CYLINDRICAL CORED MOLDED PRODUCT AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a cylindrical cored molded product capable of certainly preventing edge face burr by enhancing the sealability between a cylindrical core and a mold, and the cylindrical cored molded product. SOLUTION: An inner cylinder 2 is set in a mold in an erected posture and a cavity 8 is demarcated in the mold by mold clamping while the part on the central side in the axial direction of the inclined surface 26 covering the end part of the outer peripheral surface of the inner cylinder 2 is brought into contact with the mold under pressure by the annular protrusion 40 built in the mold to form a stepped part and the gap between the inner cylinder 2 and the mold is sealed on the inclined surface 26. Thereafter, a molding material is injected in the cavity 8 to fill the cavity 8 and a rubbery elastomer 4 is integrally molded in the inner cylinder 2. COPYRIGHT: (C)2008,JPO&INPIT