| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an injection molding capable of manufacturing the injection molding with a shape closer to a designed value even while suppressing prolongation of a cooling period. <P>SOLUTION: The method has a resin injecting step P2 of injecting thermoplastic resin in a molten state into a cavity formed by a first mold and a second mold in a clamped state, a pressed gas injecting step P3 of injecting pressed gas into the cavity, for forming a hollow part in the thermoplastic resin by the pressed gas, thereafter for bursting the thermoplastic resin, and for communicating a passage contacted to the cavity and the hollow part, a pressure maintaining step P4 of stopping the injection of the pressed gas before a predetermined period passes from the time point when the thermoplastic resin is bursted and for standing by the injection of a cooling medium with the passage closed until the above period passes, and a cooling step P6 of making the cooling medium go through the hollow part with the passage opened after the above period passes. <P>COPYRIGHT: (C)2013,JPO&INPIT |
