| 摘要 |
PROBLEM TO BE SOLVED: To alleviate an ejection force by rotation by quenching a mold in opening the mold or releasing a molding from the mold by reducing a releasing resistance when the molding is released from the mold while rotating. SOLUTION: A cooling water hole 10 of a mechanism for passing cooling water is provided in a mold 3 for forming a cavity. Prior to the molding (charging resin), the mold 3 is closed, and simultaneously the molds 1, 2 are heated by a heater 9. Molding is started when it arrives at a predetermined temperature (e.g. 160 deg.C). Curing is finished, and then the mold is opened. Simultaneously, a heater 9 is deenergized, cooling water is passed through the hole 10 to start cooling. When it becomes a predetermined temperature (e.g. 120 deg.C) or lower, the molding is released, and removed. Thus, a difference of thermal expansions of the mold 2 of the metal cooled and the molding of the resin is utilized to generate a gap at an interface between the mold 2 and the molding, and the molding is easily released while rotating the molding. |
