Abstract: Constructing the sliding constraint surface which is introduced to guide the movement of nodes on intermediate configurations is one process of the multi-step inverse approach in sheet metal forming. Because of the poor handling complicated parts of traditional methods in constructing the sliding surface, the pseudo minima area approach based on the optimization is developed by the authors’ group. The algorithm assumes that the sliding surface has minima area of all possible curved surfaces under the constrains of the current positions of die and punch, and the optimization is solved by the trust-region methods. By numerical simulation on spring bracket and center pillar, the effectiveness of the pseudo minima area approach is verified.

Key words: Pseudo-minima area, Sheet metal forming, Sliding constraint surface, Ti/Al Nano-Multilayer Foil Ti2AlNb alloy Hot-press sintering Microstructure Hardness