| 摘要 |
PROBLEM TO BE SOLVED: To enable, in a molding apparatus 10 for a hollow molding body, the supply and discharge of the air and liquid in the hollow part of the core to be done efficiently. SOLUTION: A core 27, which is expansive so as to form a hollow part 25, is provided with one opening 27c that communicates with the hollow part 25. Into the opening 27c an air pipe 21 through which the air passes and a liquid pipe through which a machine oil (liquid, pressurized fluid) passes are inserted so that the tips 21a, 23a may face on the hollow part 25. The extension length L1 of the air pipe 21 from the opening 27c to the inside of the hollow part 25 is set to be longer than the extension length L2 of the liquid pipe 23. In the state that the core 27 is wound with a resin-made sheet material 35 on its outside surface and arranged in the molding die 1, by introducing by a controlling apparatus the machine oil into the inside of the core 27 through the liquid pipe 23 to pressurize and expand it, the sheet material 35 is pressed against the first and second molding faces 3a, 5a of the molding die 1 to form the hollow molding body 7 made of the resin. COPYRIGHT: (C)2008,JPO&INPIT |
