Distribution of Metal Flowing into Unloaded Area in the Local Loading Process of Titanium Alloy Rib-Web Component

摘要:

对于通过模具分区实现的等温局部加载成形，为了减少加载区对未加载区的不利影响，一般会采用筋上分区模式。由于局部加载特征，在成形过程中加载区部分材料会流向未加载区。流入未加载区材料的分配对成形过程分析、材料流动控制、成形质量改进都有着重要影响。从加载区流入为未加载区材料的分配主要由未加载区的形状和模具分区附近的几何参数所确定。若未加载区是已成形区，部分流向未加载区的材料充填分区筋型腔。应用偏最小二乘回归建立了流入分区筋型腔材料比率的预测模型。数值结果表明流向未加载区材料分配的分析和所建立的预测模型是合理的。

Abstract:

For isothermal local loading process by means of partitioned die, the partition at a rib is generally adopted in order to reduce the disadvantageous influence of loading area on unloaded area. In the local loading process, some metal (flow-into metal) in loading area flow into unloaded area due to the local loading characteristic. The distribution of the metal flowing into unloaded area plays an important role in analyzing the forming process, controlling the metal flow, and improving the forming quality. The distribution of flow-into metal coming from loading area is mainly determined by the shape of the unloaded area and the geometric parameters near the die partitioning boundary. If the unloaded area is a formed area then some of the flow-into metal will fill the cavity of partitioning rib. A predicted model for the ratio of flow-into metal distributed to cavity of partitioning rib has been established by using partial least squares regression. The numerical simulation result indicates that the analysis on distribution of flow-into metal and the predicted model are reasonable.