| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold for injection molding which can mold a rein product having an uneven part on the inner surface precisely and efficiently. SOLUTION: In the mold for molding the undercut resin product P having the uneven part Q fitted in the mold extraction direction to the inner surface p1 of a hollow part p, a male mold part 30 for forming the hollow part p is composed of a center core 1 and a main side core 2 and a sub-slide core 3 which are arranged alternately on the periphery of the center core 1, the main slide core 2 and the sub-slide core 3 have uneven outer surfaces 2c and 3c corresponding to the uneven part Q of the inner surface p1 of the resin product, the center core 1 alone retreats to form the first vacant part A1, the main slide core 2, after sliding to the center side of the first vacant part A1, retreats with the center core 1 to form the second vacant part A2, and the sub-slide core 3 slides to the center side of the second vacant part A2 to enable the injection of the resin product P.
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