Producing hardened components made of hardening steel, comprises heating components on racks in continuous furnace, molding and hardening components in thermal molding- and press hardening process and removing components from molding press

摘要

The method comprises heating components on racks (1) in a continuous furnace at a temperature over the AC 3point of the alloy, molding and hardening the components in a thermal molding process and a press hardening process, removing the components from a molding press, and targeted reheating defined areas of the components to increase the ductility again in the defined areas. The components in the defined areas have higher ductility than in other areas. The components in the defined areas are specifically tempered. The components are repeatedly applied on the still hot racks. The method comprises heating components on racks (1) in a continuous furnace at a temperature over the AC 3point of the alloy, molding and hardening the components in a thermal molding process and a press hardening process, removing the components from a molding press, and targeted reheating defined areas of the components to increase the ductility again in the defined areas. The components in the defined areas have higher ductility than in other areas. The components in the defined areas are specifically tempered. The components are repeatedly applied on the still hot racks after removing from the molding press and the remaining heat of the racks is used to heat the hardened components in the defined areas. A heat entry is introduced in the components in the defined areas and restores in the output structure. The reheating of the components is carried out by an unheated furnace part during returning the racks. The temperature of the racks during returning the racks is 930-300[deg] C. The processing time of the furnace for returning the racks is 2-6 minutes.