| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold for an annular member capable of precisely performing the centering of a core part with respect to a mold body part which constitutes the mold for injection-molding the annular member. SOLUTION: The mold for the annular member is equipped with a lower mold 7 formed with an annular recessed part 9 for molding a bead member 10 and an upper mold 8 constituted relatively movable with respect to the lower mold 7 between a mold clamping position where the annular recessed part 9 is closed to form a cavity 11 and a mold opening position where the annular recessed part 9 is opened. The upper mold 8 is composed of an annular gate 14 for injecting a material in the cavity 11, a mold body part 80 arranged at a position outer than that in the diametric direction in order to form the annular gate 14 and a core part 81 arranged at a position inner than that in the diametric direction in order to form the annular gate 14. A large number of projections 81a protruded from the outer peripheral part of the core part 81 to come into contact with inner peripheral part 80a of the mold body part 80 are arranged as a positioning mechanism for performing the centering of the center of the core part 81 with respect to the mold body part 80. COPYRIGHT: (C)2008,JPO&INPIT |
