Pneumatic quick clamping milling machine fixture

Abstract

The invention discloses a pneumatic rapid clamping milling machine fixture which comprises a fixture base, an outer circle adjustable pressing block assembly and a middle air cylinder assembly, the middle air cylinder assembly is arranged in the middle of the fixture base, and the outer circle adjustable pressing block assembly is arranged on the periphery of the middle air cylinder assembly; the middle air cylinder assembly comprises a pressing plate, an air cylinder top sealing plate, an air cylinder bottom face sealing plate and an air cylinder telescopic shaft. The outer circle adjustable pressing block assembly comprises a position adjusting air cylinder, a guide rail and a rotating air cylinder. In the using process, quick replacement can be achieved according to products, the clamp body does not need to be disassembled, and the time for reinstalling the alignment clamp when the products are replaced is shortened; the outer circle adjustable pressing block assembly can adjust the clamping position and the clamping force according to the product structure and the material. And clamping deformation of the workpiece is avoided while clamping is guaranteed. Aiming at the characteristics of multi-batch, multi-variety and small-batch aviation products, one fixture can process multiple products, so that the waiting time of a machine tool is shortened, and the production organization difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing spare parts for aero-engines, and particularly to a pneumatic quick-clamping milling fixture. Background Art

[0002] In mechanical engineering, fixture design and application is an important field. A fixture is a device used to fix and position workpieces, which is widely used in the manufacturing process. Common types include mechanical fixtures, hydraulic fixtures, pneumatic fixtures, electromagnetic fixtures, etc. Currently, when designing fixtures, mechanical fixture structures are mostly adopted, which are mostly positioning pins, spigot positioning, and single or multiple bolt clamping structures. In practical applications, such tooling solutions have problems such as long clamping time, long waiting time of the machine tool, inconsistent clamping force, high fixture cost, and complex production organization.

[0003] In the process of manufacturing spare parts for aero-engines, due to the similar working principles of different models of the whole machine and the similar functions of each component, there are a large number of products with similar structures and close outer contour dimensions, such as bushings, cylindrical pins, bearing bushings, clamps, etc. The batch size of such products in a single batch is large, the machining time of a single piece on the machine tool is short, and the operator needs to repeatedly complete the workpiece clamping work, resulting in high labor intensity and low production efficiency of the products. At the same time, for manual clamping, it is not easy to control the clamping force consistently, and there is a risk of workpiece clamping deformation. At the same time, when preparing the processing technology, designing processing tooling for each different processing procedure according to the drawing number will cause a large amount of repetitive work, not only increasing the production cost of the product, but also increasing the complexity of production preparation and production management. Summary of the Invention

[0004] The purpose of the present invention is to provide a pneumatic quick-clamping milling fixture to solve the technical problem of reduced efficiency caused by manual or inconvenient clamping in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A pneumatic quick-clamping milling fixture provided by the present invention includes a fixture base, an outer circle adjustable pressure block assembly, and an intermediate cylinder assembly. The intermediate cylinder assembly is arranged in the middle of the fixture base, and the outer circle adjustable pressure block assembly is arranged around the intermediate cylinder assembly. The intermediate cylinder assembly includes a pressure plate, a cylinder top sealing plate, a cylinder bottom sealing plate, and a cylinder telescopic shaft. The outer circle adjustable pressure block assembly includes a position adjusting cylinder, a guide rail, and a rotating cylinder.

[0006] Further, there are 4 outer circle adjustable pressure block assemblies, which are fixed on the fixture base through bolts at the bottom. By adjusting the extension length of the position adjusting cylinder, it can adapt to workpieces of different sizes. After the clamping position is determined, the workpiece can be clamped by the rotating cylinder.

[0007] Further, a workpiece cushion block is also provided on the cylinder sealing top plate, and the part is fixed on the workpiece cushion block through the central hole of the part. Press plates of different sizes can be selected according to the size of the machined part.

[0008] Further, it also includes a manual control valve, and the manual control valve is connected to the cylinders in the intermediate cylinder assembly and the outer circle adjustable pressure block assembly through pipelines.

[0009] Further, the manual control valve is divided into a three - gear manual control valve and a two - gear manual control valve. The three - gear manual control valve can control the forward movement, backward movement and position holding of the position - adjusting cylinder to adapt to the clamping points of machined workpieces of different sizes.

[0010] Further, the two - gear manual control valve respectively controls the rotary cylinders in the intermediate cylinder assembly and the outer circle adjustable pressure block assembly to clamp the machined workpiece.

[0011] Further, it also includes a precision pressure regulating valve. The precision pressure regulating valve is connected to a pressure gauge, and the precision pressure regulating valve precisely controls the intake air pressure of the cylinder to control the pressure of the cylinder for clamping the workpiece.

[0012] Further, the external dimensions of the pneumatic quick - clamping milling fixture are: length, width, height ≤ 400×400×300 mm, and the pneumatic quick - clamping milling fixture is compatible with regular parts within the dimensions of length and width of 60 - 200 or circular parts with a diameter within 200 mm.

[0013] Furthermore, the pneumatic quick - clamping milling fixture performs the following operations: 1) The operator places the workpiece on the workpiece cushion block in the middle of the fixture. If there is no hole in the middle of the machined part, the press plate on the intermediate cylinder needs to be removed first, and the cylinder is retracted to the bottom; 2) Adjust the three - gear manual valve to make the pressing points of the four rotary clamping cylinders adapt to the size of the workpiece. Control the corresponding two - gear manual valve to make the rotary cylinder clamp the workpiece; 3) Rotate the precision pressure regulating valve of the corresponding rotary cylinder. According to the display of the pressure gauge, adjust the air pressure of the cylinder to control the pressure of the cylinder on the part; 4) If there is a middle hole in the machined part, quick - mounting press plates of different sizes can be selected according to the size of the hole.

[0014] Based on the above - mentioned technical solutions, the embodiments of the present invention can at least produce the following technical effects: (1)The pneumatic quick-clamping milling fixture provided by the present invention can be quickly replaced according to the product during use without disassembling the fixture body, reducing the time for reinstalling and aligning the fixture when replacing the product; the outer circle adjustable pressure block assembly can adjust the clamping position and clamping force according to the product structure and material, ensuring clamping while avoiding clamping deformation of the workpiece. The purpose of the present invention is to make a fixture suitable for processing multiple products in view of the characteristics of multiple batches, multiple varieties, and small batches of aviation products, thereby reducing the waiting time of the machine tool and reducing the difficulty of production organization.

[0015] (2)Compared with the conventional mechanical positioning and clamping method, the pneumatic quick-clamping milling fixture provided by the present invention has the advantages of convenient use, high clamping efficiency, short waiting time of the machine tool, and strong adaptability to multiple products. Thus, the processing efficiency is effectively improved and the production management difficulty is reduced. The milling fixture of the present invention uses compressed air as the power source, and compared with other methods such as electromagnetic, the modification of the existing equipment is minimized, reducing the transformation cost of production facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 is the structural schematic diagram of the embodiment of the present invention; Figure 2 is the structural schematic diagram of the outer circle adjustable pressure block assembly of the embodiment of the present invention; Figure 3 is the structural schematic diagram of the intermediate cylinder assembly of the embodiment of the present invention; Figure 4 is the structural schematic diagram of the precision pressure regulating valve of the embodiment of the present invention; Figure 5 is the structural schematic diagram of the manual control valve of the embodiment of the present invention; Figure 6 is the structural schematic diagram of the fixture base removed in the embodiment of the present invention; In the figure: 1. Fixture base; 2. Intermediate cylinder assembly; 21. Pressure plate; 22. Cylinder top sealing plate; 23. Cylinder bottom sealing plate; 24. Cylinder telescopic shaft; 25. Workpiece cushion block; 26. Workpiece; 3. Outer circle adjustable pressure block assembly; 31. Position adjustment cylinder; 32. Rotary cylinder; 33. Guide rail; 4. Three-position manual control valve; 5. Two-position manual control valve; 6. Precision pressure regulating valve; 7. Pressure gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0019] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. The terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0020] In the present invention, the position adjustment cylinder, the rotary cylinder, the three-position manual control valve, the two-position manual control valve, and the precision pressure regulating valve all adopt products of AirTAC brand, and the model can be selected according to the pressure required by the workpiece.

[0021] Embodiment 1 The present invention provides a pneumatic quick-clamping milling fixture, which includes a fixture base 1, an outer circle adjustable pressure block assembly 3, and an intermediate cylinder assembly 2. The intermediate cylinder assembly 2 is arranged in the middle of the fixture base 1, and the outer circle adjustable pressure block assembly 3 is arranged around the intermediate cylinder assembly 2. The intermediate cylinder assembly 2 includes a pressing plate 22, a cylinder top sealing plate 23, a cylinder bottom sealing plate 24, and a cylinder telescopic shaft 25. The outer circle adjustable pressure block assembly 3 includes a position adjustment cylinder 31, a guide rail 33, and a rotary cylinder 32.

[0022] In this embodiment, there are 4 outer circle adjustable pressure block assemblies 3, which are fixed on the fixture base 1 through bolts at the bottom. By adjusting the extension length of the position adjustment cylinder 31, it can adapt to workpieces of different sizes. After the clamping position is determined, the workpiece 26 can be pressed tightly by the rotary cylinder 32.

[0023] In this embodiment, a workpiece cushion block 25 is further provided on the cylinder sealing top plate 24. The workpiece 26 is fixed on the workpiece cushion block 25 through the central hole of the part, and pressure plates 22 of different sizes can be selected according to the size of the machined part.

[0024] In this embodiment, it further includes a manual control valve, and the manual control valve is connected to the cylinders in the intermediate cylinder assembly 2 and the outer circle adjustable pressure block assembly 3 through pipelines.

[0025] In this embodiment, the manual control valve is divided into a three - gear manual control valve 4 and a two - gear manual control valve 5. The three - gear manual control valve 4 can control the forward movement, backward movement and position holding of the position - adjusting cylinder 31 to adapt to the clamping points of workpieces of different sizes.

[0026] In this embodiment, the two - gear manual control valve 5 respectively controls the rotary cylinders in the intermediate cylinder assembly 2 and the outer circle adjustable pressure block assembly 3 to clamp the machined workpiece.

[0027] In this embodiment, it further includes a precision pressure regulating valve 6. The precision pressure regulating valve 6 is connected to a pressure gauge 7. The precision pressure regulating valve 6 precisely controls the intake air pressure of the cylinder to control the clamping pressure of the cylinder on the workpiece.

[0028] In this embodiment, the external dimensions of the pneumatic quick - clamping milling machine fixture are: length, width, height ≤ 400×400×300 mm. The pneumatic quick - clamping milling machine fixture is compatible with regular parts within the size range of length and width of 60 - 200 or circular parts with a diameter of less than 200 mm.

[0029] The pneumatic quick - clamping milling machine fixture performs the following operations: 1) The operator places the workpiece on the workpiece cushion block in the middle of the fixture. If there is no hole in the middle of the machined part, the pressure plate on the intermediate cylinder needs to be removed first, and the cylinder is retracted to the bottom. 2) Adjust the three - gear manual valve to make the pressing points of the four rotary clamping cylinders adapt to the size of the workpiece. Control the corresponding two - gear manual valve to make the rotary cylinder clamp the workpiece. 3) Rotate the precision pressure regulating valve of the corresponding rotary cylinder. According to the display of the pressure gauge, adjust the air pressure of the cylinder to control the pressure of the cylinder on the part. 4) If there is a middle hole in the machined part, quick - mounting pressure plates of different sizes can be selected according to the size of the hole.

[0030] In this embodiment, compressed air is used as the power source for fixture clamping, and the air source pressure ≥ 0.8 MP.

[0031] In this embodiment, the adjustable range of pressure is: 0 - 1500 N.

[0032] Embodiment 2 The present invention provides a pneumatic quick-clamping milling fixture, which includes a fixture base 1, an outer-circle adjustable pressure block assembly 3, and an intermediate cylinder assembly 2. The intermediate cylinder assembly 2 is arranged in the middle of the fixture base 1, and the outer-circle adjustable pressure block assembly 3 is arranged around the intermediate cylinder assembly 2. The intermediate cylinder assembly 2 includes a pressure plate 22, a cylinder top sealing plate 23, a cylinder bottom sealing plate 24, and a cylinder telescopic shaft 25. The outer-circle adjustable pressure block assembly 3 includes a position adjustment cylinder 31, a guide rail 33, and a rotary cylinder 32.

[0033] In this embodiment, there are 4 outer-circle adjustable pressure block assemblies 3, which are fixed on the fixture base 1 through bolts at the bottom. By adjusting the extending length of the position adjustment cylinder 31, it can adapt to workpieces of different sizes. After the clamping position is determined, the workpiece 26 can be clamped by the rotary cylinder 32.

[0034] In this embodiment, a workpiece cushion block 25 is further provided on the cylinder top sealing plate 24. The workpiece 26 is fixed on the workpiece cushion block 25 through the central hole of the part, and the diameter of the workpiece 26 is 200 mm.

[0035] In this embodiment, it further includes a manual control valve, and the manual control valve is connected to the cylinders in the intermediate cylinder assembly 2 and the outer-circle adjustable pressure block assembly 3 through pipelines.

[0036] In this embodiment, the manual control valve is divided into a three-gear manual control valve 4 and a two-gear manual control valve 5. The three-gear manual control valve 4 can control the forward movement, backward movement, and position holding of the position adjustment cylinder 31 to adapt to the clamping points of workpieces of different sizes.

[0037] In this embodiment, the two-gear manual control valve 5 respectively controls the rotary cylinders in the intermediate cylinder assembly 2 and the outer-circle adjustable pressure block assembly 3 to clamp the workpiece being processed.

[0038] In this embodiment, it further includes a precision pressure regulating valve 6. The precision pressure regulating valve 6 is connected to a pressure gauge 7, and the precision pressure regulating valve 6 precisely controls the intake air pressure of the cylinder to control the clamping pressure of the cylinder on the workpiece.

[0039] During the use process, the positioning device can be quickly replaced according to the product, and the fixture body does not need to be disassembled, reducing the time for reinstalling and aligning the fixture when replacing the product. The clamping device (outer-circle adjustable pressure block assembly) can adjust the clamping position and clamping force according to the product structure and material, ensuring clamping while avoiding clamping deformation of the workpiece. The purpose of the present invention is to make a fixture suitable for the processing of multiple products in view of the characteristics of multiple batches, multiple varieties, and small batches of aviation products, thereby reducing the waiting time of the machine tool and reducing the difficulty of production organization.

[0040] The structures, functions, and connection forms disclosed in this document can be implemented in other ways. For example, the embodiments described above are merely illustrative. For instance, multiple components can be combined or integrated into another component. Additionally, in each embodiment of this document, the various functional components can be integrated into one functional component, or each functional component can exist physically alone, or two or more functional components can be integrated into one functional component.

[0041] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention.

Claims

1. A pneumatic quick-clamping milling fixture, characterized in that, It includes a fixture base (1), an outer circle adjustable pressing block assembly (3) and an intermediate cylinder assembly (2). The intermediate cylinder assembly (2) is arranged in the middle of the fixture base (1), and the outer circle adjustable pressing block assembly (3) is arranged around the intermediate cylinder assembly (2). The intermediate cylinder assembly (2) includes a pressing plate (22), a cylinder top sealing plate (23), a cylinder bottom sealing plate (24) and a cylinder telescopic shaft (25). The outer circle adjustable pressing block assembly (3) includes a position adjusting cylinder (31), a guide rail (33) and a rotary cylinder (32).

2. The pneumatic quick-clamping milling fixture according to claim 1, characterized in that, There are 4 outer circle adjustable pressing block assemblies (3), which are fixed on the fixture base (1) through bolts at the bottom. By adjusting the extension length of the position adjusting cylinder (31), it can adapt to workpieces of different sizes. After the clamping position is determined, the workpiece (26) can be pressed by the rotary cylinder (32).

3. The pneumatic quick-clamping milling fixture according to claim 1, wherein A workpiece cushion block (25) is also arranged on the cylinder top sealing plate (24). The workpiece (26) is fixed on the workpiece cushion block (25) through the central hole of the part, and pressing plates (22) of different sizes can be selected according to the size of the machined part.

4. The pneumatic quick-clamping milling machine fixture according to claim 1, characterized in that, It also includes a manual control valve, and the manual control valve is connected to the cylinders in the intermediate cylinder assembly (2) and the outer circle adjustable pressing block assembly (3) through pipelines.

5. The pneumatic quick-clamping milling machine fixture according to claim 4, characterized in that, The manual control valve is divided into a three - gear manual control valve (4) and a two - gear manual control valve (5). The three - gear manual control valve (4) can control the forward movement, backward movement and position holding of the position adjusting cylinder (31) to adapt to the clamping points of workpieces of different sizes.

6. The pneumatic quick-clamping milling machine fixture according to claim 5, wherein The two - gear manual control valve (5) controls the rotary cylinders in the intermediate cylinder assembly (2) and the outer circle adjustable pressing block assembly (3) respectively to clamp the machined workpiece.

7. The pneumatic quick-clamping milling machine fixture according to claim 1, wherein It also includes a precision pressure regulating valve (6). The precision pressure regulating valve (6) is connected to a pressure gauge (7). The precision pressure regulating valve (6) precisely controls the intake air pressure of the cylinder to control the clamping pressure of the cylinder on the workpiece.

8. The pneumatic quick-clamping milling machine fixture according to claim 1, characterized in that, The external dimensions of the pneumatic quick - clamping milling machine fixture are: length, width, height ≤ 400×400×300 mm. The pneumatic quick - clamping milling machine fixture is compatible with regular parts within the size range of length and width of 60 - 200 or circular parts with a diameter of less than 200 mm.

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