| 摘要 |
PURPOSE:To sturdily form the desired recessed portions, etc. in the course of forming by uniformly heating the whole metal mold and keeping it hot through such an arrangement wherein hot air current is locally introduced into recessed and grooved portions, etc. of the metal mold corresponding to narrow and small recessed portions, etc. CONSTITUTION:A desired raw material of powdered resin is stuffed in both metal molds 19, 19 and a gas burner 13b is caused to burn until the temperature inside the heating environment 13 reaches a desired temperature. Next, the left and right cylindrical rotary frames 16, 16 are caused to rotate, and at the same time, a base unit 14 is caused to tilt to the left and right around a pivotal shaft 26. The raw material in the metal mold 19 melts and moves and a hollow structure of uniform plate thickness is formed. Since air inside recessed and grooved portions 22, 23 of the metal mold 19 is sucked outside through a connecting pipe 25 and a central shaft 17 by sucking action, adequately heated air flows in and molten resin is caused to effectively adhere to the internal surface of the recessed and grooved portions 22, 23. After a fixed period of heating and forming operation by rotary action, heating is stopped and the mold is cooled and its rotation is stopped, and the metal mold 19 is divided into an upper and lower portions and a hollow formed product is obtained. |
