High-strength aluminium alloy section bar for automobile battery trays and production method for high-strength aluminium alloy section bar

Abstract

The invention discloses a high-strength aluminium alloy section bar for automobile battery trays. The high-strength aluminium alloy section bar is characterized in that the raw materials of the high-strength aluminium alloy section bar comprise the alloy elements of, in percentage by mass, 1.11-1.30% of Si, 0.70-0.90% of Mg, 0.11-0.20% of Cu, 0.21-0.30% of Fe, 0.65-0.85% of Mn, 0.06-0.10% of Cr, less than 0.05% of Zn, less than or equal to 0.10% of Ti, less than or equal to 0.002% of Ca+Na / and the balance Al. According to the high-strength aluminium alloy section bar for the automobile battery trays and a production method for the high-strength aluminium alloy section bar, an extrusion process adopts a manner of variable speed adjustment control realizing isothermal extrusion, metal elastic deformation generated by a mold being subjected to high temperature, high pressure and thermal friction can be reduced and avoided, the current situation of large head and tail size deviation of long-material products after extrusion can be effectively improved, and meanwhile, the surface temperature basic consistency of the section bar being discharged can also be guaranteed to meet the on-line solid solution (water quenching) requirements; and by means of the adoption of a two-stage aging heat treatment process, the aging strengthening phase is made to be fully and uniformly precipitatedafter the section bar is subjected to two-stage aging treatment, so that the alloy mechanical property requirements are improved.

Description

technical field [0001] The invention relates to a battery tray material and treatment process, in particular to a 6-series high-strength aluminum alloy material and heat treatment process for producing side beam profiles of new energy vehicle battery trays, which can be assembled on battery trays of various types of new energy vehicles Widely popularized and applied in the welding production industry. Background technique [0002] At present, light weight and low cost are important directions for the development of electric vehicles. The requirements for materials for new energy vehicle battery trays are: high precision, good electrical performance, resistance to electrolyte, flame retardant, long-term dimensional stability, light weight, and good mechanical properties , A wide range of applications. In the past, new energy vehicles mostly used steel materials to make electric vehicle power battery trays, and the weight was high. [0003] The application advantages of alum...

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Problems solved by technology

[0009] The new energy vehicle battery tray developed in advance is composed of 7-series Al-Zn-Mg alloy materials welded, but when welding at high temperature, the mechanical properties of the product part fail, which makes the mechanical properties of the welded part low, causing quality defects such as cracking ; In addition, the 7-series Al-Zn-Mg alloy is more sensitive to stress corrosion, and is prone to the risk of tissue cracking during the service life cycle

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