A Rigid Expanding Device for Shape Memory Alloy Pipe Joints with Internal Ribs

Abstract

The invention relates to a rigid diameter expanding device of a shape memory alloy pipe joint with internal ribs. It includes four parts: conical pressure head, radial expansion die, shape memory alloy pipe joint and limit block. In order to realize the overall and uniform expansion deformation of the pipe joint with internal ribs and not damage the internal ribs of the pipe joint when the radial expansion die is installed and disassembled, the radial expansion die is designed as a combination, consisting of 7 1 / 8 modules, 1 trapezoidal module and 1 parallel module. In order to realize that the pipe joint with inner ribs does not damage the inner ribs during the diameter expansion deformation process, grooves are processed on the outer wall of the radial expansion mold. Compared with the prior art, the invention has the advantages of protecting the internal ribs of the shape memory alloy pipe joint from damage, uniform radial deformation of the pipe joint, simple diameter expansion device, convenient mold processing, low cost, installation before expansion and disassembly after expansion Convenient, suitable for various types of shape memory alloy pipe joint expansion and other advantages.

Description

technical field [0001] The invention relates to a diameter expansion technology of a shape memory alloy pipe joint, in particular to a rigid diameter expansion device of a shape memory alloy pipe joint with inner ribs. Background technique [0002] The traditional connection method of aircraft hydraulic, pneumatic and fuel systems is mainly flare connection, which is the most extensive and mature connection form. However, this connection method is heavy in quality and complex in structure, especially when it is connected with important load-bearing structures, it has a great impact on the static strength and fatigue strength of the structure, the process is complicated, and the reliability and safety are relatively poor. At present, the world's advanced aircraft manufacturing countries have widely adopted shape memory alloy pipe joints without flare connection, and my country's aviation, aerospace, nuclear power and other fields have also begun to use shape memory alloy pipe...

AI Technical Summary

Problems solved by technology

In the current actual production, the diameter expansion method of the shape memory alloy pipe joint with internal ribs usually adopts the rigid expansion rod to forcibly expand the diameter. This expansion method will cause serious damage to the internal ribs of the shape memory alloy pipe joint. Uneven deformation, which will seriously affect the recovery force of shape memory alloy pipe joints and the sealing performance of pipeline connections

The patent "Expansion Device for Shape Memory Alloy Pipe Joints Based on Liquid Medium" (patent number: ZL201210073520.6) introduces a hydraulic expansion method, which is complicated, inconvenient to operate, and difficult to precisely control the expansion amount. Both ends are prone to damage due to line contact

The patents "A Diameter Expanding Device for Shape Memory Alloy Pipe Joints" (Patent No.: ZL 201320553854.3) and "A Radial Telescopic Tube for Diameter Expansion of Shape Memory Alloy Pipe Joints" (Patent No.: ZL201310403082.X) adopt radial Expand the diameter of the shape memory alloy pipe joint with ribs by means of telescopic tube. This expansion method can obtain uniform diameter expansion deformation and protect the internal ribs of the pipe joint, but it is difficult to obtain a large diameter expansion, and for For pipe joints with relatively small inner diameters, this kind of radial expansion pipe based on open slots at both ends will have disadvantages such as difficult installation and disassembly, and inconvenient use.

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