Aluminum alloy for vehicle body plate and method for manufacturing same

Abstract

The present invention provides an aluminum alloy used on an automotive body board, and a manufacture method thereof. The aluminum alloy has the components as follows: Si is 0.8 to 1.5wt percent, Fe is 0.05 to 0.20wt percent, Cu is 0.01 to 0.11wt percent, Mn is 0.02 to 0.1.wt percent, Mg is 0.51 to 0.7wt percent, Cr is 0.1wt percent, Zn is 0.25wt percent, Ti is 0.15wt percent, rare-earth Ce is 0.01 to 0.2wt percent, and the other weight percentage is composed of Al. The invention has the technology that the Al is added in a resistance furnace first; master alloys that are AlSi20, AlCu50, AlMn10, AlCr5, and Al-5Ce are added and stirred when the Al is melted down and the temperature of fused mass is 740 to 760 DEG C; the Mg, and the Zn are added when the temperature of the fused mass is reduced by 720 to 730 DEG C, and then the beating and refining are performed; Al-5Ti-B is added in and stirred when the temperature reaches 730 to 740 DEG C, and then the mixture is stood for 10 to 25 minutes, and is casted and molded in a cast iron die; then aluminum alloy cast ingot is processed through homogenization treatment, and rolled into thin slabs; the thin slabs are processed through water quench after solution treatment, so that finished products are obtained. The aluminum alloy has better roasting hardening capacity, has lower yield strength and higher plasticity before punching, facilitates for punching and molding, and has increased yield strength after roasting hardening so as to satisfy the shock resistance request of the automotive body board.

Description

technical field [0001] The invention relates to an aluminum alloy, in particular to a rare earth-containing aluminum alloy for automobile body panels and a manufacturing method thereof, belonging to the technical field of aluminum alloys. Background technique [0002] At present, energy, environmental protection, and safety are the three major issues facing the automotive industry in the world today. Automobile lightweight is an effective way to reduce energy consumption, improve automobile fuel economy, and reduce environmental pollution. Aluminum alloy materials have become the most ideal material for automobile lightweight due to their high specific strength, corrosion resistance, good impact resistance, easy surface coloring, good processing formability, and high recycling and regeneration properties. Since the car body accounts for about 40% of the total vehicle weight, the aluminum body has attracted much attention in recent years. The heat-treatable 6xxx series alumi...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide an aluminum alloy for automobile body panels and its manufacturing process, aiming to effectively solve the problems of low strength after baking paint for aluminum alloy automobile panels with low Cu content, so that the materials can meet Requirements for impact resistance of automotive panels

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