JP4905196B2 - Monitoring system for machine tools - Google Patents

Description

  The present invention relates to a monitoring system for a machine tool including a machine tool and a monitoring device that monitors a machining operation of the machine tool.

Even if an abnormal state is displayed while the machine tool is in operation, there is a problem that MTTR (average recovery (repair) time) increases when a person who does not know the measure corresponding to the abnormality is working. . In order to cope with this problem, an example of a technique for displaying a three-dimensional shape model of a machine tool that has been simulated in synchronization with the operation of the machine tool and informing a measure corresponding to the abnormality has been disclosed ( For example, see Patent Document 1).
JP 2006-085328 A

  However, even if the technique disclosed in Patent Document 1 is used, the information stored for the simulation operation is only the time and position after starting the machining operation for each part. For example, when a servo axis collides due to the operation of the servo shaft and the machine becomes abnormal, it is difficult to determine whether it is abnormal or normal because only the time and position information does not know the operation status of the hydraulic system.

  Further, the simulation operation in the technique disclosed in Patent Document 1 needs to be manually associated with which machining operation (command) and at which position, and must be synchronized with the operation of the machine tool. was there. According to the former, it takes time to investigate the cause of the abnormal operation, and according to the latter, it is necessary to operate the machine tool synchronously even when notifying the measure corresponding to the abnormality or investigating the cause of the abnormal operation. was there.

  The present invention has been made in view of the above points, and it is easier to investigate the cause of abnormal operation than in the past, and it can be performed in a short time, and the machine tool can perform simulation of machining operation separately from the machine tool. The purpose is to provide a monitoring system.

(1) Means for solving a problem (hereinafter, simply referred to as “solution means”) 1 is a monitoring device that is connected to a machine tool and is communicably connected to the machine tool and monitors a machining operation of the machine tool. A processing system for a machine tool equipped with a machining command information such as a signal or numerical value to control a machining operation, and a machining execution information such as a signal or a numerical value obtained by the executed machining operation, Information storage means for storing the machine tool, and the machining operation of the machine tool based on the machining command information stored in the information storage means, and the machining execution information obtained by the control is associated with the machining command information Machining of the machine tool on the command and actual machining based on machining control means stored in the information storage means and machining command information and machining execution information stored in the information storage means And summarized in that and a reproduction display means for reproducing and displaying on the display unit by simulation in association with work.

  A signal, a numerical value, or the like in the machining command information and the machining execution information is arbitrary as long as it is information that can grasp the operation state of the machine tool. For example, it corresponds to CNC (Computer Numerical Control) and PLC (Programmable Logic Control), and may include operation information related to operation of the control panel, detection information described later, imaging information, and the like as necessary. According to the solution means 1, since the machining command information and the machining execution information are stored in association with each other, the reproduction display means associates the machining operation of the machine tool with respect to the command and the actual machining and reproduces and displays it on the display unit by simulation. can do. This reproduction display does not need to be activated and synchronized with the machine tool, and can be performed at any time separately from the machine tool. As a mode of reproducing and displaying in association with each other, for example, they are displayed side by side or displayed in a superimposed manner. Since the machining command information and the machining execution information include at least CNC and PLC, the operation state of the machine tool at the time of machining can be grasped, and it is possible to easily specify at which point during machining an abnormality has occurred. In addition, if the simulation of the machining operation is reproduced and displayed by associating the command with the actual machining, if there is a part where the machining operation on the actual machining is different from the machining operation on the command, the cause of the abnormal operation is investigated. This is a clue. Therefore, since it is not necessary to perform the association manually, the time required to investigate the cause of the abnormal operation is shorter than before.

(2) The solution means 2 is a monitoring system for a machine tool described in the solution means 1, and an information storage means is composed of a first storage unit provided in the machine tool and a second storage unit provided in the monitoring device. In this case, the machining control means stores the machining execution information stored in the first storage unit when the usage rate of the machine tool becomes a predetermined value or less after storing the machining execution information in the first storage unit. The gist is to transfer and store the data in the second storage unit.

  In general, the storage capacity that can be mounted on a machine tool in the field is suppressed, and the storage capacity that can be mounted on a processing apparatus such as a monitoring apparatus is generally not so limited. In the solving means 2, the machine tool includes the first storage unit, the monitoring device includes the second storage unit, and the processing control unit temporarily stores the processing execution information in the first storage unit, and then stores the second storage unit. Transferred to the unit and stored. However, the storage capacity of the first storage unit is limited without restricting the operation of the machine tool by limiting the transfer to the usage rate of the machine tool being equal to or less than a predetermined value (in other words, during the idle time of the machining process). Even if the processing execution information has a capacity exceeding 5,000, it can be reliably stored in the second storage unit.

(3) The solving means 3 is a monitoring system for a machine tool described in the solving means 1 or 2, and the machining control means is a machining time for each process in a machining operation consisting of a plurality of processes (hereinafter, this machining time is simply referred to as a machining time). It is referred to as “switching time”) and one or both of the difference values from the machining command information is stored in the information storage means as machining execution information.

  When the time actually taken is longer than the machining time in which the commanded machining operation is performed for a certain process, there is a possibility that the cause of the abnormal operation is included in the process. Further, the larger the difference value between the machining command information and the machining execution information, the more the deviation occurs, which may cause an abnormal operation. According to the solution 3, when the switching time is used, it is possible to greatly reduce the amount of information to be stored and easily identify a process that may include the cause of the abnormal operation. Further, when the difference value is stored, the storage amount is not reduced, but the cause of the abnormal operation can be easily determined by looking at the change (increase / decrease) in the difference value.

(4) The solution means 4 is a monitoring system for a machine tool according to any one of the solution means 1 to 3, and includes a detection means for detecting an operating environment of the machine tool, The detection information detected by the detection means is included in the machining execution information and stored in the information storage means, and the reproduction display means associates the machining operation of the machine tool with respect to the command and the actual machining based on the detection information. The gist is to reproduce and display on the display unit by simulation.
The detection means corresponds to, for example, a temperature sensor, an atmospheric pressure sensor, a pressure sensor, or the like.

  According to the solution means 4, since the operation environment such as temperature, pressure, pressure, etc. in the machine tool is detected by the detection means, the machining operation of the machine tool is reproduced and displayed by simulation together with the detected detection information. If the operation is abnormal due to large changes (increase / decrease) in temperature, atmospheric pressure, pressure, etc., the cause can be easily investigated.

(5) The solution means 5 is a monitoring system for a machine tool according to any one of the solution means 1 to 4, and is provided in the vicinity of the machine tool or the machine tool. The processing control unit includes the imaging information captured by the imaging device in the processing execution information and stores the processing information in the information storage unit, and the reproduction display unit includes the simulation of the processing operation. The gist is to reproduce and display on the display unit based on the imaging information included in the processing execution information.

  According to the solution means 5, the machining operation of the machine tool is reproduced and displayed by simulation together with the imaging information (image and video) captured by the imaging device. If an abnormal operation occurs due to a change in the image or video (for example, an object falling or flying), the cause can be easily investigated.

(6) The solution means 6 is the monitoring system for the machine tool described in any one of the solution means 1 to 5, and the machining control means is configured such that a difference value between the machining command information and the machining execution information is outside an allowable range. Then, the gist is to start storing the processing execution information in the information storage means.
Although the setting of the allowable range is arbitrary, it is desirable to set an error range that occurs in general processing, for example.

  According to the solving means 6, since the machining execution information is stored in the information storage means only when the difference value between the machining command information and the machining execution information is outside the allowable range, the capacity of the machining execution information can be reduced. . Therefore, the storage capacity required for the information storage means is also reduced.

(7) The solving means 7 is the monitoring system for the machine tool described in any one of the solving means 1 to 6, and the reproduction display means is performed in the past with machining execution information of the machining operation to be processed. The gist is to display statistical information based on machining execution information of the same type of machining operation.

  According to the solving means 7, by displaying the statistical information related to the machining execution information, how much difference (for example, error and displacement amount) the machining operation to be performed becomes compared with the machining operation of the same type performed in the past. Etc.). As a result, it is possible to predict how many times the same type of machining operation will be performed, and the abnormal operation will occur, and the statistical information becomes a clue when investigating the cause of the abnormal operation.

(8) The solving means 8 is the monitoring system for a machine tool described in any one of the solving means 1 to 7, and the gist is that the monitoring device is arranged in a remote place away from the machine tool.

  According to the solution 8, even when the machine tool and the monitoring device are remotely located, the cause of the abnormal operation can be determined by finding the difference in operation between the command and the actual machining.

  According to the present invention, not only can the cause of abnormal operation be determined more easily and in a short time, but also a machining operation can be simulated separately from the machine tool.

  The best mode for carrying out the present invention will be described with reference to the drawings.

  First, FIG. 1 schematically shows a configuration example of the present invention in a block diagram. The monitoring system of the present invention comprises a machine tool 10 and a monitoring device 20 connected through a communication line N. An arbitrary line can be applied as the communication line N. For example, any one of a LAN, a dedicated line, the Internet, and the like is applicable. The arrangement relationship between the machine tool 10 and the monitoring device 20 is arbitrary, and may be integrated in one housing, may be arranged in the vicinity, or may be arranged in a remote place. The machine tool 10 includes an information storage unit 11, a processing control unit 14, a detection unit 15, an imaging device 16, and the like. The monitoring device 20 includes a reproduction display unit 21 and a display device 22.

The information storage unit 11 stores machining command information 12 such as signals and numerical values that are used as a basis for controlling the machining operation, and machining execution information 13 such as signals and numeric values obtained by the executed machining operation. The machining command information 12 and the machining execution information 13 use information that can grasp the operation state of the machine tool 10 such as CNC and PLC. For example, a hard disk device or a magneto-optical disk device is used as the information storage means 11, but the type and portability are not limited as long as the processing command information 12 and the processing execution information 13 can be stored.
Note that the information storage unit 11 may be configured by a first storage unit 11 a provided in the machine tool 10 and a second storage unit 11 b (shown by a two-dot chain line) provided in the monitoring device 20. In this configuration, one or both of the machining command information 12 and the machining execution information 13 are stored.

  The machining control unit 14 controls the machining operation of the machine tool 10 based on the machining command information 12 stored in the information storage unit 11, and associates the machining execution information 13 obtained by the control with the machining command information 12. Store in the storage means 11. The detection means 15 detects the operating environment (temperature, atmospheric pressure, pressure, etc.) of the machine tool 10, and corresponds to, for example, a temperature sensor, an atmospheric pressure sensor, a pressure sensor, or the like. The imaging device 16 is provided in the machine tool 10 or in the vicinity of the machine tool 10 and images one or both of the machine tool 10 and the machining operation.

  The reproduction display means 21 reproduces and displays the machining operation of the machine tool 10 on the display device 22 by simulation based on the machining command information 12 and the machining execution information 13 stored in the information storage means 11. Although the specific configuration is well known and omitted, for example, the machine tool 10 is divided into a plurality of parts (that is, tools, chucks, workpieces, control panels, etc.), and identification data and shape data (2D or 3D) for each part. ), Storing part information including initial position coordinate data and the like. And based on each of the process command information 12 and the process execution information 13, it converts into the coordinate of the part corresponded to corresponding identification data, and displays a shape model by operation | movement by simulation. As the display device 22 corresponding to the display unit, any type can be applied as long as it can reproduce and display a simulation. For example, a liquid crystal display or a plasma display is used for the display device 22. For example, it may be configured as a single unit, may be configured in an operation panel or a control panel provided in the machine tool 10, or may be configured in a display device provided in the monitoring device 20.

  Next, an example of the machine tool 10 applied to a grinding apparatus that grinds a cylindrical workpiece W with a grindstone 36 will be described with reference to FIG. The workpiece W of this example has two grinding parts Wa and Wb. As shown in FIG. 2, the machine tool 10 includes a control device 30, a sizing device 31, a work jig 32, a rotational movement mechanism 33, a grindstone table 34, a detection unit 15, an imaging device 16, and the like. All devices, mechanisms, and the like except the control device 30 operate according to a signal transmitted from the control device 30. The same elements as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.

  The control device 30 includes a CPU, a ROM, a RAM, and the like, and the functions of the processing control unit 14 and the like described above are realized by the CPU executing a program stored in the ROM. The sizing device 31 measures the cylindrical diameter (that is, the diameter) of the workpiece W and transmits a measurement data signal to the control device 30. The workpiece jig 32 holds the workpiece W for grinding, exchanges with the workpiece W to be processed next, and rotates the workpiece W in accordance with a grinding process including a plurality of processes.

  The rotational movement mechanism 33 has an encoder 38, and rotates the grindstone 36 or moves it in the direction of arrow D3 (left and right direction in the drawing) in accordance with the positions of the grinding parts Wa and Wb. That is, when grinding the grinding part Wa, it is moved to the position indicated by the solid line, and when grinding the grinding part Wb, it is moved to the position indicated by the two-dot chain line. The encoder 38 transmits a signal for detecting the current position of the grindstone 36 to the control device 30.

  The grindstone base 34 has an encoder 37 and is equipped with a rotational movement mechanism 33, and moves on the rail 35 in the arrow D1 direction (up and down direction in the drawing). The encoder 37 transmits a signal for detecting the position of the grinding wheel base 34 (corresponding to a feed amount in FIG. 3 described later) to the control device 30. Note that the detection means 15 in this example uses a temperature sensor and an atmospheric pressure sensor, and the imaging device 16 arranges the grinding stone 36 so that the process of grinding the grinding portions Wa and Wb can be imaged.

  The workpiece W is ground by the grindstone 36. After the workpiece W is held on the workpiece jig 32, the grindstone 36 grinds the grinding portions Wa and Wb according to the grinding process (grinding cycle), and then the workpiece W after the grinding is finished. The procedure of exchanging with the workpiece W to be ground is repeated. The grindstone 36 usually starts rotating immediately before entering the grinding process, and is stopped when the grinding process is completed. In the case of grinding a plurality of workpieces W in succession, rotation may be started immediately before grinding the first workpiece W, and may be stopped after the last workpiece W has been ground.

  An example of a grinding process (grinding cycle) will be described with reference to FIG. Since the grinding parts Wa and Wb are both performed in the same grinding process, the grinding part Wa will be described as a representative in this example. First, as shown in FIG. 2, the grindstone 36 is at the retracted position d1 and is fast-forwarded and advanced in a direction approaching the grinding portion Wa (from time t1 to time t2). Subsequently, an empty grinding is performed at a grinding speed (from time t2 to time t3), and when the outer diameter position d2 of the grinding portion Wa is reached, rough grinding is performed (from time t3 to time t4). If the grinding depth position d3 of the rough grinding is reached during the rough grinding, the sizing device 31 transmits a signal AS1 to the control device 30.

  The control device 30 that has received the signal AS1 changes the feed amount, performs dwelling (processing in a state in which feeding is stopped) (from time t4 to time t5), and then performs precise research (from time t5 to time t6). . When the grinding grinding depth position d4 is reached during the rough grinding, the sizing device 31 transmits a signal AS2 to the control device 30. Receiving the signal AS2, the control device 30 changes the feed amount again and performs fine grinding (from time t6 to time t7). When the grinding depth position d5 of the fine grinding is reached during this fine grinding, the sizing device 31 transmits a signal AS3 to the control device 30. Upon receiving the signal AS3, the control device 30 performs the finishing process by the dwell (from time t7 to time t8) and then quickly returns the grindstone 36 to the retracted position d1 to finish the grinding process (from time t8 to time t9). ).

  An example of a procedure of processing control processing executed by the control device 30 when grinding the workpiece W by the above-described grinding process will be described with reference to FIG. Since the machining control process shown in FIG. 4 is a procedure performed on one workpiece W, the machining control process may be repeatedly executed for the plurality of workpieces W by a corresponding number.

  First, the processing operation of the grinding process is controlled based on the processing command information 12 [Step S10], and processing execution information 13 during this control is obtained [Step S11]. The machining command information 12 corresponds to CNC, PLC, and the like, and includes, for example, a position command and a tool change command. The processing execution information 13 corresponds to CNC, PLC, and the like. If necessary, the position information of the grindstone 36 (that is, the position feedback value obtained by the encoders 37 and 38), the operation information related to the operation of the control panel (including images), Operation information such as the presence / absence or operation amount of the oil pressure system unit, the detection information of the detection means 15, the imaging information captured by the imaging device 16, and the like may be appropriately included. Instead of the machining execution information 13, if necessary, a difference value between the machining command information 12 and the machining execution information 13 may be obtained [step S12].

  Then, the machining execution information 13 and the difference value are stored in the information storage means 11 in association with the machining command information 12 [step S13]. This association is arbitrary as long as the simulation of the machining operation is synchronized between the command and the actual machining, or if the relevance is clear even when asynchronous. For example, it is stored in a table format, or is associated using a link or a pointer.

  An example in which the machining command information 12 and the machining execution information 13 are associated and stored in the information storage unit 11 will be described with reference to FIG. FIG. 5 is an example stored in a table format, and the original machining command information 12 and machining execution information 13 are CNC, PLC, etc., respectively, but the movement of the grindstone 36 to be moved with respect to the workpiece W for simplicity. It represents only the quantity.

  Referring to each row of FIG. 5, machining command information 12, machining execution information 13, switching time, and operating environment (temperature and pressure) are stored for each process. For example, in the first roughing, there is no movement or switching time when the machining execution information 13 is “100.0000 mm” and the switching time is “100.0000 mm” for the machining command information 12 (in parentheses for reference). It represents the elapsed time from the start of the fast-forward advance of the grindstone 36.) The temperature is “20.0 ° C.” and the atmospheric pressure is “1010.8 hPa”. Similarly, in the third rough grinding, when the machining command information 12 is “150.0000 mm”, the machining execution information 13 is “149.98787 mm”, the switching time is “25 seconds”, and the temperature is “20”. .1 ° C. ”and the atmospheric pressure is“ 1001.3 hPa ”. As described above, the information storage means 11 stores various types of information obtained corresponding to the machining command information 12.

  Returning to FIG. 4, steps S11 to S13 described above are repeated until a signal (AS1, AS2, AS3, etc.) is received from the sizing device 31 (NO in step S14). When the signal is received (YES in step S14), the switching time is obtained and stored in the information storage means 11 [step S15]. Only when the usage rate per unit time becomes equal to or less than the predetermined value (YES in step S16), the machining execution information 13 and the like stored in the first storage unit 11a are transferred to the second storage unit 11b [step S17. ]. Steps S11 to S17 described above are repeated until the entire grinding process is completed for one workpiece W [Step S18].

  As shown in FIG. 5, based on the information stored in the information storage unit 11, the monitoring device 20 causes the reproduction display unit 21 to reproduce and display the processing operation of the grinding process in the machine tool 10 on the display device 22 by simulation. Normally, the information storage means 11 is provided in the monitoring device 20, but when the information storage means 11 is provided in the machine tool 10, the reproduction display means 21 performs reproduction display while accessing via the communication line N. In the reproduction display, for example, parts such as the work jig 32, the work W, the rotational movement mechanism 33, and the grindstone 36 shown in FIG. 2 are stored in advance. Then, the coordinates of the parts corresponding to the corresponding identification data are converted based on the information shown in FIG. 5, and the shape model of each part is displayed in motion by simulation. An example of the operation display in the simulation is shown in FIG.

  The display example shown in FIG. 6 is a screen example in the middle of the simulation, specifically, the roughing process in the third line of FIG. The display device 22 synchronously displays a display window 22a that displays a simulation operation based on the processing command information 12 and a display window 22b that displays a simulation operation based on the processing execution information 13, and Each data (upper part of the screen), processing temperature information, and atmospheric pressure (lower part of the screen) of the processing command information 12 and the processing execution information 13 during operation are displayed. As long as the relationship between the command and the actual machining is clear, such as alternately reproducing and displaying each step of the machining operation (or every multiple steps) on the command and actual machining, it is asynchronous. Playback display may also be performed. Furthermore, synchronous reproduction display and asynchronous reproduction display may be mixed. Further, although not shown, it is desirable to display the imaging information by the imaging device 16 in a separate display window simultaneously with the simulation operation display.

  In the roughing process on the third line, there is a deviation because the machining execution information 13 is a movement of “149.98787 mm” with respect to the movement of the machining command information 12 of “150.0000 mm”. This shift is displayed in synchronization with the simulation operation display, so that the tip position of the grindstone 36 displayed in the display window 22a and the tip position of the grindstone 36 displayed in the display window 22b are different in the vertical direction of the drawing. Appears (shifts are indicated by broken lines). Knowing these gaps can be a clue when investigating the cause of abnormal operation.

According to the embodiment described above, the following effects can be obtained.
(1) Since the processing command information 12 and the processing execution information 13 include at least CNC and PLC and are stored in association with each other in the information storage means 11 (see FIG. 5), the reproduction display means 21 is a machine tool. Even when the 10 machining operations are simulated, the command and actual machining can be associated with each other and reproduced and displayed on the display device 22 (see FIG. 6). This replay display shows, for example, the operating status of the oil pressure system unit, so that it can be known whether the grindstone 36 has stepped on the end of the workpiece W, and this causes the abnormal operation of the servo shaft to operate and cause a collision easily. Can be found. Further, there is no need to operate and synchronize the machine tool 10 for reproduction display, and it can be performed at any time separately from the machine tool 10. Since the simulation of the machining operation can be related to the command and the actual machining can be reproduced and displayed, if there is a part where the machining operation on the actual machining is different from the machining operation on the command, investigate the cause of the abnormal operation This is a clue. Therefore, since it is not necessary to perform the association manually, the time required to investigate the cause of the abnormal operation is shorter than before.

(2) Since the transfer of information is limited when the usage rate of the machine tool 10 is equal to or less than a predetermined value (that is, during the idle time of the machining process) (see steps S16 and S17 in FIG. 4), Without restricting the operation, even the machining execution information 13 having a capacity exceeding the storage capacity of the first storage unit 11a can be reliably stored in the second storage unit 11b. That is, information transfer can be performed in accordance with the fact that the storage capacity that can be mounted on the machine tool 10 is reduced.

(3) Since the switching time (that is, the machining time of each process in a machining operation consisting of a plurality of processes) is stored in the information storage means 11 as the machining execution information 13 (see FIG. 5), switching is performed together with the simulation reproduction display of the machining operation. Time can be displayed (see FIG. 6). Thereby, it is possible to easily identify a process that may include the cause of the abnormal operation. That is, the longer the switching time is, the worse the grindstone 36 (tool) sharpness is. If the machining is attempted within the specified time, the workpiece W is pressed against the workpiece W, and some adverse effect (for example, rattling of the workpiece jig 32) occurs on the clamping jig. Therefore, by managing the switching time, it is possible to easily determine the timing at which the grindstone 36 (tool) should be replaced. Note that if the actual processing information is eliminated and only the switching time is stored in the information storage unit 11, the amount of information stored in the information storage unit 11 can be significantly reduced.

(4) Since the operating environment such as temperature and pressure in the machine tool 10 is detected by the detection means 15 (see FIG. 5), the machining operation of the machine tool 10 can be reproduced and displayed by simulation together with the detected detection information (FIG. 6). See). If the operation is abnormal due to large changes (increase / decrease) in temperature and pressure, the cause can be easily determined. In this example, a temperature sensor and an atmospheric pressure sensor are used as the detection means 15, but other sensors (for example, a pressure sensor, a magnetic sensor, a displacement sensor, a humidity sensor, etc.) may be used.

(5) If the imaging device 16 is provided in the machine tool 10 itself or in the vicinity thereof, and the captured imaging information is included in the processing execution information 13 and stored in the information storage unit 11, a specific situation that cannot be understood only by reproduction display by simulation ( For example, the fall or flying of an object) may become apparent. If an abnormal operation occurs with a change that appears in an image or video, the cause can be easily investigated.

(6) Even when the machine tool 10 and the monitoring device 20 are remotely located, the cause of the abnormal operation can be investigated by finding the difference in operation between the command and the actual machining.

[Other Embodiments]
Although the best mode for carrying out the present invention has been described above, the present invention is not limited to this mode. In other words, various forms can be implemented without departing from the scope of the present invention. For example, the following forms may be realized.

(1) In the above-described embodiment, the information storage means 11 stores the switching time, temperature / atmospheric pressure together with information obtained by the machining operation executed in response to the machining command information 12 (that is, the machining execution information 13). (See FIG. 5). Instead of (or in addition to) this form, the information storage means 11 may store the difference value between the machining command information 12 and the machining execution information 13, the switching timing, the elapsed time from the machining start time, and the like. (See FIG. 7).
In the example of the stored contents shown in FIG. 7, the processing command information 12, the difference value, the switching, and the operating environment are associated in order from the left. “AS 1”, “AS 2”, and “AS 3” shown in the switching column are all examples of data contents included in the signal transmitted from the sizing device 31. This data makes it clear which switching was performed at which timing.

  When the machining operation in the machine tool 10 is reproduced and displayed on the display device 22 by simulation based on the stored contents shown in FIG. 7, the result is as shown in FIG. FIG. 8 shows a display example instead of FIG. 6, specifically, the roughing process in the third line of FIG. 7. In the display device 22 of this example, a display window 22c that reproduces and displays a simulation of the machining operation and a display window 22d that displays information other than the difference value are displayed in synchronization. It should be noted that the point of asynchronous reproduction and display and the point of displaying the imaging information by the imaging device 16 in a separate display window are the same as in the above-described embodiment.

  In the display window 22c, a simulation of machining operation based on the machining command information 12 (illustrated by a two-dot chain line in this example) and a simulation of machining operation based on a difference value (illustrated by a solid line in this example) are displayed in a superimposed manner. To do. Since the processing operations on one side are often visible when they are simply overlapped, it is desirable to reproduce and display the processing operations on the other side in other forms (for example, transparent, translucent, diagram only, etc.). If there is a deviation in the position or direction of the workpiece W, the grindstone 36, or the like when displaying them in a superimposed manner, they are also displayed as deviations in the display window 22c. In this example, the tip position of the grindstone 36 is misaligned between the two-dot chain line and the solid line, and the misalignment on the display is a clue when investigating the cause of the abnormal operation depending on the direction and position.

  Further, in the display window 22d, changes in temperature (illustrated by a solid line) and atmospheric pressure (illustrated by an alternate long and short dash line) are displayed in a graph, the switching timing (illustrated by a vertical solid line) is displayed, and an elapsed time from the start of machining (broken line) Is displayed). Along with the simulation of the machining operation displayed on the display window 22c, the temperature / atmospheric pressure change and switching timing can be observed. By displaying it in a graph, it is possible to grasp at a glance changes in the operating environment during machining (especially rapid changes). Therefore, it becomes easier to investigate the cause of abnormal operation than in the past.

(2) In embodiment mentioned above, it applied to the grinding device which grinds the workpiece | work W with the grindstone 36 as the machine tool 10 (refer FIG. 2). It may replace with this form and may be applied to other machine tools. Examples of the other machine tools include each machine tool for processing (for example, cutting processing, lathe / planar cutting tool machining, etc.) performed by contacting the workpiece to be processed, electric discharge processing, laser processing, and the like. . Regardless of the machine tool, it is possible to replay and display the simulation of the machining operation on the command and on the actual machining, so if there is a part where the machining operation on the actual machining is different from the machining operation on the command, This is a clue when investigating the cause of abnormal operation. Therefore, since it is not necessary to perform the association manually, the time required to investigate the cause of the abnormal operation is shorter than before.

(3) In the above-described embodiment, the machining execution information stored in the first storage unit 11a is stored in the second storage unit 11b only when the usage rate per unit time in the machine tool 10 becomes a predetermined value or less. The transfer is configured (see steps S16 and S17 in FIG. 4). Instead of this configuration, as long as the upper limit of storage of the first storage unit 11a is not reached, one or two or more processes are performed after a machining operation is completed for each workpiece W or a machining operation including a plurality of processes. It is good also as a structure which transfers the process execution information etc. which were memorize | stored in the 1st memory | storage part 11a to the 2nd memory | storage part 11b whenever it complete | finishes. Even with this configuration, the machining execution information 13 can be reliably stored in the second storage unit 11b without restricting the operation (machining process) of the machine tool 10.

(4) In the above-described embodiment, only the amount of movement of the grindstone 36 that moves each information of the machining command information 12 and the machining execution information 13 (difference value) with respect to the workpiece W is represented (FIGS. 5 and 7). reference). Instead of (or in addition to) this form, all or part of the members that can move (for example, the movement amount and rotational speed in the direction of arrow D3 shown in FIG. 2 for the grindstone 36, the rotational speed for the workpiece W, etc.) It is good also as a structure memorize | stored with identification data. By storing information about various members that can move during processing, it becomes easy to find out which member caused the abnormal operation.

It is a block diagram showing typically the example of composition of the present invention. It is a figure which represents typically the structural example of the machine tool applied to the grinding apparatus. It is a figure explaining an example of a grinding process (grinding cycle). It is a flowchart showing the example of a procedure of a process control process. It is a figure explaining the example memorize | stored in an information storage means. It is a figure showing the operation | movement display example of simulation. It is a figure explaining the example memorize | stored in an information storage means. It is a figure showing the operation | movement display example of simulation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Machine tool 11 Information storage means 11a 1st memory | storage part 11b 2nd memory | storage part 12 Process command information 13 Process execution information 14 Process control means 15 Detection means 16 Imaging device 20 Monitoring apparatus 21 Reproduction display means 22 Display apparatus 30 Control apparatus 31 Fixed Dimensions device (measuring means)
32 Work jig 33 Rotational movement mechanism 34 Grinding wheel base 35 Rail 36 Grinding wheel 37, 38 Encoder N Communication line W Work Wa, Wb Grinding part d1 Retraction position d2 Outer diameter position d3, d4, d5 Grinding depth position

Claims (8)

A monitoring system for a machine tool, comprising a machine tool and a monitoring device connected to the machine tool so as to be communicable and monitoring a machining operation of the machine tool,
Information storage means for storing machining command information such as signals and numerical values for controlling machining operations and machining execution information such as signals and numeric values obtained by executed machining operations;
Machining control for controlling the machining operation of the machine tool based on the machining command information stored in the information storage means and storing the machining execution information obtained by the control in the information storage means in association with the machining command information Means,
Based on the machining command information and the machining execution information stored in the information storage unit, a reproduction display unit that associates the machining operation of the machine tool with respect to the command and the actual machining and reproduces and displays it on the display unit by simulation. A monitoring system for machine tools. A monitoring system for a machine tool according to claim 1,
In the case where the information storage unit is configured by the first storage unit provided in the machine tool and the second storage unit provided in the monitoring device, the processing control unit stores the processing execution information in the first storage unit, A monitoring system in a machine tool that stores processing execution information stored in the first storage unit to the second storage unit when the usage rate of the machine tool becomes a predetermined value or less. A monitoring system for a machine tool according to claim 1 or 2,
The processing control means is a monitoring system in a machine tool that stores in the information storage means one or both of the difference values between the processing time of each step and the processing command information in a processing operation consisting of a plurality of steps as processing execution information. A monitoring system for a machine tool according to any one of claims 1 to 3,
Having detection means for detecting the operating environment of the machine tool;
The processing control means includes the detection information detected by the detection means in the processing execution information and stores it in the information storage means,
The reproduction display means is a monitoring system in a machine tool that reproduces and displays on a display unit by simulation by associating machining operations of the machine tool on the command and actual machining based on the detection information. A monitoring system for a machine tool according to any one of claims 1 to 4,
A machine tool or an imaging device provided in the vicinity of the machine tool for imaging one or both of the machine tool and the machining operation;
The processing control means includes the imaging information captured by the imaging device in the processing execution information and stores it in the information storage means,
The reproduction display means is a monitoring system in a machine tool that reproduces and displays on a display unit based on imaging information included in machining execution information together with a simulation of machining operation. A monitoring system for a machine tool according to any one of claims 1 to 5,
When the difference value between the machining command information and the machining execution information falls outside the allowable range, the machining control means is a monitoring system for a machine tool that starts storing the machining execution information in the information storage means. A monitoring system for a machine tool according to any one of claims 1 to 6,
The reproduction display means is a monitoring system that displays statistical information on the basis of machining execution information of a target machining operation and machining execution information of the same type of machining operation performed in the past. A monitoring system for a machine tool according to any one of claims 1 to 7,
The monitoring device is a monitoring system located at a remote location away from the machine tool.

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