| 摘要 |
PROBLEM TO BE SOLVED: To increase a temp. rising speed at the time of heating to shorten a molding cycle by setting the supply amt. of steam to a mold at the time of heating to a large amt. at an initial period of heating and subsequently setting the same to a supply amt. under preset steam pressure. SOLUTION: A steam piping 12 on the side of a core and a steam piping 22 on the side of a cavity are respectively connected to a core mold 10 and a cavity mold 20 and steam pressure regulating valves 13, 23, pressure regulating means 14, 24, three-way changeover valves 15, 25 and air regulators 16, 17 and 26, 27 are provided to the respective steam pipings 12, 22. At a time of an initial period of heating, the steam pressure regulating valves 13, 23 are almost fully opened by the high pressure air regulators 16, 26 to supply steam to the respective steam chambers 11, 21 on the sides of the core and the cavity from a steam source 4 to rapidly raise steam pressure. Subsequently, after a predetermined time is elapsed, the steam chambers 11, 21 are respectively changed over by the low pressure air regulators 17, 27 and steam is continuously supplied into the steam members from the steam source 4 until reaches the set steam pressure fitted to the quality demand of a molded product. |
