Spinning method for high-precision large-size thin-wall aluminum alloy pipe

Abstract

The invention belongs to the technical field of metal pipes, and particularly relates to a high-precision large-size thin-wall aluminum alloy pipe spinning method which comprises the following steps: preparing a hollow pipe blank by adopting a high-temperature backward extrusion forming process, carrying out three-pass spinning thermal forming on the hollow pipe blank, and carrying out necessary intermediate annealing treatment and acid pickling to obtain a semi-finished pipe blank; and finally, the semi-finished pipe blank is subjected to long-core-rod 1-2-pass cold rolling, and after vacuum annealing, the high-precision large-size thin-wall aluminum alloy pipe is obtained. The hollow pipe blank with the uniform inner surface and the uniform outer surface is prepared through the extrusion procedure, then after three-pass spinning deformation, particle distribution, interface bonding, matrix structures and the like in the hollow pipe blank are improved to a certain degree, the plastic deformation capacity is also effectively improved, and in order to prevent the follow-up spinning deformation from being large, the thickness of the hollow pipe blank is larger than that of the hollow pipe blank. And finally, wall reduction, diameter reduction, finishing and vacuum annealing treatment are carried out on the pipe blank through a cold rolling procedure, and a product is obtained.

Description

technical field [0001] The invention relates to the technical field of metal pipes, in particular to a high-precision large-size thin-walled aluminum alloy pipe spinning method. Background technique [0002] With the development of modern aviation manufacturing industry, higher requirements are put forward for the performance and weight reduction of aircraft. At present, stainless steel pipes are widely used in large-diameter thin-walled pipes with high temperature resistance, medium and high strength required for bleed air, hydraulic pressure, and fuel pipelines of domestic advanced large passenger aircraft and fighter jets. In order to improve the overall flight performance of domestic aircraft and meet the special requirements of relatively light weight, long service life, and long environmental adaptability, it is very necessary to use high-precision, large-size, thin-walled aluminum alloy pipes with excellent comprehensive performance in aircraft. The density of alumin...

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a high-precision large-size thin-walled aluminum alloy pipe spinning method, which solves the problem that the three processing methods of extrusion, rolling, and spinning are difficult to process in the current aluminum alloy pipe. Problems with combining

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