| 摘要 |
PURPOSE:To make servo-control of a flow and pressure of hydraulic oil to be supplied to a cylinder for driving of a metal mold according to a deflection between a predetermined signal from a selected setting up device of a position of the metal mold and a position signal to be fed back from the setting up device, by a method wherein a selected signal is applied to a change-over selector from a control board through action of a hollow molding machine. CONSTITUTION:When a selected signal is applied to a change-over selector 3 from a control board 2 through action of a hollow molding machine, a selected device, for example, a setting up device 1C of a precovering position of a metal mold applies a predetermined signal for moving the metal mold to a predetermined position to a subtracter 5 through the change-over selector 3. Simultancously with the above matter feedback of a position signal showing an actual position of the metal die is made directly from a mold position detector 4 to the subtracter 5. The subtracter 5 applies a deviation between both to a servo- control system 7. The servo-control system 7 controls a flow and pressure of hydraulic oil to be supplied to a cylinder for driving of the metal mold by its constitutents 7A-7D so as to make the deviation into zero. |
