针对SS304不锈钢水槽件在拉深过程中出现的零件起皱问题,采用正交试验方法研究凹模圆角半径、压边力和摩擦因数对起皱问题的影响。通过有限元分析软件Dynaform对正交试验方案进行仿真验证,考察了最大增厚率和凹模圆角半径、压边力和摩...针对SS304不锈钢水槽件在拉深过程中出现的零件起皱问题,采用正交试验方法研究凹模圆角半径、压边力和摩擦因数对起皱问题的影响。通过有限元分析软件Dynaform对正交试验方案进行仿真验证,考察了最大增厚率和凹模圆角半径、压边力和摩擦因数等3个成型影响因素之间的关系。试验结果表明,该SS304不锈钢盒型件的最佳成型工艺组合为R1C4F4,即:凹模圆角半径为5 m m,摩擦因数为0.2和压边力为50 kN。依据优化结果,改进了模具结构设计,从而较好地解决了SS304不锈钢盒型件的成型问题。展开更多
The forming limit diagram plays an important role in predicting the forming limit of sheet metals.Previous studies have shown that,the method to construct the forming limit diagram based on instability theory of the o...The forming limit diagram plays an important role in predicting the forming limit of sheet metals.Previous studies have shown that,the method to construct the forming limit diagram based on instability theory of the original shear failure criterion is efective and simple.The original shear instability criterion can accurately predict the left area of the forming limit diagram but not the right area.In this study,in order to improve the accuracy of the original shear failure criterion,a modifed shear failure criterion was proposed based on in-depth analysis of the original shear failure criterion.The detailed improvement strategies of the shear failure criterion and the complete calculation process are given.Based on the modifed shear failure criterion and diferent constitutive equations,the theoretical forming limit of TRIP780 steel and 5754O aluminum alloy sheet metals are calculated.By comparing the theoretical and experimental results,it is shown that proposed modifed shear failure criterion can predict the right area of forming limit more reasonably than the original shear failure criterion.The efect of the pre-strain and constitutive equation on the forming limits are also analyzed in depth.The modifed shear failure criterion proposed in this study provides an alternative and reliable method to predict forming limit of sheet metals.展开更多
文摘针对SS304不锈钢水槽件在拉深过程中出现的零件起皱问题,采用正交试验方法研究凹模圆角半径、压边力和摩擦因数对起皱问题的影响。通过有限元分析软件Dynaform对正交试验方案进行仿真验证,考察了最大增厚率和凹模圆角半径、压边力和摩擦因数等3个成型影响因素之间的关系。试验结果表明,该SS304不锈钢盒型件的最佳成型工艺组合为R1C4F4,即:凹模圆角半径为5 m m,摩擦因数为0.2和压边力为50 kN。依据优化结果,改进了模具结构设计,从而较好地解决了SS304不锈钢盒型件的成型问题。
基金Supported by R&D Program of Beijing Municipal Education Commission of China(Grant No.KZ200010009041)Beijing Municipal University Youth Top Talents Training Program of China(Grant No.CIT&TCD201704014)Natural Science Foundation of China(Grant No.51475003).
文摘The forming limit diagram plays an important role in predicting the forming limit of sheet metals.Previous studies have shown that,the method to construct the forming limit diagram based on instability theory of the original shear failure criterion is efective and simple.The original shear instability criterion can accurately predict the left area of the forming limit diagram but not the right area.In this study,in order to improve the accuracy of the original shear failure criterion,a modifed shear failure criterion was proposed based on in-depth analysis of the original shear failure criterion.The detailed improvement strategies of the shear failure criterion and the complete calculation process are given.Based on the modifed shear failure criterion and diferent constitutive equations,the theoretical forming limit of TRIP780 steel and 5754O aluminum alloy sheet metals are calculated.By comparing the theoretical and experimental results,it is shown that proposed modifed shear failure criterion can predict the right area of forming limit more reasonably than the original shear failure criterion.The efect of the pre-strain and constitutive equation on the forming limits are also analyzed in depth.The modifed shear failure criterion proposed in this study provides an alternative and reliable method to predict forming limit of sheet metals.
