Thin-wall structural part clamping device

Abstract

The invention provides a thin-wall structural part clamping device which comprises a base, a mandrel and ejector rods. One end of the base is a part fixed to a fixing device, the other end of the base is of a step structure, a hole is formed in the end face of the base, the base is installed and fixed in the hole, n through hole structures are arranged on the circumference of the side face of the base, the ejector rods are installed in the through hole structures, the upper surfaces of the upper parts of the ejector rods are molded surfaces matched with a structure to be clamped, the end faces of the lower parts of the ejector rods are arranged to be conical surfaces, the mandrel is matched with a mandrel installation hole in the base in shape, n wedge-shaped groove structures are arranged on the mandrel in the circumferential direction, and wedge-shaped surfaces of the wedge-shaped groove structures are matched with the conical surfaces of the lower parts of the ejector rods to form wedge structures. According to the thin-wall structural part clamping device provided by the invention, the technical problems that in the prior art, when a thin-wall structural part is machined, axial and radial stable supporting is lacked, the thin-wall part deforms in the machining process, and stable machining cannot be achieved are solved.

Description

technical field [0001] The invention belongs to the technical field of precision machining, and in particular relates to a clamping device for thin-walled structural parts. Background technique [0002] In the field of mechanical processing, parts must be installed in the fixture before processing to obtain a correct position and direction, and to ensure the correct position and direction even though they are affected by cutting forces and other external forces during processing. [0003] At present, the thin-walled circular structural parts are difficult to position and clamp because of their thin walls, and the processing accuracy is not easy to guarantee. In the process of precision machining, threaded tires are usually made. With the tightening of the tapered screws in the threaded tires, the outer cone structure of the tapered screws in the tires is displaced in a straight line, and the inner conical surface of the tires that cooperates with it is pushed in the circumfe...

AI Technical Summary

Problems solved by technology

[0003] At present, thin-walled circular structural parts are difficult to position and clamp because of their thin walls, and the machining accuracy is not easy to guarantee.

In the process of precision machining, threaded tires are usually made. With the tightening of the tapered screws in the threaded tires, the outer cone structure of the tapered screws in the tires is displaced in a straight line, and the inner conical surface of the tires that cooperates with it is pushed in the circumferential direction. The radial elastic deformation is used to clamp the thin-walled ring structure, but the clamping of the threaded tire is in line contact. During the processing, the inner peripheral side wall of the thin-walled ring structure is clamped along the axial direction of the part The force and cutting force are uneven. At the same time, the clamping force of the threaded tire is not easy to control. When clamping thin-walled circular structural parts, it is easy to clamp and deform, and the machining accuracy is not easy to guarantee.

[0004] In the patent CN208322742U, a kind of thin-walled pipe clamping tool is provided. The push rod in the tool has no limit in the circumferential direction of the fixed cylinder. During use, there is a possibility that the push rod rotates along the circumferential direction; The truncated cone structure on the push rod can offset the circular rotation of the push rod during the axial movement of the fixed cylinder to a certain extent, but it still cannot effectively control the linear movement of the push rod along the axial direction of the fixed cylinder. The circular rotation of the rod inside the tooling will affect the stability of the tooling; individual push rods may fall, and the pressing pin is not rotated and positioned along its own rotation axis, and it needs to be manually aligned during actual use. Auxiliary positioning; the pressing pins distributed along the circumference of the fixed cylinder will not automatically reset to the initial state, and manual assistance is required.

[0005] In the patent CN109128237A, the thin-walled cylinder is supported by three groups of elastic bodies through arc surface contact, and the outward supporting force of each elastic body in the radial direction is transmitted by two spring-supported connecting rods. In this system, the supporting force It comes from the rebound force generated by the spring contraction of the tightening spring of the adjusting nut on the connecting rod. However, the spring rebound force is an elastic force rather than a stable rigid support force. In the whole system, the thin-walled cylindrical parts are Contacted by three groups of elastic bodies, the supporting force comes from the elastic rebound force of the compressed spring. The thin-walled cylindrical part can be regarded as in an elastic suspension state in the radial direction, and there is no stable and rigid stable support. Its supporting clamping force Unable to support the radial cutting force on the system when the thin-walled cylinder is turned from the outside, it will inevitably cause machining chatter or the shape and position accuracy of the thin-walled cylinder is out of tolerance

Images