To optimize press formation conditions and collision analysis conditions and also to determine spot welding conditions, in spot welding of a press-formed article of a tailored blank.
Plate thickness distribution and distortion distribution of the press formed article are calculated by press formation analysis based on a stress-distortion relationship, a weld line position and the like of a tailored blank, and collision energy absorption and deformation mode are calculated by collision analysis based on, as the collision analysis conditions, the plate thickness distribution and the distortion distribution of the press formed article, member shape, impact load, the number of spot welding and nugget diameter. The above press formation analysis and collision analysis are repeatedly performed while changing at least one of the press formation condition and collision analysis condition to calculate the press formation condition and collision condition giving the maximum value of the collision energy absorption. Thereafter, on the basis of the weld line position of the tailored blank, the plate thickness distribution of the press formed article, the number of spot welding, and the nugget diameter which have been calculated in the repeated calculation, spot weld zone analysis is performed to calculate the welding conditions of the spot welding.
NIWA TOSHIYUKI
YOSHIDA HIROSHI
ISOGAI EIJI
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