The metal flowing pattern of the tooth filling process at different stages during closed die extrusion is found through lead deformation test and double - acting extrusion method on a doubled - acting press or on a special die structure with a general press is proposed 成形试验获得了金属充填齿形腔的流动模式，提出采用专用双动压力机或在通用压力机上采用特殊模具实现坯料双向挤压的成形方法。
