SU1669743A1 - Method of automatic control of mold closing force - Google Patents

Abstract

The invention relates to the automation of plastics processing and can be used in injection molding machines for plastics. The aim of the invention is to increase the productivity of the injection molding machine by reducing set-up time and adjusting the locking forces and eliminating the operation of the machine in a defective mode. To do this, in the method of automatic control of the force of locking the form in the lever closing mechanisms, including the measurement of the locking force and when the measured value does not correspond to the specified performance of the displacement of the support element and the movement of the lever system, set the amount of movement of the movable plate to the closing of the form, and in each cycle during the spreading the system at the time of the closure of the form, direct or indirect measurement of the displacement of the movable plate is carried out and if the measured value does not correspond to the given value TERM is produced so on folding or a flattened lever system and moving the support member on the correction value to produce a full torque forces and injection locking in a given cycle. 5 il.

Description

This invention relates to the automation of plastics processing and can be used in injection molding machines for plastics.

The purpose of the invention is to increase the productivity of the injection molding machine by reducing the setup time and adjusting the zapirani gain and eliminating the operation of the machine in a defective cycle.

Fig. 1 shows a block diagram of an automatic force control device for locking the molds; Fig. 2 is a diagram of the movement of the support member and the lever system when performing automatic adjustment of the locking force; Fig. 3 is a diagram of the installation of sensors for direct measurement of the movement of a movable plate; in fig. 4 and 5 are diagrams for installing sensors for indirect measurement of the movement of a movable plate. A method for automatically adjusting the force of locking the molds in the lever mechanisms of injection molding machines consists of the following operations. The amount of movement of the movable plate to the closure of the form 5z is set. From the initial position (Fig. 2a), the lever system is straightened, the current position of the movable plate Si is measured. At the time of the closure of the form, the value of Si is measured, compared with the predetermined 5h. If Si 3h (Fig. 36i) makes a simultaneous supply of the support element

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(.), a new setpoint value of 5f fi when distributing the lever system (S, 5t bgk 10 onset of heat) v v (on the railroad sleepers for glare 14 and 15 ifi ui is controlled by cylinder 5 and actuator b (1 i orchchi IPMCHT 4 re

is shifted back and lever system 3 is spread out. The signal from the plowing sensor 8 goes to the computing device unit 10 and, according to the unit, the computing device unit 10 provides signals to the control units 14 and 15, which stop the cylinder 5 and the actuator 6.

If, during the expansion of the lever system 3Si 5z, a similar process is carried out, but the supporting element 4 moves forward and the lever system 3 is folded. The cylinder 5 and the actuator 6 are stopped in a similar manner at 5d5z.

When, during the overlay process, the signal from the sensor 7 of the locking force is not supplied to the computing device unit 10, and the movable plate 2 is moved to the full stroke, i.e. Zmax, then all operations are performed as under the condition of Si 5h.

The magnitude of the specified movement of the movable plate 5z at the initial moment can be calculated from the known dependencies or determined experimentally.

For direct measurement of the movement of the movable plate 2, the displacement sensor 8 directly measures the linear displacement of the plate 2 itself. The displacement sensor 8 is mounted on the base of the locking mechanism or on the plate 2 itself (FIG. 3).

The indirect measurement of the amount of movement of the movable plate 2 can be carried out by the movement of the cylinder 5 of the lever system 3.

FIG. 4 and 5 illustrate the installation of sensors for indirect measurement of the movement of the movable plate 2. The sensor 16 measures the linear movement of the cylinder rod.

5. The sensor 17 measures the conditional paving of the lever connected to the supporting element 2, and the sensor 18 measures the angular displacements of the lever connected to the movable plate 2.

The conversion of the measured displacements and the displacement of the movable plate 2 is carried out according to known dependencies and can be controlled experimentally.

The invention makes it possible to increase the productivity of the injection molding machine, as well as to exclude the operator’s participation in adjustment operations and to improve the adjustment accuracy.

Claims (1)

Claims The method of automatically adjusting the force of the shape in the lever mechanisms of the closing of injection molding machines includes measuring the locking force and, if the measured value does not match, the specified movement of the support element and the movement of the lever system is different from that. in order to increase the productivity of the injection molding machine and to exclude the operation of the machine in the defective mode, the movement amount of the movable plate is set, and in each cycle, when the lever system is released, the movement of the movable plate is measured directly or indirectly at the moment the mold closes at the same time, the lever system is folded or unfolded and the support element is displaced by the correction value until a full locking force is created and injection into this cycle. U, 5 3 fig 1 fig.Z