Memory alloy pipe joint stretch hole expanding device and method

Abstract

The invention provides a memory alloy pipe joint stretch hoe expanding device and method. The device comprises a hole expanding sleeve, a hole expanding rod and a stretcher, wherein the hole expandingsleeve comprises a mounting body and a sleeve body located at one end of the mounting body; the end, close to the sleeve body, of the mounting body is provided with a first mounting hole; a pipe joint waiting for hole expanding is mounted in the first mounting hole; the hole expanding rod is used for penetrating through the pipe joint waiting for hole expanding; a hole expanding cone of the holeexpanding rod is located in the first mounting hole and located on the side, close to the sleeve body, of the pipe joint waiting for hole expanding; the end, far away from the hole expanding cone, ofthe hole expanding rod penetrates through the end, far away from the sleeve body, of the mounting body; and an upper jaw and a lower jaw of the stretcher are connected with the ends, far away from thehole expanding cone, of the sleeve body and the hole expanding rod. Through bi-directional stretch loading of the upper jaw and the lower jaw of the stretcher, the problem that a long hole expandingrod is likely to lose stability when bearing large unidirectional pressure in existing compression modes is effectively prevented, and the hole expanding efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of diameter expansion of memory alloy pipe joints, in particular to a stretching diameter expansion device and method for memory alloy pipe joints. Background technique [0002] Shape memory alloy tubes are pipe fittings made of smart materials that can remember their original shape. Pipe joints made of the same material are widely used in aviation, petroleum and shipbuilding due to their outstanding sealing properties. [0003] Shape memory alloy pipe joints can realize the connection of two pipes, which is different from threaded mechanical connection and welding. The shape memory alloy pipe joint is a simple cylinder, which is machined in the parent phase state, its inner diameter is slightly smaller than the outer diameter of the connected piece, and the inner diameter is machined with ridges. During application, the shape memory alloy pipe joint is cooled to the martensitic state, and the diameter of t...

AI Technical Summary

Problems solved by technology

[0004] The diameter expansion device of the memory alloy pipe joint that exists at present usually expands the hole by unidirectionally compressing

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