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采用简单不等厚坯料结合等温局部加载方法,低成本有效地控制大型钛合金筋板类构件成形过程中的材料流动和改善型腔充填。由于倒角过渡形式结构简单、过渡条件范围宽,因此坯料变厚区采用倒角过渡形式较好。局部加载成形过程中的过渡条件演化对坯料变厚区未约束部分的动态边界条件有显著影响。基于合理的假设,应用理论分析建立过渡条件演化模型。应用所建立模型的预测结果与实验和有限元分析结果进行比较,结果表明模型是可靠的。建立的过渡条件演化模型能够很好地处理变厚区未约束部分的动态边界,适用于对多筋构件局部加载成形中材料流动和型腔充填的快速分析。
The simple unequal thickness blank combined with isothermal partial loading method can effectively control the material flow and improve the cavity filling in the forming process of the large titanium alloy slab components with low cost and low cost. Due to the simple structure of the chamfer transition, the wide range of transition conditions, the billets thickened area with a chamfer transition is better. The evolution of the transitional condition in the process of local loading has a significant effect on the dynamic boundary conditions of the unrestrained part of the blank. Based on reasonable assumptions, the application of theoretical analysis to establish the evolutionary transition model. The predicted results of the established model are compared with the experimental and finite element analysis results. The results show that the model is reliable. The established transition condition evolution model can well handle the dynamic boundary of the unconstrained part in the thickened area and is suitable for the rapid analysis of material flow and cavity filling in the partial load forming of multi-rib components.