Self-centering fixture

Abstract

The invention discloses a self-centering fixture which comprises a mandrel and an expansion sleeve, wherein the mandrel is mounted on a machine tool through a flange; the expansion sleeve is sleeved on the outer circumference of the mandrel and can move axially; multiple expansion joints are arranged on the outer wall of the expansion sleeve; the outer wall of the mandrel and the inner wall of the expansion sleeve are matched conical surfaces; the mandrel is provided with an adjusting nut for driving the expansion sleeve to move along the mandrel; a pull rod and a stop ring are arranged between the mandrel and the expansion sleeve to pull the expanded sleeve to a shrinkage end; and through the expansion and shrinkage of the expansion joints, the outer diameter is controlled to increase / reduce so as to position / dismantle a workpiece. The fixture has a simple structure, is convenient to use and can realize self centering; and moreover, the processing accuracy of the workpiece is improved, the concentricity and verticality between the processed surface and an inner hole of the workpiece can be ensured, and the fixture deserves popularization and application in the fields realizing positioning and clamping by use of the inner hole of the workpiece.

Description

technical field [0001] The present invention relates to a workpiece fixture, in particular, to a self-centering fixture. Background technique [0002] In mechanical processing, some workpieces are positioned and clamped through their inner holes, but the existing fixtures are either complex in structure, or cumbersome to unload, and most of them cannot achieve self-centering, and often cannot meet the requirements of the conditions , resulting in poor machining accuracy. Contents of the invention [0003] It is an object of the present invention to provide a clamp that is capable of self-centering. [0004] In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions: [0005] A self-centering fixture, comprising a mandrel mounted on a machine tool through a flange, an expansion sleeve sleeved on the outer periphery of the mandrel and able to move axially, [0006] The mandrel is a hollow cone, and th...

AI Technical Summary

Problems solved by technology

[0002]In mechanical processing, some workpieces are positioned and clamped through their inner holes, and the existing fixtures are either complicated in structure or cumbersome to unload. And most of them cannot realize self-centering, and often cannot meet the requirements of the conditions, resulting in poor machining accuracy

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