METHOD FOR MANUFACTURING CENTRIFUGAL FAN, MOLD FOR INJECTION-MOLDING CENTRIFUGAL FAN, AND CENTRIFUGAL FAN

摘要

PROBLEM TO BE SOLVED: To prevent the catching of a molding by a gate mold and the breakage of the molding by making the molding surely follow a protruding mold.;SOLUTION: A mold for injection-molding a centrifugal fan has a gate mold and a protruding mold, is fitted with a thickness reducing piece, and molds a hollow blade. A reverse gradient is formed in the hollow blade peripheral molding surface of the protruding mold so that the hollow blade is left in the protruding mold when a mold is opened.;COPYRIGHT: (C)2004,JPO