| 摘要 |
PURPOSE:To control injecting speed at a high accuracy, provided viscosity of casting material varies, by controlling the operating pressure of a cylinder for extruding materials by means of variation in pressure at the time of injection. CONSTITUTION:A pressure sensor 10 is installed on a piston 6, while a detecting section 11 detecting pressure and a pressure regulating valve 12 varying its pressure by a pressure from a piston section are installed on a cylinder 7 for extruding materials. By stretching the cylinder 7 and lowering a piston 6, casting materials are removed out of a material tank 5, which are injected into a molding section 1a by way of a material supply hose 4, an injection nozzle 2 and a runner 1b. At that time, injection pressure is measured by the pressure sensor 10 installed on the piston 6, and in case the pressure is more than the fixed pressure, a pressure rise is detected by the detecting section 11. The pressure regulating valve 12 is operated by the detecting signals and operating pressure of the cylinder 7 for extruding materials. |
