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Production Technology Analysis of Automotive Aluminum Sheet

Automotive aluminum sheet is one of the high-end aluminum alloy varieties. Due to its strict requirements on performance and surface quality, it also puts forward more precise control and management requirements for the processing of raw materials.

The automotive sheet metal thickness is generally 0.8~1.6mm, and the maximum width is 2300mm. Its performance requirements are: good formability, low yield ratio and high forming limit, strong surface smoothness, no Roping Line, good weldability, excellent bake hardening.

Automotive aluminum sheet.jpg

There are many key technologies and difficulties in the production of automotive aluminum sheets, which will also have an important impact on subsequent performance (stamping, coating, etc.)

The production process of automotive aluminum sheets can be simply attributed to two aspects from the perspective of microstructure: cleanliness (chemical metallurgical process) and uniformity (physical metallurgical process). In the actual mass production process, it refers to the control process of smelting (casting) and rolling (heat treatment).

Excellent cleanliness of molten aluminum and uniformity of structure (texture) will have a positive effect on the stamping and connection performance of subsequent automobile production plants. The uniformity of the organization (texture) includes both the size of the grain size of the matrix organization and the proportion of the micro-texture that is conducive to formability.

In view of the mismatch between the aluminum sheet factory and the production time of the automobile factory, the natural aging of the automobile aluminum sheet will occur during the phase-to-phase process, which will affect the subsequent molding.

In order to solve this problem, material engineers at home and abroad have carried out in-depth and systematic research on the theoretical mechanism of this process, and proposed a pre-aging/pre-straining treatment process. Through the pre-aging process after solid solution treatment in the raw material factory, the natural aging problem during the transportation and storage of the aluminum plate can be slowed down, so that it has better formability during the stamping process.

Reasonable treatment of the surface of the aluminum plate is beneficial to the subsequent coating treatment. Surface treatment is divided into mill finish (MF), electron discharge texture (EDT) and electron beam texture(EBT). The surface of the aluminum plate treated by EDT and EBT is isotropic, and has no directional influence on the subsequent formability; the formed surface texture can store lubricant, reduce the sensitivity to abrasion, and has no obvious influence on the friction behavior.

As one of the automotive aluminum suppliers, Haomei Aluminum mainly offers 5xxx and 6xxx aluminum sheets for car making. Welcome to leave message below to inquire what you need.

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