Device and method for polishing special-shaped metal tube inner wall

Abstract

The invention discloses a device and method for polishing a special-shaped metal tube inner wall, and belongs to the technical field of precision tube inner wall polishing and grinding machining. Themethod comprises the steps that magnetorheological fluid is injected into a gap formed by a special-shaped metal tube and a mandrel; through applying magnetic fields with different intensities to different areas inside the special-shaped metal tube, a polishing film is formed by the magnetorheological fluid inside the special-shaped metal tube on the inner wall of the special-shaped metal tube under the action of the magnetic fields; and through controlling the magnetorheological fluid to move in the special-shaped metal tube, the omni-directional high-efficiency polishing treatment on the inner wall of the special-shaped metal tube is carried out by the abrasive in the magnetorheological fluid. Compared with a conventional polishing method, the method has the advantages that the machiningefficiency is high, the use amount of the magnetorheological fluid is small, the machining purposes of different roughness degrees of different parts of the inner wall of the special-shaped metal tube can be realized, the personalized requirements are met, the polishing precision is high, the phenomenon of tool wear and blockage is avoided, the removal rate is high, and no sub-surface damage is introduced.

Description

technical field

[0001] The invention belongs to the technical field of precision pipe inner wall polishing and grinding, and in particular relates to a polishing device and method for the inner wall of a special-shaped metal pipe. Background technique

[0002] Metal pipes are widely used in petroleum, chemical, medical, food, light industry, mechanical instrumentation and other industrial pipelines and mechanical structural components. In some fields with high precision requirements, there are high requirements for the surface roughness of the inner wall of metal pipes. The roughness requirements of the inner wall of complex special-shaped metal pipe fittings are relatively high (Ra0.012~Ra0.025), or the roughness requirements of different parts of the inner wall of special-shaped pipe fittings are also different under certain conditions.

[0003] At present, the methods that can roughen the interior of metal pipes mainly include: inner coating method, chemical polishing met...

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