METHOD OF PROCESSING BENT AND DEFORMED PORTION OF METAL MATERIAL AND METAL MATERIAL FOR PLASTIC PROCESSING USED IN THE METHOD

摘要

PURPOSE: A metal material for plastic processing is provided which can contribute to the reduction in weight of a product while maintaining substantially the same strength as that of a conventional product, can be processed economically with relatively simple steps, and provides an excellent final product, and a processing method for forming a bend and deformed portion in the metal material is provided. CONSTITUTION: The method of processing a bent and deformed portion in a metal material comprises forming a strip plate material having a middle part and thinner thickness deviation portions on both sides of the middle part by rolling a metal material; and bending and deforming the strip plate material in its width direction by roll forming to form a bend and deformed portion in the middle part. The method of processing a bend and deformed portion in a metal material is characterized in that while thinner thickness-deviation portions are formed on both sides of a middle part of a metal material by rolling of the metal material, the metal material is bent and deformed in its width direction by roll forming to form a bent and deformed portion in the middle part. The method of processing a bend and deformed portion in a metal material comprises the steps of forming a strip plate material by rolling the metal material, the strip plate material having a middle part, thinner thickness-deviation portions on both sides of the middle part, and a thick stripe portion at a predetermined position in the middle part corresponding to an outer corner of the bent and deformed portion to be formed; and bending deforming the strip plate material in its width direction at a position of the thick stripe portion by roll forming to form the bent and deformed portion.