关键词: 板料无模成形, 点支撑成形, 渐进成形, 金属板料成形, 快速原型制造技术, 失稳

Abstract: One new method of the sheet metal dieless forming is creatively proposes —— the point bolster dieless forming, which adopts point rod as bolster instead of the conventional model bolster. This method gets rid of the constraint of the mould and realizes the real dieless forming. In this new forming method, cone is the critical shape. Such protuberant shape as parabolic shell tends to instability, as well cone and hyperboloid is stable. However, the instability can be effectively overcome if technologic projects are implemented according to the influence factors.

Key words: Incremental forming, Instability, Point bolster forming, Rapid prototyping, Sheet metal dieless forming, Sheet metal plastic forming