Method of press-hardening a hot-shapable plate
AssigneeBilstein GmbH & Co. KG
InventorSeyed Amin Mousavi Rizi
Life of this patent
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Abstract
A hot-shapable uncoated steel-plate workpiece is press hardened by first transporting the plate through a heating zone continuously or discontinuously and there heating the plate to an austenitizing temperature while blocking entry of oxygen into the heating zone. Then the heated plate is cooled in a cooling zone to a martensitizing temperature below the austenitizing temperature without contacting the heated plate with oxygen. Finally, immediately and without cooling of the cooled workpiece to a martensite start temperature, the cooled workpiece is deformed at least partially in a finishing press into a desired shape.
Claims20
A method for press hardening of a hot-shapable uncoated steel plate, the method comprising the steps of:
- transporting the plate through a heating zone continuously or discontinuously;
- heating the plate in the heating zone to an austenitizing temperature while blocking entry of oxygen into the heating zone;
- cooling the heated plate in a cooling zone to a martensitizing temperature below the austenitizing temperature without contacting the heated plate with oxygen;
- and
- immediately and without cooling of the cooled workpiece deforming the cooled workpiece at least partially in a finishing press into a desired shape.
Dependencies are inferred from the claim text.