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依据零件几何特征和使用性能要求,设计了镁合金超塑性成形两种模具。利用Deform-3D软件对两种成形模具在不同温度和加载速率下即温度分别为350、375、400℃和加载速率分别为10、8、6、4、2、1mm/min时进行了超塑性成形的数值模拟,揭示了温度和加载速率对所需载荷的影响规律,获得了较佳的工艺参数,获得了优化工艺参数下的速度场、等效应力场、塑性流动方向以及载荷与行程的关系,分析了成形过程中应力和载荷变化的原因。
According to the geometric characteristics of parts and the performance requirements, two kinds of molds for superplastic forming of magnesium alloy were designed. The superplasticity of the two forming molds at different temperatures and loading rates, ie 350, 375, 400 ° C and 10, 8, 6, 4, 2, 1 mm / min, respectively, The numerical simulation of the forming process reveals the influence laws of temperature and loading rate on the required load, obtains the better process parameters, obtains the velocity field, the equivalent stress field, the plastic flow direction and the load and the stroke under the optimized process parameters The relationship between stress and load during the forming process was analyzed.