Injection molding machine and controlling method therefor
A technology of injection molding machine and control method, which is applied in the direction of program control, general control system, control/regulation system, etc., and can solve problems such as incomplete closing of molds, poor forming, and opening
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no. 1 Embodiment approach
[0020] figure 1 It is a block diagram showing an example of the configuration of the injection molding machine 1 according to the first embodiment. The injection molding machine 1 is a machine capable of repeatedly performing a series of injection molding operations, for example, the operation of molding a molded product once is repeated as a cycle operation. The time for executing a series of periodic operations is called cycle time.
[0021] The injection molding machine 1 includes a frame 2, a fixed plate 3, a movable plate 4, tie rods 5, a mold clamping drive mechanism 6, an injection device 7, a control unit 8, an ejection mechanism 9, a man-machine interface 60, a storage unit 110, and an injection pressure sensor. S1, screw position sensor S2, tie rod sensor S3.
[0022] The frame 2 is the base of the injection molding machine 1 . The fixed disk 3 is fixed on the frame 2 . A fixed mold 11 as a second mold is attached to the fixed platen 3 . One end of the tie rod 5...
Deformed example 1
[0074] Figure 6 It is a schematic diagram showing an example of selection of molding conditions in Modification 1. Modification 1 of the first embodiment differs from the first embodiment in that the molding conditions are selected using the maximum value of the peak value of the mold opening amount in the holding step or the cooling step.
[0075] Figure 6 In , near the boundary line between the region A and the region B, the maximum value of the mold opening amount is approximately 0 mm. However, the closer the molding conditions are to the region C, the larger the maximum value of the mold opening amount becomes. Therefore, the control unit 8 may control the mold clamping force and the holding pressure such that the maximum value of the mold opening amount per molding cycle is substantially constant. also, Figure 6 Step St2 of the same as in the first embodiment Figure 4 The conditions for the determination of step St2 (St5, St8) are different. In addition, other ...
Deformed example 2
[0084] Figure 8It is a graph showing an example of the time change of the mold opening amount in one molding cycle of Modification 2. Modification 2 of the first embodiment differs from the first embodiment in that the amount of mold opening in the filling step (t1 to t2) is used as an end condition for selection of molding conditions. A dotted line L21 indicates the mold opening amount when the end condition is not satisfied. A solid line L22 represents the mold opening amount when the end condition is satisfied.
[0085] The in-mold pressure rises from the start (t1) of the filling process, and rapidly rises near the completion of filling. As described in the first embodiment, the injection pressure is not changed from the standard molding setting. Therefore, the initial mold clamping force selected under the condition is sufficiently high, so as shown in L21, the mold opening amount in the filling process (t1~t2) is approximately 0mm. However, if the mold clamping forc...
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