JPS6255480B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a control device for a press automation line using a program control system, and in particular, when the initial conditions for starting press operation are inadequate or when a malfunction occurs for some reason, the progress of the program is stopped and the program is stopped. This invention relates to a control device for a new press automation line that can indicate the details of inadequate initial conditions and malfunctions by numerically displaying the steps being executed when the press is stopped.

[Conventional technology]

In order to start operation of a press machine, many check points must be in a normal state as an initial condition, and many check points must be in a normal state in order to continue operating a press machine. must be maintained. As press machines become more automated, the number of checkpoints in each part of the system increases, and multipoint scanners, for example, are used to monitor these many checkpoints. A multipoint scanner scans a large number of sensors installed at various checkpoints at high speed, and when an abnormality is found, it displays the abnormality.

[Problems to be solved by the invention]

Now, when monitoring the condition with a multi-point scanner like the one mentioned above, it is necessary to increase the scanning speed as the number of check points in each part of the press machine increases, and the multi-point scanner itself becomes expensive. At the same time, a problem arises in the reliability of the multipoint scanner itself. Furthermore, even if the scanning speed of the multipoint scanner itself is sufficiently fast and reliable, the response speed of the sensors placed at many checkpoints may not be sufficient to accommodate this. As a result, the scanning speed cannot be increased unless the sensor itself has adequate measures against chattering and other noise-generating factors. In some cases, there is a risk that only incidental noise components will be extracted as detection data, and these many sensors will also be expensive. In addition, as the number of checkpoints in each part of the system increases with the automation of press machines, the initial conditions that must be prepared to start press operation become more complex. There is also a growing desire for workers to learn the initial conditions.

[Means to solve the problem]

The present invention was made in view of the current situation, and in order to start the operation of the press machine, it is necessary to monitor that each part of the press machine is complete with the initial conditions specified by the program, and to start the operation of the press machine. To provide a control device for a press automation line that progresses the steps of a control program while monitoring that each part of a press machine is in the normal state specified by the program even while the machine is in operation. In particular, it does not require a high-speed, high-precision multi-point scanner, and allows workers to easily learn the initial conditions for starting press machine operation while actually operating the press machine. The purpose of this invention is to provide a new control device for a press automation line that is similar to the above. In order to achieve the above object, the press automation line control device of the present invention has the following means. First, it has a storage device that stores an operation program for the press machine, and an arithmetic device that sequentially reads the program from the storage device step by step and sequentially controls a plurality of control target parts arranged in each part of the press machine step by step. The premise is a control device for a program-controlled press automation line. A plurality of sensors associated with each of the plurality of control target members and detecting a state of the control target member are connected to an input section of the arithmetic device. A display for numerically displaying the progress steps of the program is connected to the output section of the arithmetic unit. The arithmetic unit is provided with a comparison means for comparing the state of a sensor that detects the state of the controlled member specified by the step currently being executed among the plurality of sensors and the state currently being carried out by the step. . The progress of the program is stopped until the comparison means detects a match, and the step currently being executed is numerically displayed on the display.

[Effect]

That is, in the present invention, the program is read out from the storage device by the arithmetic unit in step order and executed, and the step currently being executed is displayed numerically on the display. Furthermore, as each step of the program progresses, the comparison means provided in the arithmetic unit compares the state of the sensor installed on the controlled member specified by the step currently being executed. The progress of the program is stopped until the two match. Therefore, in the process of progressing through the steps of a program, if there is a deficiency in the initial conditions for starting operation, the progress of the program will be stopped until the incomplete initial conditions are met, and the current step will be displayed. Since the numerical value is displayed on the instrument,
It is possible to recognize locations where deficiencies in initial conditions have occurred. Similarly, if a malfunction occurs during automatic operation while progressing through the steps of the program, the program will stop progressing until the cause is removed, and the step at that time will be displayed numerically on the display. Since the information is displayed, the location of the malfunction can be recognized.

【Example】

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. First, numeral 1 is a storage device that stores programs, and numeral 2 is an arithmetic device that sequentially reads out the programs prestored in the storage device 1 in order to control the press machine, monitor its condition, or control the display of abnormal locations. It is. Note that details of the arithmetic device 2 will be described later. Further, 3 indicates an output unit, 4 an input unit, and 6 a display output unit. The output unit 3 acts as an output interface between the arithmetic unit 2 and the press machine that is the controlled device, and includes, for example, a large number of relays 31 driven by switching transistors.
~3N as an example of an output point, and connected to the AC100V line through contacts ₃₁ ~ _3o that operate in conjunction with relays 31~3N, such as a solenoid valve 9 and automatic Operation indicator light 8 etc. is activated. Furthermore, the input unit 4 acts as an input interface between the arithmetic device 2 and the press machine which is the controlled device, and is used to control the sensors 41 to 4N provided in each part of the press machine, the automatic operation button 5, etc. The bit input of the DC5V line suitable for the arithmetic unit 2 is turned on and off by contacts ₄₁ to _4o and contact 5', which operate in conjunction with the relays that are energized and demagnetized by make and break. . In addition, in this embodiment, the above-mentioned sensors 41 to 4
N is arranged corresponding to relays 31 to 3N serving as output points. More specifically, if the solenoid valve 9 operated by the relay 3N is a solenoid valve for clamping/unclamping the mold, the sensor 4N is constituted by a proximity switch, for example, and It is placed at a location where it can detect clamping and unclamping. Further, the display output unit 6 is constituted by a group of transistor drivers for driving decoders 71 and 72 of the display device 7. The base of each transistor driver receives numerical information from the arithmetic unit 2.
It is given as a BCD code, and depending on whether this BCD code is turned on or off, the transistor driver is turned on or off, and its collector is connected to the decoders 71 and 72.
becomes the input signal. And decoders 71, 72
decodes the output of the display output unit 6 and displays numerical values on display panels 73 and 74. Note that when displaying a two-digit numerical value, the output display unit 6 will have eight transistor drivers. Now, the arithmetic device 2 will be explained in detail. As described above, the arithmetic unit 2 is used to sequentially read the program stored in the storage device 1 in step order and control the press machine, monitor its condition, and display abnormalities. The arithmetic device 2 performs normal program control in that it controls each part of the press machine by sequentially reading out the program stored in the storage device 1 and giving control signals to the output unit 3. It has a function as a calculation device. Furthermore, as a characteristic feature of the present invention, the arithmetic device 2 detects the state of a sensor provided for detecting the state of the controlled member specified by the step currently being executed among the plurality of sensors. has a logical comparison means for logically comparing the state of this sensor with the state specified by the step currently being executed, and detects the state of the controlled member specified by the step currently being executed. The progress of the program is stopped until the state of the sensor provided for the step reaches the state specified by the step currently being executed. Furthermore, as a characteristic feature of the present invention, when the arithmetic unit 2 sequentially reads out the program stored in the storage device 1 step by step and provides a control signal to the output unit 3, it reads out the step currently being executed. A numerical signal indicating the step is sent to the display output unit 6, and the step currently being executed is displayed numerically on the display device 7. Next, the operation of the embodiment shown in FIG. 1 will be explained with reference to the above matters and the flowcharts of FIGS. 2 and 3. In addition, in an automated press line, it is difficult to explain all the initial conditions that must be satisfied for the start of operation and all the procedures from the start of automatic operation to the end of automatic operation. Therefore, in the following, two points are specified as part of the initial conditions for starting operation: (1) the slide is stopped at the top dead center, and (2) the mold is clamped. A press line in which the mold is unclamped during automatic operation before the automatic operation ends will be explained as an example. First, automatic operation is started by pressing the automatic operation button 5 after power is turned on. After the power is turned on, the arithmetic device 2 reads out the program stored in the storage device 1 step by step. In the first step of the program, the content "detection of automatic operation button 5 being turned on" is specified, and the arithmetic unit 2 monitors the state of the contact 5' corresponding to the automatic operation button 5 in the input unit 4, The progress of the program is stopped until the state of contact 5' becomes the on state specified by the step currently being executed. Then, the arithmetic device 2 sends the number "1" of the step currently being executed to the display output unit 6, and "1" is displayed on the display panel 73. The meanings of the numerical values displayed on the display panels 73 and 74 are shown in, for example, the operation manual, and when "1" is displayed on the display panel 73, the operator can press the automatic operation button 5. I know that I am in a state where I am waiting for something to happen. When the operator presses the automatic operation button 5, the relay connected to the automatic operation button 5 is activated, and the contact 5' in the input unit 4 that is linked to this is made. When contact 5' is made, the state specified by the step currently being executed in the program has occurred, so when contact 5' is made, arithmetic unit 2 sends a control signal to output unit 3. By making contact 3 _o-1 and lighting the automatic operation indicator light 8, the operator is informed that automatic operation has started, and the program step is advanced. That is, the arithmetic device 2 reads out the second step of the program stored in the storage device 1 and executes it. In the second step of the program, "detection of top dead center stop of slide" is specified as one of the initial conditions for starting automatic operation. Now, assuming that the sensor 41 is assigned to detect the top dead center, the arithmetic device 2 monitors the state of the contact 41 corresponding to the sensor ₄₁ for detecting the top dead center in the input unit ₄ , and If the state is on, which is the state specified by the step currently being executed, the program step advances. If the state of the contact ₄₁ is not the on state specified by the step currently being executed, the processing unit 2 stops the progress of the program until it becomes the on state, and also records the number of the step currently being executed. "2" is sent to the display output unit 6, "2" is displayed on the display panel 73, and at the same time, the automatic operation indicator light 8 is turned off according to FIG. When "2" is displayed on the display panel 73, the operator knows that automatic operation has been stopped because the press line has not stopped at the top dead center, which is one of the initial conditions for starting operation. . Therefore, the operator manually stops the press at the top dead center and presses the automatic operation button 5 again, and when the automatic operation button 5 is turned on, the automatic operation indicator light 8 lights up. Further, when the top dead center is stopped by manual operation, the sensor 41 is closed, and the contact ₄₁ is closed. When contact ₄₁ is made, the state specified by the step currently being executed in the program (i.e., the second step) has occurred, so when contact ₄₁ is made, arithmetic unit 2 executes the step in the program. Proceed. That is, the arithmetic device 2 reads out the third step of the program stored in the storage device 1 and executes it. In the third step of the program, "detection that the mold is clamped" is specified as one of the initial conditions for starting automatic operation. Now, assuming that the sensor 4N is assigned to detect clamping/unclamping of the mold, the arithmetic unit 2 monitors the state of the contact 4n corresponding to the clamping/unclamping detection sensor 4N in the input unit 4, If the state of the contact 4n is on, which is the state specified by the step currently being executed, the step of the program is advanced. If the state of the contact 4n is not the on state specified by the step currently being executed, the arithmetic device 2 stops the progress of the program until the contact 4n becomes the on state, and also sets the number of the step currently being executed. 3" is sent to the display output unit 6, "3" is displayed on the display panel 73, and at the same time, the automatic operation indicator light 8 is turned off according to FIG. When "3" is displayed on the display panel 73, the operator knows that automatic operation has been stopped because the press line has not been clamped, which is one of the initial conditions for starting operation. Therefore, the operator manually clamps the mold and presses the automatic operation button 5 again, and when the automatic operation button 5 is turned on, the automatic operation indicator light 8 lights up. Further, the sensor 4N is made by manually operated mold clamp, and the contact point 4n is made. The making of this contact 4n means that the state specified by the step currently being executed in the program (ie, the third step) has occurred, so when the contact 4n is made, the arithmetic unit 2 advances the step of the program. After all initial conditions are confirmed in the same manner, automatic operation of the press line is started. Further, after the automatic operation starts, the automatic operation is completed by sequentially executing all predefined steps. Now, assume that the mold is unclamped as the 26th step during automatic operation, and the automatic operation is ended by subsequently executing the 27th and subsequent steps. When the 25th step is completed during automatic operation, the arithmetic unit 2 reads the 26th step of the program from the storage device 1 and executes it. In the 26th step, the content of "unclamping the mold" is specified, and the arithmetic unit 2 demagnetizes the relay 3N, which is the output point of the output unit 3, breaks the contact 3n, and controls the solenoid valve 9 to unclamp the mold. Operate in the unclamp direction. Further, the arithmetic unit 2 stops the program from proceeding until the state of the contact point 4n corresponding to the clamp/unclamp detection sensor 4N in the input unit 4 becomes the OFF state, which is the state specified by the step currently being executed. At the same time, the number "26" of the step currently being executed is sent to the display output unit 6, and "26" is displayed on the display panels 73 and 74. As long as the clamp/unclamp mechanism of the mold is operating normally, the mold will be unclamped, and with the unclamping operation, the sensor 4N for clamp/unclamp detection will break, and in conjunction with this, the contact 4n will break. do. Then, when the arithmetic unit 2 confirms that the contact 4n has broken, it advances the step of the program. On the other hand, if a trouble occurs in the clamping/unclamping mechanism of the mold for some reason and the unclamping operation is not performed, the contact 4n will not break, so the arithmetic unit 2 will
The program will stop progressing while displaying “26”. Therefore, since the press line stops at that point, it is possible to prevent a disaster caused by continuing operation of the press line without unclamping the mold. In addition, if the progress of the program is stopped without unclamping the mold, the display panel 7
Since the number "26" remains displayed at 3 and 74, the operator can know from this number that the automatic operation has been stopped because the mold was not unclamped. In this way, after recognizing that the cause of the press line stopping was due to the mold not being unclamped, we remove the cause and unclamp the mold manually. Sensor 4 for clamp/unclamp detection
N breaks, and correspondingly, contact 4n breaks. Then, due to the break of the contact point 4n, the currently executed step (i.e., the 26th step) satisfies the specified condition, so the arithmetic unit 2 advances the program steps to the 27th step and thereafter, and in the same manner, all steps are executed. Execute to end automatic operation.

【effect】

As explained above, the press automation line control device of the present invention employs a program control method that decodes a program read out step by step from a storage device and controls a plurality of control target members arranged in each part of a press machine. In the control device of the press automation line, the state of the control target member specified by the step currently being executed is detected by the sensor installed for the control target member, and the state of the control target member specified by the step currently being executed is detected. It allows the program to proceed while confirming that the step is in the specified state, and also displays the number indicating the step currently being executed. Therefore, according to the present invention, if the controlled object specified by the step currently being executed is not in the state specified by the step currently being executed due to insufficient initial conditions for starting operation, or If the control target member specified by the currently executing step is not in the state specified by the currently executing step due to a malfunction that occurs for some reason during automatic operation, the subsequent Since the progress of the program is stopped, it is possible to effectively prevent many disasters and troubles caused by automatic operation continuing with insufficient initial conditions or malfunctions. Furthermore, according to the present invention, when the progress of the program is stopped as described above, the number corresponding to the step being executed at that time is displayed, so that the initial step that was defective can be checked using this number. The contents of the conditions and the location where the malfunction occurs can be easily recognized. Further, according to the present invention, if the initial conditions for starting operation are inadequate, the progress of the program will be stopped as described above, but by removing the cause of the stop, the program will proceed again. Even if the initial conditions for the press are complicated, it becomes possible to operate the press while checking the initial conditions one by one while actually operating the press machine, making it easier to learn the complicated initial conditions. Furthermore, in the present invention, the monitoring operation performed to discover deficiencies in initial conditions or malfunctions is carried out by monitoring the steps currently being executed among sensors installed on a plurality of control target members disposed in each part of the press machine. The present invention compares whether the state of the sensor specified by the step matches the state required by the currently executing step. There is no need to instantaneously scan check points, and a sensor with a particularly fast response speed is not required.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
Figure 2 is a flowchart for autonomous driving, and Figure 3 is a flowchart for resuming autonomous driving. 1...Storage device, 2...Arithmetic unit, 3...Output unit, 31-3N...Output point, 4...Input unit, 41-4N...Sensor, 5...Automatic operation button, 6...Display Output unit, 7...display device,
71, 72... Decoder, 73, 74... Display panel.

Claims (1)

[Scope of Claims] 1. A storage device that stores an operating program for a press machine, and a program that reads the program from the storage device step by step to sequentially control a plurality of control target members arranged in each part of the press machine step by step. A control device for a program-controlled press automation line having a calculation device, wherein a plurality of sensors associated with each of the plurality of control target members and detecting a state of the control target member are connected to an input section of the calculation device. , a display device for numerically displaying the progress steps of the program is connected to the output section of the arithmetic device, and the arithmetic device is connected to a member to be controlled specified by the step currently being executed among the plurality of sensors. A comparison means is provided to compare the state of the sensor that detects the state of the step with the state specified by the step, and the progress of the program is stopped until the comparison means detects a match, and the step currently being executed is displayed on the display. A press automation line control device characterized by displaying numerical values.