PURPOSE: To obtain parts high in precision and excellent in productivity by giving torsional torque to a member by synchronizaing the speed of the member extruded from a molding die with an extruding speed in a method of inserting a material to be worked into an extrusion molding die for extrusion molding.
CONSTITUTION: A shape to mold a fine gear or a fan, etc., is molded on a die 2. Wire electric discharge machining or wet etching is preferred to be used as a method to work an arbitrary shape on the die. The material 1 to be worked is inserted into a container 3 fixed with a die 2, a ram 4 is advanced at a fixed speed to extrude the material 1 to be worked. At this time, when the torsional torque is given to the member extruded by synchronizing its speed with the extruding speed, the straight extruded member can be molded into the shape of a screw. In this way, it is easy to mold the member into the shape of either a screw or a a straight line and the torsional pitch can be selected freely in the shape of the screw.
YOSHITOMI YUJI
HARADA TAKESHI
SATO KAZUO
KONO AKIOMI
