PURPOSE: To simplify and facilitate manufacture by a method wherein a port bearing surface is processed by means of a mandrel-shaped hole formed in an electrode plate, a die is centered by means of a machining center, and based on a center determined by the centering, finishing machining is applied on a die reference surface and a knock hole.
CONSTITUTION: A port 1 is set on the table of a diesinking electric discharge machine and a reference pin is positioned and set at the center of the reference hole of an electrode plate and processing is applied on a port bearing surface 4 by means of a mandrel-shaped reference hole formed in the electrode plate. A die 2 is centered at a machining center and based on the center, finishing machining is applied on a die reference surface 38 and a knock hole 16. Further, based on the center, a wire hole is formed in a port contact surface. The die 2 is set at a wire cut electric discharge machine and a die bearing surface 5 is machined and formed by means of a wire inserted in the wire hole. The reference pin of the port is cut for removal and a knock pin 15 is driven in a hole 39.
YAMAMURA MITSUAKI
ONO HIROYUKI
SATO MAMORU
MARUYAMA SHIGENORI
OGASAWARA SATORU
IMAI MAKOTO
