MOLDING METHOD OF RESIN BUSHING

摘要

PURPOSE:To mold a highly reliable gas seal surface without cutting or polishing after molding by a method wherein of molds for hardening and molding resin bushings the ringed core for molding O-ring groove is provided by shape memory alloy. CONSTITUTION:When material is poured into the heated molds 6a, 6b to harden and mold the resin bushing 1 for closing the opening of a gas seal container 4 through the O-ring 3, reversible shape memory alloy is used for the ringed core 8 for molding the O-ring groove 1'. As regards this ringed core 8 used, the ring is contracted in diameter at the hardening temperature of resin and when a molded piece is taken out of the mold after hardened and coiled, the ring is enlarged in diameter and slips out of the molded piece.