JPH0622842B2 - Load output display method and device for injection molding machine - Google Patents

Description

The present invention relates to a method and an apparatus for displaying a list of operating states of control loads on a CRT screen or the like in an analog-digital common system in an injection molding machine or the like. Is.

[Conventional technology]

Among molding machines such as injection molding machines, those that have a function to display the operating state of the control load in a list have not been seen yet, and in order to achieve the purpose, prepare a dedicated measuring instrument different from the molding machine,
Wiring is performed from multiple output loads of the molding machine such as valves to the input terminals of the measuring equipment, and the on / off operation status of each load is displayed in multiple display with time on the horizontal axis and output voltage on the vertical axis. By the way.

[Problems to be solved by the invention]

In the current microcomputer type injection molding machine, it is possible to digitally set and input molding conditions (temperature, pressure, speed, switching position, time), etc., as well as various sensors to check whether the actual molding operation is operating as set. The measured value is displayed on the screen along with the set value and digitally displayed on the screen, or the difference between the two is detected and an alarm is issued if the difference is larger than a certain value. Further, these measured values and set values are also printed out digitally for each shot and stored.

However, as the molding work management, not only the digital display as described above, but also an analog display for displaying the time on the horizontal axis and the on / off voltage of each load on the vertical axis side by side may be required.

As a feature of analog display, it is convenient to grasp the whole phenomenon collectively, compare it with the data of the previous cycle, and monitor temporal variations. In many cases, the improvement and adjustment of the molding conditions based on such analog display data gives a conclusion earlier than the individual reading of the digital record. Sometimes, analog monitoring is more convenient for monitoring the cycle status over time.

In order to display the above output time in an analog manner in a test study, a measuring machine equipped with a sampling function, a RAM memory of a considerable capacity, and a display capability such as image processing and CRT is installed near the molding machine. Wiring work must be performed from multiple output loads of the molding machine to the input terminals of the measuring instrument. At this time, in order to display the output image accurately, the sampling time interval of the measuring instrument must be as short as possible and the memory capacity must be increased accordingly. Normally the sampling time interval is
Since it is 1/100 second, the measuring instrument as described above becomes quite expensive, and it was impossible to permanently place it near the molding machine to perform analog display.

[Purpose of the present invention]

The present invention has been made in view of the problems of the conventional example, and a purpose thereof is a molding process which has not been conventionally performed by using a central processing unit for controlling a process of an injection molding machine or a CRT display device. The output display method of the injection molding machine in which all the load processes of 1 are combined on one screen to display 1-0 analog display, and digital display is also added to improve process control such as temporal cycle status monitoring. And to provide a device using the method.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, in the first item, XY coordinates are set on the screen of the display device (7).

Then, the X-axis of the XY coordinates is set as the time axis, the injection molding load names are sequentially set along the Y-axis, and the operation line for each load is set parallel to the X-axis.

The work start time and the work end time of each load of the injection process are displayed on the work line corresponding to each load by the output of the microcomputer controller of the injection molding machine.

The technical means is adopted. In the second item, in the first item, the operating line and the non-operating line for each load are set in parallel with the X axis, and the work is finished from the work start time of each load. The time zone corresponding to the time is displayed on the operation line, and the time zone corresponding to the time is displayed on the non-operation line from the work end time to the next work start time.

In the third item, the work time in the same load process is calculated by subtracting the work start time from the work end time in the same load process in the first or second paragraph. When moving from the preload process to the next load process, the work end time of the preload process is subtracted from the next load process start time to calculate the load process switching time, and the work time and the load process switching time are digitally displayed, respectively. At the same time, the work start time of the previous cycle is subtracted from the work start time of the next cycle to digitally display the time of one cycle.

A storage device for storing the work start time of each load and the work end time of each load in the injection molding process in accordance with a signal from the microcomputer controller of the injection molding machine. Then, each memory of the storage device is read, the work start time is subtracted from the work end time in the same load process to calculate the work time, and when moving from the preload process to the next load process, Central processing that subtracts the work end time of the preload process from the work start time to calculate the load process switching time, and subtracts the work start time of the previous cycle from the work start time of the next cycle to calculate the time of one cycle Work and non-work corresponding to each unit of the work start time and work end time of each load in the injection molding process according to the signal from the unit and the microcomputer control unit of the injection molding machine. And displays a 1-0 line diagram on the in-to form a display device for displaying the operation time as well as the loading step switching time and cycle time of each loading step according to the result of the central processing unit in numeric.

Is adopted as a technical means.

[Operation] After the trial molding for 20 to 30 shots, when the molding work becomes stable, press the screen display start key on the operation panel (6) and press the Y axis of the display device (7). The load name is displayed along with, and when the mold clamping is started, the load operating state display starts.

The display action is according to the control program entered in the ROM (11) of the microcomputer control unit (9). For example, when mold clamping starts, the output ON time is stored in the clock pulse timer in units of 1/100 seconds, for example. The rising of 0 → 1 is displayed in the mold clamping process on the display screen at the same time as being stored in the device (20).

When the mold clamping is completed based on the control program after a while, the output off time is stored in the storage device (20), and at the same time, the rising of 0 → 1 is displayed in the mold clamping process on the display screen. The section from the rising edge of 0 → 1 to the falling edge of 1 → 0 is displayed as one line.

Next, the stored data of the load process start and end times of the storage device (20) is called to the central processing unit (10), and in the same process, Is converted into a decimal number and displayed, for example, with 2.36 sec and the display of [1] which is the operation display of the mold clamping process.

Hereinafter, the same procedure is repeated for each load, and the screen display as illustrated in FIG. 3 is obtained.

Also, when shifting from the previous load to the next load, Is calculated and the screen is displayed in the same manner.

For 1 cycle display, Is calculated and the screen is displayed in the same manner.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of an injection molding machine according to an embodiment of the present invention, and FIG. 2 is a microcomputer type process control device mounted on the injection molding machine and a load operation state display device of the present invention. FIG. 2 is a block diagram showing the whole, in which a portion related to the load operating state display device of the present invention is shown by a chain double-dashed line. FIG. 3 is an example of a CRT display screen according to the present invention, and FIG. 4 is a display operation in which one output on the screen shown in FIG. 3, for example, mold clamping output, rises from 0 to 1 and falls from 1 to 0. It is a flowchart explaining.

First, the schematic configuration of the injection molding machine will be described with reference to FIG. The injection molding machine (1) is a mold clamping device (2) equipped with a toggle type mold clamping mechanism, a heating cylinder (3) for injecting molten resin into the cavity, and resin pellets in the heating cylinder (3). A drive control unit for rotating and moving the screw of the heating hopper (3) and the feeding hopper (4) forward and backward.
It is composed of (5), an operation panel (6), and a display device (7).

Of the upper parts, the operation panel (6), the display device (7) and the lower part are the microcomputer type control device (9) for controlling the process of the injection molding machine, and the central processing unit (10).
Hereinafter, (simply referred to as CPU (10)) ROM memory (1
1), RAM memory (12), I / O interface (13),
It is composed of (14).

The display device (7) used in the present invention also serves as the display device of the above process control device, and no special device is separately provided.

Output device (15) via output interface (14) based on process control command for injection molding from CPU (10)
A signal (s) branched from the output signal (s) sent to the load operating state display is converted by the output buffer (16) for displaying the load operating state and sent to the display device (7). This conversion selects only the rising edge and the falling edge of the output signal (s'), and when the state does not change, it is 0 line (non-operation line).
This is a process for transmitting one line or one line (operation line).

The CPU (10) is provided with a tact pulse generator (17) which is the basis of microcomputer control, and generates a pulse with extremely high cycle accuracy by a crystal oscillator. The cycle is usually 1 microsecond, and one instruction of the program is read out to the CPU (10) from the ROM (11) in which the injection molding process program is written by the command of this tact pulse, and the operation is performed. The result is turned on and off of the target output device (15) through the output interface (14) to perform orderly automatic operation.

Next, an example of a screen displayed on the display device (7) according to the present invention will be described with reference to FIG.

First, on the Y-axis of the display screen, the injection molding load names are assigned in order from the top, for example, mold clamping, injection, charge, suck back, mold open, eject, cooling timer, etc., and are displayed at appropriate intervals.

A line 0 representing the non-actuation of each load name is drawn horizontally parallel to the time axis (that is, the X axis) to indicate the actuation 1
The height of the line is calculated and determined by the CPU (10) so as to be slightly lower than the 0 line of the process displayed immediately above.

Next, the X axis of the display screen is a time axis with the mold clamping start time as 0, and a time scale slightly longer than one cycle time of the molding machine is displayed in units of 1/100 seconds, for example.

This one cycle time is measured by the control device itself as follows. The tact pulse from the tact pulse generator (17) is made into a pulse having a frequency of, for example, 100 pulses per second by the frequency divider (18), and then inputted to the counter (19). counter
For example, (19) has a capacity that can be digitally recorded by sequentially updating the memory with 86,400 seconds for one day and night × 100 = 8,640,000 pulses. When the full count is reached, it automatically returns to 0 and starts counting again. There is. The count value of the counter (19) is transferred to the storage device value (20) together with the mold clamping start signal from the CPU (10), and the count value of the counter (19) is stored together with the mold clamping start signal of the next cycle. Transfer to (20). Here, for convenience, the data value of the operation start time is stored in the storage device.
In the RAM1 (20a) ... portion of (20), the data value of the operation end time is described as being stored in the RAM2 (20b).

Here, if T = M (RAM2) -M (RAM1) is calculated by the CPU (10), the time required for the same load process is
Obtained in units of 1/100 second. The time scale of the X axis is determined by slightly adding to the value.

Further, a key (22) for starting the screen display of the load operating state is provided on the surface of the operation panel (6).

The operation of the load operating state display device of the present invention thus refined will be described with reference to the flowchart of FIG.

After the trial molding of a few shots, when the molding work becomes stable, press the screen display start key (22)
The above-mentioned X-axis and Y-axis screens are displayed, and at the same time when the mold clamping is started, the load operation state display is started.

The display action is shown in the flowchart of FIG. 4 by taking the case of one output A as an example, the steps in the control (CPU (10)), the display (steps of the buffer (16) and CRT (17), and the tact time). Pulse [Counter (19), RAM1 (20a) ...
-RAM2 (21b) ... inside] steps are described in parallel.

According to the control program entered in the ROM (11) of the microcomputer controller (9), for example, when mold clamping starts, the output pulse on time is counted by the clock pulse counter (19), for example, in units of 1/100 second. , And at the same time it is stored in the RAM 1 (20a), a signal for displaying the rise of 0 → 1 on the display screen of the mold clamping load is displayed on the display device (7) via the output buffer (16). Send on the mold clamping load line.

When the mold clamping is completed by the control program after a little time, the output off time is stored in the RAM 2 (20b) ... At the same time, the trailing edge of 1 → 0 is displayed in the mold clamping process on the display screen. At the same time, the section from the rising edge to the falling edge is displayed as one line.

Next, the stored data of the time of RAM1 (20a) ..., RAM2 (20b) ... is called to the CPU (10), and the operation time in the same load process is calculated by T = M (RAM2) -M ( RAM1) is calculated, converted into a decimal number, and displayed together with, for example, 2.36 sec and 1 display of ON of the mold clamping process.

Hereinafter, the same procedure is repeated for each load, and the screen display as illustrated in FIG. 3 is obtained.

Also, when shifting from the previous load to the next load, Is calculated and the screen is displayed in the same manner.

For 1 cycle display, Is calculated and the screen is displayed in the same manner.

In the above embodiment, the operating time, the dead time, and the time of one cycle are calculated and displayed. However, the present invention is not limited to this, and only the working time [1] is displayed, or the working time and the dead time [1- 0] may be displayed. Further, the calculation of one cycle is not limited to the above-mentioned case, and it may be calculated by adding all the operating time and the non-operating time.

〔The invention's effect〕

The first term of the present invention is to set the XY coordinates on the screen of the display device, set the X axis of the XY coordinates as the time axis, and set the injection molding load names in order along the Y axis. The operation line for each load is set parallel to the X-axis, and the work start time and work end time of each load in the injection process by the output of the microcomputer controller of the injection molding machine are displayed on the work line corresponding to each load. As a result, the operating time is displayed in analog form so that the working time can be seen at a glance, which is useful for optimizing the operating time as described above. Moreover, the work start time and work end time of each load in the injection process are displayed directly on the display screen from the output of the microcomputer controller of the injection molding machine, so the time display is accurately displayed. Not only is it displayed by the output of the microcomputer control device of the injection molding machine, there is no need to read the memory of the storage device of the injection molding machine one by one unlike the conventional external monitor method, which simplifies the circuit configuration. I can do things.

Further, the second item is a detailed description of the display method of the first item, in which the operating line and the non-operating line for each load are indicated by X.
It is set parallel to the axis, and the time zone corresponding to the work start time to the work end time of each load is displayed on the operation line, and the relevant time zone is not operated from the work end time to the next work start time. It is displayed on the line. As a result, the operation and non-operation can be distinguished from each other and can be clearly seen.

The third term is a further limitation of the first or second term, in which the work start time is subtracted from the work end time in the same load step to calculate the work time in the same load step, and the previous load step to the next load step is calculated. When moving to the process, the work end time of the preload process is subtracted from the next load process start time to calculate the load process switching time, and the work time and the load process switching time are digitally displayed, respectively, and the work of the next cycle is performed. The work start time of the previous cycle is subtracted from the start time to digitally display the time of one cycle. As a result, it is possible to display the ON / OFF operating status of each load on the vertical axis by adding the digital calculation time to the analog display of the ON / OFF operating status of each load. Along with the time value, the operating time of each individual load, or the time lag time from the turning off of the previous load to the turning on of the next load, etc., is for example 1/100.
It can be displayed in seconds, and it is possible to find out at a glance if there is a load that is operating longer than necessary, which is useful for detailed study of measures to shorten the cycle.

Further, because of the above-mentioned configuration, for example, when ejecting is performed twice during mold opening, if load outputs of mold opening and ejecting are obtained as shown in Fig. 5, in this case, the ejecting operation is completed by the completion of mold opening. Since I haven't done so, I can take action to start the eject a little faster. Also, if the eject start is too early, the ejecting action of the molded product itself may become defective, but at that time, the ejecting action of the molded product is best performed while gradually gradually increasing the eject start. From the operation display at that time, it is possible to leave a record of good product molding and use it for the next molding.

Item 4 is an apparatus configuration for carrying out the method, and a storage device for storing the work start time of each load and the work end time of each load in the injection molding process in accordance with a signal from the microcomputer controller of the injection molding machine. Then, each memory of the storage device is read, the work start time is subtracted from the work end time in the same load process to calculate the work time, and when the process from the preload process to the next load process is performed, Central processing that subtracts the work end time of the preload process from the work start time to calculate the load process switching time, and subtracts the work start time of the previous cycle from the work start time of the next cycle to calculate the time of one cycle A work / non-work line in which the work start time and work end time of each load in the injection molding process correspond to each unit according to the signal from the unit and the microcomputer control unit of the injection molding machine. And a display device for displaying the working time of each load process, the load process switching time and the time of one cycle based on the calculation result of the central processing unit. It is a thing. As a result, as shown in item 3, the on / off operation status of each load can be displayed by analog display and digital calculation time, which is useful for studying cycle shortening and leaves the best operation molding record for each load. It can also be used for the next molding. Also, the work start time and work end time of each load in the injection process are displayed directly on the display screen from the output of the microcomputer control device of the injection molding machine, so that it is possible to display accurate time. Therefore, the circuit configuration can be simplified.

[Brief description of drawings]

The drawings are all for explaining the method of displaying the load operation of the injection molding machine according to the embodiment of the present invention. FIG. 1 is a plan view of the injection molding machine, and FIG. Block diagram of the control device, FIG. 3 is an example of a display screen,
FIG. 5 is a flowchart for explaining generation of a display screen for a certain load, and FIG. 5 is a display screen for explaining an example of the effect of the present invention. (1) …… Injection molding machine, (2) …… Clamping device (3) …… Heating cylinder, (4) …… Hopper (5) …… Drive controller, (6) …… Operating panel (7) ...... Display unit (9) ...... Microcomputer type control unit (10) ...... Central processing unit (CPU) (11) ...... ROM memory, (12) ...... RAM memory (13) (14) ...... Input / output Interface (15) …… output device, (16) …… output buffer (17) …… tact pulse generator (18) …… minute period, (19) …… counter (20) …… storage device, (20a) RAM1 (20b) RAM2 (22) key (s) output signal

Claims (4)

[Claims] 1. An XY coordinate is set on a screen of a display device,
With the X-axis of the XY coordinates as the time axis, injection molding load names are set in order along the Y-axis, and the operating line for each load is set parallel to the X-axis, and the microcomputer controller of the injection molding machine is set. A method for displaying the load output of an injection molding machine, characterized in that the work start time and work end time of each load of the injection process are displayed on the work line corresponding to each load by the output of 1. 2. The operation line and the non-operation line for each load are set parallel to the X-axis according to claim 1, and a time zone corresponding to a work start time to a work end time of each load is set on the operation line. The method for displaying a load output of an injection molding machine according to item 1, wherein the corresponding time zone is displayed on the non-operation line between the work end time and the next work start time. 3. The work time in the same load process is calculated by subtracting the work start time from the work end time in the same load process according to claim 1 or 2, and when moving from the preload process to the next load process. The work end time of the preload process is subtracted from the start time of the next load process to calculate the load process switching time, and the work time and the load process switching time are digitally displayed, respectively, and the work start time of the next cycle is compared to the previous cycle. The load output display method for an injection molding machine according to item 1 or 2, wherein the work start time is subtracted to digitally display the time of one cycle. 4. A storage device for storing the work start time of each load and the work end time of each load in the injection molding process in accordance with a signal from the microcomputer controller of the injection molding machine, and each storage of the storage device is read, In the same load process, the work start time is subtracted from the work end time to calculate the work time. When moving from the previous load process to the next load process, the work start time of the next load process is changed to the work end time of the previous load process. A central processing unit for calculating the load process switching time by subtracting from the current cycle, and subtracting the work start time of the previous cycle from the work start time of the next cycle to calculate the time of one cycle;
In accordance with a signal from the microcomputer controller of the injection molding machine, the work start time and work end time of each load in the injection molding process are displayed on the work / non-work line corresponding to each load in a 1-0 diagram, and the center is displayed. A load output display of an injection molding machine, characterized by comprising a display device that numerically displays the working time of each load process, the load process switching time, and the time of one cycle based on the calculation result of the processing unit. Method.