Powder compacting apparatus

摘要

External helical teeth of an outer punch member of a lower punch are held in mesh with internal helical teeth of a floating die which is rotatable and floatingly supported. An upper punch is lowered toward a metal powdery material filled in a die cavity space defined by the inner circumferential surface of the floating die and the upper surface of the lower punch. The metal powdery material is compacted into a helical gear blank by the upper and lower punches while external helical teeth of an outer punch member of the upper punch are meshing with the internal helical teeth of the floating die. A presser rod extends downwardly from an upper plate which supports the upper punch forcibly lowers the floating die with respect to the lower punch in a latter period of the powder compacting process.