| 摘要 |
PROBLEM TO BE SOLVED: To provide a spring back amount evaluation method based on an objective index.SOLUTION: A spring back amount evaluation method includes: a section setting process of setting a section that is an evaluation target; a sectional shape acquisition process of acquiring sectional shapes before and after die release in the set section; and a process of calculating a change amount before and after the die release of a physical quantity of one of (a) an absolute value of a maximum value or a minimum value of a sectional secondary moment of the sectional shape, (b) a ratio between the maximum value and the minimum value of the sectional secondary moment of the sectional shape, (c) a difference between the maximum value and the minimum value of the sectional secondary moment of the sectional shape, (d) an absolute value of a length of a long side or a short side of a minimum rectangle surrounding the sectional shape, (e) a ratio between the long side and the short side of the minimum rectangle surrounding the sectional shape, and (f) a difference between the long side and the short side of the minimum rectangle surrounding the sectional shape on the basis of the acquired sectional shapes before and after the die release, and evaluating an opening amount or a closing amount in a specific section of a press-formed article 1 on the basis of the calculated change amount. |
