| 摘要 |
PURPOSE:To make change of a control system smoothly and obtain an excellent molding article by changing injection process control to keeping pressure process control when a detective injection stroke becomes above a predetermined injection stroke, besides, the absolute value of the difference between the operational panel of injection speed control and the operation ratio of pressure control becomes below a predetermined value. CONSTITUTION:At a changeover condition judging portion 9, screw position detecting value 4(z) and setting screw stroke Zset[1] are compared each other so as to obtain the absolute value of the difference between the operation panel 15(Uz) and the pressure operation ratio 16(Up). When the absolute value becomes conditions of screw position detecting value 4(z)>=setting screw stroke Zset[1], and ¦Uz-Up¦<=Uset(17), the changeover condition judging portion 9 transmits a changeover signal to a control loop changeover portion 10 so as to change a contact A to a contact B. Namely, the contact relation is changed over from (A-C) to (B-C). As a result, the pressure operation panel 16(Up) is inputted to a servo-amplifier 11, an injection molding machine 12 (that is, a servo-valve 28) is controlled through the pressure operation panel 16(Up). Namely, it is continuously changed over from the speed control loop to the keeping pressure loop. |
