JPH05269816A - Controlling method for molding machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a molding machine with excellent safety in which the molding machine itself determines the noise level and automatically performs safety countermeasure processing. [Structure] When a noise sensor 6a arranged near the power supply line of a power source section of a molding machine (machine) detects a noise value of a predetermined level or lower, which is lower than a noise resistance value that the molding machine can withstand, the microcomputer 4 is operated by the microcomputer 4 To stop the supply of the power supply voltage to the driver group 7 for at least the drive source (hydraulic drive source or electromagnetic drive source) to make each mechanism of the machine inoperable, and to stop the emergency. The fact that the factor is noise is stored in the memory 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a molding machine such as an injection molding machine or a die casting machine, and more particularly, a microcomputer (hereinafter, referred to as a microcomputer) that controls the entire machine (molding machine) is noisy. The present invention relates to a control method for a molding machine, which automatically takes safety measures against.

[0002]

2. Description of the Related Art Recent molding machines such as injection molding machines are designed to automatically perform continuous molding operation under microcomputer control. Therefore, EMI (ELECTROMAGNETIC INTERFERENCE:
Various noise countermeasures are taken in order to prevent the machine (molding machine) during the molding operation from being adversely affected by noise represented by electromagnetic interference. Then, in the qualification test before shipping the machine, the machine is subjected to noise to perform a noise resistance test, and if a malfunction does not occur due to noise up to a certain level, it is certified that the machine has a predetermined noise resistance value. (I passed the noise resistance test).

The noise level (noise tolerance value) that the above-mentioned machine can withstand depends on the manufacturer of the machine at the present time, but the environment in which the machine is installed greatly differs depending on the factory (field) where the machine is installed. It is generally set to withstand a considerably large noise level higher than the expected noise level.

[0004]

As described above, the noise level that a machine (molding machine) can withstand is set to such a value that the machine does not malfunction in an environment that can be normally assumed. There is a limit to the improvement of the noise resistance of (1) due to cost and other factors (there is a limit to the improvement of the noise resistance). For this reason, for example, in an environment where old industrial machines that generate a very high level of noise, which is not normally considered, are installed near the molding machine, or at a very high level that suddenly occurs (has arrived). Noise (for example, noise from high-power radio waves from illegal CB radios from running cars, noise from lightning discharge or atomic bombs, etc.) may cause the molding machine to malfunction. It has been pointed out that there is a risk of damage to the product and may lead to a personal injury in some cases, and there has been a demand for immediate safety measures from the viewpoint of product liability (PL).

Further, since noise is invisible, it is difficult to grasp the environment of the factory where the machine (molding machine) is installed, and there is a malfunction of the machine (molding machine), and it is considered that this factor is not present in the machine. In addition, the current situation is that service engineers and others are observing noise around the machine with a measuring instrument for the first time and taking countermeasures, and some improvement was necessary for safety measures. Of course, it is possible to measure noise around the machine before installing the machine (molding machine), and take countermeasures, but it is impossible to deal with the above-mentioned extremely high level noise that suddenly arrived. It cannot be expected that users or sellers in all countries will observe noise around the machine and take countermeasures before installation. Furthermore, in this kind of machine (molding machine), if there is a malfunction, if this is unacceptable, the machine is automatically brought to an emergency stop, but this is due to the machine itself in the first place. There is also a problem that it is not possible to accurately determine after the fact whether it is a malfunction or a sudden high-level noise.

The present invention has been made in view of the above points,
An object of the invention is to provide a molding machine excellent in safety in which the molding machine itself determines a noise level and automatically performs a safety measure process. Another object of the present invention is to be able to accurately determine whether or not the machine is due to noise when the machine is brought to an emergency stop.

[0007]

In order to achieve the above-mentioned object, the present invention provides a microcomputer built in a molding machine, in which each part of the molding machine is operated based on various operating condition data set and measurement information from each sensor. In the control method of the molding machine, which has at least an automatic operation control function for driving and controlling, and an abnormality diagnosis function for monitoring and diagnosing an abnormality occurrence based on measurement information from each sensor, the noise level is detected as the sensor. When a noise sensor is provided, and the noise sensor detects a noise value exceeding a predetermined level lower than the noise proof value that the molding machine can withstand (for example, if the noise proof value that the molding machine can withstand is 2000V). Then, when the rise value of about 2000 × (80 to 95%) V or more is detected), the microcomputer makes an emergency stop of the operation of the molding machine. The factors are the effect was noise, to be stored in memory.

[0008]

A noise sensor disposed near the power supply line of the power supply section of the molding machine (machine) causes noise of a predetermined level (for example, 1800V) or more lower than the noise resistance value (for example, 2000V) that the molding machine can withstand. When the value is detected, the microcomputer stops the machine in an emergency and at least stops the power supply to the driver group for the drive source (hydraulic drive source or electromagnetic drive source) and puts each machine mechanism in an inoperable state. The fact that the cause of the emergency stop is noise is stored in the memory.

By doing so, before the molding machine (machine) malfunctions due to noise, the machine itself automatically puts the machine in an inoperable state, so there is no risk of the machine malfunctioning due to noise. It is possible to realize a molding machine with high safety. Further, since the fact that the cause of the emergency stop is noise is stored in the memory, it is possible to accurately determine whether or not the cause of the emergency stop of the machine was due to noise.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 is a block diagram showing an outline of an injection molding machine to which the control method according to the present invention is applied. In the figure, an injection molding machine generally indicated by reference numeral 1 is a mechanism system such as a known mold opening / closing device 2 and an injection device 3, a microcomputer 4 that controls the entire machine, and a power supply device that supplies electric power to each part. 5, the microcomputer 4 refers to the preset operating condition value and the measurement information from the sensor group 6 arranged in each part of the machine by the automatic molding operation program, A mechanism system is driven and controlled via a driver group (driving circuit group of each mechanism) 7. Reference numeral 8 is a key input device which is an input operation means for the microcomputer 4, and 9 is a display device which is a color CRT display for displaying processing results by the microcomputer 4. In this embodiment, a noise sensor 6a is provided as a sensor included in the sensor group 6,
The noise sensors 6a are provided in a required number in the vicinity of the power supply line of the power supply device 5 or the like so that the EMI noise or the like can be detected. This noise sensor 6
As a, a required part (electric field / magnetic field measurement probe or detection signal processing circuit) of a noise observation device called a commercially available EMI noise sensor or power line observation device may be taken out and used. You may purchase and make a probe etc.

Actually, the microcomputer 4 has various I / Os.
It is equipped with an interface, a main control program and a ROM that stores various fixed data, a RAM that reads and writes various flags and measurement data, and a CPU that controls the entire system, and executes various processes according to various programs created in advance. However, in the present embodiment, for convenience of description, the molding condition setting storage unit 10 and the molding process control unit 1 are provided.
1, measured value storage unit 12, abnormality determination data storage unit 13, abnormality diagnosis unit 14, display control unit 15, alarm information storage unit 1
The following description will be given on the assumption that a functional unit such as 6 is included.

The molding condition setting storage unit 10 stores various molding condition values input by the key input means 8 or other appropriate input means in a rewritable form. The molding conditions include, for example, the relationship between the screw position and the screw rotation speed and back pressure during the charging process,
Suck-back control conditions, subdivided injection speed conditions from injection start position to holding pressure switching point (position) (primary injection stroke), subdivided holding pressure from holding pressure switching time to holding pressure end time Conditions, temperature of each part, mold closing stroke and speed, mold clamping force, mold opening stroke and speed, eject control conditions and the like can be mentioned.

The molding process control unit 11 fetches the measurement information from the sensor group 6 in real time based on the molding process control program created in advance and the setting condition values stored in the molding condition setting storage unit 10. Drive control of each corresponding drive source via the driver group 7 (motor driver, control valve driver, heater driver, etc.) while referring to the information from the measured value storage unit 12 and the clocking information from the clock built in itself. Then, a series of molding steps are executed.

In the measured value storage unit 12, all measured values of preset monitor items during continuous automatic operation are fetched and stored for a predetermined number of consecutive shots. .. The monitor items to be taken in are roughly classified into a time monitor item, a position monitor item, a rotation speed monitor item, a speed monitor item, a pressure monitor item, a temperature monitor item, and an electric power monitor item. The noise sensor 6a
Noise value data due to is also captured and stored.

The abnormal judgment data storage unit 13 stores abnormal events, abnormal numerical values, etc., which have been case-studied in advance. Then, the abnormality diagnosing unit 14 always takes in the data of the molding condition setting storage unit 10, the data of the actual measurement value storage unit 12, and the like, refers to the contents of the abnormality determination data storage unit 13, and the abnormality does not occur. Whether or not it is automatically determined. When the abnormality diagnosing unit 14 recognizes the occurrence of an abnormal situation, an alarm sound is generated by an alarm sound generator (not shown), for example, and when it is determined that the content of the abnormality is equal to or higher than a predetermined level, this is indicated. A signal is output to the molding process control unit 11 to cause the molding process control unit 11 to make an emergency stop of the machine. If the abnormality diagnosis unit 14 determines that an abnormal situation has occurred, the abnormal item,
All of the abnormal numerical value data is the alarm information storage section 16
Stored in.

In the present embodiment, the abnormality diagnosing unit 14 is provided with a noise level judging unit 14a, and the noise level judging unit 14a is always provided with the noise data measured by the noise sensor 6a and the abnormality judging data storage unit 13. In comparison with the noise allowable value data stored / set in the current disturbance noise, the current disturbance noise has a predetermined level (for example, 1 V) less than the noise resistance value (for example, 2000 V) that the molding machine (machine) can withstand.
It is determined whether the voltage exceeds 800V). Then, the actually measured noise data by the noise sensor 6a is 1800 above.
When the voltage exceeds V (for example, when the pulse surge voltage due to noise exceeds 1800 V), the noise level determination unit 1
4a (abnormality diagnosing section 14) sends a stop command to the molding process control section 11 to prevent the machine from erroneously operating in order to stop the machine urgently. Further, in this embodiment, when the noise exceeds a predetermined level and the operation of the machine is urgently stopped, a control signal is sent from the abnormality diagnosing unit 14 to the power supply device 5, whereby at least the driver group 7 is provided. The power supply to the machine is stopped and each mechanism of the machine is put into an inoperable state to improve safety. Further, in the present embodiment, when the machine is urgently stopped by the noise detection, the power supply to the display device 9 and the like is also stopped so that only the function of the microcomputer 4 in the abnormal mode is activated.

The above-mentioned predetermined level (noise level for stopping the machine) lower than the noise resistance value that the molding machine (machine) can withstand can be set arbitrarily, but if it is much smaller than the noise resistance value of the machine. Since the machine frequently stops and a noise immunity value of the machine is approached to the limit as much as possible, there is a risk of malfunction, so in this embodiment, noise immunity value × (80 to 95%) or more When the value is detected, the machine is brought to an emergency stop.

When the abnormality diagnosing unit 14 determines that an abnormal situation has occurred as described above, the alarm information storage unit 16 stores this abnormality information (information about noise detection at a predetermined level or higher). In the present embodiment, the alarm information storage unit 16 employs a non-volatile memory or a battery-backed RAM,
Even if the power supply to all electric systems including the microcomputer 4 is cut off, the history of abnormalities (alarm information) can be saved. The reason for this is that, as described above in the present embodiment, when the noise exceeds a predetermined level and the operation of the machine is stopped urgently, the power supply to the driver group 7 is stopped to improve the safety. However, in order to further enhance safety, there is a demand to completely stop the function of the microcomputer 4 in order to prevent runaway of the microcomputer 4 itself, or when the entire electrical system of the machine has died due to a power outage or the like. This is also for saving the history of abnormalities (alarm information).

The display control unit 15 extracts data from the molding condition setting storage unit 10 and the measured value storage unit 12 as necessary in response to an image call command by an operator's appropriate key operation, and extracts the data from the numerical image data or graphic data. These are converted into image data, and fixed data (for example, symbol / unit data, ruled line data, simplified graphic data, etc.) to be used for the image display is extracted from an image display fixed data storage unit (not shown), and these Are combined to generate image data desired by the operator and displayed on the display device 9. Further, at the time of occurrence of an abnormal situation, when power is being supplied to each electric system including the display device 9, an alarm signal from the abnormality diagnosis unit 14 arrives to cause a corresponding abnormal item from an alarm message storage unit (not shown). Message information is extracted, converted into image data, and an alarm message is forcibly displayed on the display device 9. When the power supply to the display device 9 is cut off (main power is turned off) due to the occurrence of an abnormal situation, after the main power is turned on by the operation of the operator, the latest abnormality is stored in the alarm information storage unit 16. The information data is extracted, alarm data is generated based on the extracted information data in an alarm message storage unit (not shown), and the alarm image data is displayed on the display device 9.

Next, the noise level determination by the microcomputer 4 during the automatic molding operation and the processing related thereto will be described with reference to the flowchart of FIG. In step ST1 of FIG. 2, the measured value from the noise sensor 6a is
It is asked whether or not a predetermined level lower than the noise tolerance value of the machine is exceeded. If YES, the process proceeds to step ST2, and if NO, the process proceeds to step ST7 to continue the automatic molding operation. In step ST2, since the detected noise exceeds a predetermined level, noise safety countermeasure processing is executed, an alarm sound is output to cause an emergency stop of the machine, and data indicating that the noise exceeds a predetermined value (noise abnormality is indicated). The data and the noise numerical data) are stored in the alarm information storage unit 16 with ID information (occurrence date and time data, etc.) stored therein. Power supply to the group 7 and the display device 9 is stopped (main power is turned off). In step ST3 subsequent to step ST2, it is asked whether or not the main power source is turned on by the operator's manual operation, and YE
If S, go to step ST4; if NO, go to step 3
The process of is repeated. In step ST4, the latest abnormality information data, that is, noise abnormality information data, is extracted from the alarm information storage unit 16, image data conversion processing is performed based on the extracted abnormality information data, and an alarm message is displayed on the display device 9, and the process proceeds to step ST5. move on. In step ST5,
It is asked whether or not safety has been confirmed and the operator has issued a command to restart the molding operation. If YES, step ST
If NO in step 6, the process returns to step ST4. Step S
At T6, the molding operation is restarted, the process proceeds to the next step ST7, the automatic molding operation is continued at step ST7, and the process proceeds to step ST8. In step ST8, it is asked whether or not molding of a predetermined number of shots has been completed (whether or not to terminate the automatic molding operation).

As described above, in this embodiment employing such a control method, the molding machine itself determines the noise level, and when the noise exceeds a predetermined level (until the noise reaches the nozzle proof value of the machine). Since the emergency stop is automatically performed (the safety measure process is automatically performed), it is possible to realize a molding machine excellent in safety in which the machine may not malfunction due to noise. Further, by using the molding machine of the present embodiment, it is possible to cope with sudden noise during the automatic molding operation, and of course, it is possible to measure the noise environment around the machine during the initial test operation during the installation of the molding machine. It is also possible to take noise environment measures before entering. Further, when the machine automatically stops in an emergency, it is possible to accurately determine whether this is a malfunction caused by the machine itself or a sudden high-level noise.

Although the present invention has been described above with reference to the illustrated embodiments, it goes without saying that various modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Processing by detection noise is graded according to the noise level, and when a medium level noise is detected, an alarm and an alarm message are output to continue automatic operation, and when a large level noise is detected, You may make it perform the process by the Example mentioned above.

[0023]

As described above, according to the present invention, it is possible to provide a molding machine excellent in safety in which the molding machine itself judges the noise level and automatically performs the safety countermeasure process. In addition, when the machine makes an emergency stop, whether or not it is due to noise can be accurately determined after the fact.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part of an injection molding machine to which a control method according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing an example of a processing flow of a microcomputer of an injection molding machine according to an embodiment of the present invention.

[Explanation of symbols]

 1 Injection Molding Machine (Machine) 2 Mold Opening Device 3 Injection Device 4 Microcomputer (Microcomputer) 5 Power Supply Device 6 Sensor Group 6a Noise Sensor 7 Driver Group 8 Key Input Device 9 Display Device 10 Molding Condition Setting Storage Unit 11 Molding Process Control Unit 12 measured value storage unit 13 abnormality determination data storage unit 14 abnormality diagnosis unit 14a noise level determination unit 15 display control unit 16 alarm information storage unit

Claims (4)

[Claims] 1. A microcomputer incorporated in a molding machine has an automatic operation control function for driving and controlling each part of the molding machine based on various set operating condition data and measurement information from each sensor, and from each sensor. In a molding machine having at least an abnormality diagnosis function for monitoring and diagnosing an abnormality occurrence based on the measurement information, etc., a noise sensor for detecting a noise level is provided as the sensor, and the noise value above a predetermined level is provided by the noise sensor. The control method of the molding machine, wherein the microcomputer is configured to make an emergency stop of the operation of the molding machine when is detected. 2. The method for controlling a molding machine according to claim 1, wherein the noise value at a level at which the operation of the molding machine is stopped urgently is a predetermined value less than a noise resistance value that the molding machine can withstand. .. 3. The method of controlling a molding machine according to claim 1, wherein when the emergency stop is performed, the abnormality factor information is stored in a memory. 4. The memory according to claim 3, wherein the memory is
A method for controlling a molding machine, which is a nonvolatile memory or a battery-backed RAM.