Patent ID: 9616488
Date: 2017-04-11
CPC Classifications: B21J,B21K,B62D,C21D,C22C,C23C,F27B,F27D

Claim:
1. A method for producing structural or chassis components for a motor vehicle by hot or warm forming, comprising: providing a heating station comprising at least one burner zone, said at least one burner zone comprising at least one burner; operating the at least one burner with a combustible gas and an oxygen containing gas to thereby generate a burner flame; heating at least a first region of a sheet metal blank in the at least one burner zone from a starting temperature to a target temperature by bringing the sheet metal blank into direct contact with the burner flame generated by the burner; heating an aluminum silicone pre-coated sheet metal blank in the heating station to a temperature smaller than Ac3 until pre-alloyed; and heating the sheet metal blank in a furnace arranged downstream of the heating station to a temperature greater than Ac3 until completely austenized and alloyed through; transferring the heated sheet metal blank into a cooled pressing tool; and forming and press hardening the sheet metal blank in the cooled pressing tool to a finished component; wherein during the heating in the heating station at the same time at least a partial alloy layer is formed on the surface of the sheet metal blank, thereby an aluminum silicone layer transforms from inside to outside into an intermetallic iron aluminum silicone layer due to diffusion process, wherein an oxygen content of the oxygen-containing gas is greater than 90%, and wherein oxygen atoms not reacted during the combustion counteract a hydrogen embrittling in a heat influence zone, the hydrogen embrittling counteracted by a temperature profile with a heating rate of greater than 70K/s.