The annular condition resin product which is the holder or the annular condition bond magnet which for the annular condition resin product null antifriction bearing is produced by the production method and the said production

摘要

PPROBLEM 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. PSOLUTION: 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. PCOPYRIGHT: (C)2011,JPO&INPIT