关键词: 材料合成与加工工艺, 多点拉形, 数值模拟, 压痕, 弹性垫

Abstract: The fundamentals of the digital multipoint stretching process were introduced. The numerical simulations for the traditional stretching and the digital multipoint stretching process of the saddle part were performed by ANSYS/LSDYNA software. The generation and suppression of dimples in the multipoint stretching process were studied. The results showed that the enveloping dimple and the concaveconvex dimple are the main styles produced in the multipoint stretching process. The dimples can be suppressed effectively by application of the elastic cushion and the thicker the elastic cushion the better its dimple suppression effect, but thick cushion leads to large error between the shape of the obtained part and its target shape. The work piece with smooth surface and small error can be achieved by the elastic cushion with appropriate thickness.

Key words: materials synthesis and processing technology, multipoint stretching, numerical simulation, dimple, elastic cushion