Precise forming method of aluminum alloy thin-walled cylinder

Abstract

A precise forming method of an aluminum alloy thin-walled cylinder includes the following steps of firstly, using aluminum alloy hollow cast ingot obtained through semi-continuous casting as an original blank; secondly, heating the aluminum alloy hollow cast ingot; thirdly, using a forward extruder as a forming device; fourthly, annealing the cylinder blank; fifthly, processing the surface of thecylinder blank; sixthly, performing variable-diameter cold-drawing on the cylinder blank through a pipe cold-drawing machine; seventhly, performing solid solution treatment on the part obtained aftervariable-diameter cold-drawing; eighthly, executing the operation in the fifth step again; ninthly, performing fixed-diameter cold-drawing on the part processed in the eighth step through the pipe cold-drawing machine; tenthly, performing ageing treatment on the part; and eleventhly, obtaining the cylinder qualified in flaw detection. In the method, a deformation heat treatment technology is adopted, the final round of cold-drawing is executed between the two steps of solid solution and ageing, no severe water-cooling solid solution treatment is performed on the part obtained after cold-drawing deformation any more, and the surface quality and size precision of the cylinder can be effectively ensured.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy pressure processing, in particular to a precision forming method of an aluminum alloy thin-walled cylinder. Background technique [0002] Heat-treatable aluminum alloys such as 2XXX, 6XXX, and 7XXX are widely used in aerospace, weaponry, nuclear power, and high-end civilian markets due to their excellent mechanical properties. Aluminum alloy thin-walled cylinders refer to large-diameter thin-walled seamless pipes with a diameter greater than 200mm and a wall thickness of 2 to 10mm. They are widely used in aerospace small fuel tanks, high-end gas cylinder tubes, aerospace and nuclear power pipelines and other fields. [0003] The traditional production methods of aluminum alloy seamless pipes include forward extrusion, reverse extrusion, hot rolling, spinning, etc., but the above methods have certain limitations in the manufacture of thin-walled seamless pipes, such as forward extrusion, rev...

AI Technical Summary

Problems solved by technology

[0003] The traditional production methods of aluminum alloy seamless pipes include forward extrusion, reverse extrusion, hot rolling, spinning, etc., but the above methods have certain limitations in the manufacture of thin-walled seamless pipes, such as forward extrusion, reverse extrusion Pressing is mostly used to produce thick-walled tubes. The diameter of hot-rolled tubes is small, and the surface of spinning tubes has spin marks and short lengths.

In addition, the heat-treatable aluminum alloy thin-walled cylinder will produce a large degree of deformation during heat treatment, which makes it difficult to correct the shape and has low dimensional accuracy.