| 摘要 |
PURPOSE:To mold with a stable quality and a high productivity by a method wherein resin is injected by opening a gate under the condition that a mold is mechanically fixed at the predetermined opened position of the mold and, after the completion of the injection, the gate is closed and the resin is compressed in parallel and, at or after the completion of the compression, the gate is opened and resin is injected and, after the injection of resin by proper amount, the gate is closed and the injection is stopped. CONSTITUTION:Resin is injected by the predetermined amount so as to be filled in a cavity by sliding a screw 111 in order to realize the initially set injection speed and pressure of the melted and metered resin in an injection mechanism 110 through the controlling of the hydraulic pressure and amount of an injection cylinder 113 by means of a controlling section 140. When the resin is injected by the predetermined amount, a signal is sent from a screw position detecting device to the controlling section 140, which sends a resin compression starting command signal to a solenoid valve 160 upon the receipt of said signal so as to compress the resin in a mold through the sending of oil pressure from a pump 15 to a compression cylinder 4. When the filling of the resin by the amount proper for a product in the mold cavity is detected by the screw position detecting device during the forming compression, the controlling section 140 receives the detection signal, resulting in actuating a servo motor 141 so as to close the valve 122 of a gate opening and closing mechanism 120. |
