CN214392373U

CN214392373U - Novel cutting clamp

Info

Publication number: CN214392373U
Application number: CN202023045795.8U
Authority: CN
Inventors: 李庆荣; 李国东
Original assignee: Guangzhou City Polytechnic
Current assignee: Guangzhou City Polytechnic
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-10-15
Anticipated expiration: 2030-12-16

Abstract

The utility model relates to the technical field of machining, a novel cutting fixture is disclosed, including the anchor clamps body, centering top and live center are coaxial to be arranged, centering top axial activity cartridge is internal at the anchor clamps, the specific tail end of anchor clamps is provided with the top elastic component of elastic support centering, it is equipped with the jack catch still to rotate on the anchor clamps body, the front end of definition jack catch is the exposed core, the tail end is the drive end, the shaping has the cam on the drive end, the jack catch on the top roof pressure inclined plane of roof pressure cam when being provided with axial activity, the jack catch has roof pressure inclined plane roof pressure cam so that the clamping position of the tight work piece of exposed core and roof pressure inclined plane break away from the release position of cam so that the exposed core release work piece in its rotation stroke. When a workpiece is machined, the jacking inclined plane of the centering center jacks the cam, the clamping end of the clamping jaw radially clamps the workpiece, the larger the movement of the centering center is, the larger the clamping force of the clamping jaw is, the clamping force is ensured to be completed, the clamping speed and the clamping efficiency are improved, and the clamping precision is ensured.

Description

Novel cutting clamp

Technical Field

The utility model relates to a machining technology field especially relates to a novel cutting fixture.

Background

In the process of cutting, the shaft parts are frequently encountered machining parts, and when the shaft parts are machined, the shaft parts must be correctly positioned and clamped in a machine tool clamp, such as coaxiality, positioning accuracy and the like are ensured, so that the shaft parts always keep correct positions in the whole cutting process, and the machining quality of the parts is ensured.

At present, a plurality of clamping methods are used in the cutting processing of parts, and a common method is to clamp the end part of a shaft part by a chuck and the like, press the other end of the shaft part by a movable top tip and position the shaft part. But the clamping force and the clamping precision can be kept low when the chuck is positioned, but the clamping is troublesome, the clamping efficiency is low, and the labor intensity of workers is high; and if tools such as tool pliers are adopted for clamping, although the clamping speed and the clamping efficiency can be ensured, the clamping precision can not be ensured.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: the utility model provides a novel cutting jig to when guaranteeing work piece clamp force and clamping precision, improve the clamping speed and the efficiency of work piece.

In order to realize the aim, the utility model provides a novel cutting clamp which comprises a clamp body, a centering top and a live center, the centering centre and the live centre are coaxially arranged, the centering centre is axially and movably inserted in the clamp body, the tail end of the fixture body is provided with an elastic part which elastically supports the centering center, the fixture body is also rotatably provided with a clamping jaw, at least three clamping jaws are arranged at intervals along the circumferential direction of the fixture body, the front end of each clamping jaw is defined as a clamping end used for radially clamping a workpiece, the tail end of each clamping jaw is defined as a driving end used for driving the clamping jaws to rotate, a cam is formed on the driving end, a jacking inclined surface which jacks the cam to drive the clamping jaw to rotate when the centering centre moves axially is arranged on the centering centre, the clamping jaw is provided with a clamping position for enabling the clamping end to clamp the workpiece by jacking the cam through the jacking inclined surface in the rotating stroke of the clamping jaw, and a releasing position for enabling the clamping end to release the workpiece by disengaging the jacking inclined surface from the cam.

Preferably, the centering center comprises a centering rod axially movably assembled in the fixture body and a conical head arranged at the front end of the centering rod, the diameter of the centering rod is smaller than the maximum outer diameter of the conical head, the centering rod and the conical head are in transition through a conical surface, and the conical surface forms the jacking inclined surface.

Preferably, the centering rod is in rotation-stopping assembly with the clamp body.

Preferably, the radial thread on the fixture body is provided with a limit screw, the centering rod is provided with a limit groove which is in rotation stop fit with the limit screw, and the limit groove extends along the axial direction of the centering tip.

Preferably, a fixed arm is integrally formed at the front end of the clamp body, the clamping jaw is rotatably assembled on the fixed arm through a pin shaft, the clamping end is located on the front side of the pin shaft, and the driving end is located on the rear side of the pin shaft.

Preferably, the cam and the jaw are of an integrally formed structure, and an outer wall surface of the cam, which is in contact with the centering tip, is a curved surface with a curvature gradually increasing from front to back.

Preferably, the elastic part is a compression spring which is pressed and assembled between the tail end of the centering tip and the clamp body.

Preferably, the clamp body comprises a main body and a force adjusting screw which is assembled at the tail end of the main body in a threaded manner, and one end of the pressure spring is assembled on the force adjusting screw in a pressing manner.

Preferably, the main body is a tapered structure with a gradually smaller outer diameter from front to back.

The embodiment of the utility model provides a novel cutting jig compares with prior art, and its beneficial effect lies in: when a workpiece is machined, an operator places a fixture body in a main shaft taper hole of a machine tool, two ends of the workpiece are respectively abutted against a centering center and a live center, the live center drives the workpiece and the centering center to axially move after the live center is axially pushed, the centering center overcomes the elastic force of an elastic part and axially moves in the fixture body, a jacking inclined plane of the centering center jacks a cam, the cam is arranged on a driving end, the driving end drives a clamping jaw to rotate on the fixture body, the clamping jaw rotates from a release position to a clamping position, a clamping end radially clamps the workpiece, the larger the moving amount of the centering center is, the larger the clamping force of the clamping jaw is, the clamping is completed while the clamping force is ensured, the speed and the efficiency are improved, meanwhile, the three clamping jaws radially limit the workpiece, the centering center is coaxial with the live center, and the clamping precision is ensured; after the machining is finished, the live center is loosened and retreated, the centering center moves forward under the elastic action of the elastic piece, the clamping jaws can be automatically loosened, and the workpiece is convenient to disassemble.

Drawings

FIG. 1 is a schematic structural view of the novel cutting fixture of the present invention when processing a workpiece;

FIG. 2 is a side view of the novel cutting fixture of FIG. 1 with the live center omitted;

fig. 3 is a schematic view of the structure of the centering tip of the novel cutting fixture of fig. 1.

In the figure, 1, a clamp body; 11. a main body; 12. force adjusting screws; 13. a fixed arm; 14. a pin shaft; 2. centering the centre; 21. a centering rod; 22. a conical head; 23. pressing the inclined plane; 24. a limiting groove; 3. a live center; 4. a claw; 41. a cam; 5. a limit screw; 6. a pressure spring; 7. and (5) a workpiece.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

The utility model discloses a novel cutting jig's preferred embodiment, as shown in fig. 1 to 3, this novel cutting jig includes anchor clamps body 1, centering top 2 and live center 3, and centering top 2 and live center 3 are coaxial to be arranged, and centering top 2 and live center 3 are used for the butt respectively at the axial both ends of work piece 7, and anchor clamps body 1 is used for the clamping in the main shaft taper hole of lathe.

The fixture body 1 comprises a main body 11 and a force adjusting screw 12 which is assembled at the tail end of the main body 11 in a threaded mode, the main body 11 is of a hollow structure, a central hole which extends axially and is used for axially inserting the centering tip 2 is formed in the main body 11, and the centering tip 2 is axially movably inserted into the central hole of the fixture body 1. A pressure spring 6 is arranged between the force adjusting screw 12 and the centering tip 2 in a jacking mode, namely one end of the pressure spring 6 is in contact with the force adjusting screw 12, the other end of the pressure spring is in contact with the centering tip 2, and the pressure spring 6 forms an elastic part arranged between the clamp body 1 and the centering tip 2 in a jacking mode. The assembly size of the pressure spring 6 can be adjusted by adjusting the assembly depth of the force adjusting screw 12, so that the elasticity between the pressure spring 6 and the centering center 2 is adjusted, and the centering device is suitable for processing different workpieces 7.

The main body 11 is a tapered structure with a gradually smaller outer diameter from front to back, and the specific size of the main body 11 can be determined by the size of a spindle taper hole of a lathe, so that the clamp body 1 is matched with the spindle taper hole on the lathe. The main body 11 is further provided with a limiting screw 5 in a radial threaded manner, the limiting screw 5 is perpendicular to the center hole of the clamp body 1, a limiting groove 24 in rotation stopping fit with the limiting screw 5 is formed in the centering tip 2, and the limiting groove 24 extends along the axial direction of the centering tip 2. After the centering center 2 is installed, the limiting screw 5 is rotated, the end part of the limiting screw 5 enters the limiting groove 24, and the limiting screw 5 is contacted with the groove wall of the limiting groove 24 to prevent the centering center 2 from rotating; in addition, the limiting groove 24 extends along the axial direction of the centering center 2, and the limiting groove 24 provides space for the axial movement of the centering center 2, so that the limiting screw 5 is prevented from being stopped with the centering center 2 in the axial direction.

The front end of the fixture body 1 is integrally formed with fixing arms 13, the fixing arms 13 are arranged in pairs, the fixing arms 13 have three pairs, and each pair of fixing arms 13 is rotatably provided with a clamping jaw 4. Every pair of fixed arm 13 all is parallel to each other and interval arrangement, rotates between the fixed arm 13 in pairs to be equipped with round pin axle 14, and jack catch 4 rotates through round pin axle 14 and assembles on fixed arm 13, and jack catch 4 is used for radially pressing from both sides tight work piece 7, and fixed arm 13 rotates for jack catch 4 and provides the space, avoids jack catch 4 and anchor clamps body 1 to interfere.

The clamping jaws 4 are three in number, the three clamping jaws 4 are arranged at intervals along the circumferential direction of the clamp body 1, and each clamping jaw 4 is rotatably assembled between a pair of fixed arms 13. The front end of the jaw 4 is defined as a clamping end for radially clamping the workpiece 7, the tail end of the jaw 4 is defined as a driving end for driving the jaw 4 to rotate, the clamping end is positioned on the front side of the pin shaft 14, and the driving end is positioned on the rear side of the pin shaft 14.

The cam 41 is integrally formed at the driving end of the jaw 4, the cam 41 is used for being in contact with the centering centre 2, the centering centre 2 is provided with a jacking inclined surface 23 which is axially movable and jacks the cam 41 to drive the jaw 4 to rotate, the jacking inclined surface 23 is in contact with the cam 41 when the centering centre 2 is circumferentially movable, and the jacking inclined surface 23 drives the cam 41 to rotate around the pin shaft 14, so that the clamping end of the jaw 4 is driven to rotate and the workpiece 7 is radially clamped. The outer wall surface of the cam 41, which is in contact with the centering center 2, is a curved surface with the curvature gradually increasing from front to back, the rotation angle of the jaw 4 is the largest when the jacking inclined surface 23 just contacts the cam 41, so that the jaw 4 can be rapidly clamped on the workpiece 7, the rotation angle of the jaw 4 is gradually reduced along with the axial movement of the centering center 2, and the jaw 4 is placed to damage the workpiece 7 while the clamping force is ensured.

The centering center 2 comprises a centering rod 21 and a conical head 22, the centering rod 21 and the conical head 22 are of an integrally formed structure, the centering rod 21 is used for being axially movably assembled in the clamp body 1, and the conical head 22 is arranged at the front end of the centering rod 21 and is used for being axially abutted against the workpiece 7. The limiting groove 24 is formed in the centering rod 21, and the centering rod 21 is assembled with the clamp body 1 in a rotation stopping mode through the limiting groove 24 and the limiting screw 5. The diameter of the centering rod 21 is smaller than the maximum outer diameter of the conical head 22, the centering rod 21 and the conical head 22 are in transition through a conical surface, the conical surface forms a jacking inclined surface 23, the contact between the conical surface and the cam 41 is smooth, and the cam 41 rotates stably.

When the centering centre 2 moves backwards in the axial direction, the conical surface axially presses the cam 41, the clamping jaw 4 rotates, the clamping end clamps the workpiece 7, and the clamping jaw 4 is positioned at the clamping position; when the centering centre 2 moves forwards axially, the conical surface is separated from the cam 41, the jaw 4 rotates reversely, the clamping end releases the workpiece 7, and the jaw 4 is at the release position.

The utility model discloses a working process does: when a workpiece 7 is machined, an operator loads the clamp body 1 into a main shaft taper hole of a lathe, the lathe is started, the operator holds the workpiece 7 with one hand to enable a center hole at one end of the workpiece 7 to be firstly contacted with the live center 3, and the other hand of the operator drives the live center 3 to feed to enable the center hole at the other end of the workpiece 7 to be limited to be contacted with the centering center 2; continuing feeding the live center 3, enabling the live center 3 to be provided with an east workpiece 7 and the centering center 2 to axially move, enabling the centering center 2 to axially move in a central hole of the clamp body 1 by overcoming the elastic force of the pressure spring 6, enabling the conical surface of the centering center 2 to press against a cam 41 at the driving end of each clamping jaw 4, enabling the three clamping jaws 4 to respectively rotate around the pin shaft 14, enabling the clamping ends to clamp the workpiece 7, and enabling the clamping jaws 4 to be located at the clamping positions at the moment; after the cutting process is finished, an operator loosens the live center 3, the centering center 2 moves axially under the action of the elastic force of the pressure spring 6, the clamping jaw 4 releases the workpiece 7 at the moment, the clamping jaw 4 is in a release position, the workpiece 7 can be detached, and a processing cycle is finished.

To sum up, the embodiment of the utility model provides a novel cutting fixture, when processing the work piece, the operator places the fixture body in the main shaft taper hole of the machine tool, the two ends of the work piece are respectively abutted with the centering centre and the live centre, the live centre drives the work piece and the centering centre to move axially after the live centre is pushed axially, the centering centre overcomes the elastic force of the elastic piece and moves axially in the fixture body, the jacking inclined plane of the centering centre jacks the cam, because the cam is arranged on the driving end, the driving end drives the clamping jaws to rotate on the clamp body, the clamping jaws rotate from the releasing position to the clamping position, the clamping end radially clamps the workpiece, the larger the movement of the centering center is, the larger the clamping force of the clamping jaws is, the clamping is finished while the clamping force is ensured, and the clamping speed and efficiency are improved, meanwhile, the three clamping jaws limit the workpiece in the radial direction, and the centering center and the live center are coaxial, so that the clamping precision is ensured; after the machining is finished, the live center is loosened and retreated, the centering center moves forward under the elastic action of the elastic piece, the clamping jaws can be automatically loosened, and the workpiece is convenient to disassemble.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A novel cutting clamp is characterized by comprising a clamp body, a centering center and a live center, the centering centre and the live centre are coaxially arranged, the centering centre is axially and movably inserted in the clamp body, the tail end of the fixture body is provided with an elastic part which elastically supports the centering center, the fixture body is also rotatably provided with a clamping jaw, at least three clamping jaws are arranged at intervals along the circumferential direction of the fixture body, the front end of each clamping jaw is defined as a clamping end used for radially clamping a workpiece, the tail end of each clamping jaw is defined as a driving end used for driving the clamping jaws to rotate, a cam is formed on the driving end, a jacking inclined surface which jacks the cam to drive the clamping jaw to rotate when the centering centre moves axially is arranged on the centering centre, the clamping jaw is provided with a clamping position for enabling the clamping end to clamp the workpiece by jacking the cam through the jacking inclined surface in the rotating stroke of the clamping jaw, and a releasing position for enabling the clamping end to release the workpiece by disengaging the jacking inclined surface from the cam.

2. The novel cutting clamp according to claim 1, wherein the centering center comprises a centering rod movably assembled in the clamp body in the axial direction and a conical head arranged at the front end of the centering rod, the diameter of the centering rod is smaller than the maximum outer diameter of the conical head, and the centering rod and the conical head are in transition through a conical surface which forms the jacking slope.

3. The novel cutting fixture of claim 2, wherein the centering bar is in a detent assembly with the fixture body.

4. The novel cutting clamp according to claim 3, wherein the clamp body is provided with a limiting screw in a radial thread manner, the centering rod is provided with a limiting groove in rotation stopping fit with the limiting screw, and the limiting groove extends along the axial direction of the centering tip.

5. The novel cutting clamp as claimed in any one of claims 1 to 4, wherein a fixed arm is integrally formed at the front end of the clamp body, the jaw is rotatably assembled on the fixed arm through a pin shaft, the clamping end is located at the front side of the pin shaft, and the driving end is located at the rear side of the pin shaft.

6. The novel cutting clamp according to claim 5, wherein the cam and the jaw are of an integrally formed structure, and the outer wall surface of the cam, which is in contact with the centering tip, is a curved surface with a gradually increasing curvature from front to back.

7. The novel cutting fixture of any one of claims 1-4, wherein the resilient member is a compression spring press-fitted between the rear end of the centering tip and the fixture body.

8. The novel cutting clamp of claim 7, wherein the clamp body comprises a main body and a force adjusting screw which is assembled at the tail end of the main body in a threaded manner, and one end of the pressure spring is assembled on the force adjusting screw in an abutting manner.

9. The novel cutting fixture of claim 8, wherein the body is a tapered structure having a gradually decreasing outer diameter from front to back.