CN111203555A

CN111203555A - Clamp for processing circular thin-wall part

Info

Publication number: CN111203555A
Application number: CN202010167616.3A
Authority: CN
Inventors: 陈华
Original assignee: Chongqing He Shuo Precision Forging Co Ltd
Current assignee: Chongqing He Shuo Precision Forging Co Ltd
Priority date: 2020-03-11
Filing date: 2020-03-11
Publication date: 2020-05-29

Abstract

The invention relates to a clamp for processing a circular thin-walled part, which comprises a disk body, a fixed seat and a clamping jaw, wherein the fixed seat is annularly arrayed on the disk body; the front part of the clamping jaw is folded to form a hook claw for clamping; the end part of the hook claw is provided with an inclined surface; a cushion block for tightly abutting against the end face of a workpiece is arranged on the fixed seat on the inner side of the hook claw; an annular groove is formed in the side wall of the workpiece; the end part of the hook claw extends into the groove, the inclined surface of the hook claw is abutted to the notch of the groove, and the workpiece is driven to abut against the cushion block. By adopting the technical scheme of the invention, the inclined surface is utilized to tightly abut against the groove port on the side wall of the workpiece, so that radial clamping force and axial thrust towards the cushion block can be provided for the workpiece. The clamping jaw can firmly clamp the workpiece. And the clamp exerts acting force on the workpiece through the inclined surface, and the acting force can be decomposed into smaller component force along the axial direction and the radial direction of the workpiece, so that the risk of radial deformation of the workpiece can be effectively reduced, the roundness of the workpiece is ensured, and the yield is improved.

Description

Clamp for processing circular thin-wall part

Technical Field

The invention relates to the technical field of clamps, in particular to a clamp for machining a circular thin-wall part.

Background

The chuck is a mechanical device used for clamping a circular workpiece on a machine tool, and positions the workpiece from the side wall of the circular workpiece by utilizing the radial movement of movable clamping jaws uniformly distributed on a chuck body.

When a round thin-wall workpiece is machined, the existing chuck can only clamp the side wall of the round thin-wall workpiece, the workpiece fixed on the chuck is stressed singly, and the workpiece can be fixed firmly only by large radial clamping force. However, the large radial clamping force tends to deform the workpiece, resulting in the out-of-roundness of the workpiece meeting performance requirements.

Disclosure of Invention

The method aims to solve the problem that the roundness does not meet the performance requirement because the circular thin-wall workpiece is stressed singly and is easy to deform. The invention provides a clamp for processing a circular thin-wall part, which is characterized in that a hook claw at the front end of a clamping jaw is provided with an inclined surface, and the inclined surface is used for applying axial and radial acting forces to a workpiece, so that the workpiece is ensured to be stressed uniformly and is not easy to deform.

In order to achieve the purpose, the invention adopts the technical scheme that:

a clamp for processing a circular thin-wall part comprises a disk body, a fixed seat and a clamping jaw, wherein the fixed seat is annularly arrayed on the disk body; the front part of the clamping jaw is folded to form a hook claw for clamping; the end part of the hook claw is provided with an inclined surface; a cushion block for tightly abutting against the end face of a workpiece is arranged on the fixed seat on the inner side of the hook claw; an annular groove is formed in the side wall of the workpiece; the end part of the hook claw extends into the groove, the inclined surface of the hook claw is abutted to the notch of the groove, and the workpiece is driven to abut against the cushion block.

By adopting the technical scheme of the invention, when the circular thin-wall workpiece is clamped, the inclined surface is abutted against the groove port on the side wall of the workpiece, so that radial clamping force and axial thrust towards the cushion block can be provided for the workpiece. The radial clamping force limits the radial runout of the workpiece and is convenient for centering the workpiece. The axial thrust makes the terminal surface of work piece support and lean on the cushion, restricts the axial displacement of work piece, guarantees that the clamping jaw can be with the work piece centre gripping firm. The cushion can avoid the terminal surface of work piece impaired, guarantees the work piece quality. And the clamp of the scheme applies acting force to the workpiece through the inclined surface, the acting force can be decomposed into smaller component force along the axial direction and the radial direction of the workpiece, and compared with the existing mode of applying single acting force from the radial direction of the workpiece, the clamp can effectively reduce the risk of radial deformation of the workpiece, ensure the roundness of the workpiece and improve the yield.

Preferably, the middle part of the clamping jaw is provided with a pin hole; a pin is arranged in the pin hole in a penetrating manner to hinge the clamping jaw on the fixed seat; the rear end of the clamping jaw is connected with a pull rod for pushing and pulling the clamping jaw.

The rear end of the clamping jaw is pulled or pushed by the pull rod, so that the front end of the clamping jaw can be outwards opened or inwards folded by taking the pin hole as an original point, the workpiece is clamped or loosened, and the clamping jaw is convenient to use.

Preferably, the fixed seat is provided with a U-shaped groove; the middle part of the clamping jaw is hinged in the U-shaped groove. The space occupied by the clamping jaw is reduced, and the structure is ensured to be compact.

Preferably, the pull rod is fixedly provided with a connecting disc; the edge of the connecting disc is provided with a notch corresponding to the mounting seat; the rear end of the clamping jaw is provided with a strip-shaped groove; the clamping jaw is hinged in the notch through a pin shaft penetrating in the strip-shaped groove.

The pull rod is connected with the plurality of clamping jaws in the annular array through the connecting disc, so that the opening and closing processes of the clamping jaws can be synchronously performed, the structure is simple, and the accuracy is high. And the bar-shaped groove at the rear end of the clamping jaw can allow the deflection of the rear end of the clamping jaw, so that the interference is avoided.

Preferably, the pull rod penetrates through a avoidance hole in the middle of the disc body and is connected with a hydraulic cylinder for driving. The hydraulic cylinder drives the pull rod, so that the moving distance of the pull rod can be accurately controlled, and the clamping force provided by the clamping jaw can be ensured.

Preferably, a hollow connecting column is formed in the middle of the connecting disc in a protruding mode; an internal thread is arranged in the connecting column and is in threaded connection with one end of the pull rod. The installation is convenient, convenient to detach.

The invention has the advantages that acting force can be applied from the axial direction and the radial direction of the workpiece, and the problem that the roundness of the workpiece does not meet the requirement because the workpiece is deformed due to single radial force is avoided. And the clamping jaw can rotate synchronously, and the accuracy is high. The whole clamp is compact in structure and convenient to disassemble and assemble.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Figure 2 is a schematic view of the jaw of figure 1.

Fig. 3 is a structural schematic diagram of the tray body.

Fig. 4 is a schematic diagram of the structure of the connection pad.

The reference numerals and components referred to in the drawings are as follows:

the clamping device comprises a plate body 1, an avoiding hole 11, a fixed seat 2, a U-shaped groove 21, a clamping jaw 3, a hook claw 31, an inclined surface 32, a strip-shaped groove 33, a pin hole 34, a cushion block 4, a workpiece 5, a groove 51, a pull rod 6, a connecting disc 7, a connecting column 71 and a notch 72.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

As shown in fig. 1, a clamp for a circular thin-wall workpiece 5 comprises a disk-shaped disk body 1, a fixed seat 2 in an annular array and a clamping jaw 3 arranged on the fixed seat 2, wherein the fixed seat 2 is integrally formed on the surface of the disk body 1; the front part of the clamping jaw 3 is downwards folded to form a hook claw 31 for clamping; the end of the hook claw 31 is provided with an inclined surface 32. The inclined surface 32 is provided inside the hook claw 31 and is inclined from top to bottom and from inside to outside. A cushion block 4 for tightly abutting against the end face of the workpiece 5 is arranged on the fixed seat 2 at the inner side of the hook claw 31; an annular groove 51 is formed in the side wall of the workpiece 5; the end part of the hook claw 31 extends into the groove 51, the inclined surface 32 of the hook claw abuts against the groove 51 close to the notch on the inner side of the hook claw 31, and the workpiece 5 is driven to abut against the cushion block 4.

As shown in fig. 2, the clamping jaw 3 is hook-shaped, and a pin hole 34 is formed in the middle of the clamping jaw 3; a pin is arranged in the pin hole 34 in a penetrating way to hinge the clamping jaw 3 on the fixed seat 2; the rear end of the clamping jaw 3 is connected with a pull rod 6 for pushing and pulling the clamping jaw 3. As shown in fig. 3, in order to ensure a compact structure, a U-shaped groove 21 is formed on the fixed seat 2; the clamping jaw 3 is arranged in the U-shaped groove 21, and a pin penetrates through a pin hole 34 in the middle of the clamping jaw 3; and the clamping jaw 3 is hinged on the fixed seat 2. For convenient control, the pull rod 6 passes the avoidance hole 11 in the middle of the disk body 1 and is connected with a hydraulic cylinder for driving.

As shown in fig. 4, in order to ensure the synchronization of the clamping jaws 3, a connecting disc 7 is mounted on the pull rod 6, and a hollow connecting column 71 is formed in the middle of the connecting disc 7 in a protruding manner; an internal thread is arranged in the connecting column 71 and is in threaded connection with one end of the pull rod 6. The edge of the connecting disc 7 is provided with a notch 72 corresponding to the mounting seat; a strip U-shaped groove 21 is arranged at the rear end of the clamping jaw 3; the clamping jaw 3 is hinged in the notch 72 through a pin shaft arranged in the U-shaped groove 21 in a penetrating way.

Before processing, the pull rod 6 is driven to be away from the disc body 1 through the driving hydraulic cylinder, and the pull rod 6 drives the clamping jaw 3 to rotate around the pin hole 34 in the moving process. The hook claw 31 at the front part of the clamping jaw 3 rotates towards the inner side of the disc body 1, extends into the annular groove 51 on the side wall of the workpiece 5, and abuts against the notch of the groove 51 by the inclined surface 32 on the hook claw 31. The inclined surface 32 provides a radial clamping force and an axial thrust force to the workpiece 5, and the clamping force centers and radially positions the workpiece 5; the axial thrust pushes the workpiece 5, so that the end face of the workpiece 5 abuts against the cushion block 4, and the whole workpiece 5 is clamped. After the machining is finished, the pull rod 6 is driven to be close to the disc body 1 through the hydraulic cylinder, the clamping jaw 3 rotates reversely, the workpiece 5 is loosened, and the workpiece taking is convenient.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended as illustrations of the principles of the invention, and that other variations and modifications may be made without departing from the spirit and scope of the invention, which variations and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A clamp for processing a circular thin-wall part comprises a plate body (1), fixing seats (2) annularly arrayed on the plate body (1), and clamping jaws (3) arranged on the fixing seats (2), and is characterized in that the front parts of the clamping jaws (3) are turned over to form hook claws (31) for clamping; the end part of the hook claw (31) is provided with an inclined surface (32); a cushion block (4) for tightly abutting against the end face of the workpiece (5) is arranged on the fixed seat (2) at the inner side of the hook claw (31); an annular groove (51) is formed in the side wall of the workpiece (5); the end part of the hook claw (31) extends into the groove (51), the inclined surface (32) of the hook claw is abutted to the notch of the groove (51), and the workpiece (5) is driven to abut against the cushion block (4).

2. The jig for processing a circular thin-walled workpiece according to claim 1, characterized in that: a pin hole (34) is formed in the middle of the clamping jaw (3); a pin is arranged in the pin hole (34) in a penetrating way to hinge the clamping jaw (3) on the fixed seat (2); the rear end of the clamping jaw (3) is connected with a pull rod (6) for pushing and pulling the clamping jaw (3).

3. The clamp for processing the circular thin-walled workpiece according to claim 2, wherein the fixed seat (2) is provided with a U-shaped groove (21); the middle part of the clamping jaw (3) is hinged in the U-shaped groove (21).

4. The clamp for processing the circular thin-walled workpiece according to claim 3, wherein a connecting disc (7) is fixed on the pull rod (6); the edge of the connecting disc (7) is provided with a notch (72) corresponding to the mounting seat; the rear end of the clamping jaw (3) is provided with a strip U-shaped groove (21); the clamping jaw (3) is hinged in the notch (72) through a pin shaft arranged in the U-shaped groove (21) in a penetrating way.

5. The clamp for processing the circular thin-walled workpiece according to claim 2, wherein the pull rod (6) penetrates through an avoidance hole (11) in the middle of the plate body (1) and is connected with a hydraulic cylinder for driving.

6. The clamp for processing the circular thin-walled workpiece according to claim 4, wherein a hollow connecting column (71) is formed in the middle of the connecting disc (7) in a protruding mode; an internal thread is arranged in the connecting column (71) and is in threaded connection with one end of the pull rod (6).