B550CL高强钢轮辐反拉深-翻边复合成形损伤开裂研究

Research about flange cracking in the high-strength steel spokes forming process

针对高强钢汽车轮辐在实际生产过程中经常出现反拉深-翻边复合工序中中心孔翻边开裂这一问题,采用有限元数值模拟的方法,建立了有限元模型,并通过试制轮辐验证其可靠性.模拟获得了新型高强钢材料B550CL在用于轮辐翻边成形时的应力应变的分布和变化规律,并进一步对轮辐的损伤和壁厚分布情况进行了分析.研究表明:反拉深-翻边复合工序中翻边区在成形过程中应力应变集中明显,变形量较大;同时,材料的损伤和壁厚减薄在翻边区域也比较严重,导致实际成形中翻边区可能出现开裂等缺陷.

With the increasing demand of safety performance, lightweight and energy saving in the automotive industry, low cost hot?rolled high?strength steel parts have been widely used in the automotive wheel manufacturing . In order to tackle the cracking problem occurring in the center hole during the coupled reverse?drawing and flanging process, finite element simulation was carried out. The distribution and variation of the stress and strain when forming the B550CL high?strength steel was calculated and validated by experimental results. The results showed that the stress and strain concentrates severely in the flange area during the coupled forming process, and the deformation of this area is larger than the rest of the part.The damage and thickness reduction in the flanging region is relatively more serious, which may cause defects such as cracking in actual production.