JP3669828B2 - Temperature monitoring method for injection molding machines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for monitoring the temperature state of an injection cylinder barrel, mold, etc. in an injection molding machine, and in particular during the interruption of production of an injection molded product, during manual operation, when a mold is attached, or in production. Enables monitoring of the temperature state before and after the start of the operation, making it possible to easily determine the temperature state, and to determine the operation start-up state for stable production, thereby improving productivity. The present invention relates to a temperature monitoring method for an injection molding machine.
[0002]
[Prior art]
In a normal molding cycle process in an injection molding machine, there are a plurality of sections in which the operation change (speed, pressure, etc.) varies greatly as a whole, with a section where the operation change is remarkable and a section where the operation change is slow.
[0003]
In order to measure such an operating state, generally, a certain sampling timing is set, and measurement data is extracted at each sampling timing during a predetermined measurement time.
[0004]
In particular, in order to accurately grasp the operating state where the change is significant, it is necessary to set the sampling timing short. However, if the sampling timing is set short, the number of measurements in a predetermined measurement time will increase, leading to an increase in capacity and cost of memory and storage media that store measurement data. However, the display processing and the analysis processing by the CPU also have a drawback that a long processing time is required.
[0005]
Therefore, conventionally, when the operation state during the molding cycle process is sampled and measured at a predetermined timing, the molding cycle process is divided into a plurality of sections, and an appropriate sampling timing is set for each divided section. A method of setting and measuring the operating state has been proposed (Japanese Patent Publication No. 6-43087).
[0006]
However, in an injection molding machine, it is important that the temperature state of the barrel, etc. is stable, especially as an operating state that affects the quality of the molded product. Therefore, the temperature state during the normal molding cycle process is sampled. Therefore, it is essential to measure the temperature, that is, to monitor the temperature.
[0007]
Therefore, conventionally, PID control is used for temperature control such as the barrel temperature and mold temperature of the injection cylinder in the injection molding machine, and is proportional to the demand for high-speed response to improve the temperature adjustment accuracy. The control cycle of the control is set to be as short as about 2 to 5 seconds. However, in temperature control based on PID control, the heater on / off operation ratio (energization rate within the control cycle) in the control cycle is the manipulated variable (control output), so the heater is turned on / off at each control cycle. Since the control is set so as to do so, monitoring is frequently performed, and the above-described drawbacks are present.
[0008]
For this reason, in the injection molding machine in which the temperature control as described above is performed, the following display display method is implemented as a method for intermittently monitoring the temperature state such as the barrel temperature of the injection cylinder and the mold temperature. ing.
[0009]
(1) In order to carry out temperature control such as the barrel temperature and mold temperature, the measured actual temperature is displayed as data on the display unit of the man-machine interface as a numerical value as shown in FIG. In this case, for each molding cycle, a setting is made so that the display is performed 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).
[0010]
(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. 7 and output to the printer. Set to.
[0011]
(3) The display unit of the man-machine interface is set to display a numerical table as shown in FIG. 8 and to display a trend graph using a line graph.
[0012]
[Problems to be solved by the invention]
However, in the conventional temperature monitoring method of the injection molding machine, the temperature is intermittently monitored at a predetermined monitoring timing only during the automatic or semi-automatic operation. When not in operation, for example when starting or restarting production of injection-molded products, only the current temperature state is known, at what time the temperature has become stable, or to what extent it has been stable Since the history of the temperature state, such as whether time has passed, is not known, there is a difficulty that it is not possible to determine the proper operation start-up state for stable production.
[0013]
In addition, during manual operation or when the mold is mounted, not only the history of the temperature state during that time is unknown, but also when the production of injection molded products is interrupted for some reason, the interruption is also interrupted. There was a difficulty that the history of the temperature condition was not known.
[0014]
Therefore, as a result of intensive research, the present inventor has monitored the temperature state such as the barrel temperature and mold temperature of the injection cylinder at a predetermined monitoring timing during the automatic or semi-automatic operation of the injection molding machine. In addition, when the operation of the injection molding machine is interrupted due to an abnormal stop or the like, or during manual operation or when a mold is mounted, the operation mode selection and monitoring timing changes are monitored, and the predetermined By switching from the monitoring operation based on the monitoring timing to the monitoring operation at a fixed time interval set separately, continuous monitoring can be performed even if there is no predetermined timing for monitoring in the automatic or semi-automatic control mode. To solve the problems mentioned above. I found out Rukoto.
[0015]
In addition, when performing monitoring operations at regular time intervals in this way, continuous monitoring of the temperature state can be achieved easily and simply even before and after the start of the automatic or semi-automatic operation of the injection molding machine. I knew I would get it.
[0016]
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 the injection molding machine, and to perform manual operation when the operation is abnormally stopped or interrupted. An object of the present invention is to provide a temperature monitoring method for an injection molding machine that can automatically monitor the temperature state even at the time of or at the time of mold installation, or before and after the start of the automatic or semi-automatic operation of the injection molding machine.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, the temperature monitoring method for an injection molding machine according to the present invention comprises:
In the monitoring method such as the barrel temperature and mold temperature in the injection cylinder of the injection molding machine,
In the control mode corresponding to the mode-selected automatic or semi-automatic operation, a first stage of setting a monitoring timing synchronized with the molding process and monitoring each temperature state by this timing;
Set separately from the predetermined monitoring timing when the injection molding machine is abnormally stopped or interrupted, during manual operation or when a mold is mounted, or in the non-control mode corresponding to before or after the start of automatic or semi-automatic operation A second stage of setting a predetermined monitoring time interval for monitoring and the presence / absence of monitoring at the time interval, and performing a monitoring operation at a predetermined time interval based on the setting, and the first stage to the second stage The third step is performed by selecting the control mode to the non-control mode.
In that case, during the execution of the first stage corresponding to the control mode, if the predetermined monitoring start condition is not satisfied and the preset non-monitoring time has elapsed, the process automatically proceeds to the second stage. It is preferable to further include the step of switching automatically as the third stage.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
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.
[0020]
FIG. 1 is a flowchart of an operation program for implementing a temperature monitoring method in an injection molding machine of the present invention.
[0021]
That is, based on FIG. 1, the monitoring method of temperature states, such as the barrel temperature of an injection cylinder, mold temperature, etc. based on the different driving | running state of an injection molding machine is demonstrated.
[0022]
1. Monitoring in automatic / semi-automatic operation (control mode) In this case, simultaneously with the start of the temperature monitoring program, the control mode corresponding to the automatic or semi-automatic operation which is the operation mode of the injection molding machine in the first step STEP-1 It is determined whether or not is selected. Next, if it is an automatic or semi-automatic operation, a predetermined monitoring start is determined in the second step STEP-2. And if it is a normal driving | running state, predetermined monitoring will be started and it will be determined whether the timing of predetermined monitoring (for example, at the time of completion of the cooling timer of the injection molded product in a metal mold | die) was reached in 3rd step STEP-3. Determine. Accordingly, when the predetermined monitoring timing is 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 is not reached in the third step STEP-3, a program other than temperature monitoring (hereinafter referred to as “other processing”) is performed in the main flow of the injection molding machine.
[0023]
2. Monitoring during abnormal stop or interruption (non-control mode) in automatic / semi-automatic operation In this case, in the second step STEP-2, because the operation is not normal due to interruption, the predetermined monitoring start is not performed. It is. At this time, in the fifth step STEP-5, it is determined whether or not there is a flag for non-monitoring (not monitoring) the monitoring data. Next, if the flag continues to be in a suspended state or the like, it is determined that it is present, and how much has been suspended in the sixth step STEP-6, that is, whether a non-monitoring time has passed a predetermined time. Determine whether or not. That is, the fixed time can be set with reference to, for example, twice the molding cycle time (seconds) in the case of performing injection molding by one shot. Then, if the non-monitoring time has passed the fixed time, the flag for non-monitoring is changed from “Yes” to “No” in the seventh step STEP-7, that is, after the OFF is set, the eighth step In STEP-8, the time measurement for the predetermined time related to non-monitoring is terminated. And after completion | finish of this non-monitoring time measurement, the process of the 11th-16th steps STEP-11-11 mentioned later is performed.
[0024]
On the other hand, if there is no non-monitoring flag for the monitoring data in the fifth step STEP-5, that is, if it is a normal operating state until just before, the non-monitoring is performed in the ninth step STEP-9. After the flag is set from “no” to “present”, time measurement is started in a tenth step STEP-10 for a non-monitoring fixed time. 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.
[0025]
3. Monitoring during manual operation or when the mold is attached ( non-control mode ) In this case, it is determined that automatic or semi-automatic operation, which is the operation mode of the injection molding machine, is not selected in the first step STEP-1. is there. At this time, first, in the eleventh step STEP-11, it is determined whether or not there is monitoring by a time interval (temperature time monitor of FIG. 4 described later). Next, if there is monitoring at a time interval, it is determined at the next twelfth step STEP-12 whether monitoring at a certain time interval (for example, 20 seconds) is started. If monitoring is started at the time interval, it is determined whether or not the time interval has been reached in a thirteenth step STEP-13. If the time interval has been reached, the monitoring time measurement is terminated in the fourteenth step STEP-14, and the monitoring process is performed in the fourth step STEP-4 described above. In the eleventh step STEP-11, when there is no monitoring by time interval, other processing is performed. Further, when the time interval is not reached in the thirteenth step STEP-13, another process is performed.
[0026]
On the other hand, in the twelfth step STEP-12, when the monitoring is not started at a constant time interval, the monitoring at the constant time interval setting is read in the fifteenth step STEP-15, and then the sixteenth step STEP-15. After the monitoring time measurement is started in step STEP-16, it is determined whether or not the time interval has been reached in the thirteenth step STEP-13, and the above-described monitoring process or other processes are performed. .
[0027]
4). Monitoring before and after the start of automatic / semi-automatic operation ( non-control mode ) In this case, the same monitoring process is performed as in “3. Monitoring during manual operation or mold installation (non-control mode)” in the previous section. Is called.
In FIG. 1, the routine consisting of steps STEP-6, STEP-7, and STEP-8 is not executed when the process proceeds to step STEP-5 in a state where the predetermined monitoring start condition is not satisfied in step STEP-2. If there is a monitoring flag and a preset non-monitoring time has elapsed, there is some abnormal state in the operation of the injection molding machine as a reason why the predetermined monitoring start condition in Step STEP-2 is not satisfied. Assuming that this has occurred, the process proceeds to step STEP-11.
On the other hand, if it is determined in step STEP-6 that the non-monitoring time has not elapsed, another processing, that is, once exiting from the temperature monitoring routine, and then when this temperature monitoring is executed again, If the predetermined monitoring start condition is satisfied in step STEP-2, the process does not proceed to step STEP-11 but proceeds to step STEP-3 as a normal state.
[0028]
5. Example of monitoring display However, in the monitoring process by the execution of the program shown in FIG. 1 described above, 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 configured.
[0029]
That is, in FIG. 2, the display device 10 includes a screen display unit 12 formed by a liquid crystal touch panel or the like, and the screen display unit 12 is laid out with a setting display for general molding conditions of the injection molding machine. A screen display selection button group 14 capable of selecting a plurality of types of screen display 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 that a plurality of types of screen displays including monitoring can be selected.
[0030]
Therefore, when monitoring execution is started, the monitoring execution start is performed by pressing the screen selection button 16a for “monitor” from the direct screen selection button group 16 in the display device 10 shown in FIG. Can be directed.
[0031]
When instructed to start monitoring, the screen display unit 12 of the display device 10 displays a monitor screen 13 on which injection molding conditions including a temperature state display unit 13a are displayed as shown in FIG. .
[0032]
Therefore, by pressing the screen display selection button 15a for “monitor management” from the screen display selection button group 15 on the monitor screen 13, for example, as shown in FIG. Is done.
[0033]
However, the monitor management screen 17 shown in FIG. 4 is set to display “monitor value”, “reference value”, and “allowable value” for each barrel and mold temperature of the injection cylinder, respectively. . Further, it is set to display the presence / absence of “temperature time monitor” which is monitoring by time interval and the time (second) of “monitor interval” which is a constant time interval. The “temperature time monitor” indicates that the time interval is not monitored by displaying “none”, and is set at a predetermined “monitor interval (for example, 20 seconds)” by displaying “present”. Indicates that time-based monitoring is performed over time.
[0034]
In addition, 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, which is suitable for starting or restarting production. It turns out that the judgment of the time becomes easy.
[0035]
As described above, according to the temperature monitoring method for an injection molding machine according to the present invention, when the injection molding machine is operated automatically or semi-automatically, each temperature state can be appropriately monitored at a predetermined monitoring timing. In addition, especially when the injection molding machine stops abnormally or is interrupted, during manual operation or when a mold is attached, or before or after the start of automatic or semi-automatic operation, it automatically switches to monitoring operation at regular time intervals. Continuous monitoring of barrel and mold temperature conditions suitable for starting or resuming production of injection-molded products, making it easier to determine when it is appropriate to start or resume production The waste of the resin material can be eliminated.
[0036]
That is, according to the present invention, when starting or restarting production of an injection molded product by an injection molding machine, it is possible to appropriately and reliably determine the state of the barrel temperature and the mold temperature until then, The timing suitable for starting or resuming production can be determined, wasteful resin purge can be minimized, and stability at the start of production can be easily achieved.
[0037]
In addition, even when production is interrupted due to some reason, it is possible to continuously monitor the barrel temperature and mold temperature during that time, making it possible to determine the appropriate time to continue production. The advantage that the waste of the resin material can be easily eliminated is obtained.
[0038]
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and many design changes can be made without departing from the spirit of the present invention.
[0039]
【The invention's effect】
As described above, the temperature monitoring method for an injection molding machine according to the present invention is as follows.
In the monitoring method such as the barrel temperature and mold temperature in the injection cylinder of the injection molding machine,
In the control mode corresponding to the mode-selected automatic or semi-automatic operation, a first stage of setting a monitoring timing synchronized with the molding process and monitoring each temperature state by this timing;
Set separately from the predetermined monitoring timing when the injection molding machine is abnormally stopped or interrupted, during manual operation or when a mold is mounted, or in the non-control mode corresponding to before or after the start of automatic or semi-automatic operation A second stage of setting a predetermined monitoring time interval for monitoring and the presence / absence of monitoring at the time interval, and performing a monitoring operation at a predetermined time interval based on the setting, and the first stage to the second stage The third stage is performed by selecting the control mode to the non-control mode, and during the execution of the first stage corresponding to the control mode, the predetermined monitoring is performed. When the start condition is not satisfied and a preset non-monitoring time has elapsed, the process proceeds to the second stage. By configured to include the third step further dynamically switching step,
Continuous monitoring of the barrel temperature and mold temperature suitable for starting production of injection-molded products at all times makes it easy to determine when it is appropriate to start production, and waste of resin materials 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 showing one 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 overall display example by the display device obtained by the temperature monitoring method shown in FIG. 1;
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 view 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 view 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.
FIG. 6 is an explanatory view 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 view showing a display example of a temperature table screen by a temperature state monitoring method in a conventional injection molding machine.
FIG. 8 is an explanatory diagram showing a display example of a temperature trend screen by a temperature state monitoring method in a conventional 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)

In the monitoring method such as the barrel temperature and mold temperature in the injection cylinder of the injection molding machine,
Mode selected automatically or control mode corresponding to the semi-automatic operation times, and the first stage of setting the timing of the monitoring in synchronism with the molding process, monitoring the respective temperature state by this timing,
What is the predetermined monitoring timing when the injection molding machine is abnormally stopped or interrupted, during manual operation or when a mold is attached, or in the non-control mode corresponding to before or after the start of automatic or semi-automatic operation? set the existence of monitoring by a predetermined monitoring time interval and the time interval for monitoring set separately, and the second stage performs a monitoring operation by a predetermined time interval on the basis of this setting, from the first stage A temperature monitoring method for an injection molding machine , comprising: a third step of switching to a second step, wherein the third step is performed by selecting a control mode to a non-control mode . 2. The second stage according to claim 1, wherein a predetermined non-monitoring time elapses when a predetermined monitoring start condition is not satisfied during execution of the first stage corresponding to the control mode. The temperature monitoring method for an injection molding machine is characterized in that the third stage further includes a step of automatically switching to .

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