The thickness varies according to the half-apex angle, and the forming limit half-apex angle is the key which NC incremental sheet metal parts forming process succeeds, it relates to the material and thickness of the sheet metal.

• 变形区厚度的变化与成形半顶角有关，其中，成形极限半顶角是数控渐进成形能否成功的关键，它不仅与材料有关，而且与板料厚度有关。