| 摘要 |
PROBLEM TO BE SOLVED: To easily mold a molded article with a through-hole by a method wherein a pin for forming the through-hole in the molded article is pushed by means of a spring from one mold side to the cavity side of another mold and injection and compression is performed. SOLUTION: A movable plate of an injection molding machine is moved and a mold 5 on the movable side is moved to a mold 1 of the fixed side. As a pin 8 is projected from a projected part 6a of a core mold 6 by means of a spring 10, at first, the apex of the pin 8 is brought into contact with the cavity face of a cavity mold 3. Mold clamping is performed so as to make the gap between the cavity mold 3 and the core mold 6 to be a mergin A for compression or a mergin A+αfor compression and then, the movable mold 5 is stopped. At this mold closing stopping position T, a resin is injected into the cavity and then, the mold is clamped again. Then, even when the resin is injected into the cavity at the mold closing stopping position T, as the apex of the pin 8 is pushed on the cavity face of the cavity mold 3, it is possible to prevent the resin from penetrating into the bottom part of a through-hole 67 of a molded article 68.
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