Method of making coated steel part with regions of different ductility
AssigneeBenteler Automobil Technik GmbH
InventorLudger Gehringhoff
Life of this patent
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Abstract
A workpiece having regions of different ductility is made by first coating opposite faces of a flat sheet-metal workpiece of low ductility and then stripping the coating from the faces in one region of the workpiece while leaving the coating on the faces in another region of the workpiece. The workpiece is then deformed into a three-dimensional profile. Only the one uncoated region of the workpiece is heated and thereby hardened while not significantly heating the other coated region of the workpiece.
Claims5
A method of making a workpiece having regions of different ductility, the method comprising the steps of:
- coating opposite faces of a flat sheet-metal workpiece of low ductility;
- stripping the coating from the faces in one region of the workpiece to form an uncoated region while leaving the coating on the faces in another region of the workpiece;
- deforming the workpiece into a three-dimensional profile;
- and
- heating and thereby hardening only the one uncoated region of the workpiece while not significantly heating the other coated region of the workpiece.
A method of making a motor-vehicle B-colum having regions of different ductility, the method comprising the steps of:
- cutting a flat plate workpiece from a strip of sheet steel of low ductility;
- hot coating opposite faces of the plate workpiece with zinc;
- stripping the zinc coating from the faces in one region of the workpiece to form an uncoated region while leaving the coating on the faces in another region of the workpiece;
- deforming the workpiece into a three-dimensional profile;
- and
- heating and thereby hardening only the one uncoated region of the workpiece while not significantly heating the other coated region of the workpiece.
Dependencies are inferred from the claim text.