基于应变路径的激光拼焊板方盒件变压边力成形优化  

Forming Optimization of Variable Blank Holder Force on the Strain Path for Laser Tailor Welded Blanks Square Box

作　　者：姜银方[1] 丁新立[1] 朱元右[2] 袁国定[1] 王飞[1] 

机构地区：[1]江苏大学,镇江212013 [2]南京工程学院,南京210013

出　　处：《中国机械工程》2008年第17期2118-2121,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50475125);江苏省高等学校自然科学基金资助项目(05KJD460044)

摘　　要：采用数值模拟和实冲试验的方法,研究了不同压边力对拉深过程中破裂危险点应变路径的影响规律;通过调整压边力的大小和分布,实现对拼焊板方盒件薄板破裂危险点处应变路径的控制,从而提高拼焊板方盒件的冲压成形性。研究表明:厚/薄侧压边力的大小和分布对破裂危险点的应变路径和安全裕度有很大的影响,合理的压边力分布可调节失效破裂的位置,提高成形极限深度;变压边力条件下的应变路径由拉压应变状态过渡到双向拉伸应变状态,能够显著提高危险点的安全裕度;通过多点控制的变压边力有利于调节板料在凹模中的流动,从而能更好地控制危险点应变路径;改变危险点的应变路径,调节失效破裂的位置,可有效地提高拼焊板方盒件的冲压成形性。By simulation, the influence law on the strain path was researched in the fracture dangerous position on different blank holder force （BHF）, in the forming of tailor--welded blanks （TWBs） square box. The strain path of tailor--welded blanks（TWBs） square box was controlled in the fracture dangerous point through adjusting value, distribution and variational mode of BHF,then the formability was improved. The results mainly show that the value and distribution of BHF on thiek/thin blanks have significant influence on the forming strain path in the fracture dangerous position and the safety margin, and the proper distribution of BHF can change the fracture site and increase the forming limit depth. With the step BHF, the strain path is transferred from stretch--press strain state to double stretch state,and the safety margin is increased significantly. Variable BHF by multiple--area control is propitious to adjust sheet flowing in the die, and then the strain path of the dangerous point can be controlled better. The formability can be increased by altering the forming strain path in the dangerous position and adjusting the lurking fracture site.

关 键 词：拼焊板方盒件 应变路径 压边力 成形性 

分 类 号：TG386[金属学及工艺—金属压力加工]