JPH035123A - Central administrative control apparatus for injection molding machine - Google Patents

Abstract

PURPOSE:To perform a high reliable injection molding operation, and obtain high quality molded articles stably by detecting real process data during the injection operating period, and carrying out injection molding only when the data is judged normal in comparison with the normal data process, and plotting both data on a display unit. CONSTITUTION:Injection condition set data is plotted on a CRT display 112 as a set process waveform by means of an analysis part 110 of a central administrative control apparatus 100. Furthermore, a real process data during the normal operation period is collected by a process controller 210, and the tolerance is set with respect thereto, and then stored in a hard disc 115 as a normal process waveform. When injecting operation starts, a detector 120 plots the real process data, which is load into the analysis part 110 at predetermined sampling distances, and each time, the data is plotted as a real process waveform in superimposing it on the set process waveform, and then compared with the normal process waveform. In the case where the real injection speed or real injection pressure comes out of the tolerance of the normal process waveform, when it reaches the predetermined set number, abnormality is reported by issuing a warning, and the injecting operation is stopped thereby.

Description

[Detailed description of the invention] “Industrial application field” The present invention relates to a centralized management control device for an injection molding machine.

[Prior Art] Conventional centralized management control devices for injection molding machines are known to have the following functions.

■Download function to transfer molding condition data for each mold from the host computer to the molding condition controller of the field injection molding machine.

■Historical data that displays the actual process fluctuation measurement values of the injection molding machine from the molding condition controller to the post combination controller using the down time of the injection molding machine, and displays trends for each shot.・Trend function.

■Statistical quality analysis function that draws normal distribution charts based on historical trend data of stingrays, plots -R control charts, and calculates process capability indices.

■Waveform analysis function that collects and draws data for each shot process 1j↑ (especially injection pressure, injection speed, screw rotation speed, and cavity pressure) at each sampling time.

[Problems to be Solved by the Invention] However, in the prior art, the process amount of the injection molding machine during the injection operation is collected, but the collected process amount is not used as the process waveform corresponding to the injection IJ process. Since it only displays the process waveform, if there is a significant hole in the process waveform variation, the person monitoring it must be attentive to recognize the variation. Since this information is not notified, there is a possibility that molding will continue as it is, leading to the occurrence of defective molded products.

The present invention was made in view of the drawbacks of the conventional technique J+Fr, and is a centralized management control for injection molding machines that automatically recognizes process abnormalities in the injection molding machine and performs highly reliable injection molding. The purpose is to provide equipment.

"Means for Solving the Problems" Centralization of the injection molding machine of the present invention +1! a process data storage unit that stores normal process data corresponding to the injection condition setting data during normal injection operation of the injection molding machine based on the setting data; a detection unit that detects corresponding actual process data at a predetermined sampling interval; and a detection unit that compares the actual process data detected by the detection unit with the normal process data, and determines whether the actual process data is the actual process data or a preset allowable range of the normal process data. If it is outside the allowable range, the analyzer counts the number of times the injection is outside the allowable range, and when the number reaches a predetermined set number, an alarm is issued and the injection operation is stopped. Some devices include a display device on which four condition setting data and actual process data are drawn.

[Operation] Actual process data regarding the injection process of the injection molding machine during injection operation is detected at predetermined sampling intervals, and the detected actual process data is compared with normal process data during normal injection operation. As a result of this comparison, if the detected actual process data is outside the permissible range of the preset 1E process data, the number of times the detected actual process data falls outside the permissible range is counted, and the number of times it reaches the preset number of times is counted. If this occurs, it is determined that there is an abnormality in the injection molding machine, and an alarm is issued and the injection operation is stopped. Therefore, in the injection operation, injection molding is continued only when the detected actual process data is within the allowable range of normal process data.

It is also set by the process controller of the injection molding machine. By drawing the injection condition setting data, which serves as the reference for the injection operation, and the actual process data detected during the actual injection operation on the display device, it is possible to confirm the fluctuations in the process data due to the injection operation using the U1 view. .

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

This embodiment has a configuration in which a central management control device 100 having an analysis section 110, a detection section 120, and a field-side micro convenience store 130 monitors and controls an injection molding machine 200.

The analysis unit 110 of the central management control device 100 includes a host computer 111, a CRT display 112 which is a display device on which injection condition setting data and actual process data are drawn, a printer 113, a keyboard 114, and a storage device. It consists of a hard disk 115 and a floppy disk 116, and is installed at a host site such as a centralized control room.

Host computer] 11 is a floppy disk 116
(or the hard disk 115 may be transferred from the floppy disk 116), based on the indexing condition setting data set in the process controller 210 of the injection molding machine 200. Collect normal process data during normal operation of the injection molding machine 200, set a tolerance range for the normal process data and store it in an internal storage area, and also store the above-mentioned tunying process data in a normal state corresponding to the injection process. It is stored as a process waveform in the hard disk 115, which is a process data storage unit. Furthermore, the host computer 111 takes in the injection condition setting data set in the process controller 210 via the field-side microcomputer 130 and draws it on the CRT display 112 as a set process waveform corresponding to the n4 output process. The host computer 111 also sends the actual process data corresponding to the injection condition setting data detected by the detection unit 120 during the injection operation of the injection molding machine 200 to a predetermined San Francisco database via the field-side microcombiner JJ-controller 130. The actual process data captured at link intervals is overwritten as an actual process waveform on the set process waveform drawn on the CRT display 112, and the actual process waveform is transferred to the hard disk 115.
Compare with the normal process waveform stored in . As a result of the comparison, if the actual process data is outside the allowable range of the normal process data, the number of times the actual process data is out of the allowable range during the injection shot during operation is counted, and When a predetermined set number of times stored in the storage area of the host computer 111 is reached, an alarm is issued and the injection operation of the injection molding machine 200 is stopped.
Make it two.

The detection unit 120 of the central management control device 100 is a commercial luck A/D
It is composed of a converter 121 and sensor amplifiers 122 to 126, and is installed on the field side of the field where the injection molding machine 200h) is installed.

Sensor amplifiers 122 to 126 detect actual process data of the injection molding machine 200 during injection operation, and output data from 0 to 10VD.
Analog of C: Converts to I: and high-speed A/D converter 121
Output to. In this example, as actual process data,
Sensor amplifiers 122 to 126 (injection pressure, injection)
11 speed, screw position 1''i, screw rotation speed, and mold cavity pressure are detected.

The high-speed A/D converter 121 is connected to sensor amplifiers 122 to 12.
The analog quantity is converted into a digital quantity without showing the actual process data from 6, and the field side marker computer 3
Host combination 111 of analysis unit 110 via 0
Transfer to.

The field side microcontroller 130 of the centralized hazard control device 100 is installed on the field side, and is used for data transmission between the analysis section 110 and the injection molding machine 200, and for data transmission between the analysis section j10 and the detection section. It has an ink face function for data transmission to and from 120.

In the injection molding machine 200, the injection line ('l setting data) corresponding to the process jIi in the injection process is set in the process controller 210 in advance based on the data necessary to obtain a good product that has been cultivated through past experience. In this actual hh example, the temperature, injection speed, injection pressure, and screw rotation speed are set as the injection condition setting data, and these indexing condition setting data are the cylinder temperature controller old 220 and the mold temperature controller 23.
0 and the electromagnetic proportional control valve amplifier 240 to determine the injection conditions for each molding material and mold,
Based on the injection conditions, the cylinder heater 221, mold temperature regulator 231, and electromagnetic proportional control valve 241 are controlled to perform appropriate injection molding.

Next, the operation of this embodiment will be explained. 1 Here, the process controller 210 of the injection molding machine 200
Consider the injection speed setting data (VS) and the injection monthly force setting data (ps) in the injection condition setting data set in the following manner.

This process controller 210 (Zurumi 10) output speed setting data (V8) and injection pressure setting data (P
Setting S) is performed in the injection process for the speed control step from the injection start point to the pressure holding switching point and the pressure control step from the pressure holding switching point to the injection/pressure completion point.

First, in FIG. 2, the injection start position S. The period from to the holding pressure switching point S4 is a speed control process, and the injection speed and injection pressure are determined based on the injection speed setting data (V
S) and injection pressure setting data (ps) are set. In this embodiment, as shown in FIG. 2, the injection speed setting data (V S) is changed to the speeds V+, V2, V3, . The injection pressure setting take (P8) is set to a constant pressure P up to injection stroke S3, and is set to pressure P2 between injection strokes S3 and S4.

In addition, in Fig. 2, after the pressure holding switching point S4, the process switches to the pressure control process, and the injection speed setting data (VS) and injection pressure setting data (ps) are set in accordance with the passage of time. ing. In this example, the second
As shown in the figure, the injection speed is constant at speed v5 after the pressure holding switch, and the injection pressure is P as time passes (times t to t4).

p4. p6. It is set to change to p6.

Injection condition setting take Vs, Ps set as described above
is determined by the analysis unit 110 of the central management control device 100,
On the CRT display 112, as shown in FIG.
The waveform is drawn as a set process waveform corresponding to the injection process, that is, from the injection start position S0 to the holding pressure switching point S4 corresponding to the injection stroke, and from the holding pressure switching point S4 onward corresponding to time. Furthermore, the solution N part t 10 of the central management control device 100 includes actual process data corresponding to the injection condition setting data during normal operation of the injection molding machine 200 based on the injection condition setting data set by the process controller 210. Collect the actual process data, set a tolerance range for the actual process data, and set it to the hard disk as a normal process waveform corresponding to the injection process similar to the setting process waveform. 15
Store in.

Then, when the injection molding machine 200 starts the injection operation, the detection unit 120 of the central management control device 100 detects actual process data of the injection molding machine 200. In this case, in the detection unit 120, the sensor amplifiers 122 and 123
The actual process data, actual injection speed V8 and actual injection pressure P, are detected and output as analog values from O to IOV to the high-speed A/D converter 121, which then converts them into digital data. Convert to quantity. The actual injection speed ■8 and actual injection pressure Pa that have been converted into digital quantities are taken into the analysis section 110 at predetermined sample link intervals, and each time the
The actual process waveform is superimposed on the set process waveform being drawn on the RT display 112, and is compared with the normal process waveform stored on the hard disk 115. As a result of this comparison, if the actual injection speed Va or the actual injection pressure P8 falls outside the allowable range of the normal process waveform, the number of consecutive times that the actual injection speed Va or the actual injection pressure P8 falls outside the allowable range of π is counted, and even if the number of times is , when a predetermined set number of times is reached, an alarm is issued to report an abnormality in the injection molding machine 200, and the injection molding machine 200
stop the injection operation.

Further, in this embodiment, the normal process waveform stored in the hard disk 115 is used only for comparison with the actual process waveform, but it may be drawn on the CRT screen 112F in advance together with the set process waveform. In this case, it is possible to visually confirm the fluctuation status of the actual process waveform during actual operation with respect to the normal process waveform, and it is also possible to predict abnormal light I1-.

[Effects of the Invention] As explained below, the present invention detects actual process data during injection operation, compares it with normal process data, and performs injection molding only when the injection process in operation is determined to be normal. As a result, it is possible to prevent the occurrence of defective molded products, and a highly reliable injection molding operation can be performed, making it possible to stably produce high-quality molded products (4B-). In addition, by drawing the actual process data and set process data on the display device, changes in the set conditions of the injection process data during operation can be visually recognized, thereby preventing abnormalities in the injection molding machine. becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a centralized management control device for an injection molding machine according to the present invention, and FIG. 2 is a diagram showing an example of a drawing form of process waveforms. DESCRIPTION OF SYMBOLS 100... Central management control device, 110... Analysis unit, 111... Host computer, 112... CRT display, 113... Printer, 114... Keychain, 115... Heart screen, 116... Floppy disk, 120... Detection unit, 121... High speed A/'D converter, 122-126
...senzaampf, 130...field side microcomputer, 20
0...Injection molding machine, 210...Floss controller, 220...Cylinder temperature controller, 221...Cylinder heater 230...Mold 7□υ control'', 231...Mold temperature regulator, 240...electromagnetic proportional control valve amplifier, 241...electromagnetic proportional control valve.

Claims (1)

[Scope of Claims] 1. The injection molding machine (200) is equipped with a process controller (210) in which injection condition setting data is set in advance, and the injection molding machine (200) is
); a process data storage unit (115) that stores normal process data corresponding to the injection condition setting data during normal injection operation of the injection molding machine (200); a detection unit (120) that detects actual process data at predetermined sampling intervals;
20) compares the detected actual process data with the normal process data, and if the actual process data is outside the permissible range of normal process data set in advance, counts the number of times it falls outside the permissible range, and calculates the number of times the actual process data falls outside the permissible range. A centralized management control device for an injection molding machine, comprising an analysis section (110) that issues an alarm and stops the injection operation when a predetermined set number of times is reached. 2. The centralized management control device for an injection molding machine according to claim 1, further comprising a display device (112) on which injection condition setting data and actual process data are drawn.