| 摘要 |
PURPOSE:To prevent a wire deformation or poor shot of resin, by providing an encapsulating mold embedded with a pressure sensor and a servovalve controlling a speed and pressure of a plunger by output of the sensor. CONSTITUTION:A signal is entered into a pressure detector 9 from a pressure sensor 11 buried into the inside of a mold and resin is kept pressurizing while a pressure curve is being displayed as per a sketch during encapsulating process. Then a position detecting sensor 3 of a linear scale connected with a plunger 2 is fixed to the plunger 2. A position of the plunger 2 displayed by the position- detecting sensor 3 is sent to a control part 8 moment by moment from a position detector 4, through which a speed of the plunger is calculated by measuring a period within the control part 8. The control part 8 is controlling a throttle quantity of a valve and pressure of a hydraulic servovalve 6 driving the plunger and controls a speed and the pressure of the plunger based on a signal of the control part 8. Lowering pressure of the plunger is measured by a pressure gauge 5, feed back of a value of which is applied to the control part 8 and corrective control of the servovalve 6 is performed. |
