CN106914786A - A kind of inner hole of workpiece fixer for machining - Google Patents

Abstract

The present invention provides a kind of inner hole of workpiece fixer for machining, the fixing device includes base, locating piece, fixture, the locating piece is connected with the base, the fixture is arranged on the base and is connected with the base, the locating piece is used to determine the position of the fixture, the fixture is used to clamp the workpiece for needing to carry out interior hole machined, pyramidal projections structure is set on the fixture, the workpiece surface is penetrated using raised structures, reduce clamping force while to ensure and clamp, improve the precision of work pieces process.

Description

Fixing device for workpiece inner hole processing

technical field

The invention relates to the technical field of fixtures, in particular to a fixing device based on inner hole processing and its application.

Background technique

At present, when many thin-walled rotating aluminum alloy workpieces are processed on ordinary CNC lathes, hydraulic three-jaws are usually used or welding materials are added to the three-jaws to increase the clamping of the contact surface with the workpiece. The traditional three-jaw When the jaw chuck is clamped, when the clamping force is released, the workpiece is seriously deformed, and the roundness tolerance of the inner hole exceeds the requirement of the inner hole size tolerance. At the same time, the roundness of the inner hole is irregular, and the tightening and positioning are unstable during subsequent processing. It directly affects the machining accuracy. In the final analysis, the workpiece is too thin and deformed during the clamping process.

In order to reduce the deformation, the clamping force is sometimes reduced during processing. Although the deformation is slightly improved in this way, due to the irregular outer circle of the pipe, the clamping positioning is unstable, and the clamping may not be tight. The clamping force not only cannot guarantee that the deformation of the processed parts is within the tolerance range, but also poses safety hazards.

Contents of the invention

The technical problem to be solved by the present invention is to solve the problem that the clamping force of the fixture device for the processing of the inner hole of the existing thin-walled workpiece is too large, which causes the workpiece to be deformed by compression, so that the size of the inner hole exceeds the required accuracy. A workpiece inner hole processing and fixing device, the fixing device includes a base, a positioning block, and a clamp, the positioning block is connected to the base, the clamp is arranged on the base and connected to the base, and the positioning block is used In order to determine the position of the clamp, the clamp is used to clamp the workpiece that needs to be processed in the inner hole. The tapered protrusion structure is arranged on the clamp, and the protrusion structure is used to penetrate into the surface of the workpiece to ensure clamping while reducing the The small clamping force improves the precision of workpiece processing, and through the flexible connection design of the clamp and the base, it can be clamped even when the outer surface of the processed workpiece is irregular, which improves the versatility of the fixing device.

In order to solve the problems of the technologies described above, the technical solution provided by the invention is:

A workpiece inner hole processing and fixing device, the fixing device includes a base, a positioning block, and a clamp, the positioning block is connected to the base, the clamp is arranged on the base and connected to the base, the positioning The block is used to determine the position of the clamp, and the clamp is used to clamp the workpiece that needs to be machined with inner holes.

The fixing device includes a three-part structure, the three-part structure is the same in size and shape, and the three-part structure is arranged around a circle center to jointly realize the fixation of the workpiece, the inside of the clamp is arranged as an arc structure, and The inner sides of the clamps of the three-part structure jointly form a circular structure.

The clamp is movably connected to the base, and the clamp rotates left and right or moves up and down relative to the base. Both the clamp and the base are provided with pin holes, and cylindrical pins are placed in the pin holes to connect the The clamp and the base realize relative movement between the clamp and the base.

A circular groove is arranged in the middle of the inside of the fixture, and a plurality of protrusion structures are arranged on both sides of the groove inside the fixture for clamping the workpiece, and the protrusion structures are neatly arranged in multiple rows and rows.

The protrusion structure is a conical structure, the sharp end of the conical structure faces the center of the circle, and the angle formed by two adjacent surfaces of the adjacent conical structures ranges from 30 degrees to 90 degrees.

The beneficial effects of the present invention are:

1. Using the workpiece inner hole processing and fixing device of the present invention, the tapered protrusion structure provided on the fixture is used to penetrate the surface of the workpiece to a certain depth, so that the workpiece does not only rely on friction during the clamping process, thereby greatly increasing the clamping force. Excellent stability, which solves the problem of unstable clamping under the action of low clamping force, and ensures the safety of the workpiece during high-speed rotation;

2. Using the workpiece inner hole processing and fixing device of the present invention, utilizing the movable connection design of the fixture and the base, it can not only fix the workpiece with surface defects, but also reduce the requirements for the workpiece and improve the versatility of the fixing device ;

3. Using the workpiece inner hole processing and fixing device of the present invention, the tapered protrusion structure is used to reduce the clamping force and effectively reduce the deformation of the thin-walled workpiece. After the clamping force is removed, the workpiece shape variable is small, and the inner hole size meets Dimensional tolerance requirements;

4. Using the workpiece inner hole processing and fixing device of the present invention, the positioning block is installed in a convenient and replaceable manner, and is applicable to workpieces of various types and sizes, which greatly improves the versatility of the workpiece fixing device.

Description of drawings

Fig. 1 is a schematic top view of the structure of the workpiece inner hole processing and fixing device of the present invention;

Fig. 2 is a three-dimensional structural schematic diagram of a single part of the workpiece inner hole processing and fixing device of the present invention;

Fig. 3 is a schematic structural view of the jig of the workpiece inner hole machining and fixing device of the present invention.

detailed description

The invention discloses a workpiece inner hole processing and fixing device, which can be realized by those skilled in the art by referring to the content of this article and appropriately improving process parameters. It needs to be pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention, and relevant personnel can obviously make changes without departing from the content, spirit and scope of the present invention. Changes or appropriate changes and combinations are made to the content described herein to realize and apply the technology of the present invention.

In the present invention, unless otherwise specified, the scientific and technical terms used herein have the meanings commonly understood by those skilled in the art.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with specific examples.

At present, when making or processing the inner hole of a workpiece, a fixture is used to fix the workpiece to facilitate its processing. The commonly used fixture is a fixture structure, that is, the workpiece is clamped by a fixture, and then the workpiece is further processed. However, because often the workpiece The outer wall of the workpiece is relatively thin. In order to clamp the workpiece, better process the workpiece and prevent safety accidents, the fixture will give a certain clamping force, and the clamping force will cause a certain deformation of the workpiece. When the processing is completed And after canceling the clamping force, the workpiece will have a certain return change, which will cause a change in the size of the inner hole of the workpiece. The greater the clamping force, the greater the deformation, and the return of the workpiece after processing The greater the change, the greater the size deviation of the workpiece inner hole. Therefore, in order to ensure that the size of the workpiece inner hole meets the requirements, it is necessary to control the clamping force of the fixture. Considering safety issues, it cannot be simply reduced. The clamping force is used to reduce the deformation. The technical solution proposed by the invention can not only reduce the clamping force, but also fix the workpiece well, and reduce the error of the inner hole size of the workpiece while ensuring safety.

The specific embodiment of the workpiece inner hole processing and fixing device of the present invention will be described in detail below in conjunction with the accompanying drawings:

Fig. 1 is a schematic top view of the structure of the workpiece inner hole processing and fixing device of the present invention. The fixing device includes three parts of the structure, and the three parts of the structure are the same in size and shape, and the three parts of the structure are independent of each other, and the three parts The structure is arranged around a center of a circle to jointly realize the fixation of the workpiece. The inner side of the fixture 4 is set as a circular arc structure, and the inner side of the three-part structure together forms a circular structure. The three-part structure is respectively connected with the machine tool spindle and other mechanisms. The three-part structure is driven by the spindle of the machine tool to move to realize operations such as loading, clamping, and unloading of the workpiece.

A single part of the fixing device includes a base 1, a positioning block 2, and a clamp 4, the positioning block 2 is connected to the base 1, the clamp 4 is arranged on the base 1 and connected to the base 1, the The positioning block 2 is used to determine the position of the clamp 4, and the clamp 4 is used to clamp the workpiece that needs to be processed in the inner hole. The base 1 and the positioning block 2 are provided with corresponding screw holes and are connected by the first screw. 3. Fixedly connect the base 1 and the positioning block 2. A screw hole is provided on the base away from the center of the circle and the base 1 is fixedly connected to the machine tool spindle by a second screw 6. The base 1 and the clamp Corresponding pin holes are set on 4 and connected by cylindrical pin 5.

Fig. 2 is a three-dimensional structural schematic diagram of a single part of the workpiece inner hole processing and fixing device of the present invention, the base 1 is connected with the machine tool spindle and used to support the entire fixing device, the clamp 4 is movably connected with the base 1, and the clamp 4 Relative to the base 1, it can be rotated left and right or slightly moved up and down. Pin holes are set on the clamp 4 and the base 1, and cylindrical pins 5 are placed in the pin holes to connect the clamp 4 and the base 1. base 1 and realize the relative movement between the clamp 4 and the base 1, the positioning block 2 is connected with the base through the first screw 3, and the positioning block 2 is used to fix the clamp 4 position, the clamp 4 rotates left and right around the cylindrical pin 5 until it touches the positioning block 2, the positioning block 2 restricts the continuous rotation of the clamp 4, and the base 1, positioning block 2, Fixtures 4 jointly realize the fixation of the workpiece, and since the fixture 4 can move slightly up and down along the cylindrical pin 5 and can rotate left and right around the cylindrical pin 5, and the final position is determined by the positioning block 2, it can ensure When the outer surface of the workpiece is uneven or irregular, the clamp 4 can realize sufficient contact between the clamp 4 and the workpiece by moving up and down or rotating left and right, thereby improving the clamping strength.

Further, a circular groove is provided in the middle part of the inside of the clamp 4, and a plurality of protrusion structures are provided on both sides of the groove inside the clamp 4 to clamp the workpiece. The protrusion structures are arranged in multiple rows and columns The shapes are neatly arranged, the protruding structure is a conical structure, and the sharp end of the conical structure faces the center of the circle. When the workpiece is placed inside the clamp 4, the clamp 4 provides inward clamping The force pushes the tapered structure into the outer surface of the workpiece, further strengthening the fixation of the workpiece, and due to the piercing of the tapered structure, the clamping force can be reduced, thereby reducing the The amount of deformation in the workpiece processing process realizes that the inner hole processing size of the workpiece meets the specified error range. As shown in Figure 3, it is a structural schematic diagram of the workpiece inner hole processing fixture fixture of the present invention, and the adjacent tapered structures are adjacent to The range of the included angle θ formed by the two surfaces of is 30 degrees to 90 degrees, and the optimal range of the included angle θ in this embodiment is 60 degrees.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. a kind of inner hole of workpiece fixer for machining, it is characterised in that the fixing device includes base, locating piece, fixture, institute State locating piece to be connected with the base, the fixture is arranged on the base and is connected with the base, the locating piece is used To determine the position of the fixture, the fixture is used to clamp the workpiece for needing to carry out interior hole machined.

2. inner hole of workpiece fixer for machining according to claim 1, it is characterised in that the fixing device includes three altogether Part-structure, the three part-structures size and shape are identical, and three part-structure is set around a center of circle, jointly Realize the fixation of the workpiece.

3. inner hole of workpiece fixer for machining according to claim 2, it is characterised in that the fixture is lived with the base Dynamic connection, the relatively described base left rotation and right rotation of the fixture or moves up and down.

4. inner hole of workpiece fixer for machining according to claim 3, it is characterised in that on the fixture and the base It is respectively provided with pin hole, straight pin is placed in the pin hole, is used to connect the fixture and the base and realizes the fixture With the relative motion between the base.

5. inner hole of workpiece fixer for machining according to claim 2, it is characterised in that the fixture inner side is designed as circle Arc structure, and the fixture inner side of three part-structure collectively constitutes a circle configurations.

6. inner hole of workpiece fixer for machining according to claim 2, it is characterised in that fixture inner side middle setting Circular groove.

7. inner hole of workpiece fixer for machining according to claim 6, it is characterised in that the fixture inner side is in described recessed Groove both sides set multiple raised structures, are used to clamp the workpiece.

8. inner hole of workpiece fixer for machining according to claim 7, it is characterised in that the raised structures are according to multiple rows of The shape proper alignment of multiple row.

9. inner hole of workpiece fixer for machining according to claim 8, it is characterised in that the raised structures are taper knot Structure, the pyramidal structure sharp end is towards the center of circle.

10. inner hole of workpiece fixer for machining according to claim 9, it is characterised in that the adjacent conical structure is faced Near two sides angle scope is 30 degree~90 degree.