Bending crack evaluation method, bending crack evaluation system, and manufacturing method of press-formed parts

摘要

Provided is a technique for evaluating a molding margin with respect to bending cracks in the shear cross section of a press-formed part when press-molding to a target press-formed part from shape information of a real part or the like. This is a method of evaluating the forming allowance for bending cracks in the shear cross-section, which is the shear-processed cross-section, in manufacturing the target press-formed part by performing press forming including bending deformation on the shear-processed metal plate. From the shear cross-section or non-bending deformation in the vicinity of the shear cross-section obtained based on the part shape of the press-molded part, and the bending radius of the press mold of the portion forming the shear cross-section in the press mold used in press molding, the A crack index value for evaluating the bending crack in the shear section is obtained, and the forming allowance for the bending crack is evaluated based on the obtained crack index value.