Aluminum alloy and aluminum alloy extruded profile machining method

Abstract

The invention discloses aluminum alloy and an aluminum alloy extruded profile machining method. The aluminum alloy comprises, by weight, 0.6-1.4% of Si, 0.7-1.3% of Mg, 0.1-1% of Cu, 0.1-1% of Mn, 0.01-0.15% of Ti, 0-0.2% of Zr, 0-0.5% of Cr, 0-0.4% of Fe, 0-0.25% of Zn and the balance Al. The aluminum alloy also meets the requirements that the weight percentage range of Mg+Si+Cu is 1.4-3.7%, themole ratio of Mg to Si is 0.7-1.5, and the weight percentage range of Mn+Cr+Zr is 0.1-1.5%. The machining method comprises the steps that (1) a cast ingot of the alloy is subjected to homogenization treatment; (2) the cast ingot is extruded into aluminum profile; (3) extrusion production is conducted; (4) on-line quenching is conducted; (5) tension leveling is conducted; and (6) artificial aging is adopted. According to the aluminum alloy and the aluminum alloy extruded profile machining method, the technology is simple, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a processing method of an aluminum alloy and an extruded profile thereof. Background technique [0002] In recent years, with the implementation of national energy conservation and emission reduction, green environmental protection policies and regulations, the pace of creating a resource-saving and environment-friendly society has accelerated, and the lightweight of automobiles has attracted more and more attention from the society. Aluminum and its alloy processing materials have a series of excellent characteristics such as low density, high specific strength, good impact resistance, corrosion resistance, good processing formability, high recycling and regeneration, and become the most ideal for realizing automobile lightweight. material of choice. With the development of lightweight automobiles, more stringent requirements are put forward for the mechanical proper...

AI Technical Summary

Problems solved by technology

[0003] Although 2xxx series and 7xxx series aluminum alloys have high strength, they are not easy to extrude, and it is difficult to produce hollow profiles with complex shapes.

6xxx series aluminum alloys are medium-strength aluminum alloys, but their relatively low strength severely restricts the application of 6xxx series alloys in some profile members with high strength requirements

[0004] 6xxx series profiles often need to be welded by MIG / TIG on traffic vehicles, and the strength of the welded joints softens seriously, which greatly affects the service life and safety performance of the vehicle

Patent CN201310645740.6 discloses an aluminum alloy with ultra-high strength, low quenching sensitivity and weldability. By adding rare earth elements such as Ce, the casting structure of the alloy is refined and the sensitivity to welding cracks is reduced.

However, the alloys prepared by the above patents often add rare earth elements Ce, Y, etc. and precious metal elements Ag, Sc, Li, etc., the ingot preparation process is complicated, the heat treatment and extrusion molding process of the profile is difficult to control, and the cost of the alloy is relatively high, so it is not applicable. Industrial aluminum profiles for high-volume applications

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