METHOD OF IDENTIFYING CAUSE OF SPRINGBACK AND APPARATUS OF IDENTIFYING CAUSE OF SPRINGBACK

摘要

A method of identifying a cause of springback includes a step of performing a press forming analysis, a step of performing a springback analysis on the basis of information acquired by the press forming analysis, a step of dividing a shape of a press forming product acquired by the press forming analysis into a plurality of regions, a step of changing Young's modulus in a designated direction in any region of the divided regions, a step of performing the springback analysis on the press forming product whose Young's modulus is changed, a step of acquiring springback amount differences on the basis of multiple springback analysis results, and a step of identifying the cause of the springback on the basis of the acquired springback amount differences.

主权项

1. A method of identifying a cause of springback of a press forming product, the method being performed by a computer and comprising:
a press forming analysis step of acquiring a shape, a residual stress distribution, and a strain distribution of the press forming product before a die release by performing a press forming analysis; a first springback analysis step of acquiring a springback amount of the press forming product after the die release by performing a springback analysis on the basis of the shape, the residual stress distribution, and the strain distribution of the press forming product acquired at the press forming analysis step; a region dividing step of dividing the shape of the press forming product acquired at the press forming analysis step into a plurality of regions; a Young's modulus changing step of selecting any region of the regions of the press forming product divided at the region dividing step, and changing Young's modulus in a designated direction in the selected region; a second springback analysis step of acquiring the springback amount of the press forming product after the die release for each selected region and designated direction by performing the springback analysis on the press forming product whose Young's modulus is changed at the Young's modulus changing step on the basis of the shape, the residual stress distribution, and the strain distribution of the press forming product acquired at the press forming analysis step; a springback amount difference acquisition step of acquiring the springback amount difference between the springback amount acquired at the first springback analysis step and the springback amount for each selected region and designated direction acquired at the second springback analysis step; and a springback cause identifying step of comparing the springback amount differences acquired at the springback amount difference acquisition step with each other, and identifying a residual stress and its direction having caused the springback on the basis of a result of the comparison.