Patent ID: 11911816
Assignee: JFE STEEL CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A method for identifying a variation factor portion of a springback amount, the method identifying a portion in a press formed part that is a factor for variation in a springback amount when variation occurs in the springback amount in the press formed part due to scattering in press forming conditions, and comprising:
performing press forming analysis under first press forming conditions set in advance, and calculating a residual stress distribution in a press formed part at a press forming bottom dead center;
performing springback analysis on the press formed part for which the calculated residual stress distribution has been set, and calculating a first springback amount to be caused in the press formed part;
performing press forming analysis under second press forming conditions set differently from the first press forming conditions within a range of the scattering in press forming conditions, and calculating a residual stress distribution in the press formed part at the press forming bottom dead center;
replacing a value of residual stress in a partial area of the residual stress distribution in the press formed part calculated under the first press forming conditions with a value of residual stress in an area corresponding to the partial area of the residual stress distribution in the press formed part calculated under the first press forming conditions;
performing springback analysis on the press formed part for which the value of the residual stress has been replaced, and calculating a second springback amount;
obtaining a difference between the second springback amount and the first springback amount; and
identifying a portion in the press formed part that is a factor for variation in springback amount of the press formed part based on the obtained difference.