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CN-121989062-A - Clamp and machine tool

CN121989062ACN 121989062 ACN121989062 ACN 121989062ACN-121989062-A

Abstract

The invention discloses a clamp and a machine tool, and relates to the technical field of clamps. The fixture comprises a supporting component and a tensioning component, wherein the supporting component is used for supporting a workpiece through a supporting part provided with the supporting component, and the tensioning part of the tensioning component protrudes out of the supporting part and penetrates through a central hole of the workpiece. Because the lateral wall of the tensioning part is provided with a plurality of convex parts, concave parts are formed between the convex parts, when the workpiece is required to be clamped, the tensioning part drives the convex parts to move along the direction away from the central axis of the tensioning part, the convex parts can be abutted with the first hole section of the central hole, and the position of the workpiece in the radial direction can be effectively limited. The concave part is arranged at intervals with the second hole section of the central hole, so that the concave part can not transmit the pressure generated by the tensioning part to the workpiece, the protruding amplitude of the outer wall of the workpiece can be reduced, and the machining precision of the workpiece is improved.

Inventors

  • FENG YANNAN
  • GAO BOTAO

Assignees

  • 广东极亚精机科技有限公司

Dates

Publication Date
20260508
Application Date
20241030

Claims (16)

  1. 1. The anchor clamps for centre gripping is equipped with centre bore and a plurality of encircleing the work piece of through-hole that the centre bore set up, its characterized in that, anchor clamps include: a support assembly including a support portion for supporting an end face of the workpiece; The tensioning assembly is connected to the supporting assembly and comprises a tensioning part and a plurality of convex parts, the tensioning part protrudes from the supporting part along the axial direction of the clamp and can penetrate through the central hole, the convex parts are connected to the side wall of the tensioning part and are arranged at intervals along the circumferential direction of the tensioning part, and concave parts are formed between the adjacent convex parts; The tightening part can drive the convex part to move along the direction close to or far away from the hole wall of the central hole, when the tightening part is abutted to the hole wall of the central hole, the convex part is abutted to a first hole section of the central hole, the first hole section is a hole section of the through hole corresponding to the central hole along the radial direction of the workpiece, the concave part and a second hole section of the central hole are arranged at intervals, and the second hole section is a hole section of the central hole corresponding to the radial direction of the workpiece between two adjacent through holes.
  2. 2. The jig according to claim 1, wherein a maximum distance between the side wall of the convex portion and the side wall of the concave portion in the radial direction of the tension portion is H, satisfying that 5 μm≤H≤1000 μm.
  3. 3. The fixture of claim 1, wherein the support portion is fixedly connected with a first positioning block for positioning engagement with one of the through holes of the workpiece.
  4. 4. The fixture of claim 3, wherein the fixture further comprises a thimble and an elastic member, the side wall of the first positioning block is provided with a mounting hole, the elastic member is arranged in the mounting hole, one end of the thimble is arranged in the mounting hole and connected with the elastic member, the other end of the thimble protrudes out of the mounting hole, and the thimble can be abutted against the side wall of the through hole under the action of the elastic force of the elastic member.
  5. 5. The fixture of claim 3, wherein the support portion is fixedly connected with a second positioning block, the second positioning block is arranged at intervals from the first positioning block along the circumferential direction of the tensioning portion, and the second positioning block is used for being matched with the other through hole of the workpiece in a positioning manner.
  6. 6. The fixture of claim 1, wherein the support assembly further comprises a clamping portion, the clamping portion is located on a side of the tensioning portion away from the support portion and is spaced apart from the support portion, and a clamping space for clamping the workpiece is formed between the clamping portion and the support portion.
  7. 7. The clamp of claim 6, wherein the clamping portion is detachably connected to the tensioning portion.
  8. 8. The fixture of claim 7, wherein a positioning seat is arranged at one end of the tensioning part, which is far away from the supporting part, and the maximum outer diameter of the positioning seat is smaller than that of the tensioning part, a positioning step is formed at one end of the tensioning part, which faces the positioning seat, and a positioning hole is formed in the clamping part, and the clamping part is sleeved on the positioning seat through the positioning hole and is abutted against the positioning step.
  9. 9. The fixture of claim 8, wherein the end of the positioning seat away from the tensioning part is provided with a connecting shaft, and the fixture further comprises a fastener fixedly connected to the connecting shaft and abutted against the clamping part.
  10. 10. The jig according to claim 7, wherein the support portion is provided with a first abutting portion on a side thereof facing the holding portion, the first abutting portion being provided along an extending direction of an edge of the support portion, and the holding portion is provided with a second abutting portion on a side thereof facing the holding portion, the second abutting portion being provided along an extending direction of an edge of the holding portion.
  11. 11. The fixture of claim 1, wherein the tensioning part comprises a main body and a flexible loop, a liquid inlet channel is arranged in the main body, a liquid storage tank is arranged around the outer wall of the main body, the flexible loop is fixedly connected to the outer wall of the main body and covers the liquid storage tank, a liquid storage space communicated with the liquid inlet channel is formed between the flexible loop and the inner wall of the liquid storage tank, and the convex part and the concave part are arranged on the outer wall of the flexible loop.
  12. 12. The fixture of claim 11, wherein the support portion and the body are integrally formed, and the inlet of the liquid inlet channel is formed in the outer side wall of the support portion.
  13. 13. The fixture of claim 1, wherein the supporting portion is provided with an avoidance hole, the tensioning portion is arranged in a penetrating manner in the avoidance hole and is arranged at intervals with the hole wall of the avoidance hole, the tensioning portion comprises a plurality of fan-shaped portions and a plurality of elastic portions, the fan-shaped portions are arranged at intervals along the circumferential direction of the fixture, the elastic portions are arranged between the adjacent fan-shaped portions, and a taper hole is formed by encircling one end of the fan-shaped portions and one end of the elastic portions, which faces the central axis of the fixture; The clamp further comprises a conical rod, the conical rod is arranged in the conical hole in a penetrating mode, the conical rod is provided with a conical surface, the conical surface is in butt joint with the side wall of the conical hole, and the conical rod is used for enabling the fan-shaped part to move in a direction away from the central axis; The outer wall of the fan-shaped part is provided with the convex part, the convex part protrudes out of the elastic part along the radial direction of the tensioning part, and the concave part is formed between the adjacent convex part and the outer side wall of the elastic part.
  14. 14. The anchor clamps for centre gripping is equipped with centre bore and a plurality of encircleing the work piece of through-hole that the centre bore set up, its characterized in that, anchor clamps include: a support assembly including a support portion for supporting an end face of the workpiece; the tensioning assembly is connected to the supporting assembly and comprises a tensioning part, and the tensioning part protrudes out of the supporting part and can be arranged in the central hole in a penetrating mode; The annular sheet part is sleeved on the outer side wall of the tensioning part, a plurality of convex parts are arranged on the outer side wall of the annular sheet part, the convex parts are arranged at intervals along the circumferential direction of the annular sheet part, and concave parts are formed between the adjacent convex parts; The tensioning part can drive the convex part to move along the direction close to or far away from the hole wall of the central hole, when the annular sheet part is abutted against the hole wall of the central hole, the convex part is abutted against a first hole section of the central hole, the first hole section is a hole section of the through hole corresponding to the central hole along the radial direction of the workpiece, the concave part and a second hole section of the central hole are arranged at intervals, and the second hole section is a hole section of the central hole corresponding to the radial direction of the workpiece between two adjacent through holes.
  15. 15. The jig according to claim 14, wherein one end of the ring piece portion facing the supporting portion is provided with one of a positioning groove and a positioning projection which are positioned in cooperation, and one side of the supporting portion facing the ring piece portion is provided with the other one of the positioning groove and the positioning projection.
  16. 16. Machine tool, characterized in that it comprises a clamp according to any one of claims 1 to 15.

Description

Clamp and machine tool Technical Field The invention relates to the technical field of clamps, in particular to a clamp and a machine tool. Background The workpiece is required to be positioned by a fixture prior to machining. For example, when the cycloidal gear of the RV reducer is to be hobbing or grinding, a jig is required to fix the cycloidal gear. The cycloid wheel is provided with a central hole, and the cycloid wheel is sleeved on the tensioning part of the clamp through the central hole, so that the outer diameter size of the tensioning part can be increased, and the position of the cycloid wheel is limited. Because the cycloid wheel is also provided with a plurality of through holes, for example, a special-shaped hole and a crank shaft hole are formed, the tension part can generate larger pressure when expanding, and the pressure is easily transmitted to the outer wall of the cycloid wheel through a structure between the special-shaped hole and the crank shaft hole, so that the outer wall of the corresponding part of the cycloid wheel is raised. After the cycloid gear finishes the outer teeth and loosens the clamp, the convex outer wall of the cycloid gear can retract, so that the radial runout of the outer teeth is poor, and the pitch error is increased. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the clamp which can reduce the protruding amplitude of the outer wall of the workpiece so as to improve the machining precision. The invention further provides a machine tool with the clamp. A jig according to an embodiment of the first aspect of the present invention for holding a workpiece provided with a center hole and a plurality of through holes provided around the center hole, the jig including a support assembly including a support portion for supporting an end face of the workpiece; The tensioning assembly is connected to the supporting assembly and comprises a tensioning part and a plurality of convex parts, the tensioning part protrudes from the supporting part along the axial direction of the clamp and can penetrate through the central hole, the convex parts are connected to the side wall of the tensioning part and are arranged at intervals along the circumferential direction of the tensioning part, and concave parts are formed between the adjacent convex parts; The tightening part can drive the convex part to move along the direction close to or far away from the hole wall of the central hole, when the tightening part is abutted to the hole wall of the central hole, the convex part is abutted to a first hole section of the central hole, the first hole section is a hole section of the through hole corresponding to the central hole along the radial direction of the workpiece, the concave part and a second hole section of the central hole are arranged at intervals, and the second hole section is a hole section of the central hole corresponding to the radial direction of the workpiece between two adjacent through holes. The clamp provided by the embodiment of the invention has at least the following beneficial effects: The supporting part of the supporting component is used for supporting the workpiece, and the tensioning part of the tensioning component protrudes out of the supporting part and penetrates through the center hole of the workpiece. Because the lateral wall of the tensioning part is provided with a plurality of convex parts, concave parts are formed between the convex parts, when the workpiece is required to be clamped, the tensioning part drives the convex parts to move along the direction away from the central axis of the tensioning part, the convex parts can be abutted with the first hole section of the central hole, and the position of the workpiece in the radial direction can be effectively limited. The concave part is arranged at intervals with the second hole section of the central hole, so that the concave part can not transmit the pressure generated by the tensioning part to the workpiece, the protruding amplitude of the outer wall of the workpiece can be reduced, and the machining precision of the workpiece is improved. According to some embodiments of the invention, a maximum distance between the sidewalls of the protrusions and the sidewalls of the recesses along a radial direction of the jig is H, satisfying that 5 μm≤H≤1000 μm. According to some embodiments of the invention, the support portion is fixedly connected with a first positioning block, and the first positioning block is used for being matched with one through hole of the workpiece in a positioning way. According to some embodiments of the invention, the clamp further comprises a thimble and an elastic piece, the side wall of the first positioning block is provided with a mounting hole, the elastic piece is arranged in the mounting hole, one end of the thimble is arranged in the mounting hole