| 摘要 |
PURPOSE:To position surely a core member to the mold surface of a mold core by performing injection molding through a process that a core member is sucked from a bottom surface side and held on a predetermined mold surface position of a core mold. CONSTITUTION:When vacuum pressure acts on the mold surface of the core mold 10 via a vent hole 11 after making a mold-matching of a cavity mold 20 to a core mold 10, a core member 1 is sucked on the mold surface of the core mold 10 in such a manner that the bottom surface side of the core member 1 is sucked from a striation 12a and a branch striation 12b and a seal member 15 is shifted downwards through making an expansion member 14 to be compressed and also the periphery of the core member 1 is secured by means of positioning pins 17, 18. A molten synthetic resin is injected into the inner portion of the cavity space 21 inserted with the core member 1. To inject this synthetic resin, it is injected such that the synthetic resin flows onto the upper side of the core member 1. The core member is sucked in and mounted on the core mold, so that the floating or shifting never occurs. |
