Preparation method of 6111 aluminum alloy plate for automobile body

Abstract

The invention provides a preparation method of a 6111 aluminum alloy plate for an automobile body. The preparation method comprises the following steps that (1) a 6111 aluminum alloy ingot is preparedby a DC casting method; (2) the ingot is heated to 200-400 DEG C, and heat is preserved for 2-6 hours, the ingot is heated to 460-500 DEG C, heat preservation is carried out for 2-4 hours, and discharging and hot rolling are carried out; (3) a hot rolled plate is heated to 480-550 DEG C, the temperature is kept for 2-6 hours, and the hot rolled plate is cooled along with a furnace; (4) cold rolling is carried out; (5) solid solution treatment on the cold-rolled plate is carried out; (6) the cold-rolled plate is placed for 5-15 minutes at the room temperature; (7) pre-aging treatment is carried out; and (8) the cold-rolled plate is placed at room temperature, namely the plate subjected to pre-aging treatment is placed at room temperature for more than 4 weeks. The method not only can shorten the production process of a 6111 aluminum alloy body plate, saves the energy, greatly reduces the production cost of the 6111 aluminum alloy body plate, and can remarkably improve and the stampingforming property and the baking varnish hardening property of the 6111 aluminum alloy body plate.

Description

Technical field: [0001] The invention belongs to the technical field of aluminum alloy plates for automobile bodies, and in particular relates to a preparation method of 6111 aluminum alloy plates for automobile bodies. Background technique: [0002] As the main means of transportation, automobiles have brought convenience to human life, but with the sharp increase in the production and ownership of automobiles, the problems of excessive energy consumption and pollution emissions have become more and more serious. In response to this problem, the best solution is to reduce the weight of the car. There are two main directions for the development of automobile lightweight: one is to use lightweight materials; the other is to optimize the structure. The use of lightweight materials is currently the most feasible way. Among them, the automobile sheet contributes the most to the lightweight of the vehicle and is the key to the lightweight design. The first choice for lightweig...

AI Technical Summary

Problems solved by technology

[0003] The 6xxx series currently being used and developed mainly include several aluminum alloys such as 6016, 6022 and 6111. In North America, the thickness of the outer body of the car is very thin or even less than 1mm, so it pays great attention to strength, so the outer body is mainly made of better strength. 6111 aluminum alloy; this alloy has excellent yield performance after T4P treatment and baking, which greatly improves the anti-sag performance of the outer body of the car. At present, the 6111 aluminum alloy sheet has been applied to the outer body of the car; however, The production cost of 6111 aluminum alloy sheet for car body prepared by traditional technology is much higher than that of traditional steel sheet for automobile body, and its deep drawing performance is lower than that of carbon steel sheet. This is the bottleneck problem that hinders the large-scale replacement of steel sheet by 6111 aluminum sheet. ; Therefore, how to further improve the deep drawing performance of 6111 aluminum alloy sheet, and at the same time significantly reduce the processing cost of aluminum alloy body sheet is imperative

Images