SHAPE FREEZABILITY EVALUATION METHOD FOR PLASTIC WORKING

摘要

PROBLEM TO BE SOLVED: To provide a shape freezability evaluation method evaluating a shape freezability in plastic working of a structure control type new material aimed at function enhancement as a basic material characteristic. SOLUTION: This shape freezability evaluation method for plastic working is characterized by that a material piece 2 to be measured is mounted on a die 1 in an unconstrained state, the material piece is pressed by a punch 3, a differenceΔθbetween a bending angle of the material piece at this point and a bending angle of the material piece when the pressing force is released afterwards is used as a spring back amount, and the spring back amount is compared with a spring back amount of a known material determined beforehand in the same condition as the spring back amount to evaluate the shape freezability of the material piece.