| 摘要 |
PURPOSE:To certainly release all products from a mold by one ejection, by using a mold having such a simple structure that an ejector pin is moved after molten plastic is injected into a cavity to thrust the center part of the bottom surface of each product. CONSTITUTION:A fixed mold 12 forms the upper surface of a flange, the inner surface of a peripheral side wall and the upper surface of a bottom wall while a movable mold 13 forms the under surface of the flange, the outer surface of the peripheral side wall including an undercut and the lower surface of the bottom wall containing a center part and the position of an ejector pin 14 is set to the center part of the bottom wall. When the movable mold is moved after resin is injected into the cavity formed by clamping the fixed mold and the movable mold from a gate port G, a molded product is hooked with the undercut and certainly pulled by the movable mold. In the next step, when the center part of the molded product is thrushed by the ejector pin 14, the product is lifted at the center of the bottom wall thereof while the peripheral side wall is inwardly pulled to be separated from the inner peripheral surface of the lower mold and the undercut 4 is detached from the ring shaped inner peripheral expanded part 13a of the movable mold to release the product from the movable mold. |
