基于活动拉深筋过拉深工艺的高强钢S梁扭曲回弹控制研究  

Research on Twist Springback Controls of High Strength Steel Used in S-shaped Beams Based on Movable Drawbeads Overstretching Processes

作　　者：王成勇[1] 姚圆圆[1] 程明[1] 安自仁 WANG Chengyong;YAO Yuanyuan;CHENG Ming;AN Ziren(School of Materials Science and Engineering,Hefei University of Technology,Hefei,230009)

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《中国机械工程》2018年第23期2881-2886,共6页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(51275146)

摘　　要：采用CAE分析与现场调试相结合的方法,研究了高强钢变截面S梁拉延后的扭曲回弹规律,发现拐角特征是S梁发生扭曲回弹的关键影响因素。通过对拐角截面的应力和变形分析,解释了拐角造成扭曲回弹的原因,并设计了成形筋,以控制拐角造型引起的扭曲回弹。在设计成形筋的基础上,比较了变压边力和活动拉深筋过拉深两种工艺方案对S梁扭曲回弹的改善效果。研究结果表明活动拉深筋过拉深工艺对S梁扭曲回弹的改善更有效。The twist springback characteristics of high strength steel S-shaped beams with variable cross-section in stamping processes were analyzed by numerical simulations and physical tests.The results indicate that the corners play an important role in twist springback.To explore the causes of the twist springback,the stress distribution and deformation of corner sections were analyzed.The forming bead was designed to balance the nonlinearity of the corners.Based on the forming bead design,the improvement effects of the two processes of variable binder force and movable drawbeads overstretching on the S-beam torsional springback were compared.The results verify that movable drawbeads are more efficient to suppress the S-beam twist springback.

关 键 词：扭曲回弹 高强钢 变压边力 活动拉深筋过拉深 

分 类 号：TG386.3[金属学及工艺—金属压力加工]