Patent ID: 9057114
Filing Date: 2015-06-16
Classification: B60R,B62D,C21D,C22C

Abstract:
1. A method for producing a motor vehicle component, comprising the steps of: heating at least one region of a hot-formed and press-hardened part to a heat-up temperature below a temperature at which austenite begins to form; maintaining the hot-formed and press-hardened part at the heat-up temperature for a holding time sufficient to reduce a hardness of the at least one region to a level smaller than a hardness of another region of the hot-formed and press-hardened part; and cooling down the hot-formed and press-hardened part in at least two phases for time periods sufficient to maintain the reduced hardness in the at least one region and the hardness in the other region of the hot-formed and press-hardened part, thereby forming the motor vehicle component, wherein the time period of a first phase of the two cooldown phases is longer than the time period of a second phase of the two cooldown phases, with the second phase immediately following the first phase, wherein the hot-formed and press-hardened part is cooled down in the first phase of the cooldown to a temperature between 500° C. and 700° C. and in the second phase to a temperature below 200° C., and wherein a transition zone between the at least one region and the other region is less than 50 mm.