Star ring type multi-perforated expansion clamping device

Abstract

The invention provides a star ring type multi-perforated expansion clamping device, comprising a V-shaped slot star ring base frame and round expansion assemblies; the round expansion assemblies are placed in the V-shaped slot star ring base frame being a slab; star rings formed by a plurality of V-shaped slots are arranged in the slab; the round expansion assemblies are inserted in the V-shaped slot star rings; the round expansion assemblies can be radially, uniformly and circumferentially expanded and bulged under the axial force action so as to radially clamp a thin wall hollow tubular part placed between the V-shaped slot star rings and the round expansion assemblies. The thin wall hollow tubular part is positioned by the radial expanding and bulging of two rubber rings and the V-shaped slot star rings, the clamping force is uniform, the perpendicularity of the thin wall hollow tubular part can be ensured and the deviation in positioning is avoided. The machining efficiency is improved, the grinding difficulty is reduced and the precision of the end surface of the small-diameter thin wall hollow tubular part is ensured.

Description

technical field [0001] The invention relates to a fixture, in particular to a quick clamping device for grinding the two end surfaces of a thin-walled hollow tube with small diameter and high precision. Background technique [0002] Thin-walled hollow tube parts are parts on launch vehicles, with a small outer diameter (Φ6.35㎜), a wall thickness of 0.75, high requirements for dimensional accuracy and geometric tolerance accuracy of both ends, and large quantities. In order to ensure the flatness and dimensional accuracy requirements of both ends, the existing tooling adopts the method of cylindrical hole positioning and bolt clamping for processing. The existing problem is: because it is difficult to ensure the consistency of the shape and dimension of the thin-walled hollow tube workpiece, it is easy to cause the mismatch between the cylindrical hole of the tooling and the outer circle of the thin-walled hollow tube workpiece, causing the gap between the two to be too large...

AI Technical Summary

Problems solved by technology

The existing problem is: because it is difficult to guarantee the consistency of the shape and size of the thin-walled hollow tube workpiece, it is easy to cause the mismatch between the cylindrical hole of the tooling and the outer circle of the thin-walled hollow tube workpiece, resulting in an excessive gap between the two, making the The thin-walled hollow tube workpiece is in a free positioning state; due to the excessive gap, the thin-walled hollow tube workpiece will move slightly under the action of external force, which is difficult to meet the requirements of flatness of 0.002 mm and verticality of 0.005 mm for thin-walled hollow tube workpiece ; At the same time, the existing tooling uses bolts to directly lock the thin-walled hollow tube workpiece, which is likely to cause damage to the surface of the part

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