve 21 is in close contact with the outer peripheral surface of the workpiece 51, and the tip of the positioning center 22 inside the bottom end of the expansion sleeve 21 is located inside the bottom opening of the through hole of the workpiece 51 and abuts against the bottom end face of the sealing rod 52.

[0036] Another aspect of this utility model is to provide a gear shaping machine, including a worktable 71, a tool holder 73 disposed above the worktable 71, a gear shaping cutter 75 movably connected to the tool holder 73 via a slider 74, and a gear shaping fixture as described in the above embodiment. The worktable 71 has a mounting through hole 711 for mounting the gear shaping fixture. A pull rod 72 is slidably provided at the bottom end of the mounting through hole 711, and at least two pre-set threaded holes for mounting a first connecting bolt 61 are provided on the surface of the worktable 71 in the radial direction of the mounting through hole 711. The pull rod 72 has an internal threaded hole adapted to the external thread on the end of the connecting rod 30. The gear shaping cutter 75 is fixed to the slider 74 by a threaded connection and moves up and down within the tool holder 73 via the slider 74. The fixture body 10 is fixedly connected to the worktable 71 via the first connecting bolt 61, i.e., as shown in the figure. Figure 2 As shown. It should be understood that the tool holder 73, gear cutter 75, and other structures in this embodiment are conventional equipment structures well known to those skilled in the art, and will not be described in detail here.

[0037] In practical use, the working principle of using the gear-shaping fixture of this utility model for gear-shaping of long shaft workpieces can be summarized as follows:

[0038] like Figure 3As shown, the gear shaping machine is first debugged. Specifically, the tool holder 73 is retracted, and a gear shaping cutter 75 is installed on the slider 74 of the tool holder 73. The lower end of the assembled gear shaping fixture is inserted into the mounting through hole 711 on the worktable 71, and the connecting rod 30 on the gear shaping fixture is aligned with the internal thread hole on the pull rod 72. The fixture is rotated so that the connecting rod 30 is screwed into the internal thread hole of the pull rod 72. During this process, the entire gear shaping fixture will move axially accordingly. When the gear shaping fixture moves down to the preset height, the first connecting bolt 61 passes through the third through hole 103 on the gear shaping fixture and is threadedly connected to the preset thread hole on the worktable 71 to securely fix the entire gear shaping fixture on the worktable 71. At this point, the calibration standard part 81 is inserted, the gear shaping machine is started, the pull rod 72 pulls the connecting rod 30 downward, the connecting rod 30 drives the expansion sleeve assembly to move downward, and the clamping part 211 of the expansion sleeve 21 moves downward simultaneously. The outer peripheral surface of the clamping part 211 is squeezed by the inner wall of the first through hole 101 of the fixture body 10, and clamps the outer peripheral surface of the calibration standard part 81, thereby achieving stable positioning of the calibration standard part 81. At this point, the dial indicator base is installed on the gear shaping machine, so that the needle of the dial indicator 82 on the dial indicator base presses against the outer circle of the calibration standard part 81. The machine tool is turned on to rotate the worktable 71 to detect the runout of the calibration standard part 81, in order to determine whether the installation of the gear shaping fixture is qualified. If it is not qualified, the fixture body 10 is radially adjusted and the test is repeated until it is qualified. If it is qualified, the first connecting bolt 61 is tightened to fix the position of the gear shaping fixture on the worktable 71.

[0039] Next, the release button on the machine tool is pressed, causing the pull rod 72 to move upward, which in turn moves the expansion sleeve 21 upward to release the calibration standard part 81. The calibration standard part 81 is then removed and inserted into the workpiece 51 to be processed. The sealing rod 52 is then inserted into the through hole of the workpiece 51 to ensure that the lower end of the through hole is sealed, preventing cutting debris from entering the gear hobbing fixture and the worktable 71 during the cutting process. Subsequently, the clamping button on the machine tool is pressed, causing the pull rod 72 to move downward, which in turn moves the expansion sleeve 21 to clamp the workpiece 51 to ensure the stability of the workpiece 51 during the gear hobbing process. Figure 2 As shown.

[0040] Finally, as Figure 4As shown, the gear shaping machine enters the processing state. The tool holder 73 moves forward, causing the gear shaping cutter 75 to move directly above the workpiece 51 to be processed, and the gear shaping cutter 75 is aligned with the inner hole at the top of the workpiece 51. The gear shaping cutter 75 moves up and down to cut the inner hole. Throughout the process, the worktable 71 will rotate the entire gear shaping fixture and the workpiece 51 according to a preset speed ratio to process the full circle of internal teeth in the inner hole. After the gear shaping of the workpiece 51 is completed, the gear shaping cutter 75 exits the inner hole, the tool holder 73 retracts, the machine tool's release button is pressed to replace the new workpiece 51 and insert the sealing rod 52, and the clamping button of the equipment is pressed to clamp the workpiece 51, starting the next processing cycle and completing the processing of the next workpiece 51.

[0041] In summary, the beneficial effects of the gear hobbing fixture and gear hobbing machine of this utility model are as follows: it can perform high-precision positioning of the outer circle of the workpiece, improving the processing quality of the workpiece. Specifically, the precise positioning and stable clamping of the workpiece to be processed are achieved through the cooperation of the expansion sleeve assembly, the connecting rod, and the pull rod on the worktable, ensuring that the workpiece will not be displaced during processing. Furthermore, when the gear hobbing fixture of this application is used for processing long shaft workpieces, it can sink the long shaft workpiece under the worktable surface, effectively solving the problem that short throat height gear hobbing machines cannot clamp long shaft workpieces, significantly improving the utilization rate of short throat height gear hobbing machines, and reducing the processing cost and equipment idle rate of enterprises.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model application should be determined by the appended claims.

Claims

1. A gear-shaping clamp, characterized in that, include: The clamp body has a first through hole and a second through hole. The first through hole is arranged along the axial direction of the clamp body, and the second through hole is arranged along the radial direction of the clamp body and communicates with the middle part of the first through hole along the axial direction. An expansion sleeve assembly includes an expansion sleeve, a positioning tip disposed inside the bottom end of the expansion sleeve and detachably connected to the expansion sleeve, and a positioning pin for limiting the rotation of the expansion sleeve. The expansion sleeve is inserted through a first through hole, the bottom end face of the expansion sleeve extends beyond the bottom end face of the clamp body, the tip of the positioning tip is opened towards the top end of the expansion sleeve, the outer peripheral surface of the expansion sleeve is provided with a positioning groove adapted to the positioning pin, and the second through hole is used to install the positioning pin. A connecting rod, one end of which is threaded to the bottom end of the expansion sleeve, and the other end of which is threaded to the pull rod inside the gear hobbing machine.

2. The gear-shaping clamp according to claim 1, characterized in that, The fixture body is provided with third through holes on both radial sides. The first connecting bolt passes through the third through holes and connects to the preset threaded holes on the worktable of the gear hobbing machine to fix the fixture body on the gear hobbing machine.

3. The gear-shaping clamp according to claim 1, characterized in that, The expansion sleeve is used to fix the workpiece. The expansion sleeve includes a clamping part, a connecting part integrally connected to the clamping part, and a mounting part integrally connected to the connecting part. The circumferential thickness of the clamping part gradually decreases towards the mounting part. The inner wall of the connecting part is in clearance fit with the outer peripheral surface of the workpiece. The outer peripheral surface of the connecting part is provided with the positioning groove. The mounting part is provided with the positioning center and is threaded to the bottom end of the positioning center by a second connecting bolt.

4. The gear-shaping clamp according to claim 3, characterized in that, The inner wall of the connecting part near the mounting part is also provided with a protruding ring, which fits against the outer peripheral surface of the workpiece.

5. The gear-shaping clamp according to claim 3, characterized in that, One end of the connecting rod is provided with an internal threaded hole, and the outer peripheral surface of the mounting part is provided with an external thread that is adapted to the internal threaded hole. The outer wall of the end of the connecting rod with the internal threaded hole is clearance-fitted with the inner wall of the first through hole, and the outer peripheral surface of the other end of the connecting rod is provided with an external thread.

6. The gear-shaping clamp according to claim 1, characterized in that, The gear-shaping fixture further includes a sealing rod, which includes a connecting rod portion and a limiting portion extending radially outward from the circumferential surface of the connecting rod portion. The connecting rod portion is adapted to a through hole in the workpiece. When the workpiece is located inside the expansion sleeve and the sealing rod is located inside the workpiece, the limiting portion abuts against the inner wall of the through hole in the workpiece. The tip of the positioning center is located inside the through hole at the bottom end of the workpiece, and the bottom end face of the connecting rod portion abuts against the tip of the positioning center.

7. The gear-shaping clamp according to claim 1, characterized in that, The tooth-shaping clamp also includes a cover body, which includes a fixing part and a cover plate part integrally connected to the fixing part. The fixing part is fixed to the top of the clamp body by a third connecting bolt, and a gap is provided between the bottom surface of the cover plate part and the top end face of the expansion sleeve.

8. A gear shaping machine, comprising a worktable, a tool holder disposed above the worktable, and a gear shaping cutter movably connected to the tool holder via a slider, characterized in that, It also includes the gear-shaping fixture according to any one of claims 1 to 7, wherein the worktable is provided with a mounting through hole for mounting the gear-shaping fixture, a pull rod is slidably provided at the bottom end of the mounting through hole, the pull rod is provided with an internal thread hole adapted to the external thread on the end of the connecting rod, and the fixture body is fixedly connected to the worktable by the first connecting bolt.

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