以前,卡环、金属垫等环状零件大都由板材冲裁而成,废料较多。本文介绍的面内弯曲成形法能有效地利用材料,并能扩大到型材的弯曲成形。面内弯曲成形法大致分为两种:由面内弯曲负荷或滚压造成的面内弯曲成形及由压延产生弯 Previously, ring rings, metal mats and other ring-shaped parts are mostly blanked by the plate, waste more. This article describes the in-plane bending method can effectively use the material, and can be extended to the bending of the profile. In-plane bending forming method can be roughly divided into two kinds: in-plane bending caused by bending load or rolling in-plane bending and bending by rolling