JPH0813492B2 - Injection molding machine control method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine control method and apparatus.

[0002]

2. Description of the Related Art In an injection molding machine, if a product, runner, etc. does not drop even if ejected, it remains in the mold or foreign matter adheres to the parting surface of the mold, forcibly forcibly clamping the mold. Since there is a risk of damaging the expensive mold, it is detected whether or not foreign matter is attached to the mold before the next cycle after the completion of molding. There are various methods for detecting foreign matter, but in general, the mold closing is changed from the high-speed mold closing to the low-speed low-pressure mold closing to detect the state where the foreign matter is sandwiched between the mold surfaces. Is detected,
The injection molding machine is temporarily stopped to ensure mold safety.

[0003]

In the above conventional method,
When a foreign matter is detected by the foreign matter detecting means, the injection molding machine is stopped each time, and the worker goes to the injection molding machine to judge the situation, remove the foreign matter and restart the operation. However, in the above-mentioned conventional method, when the foreign matter is likely to fall immediately, for example, even when the foreign matter is caught in the mold during the fall of the foreign matter, the mold is stopped, and the operator confirms each time. Therefore, there is a problem that it becomes a hindrance to automatic driving.

Therefore, the present invention has been made to solve the above problems, and an object thereof is to allow small foreign matters to be dropped automatically and to reduce the number of times the apparatus is stopped, (EN) Provided are an injection molding machine control method and an apparatus therefor capable of enabling fully automatic operation and increasing productivity.

[0005]

The present invention has the following constitution in order to achieve the above object. That is, in the method of the present invention, in the control method of the injection molding machine which performs the high-speed mold closing, the low-speed low-pressure mold closing, the foreign matter detection, the strong mold clamping, the injection molding, the high-speed mold opening, and the ejector molding cycle. When foreign matter is detected, high-speed mold opening, ejector, high-speed mold closing,
The low-speed low-pressure mold closing and foreign matter detection cycles are performed a set number of times, and if the foreign matter is no longer detected at the stage where the set number of times is not reached, the molding cycle is continued, and if the foreign matter is still detected when the set number of times is reached, injection is performed. The feature is that the molding machine is stopped. Further, in the device of the present invention, high-speed mold closing,
In a controller of an injection molding machine having a control unit for performing low-speed low-pressure mold closing, foreign matter detection, strong mold clamping, injection molding, high-speed mold opening, and ejector molding cycle, the control unit uses a detection unit to detect foreign matter between molds. When it detects, the cycle of high-speed mold opening, ejector, high-speed mold closing, low-speed low-pressure mold closing, and foreign matter detection is performed a set number of times. The feature is that the injection molding machine is stopped if foreign matter is still detected when the set number of times is reached. It is preferable that the control unit can selectively stop the injection molding machine in a mold open state or a mold closed state by a selection switch.

[0006]

When a foreign substance is detected, the injection molding machine is not immediately stopped as in the conventional case. There is a high possibility that the product will be dropped due to vibrations of movement, so that it is not necessary to stop the injection molding machine each time, automatic operation can be continued, and productivity is improved. However, when foreign matter is detected, it must be removed manually, and in this case, the molding machine is stopped.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The injection molding machine is controlled by closing the mold at a high speed, then closing the mold at a low speed and a low pressure following this high-speed mold closing, and then performing a strong mold clamping to maintain the pressure in this state and the mold is injected from the injection device into the mold. Injection filling with molten resin,
After cooling and solidification, the mold is opened at high speed and ejector of the product is ejected by the ejector pin to control one molding cycle. When moving to strong mold clamping, the mold is closed at low speed and low pressure in order to absorb the shock of mold closing, but it is common to detect foreign matter by using mold closing at low speed and low pressure. Is.

FIG. 1 shows a flow chart of control of an injection molding machine according to the present invention. In the figure, the foreign matter detection monitor 10 displays the case where the mold does not shift to the strong mold clamping even after the preset range width time has elapsed with respect to the time from the mold closing shift at a normal low speed and low pressure to the shift to the strong mold clamping. It is set to detect the presence of foreign matter. That is, the mold closing by the low speed and low pressure, when the foreign matter is sandwiched by the mold, the foreign matter is kept at a low pressure that is not crushed by the mold closing, and therefore when the foreign matter exists, it does not shift to the strong mold clamping. Since more than the normal time has elapsed, if this state is detected, it is determined that there is a foreign substance. A movable type position sensor may be provided, and the presence or absence of foreign matter may be determined by detecting whether or not the movable type has approached the fixed type by a predetermined distance.

As shown in the figure, the foreign matter detection monitor 1
If foreign matter is not detected by 0 , normal molding cycle, that is, high-speed mold closing 12, low-speed low-pressure mold closing 14, strong mold clamping 16, injection device advancement 18, injection process 20, high-speed mold opening, automatic operation of ejector process Will continue. On the other hand, when the movable mold is not located at the predetermined mold clamping position even after the lapse of a predetermined time after the low-speed low-pressure mold closing, the foreign matter detection monitor 1
It is determined that there is a foreign matter by 0 , and in this case, the mold opening step,
The ejector process, high-speed mold opening 12, low-speed low-pressure mold closing 14, and foreign matter detection process are repeated a set number of times. If no foreign matter is detected during this time, the process shifts to the normal molding cycle and the molding cycle continues. To do. If the foreign matter is still detected after repeating the set number of times, the molding machine is stopped in the mold open state and the operator is notified of the abnormality.

As described above, when the foreign matter is detected, the injection molding machine is not immediately stopped as in the conventional case, but the mold opening,
While the ejector and mold closing steps are repeated, foreign objects are likely to be dropped off by ejector pins or dropped due to vibration of mold movement, etc. Therefore, it is not necessary to stop the injection molding machine each time, and automatic Operation can be continued and productivity is improved. However, when foreign matter is detected, it must be removed manually, and in this case, the molding machine is stopped. The number of times the mold opening, ejector, and mold closing steps are repeated is not particularly limited, and may be appropriately set depending on the type of mold, the type of resin, and the like.
It is preferable that the setting of the number of times can be freely set by a setting device (not shown). Further, although it is the stop position of the molding machine, in the above-mentioned embodiment, it is stopped in the mold open state after the foreign matter is detected. It can also be set.
This stop position may also be selected by a selection switch (not shown).

Although the present invention has been variously described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0012]

According to the control method of the injection molding machine and the apparatus therefor of the present invention, the mold opening, ejector and mold closing steps are repeated a set number of times without stopping the molding machine immediately when a foreign substance is detected, If foreign matter is no longer detected when the set number of times is not reached, the molding cycle is continued, and if foreign matter is still detected when the set number of times is reached, the injection molding machine is stopped. ,
While repeating the mold closing process, foreign substances are likely to be dropped by the ejector pin or dropped due to vibration of mold movement, etc. Therefore, it is not necessary to stop the injection molding machine each time, and automatic operation is possible. You can continue and improve your productivity.

[Brief description of drawings]

FIG. 1 is a flowchart showing an example of control contents of a molding machine.

[Explanation of symbols]

10 Foreign object detection monitor

Claims (3)

[Claims] 1. A method of controlling an injection molding machine for performing high-speed mold closing, low-speed low-pressure mold closing, foreign matter detection, strong mold clamping, injection molding, high-speed mold opening, and ejector molding cycle, wherein foreign matter between the molds is detected by a detection means. When detecting,
The ejector, high-speed mold closing, low-speed low-pressure mold closing, and foreign matter detection cycle are performed a set number of times.
A method for controlling an injection molding machine, which comprises stopping the injection molding machine when foreign matter is still detected when the set number of times is reached. 2. A control device for an injection molding machine having a control unit for performing high-speed mold closing, low-speed low-pressure mold closing, foreign matter detection, strong mold clamping, injection molding, high-speed mold opening, and ejector molding cycle, wherein the controller is , When foreign matter between the molds is detected by the detecting means, high speed mold opening, ejector, high speed mold closing, low speed low pressure mold closing,
The foreign material detection cycle is performed a set number of times, and if the foreign material is no longer detected at the stage where the set number of times is not reached, the molding cycle is continued, and if the foreign material is still detected when the set number of times is reached, the injection molding machine is stopped. A control device for an injection molding machine, which is characterized in that 3. The control device for an injection molding machine according to claim 2, wherein the control unit can selectively stop the injection molding machine in a mold open state or a mold closed state by a selection switch.