| 摘要 |
PURPOSE:To mold a molding without burrs with automatic measuring, by controlling the displacement of the parting face of a mold and the plasticizing measuring position of a screw by means of a specific sensor set on the mold. CONSTITUTION:A detecting device 8 with a displacement sensor is set on a mold 7 to detect the displacement 8 of parting faces of molds 6 and 7. deltaD is a displacement of the parting face in a state where no clamping force is applied just after the molds 6 and 7 are closed. By clamping the mold (a), the displacement of the parting face decreases and reaches the min. value deltaE. Then, a resin pressure in a molding cavity 20 acts to open the molds 6 and 7 in the injection filling period (f) and the displacement of the parting face thereby begins to increase and reaches a displacement deltaC. At this point, it is switched to the injection dwelling period (h), where a servo valve 38 is worked to make the displacement of the parting face to be constant value deltaS and an injection is controlled. The parting face does not thereby open and no burr occurs. |
