HOT-STAMPING FORMING METHOD FOR LIGHTWEIGHT ALUMINUM ALLOY VEHICLE BODY COMPONENT

摘要

A hot-stamping forming method for a lightweight aluminum alloy vehicle body component, comprising: placing an original T6-state aluminum alloy sheet blank in a heating device for quick heating, the heating rate being 1-10 °C/s and the heating temperature being 50-300°C lower than the solution temperature of the alloy, and then maintaining the temperature for 10-300 s; then, quickly transferring the blank to a water-cooling mold for hot-stamping forming, and performing pressure holding and quenching in the mold at a cooling rate of not less than 30 °C/s to obtain a formed part. The blank used is a T6-state aluminum alloy, a T4-state vehicle body part can be obtained without performing subsequent solution and aging heat treatment that is necessarily used in a conventional stamping process for strengthening, and the part is further strengthened in a subsequent paint baking procedure to obtain T8-state mechanical properties. The method shortens the production period of hot forming, greatly improves the production efficiency, and can also ensure the usage performance of products.