因空心枝形件形状所致,其挤压成形无法采用上模插入下模的闭式锻模结构。本文论述了空心枝形件闭式挤压工艺,给出了空心枝形件闭式挤压新型模具结构和设计要点。该模具采用楔块锁紧上凹模与下凹模对合结构,锻件在两个凹模和两个凸模形成的封闭模腔中挤压成形,生产的锻件无飞边。 Due to the shape of the hollow branches, the extrusion can not use the upper die inserted into the closed die forging structure. In this paper, the closed extrusion process of the Hollow Branch is discussed. The structure and design points of the new type of Hollow Branch with closed extrusion are given. The die adopts a wedge locking upper die and a lower die matching structure. The forging is extruded in the closed cavity formed by two concave dies and two convex dies, and the forgings produced have no flash edges.