Outward expansion mandrel with multiple support parts

Abstract

The invention provides an outward expansion mandrel with multiple support parts. The outward expansion mandrel comprises a mandrel body, wherein a first outward expansion part and a second outward expansion part of which the outer walls can expand outwards are arranged on the mandrel in the axial direction; two outward expanding support parts are arranged in the axial direction to support inner holes of workpieces in tandem in the axial direction, so that the workpieces can be positioned more stably; during turning, a better turning quality can be obtained; and owing to the in-tandem supporting mode, when the workpieces are turned around to be clamped, a good repeated clamping coaxiality can be acquired. The outward expansion mandrel is simple in structure, high in positioning precision and long in service life.

Description

technical field [0001] The invention relates to an outwardly expanding mandrel, in particular to an outwardly expanding mandrel with a plurality of supporting parts. Background technique [0002] In the processing of shell parts, when the shape of the part is irregular, or the outside of the part is the rough surface of casting or forging, the outer surface of the part cannot be directly used as the positioning and clamping surface , Most of the time, it is necessary to position and clamp in the form of supporting the inner hole. Generally, when supporting the inner hole, tooling fixtures such as external expansion mandrels are used. [0003] However, when the length of shell parts is long, the clamping and positioning will be unstable depending on the support of the expanding mandrel at a certain section, and in many cases, the clamping force is not enough, which may cause the workpiece to be damaged during subsequent machining. Loosening or moving will cause the workpiece...

AI Technical Summary

Problems solved by technology

[0003] However, when the length of shell parts is long, the clamping and positioning will be unstable depending on the support of the expanding mandrel at a certain section, and in many cases, the clamping force is not enough, which may cause the workpiece to be damaged during subsequent machining. Loosening or moving will cause the workpiece to be scrapped, and it will also easily cause the vibration of the tool during the machining process, which is not conducive to the formation of a qualified machining cutting surface

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