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通过采用DYNAFORM软件进行数值模拟试验,确定出在定常压边力曲线控制下矩形件拉深成形压边力变化安全区的取值范围,然后根据该试验结果以及相关资料,选取出12种典型变压边力控制曲线进一步进行数值模拟。变压边力数值模拟试验结果表明,采用变压边力控制矩形件拉深成形过程时,变压边力对矩形件拉深成形特性影响显著。对试验所获得的矩形件最大增厚量和最大减薄量进行数据分析,变压边力对最大减薄量的影响较对最大增厚量的影响更为显著。根据试验结果比较所选取的12种典型变压边力控制曲线可知,改善矩形件拉深成形性能最优的变压边力曲线为曲线L,最差的变压边力曲线为曲线I。最后,分别采用曲线L,曲线I以及定常曲线A进行物理模拟试验,以验证数值模拟的试验结果。物理模拟试验结果表明,其最大减薄量的试验结果与数值模拟所获得的试验结果十分吻合。因此,通过数值模拟可以有效地进行变压边力曲线的预测和控制研究。
By using the numerical simulation of DYNAFORM software to determine the blank area under the constant blank holder force curve forming blank holder force changes in the safety margin of the range of values, and then based on the test results and relevant information, select 12 typical Variable BHF control curve for further numerical simulation. The results of numerical simulation of blank holder force show that when blank holder is controlled by blank holder force, the influence of blank holder force on the former is significant. The data of the maximum thickening and the maximum thinning of the rectangular pieces obtained by the test are analyzed. The influence of the variable blank holding force on the maximum thinning is more significant than the maximum thickening. According to the test results, the control curves of the 12 typical strains are obtained. It can be seen that the curves of the deformation BHF with the best performance of forming the rectangular part are curve L, and the curve of the worst deformation BHF is the curve I. Finally, the physical simulation test is carried out by using curve L, curve I and stationary curve A respectively to verify the numerical simulation results. Physical simulation results show that the maximum reduction of the test results and numerical simulation results obtained are in good agreement. Therefore, the numerical simulation can effectively predict and control the pressure side force curve.