Processing method capable of realizing shape stability of thin-walled pipe fitting

Abstract

The invention relates to a processing method capable of realizing the shape stability of a thin-walled pipe fitting. The processing method comprises the following steps of: sleeving the thin-walled pipe fitting on a mandrel, so that an ultrasonic cutter is contacted with the surface of the thin-walled pipe fitting; applying a prestressed force; and performing high-frequency impact on the surface of the thin-walled pipe fitting by using the ultrasonic cutter, so that ultrasonic energy is directly input into a material through the ultrasonic cutter to perform ultrahigh frequency small-amplitude micro-forging on a workpiece, metal on the surface layer of the workpiece generates plastic deformation flowing in a micro-forging process, atoms and microstructures of the material on the surface layer of the workpiece are activated under the action of ultrasonic energy, a metal residual stress field of the thin-walled pipe fitting is changed, the unstable state of crystal grains is changed into a stable state, the plasticity of the material is greatly improved, the metal is easily subjected to plastic deformation, and the shape of the thin-walled pipe fitting is stabilized.

Description

technical field [0001] The invention relates to a method for processing a thin-walled pipe fitting to ensure its shape stability, and belongs to the technical field of thin-walled pipe fitting processing. Background technique [0002] The ratio of wall thickness to outer diameter of metal thin-walled pipe fittings is usually less than 6%, and some thin-walled pipe fittings have a wall thickness of only tens of microns. Such metal thin-walled pipe fittings are usually stretched, and there is a very large stress, which causes the parts to deform , can not reach the required shape, and its internal crystal grains are seriously deformed, and it is in an unstable state, making the shape of the thin-walled pipe fittings unstable. [0003] Ultrasonic vibration can eliminate stress, and it is generally carried out on castings or weldments with a certain strength, but the application on thin-walled pipes has not been reported, and the shape stability of thin-walled pipes is a technic...

AI Technical Summary

Problems solved by technology

[0002] The ratio of wall thickness to outer diameter of metal thin-walled pipe fittings is usually less than 6%, and some thin-walled pipe fittings have a wall thickness of only tens of microns. Such metal thin-walled pipe fittings are usually stretched, and there is a very large stress, which causes the parts to deform , cannot reach the required shape, and its internal grains are severely deformed and in an unstable state, making the shape of thin-walled pipes unstable

[0003] Ultrasonic vibration can eliminate stress, and it is generally carried out on castings or weldments with a certain strength, but the application on thin-walled pipes has not been reported, and the shape stability of thin-walled pipes is a technical problem that needs to be solved urgently

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