| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of a damage in a molded product caused by the edge of a movable mold accompanied by the shrinkage of a resin at the time of molding of the molded product having a recessed part in its peripheral wall and having a bead edge formed to the side end surface of its opening. SOLUTION: The injection mold 1 is constituted of a fixed mold 2, the movable mold 3 capable of being clamped and opened with respect to the fixed mold 2, and the movable core 4 provided to the fixed mold 2 and energized so as to be moved in the moving direction of the movable mold 3 through an elastomer 5. A recessed part 2a on an inner peripheral side corresponding to the half of the bead edge Sb is formed to the fixed mold 2 while a recessed part 4a on an outer peripheral side corresponding to the half of the bead edge Sb is formed to the movable core 4, and the recessed part corresponding to the bead edge Sb is formed by these recessed parts 2a and 4a on the inner and outer peripheral sides. A molten resin is injected in the cavity formed by the fixed mold 2, the movable mold 3 and the movable core 4 to fill the cavity to be cooled and solidified. When the movable mold 3 is opened in this state, the movable core 4 is moved by the elastomer 4 so as to follow the movable mold 3, and the outer peripheral side of the bead edge Sb of a shrunk recessed part (x) is supported by the recessed part 4a on the outer peripheral side of the movable core 4.
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