JP6731994B2 - Abnormality detection device, control method of abnormality detection device, control program, and recording medium - Google Patents

Description

The present invention relates to an abnormality detection device and the like for detecting an abnormality in a scrap shooter of a press machine.

Conventionally, a press machine discharges scraps generated by press working through a scrap shooter. However, scrap is not always properly discharged to the scrap shooter, and clogging may occur. If the scrap shooter becomes clogged, scrap will accumulate and eventually the press will stop.

Therefore, Patent Document 1 describes a scrap discharging device that suppresses clogging of a scrap shooter by providing a structural protrusion for controlling the attitude of scrap.

Further, Patent Document 2 describes a predictive maintenance system for a press machine that comprehensively maintains the press machine by detecting the state of each part of the press machine.

JP-A-2018-69300 (Published May 10, 2018) Japanese Patent Laid-Open No. 5-162000 (Published June 29, 1993)

However, the technique described in Patent Document 1 is intended to suppress clogging of the scrap shooter, and cannot detect clogging of the scrap shooter.

Further, the technique described in Patent Document 2 uses various sensors to prevent failures, but does not describe a scrap shooter.

One aspect of the present invention has been made in view of the above problems, and an object thereof is to realize an abnormality detection device or the like that can detect an abnormality of a scrap shooter by a simple process.

In order to solve the above problems, an abnormality detection device according to an aspect of the present invention is an abnormality detection device that detects an abnormality in a scrap shooter of a press machine, and measures the flow rate of air supplied to the scrap shooter. It is characterized by comprising an acquisition unit for acquiring a value and an abnormality determination unit for determining an abnormality of the scrap shooter based on the measured value.

According to the above configuration, since the abnormality of the scrap shooter can be detected based on the measured value of the flow rate of the air supplied to the scrap shooter, the abnormality can be detected by a simple process.

In the abnormality detection device according to one aspect of the present invention, the abnormality determination unit determines that the scrap shooter has an abnormality when the amount of change in the measured value in the first predetermined period is smaller than a first threshold value. It may be one that does.

According to the above configuration, since it is possible to determine the abnormality of the scrap shooter by using the change amount of the air flow rate, it is possible to detect the abnormality of the scrap shooter with a simple process. The first predetermined period may be a period in which the amount of change in the air flow rate can be calculated appropriately, and is, for example, 1 second.

In the abnormality detection device according to one aspect of the present invention, the abnormality determination unit determines that the scrap shooter has an abnormality when the average value of the measured values in the second predetermined period is smaller than the second threshold value. It may be one.

According to the above configuration, it is possible to determine the abnormality of the scrap shooter using the average value of the air flow rate. As a result, it is possible to properly detect an abnormality such that the air flow rate gradually changes. The second predetermined period may be a period in which the average value of the measured values can be calculated appropriately, and is, for example, 1 minute.

In the abnormality detection device according to one aspect of the present invention, the abnormality determination unit determines the number of cycles per minute from the waveform of the measured value, and the determined number of cycles in the third predetermined period is greater than the third threshold value. If it is also small, it may be determined that the scrap shooter has an abnormality.

According to the above configuration, the scrap shooter abnormality determination can be performed using the number of cycles determined from the waveform of the measured value. If it is normal, the number of cycles matches the number of cycles of the scrap shooter. Therefore, by using the number of cycles, it is possible to properly determine even if there is no visible change in the air flow rate. You can Note that the third predetermined period may be a period in which the number of cycles of the scrap shooter can be calculated appropriately, and is, for example, 30 seconds. Note that one cycle is processing of a scrap shooter corresponding to one shot in a press machine.

In the abnormality detection device according to one aspect of the present invention, the measurement corresponding to a predetermined number of shots from when there is at least one of a change in the die of the press machine and a change in a parameter for controlling the operation of the press machine. A threshold value setting unit that sets the first threshold value using a value may be provided.

According to the above configuration, the measured value for the predetermined number of shots is used from at least one of the die change of the press machine and the parameter change for controlling the operation of the press machine (so-called stage change). To set the first threshold. Thereby, the abnormality determination can be performed using an appropriate threshold value in the processing after the stage change. Further, it is possible to omit the time and labor required for the person in charge to set the threshold value each time the stage is changed.

In the abnormality detection device according to one aspect of the present invention, the measurement corresponding to a predetermined number of shots from when there is at least one of a change in the die of the press machine and a change in a parameter for controlling the operation of the press machine. A threshold value setting unit that sets the second threshold value using a value may be provided.

According to the above configuration, the measured value for the predetermined number of shots is used from at least one of the die change of the press machine and the parameter change for controlling the operation of the press machine (so-called stage change). The second threshold is set. Thereby, the abnormality determination can be performed using an appropriate threshold value in the processing after the stage change. Further, it is possible to omit the time and labor required for the person in charge to set the threshold value each time the stage is changed.

In the abnormality detection device according to one aspect of the present invention, the measurement corresponding to a predetermined number of shots from when there is at least one of a change in the die of the press machine and a change in a parameter for controlling the operation of the press machine. A threshold setting unit that sets the third threshold by using a value may be provided.

According to the above configuration, the measured value for the predetermined number of shots is used from at least one of the die change of the press machine and the parameter change for controlling the operation of the press machine (so-called stage change). And set a third threshold. Thereby, the abnormality determination can be performed using an appropriate threshold value in the processing after the stage change. Further, it is possible to omit the time and labor required for the person in charge to set the threshold value each time the stage is changed.

In order to solve the above problems, a control method for an abnormality detection device according to an aspect of the present invention is a control method for an abnormality detection device that detects an abnormality in a scrap shooter of a press machine, and is supplied to the scrap shooter. It is characterized by including an acquisition step of acquiring a measured value of the flow rate of air and an abnormality determination step of determining an abnormality in the scrap shooter based on the measured value.

The abnormality detection device according to each aspect of the present invention may be realized by a computer. In this case, the abnormality detection device is implemented by operating the computer as each unit (software element) included in the abnormality detection device. The control program of the abnormality detection device realized by the above, and a computer-readable recording medium recording the program are also included in the scope of the present invention.

According to one aspect of the present invention, since it is possible to determine the abnormality of the scrap shooter by using the change amount of the air flow rate, it is possible to detect the abnormality of the scrap shooter with a simple process.

It is a functional block diagram which shows the principal part structure of the press system which concerns on embodiment of this invention. It is a flowchart which shows the flow of the threshold value setting process in a press system. It is a flow chart which shows a flow of processing in a press system. It is a figure which shows the waveform example of the measured value of an air flow rate, (a) shows a normal waveform example, (b) shows an abnormal waveform example. It is a flow chart which shows a flow of threshold value setting processing in other embodiments of the present invention. It is a flow chart which shows a flow of processing in other embodiments of the present invention. It is a flow chart which shows a flow of processing in other embodiments of the present invention.

[Embodiment 1]
(Overview)
The press system 100 according to the present embodiment detects an abnormality due to clogging (so-called clogging of scrap) of the scrap shooter 111 of the pressing unit 11. The metal pieces (scraps) after being die-cut by the press work are discharged through the scrap shooter 111. However, the scrap shooter is as expected due to the direction of the scrap at the time of discharge, vibration during the press work, and the like. It is not always discharged via 111.

First, with reference to FIG. 1, an overall outline of the press system 100 according to the present embodiment will be described. FIG. 1 is a functional block diagram showing a main configuration of the press system 100. As shown in FIG. 1, the press system 100 according to the present embodiment includes a servo press 1, a measuring device (abnormality detecting device) 2, a WEB server 3, and a person-in-charge terminal 4. In the press system 100, press processing is performed by the servo press 1. Then, the measuring device 2 acquires a measured value from the flow rate sensor 12 that measures the flow rate of the air supplied to the scrap shooter 111 provided in the press unit 11, and determines the abnormality of the scrap shooter 111 from the measured value. When it is determined that there is an abnormality, the person in charge 4 is notified to that effect. Also, the measured value is transmitted to the WEB server 3, and the WEB server 3 creates a Web page where the operator can confirm the measured value.

As described above, in the press system 100 according to the present embodiment, the abnormality of the scrap shooter 111 can be detected only by measuring the flow rate of the air supplied to the scrap shooter 111, so that the abnormality can be easily detected. ..

(Details of each device)
(Servo press 1)
Next, details of each device will be described with reference to FIG. As shown in FIG. 1, the servo press (press machine) 1 includes a press unit 11, a scrap shooter 111, a flow rate sensor 12, a press PLC 14, and a check valve 15. The press section 11 includes a ram for performing die cutting, an upper die, and the like. The work after die cutting is carried out by a route (not shown). The scrap generated during die cutting falls on the scrap shooter 111 for discharging scrap. The scrap shooter 111 is driven by air and a piston to vibrate, and the scrap is obliquely dropped on the scrap shooter 111 to be carried out. During the pressing process, the pressing unit 11 continuously operates, and the scrap shooter 111 also continuously discharges scrap so that clogging does not occur. Since the press processing is the same as the conventional one, its detailed description is omitted.

The flow rate sensor 12 measures the flow rate of air that drives the scrap shooter 111. Air is supplied from a factory air supply source through a hose, passes through the check valve 15, and is supplied to the scrap shooter 111 through the flow rate sensor 12. A sensor current (sensor output) is output from the flow rate sensor 12 and input to the measuring device 2. Since the flow rate sensor 12 is installed inside the servo press 1, the operator only has to connect the factory air supply source and the servo press 1 with a hose, and it is not necessary to perform the sensor installation work or setting work. Absent.

The servo press 1 may include a camera (not shown) for monitoring the scrap shooter 111. The camera may take an image of the scrap shooter 111 and periodically send the monitoring image to the WEB server 3.

The press PLC 14 is a control device for causing a mechanical device such as the press unit 11 to perform press working. Mold information and press operation timing are output from the press PLC 14 and input to the measuring device 2. The mold information can be appropriately input by the operator at the timing of mounting the mold or the like. The press PLC 14 can detect overcurrent, overheat, and the like of the servo motor and stop the press working for protecting the press machine. However, since the processing content is the same as that of the conventional technique, the description thereof is omitted. To do.

(Measuring device 2)
The measuring device 2 includes an acquisition unit 211, a threshold value setting unit 212, an abnormality determination unit 213, a stop command output unit 214, and a notification unit 215.

The acquisition unit 211 acquires the sensor output transmitted from the flow rate sensor 12, the mold information transmitted from the press PLC 14, and the data regarding the press operation timing. Then, the acquisition unit 211 transmits the data to the threshold value setting unit 212, and also transmits the data to the abnormality determination unit 213.

The threshold value setting unit 212 sets a threshold value (first threshold value, second threshold value, third threshold value) that serves as a criterion for abnormality determination. Details of the operation of the threshold setting unit 212 will be described later.

The abnormality determination unit 213 determines whether or not there is an abnormality in the scrap shooter 111 based on the data received from the acquisition unit 211 and the threshold value set by the threshold value setting unit 212. Specifically, the abnormality determination unit 213 calculates the amount of change D from the air flow rate indicated by the sensor output acquired by the acquisition unit 211, and the calculated amount of change D falls below the first threshold value at the predetermined time t1 seconds. If there is, it is determined that there is an abnormality.

The change amount D of the air flow rate can be calculated, for example, by taking the difference between the maximum value and the minimum value for t1 seconds. The method of referring to the amount of change D is not limited to this, and the difference between the average value and the maximum value for t1 seconds or the difference between the average value and the minimum value may be taken, or the sum of squares of the two differences may be calculated. It may be the square root. It is only necessary to be able to stably detect that the amount of change D in the air flow rate has decreased according to the characteristics of the sensor, machine, machining process, waveform, etc., and is not limited to the specific parameters and combinations illustrated.

Further, the first threshold may be set according to the method of calculating the change amount D.

By determining whether or not there is an abnormality based on the amount of change D in the air flow rate, not only the abnormality due to the clogging of the scrap shooter 111 but also the abnormality in the air supply, and the air flow rate is always high Also, the abnormality can be detected.

The stop command output unit 214 outputs a stop command to the press PLC 14 when the abnormality determination unit 213 continuously detects an abnormality a predetermined number of times (for example, three times) or more. By outputting a stop command only when an error is detected continuously for a specified number of times or more, a stop command is output when an erroneous detection occurs, a clogging occurs only once or twice, and the clogging is resolved within three times. It can be prevented.

When the abnormality determination unit 213 determines that there is an abnormality, the notification unit 215 transmits an abnormality detection notification mail to the person-in-charge terminal 4. The abnormality detection notification email describes that an abnormality has occurred. The abnormality notification detection email may include a link for accessing a WEB page described later.

(WEB server 3)
The WEB server 3 includes a DB (database) 31 and a WEB page creation unit 32.

The air flow rate data and the abnormality determination result transmitted from the measuring device 2 are stored in the DB 31. The WEB page creation unit 32 creates a Web page that allows the operator to visually check the flow rate data. Further, the WEB page creation unit 32 may include the above-described monitoring image in the created Web page.

When the abnormality is detected, the person-in-charge terminal 4 receives the abnormality detection notification mail from the measuring device 2. The abnormality detection notification mail may include a link to a WEB page for displaying the air flow rate data or the monitoring image. Thereby, the person in charge can check the air flow rate data and the monitoring image by clicking the described link to check the situation.

(Flow of threshold setting process)
Next, the flow of threshold setting processing by the threshold setting unit 212 will be described with reference to FIG. FIG. 2 is a flowchart showing the flow of threshold setting processing. The threshold for abnormality determination by the abnormality determination unit 213 is set every time the stage is changed. The stage change can be said to be a time when at least one of a die change of the press machine and a parameter change for controlling the operation of the press machine is performed.

As shown in FIG. 2, when the worker changes the mold in the press section (S101) and inputs the setting change in the press PLC 14 (S102), the mold setting information is transmitted from the press PLC 14 to the measuring device 2. Further, the measuring device 2 clears the threshold setting (S103). Next, when the operator performs an operation to start the press (S104), the press PLC 14 turns on the save instruction flag in the press PLC 14 (S105). Then, the measurement device 2 starts the threshold value setting, and the acquisition unit 211 acquires the value of the air flow rate measured by the flow rate sensor 12 (S106).

Then, the measuring device 2 determines whether or not the scrap shooter 111 is in operation (S107). If it is not operating (NO in S107), the threshold setting process is stopped. On the other hand, if it is in the operating state (YES in S107), the threshold setting unit 212 causes the maximum value (MAX), the minimum value (MIN), and the average value (AVE) of the air flow rate values acquired by the acquisition unit 211 in a predetermined period. To calculate. Then, the threshold value setting unit 212 determines the first threshold value for judging the abnormality of the variation D of the air flow rate from the maximum value (MAX), the minimum value (MIN), and the average value (AVE) (S108). ).

The amount of change D in the air flow rate can be determined by the difference between the maximum value and the minimum value. Then, the first threshold can be determined according to the determination method. However, in order to make it safer, it is desirable that the first threshold value is determined to be lower than the value determined from the air flow rate measurement value acquired in step S106.

For example, the MAX value is 800 ml/m (milliliter per minute), the MIN value is 200 ml/m, and the AVE value is 300 ml/m as the actual measurement values. When used, the change amount D is the change amount D=MAX(800)-MIN(200)=600. If this is multiplied by a coefficient of 0.5, for example, the first threshold becomes 600×0.5=300. When the square root of the sum of squares is used as the calculation method of the variation D, the variation D ² =(MAX-AVE) ² +(MIN-AVE) ² =260000, and the square root is obtained to obtain a value of about 510. To be If this is multiplied by a coefficient of 0.5 as in the case described above, the first threshold value becomes 255.

Then, the threshold setting unit 212 sets the determined threshold as the first threshold (S109). With the above, the threshold setting is completed, and the threshold setting unit 212 ends the operation.

Although the above-mentioned setting process is described as being performed based on the value obtained during one shot, it may be based on the value measured for a predetermined number of two or more shots. The required number of times may be appropriately determined in consideration of the inspection result of whether or not a non-defective product is obtained after the stage change, the inspection time, the work time required for automatic setting, the accuracy required for the automatic setting threshold, and the like.

(Flow of processing in the press system 100)
Next, the flow of processing in the press system 100 will be described with reference to FIG. FIG. 3 is a flowchart showing the flow of processing in the press system 100.

When the press is executed in the press unit 11 (S201), the press PLC 14 outputs a press timing signal (S202). The acquisition unit 211 of the measurement device 2 receives the press timing signal and the sensor output indicating the measured value of the air flow rate (acquisition step), and outputs the sensor output to the abnormality determination unit 213.

The abnormality determination unit 213 determines whether or not the amount of change D in the air flow rate at the predetermined time t1 seconds is below the first threshold value (S203, abnormality determination step). When the change amount D of the air flow rate is equal to or larger than the first threshold value (NO in S203), the pressing process is continued as it is. On the other hand, when the change amount D of the air flow rate is below the first threshold value (YES in S203), the abnormality determination unit 213 determines that there is an abnormality, and sends an abnormality detection notification mail to the person in charge 4 through the notification unit 215. It transmits (S204), and the person in charge terminal 4 receives the abnormality detection notification mail (S205). After that, the abnormality determination unit 213 determines, for each predetermined time t1 seconds, whether or not the change amount D of the air flow rate at the time t1 seconds is below the first threshold value, and continuously falls below the first threshold value three times. If it is determined (YES in S206), a facility stop command is output to the press PLC 14 (S207).

The predetermined time t1 may be a period in which the change amount D can be stably calculated, and is, for example, 1 second. Further, for example, the predetermined time t1 seconds may be automatically set based on the time required for one shot.

Further, in step S206, it is determined whether or not the value is below the first threshold value three times in succession, but three times is merely an example and may be four times or more. In order to further improve the power consumption, the equipment stop command may be output once.

Upon receiving the equipment stop command, the press PLC 14 outputs a cycle stop command to the press unit 11 (S208), and the press unit 11 stops the press operation upon receiving the stop command (S209).

Note that the measuring device 2 transmits to the WEB server 3, such as which servo press 1 occurred when the abnormality detection notification mail was sent and the facility stop command was output, and the WEB page creation unit 32 of the WEB server 3 concerned. You may create the Web page which can confirm a situation. As a result, the person in charge can confirm and analyze the servo press 1 and the time at which an abnormality is likely to occur.

(Example of waveform)
Next, an example of a waveform created by the WEB page creation unit 32 will be described with reference to FIG. FIG. 4 is a diagram showing an example of a waveform, (a) shows a waveform at a normal time, and (b) shows a waveform at an abnormal time.

As shown in FIG. 4A, the flow rate of air in the normal state increases at the timing of discharging the scrap and decreases after the discharging. And repeat this. On the other hand, as shown in FIG. 4B, the waveform becomes different from that of FIG. In the example shown in FIG. 4B, the state where the flow rate is small continues, and the air does not flow properly. In this case, the scrap shooter 111 is clogged.

[Embodiment 2]
Another embodiment of the present invention will be described below. For convenience of description, members having the same functions as the members described in the above embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

In the present embodiment, in addition to the abnormality determination described in the first embodiment, the abnormality determination based on the average value of the air flow rate and the operation cycle of the scrap shooter 111 is performed.

Specifically, the abnormality determination unit 213 performs the abnormality determination based on whether or not the average value of the air flow rate during the predetermined time t2 minutes is below the second threshold value. In addition, the abnormality determination unit 213 determines that the operation frequency of the scrap shooter 111 (CPM (cycle per minutes), the number of cycles per minute when one operation of the scrap shooter 111 is one cycle) is below the third threshold value. Whether or not there is an abnormality is determined.

(Flow of threshold setting process)
Next, the flow of the threshold setting process in this embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing the flow of threshold setting processing. Note that steps up to step S307 are the same as those in FIG. 2 in the above-described first embodiment, so description thereof will be omitted.

If the scrap shooter 111 is operating in step S307 (YES in S307), the measuring device 2 measures the CPM of the scrap shooter 111 (S308). The value of CPM can be determined as CPM (cycles/minute)=C×60/t3. Next, the threshold setting unit 212 calculates the maximum value (MAX), the minimum value (MIN), and the average value (AVE) of the air flow rate values acquired by the acquisition unit 211 in a predetermined period. Then, the threshold value setting unit 212 determines the first threshold value for judging the abnormality of the variation D of the air flow rate from the maximum value (MAX), the minimum value (MIN), and the average value (AVE) (S309). ). Further, the threshold value setting unit 212 determines the second threshold value from MAX, MIN, and AVE of the air flow rate (S310). The second threshold may be a value obtained by multiplying the AVE value by a specific coefficient to prevent erroneous detection. Further, the MIN value may be used, an intermediate value between the AVE value and the MIN value, a value divided by a specific ratio, or the like may be used.

For example, when an intermediate value between the AVE value and the MIN value is used, if the AVE value of 300 ml/m and the MIN value of 200 ml/m are obtained, the second threshold value is 300×0.5+200×0. It may be set to 0.5=250.

After determining the second threshold, the threshold setting unit 212 determines the third threshold from the CPM value (S311). In order to prevent erroneous detection, the third threshold value can be determined as a value lower than the actually measured CPM value by, for example, multiplying the obtained actually measured CPM value by a specific coefficient. For example, if the obtained measured CPM value is 1200 (cycles/minute), 0.8 may be multiplied as a specific coefficient, and 1200×0.8=960 may be set as the third threshold value.

Then, the threshold setting unit 212 sets the determined thresholds as the first threshold, the second threshold, and the third threshold, respectively (S312). With the above, the threshold setting is completed, and the threshold setting unit 212 ends the operation.

(Flow of processing in the press system 100)
Next, the flow of processing in the press system 100 will be described with reference to FIGS. 6 and 7. 6 and 7 are flowcharts showing the flow of processing in the press system 100. Note that the description of the steps for performing the same processing as that of FIG.

In the present embodiment, the processes of steps S403 and S404 are performed instead of the process of step 203 in FIG. First, the abnormality determination processing in step S403 will be described with reference to FIG.

In the abnormality determination processing, first, the abnormality determination unit 213 determines whether or not the change amount D of the air flow rate at the predetermined time t1 seconds is below the first threshold value (S4111). If it is below (YES in S4111), the abnormality determination unit 213 turns on the abnormality detection flag (S4114) and ends the processing.

On the other hand, if not lower (NO in S4111), the abnormality determination unit 213 determines whether or not the average value of the air flow rate during the predetermined time t2 minutes is lower than the second threshold value (S4112). The predetermined time t2 minutes may be a period in which the change amount D can be stably calculated, like the predetermined time t1 seconds, and is, for example, one minute. Further, for example, the predetermined time t2 minutes may be automatically set based on the time required for one shot.

If it is determined that it is below the threshold, the abnormality determination unit 213 turns on the abnormality detection flag (S4114), and ends the processing.

If it is determined in step S4112 that the second threshold value is not exceeded (NO in S4112), the abnormality determination unit 213 determines that the number of cycles determined from the waveform of the air flow rate is the third threshold value for the predetermined time t3 seconds. It is determined whether or not it is less than (S4113). The predetermined time t3 seconds may be set in the same manner as the predetermined time t1 seconds and is, for example, 30 seconds.

When it is determined in step S4113 that the CPM is below the third threshold value (YES in S4113), the abnormality determination unit 213 turns on the abnormality detection flag (S4114). On the other hand, if it does not fall below the third threshold value (in S4113), the abnormality determination unit 213 turns off the abnormality detection flag (S4115) and ends the processing.

This is the end of the abnormality determination processing in step 403.

When the abnormality determination process in step S403 ends, the abnormality determination unit 213 determines whether the abnormality detection flag is ON (S404). If the abnormality detection flag is not ON (NO in S404), the pressing process continues.

On the other hand, when it is determined that the abnormality detection flag is ON (YES in S404), the abnormality detection notification mail is transmitted to the person-in-charge terminal 4 (S405, the same as S204 in FIG. 3). The subsequent processing is the same as that of FIG. 3 of the first embodiment.

Note that in step S206 of FIG. 3, it is determined whether or not the first threshold value has been dropped three times in succession. However, in step S407 of the present embodiment, whether the abnormality detection flag is ON three times in succession. It is determined whether or not.

In this embodiment, the abnormality determination is performed based on the average value of the air flow rate in the predetermined time t2 minutes. Thereby, when the air flow rate is gradually changed, the abnormality determination can be appropriately performed.

Further, in the present embodiment, the abnormality is determined based on the CPM obtained from the number of cycles for the predetermined time t3 seconds. This makes it possible to determine that an abnormality has occurred even if an abnormality appears as a decrease in the cycle frequency of the scrap shooter 111.

Further, in the present embodiment, in order to detect the abnormality (clogging) of the operation of the scrap shooter 111, the threshold is set as the lower limit value to detect the abnormality, but in order to detect the abnormality of operation not limited to the clogging, An abnormality may be detected by providing a threshold value that is an upper limit value.

[Example of software implementation]
The control block (particularly, the threshold setting unit 212, the abnormality determination unit 213, and the stop command output unit 214) of the measuring device 2 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like. However, it may be realized by software.

In the latter case, the measuring device 2 includes a computer that executes the instructions of a program that is software that realizes each function. The computer includes, for example, at least one processor (control device) and at least one computer-readable recording medium that stores the program. Then, in the computer, the processor reads the program from the recording medium and executes the program to achieve the object of the present invention. As the processor, for example, a CPU (Central Processing Unit) can be used. As the recording medium, a "non-transitory tangible medium" such as a ROM (Read Only Memory), a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, a RAM (Random Access Memory) for expanding the program may be further provided. The program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. Note that one aspect of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

The present invention is not limited to the above-described embodiments, but various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments Is also included in the technical scope of the present invention.

1 Servo press (press machine)
2 Measuring device (abnormality detection device)
3 WEB server 4 person in charge terminal 11 press section 111 scrap shooter 12 flow rate sensor 14 press PLC
211 Acquisition Unit 212 Threshold Setting Unit 213 Abnormality Determination Unit 214 Stop Instruction Output Unit 215 Notification Unit

Claims (11)

An abnormality detection device for detecting an abnormality in a scrap shooter of a press machine,
An acquisition unit that acquires a measurement value of the flow rate of the air supplied to the scrap shooter,
An abnormality determination unit that determines an abnormality of the scrap shooter based on the measured value ,
An abnormality detection device, wherein the abnormality determination unit determines that the scrap shooter has an abnormality when an average value of the measured values in a second predetermined period is smaller than a second threshold value . The second threshold value is set using the measured value corresponding to a predetermined number of shots since at least one of changing the die of the press machine and changing the parameter for controlling the operation of the press machine. The abnormality detection device according to claim 1 , further comprising a threshold value setting unit. An abnormality detection device for detecting an abnormality in a scrap shooter of a press machine,
An acquisition unit that acquires a measurement value of the flow rate of the air supplied to the scrap shooter,
An abnormality determination unit that determines an abnormality of the scrap shooter based on the measured value ,
The abnormality determination unit determines the number of cycles per minute from the waveform of the measured value, and when the determined number of cycles in the third predetermined period is smaller than the third threshold value, the scrap shooter has an abnormality. An abnormality detection device characterized by making a determination . The third threshold value is set using the measured value corresponding to a predetermined number of shots from at least one of changing the die of the pressing machine and changing the parameter for controlling the operation of the pressing machine. The abnormality detection device according to claim 3 , further comprising a threshold value setting unit. The abnormality determination unit determines that the scrap shooter has an abnormality when the amount of change in the measured value in the first predetermined period is smaller than a first threshold value . The abnormality detection device according to any one of items . An abnormality detection device for detecting an abnormality in a scrap shooter of a press machine,
An acquisition unit that acquires a measurement value of the flow rate of the air supplied to the scrap shooter,
An abnormality determination unit that determines an abnormality of the scrap shooter based on the measured value,
The abnormality determination unit determines that the scrap shooter has an abnormality when the amount of change in the measured value in the first predetermined period is smaller than a first threshold value,
The first threshold value is set using the measured value corresponding to a predetermined number of shots from at least one of changing the die of the press machine and changing the parameter for controlling the operation of the press machine. An abnormality detecting device comprising a threshold setting unit . A method for controlling an abnormality detection device for detecting an abnormality in a scrap shooter of a press machine, comprising:
An acquisition step of acquiring a measurement value of the flow rate of the air supplied to the scrap shooter,
An abnormality determining step of determining an abnormality in the scrap chute on the basis of the measurement value, only contains,
In the abnormality determination step, when the average value of the measured values in the second predetermined period is smaller than a second threshold value, it is determined that the scrap shooter has an abnormality . A method for controlling an abnormality detection device for detecting an abnormality in a scrap shooter of a press machine, comprising:
An acquisition step of acquiring a measurement value of the flow rate of the air supplied to the scrap shooter,
An abnormality determining step of determining an abnormality in the scrap chute on the basis of the measurement value, only contains,
In the abnormality determination step, the number of cycles per minute is determined from the waveform of the measured value, and when the determined number of cycles in the third predetermined period is smaller than the third threshold value, the scrap shooter has an abnormality. A method of controlling an abnormality detection device, characterized by making a determination . A method for controlling an abnormality detection device for detecting an abnormality in a scrap shooter of a press machine, comprising:
An acquisition step of acquiring a measurement value of the flow rate of the air supplied to the scrap shooter,
An abnormality determining step of determining an abnormality in the scrap chute on the basis of the measurement value, only contains,
In the abnormality determination step, when the amount of change in the measured value in the first predetermined period is smaller than the first threshold value, it is determined that the scrap shooter has an abnormality,
The first threshold value is set using the measured value corresponding to a predetermined number of shots from at least one of changing the die of the press machine and changing the parameter for controlling the operation of the press machine. A method of controlling an abnormality detection device, further comprising a threshold setting step . A control program for causing a computer to function as the abnormality detection device according to claim 1 , 3, or 6 , wherein the computer functions as the abnormality determination unit. A computer-readable recording medium in which the control program according to claim 10 is recorded.

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