摘要
回弹是高强钢板应用面临的主要问题之一,基于NUMISHEET 96的S_Rail标准考题制作试验模具,利用伺服压机的特点来研究保压时间、保压次数、压边力大小和镦死力大小等对先进高强度钢板DP590回弹的影响。实验结果表明,通过压边力和镦死力及保压次数可以使板料在厚度方向发生挤压变形,即强压负间隙可以有效的减小回弹。最后结合数值模拟方法研究比较CAE分析的单元类型对厚向挤压变形情况下的回弹模拟影响。BT壳单元无法模拟负间隙和强压的冲压工况,实体壳单元和实体单元都可以有效模拟强压和模具负间隙的情况,且具有相同的精度,但实体单元受单元数量的限制,其计算效率相对较低。因此实体壳单元更加适合强压负间隙条件下的高强钢板冲压有限元分析。
Springback is the most common defect in the application of advanced high-strength steel （AHSS） parts. Based on the NUMISHEET 96 S_Rail benchmark,a set of experimental die ＆ mold was designed and made. Using the characteristics of servo press, the springback behavior of DP590 under different pressure holding time, holding times, blank holder force and locked force was investigated by experiment and simulation methods. The experimental results show that the blank extrusion deformation on the thickness direction under the extreme pressure conditions can reduce the springback effectively. Finally, combining the experiment and FEA methods, the effectiveness of FEM element types for extrusion deformation simulation was researched. BT shell element can not be used for extrusion deformation simulation. Solid shell and solid elements can effectively simulate the extrusion deformation and have the same accuracy, but the calculation efficiency of solid element is lower by the restriction of element number. Therefore, the solid shell element is more suitable for extreme pressure finite element analysis.
出处
《锻压技术》
CAS
CSCD
北大核心
2013年第5期50-55,共6页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(No.51275184)
中央高校基础研究基金资助项目(HUST:2012QN044)
关键词
先进高强钢板
数值模拟
回弹
单元类型
advanced high strength steels
numerical simulation
springback
element type
