Forming technology of aluminum alloy thin-walled pipe

Abstract

The invention relates to a forming technology of an aluminum alloy thin-walled pipe. The technology comprises the following steps of firstly extrusion, wherein an aluminum alloy ingot is extruded into a round pipe blank; secondly, secondary extrusion, wherein the round pipe blank is secondarily extruded to increase the diameter of the round pipe blank, and reduce the wall thickness of the round pipe blank; thirdly, milling and annealing, wherein annealing treatment is carried out on the secondarily-extruded round pipe blank; fourthly, rolling, wherein the annealed round pipe blank is rolled so as to reduce the diameter and the wall thickness of the round pipe blank; fifthly, diameter reduction annealing, wherein annealing treatment is carried out on the round pipe blank obtained after diameter reduction; sixthly, stretching, wherein the round pipe blank obtained after diameter reduction annealing is stretched to form a flat round pipe semi finished product; seventhly, third-time extrusion, wherein the semi finished product forms a finished products through a mould hole; and eighthly, quenching, wherein the middle of the upper surface and the middle of the lower surface of a flat round pipe are quenched, and therefore the hardness of the upper surface and the hardness of the lower surface are increased.

Description

technical field [0001] The invention relates to an aluminum alloy thin-wall pipe forming process. Background technique [0002] Due to its excellent performance, the existing aluminum alloys are being used more and more widely, but for some special needs, aluminum alloys cannot meet the needs only by extrusion. Such as thin-walled pipes, if such pipes only rely on one-time extrusion or simple reprocessing, their performance is often difficult to meet the requirements. Now there is a need for a type of oval thin-walled pipe, which not only requires high hardness and light weight, but also requires that it is not easy to break when receiving impact, but has a certain deformation to form a buffer. This kind of material cannot be produced through ordinary techniques. [0003] China Patent No.: 201210558833.0 discloses a production process of an aluminum alloy drop-shaped thin-walled pipe, including steps: 1) extrusion: extruding the ingot into a round pipe wool; 2) rolling ann...

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Problems solved by technology

The pipe material disclosed in this patent is relatively similar to the required product, but in actual tests, many shortcomings have been found, for example: 1. The quality of the product obtained when testing according to the annealing temperature and quenching temperature thereon is relatively poor; 2. When directly using the above-mentioned process steps for production, when the thickness of the required aluminum alloy pipe is far from the thickness disclosed in the above examples, it cannot be formed smoothly, and it is easy to damage the internal structure of the aluminum alloy, resulting in its performance A sharp decline