| 摘要 |
PURPOSE:To provide an inexpensive high-precision device through extremely simple constitution, by a method wherein heat energy is stored in a heat accumulation part and a gate part is heated locally by feeding the heat energy to a heating space formed on the gate part by a pressurizing device such as a piston through a heat flow path. CONSTITUTION:As a heat accumulation part 21 and cylindrical hollow chamber have been formed on a manifold 5, air in the said part 21 is heated by a heater 6 of a manifold 5 and the temperature is raised. When molten raw material resin is injected by an injection molding device 2 under that condition, the inside of a cavity 8 is filled with the molten resin of a desired quantity on the inside of a sprue 3 on the inside of a mold 4 through a runner part 11 and gate part 12. At the time of injection operation, when a pressurizing device 24 is actuated, and stroke motion of a piston 22 is developed through a control device 23 such as an air cylinder based in the heated air in the inside of the heat accumulation part 21, the heated air corresponding to a quantity of the stroke arrives at a heated space H of a gate part 12 by passing through a heat flow path 25, the space H is heated, and the raw material resin on the inside of the gate part 12 is molten through heating. |
