| 摘要 |
PURPOSE:To make easire the takeout of a molded product with undercut by using a core with pyramid-shaped face and two kinds of slide cores in contact with the pyramid-shaped face of the said core and by moving both the slide cores toward inside at the same time as the said core goes back. CONSTITUTION:After producing a molding 11 with undercut by injection, a cavity plate 15 is set bach by a certain distance from a fixed mold plate 12 and then a hexagonally conical core 17 is set back. When retreating the core 17 in relation to the cavity plate 15 which was set back and stopped, the slide core A18 and the slide core B19 move along the pyramid-shaped face of the core 17 in a projecting manner from the top of the core 17 by means of the actions of inclined pins 33 and 34 and dovetail grooves 21 and 22, 29 and 31, and 30 and 32; that is, both the slide cores 18 and 19 move toward the core center while reducing is diameter. Thus, the molded product 11 with undercut can be taken our of the mold simply.
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