| 摘要 |
PROBLEM TO BE SOLVED: To form a molded object with an undercut part by injection molding. SOLUTION: This injection mold has a fixed mold 2 for forming the outer surface side of the molded object 1 and a movable mold 3 which enables a mold opening/clamping action to be performed to the fixed mold 2 by moving back and forth in the mold opening/clamping direction and forms the inner surface side of the molded object 1. The movable mold 3 comprises a core 4 having a gradient surface 4a which is opposed to the inner surface of a side wall where an undercut part 1a is formed and inclined so as to approach the inner surface of the side wall from the advancing side edge to the receding side edge and a groove part 4b in parallel with the mold opening/clamping direction; a slide mold 5 which is installed in a forward/backward movable manner along the gradient surface 4a of the core 4; and an insert 6 which is installed through the slide mold 5 in the way that it freely moves in a perpendicular direction with the mold opening/clamping direction and has its tip part projected from the slide mold 5 during its advancing by fitting the rear edge part into the groove part 4b in a freely movable fashion. COPYRIGHT: (C)2004,JPO&NCIPI
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