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以正反向超塑成形厚度均匀的TC4钛合金深筒形件为背景(厚度精度要求1.6mm±0.2mm),设计了多种预成形模形状,采用MSC.MARC有限元模拟研究了不同形状的预成形模对深筒形件侧壁厚度分布的影响,并分析了预成形模和终成形模的表面摩擦系数分别对成形件壁厚分布的影响,提出了模具型面变摩擦控制厚度分布的方法。结果表明:预成形模对压边部分环形带区域和筒形件底部区域的局部预减薄,对最终侧壁的厚度分布有非常大的改善。同时,合理地增大预成形模的表面摩擦能显著增加预成形的局部减薄作用,对于提高工件最终壁厚分布均匀性有利。减小终成形模的摩擦,可以使板料整体变形均匀化,壁厚分布趋于均匀。根据有限元分析结果,对模具表面进行处理,并通过正反向超塑成形实验制得TC4钛合金深筒形件,其厚度分布满足1.6mm±0.2mm。
Based on the TC4 titanium alloy deep cylindrical part with uniform thickness in forward and reverse superplastic forming (the thickness precision is 1.6mm ± 0.2mm), a variety of preform shapes are designed. The different shape The influence of the surface friction coefficient of the preforming mold and the final forming mold on the wall thickness distribution of the shaped part was analyzed respectively. Distribution method. The results show that the preform thinning locally pre-thinning the bead area in the blank holder and the bottom area of the barrel has a very great improvement on the thickness distribution of the final sidewall. At the same time, increasing the surface friction of the preforming mold reasonably can increase the local thinning effect of preforming, which is beneficial to improve the final thickness distribution uniformity of the workpiece. Reducing the friction of the final forming die can make the whole deformation of the sheet uniform and the distribution of the wall thickness tends to be uniform. According to the results of finite element analysis, the mold surface was treated, and the TC4 titanium alloy deep cylindrical part was obtained through the forward and reverse superplastic forming experiments, the thickness distribution of the TC4 titanium alloy satisfies the thickness of 1.6mm ± 0.2mm.