JPH11179776A - Temperature monitoring method of injection molder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the temperature monitoring method of an injection molder, the monitoring of the temperature conditions of which during its automatic or semi-automatic operation or before the start and at the finish of its operation becomes possible and, at the same time, the automatic monitoring of the temperature conditions of which even at the abnormal stoppage and interruption of its operation, during its manual running or at the mounting of molds becomes possible. SOLUTION: During the automatic or semi-automatic operation of an injection molder, the absence or presence of the monitorings of respective temperatures on the basis of a molding cycle time is set so as to monitor the temperature conditions at the predetermined monitoring timing. At the abnormal stoppage or interruption of the injection molder, during its manual operation or at the mounting of molds or at the start of its automatic or semi-automatic operation and after its finish, monitoring time interval and the absence or presence of the monitoring on the basis of this time interval are set in order to constitute to automatic changing-over to a monitoring action at a certain time interval on the basis of the above-mentioned setting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for monitoring a temperature state of a barrel or a mold of an injection cylinder in an injection molding machine. Monitoring of the temperature state at the time of mold installation or before and after the start of production is possible, and it is possible to easily judge the temperature state and to judge the operation startup state for stable production. The present invention relates to a method for monitoring the temperature of an injection molding machine capable of achieving an improvement in productivity.

[0002]

2. Description of the Related Art In a normal molding cycle process of an injection molding machine, a section in which an operation change is remarkable and a section in which an operation change is gradual are mixed, and a plurality of sections having greatly different operation states (speed, pressure, etc.) as a whole. Exists.

In order to measure such an operation state, generally, a fixed sampling timing is set, and measurement data is extracted at each sampling timing during a predetermined measurement time.

In particular, in order to accurately grasp an operating state in which a change is remarkable, it is necessary to set a short sampling timing. However, if the sampling timing is set short, the number of measurements in a predetermined measurement time increases, which leads to an increase in the capacity and cost of a memory and a storage medium for storing and holding the measurement data. However, there is a drawback in that the display processing and the analysis processing by the CPU require a large processing time.

Therefore, conventionally, when sampling and measuring the operating state during the molding cycle process at a predetermined timing, the molding cycle process is divided into a plurality of sections, and an appropriate sampling is performed for each of the divided sections. And a method of measuring the operating state by setting the timings described above (Japanese Patent Publication No. 6-43087).

However, in an injection molding machine, it is important that the temperature condition of a barrel or the like is stable as an operating condition which affects quality of a molded product in particular. It is essential to sample and measure the condition, that is, to monitor the temperature.

In view of the above, conventionally, PID control has been used for controlling the temperature of the barrel of an injection cylinder and the temperature of a mold in an injection molding machine. Therefore, the control cycle of the proportional control is set to be very short, about 2 to 5 seconds.
However, in the temperature control by the PID control, the ratio of the heater ON / OFF operation in the control cycle (the duty ratio within the control cycle) is set as the manipulated variable (control output), so that the heater ON / OFF operation is performed in each control cycle. Since the control is set so as to perform the monitoring, frequent monitoring is performed, and the above-described difficulty is caused.

For this reason, in an injection molding machine in which the above-described temperature control is performed, the following display display method is used as a method for intermittently monitoring a temperature state such as a barrel temperature and a mold temperature of an injection cylinder. Has been implemented.

(1) In order to control the barrel temperature and the mold temperature, the measured actual temperature is numerically displayed on a display section of a man-machine interface as a data as shown in FIG. In this case, for each molding cycle, the display is set while updating the data display at a predetermined monitoring timing (for example, when the cooling timer of the injection molded product in the mold is completed).

(2) During automatic control or semi-automatic control of the injection molding machine, data is stored at the predetermined monitoring timing, and these data are displayed in a table as shown in FIG. Set to output.

(3) The display section of the man-machine interface is set to display a table by numerical values as shown in FIG. 8 and to display a trend by a line graph.

[0012]

However, in the conventional temperature monitoring method for an injection molding machine, the temperature is intermittently monitored at a predetermined monitoring timing only during automatic or semi-automatic operation. Because it is not during automatic or semi-automatic operation, for example, when starting or restarting production of injection molded products, only the current temperature state is known, and when the temperature has become stable, Alternatively, since the history of the temperature state such as how much time has passed since the stable state is not known, it is difficult to determine an appropriate operation start-up state for stable production.

[0013] In addition, not only does the history of the temperature state during the manual operation or at the time of mounting of the mold be known, but also when the production of the injection molded product is interrupted due to some circumstances, it is difficult to obtain the same. The disadvantage was that the history of the temperature conditions during the interruption was not known.

The inventor of the present invention has conducted intensive studies. As a result, during the automatic or semi-automatic operation of the injection molding machine, the temperature of the injection cylinder, such as the barrel temperature and the mold temperature, is controlled by a predetermined monitoring timing. After the operation of the injection molding machine is interrupted due to an abnormal stop, etc., or when the operation is performed manually or when the mold is mounted, a change in the operation mode or a change in the monitoring timing is sensed, and a predetermined By automatically switching from the monitoring operation at the monitoring timing of the monitoring to the monitoring operation at a fixed time interval, continuous monitoring can be performed even if the predetermined timing for monitoring in the automatic or semi-automatic control mode is lost. And eliminate the above-mentioned problems. I have found that it is.

When the monitoring operation is performed at a constant time interval, continuous monitoring of the temperature state can be easily and simply performed before and after the automatic or semi-automatic operation of the injection molding machine is started. It was found that this could be achieved.

Accordingly, an object of the present invention is to enable continuous monitoring of the temperature state at a predetermined monitoring timing during automatic or semi-automatic operation of an injection molding machine, and to prevent abnormal operation or interruption during operation. To provide a temperature monitoring method for an injection molding machine that enables automatic monitoring of a temperature state even during manual operation or mold mounting, or before and after automatic or semi-automatic operation of the injection molding machine is started. It is in.

[0017]

In order to achieve the above object, a method for monitoring the temperature of an injection molding machine according to the present invention comprises a method of monitoring a barrel temperature and a mold temperature in an injection cylinder of an injection molding machine. At the time of automatic or semi-automatic operation of the molding machine, the presence or absence of monitoring of each temperature based on the molding cycle time is set, and each temperature state is monitored at a predetermined monitoring timing based on this setting, and the injection molding machine is abnormally stopped. At the time or interruption, at the time of manual operation or mold mounting, or before and after the start of automatic or semi-automatic operation, by setting the monitoring time interval of monitoring of each temperature and the presence or absence of monitoring by this time interval, Based on this setting, it automatically switches to monitoring operation at fixed time intervals. To.

In this case, when the injection molding machine is abnormally stopped or stopped, during manual operation, or when mounting a mold,
It can be configured such that a change in the operation mode or a change in the monitoring timing of each temperature state (non-monitoring time) is sensed, and the monitoring operation is performed at regular time intervals.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a temperature monitoring method for an injection molding machine according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart of an operation program for executing the temperature monitoring method in the injection molding machine of the present invention.

That is, a method of monitoring the temperature state of the injection cylinder, such as the barrel temperature and the mold temperature, based on the different operation states of the injection molding machine will be described with reference to FIG.

1. Monitoring during automatic and semi-automatic operation
In this case, at the same time as the start of the temperature monitoring program, it is determined in the first step STEP-1 whether the operation mode of the injection molding machine, automatic or semi-automatic operation, is selected. Next, if the operation is an automatic or semi-automatic operation, the start of the predetermined monitoring is determined in the second step STEP-2. If it is a normal operation state, predetermined monitoring is started, and in a third step STEP-3, it is determined whether or not a predetermined monitoring timing (for example, when a cooling timer of an injection molded product in a mold is completed) has been reached. Determine. Therefore, when the predetermined monitoring timing has been reached, a monitoring process such as a monitoring screen display example described later is performed in the fourth step STEP-4. If the monitoring timing has not been reached in the third step STEP-3, another process is performed.

2. Abnormal stop or interruption in automatic / semi-automatic operation
Time monitoring This case is a case where the predetermined monitoring is not started in the second step STEP-2 because the normal operation state is not obtained due to interruption or the like. At this time, in a fifth step STEP-5, it is determined whether or not there is a flag for non-monitoring (not monitoring) of the monitoring data. Next, if the flag is in a state of interruption or the like, it is determined that the flag is present, and it is determined in the sixth step STEP-6 how much the interruption has been made, that is, whether the non-monitoring time has passed a certain time. That is, the fixed time is, for example, a molding cycle time (second) in the case of performing injection molding by one shot.
× 2 can be set as a reference. If the non-monitoring time has passed a predetermined time, the flag for non-monitoring is reset from yes to no in a seventh step STEP-7, and then the non-monitoring is performed in an eighth step STEP-8. The time measurement for a certain period of time ends. After the end of the non-monitoring time measurement, steps S11 to S16 to be described later are performed.
The processing of TEP-11 to TEP-16 is performed.

On the other hand, if there is no flag for non-monitoring of the monitoring data in the fifth step STEP-5, that is, if it is in a normal operating state until immediately before, a non-monitoring is performed in a ninth step STEP-9. After setting the flag for
In step 0 of step 0, time measurement is started for a certain period of non-monitoring. Then, in this case, other processing is performed in the same manner as in the case where the non-monitoring time has not passed the predetermined time in the sixth step STEP-6.

3. Suitable for manual operation or mold mounting
In this case, it is determined that the automatic or semi-automatic operation, which is the operation mode of the injection molding machine, is not selected in the first step STEP-1. At this time,
First, in an eleventh step STEP-11, monitoring by time intervals (temperature time monitor of FIG. 4 described later)
Is determined. Next, if there is monitoring by a time interval, the next twelfth step STEP-12
It is determined whether monitoring has been started at a fixed time interval (for example, 20 seconds). If monitoring has been started at the time interval, it is determined in a thirteenth step STEP-13 whether the time interval has been reached. If the time interval has been reached, a fourteenth step STEP-1
In 4, the monitoring time measurement ends, and in the above-described fourth step STEP-4, monitoring processing is performed. The eleventh step STEP-1
If the monitoring at the time interval is not performed in 1, another processing is performed. If the time interval has not been reached in the thirteenth step STEP-13, another process is performed.

On the other hand, the twelfth step STEP-1
If monitoring has not been started at certain time intervals in Step 2, the fifteenth step STEP-15
After reading of a constant time interval setting for monitoring is performed in step, and then, in step 16 of step 16, the measurement of monitoring time is started,
In step STEP-13, it is determined whether or not the time interval has been reached, and the above-described monitoring processing or other processing is performed.

4. Before and after start of automatic / semi-automatic operation
Subsequent monitoring In this case, the monitoring process exactly the same as the above-mentioned "3. Monitoring at the time of manual operation or mounting of the mold" is performed.

5. Monitoring Display Example However, in the above-described monitoring process by executing the program shown in FIG. 1, for example, a monitoring display by the display device 10 as shown in FIG. 2 is performed to instruct execution and selection of monitoring. Can be.

That is, in FIG. 2, the display device 10 is a screen display unit 1 formed of a liquid crystal touch panel or the like.
The screen display unit 12 is laid out with setting displays for general molding conditions of the injection molding machine. A screen display selection button group 14 for selecting a plurality of types of screen displays is provided at the lower edge of the screen display unit 12. A direct screen selection button group 16 is provided below the screen display unit 12 of the display device 10 so as to select a plurality of types of screen displays including monitoring and the like.

Therefore, when the execution of monitoring is started, by pressing the screen selection button 16a for "monitor" from the group of direct screen selection buttons 16 on the display device 10 shown in FIG. Execution start can be instructed.

When the start of monitoring is instructed, a monitor screen 13 displaying an injection molding condition including a temperature state display section 13a is displayed on the screen display section 12 of the display device 10 as shown in FIG. 3, for example. Is displayed.

Therefore, by pressing a screen display selection button 15a for "monitor management" from among the screen display selection button group 15 on the monitor screen 13, for example, as shown in FIG. Is displayed on the display.

However, the monitor management screen 17 shown in FIG.
Is set so that a "monitor value", a "reference value", and a "permissible value" are displayed for each barrel and mold temperature of the injection cylinder. Also,
"Temperature time monitor" that is monitoring by time interval
And the time (seconds) of the “monitor interval”, which is a fixed time interval, is set to be displayed. The “temperature time monitor” indicates that the monitoring of the time interval is not performed by displaying “absent”, and is set at a predetermined “monitoring interval (for example, 20 seconds)” by displaying “present”. Indicates that monitoring is to be performed at intervals of time.

As shown in FIG. 5, the monitoring display displays the elapsed time instead of the shot number in FIG. 8 of the conventional example at the left end of the screen, thereby starting or restarting the production. It can be seen that it is easy to determine a suitable time for the test.

As described above, according to the temperature monitoring method for an injection molding machine according to the present invention, during the automatic or semi-automatic operation of the injection molding machine, the respective temperature conditions are properly monitored at a predetermined monitoring timing. In addition, the monitoring operation can be performed automatically at regular time intervals, especially when the injection molding machine is stopped or stopped abnormally, during manual operation or when the mold is mounted, or before and after the start of automatic or semi-automatic operation. To continuously determine the barrel temperature and mold temperature suitable for starting or restarting the production of injection-molded products, and to determine the appropriate timing for starting or restarting production. And the waste of the resin material can be eliminated.

That is, according to the present invention, when starting or restarting the production of an injection molded product by the injection molding machine, it is possible to appropriately and surely determine the respective states of the barrel temperature and the mold temperature up to that time. Therefore, it is possible to judge a timing suitable for starting or resuming production, it is possible to minimize unnecessary purging of resin, and it is possible to easily achieve stability at the start of production.

Further, even when the production is interrupted due to some circumstances, the barrel temperature and the mold temperature can be continuously monitored during the interruption.
It is possible to determine a timing suitable for continuing the production, and it is possible to obtain an advantage that waste of the resin material can be easily eliminated.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and many design changes can be made without departing from the spirit of the present invention. It is.

[0039]

As described above, the method for monitoring the temperature of an injection molding machine according to the present invention is a method for monitoring barrel temperature and mold temperature in an injection cylinder of an injection molding machine. Sometimes, the presence or absence of the monitoring of the respective temperatures based on the molding cycle time is set, and the respective temperature states are monitored at predetermined monitoring timings based on the setting, and when the injection molding machine is abnormally stopped or interrupted, manual operation is performed. At the time or at the time of mounting the mold, or before and after the start of the automatic or semi-automatic operation, a monitoring time interval for monitoring each temperature and whether or not monitoring is performed at this time interval are set, and a predetermined time is set based on this setting. By configuring to automatically switch to monitoring operation by interval, injection Barrel temperature and mold temperature suitable for starting product production are continuously monitored to make it easier to determine when to start production and eliminate waste of resin material. Many excellent advantages can be obtained, such as high-quality injection molding adapted to the characteristics of the injection-molded product can be smoothly achieved.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an embodiment of an operation program for implementing a temperature monitoring method for an injection molding machine according to the present invention.

FIG. 2 is an explanatory diagram showing an example of an overall display on a display device obtained by the temperature monitoring method shown in FIG. 1;

FIG. 3 is an explanatory diagram showing a display example of a monitor screen when a monitor screen is selected in the display device shown in FIG. 2;

FIG. 4 is an explanatory diagram showing a display example of a monitor management screen when a monitor management screen is selected in the display device shown in FIG. 3;

FIG. 5 is an explanatory diagram showing a display example of a temperature table screen when a monitor management screen is selected in the display device shown in FIG. 3;

FIG. 6 is an explanatory diagram showing a display example of a typical monitor screen by a temperature state monitoring method in a conventional injection molding machine.

FIG. 7 is an explanatory diagram showing a display example of a temperature table screen by a conventional method for monitoring a temperature state in an injection molding machine.

FIG. 8 is an explanatory view showing a display example of a temperature trend screen according to a conventional method for monitoring a temperature state in an injection molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Display apparatus 12 Screen display part 13 Monitor screen 13a Temperature state display part 14 Screen display selection button group 15 Screen display selection button group 15a Monitor management screen display selection button 16 Direct screen selection button group 16a Monitor screen selection button 17 Monitor management screen

Claims (2)

[Claims] 1. A method for monitoring a barrel temperature and a mold temperature in an injection cylinder of an injection molding machine, wherein the automatic or semi-automatic operation of the injection molding machine sets whether or not to monitor each of the temperatures based on a molding cycle time. Based on this setting, each temperature state is monitored at a predetermined monitoring timing, when the injection molding machine is abnormally stopped or interrupted, during manual operation or when attaching a mold, or before and after the start of automatic or semi-automatic operation. The present invention relates to an injection molding machine, wherein a monitoring time interval for monitoring each temperature and whether or not monitoring is performed based on the time interval is set, and the operation is automatically switched to a monitoring operation at a constant time interval based on the setting. Temperature monitoring method. 2. At the time of abnormal stop or interruption of the injection molding machine, at the time of manual operation, at the time of mounting a mold, or the like, a change in operation mode or a change in monitoring timing of each temperature state (non-monitoring time) is sensed. 2. The temperature monitoring method for an injection molding machine according to claim 1, wherein the monitoring operation is performed at regular time intervals.