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采用机械划线法制作网格,利用通用板料成形性能试验机和网格拓印测量的方法,获得了TA1纯钛板在不同应变路径下的极限应变值,以此数据为基础绘制了TA1纯钛板室温下的成形极限图,并基于最小二乘法对成形极限图进行拟合建立了成形极限图的预测模型。此外,将成形极限预测模型导入到有限元模拟软件中,作为成形破裂的判据,对TA1纯钛板胀形成形的破裂缺陷进行预测,并通过工艺试验对预测结果进行了验证。对比结果表明,采用成形极限预测模型作为破裂判据的有限元数值模拟能够较为精确的预测出TA1纯钛板的极限胀形高度和胀形发生破裂的部位。
The grids were made by mechanical scribing method. The ultimate strain values of TA1 pure titanium plate under different strain paths were obtained by the universal sheet forming performance testing machine and the method of grid print measurement. Based on this data, TA1 Pure titanium plate at room temperature forming limit map, and based on the least square method to fit the forming limit map to establish the forming limit map prediction model. In addition, the forming limit prediction model was imported into the finite element simulation software as a criterion for forming fracturing to predict the rupture defects of TA1 pure titanium plate bulging, and the prediction results were verified through the process test. The comparison results show that the finite element numerical simulation using the forming limit prediction model as the rupture criterion can predict the critical bulging height of the TA1 pure titanium plate and the site of rupture of the bulging shape more accurately.