JP2019013947A - Metal mold pressing device and metal mold pressing method - Google Patents

Abstract

To provide a metal mold pressing device and a metal mold pressing method capable of accurately monitoring a load during processing and detecting an abnormality of processing more accurately.SOLUTION: A metal mold pressing device comprises a sensor 51 for detecting a load applied to a work W during processing thereof, and a load collection controller 52 for collecting a load value Lt detected by the sensor 51 at prescribed sampling intervals in a single round of processing, storing a collected load value Ltn and a time tn at which the load value Ltn was collected in a storage unit 52a in association with each other, and executing detection processing for an abnormality during processing based on the load value Lt detected by the sensor 51 and the load value Ltn stored in the storage unit 52a. The load collection controller 52 starts detection processing for an abnormality after the load value Lt detected by the sensor 51 has become equal to a prescribed threshold value Ls or greater after starting collection of the load value Lt.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a mold press apparatus and a mold press method, and more particularly to a mold press apparatus and a mold press method for monitoring a load during a processing operation.

  2. Description of the Related Art Conventionally, there is a mold press device (hereinafter referred to as a press device) that detects an abnormality by monitoring a load during processing. When trying to detect abnormalities during machining based on the load detected during machining, for example, whether the load peak value (hereinafter also referred to as peak load) is within the set upper and lower limits There is a method of detecting an abnormality depending on whether or not. Further, for example, there is a method of detecting an abnormality by comparing the peak load of the machining performed immediately before with the peak load of the machining currently performed and determining whether the peak load is within an allowable range. Thus, what uses the peak value of load for the detection of abnormality is proposed (for example, refer to patent documents 1).

  Furthermore, when trying to monitor the difference in load value, there is the following method. In one process, load values are collected at predetermined time intervals, and a load value waveform (hereinafter also referred to as a load waveform) from the start to the end of load value collection is obtained. A load waveform at the time of machining performed in the past is collected a plurality of times, and an average waveform of the plurality of load waveforms (hereinafter referred to as an average waveform) is used as a comparison target. The waveform to be compared is called a master waveform. The master waveform and the load value collected during the current machining are continuously compared in real time, and based on the comparison result, it is determined whether or not the current load value is within the set allowable range at any time. Thus, there is also a method for detecting a load abnormality. Such a method is also called tracking error monitoring.

  The timing to start collecting load values at the time of processing is based on the crank angle of the press device, etc., starting at an electrical or mechanical timing, and comparing with past load waveforms as load values are collected. Is started with respect to the time axis.

Japanese Patent Laid-Open No. 08-300058

  However, in tracking error monitoring, in which the load waveform at the time of past machining is compared as needed to monitor the machining, monitoring of the tracking error is started at the same time as the load value collection start timing. For this reason, if the timing for starting the collection of load waveforms deviates, the load value will be out of the allowable range even though normal machining is being performed, and it is determined that the load value is abnormal. May be judged as.

  The present invention has been made in view of the above circumstances, and provides a mold press apparatus and a mold press method capable of accurately monitoring a load during processing and performing more accurate processing abnormality detection. This is an exemplary problem.

  In order to solve the above problems, the present invention has the following gist.

[Purpose 1]
A die press device for processing a workpiece,
Load detecting means for detecting a load applied during machining of the workpiece;
Collecting means for collecting the load value detected by the load detecting means at a predetermined time interval during one machining, and storing the collected load value and the time of collecting the load value in a storage unit;
An anomaly detecting means for performing processing abnormality detection processing based on the load value detected by the load detecting means and the load value stored in the storage unit;
With
The abnormality detection unit starts the abnormality detection process after the collection unit starts collecting the load value and the load value detected by the load detection unit exceeds a predetermined threshold value. .

[Purpose 2]
The abnormality detecting means obtains an average value of a plurality of load values associated with substantially the same time collected by the collecting means and stored in the storage unit in a plurality of processes, and the load detected by the load detecting means When the value is within a predetermined range including the average value associated with the time substantially the same as the time when the load value was detected, the load value is determined to be normal, and the load detection means When the detected load value is not within the predetermined range, the load value may be determined to be abnormal.

[Purpose 3]
Driving means;
A slide for moving the mold for processing the workpiece up and down;
A connecting rod for moving the slide up and down;
A crankshaft that is rotated by the drive means and transmits the power of the drive means to the slide via the connecting rod;
Angle detection means for detecting the angle of the crankshaft;
With
The collecting means may start collecting the load value when the angle of the crankshaft detected by the angle detecting means becomes a predetermined angle.

[Purpose 4]
Comprising a control means for controlling the mold press device,
When the number of times that the load value is determined to be abnormal exceeds a predetermined number of times, the abnormality detection unit determines that an abnormality has occurred in processing, and notifies the control unit that an abnormality has occurred in the processing,
The control means may stop the die press device when notified from the abnormality detection means that an abnormality has occurred in the machining.

[Purpose 5]
A mold press method using a mold press apparatus for processing a workpiece,
A load detection step of detecting a load applied during machining of the workpiece by a load detection means;
A collecting step of collecting the load value detected by the load detecting means by the collecting means at a predetermined time interval during one machining, and storing the collected load value and the time of collecting the load value in the storage unit in association with each other When,
An abnormality detection step of performing processing abnormality detection processing by the abnormality detection means based on the load value detected by the load detection means and the load value stored in the storage unit;
With
In the abnormality detection step, the abnormality detection unit is configured to detect the abnormality after the collection unit starts collecting the load value and the load value detected by the load detection unit exceeds a predetermined threshold value. The detection process is started.

  Further objects and other features of the present invention will become apparent from the preferred embodiments described below with reference to the accompanying drawings.

  According to the present invention, it is possible to provide a die press apparatus and a die press method capable of accurately monitoring a load during processing and performing more accurate processing abnormality detection.

The figure which shows the structure of the press apparatus of embodiment. Block diagram of press apparatus of embodiment (A) graph showing load monitoring at normal time, (b) graph showing load monitoring at abnormal time, (c) graph when it is determined that load value is abnormal due to timing shift The flowchart which shows the process which detects abnormality of the load value of embodiment Graph showing load monitoring of embodiment

[Embodiment]
(Description of press equipment)
FIG. 1 is a schematic view of the press apparatus S. The press device S includes a drive motor 4, a transmission mechanism 6, a crankshaft 8, a connecting rod 10, and a slide 12 inside and outside the housing 2. The press device S includes a device-side controller 14 (control means), a display unit 16, and an input unit 18.

  The drive motor 4 is a servomotor that is servo-controlled, for example, and moves the die 3 (described later) up and down via the transmission mechanism 6, the crankshaft 8, and the connecting rod 10 while controlling the amount and direction of rotation. The transmission mechanism 6 includes a transmission member such as a gear or a belt, and transmits the rotation of the motor shaft of the drive motor 4 to the crankshaft 8. A control signal to the drive motor 4 is sent from the apparatus-side controller 14.

  The crankshaft 8 and the connecting rod 10 are for converting the rotational movement of the motor shaft transmitted by the transmission mechanism 6 into reciprocating movement (in this embodiment, vertical movement). The crankshaft 8 is rotated by the rotation of the motor shaft, and the rotation is transmitted to the connecting rod 10 whose one end is connected to the crankshaft 8 so that the connecting rod 10 moves up and down (moves up and down).

  A slide 12 is connected to the vicinity of the other end of the connecting rod 10. As the connecting rod 10 moves up and down, the slide 12 moves up and down along a guide (not shown). As shown schematically in FIG. 1, the slide 12 faces the bolster 22. In the press device S, a bolster 22 is disposed so as to face the slide 12. An upper mold 3 a as a part of the mold 3 is mounted on the surface (the lower surface in the present embodiment) of the slide 12 facing the bolster 22. A lower mold 3 b as a part of the mold 3 is mounted on the surface of the bolster 22 facing the slide 12 (upper surface in the present embodiment).

  The workpiece W as a processing target is disposed between the upper die 3a and the lower die 3b, and the upper die 3a and the lower die 3b are pressed. Specifically, the drive motor 4 rotates under the control of the apparatus-side controller 14. The rotation of the drive motor 4 is transmitted to the connecting rod 10 via the transmission mechanism 6 and the crankshaft 8, and the slide 12 moves up and down. The upper mold 3a and the lower mold 3b are pressed by the downward movement of the slide 12, and the workpiece W is pressed. That is, in the press device S, the drive motor 4, the transmission mechanism 6, the crankshaft 8, the connecting rod 10, and the slide 12 constitute a press portion. The transmission mechanism 6 is provided with a rotary encoder 25 for detecting the rotational speed of the crankshaft 8.

  The sensor 51 which is a load detection means is for detecting mechanical characteristics (load in this embodiment) generated between the mold 3 and the workpiece W when the press device S performs press processing on the workpiece W. is there. For example, the sensor 51 may be a strain gauge installed in the housing 2. The sensor 51 may be installed at any position (for example, near the center) of the connecting rod 10.

(Block diagram of press machine)
FIG. 2 is a block diagram showing the configuration of the press device S and the periphery of the press device S. The press device S includes the device-side controller 14 and the rotary encoder 25 described above. The press device S also includes a display setting unit 53 including a display unit 16 and an input unit 18. In the present embodiment, the press apparatus S includes the display setting unit 53, but a display setting unit may be provided separately from the press apparatus S.

  The load meter LS is attached to the press device S, and includes the sensor 51 and the load collecting controller 52 described with reference to FIG. The load collecting controller 52 includes a storage unit 52a. The load collecting controller 52 converts the value detected by the sensor 51 into a load value and, for example, the load value Lt1 at time t1, the load value Lt2 at time t2, with reference to the timing at which the collection is started,. The time and the load value are associated with each other and stored in the storage unit 52a like the load value Ltn at the time tn. That is, the load collecting controller 52 collects the load value Ltn detected by the sensor 51 at a predetermined time interval during one machining, and corresponds the collected load value Ltn to the time tn when the load value Ltn is collected. In addition, it functions as a collecting means for storing in the storage unit 52a. The storage unit 52a only needs to store the time when the load value is collected and the load value so as to correspond to each other, and is not limited to the method described above.

  The load collecting controller 52 collects load values at predetermined time intervals (hereinafter referred to as sampling intervals). The load collecting controller 52 shows characteristics of load values from the start to the end of load value collection from a plurality of load values collected during one machining (during one machining). A waveform as shown in FIG. 3 is obtained. Hereinafter, the waveform as shown in FIG. 3 is referred to as a load waveform. For example, the load collection controller 52 collects the load waveforms for the number of collections set in advance by the display setting unit 53, stores the load waveforms for the number of collections in the storage unit 52a, and performs an abnormality detection described later. At this time, load waveforms corresponding to the number of collections are read from the storage unit 52a, and an average load waveform (hereinafter also referred to as an average waveform) is obtained. Further, the load collecting controller 52 may obtain an average waveform of the load waveforms for the number of collections in advance, and store the obtained average waveform in the storage unit 52a. The obtained average waveform is a master waveform used for comparison with the load value collected at the next machining.

  In the present embodiment, the load collecting controller 52 obtains an average value of a plurality of load values Ltn associated with substantially the same time tn collected in a plurality of processes and stored in the storage unit 52a. When the load value Ltn detected by the sensor 51 at tn is within a predetermined range including the average value, the load value Ltn is determined to be normal, and the load value detected by the sensor 51 at substantially the same time tn. When Ltn is not within the predetermined range, the load value Ltn is determined to be abnormal. The load collecting controller 52 functions as an abnormality detection means for performing an abnormality detection process during processing.

  The load collecting controller 52 collects load values during machining, compares the collected load values with the master waveform, and compares the current load value with the load value of the master waveform corresponding to the time of the current load value. When the difference exceeds a preset allowable value, a variable for counting that the allowable value is exceeded is incremented, or the device-side controller 14 is notified that the current load value has exceeded the allowable value. . In the present embodiment, description will be made assuming that notification to the device-side controller 14 is not performed only when the load value exceeds the allowable value once, but notification is made to the device-side controller 14 when the predetermined number of times is exceeded.

  When the operation of the press device S is started and the device-side controller 14 determines that the angle of the crankshaft 8 has reached a preset angle to start collecting load waveforms based on the detection result of the rotary encoder 25, A signal for instructing to start the collection of the load waveform (hereinafter referred to as a load waveform collection start signal) is output to the load collecting controller 52. Further, when the device-side controller 14 determines that the processing of the press device S has been completed and the angle of the crankshaft 8 has reached a predetermined load waveform collection based on the detection result of the rotary encoder 25. Then, a signal for instructing to end the collection of the load waveform (hereinafter referred to as a load waveform collection end signal) is output to the load collecting controller 52. The device-side controller 14 functions as an angle detection unit that detects the angle of the crankshaft 8.

  The display setter 53 is for inputting a set value necessary for detecting a load abnormality. The display setting unit 53 receives a sampling interval, the number of load waveform collections, a load waveform variation tolerance, a waveform comparison start load, and the like. Here, the number of collection of load waveforms is the number of collections for obtaining an average waveform of load waveforms. For example, if a load waveform that has been processed only once in the past is a master waveform, and the load waveform contains noise, even if a normal load waveform that does not contain noise is obtained in the next machining, Since it deviates from the waveform, it is detected as an abnormality. For this reason, when obtaining a master waveform, an average of a plurality of load waveforms collected in a plurality of past processes is taken to reduce erroneous detection due to noise.

  Also, the load waveform variation allowable value is a deviation amount allowed from the average waveform for the current load value. When this deviation amount is added to the load value at a predetermined time of the average waveform, the upper limit allowable value L1 is obtained, and when this deviation amount is subtracted from the load value, the lower limit allowable value L2 is obtained. In the present embodiment, it is determined whether or not the current load value is deviated from the average waveform using the upper limit allowable value L1 and the lower limit allowable value L2. That is, the load collecting controller 52 performs an abnormality detection process depending on whether or not the current load value is within a predetermined range including the average waveform. Furthermore, the waveform comparison start load is a predetermined threshold value Ls of a load value that serves as a trigger for starting the comparison between the average waveform and the current load value, in other words, the abnormality detection process.

(Conventional load monitoring)
FIG. 3 is a graph illustrating a conventional load monitoring method for comparison with the present embodiment. In the graph of FIG. 3, the horizontal axis indicates time [milliseconds (msec)], and the vertical axis indicates load [kilonewtons (kN)]. Within a predetermined time from the start of processing to the end of processing, the load collecting controller 52 converts the value detected by the sensor 51 into a load value Lt and collects the load value Lt at a predetermined sampling interval. Is going on. The load collecting controller 52 collects the load value Lt in a plurality of processes and obtains an average waveform.

  FIG. 3A is a graph showing a conventional load waveform. An average waveform indicated by a solid line is obtained in a plurality of processes. The average waveform is a master waveform used for comparison. Two graphs indicated by broken lines show the allowable setting value, the upper part indicates the upper limit allowable value L1, and the lower part indicates the lower limit allowable value L2. That is, if the collected load value Lt is between the upper limit allowable value L1 and the lower limit allowable value L2, the load value Lt is determined to be normal.

  FIG. 3B is a graph showing a conventional load waveform, and shows the load waveform when an abnormality in the load value is detected. A solid line indicates a load waveform (collected load waveform) collected in the current machining. In FIG. 3B, the current load value Lt is greatly deviated from the master waveform (the bold line portion in the figure), and the load collecting controller 52 has a difference between the load value Lt and the master waveform exceeding the allowable value. Increment the variable that counts. When the number of times that the difference between the load value Lt and the master waveform exceeds the allowable value exceeds a predetermined number, the load collecting controller 52 notifies the apparatus controller 14 of the processing abnormality. The apparatus-side controller 14 stops the press apparatus S when notified of the processing abnormality from the load collecting controller 52.

  Here, in the conventional load monitoring, the load waveform collection start timing and the load waveform monitoring start timing are substantially the same (see FIG. 3A). Here, the load waveform is monitored by monitoring whether the collected load value Lt is between the upper limit allowable value L1 and the lower limit allowable value L2, that is, whether the load value Lt is normal. Yes, an abnormality detection process for the load value Lt is performed.

  As described above, when the load waveform collection start signal is input from the apparatus-side controller 14, the load collection controller 52 starts collecting the load value Lt. Based on the detection result of the rotary encoder 25, the apparatus-side controller 14 outputs a load waveform collection start signal when the angle of the crankshaft 8 becomes a predetermined angle. As described above, the timing of starting the collection of the load waveform is determined based on the angle detection on the press device S side, and thus may vary. For example, when the angle detection accuracy based on the detection result of the rotary encoder 25 is about 1 degree, a deviation of 1 degree may be shifted by 3 milliseconds in time. In the processing of the press apparatus S, the time difference of 3 milliseconds is large, and there is a possibility that the load waveform collection start timing may be greatly shifted.

  FIG. 3C is a graph showing a conventional load waveform, which is a graph showing a case where the load waveform collection start timing is shifted by Δt milliseconds although there is no abnormality in the load value Lt. In FIG.3 (c), a master waveform is shown with a dashed-dotted line, and the load waveform collected in the present process is shown with a continuous line. There is no abnormality in the collected load value Lt itself, but the load monitoring timing has deviated, so that it deviates from the master waveform, and the load collecting controller 52 causes the load value Lt to exceed the predetermined number of times. Since the allowable value has been exceeded, a processing abnormality is notified to the apparatus-side controller 14 (arrow α portion). The apparatus-side controller 14 stops the operation of the press apparatus S because the processing abnormality is notified. In the present embodiment, in order to solve this problem, the rising of the load value Lt is used as the timing for starting comparison, and monitoring is started therefrom, so that even when the timing for starting the collection of load waveforms deviates, the accuracy is improved. Monitor by load waveform.

(Monitoring of load of this embodiment)
FIG. 4 is a flowchart for explaining a load monitoring process in the present embodiment. When processing is started in the press apparatus S, processing after step (hereinafter referred to as S) 401 is started. Note that Ls is a load value serving as a trigger for starting comparison between the load value and the master waveform, and Lt is a load value collected during the current machining. L1 is an upper limit load value, which corresponds to a graph indicated by the upper broken line in FIG. 3A, and L2 is a lower limit load value, which is indicated by the lower broken line in FIG. 3A. Corresponds to a graph. Further, Nerr is a variable for storing the number of times that the load collecting controller 52 has determined that the load value Lt is abnormal. Nth is a threshold value for determining whether or not to stop the press apparatus S. When the flowchart of FIG. 4 is started, it is assumed that the average waveform obtained in the past and the upper limit allowable value L1 and the lower limit allowable value L2 obtained from the average waveform are stored in the storage unit 52a. .

  In S <b> 401, the load collection controller 52 determines whether a load waveform collection start signal is received from the apparatus-side controller 14. If the load collection controller 52 determines in S401 that the collection start signal has not been received, the process returns to S401. If it is determined that the collection start signal has been received, the process proceeds to S402. The load collecting controller 52 starts collecting the load value Lt. In S402, the load collecting controller 52 determines whether or not the current load value Lt is equal to or greater than a threshold value Ls for starting monitoring. When the load collecting controller 52 determines in S402 that the load value Lt is less than the threshold value Ls, the process returns to S402. Thus, in the present embodiment, when the collected load value Lt is less than the threshold value Ls, the load value Lt is not compared with the master waveform, and the abnormality determination of the load value Lt is not performed.

  If the load collection controller 52 determines in S402 that the load value Lt is greater than or equal to the threshold value Ls, the process proceeds to S403. In S403, the load collecting controller 52 monitors the load waveform, that is, compares the current load value Lt with the master waveform, and starts detecting an abnormality of the load value Lt based on the comparison result. Also, the abnormality detection count Nerr is initialized to zero. In S404, the load collecting controller 52 determines whether or not the current load value Lt is less than or equal to the upper limit allowable value L1, and if it is determined that the current load value Lt is less than or equal to the upper limit allowable value L1, the processing is performed. If the process proceeds to S405 and it is determined that the load value Lt is larger than the upper limit allowable value L1, the process proceeds to S409. The upper limit allowable value L1 and the lower limit allowable value L2 based on the master waveform used here are values corresponding to the time when the current load value Lt is detected.

  In S405, the load collecting controller 52 determines whether or not the load value Lt is equal to or greater than the lower limit allowable value L2, and if it is determined that the load value Lt is equal to or greater than the lower limit allowable value L2, the process proceeds to S406. If it is determined that the load value Lt is smaller than the lower limit allowable value L2, the process proceeds to S409. When the current load value Lt is not less than the lower limit allowable value L2 and not more than the upper limit allowable value L1, the load collecting controller 52 determines that the load value Lt is normal.

  In S406, the load collecting controller 52 determines whether or not a load waveform collection end signal has been received from the apparatus-side controller 14. If it is determined that the collection end signal has not been received, the process proceeds to S407. If it is determined that a collection end signal has been received, the process proceeds to S408. In step S407, the load collecting controller 52 reads the upper limit allowable value L1 and the lower limit allowable value L2 of the next time in the master waveform from the storage unit 52a in order to perform comparison with the load value Lt to be collected next. To S404.

  In S408, the load collecting controller 52 completes the collection of the load value Lt in one process. Further, the load collecting controller 52 ends the load value abnormality detection (monitoring of the load waveform) by comparing the load value Lt and the master waveform in one process. The load collecting controller 52 uses the load value Lt collected in the currently completed machining for comparison with the load value Lt detected in the next machining, so that the upper limit allowable value L1 used in monitoring the next load waveform is used. The lower limit allowable value L2 is recalculated. In other words, a new master waveform is obtained in consideration of the load waveform collected in the currently completed machining.

  In S409, the load collecting controller 52 adds 1 to the abnormality detection count Nerr because the load value Lt is not within the range between the lower limit allowable value L2 and the upper limit allowable value L1 and is an abnormal value. (Nerr = Nerr + 1). In S410, the load collecting controller 52 determines whether or not the abnormality detection number Nerr is greater than a preset threshold value Nth. If it is determined that the abnormality detection number Nerr is less than or equal to the threshold value Nth, the process proceeds to S406. . In this case, since the number of detections is the same or less than the threshold value Nth, which is an allowable value of the number of times that an abnormality has been detected, the collection of the load value Lt is continued.

  If the load collecting controller 52 determines in S410 that the abnormality detection count Nerr is greater than the threshold value Nth, the process proceeds to S411. In this case, since the number of times of abnormality detection is larger than the threshold value Nth, which is an allowable value of the number of times of abnormality detection, the load collecting controller 52 determines in S411 that an abnormality has occurred in the processing, and is a processing abnormality. Is notified to the device-side controller 14. The apparatus-side controller 14 stops the press apparatus S and ends the process because an abnormality has occurred in the processing.

  FIG. 5 is a graph when the load value Lt monitoring process of the present embodiment is performed, in which the horizontal axis represents time (msec) and the vertical axis represents the load (kN). In FIG. 5, the solid line indicates a load waveform obtained from the collected load value Lt, and the broken line indicates a master waveform. Conventionally, as shown in FIG. 3A, the load waveform collection start timing and the load waveform monitoring start timing are the same timing. On the other hand, as shown in FIG. 5, in the present embodiment, even after the collection of the load waveform is started, the load waveform is monitored (the load value Lt and the master waveform until the collected load value Lt becomes equal to or greater than the threshold value Ls. Comparison) is not started. Thus, in the present embodiment, the load value Lt is equal to or greater than the set load value Ls, instead of matching the start of comparison between the load value Lt and the master waveform with the start of load waveform collection. The load waveform comparison starts at the same timing. As a result, even when the load collection start timing fluctuates due to a delay of the apparatus-side controller 14 or a fluctuation in the rotation speed of the press apparatus S, it is possible to accurately compare the load value Lt with the master waveform.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these, A various deformation | transformation and change are possible within the range of the summary. For example, when the detection accuracy of the load value Lt by the sensor 51 is high, the load value Lt is not between the lower limit allowable value L2 and the upper limit allowable value L1 in the determination of S404 or S405 of FIG. The press device S may be stopped in S411 without performing the determinations in S409 and S410. In the present embodiment, the load collecting controller 52 notifies the apparatus-side controller 14 of the processing abnormality. However, the apparatus-side controller 14 may exhibit all or part of the functions of the load collecting controller 52 described above. Further, when obtaining the master waveform, the collection number set by the display setting unit 53 may not be a past load waveform for the set number of times, and an arbitrarily selected load waveform is used as a comparison target. Also good.

  As described above, according to the present embodiment, it is possible to provide a die press apparatus and a die press method capable of accurately monitoring a load during processing and more accurately detecting an abnormality in processing.

2 Housing 3 Mold 3a Upper mold 3b Lower mold 4 Drive motor 6 Transmission mechanism 8 Crankshaft 10 Connecting rod 12 Slide 14 Apparatus side controller (control means) (angle detection means)
16 Display unit 18 Input unit 22 Bolster 25 Rotary encoder 51 Sensor (Load detection means)
52 Load collecting controller (collecting means) (abnormality detecting means)
52a Storage unit 53 Display setter S Press device (die press device)
W Work

Claims (5)

A die press device for processing a workpiece,
Load detecting means for detecting a load applied during machining of the workpiece;
Collecting means for collecting the load value detected by the load detecting means at a predetermined time interval during one machining, and storing the collected load value and the time of collecting the load value in a storage unit;
An anomaly detecting means for performing processing abnormality detection processing based on the load value detected by the load detecting means and the load value stored in the storage unit;
With
The abnormality detection unit starts the abnormality detection process after the collection unit starts collecting the load value and the load value detected by the load detection unit exceeds a predetermined threshold value. A die press apparatus characterized by that.   The abnormality detecting means obtains an average value of a plurality of load values associated with substantially the same time collected by the collecting means and stored in the storage unit in a plurality of processes, and the load detected by the load detecting means When the value is within a predetermined range including the average value associated with the time substantially the same as the time when the load value was detected, the load value is determined to be normal, and the load detection means The die press apparatus according to claim 1, wherein when the detected load value is not within the predetermined range, the load value is determined to be abnormal. Driving means;
A slide for moving the mold for processing the workpiece up and down;
A connecting rod for moving the slide up and down;
A crankshaft that is rotated by the drive means and transmits the power of the drive means to the slide via the connecting rod;
Angle detection means for detecting the angle of the crankshaft;
With
3. The collection unit according to claim 1, wherein the collection unit starts collecting the load value when the angle of the crankshaft detected by the angle detection unit reaches a predetermined angle. 4. Mold press machine. Comprising a control means for controlling the mold press device,
When the number of times that the load value is determined to be abnormal exceeds a predetermined number of times, the abnormality detection unit determines that an abnormality has occurred in processing, and notifies the control unit that an abnormality has occurred in the processing,
The said control means stops the said metal mold | die press apparatus, if it is notified from the said abnormality detection means that abnormality generate | occur | produced in the said process, The any one of Claims 1-3 characterized by the above-mentioned. The die press apparatus of description. A mold press method using a mold press apparatus for processing a workpiece,
A load detection step of detecting a load applied during machining of the workpiece by a load detection means;
A collecting step of collecting the load value detected by the load detecting means by the collecting means at a predetermined time interval during one machining, and storing the collected load value and the time of collecting the load value in the storage unit in association with each other When,
An abnormality detection step of performing processing abnormality detection processing by the abnormality detection means based on the load value detected by the load detection means and the load value stored in the storage unit;
With
In the abnormality detection step, the abnormality detection unit is configured to detect the abnormality after the collection unit starts collecting the load value and the load value detected by the load detection unit exceeds a predetermined threshold value. A mold press method characterized by starting a detection process.

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