Centering clamping device for gear machining and machine tool

Abstract

The utility model provides a centering clamping device for gear machining and a machine tool, and belongs to the field of machining clamping devices. The centering and clamping device for gear machining comprises a base, a transmission body and at least three positioning sliding blocks, sliding ways for guiding the positioning sliding blocks respectively are arranged on the base, one end of each positioning sliding block extends out of a clamping end and forms a clamping head used for tightly supporting the inner wall of a positioning hole in a workpiece in the radial direction, and the transmission body comprises a guiding part and a matching part. A transmission structure used for driving the positioning sliding blocks to move along the corresponding sliding ways when the transmission body moves in the axial direction is arranged between the matching part and the positioning sliding blocks. The machine tool comprises a machine table and a centering clamping device which is installed on the machine table and used for gear machining. According to the utility model, the inclined moving slide block is used for tightly supporting the positioning hole of the workpiece so as to realize centering and clamping of the workpiece, and the centering and clamping device can be suitable for positioning holes with various different sizes, and is simple in structure and lower in manufacturing cost.

Description

Technical Field

[0001] This utility model belongs to the field of machining clamping devices, and in particular relates to a centering clamping device and machine tool for gear machining. Background Technology

[0002] Some workpieces require positioning based on their inner hole during machining, such as gears. For such workpieces, centering shafts and expansion sleeves are commonly used for positioning.

[0003] To ensure positioning accuracy, the gap between the centering shaft and the positioning hole on the workpiece needs to be small when using a centering shaft for positioning. However, this makes the installation of the workpiece more difficult and reduces the operating efficiency. Moreover, the centering shaft can only position positioning holes of one size, which is difficult to meet the positioning requirements of different workpieces.

[0004] Using expansion sleeves for positioning facilitates workpiece installation, and the expansion of the sleeve can eliminate positioning errors caused by manufacturing tolerances in the positioning holes, increasing positioning accuracy. However, large-diameter expansion sleeves are difficult to machine and require sophisticated processing techniques, resulting in relatively high manufacturing costs. Furthermore, since expansion sleeves clamp workpieces through their own deformation, the limited expansion range restricts their applicability; a single expansion sleeve cannot be used for positioning holes exceeding its expansion capacity, thus limiting its applicability. Utility Model Content

[0005] One of the objectives of this utility model is to provide a centering clamping device for gear processing, so as to solve the technical problem that the centering shaft and expansion sleeve positioning have a limited applicable range for the size of the workpiece positioning hole in the prior art.

[0006] Another objective of this invention is to provide a machine tool to solve the aforementioned technical problems.

[0007] To achieve the above objectives, the technical solution of the centering and clamping device for gear machining provided by this utility model is as follows:

[0008] A centering and clamping device for gear machining includes a base, a transmission body, and at least three positioning sliders. One axial end of the base is a clamping end for clamping the workpiece. The base is provided with slides that guide each positioning slider. The slides are inclined and their center extensions converge at a point on the central axis of the base. One end of each positioning slider extends out of the clamping end and is a chuck for radially clamping the inner wall of a positioning hole on the workpiece. The transmission body includes a guide part and a mating part. The base is provided with a guide hole for axially guiding the guide part. A transmission structure is provided between the mating part and the positioning sliders for driving each positioning slider to move along the corresponding slide when the transmission body moves axially. The transmission body is connected to a drive rod for driving the transmission body to move axially.

[0009] As a further improvement, the chuck of the positioning slider is close to the central axis of the base, the end of the positioning slider away from the chuck is away from the central axis of the base, and the end face of the clamping end of the base is perpendicular to the central axis of the base and this end face constitutes a positioning surface for axial positioning of the workpiece.

[0010] As a further improvement, the mating part protrudes radially from the guide part, and a compressed elastic element is provided between the end face of the mating part near the clamping end and the base in the axial direction. The elastic element is used to cooperate with the drive rod to move the mating part away from the clamping end.

[0011] As a further improvement, the part of the positioning slider adjacent to the chuck head is a chuck neck, and an anti-interference groove is provided on the side of the chuck neck away from the central axis of the base.

[0012] As a further improvement, the base includes an outer sleeve and an inner sleeve mounted inside the outer sleeve in an anti-rotation manner. The outer sleeve has an inner conical surface, and the inner sleeve has an outer conical surface that mates with the inner conical surface. Grooves for forming slides are provided on the inner conical surface of the outer sleeve and / or the outer conical surface of the inner sleeve.

[0013] As a further improvement, the inner sleeve has a central hole that extends axially through the inner sleeve, the central hole constituting the guide hole.

[0014] As a further improvement, the base also includes an end plate fixedly installed at one axial end of the outer sleeve. The end plate is in stop-fit ​​with the end face of the large end of the inner sleeve. The end plate is provided with a clearance hole or clearance groove for avoiding the positioning slider.

[0015] As a further improvement, one of the mating parts and the positioning slider is provided with a groove, and the other is provided with a sliding protrusion for sliding engagement with the groove. The sliding protrusion slides relative to the groove in a direction perpendicular to the central axis of the base. The sliding protrusion and the groove constitute a transmission structure.

[0016] As a further improvement, the mating part has a disc structure, and the edge of the mating part forms the sliding protrusion.

[0017] The beneficial effects are as follows: The centering and clamping device for gear machining provided by this utility model is a pioneering invention. This centering and clamping device for gear machining is equipped with at least three positioning sliders that can slide tiltably in the base. These positioning sliders move synchronously under the drive of the transmission body. When each positioning slider expands outward, it can be clamped against the inner wall of the positioning hole of the workpiece, thereby achieving clamping and centering of the workpiece. Because each positioning slider is independent of the others, it has a larger range of motion compared to existing technologies, thus adapting to a wider range of positioning holes and enhancing the versatility of this centering and clamping device for gear machining.

[0018] To achieve the above objectives, the technical solution for the machine tool provided by this utility model is as follows:

[0019] A machine tool includes a machine base with a centering and clamping device. The centering and clamping device includes a base, a transmission body, and at least three positioning sliders. One axial end of the base is a clamping end for clamping a workpiece. The base has slides that guide each positioning slider. Each slide is inclined and its center extension lines converge at a point on the central axis of the base. One end of each positioning slider extends out of the clamping end and is a chuck for radially clamping the inner wall of a positioning hole on the workpiece. The transmission body includes a guide part and a mating part. The base has a guide hole for axially guiding the guide part. A transmission structure is provided between the mating part and the positioning sliders for driving each positioning slider to move along the corresponding slide when the transmission body moves axially. The transmission body is connected to a drive rod for driving the transmission body to move axially.

[0020] As a further improvement, the chuck of the positioning slider is close to the central axis of the base, the end of the positioning slider away from the chuck is away from the central axis of the base, and the end face of the clamping end of the base is perpendicular to the central axis of the base and this end face constitutes a positioning surface for axial positioning of the workpiece.

[0021] As a further improvement, the mating part protrudes radially from the guide part, and a compressed elastic element is provided between the end face of the mating part near the clamping end and the base in the axial direction. The elastic element is used to cooperate with the drive rod to move the mating part away from the clamping end.

[0022] As a further improvement, the part of the positioning slider adjacent to the chuck head is a chuck neck, and an anti-interference groove is provided on the side of the chuck neck away from the central axis of the base.

[0023] As a further improvement, the base includes an outer sleeve and an inner sleeve mounted inside the outer sleeve in an anti-rotation manner. The outer sleeve has an inner conical surface, and the inner sleeve has an outer conical surface that mates with the inner conical surface. Grooves for forming slides are provided on the inner conical surface of the outer sleeve and / or the outer conical surface of the inner sleeve.

[0024] As a further improvement, the inner sleeve has a central hole that extends axially through the inner sleeve, the central hole constituting the guide hole.

[0025] As a further improvement, the base also includes an end plate fixedly installed at one axial end of the outer sleeve. The end plate is in stop-fit ​​with the end face of the large end of the inner sleeve. The end plate is provided with a clearance hole or clearance groove for avoiding the positioning slider.

[0026] As a further improvement, one of the mating parts and the positioning slider is provided with a groove, and the other is provided with a sliding protrusion for sliding engagement with the groove. The sliding protrusion slides relative to the groove in a direction perpendicular to the central axis of the base. The sliding protrusion and the groove constitute a transmission structure.

[0027] As a further improvement, the mating part has a disc structure, and the edge of the mating part forms the sliding protrusion.

[0028] The beneficial effects are as follows: The machine tool provided by this utility model is an improvement on the prior art. The centering and clamping device of this machine tool is equipped with at least three positioning sliders that can slide tiltably in the base. These positioning sliders move synchronously under the drive of the transmission body. When each positioning slider expands outward, it can be clamped against the inner wall of the positioning hole of the workpiece, thereby achieving clamping and centering of the workpiece. Since each positioning slider is independent of the others, it has a larger range of motion compared to the prior art, thus adapting to a wider range of positioning holes and enhancing the versatility of the machine tool. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the centering and clamping device for gear processing in this utility model;

[0030] Figure 2 This is a schematic diagram of Embodiment 2 of the centering and clamping device for gear processing in this utility model;

[0031] Figure 3 This is a schematic diagram of Embodiment 3 of the centering and clamping device for gear processing in this utility model;

[0032] Figure 4 This is a schematic diagram of embodiment 5 of the centering and clamping device for gear processing in this utility model;

[0033] Figure 5 This is a schematic diagram of embodiment 7 of the centering and clamping device for gear processing in this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Outer sleeve; 2. Inner sleeve; 3. End plate; 4. Anti-rotation pin; 5. Slide rail; 6. Positioning surface; 7. Positioning slider; 71. Clamp; 72. Neck; 73. Slide groove; 74. Anti-interference groove; 8. Transmission body; 81. Guide part; 82. Mating part; 83. Frustum structure; 84. Sliding protrusion; 9. Drive rod; 10. Helical spring; 11. Mounting hole; 12. Groove; 13. Clearance groove; 14. Pin; 15. Cantilever; 16. Workpiece; 17. Positioning hole. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the embodiments.

[0037] To address the problems in the prior art, the basic concept of this utility model is to enable multiple independent sliders to move radially outward synchronously to clamp and center the workpiece, thereby improving the adaptability to positioning holes of different sizes.

[0038] Specific embodiment 1 of the centering and clamping device for gear machining provided by this utility model:

[0039] A centering clamping device for gear machining, see appendix. Figure 1 It includes a base, a transmission body 8, and a positioning slider 7.

[0040] The base is cylindrical in shape, with one axial end serving as the clamping end for holding the workpiece 16. The end face of the clamping end can also position the workpiece 16 axially, thus forming the positioning surface 6. The base includes an outer sleeve 1, an inner sleeve 2, and an end plate 3.

[0041] The outer sleeve 1 is annular with a conical central hole, and the smaller end of the conical hole in the outer sleeve 1 is the clamping end. The inner wall surface of the central hole of the outer sleeve 1 is an inner conical surface. The inner sleeve 2 is installed inside the outer sleeve 1 in an anti-rotation manner. The inner sleeve 2 has an outer conical surface that mates with the inner conical surface on the outer sleeve 1. The two axial end faces of the inner sleeve 2 are aligned with the two axial end faces of the outer sleeve 1, respectively. The end plate 3 is fixedly installed on the end face of the outer sleeve 1 away from the clamping end by bolts. At the same time, the larger end of the inner sleeve 2 is axially stopped by the end plate 3, thus using the end plate 3 to install the inner sleeve 2 inside the outer sleeve 1. An anti-rotation pin 4 is axially penetrating the end plate 3, and a pin hole for inserting the anti-rotation pin 4 is opened on the larger end face of the inner sleeve 2. Using the end plate 3 to fix the inner sleeve 2 inside the outer sleeve 1 simplifies the structure of the inner sleeve 2 and the outer sleeve 1, facilitates manufacturing, and makes it easier to control the machining accuracy of the inner sleeve 2 and the outer sleeve 1.

[0042] A groove is formed on the outer conical surface of the inner sleeve 2 along its generatrix. The space enclosed by this groove and the inner conical surface of the outer sleeve 1 forms a slide 5 for guiding the positioning slider 7. Three slides 5 are evenly arranged along the circumference of the base, and the center extension lines of the three slides 5 converge at a point on the central axis of the base. The positioning slider 7 is an inclined elongated structure with a rectangular cross-section. The positioning slider 7 is located in the corresponding slide 5 and can move obliquely along the corresponding slide 5. One end of the positioning slider 7 extends out of the clamping end of the base, and this end forms the locking head 71 of the positioning slider 7. During the movement of the positioning slider 7 from the clamping end of the base away from the clamping end, the locking head 71 has not only an upward displacement along the axial direction of the base, but also a radial outward displacement along the base.

[0043] The transmission body 8 includes a guide portion 81 and a mating portion 82, both integrally manufactured by machining. The guide portion 81 is a round shaft structure, and the mating portion 82 is a disc structure. The disc-shaped structure of the mating portion 82 facilitates machining and allows it to rotate freely without affecting its use. If the mating portion 82 were not a disc structure, it would be necessary to prevent rotation between the mating portion 82 and the base. A central hole is provided through the center of the inner sleeve 2, and this central hole guides and engages with the guide portion 81 of the transmission body 8, thus forming the guide hole.

[0044] A transmission structure is provided between the mating part 82 and the positioning slider 7. This transmission structure can drive each positioning slider 7 to tilt along the corresponding slide rail 5 when the transmission body 8 moves axially. The transmission structure includes a groove 73 on one of the mating part 82 and the positioning slider 7 and a sliding protrusion 84 on the other. Specifically, a groove 73 is formed on the inner side of the end of the positioning slider 7 away from the locking head 71. The depth direction of the groove 73 is perpendicular to the central axis of the base. The edge of the mating part 82 can be inserted into the groove 73 and slide relative to the groove 73. The direction of relative sliding is perpendicular to the central axis of the base. The edge of the mating part 82 transitions into the groove 73 to ensure smooth relative sliding with a small gap. Therefore, the edge of the mating part 82 also forms a sliding protrusion 84.

[0045] During the axial movement of the mating part 82, the mating part 82 applies force axially to the side wall of the slide groove 73 through its axial end face, thereby subjecting each positioning slider 7 to an axial force. Since the slide groove 73 on each positioning slider 7 engages with the edge of the mating part 82, each positioning slider 7 can maintain the same height at all times, thereby ensuring that the center determined by the locking head 71 of each positioning slider 7 coincides with the central axis of the base, guaranteeing good centering accuracy.

[0046] A drive rod 9 is fixedly connected to the end of the mating part 82 that is axially away from the guide part 81. The drive rod 9 is used to connect to a mechanical power source, such as a hydraulic cylinder or a pneumatic cylinder, or it can be connected to a human power source, such as a lead screw and nut mechanism with a nut fixed in place. The function of the drive rod 9 is to apply axial force to the mating part 82 to drive the transmission body 8 to move axially. When machining the transmission body 8, a threaded part can be machined at the end of the mating part 82 away from the guide part 81, and a threaded hole can be machined at the end of the drive rod 9 to connect the drive rod 9 and the transmission body 8.

[0047] During use, when using the centering clamping device for gear machining to clamp the workpiece 16, it is necessary to apply axial force to the mating part 82 using the drive rod 9. In order to avoid deformation and other issues caused by uneven force on the mating part 82, which would affect the centering accuracy, a frustum structure 83 can be machined on the side of the mating part 82 away from the guide part 81, and the threaded part is located on the end face of the small end of the frustum structure 83. In this way, the force on the small end of the frustum can be evenly distributed to the surrounding area, thereby making the overall force on the mating part 82 more uniform and avoiding force concentration.

[0048] During the clamping of workpiece 16, a sufficiently large pressing force is maintained between the chuck 71 and the inner wall of the positioning hole 17 of workpiece 16 to ensure good positioning accuracy. This requires the mating part 82 to apply a large force to each positioning slider 7 to minimize the gap between the mating part 82 and the side wall of the groove 73 on each positioning slider 7. However, relying solely on the drive rod 9 to apply force to the mating part 82 will result in a large force on one side of the mating part 82, thus affecting the service life of the mating part 82. Therefore, in this embodiment, a compressed elastic element is provided between the axial end face of the mating part 82 near the clamping end and the base. This elastic element is specifically a helical spring 10. The helical spring 10 generates a thrust during its extension, thereby cooperating with the drive rod 9 to move the mating part 82 away from the clamping end. The position of the helical spring 10 acting on the mating part 82 is different from that of the drive rod 9, which is beneficial to improving the service life of the mating part 82.

[0049] Three helical springs 10 are evenly distributed along the circumference of the base, and mounting holes 11 for mounting the helical springs 10 are provided on the inner sleeve 2 of the base, so as to make the structure more compact and improve the stability of the helical springs 10. The elastic element can also be a rubber elastic column or a wave spring. When the clamping accuracy requirement is low, the elastic element may not be provided.

[0050] To make the structure more compact, a groove 12 is provided on the end face of the large end of the inner sleeve 2. The diameter of the groove 12 is slightly larger than the diameter of the mating part 82, so that the mating part 82 can be embedded in the groove 12. The end plate 3 is provided with an opening of the same size as the groove 12 at the corresponding position. An avoidance groove 13 for avoiding the positioning slider 7 is also provided at the edge of the opening on the end plate 3. In other embodiments, it can also be provided as an avoidance hole as needed.

[0051] In this embodiment, the centering clamping device for gear machining needs to be fixedly installed on the machine tool table with each chuck 71 facing upwards. Before clamping the workpiece 16, the mating part 82 is in a lower position under the push of each helical spring 10, and each chuck 71 is also in an outwardly expanded state. Therefore, it is necessary to first use the drive rod 9 to push the mating part 82 upwards so that each chuck 71 moves closer to each other so that it can be inserted into the positioning hole 17 of the workpiece 16.

[0052] Next, the workpiece 16 is placed on the clamping end of the base, and the positioning holes 17 are fitted over each chuck 71. The positioning surface 6 of the clamping end can support and axially position the workpiece 16. Then, the driving rod 9 is used to pull the mating part 82 downward. Each chuck 71 expands outward and moves downward. When the outer surface of the chuck 71 contacts the hole wall of the positioning hole 17 of the workpiece 16, it needs to continue to expand outward to make the chuck 71 in close contact with the hole wall of the positioning hole 17 to ensure positioning accuracy. During this process, the chuck 71 will also drive the workpiece 16 to press against the positioning surface 6 of the base, eliminating the gap between the workpiece 16 and the positioning surface 6 to ensure the axial positioning accuracy of the workpiece 16.

[0053] After workpiece 16 is machined, the disassembly process is the reverse of the above process, which will not be described in detail here.

[0054] During the above-described process, the axis of workpiece 16 remains vertical, and workpiece 16 is supported by the base. Therefore, the force exerted on workpiece 16 by each clamp 71 is relatively uniform, resulting in a good centering effect. In other embodiments, the axis of workpiece 16 can also be horizontal. In this case, the weight of workpiece 16 will cause differences in the force exerted on each clamp 71. Therefore, additional support is needed for workpiece 16, such as support rollers or similar structures.

[0055] The chuck 71 needs to be in close contact with the wall of the positioning hole 17 of the workpiece 16. Therefore, the side of the chuck 71 away from the central axis of the base can be machined into an arc surface, and the extension direction of the chuck 71 needs to be parallel to the axial direction. This causes the chuck 71 to bend with the main body of the positioning slider 7. The part of the positioning slider 7 adjacent to the chuck 71, i.e., the bent position, is the neck 72. An anti-interference groove 74 is provided on the side of the neck 72 away from the central axis of the base to avoid interference between the workpiece 16 and the positioning slider 7 when the chuck 71 is clamped too deeply. In other embodiments, the positioning slider 7 may not have an anti-interference groove 74. In this embodiment, interference can be prevented by providing a chamfer or other structure at the edge of the opening of the positioning hole 17 of the workpiece 16.

[0056] Specific embodiment 2 of the centering and clamping device for gear machining provided by this utility model:

[0057] This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the groove 73 is provided on the mating part 82, and the sliding protrusion 84 is provided on the positioning slider 7.

[0058] For details, please refer to the appendix. Figure 2The groove 73 is an annular groove formed on the circumferential surface of the mating part 82. The sliding protrusion 84 is located on the inner side of the end of the positioning slider 7 away from the clasp 71, and the sliding protrusion 84 faces the central axis of the base. In this embodiment, each sliding protrusion 84 slides in conjunction with the groove 73. The working principle is similar to that of Embodiment 1, and will not be described in detail here.

[0059] Specific embodiment 3 of the centering and clamping device for gear machining provided by this utility model:

[0060] This embodiment is based on Embodiment 1, and differs from Embodiment 1 in that, see Appendix. Figure 3 In this embodiment, the transmission structure includes a pin 14 fixedly mounted on the end of the positioning slider 7 away from the chuck 71. The axis of the pin 14 is tangent to the circumferential direction of the base. In this embodiment, the mating part 82 has three circumferentially distributed cantilever arms 15. Each cantilever arm 15 has an oblong hole. The length direction of the oblong hole is the same as the radial direction of the base. The pin 14 is located in the oblong hole and can move along the length direction of the oblong hole.

[0061] This embodiment can also achieve synchronous movement of each positioning slider 7 by using the mating part 82. In order to ensure stable transmission, the guide part 81 in this embodiment needs to be a prism structure so that the transmission body 8 stops rotating relative to the base.

[0062] Specific embodiment 4 of the centering and clamping device for gear machining provided by this utility model:

[0063] This embodiment is based on Embodiment 1, but differs in that the transmission structure in this embodiment is a connecting rod hinged between the mating part and the positioning slider. It can also utilize the mating part to drive the synchronous movement of each positioning slider, which will not be elaborated upon here. To ensure stable transmission, the guide part in this embodiment needs to be a prism structure to prevent the transmission body from rotating relative to the base.

[0064] Specific embodiment 5 of the centering and clamping device for gear machining provided by this utility model:

[0065] This embodiment is based on Embodiment 1, and differs from Embodiment 1 in that, see Appendix. Figure 4 In this embodiment, end plate 3 is not provided. In this embodiment, a flange is provided at the large end of the inner sleeve 2 and a flange is also provided at the corresponding end of the outer sleeve 1, so that the inner sleeve 2 and the outer sleeve 1 are directly fixedly connected.

[0066] Specific embodiment 6 of the centering and clamping device for gear machining provided by this utility model:

[0067] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the base in this embodiment is an integral structure that can be processed using machining or 3D printing technology.

[0068] Specific embodiment 7 of the centering and clamping device for gear machining provided by this utility model:

[0069] This embodiment is based on Embodiment 1, and differs from Embodiment 1 in that, see Appendix. Figure 5 In this embodiment, the guide portion 81 is located below the mating portion 82, and the drive rod 9 is connected to the guide portion 81. Simultaneously, the guide hole in this embodiment also needs to be adjusted according to the position of the guide portion 81.

[0070] In order to better guide the positioning slider 7, the slide 5 is a dovetail groove on the inner conical surface of the outer sleeve 1 in this embodiment, and the positioning slider 7 is also provided with a structure that cooperates with the dovetail groove for guidance.

[0071] Specific embodiment 8 of the centering and clamping device for gear machining provided by this utility model:

[0072] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the positioning slider's locking head is far from the central axis of the base, and the end of the positioning slider that is far from the locking head is close to the central axis of the base. That is, the positioning surface of the base is at the end face of the large end of the inner sleeve.

[0073] In this embodiment, when the drive rod applies a pulling force, each clamp retracts; when the drive rod applies a pushing force, each clamp expands, thereby clamping the workpiece. Compared to Embodiment 1, the initial circular size of each clamp in this embodiment is larger, thus it can be applied to workpieces with larger positioning holes.

[0074] Specific embodiments of the machine tool provided by this utility model:

[0075] The machine tool includes a machine base and a centering clamping device mounted on the machine base. The centering clamping device is any one of the specific embodiments 1-8 of the above-mentioned centering clamping device for gear machining, and will not be described in detail here.

[0076] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A centering and clamping device for gear machining, characterized in that, The device includes a base, a transmission body, and at least three positioning sliders. One axial end of the base is a clamping end for clamping the workpiece. The base is provided with slides that guide each positioning slider. The slides are inclined and their center extensions converge at a point on the central axis of the base. One end of the positioning slider extends out of the clamping end and is a clamp for radially supporting the inner wall of the positioning hole on the workpiece. The transmission body includes a guide part and a mating part. The base is provided with a guide hole for axially guiding the guide part. A transmission structure is provided between the mating part and the positioning sliders for driving each positioning slider to move along the corresponding slide when the transmission body moves axially. The transmission body is connected to a drive rod for driving the transmission body to move axially.

2. The centering and clamping device for gear machining according to claim 1, characterized in that, The chuck of the positioning slider is close to the central axis of the base, and the end of the positioning slider away from the chuck is away from the central axis of the base. The end face of the clamping end of the base is perpendicular to the central axis of the base and this end face constitutes a positioning surface for axial positioning of the workpiece.

3. The centering and clamping device for gear machining according to claim 2, characterized in that, The mating part protrudes radially from the guide part, and a compressed elastic element is provided between the end face of the mating part near the clamping end and the base. The elastic element is used to cooperate with the drive rod to move the mating part away from the clamping end.

4. The centering and clamping device for gear machining according to claim 2 or 3, characterized in that, The part of the positioning slider adjacent to the chuck head is the chuck neck, and an anti-interference groove is provided on the side of the chuck neck away from the central axis of the base.

5. The centering and clamping device for gear machining according to any one of claims 1-3, characterized in that, The base includes an outer sleeve and an inner sleeve mounted inside the outer sleeve in an anti-rotation manner. The outer sleeve has an inner conical surface, and the inner sleeve has an outer conical surface that mates with the inner conical surface. Grooves for forming slides are provided on the inner conical surface of the outer sleeve and / or the outer conical surface of the inner sleeve.

6. The centering and clamping device for gear machining according to claim 5, characterized in that, The inner sleeve has a central hole that extends through the inner sleeve along the axial direction, and the central hole constitutes the guide hole.

7. The centering and clamping device for gear machining according to claim 5, characterized in that, The base also includes an end plate fixedly installed at one axial end of the outer sleeve. The end plate is in stop-fit ​​with the end face of the large end of the inner sleeve. The end plate is provided with a clearance hole or clearance groove for avoiding the positioning slider.

8. The centering and clamping device for gear machining according to any one of claims 1-3, characterized in that, One of the mating parts and the positioning slider has a groove, and the other has a sliding protrusion for sliding with the groove. The sliding protrusion slides relative to the groove in a direction perpendicular to the central axis of the base. The sliding protrusion and the groove constitute a transmission structure.

9. The centering and clamping device for gear machining according to claim 8, characterized in that, The mating part has a disc structure, and the edge of the mating part forms the sliding protrusion.

10. A machine tool, comprising a machine base, characterized in that, The machine base is equipped with a centering and clamping device for gear machining as described in any one of claims 1-9.

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