Multi-layer tube assisted rapid inflation device and method for curved pipe fittings made of dissimilar materials

Abstract

The invention belongs to the field of metal plate or pipe, rod or profile machining treatment, discloses a multilayer pipe assisted rapid air expansion device for a curved surface pipe fitting made ofheterogeneous materials, and further provides a forming method utilizing the device. The interior and the exterior of a pipe blank made of the heterogeneous materials are each additionally provided with a layer of coating pipe, wherein the inner coating pipe is used for promoting material forming on the side, with the larger strength, of the pipe blank, and the outer coating pipe is used for limiting material forming on the side, with the smaller strength, of the pipe blank. High-pressure gas is pumped into an inner cavity of the inner coating pipe to achieve multilayer pipe assisted high-temperature rapid air expansion forming. The forming method is used for efficiently and rapidly preparing the pipe fitting formed by butt welding of the large-size heterogeneous materials and having thecomplex curvature and the special-shaped section, the method can effectively avoid the problems such as uncoordinated deformation, curvature mutation and even rupture defects around weld joints due tothe material difference during expansion, the dimensional accuracy of formed parts is controlled, and the formed pipe fitting is excellent in performance and stable in quality. The method can also beused for post-weld shape righting of the complex pipe fitting.

Description

technical field [0001] The invention belongs to the field of processing of metal plates or tubes, rods or profiles, and specifically refers to a multi-layer tube-assisted rapid inflation device and method for curved-surface tube fittings made of different materials. Background technique [0002] Under the harsh operating conditions of aerospace engines such as high temperature, high pressure, high speed and high load, the working environment of various internal components is also quite different, such as the working temperature of the intake port, compressor, combustion chamber, and tail nozzle. big gap. Among them, for some large and complex integral thin-walled components, there are also huge differences in the service environment at different positions of the same component, for example, the working environment of the lip of the air inlet and the position close to the compressor room are significantly different. For the manufacture of such components, when using homogene...

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Problems solved by technology

[0004] Aiming at the problems existing in the existing inflatable forming process of dissimilar materials butt-welded pipes, the invention discloses a multi-layer pipe-assisted rapid inflation device for dissimilar material curved pipe fittings, which uses inner and outer cladding pipes to assist the plasticity of dissimilar materials to welded pipe blanks. Forming, the invention also discloses a forming method using the device, so as to avoid problems such as uncoordinated deformation and weld cracking defects caused by different materials and welds due to different strengths, and solves the problem of forming heterogeneous complexes using butt welding technology. Defects such as residual stress caused by pipe fittings, rough welds, etc.

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