抄録
The strength of a conventional hollow stem restricts the maximum circumscribed circle of an extrusion resulting in difficulty in multi-holes indirect extrusion. Development of a filler block was the first step toward the solution of this problem. A multi-holes die has been developed through calculations and practical operations in which the metal follow occurs only in the vicinity of die for indirect extrusion. This was achieved by reducing the pressurized area and extending the area of extrusion path using a filler block having high buckling strength and machinability. Such a development ensures further productivity, cost reduction of dies, and more stability in dimensional accuracy and increasing the yield of extrusion than in the direct extrusion.
