Structural component of a motor vehicle shell to provide an excellent compromise between mechanical strength and crash resistance

摘要

Method for producing a deep-drawn component of a motor vehicle body or body structure, also called "body shell", of aluminum alloy for the irreversible absorption of energy in an impact with the following steps: Producing a sheet or strip of between 1 and 3,5 mm thickness from an alloy of the composition (in% by weight): Si 0.60 - 0.85; Fe 0.05-0.25; Cu 0.05-0.30; Mn 0.05-0.30; Mg 0.50 - 1.00; Ti 0.02 - 0.15; V 0.00-0.15, other elements in each case 0.05 and altogether 0.15, balance aluminum, with Mg -2.67 × Si + 2.87, Solution heat treatment, quenching and possibly pre-aging at a temperature between 50 and 100 ° C for a period of at least 12 hours, typically by coiling at a temperature of at least 60 ° C and subsequent cooling in air, Cold aging at room temperature typically between 72 hours and 6 months, Forming by deep drawing under pressing to obtain a three-dimensional part - aging the part at a temperature of substantially 205 ° C with a holding time between 180 and 480 minutes or aging under equivalent temperature-time conditions, - Painting and "hot aging treatment by Lackeinbrennen" or "bake hardening" at a temperature of 150 to 190 ° C and preferably 170 to 190 ° C for 15 to 30 min.