Clamping and positioning clamp for thin-wall cylinder part

Abstract

The utility model relates to a thin-walled cylinder piece clamping and positioning fixture, which comprises a clamping chuck, a pressing plate, an outer wall clamping cylinder and a crank cam pressing mechanism, the clamping chuck is connected with the outer wall clamping cylinder through a fastening screw, the pressing plate is connected with the clamping chuck through a pressing screw, and the crank cam pressing mechanism is connected with the outer wall clamping cylinder through a pressing screw. The bottom face of the thin-wall cylinder part is pressed on the surface of the clamping chuck through the pressing plate, and four crank cam pressing mechanisms are arranged at the large end of the outer wall clamping cylinder. The crank cam pressing mechanism comprises a crank rod, a pressing plate ring, a base, a shaft plate and a spring. The thin-walled cylinder part is clamped and positioned, when the inner circle of the part is machined, the part is fixed by clamping the outer edge of the tool, the clamping force can be prevented from being too large, and the ovality deformation of the part is reduced; a small-end spigot and a tool are used for positioning; a cam crank mechanism is used for clamping, so that clamping and dismounting are convenient; the inner wall is free of interference and is supported by the outer contour, and the number of times of tool changing in the machining process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thin-walled parts clamping, in particular to a thin-walled cylindrical parts clamping and positioning fixture. Background Art

[0002] The current mechanical processing technology field is booming. In the process of using CNC lathes to process cylindrical thin-walled parts, the cylindrical thin-walled parts must first be clamped and positioned. Thin-walled cylindrical parts are very easy to deform. As the ovality of the collar increases, the traditional clamping method can easily cause ovality deformation during processing due to excessive clamping force; it is not easy to clamp when the wall thickness exceeds the range specified in the drawing; after clamping using the traditional clamping method, there is a lot of interference when processing the inner wall of the workpiece, which is inconvenient to process. It is very inconvenient to load and unload the clamped workpiece during processing, which reduces production efficiency. Summary of the invention

[0003] The utility model aims to solve the deficiencies of the prior art and provides a clamping and positioning fixture for a thin-walled cylindrical piece.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A clamping and positioning fixture for thin-walled cylindrical parts, comprising: a clamping chuck, a pressure plate, an outer wall cartridge, and a crank cam clamping mechanism. The surface of the clamping chuck is provided with a chuck inner groove, the width of the chuck inner groove is set equal to the thickness of the bottom of the outer wall cartridge, the clamping chuck and the outer wall cartridge are connected by a fastening screw, the surface of the clamping chuck is provided with a positioning groove, the depth of the positioning groove is greater than the depth of the chuck inner groove, the outer diameter of the positioning groove is set equal to the outer diameter of the bottom surface of the thin-walled cylindrical part, the pressure plate is connected to the clamping chuck by a clamping screw, the pressure plate presses the bottom surface of the thin-walled cylindrical part to the surface of the clamping chuck, and the large end of the outer wall cartridge is provided with four crank cam clamping mechanisms.

[0006] The crank cam clamping mechanism includes a crank rod, a pressure plate ring, a base, an axis plate and a spring; the base is fixedly connected to the large end of the outer wall cartridge, the axis plate is fixedly connected to the base, the pressure plate ring is rotatably connected to the axis plate at a position close to the inner side of the cylinder wall, the crank rod is rotatably connected to the axis plate at a position close to the outer side of the cylinder wall, the crank rod abuts against the pressure plate ring, one end of the pressure plate ring close to the base is connected to the spring, and the other end of the spring is fixedly connected to the base.

[0007] A buckle is fixedly connected to the crank rod.

[0008] The beneficial effects of the utility model are as follows: the utility model clamps and positions thin-walled cylindrical parts. When processing the inner circle of the part, the part is fixed by clamping the outer edge of the tooling, which can prevent the clamping force from being too large and reduce the ovality deformation of the part; a small end stop and tooling positioning are adopted; a cam crank mechanism is used for clamping, which is convenient for clamping and disassembly; there is no interference with the inner wall, and it is entirely supported by the external contour, which reduces the number of tool changes during the processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 is a schematic diagram of the structure of the clamping chuck;

[0011] Figure 3 is a side view of the clamping chuck;

[0012] Figure 4 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0013] In the figure: 1-clamping chuck; 10-chuck inner groove; 11-positioning groove; 2-pressing plate; 3-outer wall cartridge; 4-crank cam clamping mechanism; 40-crank rod; 41-pressing plate ring; 42-base; 43-shaft plate; 44-spring; 45-buckle; 5-fastening screw; 6-pressing screw;

[0014] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0016] like Figure 1 to Figure 3 As shown, a thin-walled cylindrical part clamping and positioning fixture comprises: a clamping chuck 1, a pressure plate 2, an outer wall cartridge 3, and a crank cam clamping mechanism 4. The surface of the clamping chuck 1 is provided with a chuck inner groove 10, and the width of the chuck inner groove 10 is set equal to the thickness of the bottom of the outer wall cartridge 3. The clamping chuck 1 and the outer wall cartridge 3 are connected by a fastening screw 5. The surface of the clamping chuck 1 is provided with a positioning groove 11, and the depth of the positioning groove 11 is greater than the depth of the chuck inner groove 10. The outer diameter of the positioning groove 11 is set equal to the outer diameter of the bottom surface of the thin-walled cylindrical part. The pressure plate 2 and the clamping chuck 1 are connected by a clamping screw 6. The pressure plate 2 presses the bottom surface of the thin-walled cylindrical part against the surface of the clamping chuck 1, and the large end of the outer wall cartridge 3 is provided with four crank cam clamping mechanisms 4. The clamping chuck 1, the pressure plate 2 and the outer wall cartridge 3 cooperate to clamp and position the bottom surface of the thin-walled cylindrical part, and the crank cam clamping mechanism 4 and the outer wall cartridge 3 cooperate to fix the top edge of the thin-walled cylindrical part.

[0017] like Figure 4 As shown, the crank cam clamping mechanism 4 includes a crank rod 40, a pressure plate ring 41, a base 42, a shaft plate 43 and a spring 44; the base 42 is fixedly connected to the large end of the outer wall cartridge 3, the shaft plate 43 is fixedly connected to the base 42, the pressure plate ring 41 is rotatably connected to the shaft plate 43 at a position close to the inner side of the cylinder wall, the crank rod 40 is rotatably connected to the shaft plate 43 at a position close to the outer side of the cylinder wall, the crank rod 40 is in contact with the pressure plate ring 41, one end of the pressure plate ring 41 close to the base 42 is connected to the spring 44, and the other end of the spring 44 is fixedly connected to the base 42. When the crank rod 40 is rotated toward the outside of the workpiece, the crank rod 40 pushes the pressure plate ring 41 to rotate, the pressure plate ring 41 pulls the spring 44 to be taut and stressed, and the pressure plate ring 41 touches the part and presses it; when the crank rod 40 is rotated toward the outside of the workpiece, the spring 44 automatically rebounds, driving the pressure plate ring 41 back to its original position, releasing the clamping of the part.

[0018] A buckle 45 is fixedly connected to the crank rod 40. The crank rod 40 is rotated by pulling the buckle 45.

[0019] When the utility model is used: align the outer wall cartridge 3 with the inner groove 10 of the cartridge to position it, connect the clamping cartridge 1 with the outer wall cartridge 3 through the fastening screw 5, put the part into the tooling, then align the pressure plate 2 with the positioning groove 11 reserved on the clamping cartridge 1, and use the clamping screw 6 to connect and fasten the pressure plate 2 with the clamping cartridge 1 to press the bottom of the part. Then, pull the buckle 45 of the four crank cam clamping mechanisms 4 at the large end of the tooling toward the outside of the tooling, the buckle drives the crank rod 40 to rotate, the crank rod 40 pushes the pressure plate ring 41 to rotate, the pressure plate ring 41 pulls the spring 44 to be taut, and the pressure plate ring 41 touches the part and presses it; to remove the part, you only need to pull the buckle 45, turn the crank rod 40 toward the outside of the workpiece, the spring 44 automatically rebounds, drives the pressure plate ring 41 back to its original position, and releases the pressure on the part.

[0020] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A thin-walled cylindrical part clamping and positioning fixture, characterized in that: include: A clamping chuck (1), a pressure plate (2), an outer wall cartridge (3), and a crank cam clamping mechanism (4); the surface of the clamping chuck (1) is provided with a chuck inner groove (10); the width of the chuck inner groove (10) is set equal to the thickness of the bottom of the outer wall cartridge (3); the clamping chuck (1) and the outer wall cartridge (3) are connected by a fastening screw (5); the surface of the clamping chuck (1) is provided with a positioning groove (11); the depth of the positioning groove (11) is greater than the depth of the chuck inner groove (10); the outer diameter of the positioning groove (11) is set equal to the outer diameter of the bottom surface of the thin-walled cylindrical part; the pressure plate (2) and the clamping chuck (1) are connected by a clamping screw (6); the pressure plate (2) presses the bottom surface of the thin-walled cylindrical part against the surface of the clamping chuck (1); and four crank cam clamping mechanisms (4) are provided at the large end of the outer wall cartridge (3).

2. A thin-walled cylindrical part clamping and positioning fixture according to claim 1, characterized in that: The crank cam clamping mechanism (4) comprises a crank rod (40), a pressure plate ring (41), a base (42), an axis plate (43) and a spring (44); the base (42) is fixedly connected to the large end of the outer wall clamp (3), the axis plate (43) is fixedly connected to the base (42), the pressure plate ring (41) is rotatably connected to the axis plate (43) at a position close to the inner side of the cylinder wall, the crank rod (40) is rotatably connected to the axis plate (43) at a position close to the outer side of the cylinder wall, the crank rod (40) is in contact with the pressure plate ring (41), one end of the pressure plate ring (41) close to the base (42) is connected to the spring (44), and the other end of the spring (44) is fixedly connected to the base (42).

3. A thin-walled cylindrical part clamping and positioning fixture according to claim 2, characterized in that: A buckle (45) is fixedly connected to the crank rod (40).

Images