Metal flow is a very inhomogeneous process during backward extrusion of complex box.It is predominant how to harmonize and to control metal rational flow at each deformation zone.

• 复杂盒形零件的挤压成形是一个极其不均匀的流动过程,如何协调和控制各变形区金属的合理流动,是其挤压成败的关键。