Self-centering anti-deformation pneumatic clamp and machining equipment

Abstract

The utility model relates to a self-centering anti-deformation pneumatic clamp and machining equipment. The self-centering anti-deformation pneumatic clamp comprises a base, a centering piece and a pressing assembly. The centering piece is arranged on the base and comprises a mandrel, two supporting ribs are symmetrically arranged on the side face of the mandrel, and a ball plunger located between the two supporting ribs is further vertically arranged on the side face of the mandrel; the pressing assembly comprises a plurality of driving sources which surround the mandrel and are connected to the base, and output shafts of the driving sources are connected with pressing blocks. According to the self-centering anti-deformation pneumatic clamp, the ball plungers are arranged to be matched with the two supporting ribs in a three-point mode, the workpiece can be positioned and preliminarily fixed in an inner hole of the workpiece, and then the pressing blocks are driven by the multiple driving sources to axially press the positioned workpiece. It is guaranteed that the workpiece has enough stability, meanwhile, the situation that the workpiece is crushed and deformed is avoided, and the final size precision and quality of a product can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a self-centering anti-deformation pneumatic fixture and a machining device. Background Art

[0002] Machining refers to the process of changing the shape, size or performance of a workpiece through mechanical equipment. This process includes cutting machining and pressure processing, and is widely used in the fields of machinery, aerospace, automotive, electronics, etc.; the main purpose of machining is to precisely process raw materials according to the requirements of the design drawing to manufacture parts or products that meet the specifications.

[0003] In machining production, there is often a process of machining the outer surface of a workpiece with a center hole. The existing method for clamping and fixing such workpieces is to use an expansion mandrel to center and fix the workpiece. However, it is found in the actual machining process that the expansion force of the mandrel is difficult to control. When the expansion force of the mandrel is too large, it is easy to damage the product, and when the expansion force of the mandrel is insufficient, the product cannot be stably fixed, and the final machining accuracy of the product cannot be ensured. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that when centering and fixing a workpiece with an expansion mandrel, the expansion force of the mandrel is difficult to control. When the expansion force of the mandrel is too large, it is easy to damage the product, and when the expansion force of the mandrel is insufficient, the product cannot be stably fixed, and the final machining accuracy of the product cannot be ensured.

[0005] To solve the above technical problem, the utility model provides a self-centering anti-deformation pneumatic fixture, including:

[0006] A base;

[0007] A centering member, the centering member is arranged on the base, the centering member includes a mandrel, two support ribs extending along its length direction are symmetrically arranged on the side surface of the mandrel, and a ball plunger perpendicular to the side surface of the mandrel and located between the two support ribs is further arranged.

[0008] A pressing assembly, the pressing assembly includes a plurality of drive sources connected to the base around the mandrel, and the output shafts of the drive sources are all parallel to the mandrel and are connected with pressing blocks.

[0009] In an embodiment of the utility model, the base includes a base plate, a cylindrical base column is vertically arranged on the base plate, the centering member includes a frustum-shaped base, the base is coaxially connected to the base column, and the mandrel is coaxially arranged at the free end of the base.

[0010] In an embodiment of the present utility model, a limiting protrusion located on one side of the mandrel is provided at the free end of the base.

[0011] In an embodiment of the present utility model, three sets of pressing components are provided. The driving sources of the three sets of pressing components are all vertically connected to the substrate and arranged in a triangle. Mounting seats are provided on the shells of the driving sources. The middle position of the pressing block is rotatably connected to the mounting seat, one end of the pressing block is close to the centering member, and the other end is rotatably connected to the output shaft of the driving source.

[0012] In an embodiment of the present utility model, two symmetrically arranged connecting plates are symmetrically provided on the mounting seat, and the middle position of the pressing block is rotatably connected between the two connecting plates.

[0013] In an embodiment of the present utility model, the pressing block includes a main body portion. The middle position of the main body portion is rotatably connected to the mounting seat, one end of the main body portion is rotatably connected to the output shaft of the driving source, and the other end is provided with a pressing head.

[0014] In an embodiment of the present utility model, the ball head plunger and the two support ribs are arranged in a triangle.

[0015] In an embodiment of the present utility model, a chamfer is provided at the free end of the mandrel.

[0016] In an embodiment of the present utility model, the driving source is a cylinder.

[0017] A processing device includes the self-centering and anti-deformation pneumatic fixture as described in any one of the above.

[0018] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0019] A self-centering and anti-deformation pneumatic fixture and a processing device of the present utility model include a base, a centering member and a pressing component; the centering member is arranged on the base, the centering member includes a mandrel, two support ribs extending along its length direction are symmetrically arranged on the side surface of the mandrel, and a ball head plunger perpendicular to the side surface of the mandrel and located between the two support ribs is further provided; the pressing component includes a plurality of driving sources connected to the base around the mandrel, and the output shafts of the driving sources are all parallel to the mandrel and connected with pressing blocks. The self-centering and anti-deformation pneumatic fixture of the present utility model can realize positioning and preliminary fixing of the workpiece in the inner hole of the workpiece by setting the three-point cooperation of the ball head plunger and the two support ribs, and then drive the pressing blocks to axially press the positioned workpiece through a plurality of driving sources, ensuring that the workpiece has sufficient stability and at the same time preventing the workpiece from being damaged or deformed, and can guarantee the final dimensional accuracy and quality of the product; the structure of the whole fixture is simple, the installation and maintenance are convenient, and it is suitable for practical use. Brief Description of the Drawings

[0020] To make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments of the present utility model in combination with the accompanying drawings, wherein

[0021] Figure 1 is a schematic diagram when the self-centering and deformation-preventing pneumatic fixture of the preferred embodiment of the present utility model fixes a workpiece;

[0022] Figure 2 is a perspective view of the self-centering and deformation-preventing pneumatic fixture of the preferred embodiment of the present utility model;

[0023] Figure 3 is a schematic structural diagram of the centering member of the self-centering and deformation-preventing pneumatic fixture of the preferred embodiment of the present utility model;

[0024] Figure 4 is a top view of the centering member of the self-centering and deformation-preventing pneumatic fixture of the preferred embodiment of the present utility model;

[0025] Figure 5 is a schematic structural diagram of the pressing assembly of the self-centering and deformation-preventing pneumatic fixture of the preferred embodiment of the present utility model.

[0026] Description of the reference numerals in the drawings: 1. Base; 2. Centering member; 21. Mandrel; 22. Support rib; 23. Ball head plunger; 24. Limit protrusion; 3. Pressing assembly; 31. Driving source; 32. Pressure block; 33. Mounting seat; 34. Connecting plate. Detailed Embodiment

[0027] The following further describes the present utility model in combination with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments given are not intended to limit the present utility model.

[0028] Referring to Figures 1 - 5 as shown, a self-centering and deformation-preventing pneumatic fixture of the present utility model includes

[0029] a base 1;

[0030] a centering member 2, the centering member 2 is arranged on the base 1, the centering member 2 includes a mandrel 21, two support ribs 22 extending along its length direction are symmetrically arranged on the side surface of the mandrel 21, and a ball head plunger 23 located between the two support ribs 22 is also vertically arranged on the side surface of the mandrel 21;

[0031] a pressing assembly 3, the pressing assembly 3 includes a plurality of driving sources 31 connected to the base 1 around the mandrel 21, and the output shafts of the driving sources 31 are all parallel to the mandrel 21 and are connected with pressure blocks 32.

[0032] Specifically, the two support ribs 22 and the ball-head plunger 23 are arranged at triangular intervals on the side of the mandrel 21. The three points where the two support ribs 22 and the ball-head plunger 23 are located can form a circle, so that centering and positioning of the workpiece can be achieved in the inner hole of the workpiece. The pressing assembly 3 can press and fix the positioned workpiece by driving the pressing block 32 through the driving source 31. It can be conceived that the fixing method of the original expansion mandrel mainly fixes the workpiece by applying a radial force to the workpiece in the inner hole of the workpiece; while this fixture only applies a very small radial force to the workpiece, and mainly fixes the workpiece by applying an axial force to the workpiece through the pressing assembly 3. Since the workpiece is not easily deformed axially, the pressing assembly 3 can apply sufficient force to fix the workpiece, ensuring the stability of the workpiece during the machining process and thus guaranteeing the machining accuracy.

[0033] The self-centering and anti-deformation pneumatic fixture of the present utility model can achieve positioning and preliminary fixing of the workpiece in the inner hole of the workpiece by the three-point cooperation of the ball-head plunger 23 and the two support ribs 22, and then axially press the positioned workpiece by driving the pressing block 32 through multiple driving sources 31, ensuring that the workpiece has sufficient stability without the occurrence of the workpiece being bruised or deformed, and can guarantee the final dimensional accuracy and quality of the product. The structure of the whole fixture is simple, and the installation and maintenance are convenient, which is suitable for practical use.

[0034] Refer to Figure 1 、 Figure 2 and Figure 3 As shown in, further, the base 1 includes a base plate, and a cylindrical base column is vertically arranged on the base plate. The centering member 2 includes a frustum-shaped base, and the base is coaxially connected to the base column, and the free end of the base is coaxially provided with a mandrel 21. Specifically, the frustum-shaped base can make room for the pressing block 32, so that the pressing block 32 will not interfere during the movement process, ensuring the smooth progress of production.

[0035] Further, a limiting protrusion 24 is arranged at the free end of the base on one side of the mandrel. Specifically, the bottom of the workpiece has a notch matching the limiting protrusion 24. When sleeving the workpiece on the mandrel 21, making the positions of the notch and the limiting protrusion 24 correspond to each other can ensure the consistency during the feeding of the product. In this way, the product can be mass-produced by adjusting the processing equipment once, which can effectively improve the production efficiency and reduce the production cost.

[0036] Refer to Figure 5As shown, further, there are three sets of pressing components 3. The drive sources 31 of the three sets of pressing components 3 are all vertically connected to the substrate and arranged in a triangle. Mounting seats 33 are provided on the shells of the drive sources 31. The middle position of the pressing block 32 is rotatably connected to the mounting seat 33. One end of the pressing block 32 is close to the centering member 2, and the other end is rotatably connected to the output shaft of the drive source 31. Specifically, when the output shaft of the drive source 31 extends, the end of the pressing block 32 close to the mandrel 21 flips towards the side pressing the mandrel 21, so as to press and fix the workpiece sleeved on the mandrel 21; when the output end of the drive source 31 contracts, the end of the pressing block 32 close to the mandrel 21 flips towards the side away from the mandrel 21, so as to release the workpiece.

[0037] Further, two symmetric connecting plates 34 are symmetrically arranged on the mounting seat 33. The middle position of the pressing block 32 is rotatably connected between the two connecting plates 34. Specifically, the connecting plates 34 can be installed on the mounting seat 33 through bolts and nuts. At the same time, the pressing block 32 can also be rotatably connected between the two connecting plates 34 through bolts and nuts, which is convenient for installation and disassembly.

[0038] Further, the pressing block 32 includes a main body part. The middle position of the main body part is rotatably connected to the mounting seat, and one end of the main body part is rotatably connected to the output shaft of the drive source 31, and the other end is provided with a pressing head. The size and shape of the pressing head can be set according to the size and shape of the position where the workpiece is to be pressed to ensure the pressing effect.

[0039] Referring to Figure 3 and Figure 4 As shown, further, the ball head plunger 23 and the two support ribs 22 are arranged in a triangle, which is beneficial to the stability of the workpiece. The ball head plunger 23 can be a spring ball head plunger.

[0040] Further, a chamfer is provided at the free end of the mandrel 21. The chamfer can play a guiding role and facilitate the workpiece to be sleeved on the mandrel 21.

[0041] Further, the drive source 31 is a cylinder, but is not limited to a cylinder.

[0042] Embodiment 2

[0043] The present utility model also discloses a processing device, including the self-centering anti-deformation pneumatic fixture as in Embodiment 1.

[0044] Obviously, the above embodiments are only examples clearly described and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A self-centering and anti-deformation pneumatic fixture, characterized in that Comprising: Base; Centering member, the centering member is disposed on the base, the centering member includes a mandrel, two support ribs extending along its length direction are symmetrically disposed on the side surface of the mandrel, and a ball plunger located between the two support ribs is further vertically disposed on the side surface of the mandrel; Pressing assembly, the pressing assembly includes a plurality of drive sources connected to the base around the mandrel, and the output shafts of the drive sources are all parallel to the mandrel and are connected with pressing blocks.

2. The self-centering anti-deformation pneumatic fixture according to claim 1, characterized in that: The base includes a base plate, a cylindrical base column is vertically disposed on the base plate, the centering member includes a frustum-shaped base, the base is coaxially connected to the base column, and the mandrel is coaxially disposed at the free end of the base.

3. The self-centering anti-deformation pneumatic fixture according to claim 2, wherein: A limit protrusion located on one side of the mandrel is disposed at the free end of the base.

4. The self-centering anti-deformation pneumatic fixture according to claim 2, wherein: Three groups of the pressing assemblies are provided, the drive sources of the three groups of the pressing assemblies are all vertically connected to the base plate and are arranged in a triangle, mounting seats are disposed on the shells of the drive sources, the middle position of the pressing block is rotatably connected to the mounting seat, one end of the pressing block is close to the centering member, and the other end is rotatably connected to the output shaft of the drive source.

5. The self-centering anti-deformation pneumatic fixture according to claim 4, wherein: Two symmetrically arranged connecting plates are symmetrically disposed on the mounting seat, and the middle position of the pressing block is rotatably connected between the two connecting plates.

6. The self-centering anti-deformation pneumatic fixture according to claim 4, characterized in that: The pressing block includes a main body portion, the middle position of the main body portion is rotatably connected to the mounting seat, one end of the main body portion is rotatably connected to the output shaft of the drive source, and a pressing head is disposed at the other end.

7. The self-centering anti-deformation pneumatic fixture according to claim 1, characterized in that: The ball plunger and the two support ribs are arranged in a triangle.

8. The self-centering anti-deformation pneumatic fixture according to claim 1, characterized in that: A chamfer is disposed at the free end of the mandrel.

9. The self-centering anti-deformation pneumatic fixture according to claim 1, characterized in that: The drive source is a cylinder.

10. A processing device, characterized in that: Including the self-centering anti-deformation pneumatic fixture according to any one of claims 1-9.

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