Nickel-titanium-based shape memory alloy pipe joint thermal spinning forming processing device and method

Abstract

The invention provides a nickel-titanium-based shape memory alloy pipe joint hot spinning forming machining device and method. The nickel-titanium-based shape memory alloy pipe joint hot spinning forming machining device comprises five mandrel inserts, a bottom plate, a base plate, screws, a positioning block and a pin; according to the five mandrel inserts, the first mandrel insert and the thirdmandrel insert are the same in structure and symmetrical, the inner walls of the first mandrel insert and the third mandrel insert are provided with a first dovetail groove and a second dovetail groove correspondingly, the outer wall of the second mandrel insert is provided with a first dovetail and a second dovetail, and the first dovetail groove and the second dovetail groove are matched with the first dovetail and the second dovetail groove correspondingly; and the four mandrel insert and the fifth mandrel insert are the same in structure and symmetrical, the bottoms of the four mandrel insert and the fifth mandrel insert are provided with a third dovetail and a fourth dovetail correspondingly, the base plate is provided with third dovetail grooves, and the third dovetail and the fourthdovetail are matched with the third dovetail grooves. According to the nickel-titanium-based shape memory alloy pipe joint hot spinning forming machining device and method, the problem that demoldingis difficult after an annular inner rib is formed is solved, precise forming of the shape memory alloy pipe joint inner rib can be achieved, no machining trace is left on the inner rib, and the stress corrosion resistance of a pipe joint can be improved.

Description

technical field [0001] The invention relates to a pipe joint processing device and method, in particular to a nickel-titanium-based shape memory alloy pipe joint spinning forming processing device and method, belonging to the field of spinning forming processing. Background technique [0002] Nickel-titanium-based shape memory alloys have been widely used in the fields of aerospace and ships because of their shape memory effect. The most typical application case is the shape memory alloy pipe joint. The basic principle of the application of nickel-titanium-based shape memory alloy pipe joints is as follows: In the low-temperature martensitic phase, the shape memory alloy pipe joint with an inner diameter smaller than the outer diameter of the connected pipe is expanded and deformed to make the inner diameter larger than the outer diameter of the connected pipe. Then the connected pipe is inserted into the pipe joint, and then the pipe joint is heated to the austenite phase, ...

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Problems solved by technology

However, since these annular ribs are located on the inner wall of the pipe joint, they are usually processed by machining. However, the processing of nickel-titanium-based shape memory alloys is more difficult, and the tool wear is serious. In addition, the nickel-titanium-based shape memory alloys have greater elasticity and difficult dimensional accuracy. ensure

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