A device and method for stretching and expanding diameter of memory alloy pipe joint

Abstract

The invention provides a device and method for stretching and expanding diameter of a memory alloy pipe joint. The device comprises: a diameter expanding sleeve, the diameter expanding sleeve includes a mounting body and a sleeve body at one end thereof, and the mounting body is disposed close to one end of the sleeve body The first installation hole, the pipe joint to be expanded is installed in the first installation hole; the expansion rod is used to pass through the pipe joint to be expanded, and the expansion cone of the expansion rod is located in the first installation hole and is located in the first installation hole. The pipe joint to be expanded is close to the side of the sleeve body, and the end of the expanding rod away from the expansion cone passes through the end of the installation body away from the sleeve body; the upper jaw and the lower jaw of the stretching machine are respectively as follows: The sleeve body and the end of the expanding rod away from the expanding cone are connected. Through the bidirectional tensile loading of the upper jaw and the lower jaw of the stretching machine, it can effectively prevent the problem of instability of the long diameter expanding rod under high pressure in one direction in the current compression method; and can speed up the diameter expansion efficiency.

Description

technical field [0001] The invention relates to the technical field of diameter expansion of memory alloy pipe joints, in particular to a device and method for stretching diameter expansion of memory alloy pipe joints. Background technique [0002] Shape memory alloy pipes are pipe fittings made of intelligent materials that can remember the original shape. Pipe joints made of the same material are widely used in aviation, petroleum and marine fields due to their outstanding sealing properties. [0003] The shape memory alloy pipe joint 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 mother phase state. Its inner diameter is slightly smaller than the outer diameter of the connected parts, and the inner diameter is processed with ridges. During application, the shape memory alloy pipe joint is cooled to a martensitic state, and the pip...

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Problems solved by technology

[0004] The existing expansion devices for memory alloy pipe joints usually expand the hole by unidirectionally compressing the expansion rod (such as CN 203541315 U), and the longer expansion rod is prone to instability when subjected to a large one-way pressure

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