柔性压边和刚性压边技术在薄板类件多点成形中的对比分析  

Analysis on Flexible and Rigid Blank-holders Technology Applying on Thin Sheet Metal in Multi-point Forming

作　　者：孙刚[1] 李明哲[1] 邓玉山[1] 李湘吉[1] 

机构地区：[1]吉林大学辊锻工艺研究所,长春130025

出　　处：《机械工程学报》2008年第5期147-151,共5页Journal of Mechanical Engineering

基　　金：国家自然科学基金(50605028);欧盟第六框架STREP项目DATAFORM(AST5-CT-2006-030877);吉林大学985工程汽车工程科技创新平台资助项目。

摘　　要：对比分析刚性压边和柔性压边两种不同工艺,探讨不同的成形工艺条件对起皱模拟、破裂以及成形极限的影响。用显式动力学商用软件LS-DYNA对两种厚度的马鞍型曲面件进行数值模拟。模拟结果表明,在刚性压边成形方式下,变形量较大时成形件起皱,压边力较大时成形件破裂;但在相同条件下,用柔性压边成形工艺的成形件结果良好,而且减小压边面的宽度到原来的1/2时,通过增加压边力的方法,还可获得良好的成形效果。柔性压边工艺可大大提高板料的利用率,改善板料的成形极限,减少各种不良缺陷发生。Different technologies about rigid blank-holder forming and flexible blank-holder forming are simulated, and the influence on wrinkle, crack and forming limit from the two different technologies is also analyzed. Furthermore this process is numerically simulated by explicit software LS-DYNA for U-shaped parts with two kinds of thickness. The results show that in the rigid blank-holder forming, the formed part will wrinkle when the deformation is great, and will rupture when the blank-holder force is great. But under the same condition, by using the flexible blank-holder forming technology, the formed part is good, moreover, when the width of blank-holder surface is reduced to 1/2 of the original one. Good forming result can be obtained by increasing the blank-holder force. The flexible blank-holding technology can greatly increase the utilization efficiency of sheet metal, improve the forming limit sheet metal, and avoid various defects.

关 键 词：多点成形 数值模拟 刚性压边 柔性压边 成形极限 板料 

分 类 号：TG386.3[金属学及工艺—金属压力加工]