MOLD FOR INJECTION MOLDING ANNULAR RESIN PRODUCT, METHOD OF MANUFACTURING ANNULAR RESIN PRODUCT, AND ANNULAR RESIN PRODUCT MANUFACTURED BY THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a mold for injection molding an annular resin product and a manufacturing method which can improve a material yield compared to a disc gate type injection molding while making weld-less molding possible.;SOLUTION: A cavity for the product for molding a retainer 1 for a rolling bearing to be the annular resin product and a cavity for a dummy body for molding an inside dummy body 2A which is linked to the inner wall whole circumference of the retainer 1 for the rolling bearing and extends to the inside are formed on the mold 3 for injection molding, a hot runner 8 is connected to the cavity for the dummy body, and the shape and the size of the cavity for the dummy body are defined so that a molten resin P passing through the hot runner 8 and the cavity for the dummy body may be almost simultaneously filled from the inner wall whole circumference of the retainer 1 for the rolling bearing into the cavity for the product.;COPYRIGHT: (C)2011,JPO&INPIT