Expanding device and method for shape memory alloy pipe joint

Abstract

The invention discloses an expanding device and method for a shape memory alloy pipe joint. The expanding device comprises an expanding bar, an expanding petal mold, a material baffling plate, a cushion block, a base and bolts, wherein the cushion block is connected to the base through the four bolts, the expanding bar is inserted into a central positioning hole in the base, the expanding petal mold is placed on the cushion block around the expanding bar, the material baffling plate is connected to the cushion block through the four bolts, and a step surface of the expanding petal mold is lower than a step surface of the central hole of the material baffling plate. In an expanding operation process, the shape memory alloy pipe joint sleeves on a cylinder at the top end of the expanding petal mold and is in clearance fit with the expanding petal mold, a small head end of the expanding bar is placed downwards, the expanding bar is stressed to move downwards so as to open the expanding petal mold, and the expanding petal mold is stressed to uniformly move to the periphery so as to directly increase the diameter of the pipe joint. The expanding device is skillful in conception, compactin structure and convenient and rapid to mount and use, the expanding speed and the expanding amount can be easily controlled, the whole expansion and swelling deformation is uniform, and the expanding formation equality of the pipe joint is improved.

Description

technical field [0001] The invention relates to the technical field of pipe joint diameter expansion equipment, in particular to a shape memory alloy pipe joint diameter expansion device and method. Background technique [0002] Shape memory alloy (SMA) is a new type of functional material developed in the early 1960s, and has been widely used in aviation, aerospace and medical fields. Shape memory alloys have a shape memory effect due to their thermoelastic martensitic transformation, that is, the material in the austenitic state is cooled below the martensitic transformation initiation temperature (Ms), and a martensitic transformation occurs. The material under the condition is unloaded after being deformed. When the temperature rises above the martensitic inverse transformation start temperature (As), martensite transforms to austenite, and the deformation generated at low temperature can be recovered. Pipe joints are one of the most successful engineering applications ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a shape memory alloy pipe joint diameter expansion device, which solves the problem that the prior art diameter expansion device will cause local deformation of the pipe joint and damage the inner ridge of the pipe joint, thereby reducing the connection strength, sealing performance and service life of the pipe joint , the problem that the molding quality is not easy to guarantee

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