| 摘要 |
PROBLEM TO BE SOLVED: To prevent the movement of a molded product from being moved at operation of an undercut molding core or the movement of the molded product having a high shrinkage factor in a center direction at shrinkage, in molding an molded product having an undercut. SOLUTION: In the injection molding method for molding the molded product 100 by the cavity 109 formed by clamping a fixed mold 103 and a movable mold 102 and ejecting the molded product 100 by an ejector pin 106 after mold opening to demold the same from the fixed mold 103 or the movable mold 102, a cut part 106A is formed to the leading end of the ejector pin 106 and a projection molding space 110 is formed between the leading end of the ejector pin 106 and the surface of the cavity 109 by the cut part 106A. A part of a resin is penetrated in the space 110 from the interior of the cavity 109 at the time of filling with the resin to form a surrounding rib 108A which is locked with the ejector pin 106 simultaneously with the molding of the molded product 100 to prevent the movement of the molded product 100. COPYRIGHT: (C)2005,JPO&NCIPI
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