Machining result display method and machining result display device for machine tool

Abstract

To provide a machining result display method and a machining result display device for a machine tool that allows an operator to easily analyze factors of machining delay or progress by displaying a list of a machining time result and standard machining time for each machining step or each tool of the machining step.SOLUTION: A machining result display method for a machine tool, which completes machining of a work-piece W through one or more machining steps in which each machine tool performs machining by sequentially exchanging a plurality of tools TL using one or more machining centers 26A and 26B is characterized by: measuring and recording machining times TM1, TM2, and TM3 for each tool TL in each machining step; cumulatively displaying the recorded machining times TM1, TM2, TM3 in a time series in a graph in which the machining times can be identified for each of the tools TL in at least one machining step of at least one machine tool; and displaying a preset standard machining time EMT on the same time axis as the graph.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a machining performance display method and a machining performance display device for a machine tool. [Background technology]

[0002] Machining time, which is one of the factors of productivity of machine tools, changes under various conditions, that is, machining time advances or delays. For example, when machining tens or hundreds of the same workpieces with one machining program, in the initial stage of the machining cycle when the machining program is executed for the first time, an operator call command is written at each key point of the machining program, and the operator may interrupt the machining each time to check the machining state and machining dimensions, or partially modify the machining program. Even if the machining cycle enters a stable period by machining a certain number of workpieces, the machine tool may suddenly stop due to an alarm of overload or abnormal vibration, for example, and the operator may intervene and switch the operation mode to manual to restore it. Even if there is no alarm, the automatic function of the machine tool may override the feed rate and spindle speed, decelerating the machine to solve the problem. For this reason, a difference may occur between the planned standard machining time and the actual machining time.

[0003] In this regard, Patent Document 1 discloses a control device for a machine tool that focuses on measuring the time for each tool, grasps the cycle time for each tool and the cutting time for each tool, and verifies the automatic operation time for improving work. This makes it possible to grasp at a glance whether the machine tool is operating within the normal range, which tool's cycle time is longer than the reference value, which tool's cutting time has a problem, etc. However, in order to more quantitatively evaluate and analyze the productivity of the machine tool, it is desirable to be able to compare the standard machining time with the actual machining time for each machining process. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4312047 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above circumstances, an object of the present invention is to provide a machining performance display method and a machining performance display device for a machine tool, which display a list of the actual machining time for each machining process or for each tool in a machining process, and the standard machining time, allowing an operator to easily analyze the causes of delays or advances in machining. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a method for displaying the machining performance of a machine tool, which uses one or more machine tools to complete machining of a workpiece through one or more machining processes in which each machine tool sequentially changes between multiple tools, wherein the machining time for each tool is measured and recorded in each machining process, the recorded machining time is cumulatively displayed in chronological order on a graph that is identifiable for each tool in at least one machining process of at least one machine tool, and a preset standard machining time is displayed on the same time axis as the graph.

[0007] Furthermore, according to one aspect of the present invention, there is provided a method for displaying the machining performance of a machine tool, which uses one or more machine tools to complete machining of a workpiece through one or more machining steps in which each machine tool sequentially changes tools to perform machining, wherein in each machining step, the cutting time and non-cutting time of the machining time for each tool are measured and recorded separately, and in at least one machining step of at least one machine tool, the recorded cutting time and non-cutting time are cumulatively displayed in chronological order on a graph that is distinguishable for each tool, and graphs decomposed into cumulative time for cutting time only and cumulative time for non-cutting time only are displayed side by side, and a preset standard machining time is displayed on the same time axis as the graphs.

[0008] According to one aspect of the present invention, there is provided a machining performance display device for a machine tool that uses one or more machine tools to complete machining of a workpiece through one or more machining processes in which each machine tool sequentially changes tools to perform machining, the machine tool having: a measurement recording unit that measures and records the machining time for each tool in each machining process; and a display unit that cumulatively displays the recorded machining time in chronological order on a graph that is identifiable for each tool, in at least one machining process of at least one machine tool, and displays a preset standard machining time on the same time axis as the graph. Effect of the Invention

[0009] According to a method for displaying machining results of a machine tool according to one aspect of the present invention, one or more machine tools are used, and in one or more machining processes in which each machine tool performs machining by sequentially replacing multiple tools, the machining time for each tool is measured and recorded. Furthermore, in at least one machining process of at least one machine tool, the recorded machining time is cumulatively displayed in chronological order on a graph in which each tool can be identified, and a preset standard machining time can be displayed on the same time axis as the graph. Therefore, the machining time results for each machining process or for each tool in a machining process, and the standard machining time can be displayed in a list. This allows an operator to easily analyze the cause of a delay or advance in machining.

[0010] According to a method for displaying machining results of a machine tool according to one aspect of the present invention, in one or more machining processes in which one or more machine tools are used and each machine tool performs machining by sequentially replacing multiple tools, the cutting time and non-cutting time of the machining time for each tool are measured and recorded separately. Furthermore, in at least one machining process of at least one machine tool, the recorded cutting time and non-cutting time are cumulatively displayed in chronological order on a graph that can be identified for each tool, and graphs decomposed into cumulative time of only cutting time and cumulative time of only non-cutting time are displayed side by side, and a preset standard machining time can be displayed on the same time axis as the graph. Therefore, the cutting time and non-cutting time for each tool in machining one workpiece can be displayed in a list. This allows an operator to easily analyze the cause of a delay or advance in machining.

[0011] According to one aspect of the present invention, the machining performance display device for a machine tool includes a measurement and recording unit that measures and records the machining time for each tool, and a display unit that displays the recorded machining time in a chronological order on a graph that is identifiable for each tool in at least one machining process of at least one machine tool, and displays a preset standard machining time on the same time axis as the graph. Therefore, in one or more machining processes in which one or more machine tools are used and each machine tool performs machining by sequentially replacing multiple tools, the recorded machining time can be displayed in a chronological order on a graph that is identifiable for each tool, and the preset standard machining time can be displayed on the same time axis as the graph. This allows the machining time performance for each machining process or for each tool in the machining process, and the standard machining time to be displayed in a list, allowing the operator to easily analyze the cause of a delay or advance in machining. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 shows a plan view of a production system according to an embodiment. [Diagram 2] FIG. 2 shows a side view of the pallet stocker according to the embodiment. [Diagram 3] FIG. 3 is a block diagram of a machining performance analysis device according to an embodiment. [Figure 4] Figure 4 shows a Gantt chart of the machining time for each tool. [Diagram 5] FIG. 5 shows a Gantt chart of the processing time and the presence or absence of override. [Figure 6] FIG. 6 shows a Gantt chart of cutting time and non-cutting time. [Figure 7] FIG. 7 shows a list of processing times for the same processing with different start times. [Figure 8] FIG. 8 shows a Gantt chart of the machining time and cutting time for each tool for the same machining operation with different start times. [Figure 9] FIG. 9 shows an example of a display of the machining time for each type of workpiece. [Figure 10] FIG. 10 shows an example of the display of the machining time for each workpiece. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a machining performance analysis device 100 as a machining performance display device of a machine tool according to an embodiment will be described with reference to the attached drawings. Similar or corresponding elements are given the same reference numerals, and duplicated explanations will be omitted. For ease of understanding, the scale of the drawings may be changed.

[0014] FIG. 1 shows a schematic plan view of a production system 10 for producing and processing a variety of workpieces. FIG. 2 shows a schematic side view of a pallet stocker (storage shelf) 12. The production system 10 includes a pallet stocker 12 configured as a storage shelf for storing pallets P on which workpieces W are attached and pallets P alone. As shown in FIG. 2, the pallet stocker 12 has a plurality of stock areas S of different heights for storing pallets P, and each stock area S has a pair of leg members Sa for supporting the pallet P. The pallet stocker 12 is electrically connected to a production system control device 110 for managing and controlling the processing process, and is configured to be able to communicate information such as the type and number of workpieces W stored in the pallet stocker 12 with the production system control device 110.

[0015] As shown in Fig. 1, the production system 10 is provided with one or more (two in Fig. 1) machining centers 26A, 26B as machine tools for machining workpieces W. The production system 10 also includes pallet setup devices 34A, 34B (hereinafter referred to as "setup devices 34A, 34B") that allow an operator to attach or remove the workpieces W to or from a pallet P. The setup devices 34A, 34B are electrically connected to a production system control device 110, and are configured to be able to communicate with the production system control device 110 information such as the type and number of workpieces W that have been set up on the pallet P by the setup devices 34A, 34B.

[0016] The production system 10 includes a transport system 14 for transporting a pallet P on which a workpiece W is attached so that the workpiece W can be transferred between the pallet stocker 12, the machining centers 26A, 26B, and one or more setup devices 34A, 34B.

[0017] The conveying system 14 includes a conveying device 18, which includes a cart 16 for horizontally moving a pallet P, a lifting device 20 and a loading platform 22 for vertically moving the pallet P, and a slide device 24 for moving the pallet P to the loading platform 22. The cart 16 is configured to be able to run on rails R installed along the horizontal direction in order to move the workpiece W between the pallet stocker 12, the machining centers 26A and 26B, and the setup devices 34A and 34B. The lifting device 20 is configured to be able to move up and down by a motor M such as a servo motor, and can move the loading platform 22 connected to the lifting device 20 in the vertical direction. Here, the axial direction parallel to the direction in which the cart 16 moves is defined as the X-axis direction. In addition, the horizontal direction perpendicular to the X-axis direction is defined as the Z-axis direction. Furthermore, the direction parallel to the vertical direction in which the lifting device 20 moves up and down is defined as the Y-axis direction.

[0018] The slide device 24 is disposed on the loading platform 22, and has one or more slide members that move in the Z-axis direction relative to the loading platform 22, and forks (both not shown) that can engage with the pallet P. Therefore, the slide device 24 can access the machining centers 26A, 26B, the pallet stocker 12, and the setup devices 34A, 34B via the slide members in order to deliver the pallet P on which the workpiece W is attached.

[0019] The conveying system 14 is electrically connected to the production system control device 110 and is configured to transfer the workpiece W between the pallet stocker 12, the machining centers 26A, 26B, and one or more setup devices 34A, 34B in response to commands from the production system control device 110.

[0020] 1, the machining centers 26A, 26B include a machine tool body 32 and a pallet standby station 36 having a pallet changer PC configured to be able to exchange a pallet P on which an unmachined workpiece W is attached with a pallet P on which a machined workpiece W is attached. The pallet P on which the workpiece W is attached is automatically transferred to the pallet standby station 36 by the slide device 24 of the transport system 14, or is transferred from the pallet standby station 36 to the transport system 14. Furthermore, the machining centers 26A, 26B include an NC device 28 for controlling the NC machining and a tool magazine 30 for storing tools TL to be attached to a spindle 33 of the machine tool body 32.

[0021] As shown in Fig. 3, the machining performance analysis device 100 is configured to obtain information on the execution status including the execution time of the machining program in the NC device 28, i.e., the machining time by the machining centers 26A and 26B and the presence or absence of trouble, and display this information on a machining program execution time information display unit 102 (hereinafter referred to as "execution time information display unit 102") as a display unit. In addition, the machining performance analysis device 100 is configured to allow an operator to analyze the machining performance including the machining time displayed on the execution time information display unit 102 and correct the machining program.

[0022] Specifically, when a machining program is executed in the NC device 28, the NC device 28 transmits machining program runtime information to a machining program runtime information acquisition unit 112 as a measurement and recording unit (F10 in the figure). The machining program runtime information acquired (received) by the machining program runtime information acquisition unit 112 is recorded in a machining program runtime information recording unit 114 as a measurement and recording unit (F20 in the figure). The machining program runtime information here includes a machine tool identifier, start and end times (machining time) of machining for each tool TL, a machining program number being executed, a feed override value, a program stop ON (executing) / OFF (not executed) signal, a tool number (T number) attached to the spindle, an alarm number (if an alarm has occurred), a cutting feed ON (cutting feed in progress) / OFF (non-cutting feed in progress) signal, an NC device operation mode (memory operation mode, MDI mode, edit mode, etc.), and a process identifier.

[0023] The execution time information of the machining program is transmitted to the execution time information display unit 102 (F30 in the figure), and the machining time for each tool is distinguished and displayed in the form of a Gantt chart described later so that the operator can easily analyze the cause of the delay or progress of machining. In the following explanation, the execution time information display unit 102 is explained as a display device incorporated in the machining performance analyzing device 100, but is not limited to this, and may be the display screen of a mobile terminal carried by the operator, the screen of the operation panel of the machining centers 26A, 26B, or the screen of a computer used for process management.

[0024] Furthermore, the execution time information display unit 102 displays information on the execution process (machining program execution process information) in machining recorded in the machining program execution process information recording unit 116 (F40 in the drawing). Here, the machining program execution process information includes process identification information (identifier, name, etc.), workpiece W identification information (identifier, name, etc.), IDs of the executable machining centers 26A, 26B, machining program numbers at the time of process execution in each of the machining centers 26A, 26B, and standard execution time of the machining program (standard machining time EMT).

[0025] The operator who has confirmed the machining results displayed on the execution time information display unit 102 compares and analyzes the machining program execution time information and the machining program execution process information. Specifically, for example, the difference between the actual execution time and the standard execution time is compared. In addition, the machining program execution process information is referenced from the machining center 26A, 26B identifier and the machining program number for the machining program execution time information. Here, the machining program execution time information may include information for identifying the process using the machining program name or a comment in the program. The analysis result is output in a format that the operator can understand, such as a screen output or a report file output. Note that, without being limited to this, the analysis result may be output in a format that can be processed by a computer. The analysis result output in this way includes the machining program execution process information and information on the machining program to be corrected (the entire corrected machining program and / or the correction part).

[0026] The analysis results by the operator are transmitted to the machining program correction unit 120 (F50 in the figure), and the machining program is corrected based on the results. The corrected machining program is transmitted to the NC device 28 of the machining centers 26A and 26B, and the machining program is corrected or rewritten (F60 in the figure). Here, the machining program may be corrected manually by the operator, or automatically by a computer.

[0027] The analysis results by the operator are also transmitted to the machining program execution process information correction unit 118 (F50 in the figure). The machining program execution process information correction unit 118 corrects the machining program execution process information based on the analysis results, and records the corrected machining program execution process information in the machining program execution process information recording unit 116 (F70 in the figure). Specifically, for example, the standard execution time EMT is corrected. Here, the machining program execution process information may be corrected manually by the operator, or may be automatically corrected by a computer.

[0028] Here, the machining program execution information acquisition unit 112, the machining program execution information recording unit 114, the machining program execution process information recording unit 116, the machining program execution process information correction unit 118 and the machining program correction unit 120 are described as being incorporated in the production system control device 110, but this is not limited thereto, and these may be incorporated in the NC device of the machining center, or may be configured separately in a computer independent of the machining center.

[0029] The effects of the machining performance analysis device 100 and machining performance display method according to this embodiment will be described below through the explanation of display examples of the execution time information display unit 102 shown in Figs.

[0030] FIG. 4 shows an example of a display of a machining performance display of one process (corresponding to one machining program) in which, for example, one machining center 26A completes machining of a workpiece W by sequentially replacing a plurality of tools TL1, TL2, TL3, etc. In the figure, there is another tool between the tools TL1 and TL2 that performs machining for a very short time, but it is omitted for convenience of explanation. Specifically, the execution time information display unit 102 cumulatively displays the machining times TM1, TM2, TM3 measured for each tool TL1, TL2, TL3 in the machining process in a chronological order on a Gantt chart that allows identification of each tool TL. In addition, the execution time information display unit 102 can display a list of multiple machining performances with different start times for the same workpiece W in parallel. Furthermore, the Gantt chart can display the standard machining time EMT of the workpiece W, which is set in advance and recorded in the machining program execution process information recording unit 116, on the same time axis as the machining performance.

[0031] In the example shown in Figure 4, the machining results shown in the lower part of the figure (start time: 2023 / 4 / 17 11:00) are compared to other machining results (upper and middle parts of the figure), and the machining times TM2 and TM3 of the tools TL2 and TL3 are similar, while the machining time TM1 of another tool TL1 is longer than other machining results. In addition, it can be seen that the total machining time in the middle part of the figure (start time: 2023 / 4 / 20 12:12) is longer than other machining results (upper and lower parts of the figure) and exceeds the standard machining time EMT.

[0032] In FIG. 5, in addition to the Gantt charts for each tool TL1, TL2, and TL3 shown in FIG. 4, the presence or absence of change in the feed rate override OD can be displayed in a chronological order (Gantt chart). In the example shown in FIG. 5, in the machining in the middle part of the figure (start time: 2023 / 4 / 20 12:12), the feed rate override OD occurred, and it can be understood that this has an effect on the total machining time. In this way, by displaying the machining results in a chronological order (Gantt chart), it is possible to understand what irregular factors are causing the total machining time to be longer or shorter than the standard machining time EMT. The irregular factors referred to here refer to, for example, the presence or absence of an alarm, the presence or absence of a change in the override OD, the presence or absence of a switching of the operation mode, the presence or absence of an operator call, etc. By displaying the machining results in the execution time information display unit 102 in this way, the factors affecting the machining results can be easily analyzed, and productivity can be improved.

[0033] Furthermore, Fig. 6 shows an example of a display in which the cutting time G01 and non-cutting time ST measured for each tool for each machining operation are cumulatively displayed on a Gantt chart. Here, in order to clearly compare the cutting time G01 and non-cutting time ST in the total machining time, graphs decomposed into the cumulative time of just the cutting time G01 and the cumulative time of just the non-cutting time ST can be displayed side by side. Here, G01 is the code number representing the cutting feed in the machining program, and the code number for the non-cutting time ST is G00.

[0034] The top, middle and bottom Gantt charts in Figures 4, 5 and 6 are related to each other, and the reason why the machining time TM1 of the tool TL1 in the bottom is long can be analyzed. The tool TL1 is a measuring tool for determining the reference point of the workpiece W at the start of the machining process. Since the workpiece W is a cast metal and has a large variation in shape and dimensions, the measuring probe is brought close to the workpiece W from the measurement approach start point with cutting feed G01, but the distance to the measurement point of the workpiece W happens to be long, which makes the approach time long. It can also be analyzed why the total machining time is shorter than the top and middle charts despite this. It can be seen that the last tool TL in the machining process in the top and middle charts is not in the bottom chart. The last tool is also a measuring tool, and a sampling investigation is performed to see whether the dimensions of the machined workpiece W are within the allowable range. It can be seen that the top and middle charts are Gantt charts that happened to be at the timing of the sampling investigation, and the bottom chart was at the timing outside of the sampling investigation.

[0035] FIG. 7 shows an example of a list display for comparing the total machining time for the same machining with different start times. It can be seen that the total machining time shown in the upper part of the figure (start time: 2023 / 6 / 14 03:08) is considerably longer than other machining results (middle and lower parts of the figure), and significantly exceeds the standard machining time EMT. According to the machining results analysis device 100 of this embodiment, in order to perform detailed analysis, it is configured to be able to switch the display as shown in FIG. 8. FIG. 8 shows, from the top, Gantt charts of the presence or absence of override OD change, machining time for each tool, cutting time G01 and non-cutting time ST for each tool, and the cumulative time of cutting time G01 and the cumulative time of non-cutting time ST for each machining result. In the example shown in FIG. 8, it can be seen that a long machining waiting time WT occurs in the machining results in the upper part of the figure (start time: 2023 / 6 / 14 03:08). Therefore, during machining during late night hours when the operator is not present, factors such as a shortage of workpieces W to be machined or a malfunction in the machining centers 26A, 26B can be analyzed, and appropriate measures can be taken, such as preparing a sufficient number of workpieces W for machining during the late night hours.

[0036] According to the machining performance analysis device 100 of this embodiment, the machining performance analysis device 100 includes a machining program execution time information acquisition unit 112 and a machining program execution time information recording unit 114 that measure and record the machining times TM1, TM2, and TM3 for each tool TL1, TL2, and TL3. The machining performance analysis device 100 also includes an execution time information display unit 102 that displays the recorded machining times TM1, TM2, and TM3 in a time series on a Gantt chart that can be identified for each tool TL1, TL2, and TL3 in at least one machining process of the machining centers 26A and 26B, and displays a preset standard machining time EMT on the same time axis as the Gantt chart. Therefore, the recorded machining times TM1, TM2, and TM3 for each tool TL1, TL2, and TL3 are displayed in a cumulative manner on the Gantt chart, and can be compared with the preset standard machining time EMT and the machining performance (total machining time). This allows the machining results and standard machining times for each machining step or for each tool TL1, TL2, TL3 in a machining step to be displayed in a list, enabling the operator to easily analyze the causes of delays or advances in machining.

[0037] In addition, according to the machining performance analysis device 100 of this embodiment, in one or more machining processes in which each machining center 26A, 26B sequentially replaces multiple tools TL1, TL2, TL3 to perform machining, the cutting time G01 and non-cutting time ST are cumulatively displayed in chronological order on a Gantt chart that can be identified for each tool TL1, TL2, TL3, and are also displayed on a Gantt chart that is broken down into a cumulative time of only the cutting time G01 and a cumulative time of only the non-cutting time ST, and can be compared with a preset standard machining time EMT. Therefore, the cutting time G01 and non-cutting time ST in machining one workpiece W can be displayed in a list. This allows the operator to easily analyze the cause of the delay or advancement of machining.

[0038] Furthermore, according to the machining performance analysis device 100 of this embodiment, as shown in FIG. 9, the machining time is accumulated for each workpiece W of the same type that has been completed, the total machining time is calculated, and the results of grouping the total machining time in comparison with a preset standard machining time EMT can be displayed. Specifically, for each workpiece W of the same type ("PART-A" to "PART-D" in the figure), a first symbol M1 is displayed, which represents a first group whose total machining time (indicated by the average value "Average" in the figure) was within the range of the standard machining time EMT ("Expected" in the figure). In addition, a second symbol M2 is displayed, which represents a second group whose total machining time was shorter than the range of the standard machining time EMT, and a third symbol M3 is displayed, which represents a third group whose total machining time was longer than the range of the standard machining time EMT. In the display example of FIG. 9, in the case of machining "PART-C" in the figure, it can be immediately confirmed that the numbers of parts corresponding to the first group, second group, and third group are 423, 2, and 2, respectively.

[0039] The lower part of the "PART-C" display shows that two workpieces W were machined between 13:45 on 2023 / 05 / 08 and 14:46 on the same day. At that time, the standard machining time EMT was set to 00:10:20, and the average machining time for the two workpieces was 00:14:19. The two workpieces machined during that period are grouped (classified) as having been machined with a standard machining time EMT of 00:10:22. Because the standard machining time EMT was 00:10:22 and the average machining time was 00:14:19, the symbol M3 indicates that the average machining time is longer than the allowable range of the standard machining time EMT.

[0040] Also, looking at the middle part of the display for "PART-C," the standard machining time EMT was updated to 00:15:27 by the operator or computer at 14:46 on 2023 / 05 / 08. This shows that two workpieces W were machined between 14:46 and 15:28 on the same day. At that time, the standard machining time EMT was set to 00:15:27, and the average machining time was 00:12:30. The two workpieces machined during that period are grouped (classified) as having been machined with a standard machining time EMT of 00:15:27. Since the standard machining time EMT was 00:15:27 and the average machining time was 00:12:30, the symbol M2 indicates that the average machining time is shorter than the allowable range of the standard machining time EMT.

[0041] Furthermore, looking at the upper part of the display of "PART-C", at 11:21 on 2023 / 05 / 09, the standard machining time EMT was updated to 00:12:47 by the operator's judgment or the computer's judgment. It shows that 423 workpieces W were machined during the period from 11:21 on 2023 / 05 / 09 to 21:00 on 2023 / 05 / 12. At that time, the standard machining time EMT was set to 00:12:47, and the average machining time was 00:12:48. The 423 workpieces machined during that period are grouped (classified) as having been machined with a standard machining time EMT of 00:12:47. Since the standard machining time EMT was 00:12:47 and the average machining time was 00:12:48, the symbol M1 indicates that the average machining time was within the tolerance range for the standard machining time EMT (for example, within ±10%).

[0042] The initial value of the standard machining time EMT on the lower screen of "PART-C" is usually a value automatically calculated by an automatic programming device. However, in the initial stage of program execution, the operator often overrides and performs machining carefully, and the symbol M3 is generally displayed. The operator looks at this display and works to reset the standard machining time EMT to a longer value. In this case, if the combination of the standard machining time EMT and the total machining time (average machining time) is grouped and a symbol is displayed, the operator can easily understand that the standard machining time EMT must be set longer, and can quickly set the standard machining time EMT. In "PART-A" and "PART-D", the symbol M1 is displayed initially, and it is clear that the standard machining time EMT must be set longer. In "PART-C", when the symbol M2 is displayed, it is clear that the standard machining time EMT must be set shorter.

[0043] When the symbol M1 is displayed in "PART-A," "PART-B," "PART-C," and "PART-D," the operator understands that machining is progressing as planned, and can accurately estimate the machining end time of each workpiece W. In this way, workpieces W that have been machined under the same standard machining time EMT over a continuous period are grouped, and the standard machining time EMT at that time is compared with the total machining time (average machining time), and the difference is displayed with the symbols M1, M2, and M3, allowing the operator to clearly grasp the machining progress at a glance, which contributes to improving productivity.

[0044] Furthermore, according to the machining performance analysis device 100 of this embodiment, as shown in Fig. 10, it is possible to grasp the individual machining performance (total machining time) of the same type of workpiece W. As shown in the lower part of Fig. 10, the total machining time for each workpiece W (in the figure, "Actual 1" and "Actual 2") can be displayed, and it is possible to compare it with the average machining time (in the figure, "Average") and the standard machining time EMT (in the figure, "Expected"). This allows a workpiece W with a large fluctuation in machining time to be identified, and the operator can easily analyze the cause of the delay or advancement of machining.

[0045] As described above, the machining performance analysis device 100 and the machining performance display method according to this embodiment display a list of the machining time results for each machining process or for each tool TL1, TL2, TL3 of the machining process, and the standard machining time EMT, so that the operator can easily analyze the causes of delays or advances in machining.

[0046] Although the embodiment of the processing performance analysis device 100 and the processing performance display method have been described above, the present invention is not limited to the above embodiment. In addition to the above, it is considered that a person skilled in the art can understand that various modifications of the above embodiment are possible. [Explanation of symbols]

[0047] 26A Machining center (machine tool) 26B Machining center (machine tool) 100 Processing performance analysis device (processing performance display device) 102 Machining program execution information display unit (display unit, execution information display unit) 110 Production system control device 112 Machining program execution time information acquisition unit (measurement recording unit) 114 Machining program execution information recording unit (measurement recording unit) M1 First symbol M2 Second symbol M3 Third symbol TL tools TL1 Tools TL2 tools TL3 tools TM1 Machining time TM2 machining time TM3 machining time

Claims

1. A method for displaying machining performance of a machine tool, in which one or more machine tools are used, and each of the machine tools completes machining of a workpiece through one or more machining steps in which a plurality of tools are sequentially replaced to perform machining, comprising the steps of: In each of the machining steps, the machining time for each of the tools is measured and recorded; displaying the recorded machining time in a time series on a graph that can be identified for each tool in at least one of the machining steps of at least one of the machine tools; Display the preset standard processing time on the same time axis as the graph. A method for displaying machining results of a machine tool, comprising:

2. 2. The method for displaying machining performance of a machine tool according to claim 1, further comprising the step of displaying, alongside the graph in which the recorded machining time is cumulatively displayed in chronological order in a manner identifiable for each tool, in at least one of the machining processes of at least one of the machine tools, another graph in which the machining time in the machining processes having a different start time is cumulatively displayed in chronological order in a manner identifiable for each tool.

3. 2. The method for displaying machining performance of a machine tool according to claim 1, further comprising the step of displaying another graph showing, in a cumulative manner over time, whether or not there has been a change in feed rate override, in parallel with the graph showing, in a time series, the recorded machining time accumulatively displayed in a manner distinguishable for each tool, in at least one of the machining processes of at least one of the machine tools.

4. For each of the workpieces that have been processed, the recorded processing time for each of the tools is accumulated to calculate a total processing time; a first group whose total machining time was within a preset standard machining time range, a second group whose total machining time was shorter than the preset standard machining time range, and a third group whose total machining time was longer than the preset standard machining time range, 2. The method for displaying machining performance of a machine tool according to claim 1, further comprising displaying a first symbol, a second symbol and a third symbol representing the classified first group, the second group and the third group, respectively, in correspondence with a work classification number of the work.

5. A method for displaying machining performance of a machine tool, in which one or more machine tools are used, and each of the machine tools completes machining of a workpiece through one or more machining steps in which a plurality of tools are sequentially replaced to perform machining, comprising the steps of: In each of the machining steps, the cutting time and the non-cutting time of the machining time for each of the tools are measured and recorded separately; In at least one of the machining processes of at least one of the machine tools, the recorded cutting time and non-cutting time are cumulatively displayed in chronological order on a graph that can be identified for each tool, and graphs decomposed into a cumulative time of only the cutting time and a cumulative time of only the non-cutting time are displayed side by side, Display the preset standard processing time on the same time axis as the graph. A method for displaying machining results of a machine tool, comprising:

6. A machine tool machining performance display device that uses one or more machine tools, and completes machining of a workpiece through one or more machining steps in which each of the machine tools sequentially replaces a plurality of tools, comprising: A measurement and recording unit that measures and records a processing time for each tool in each of the processing steps; a display unit that displays, in at least one of the machining steps of at least one of the machine tools, the recorded machining time in a cumulative manner in a time series on a graph that can be identified for each of the tools, and that displays a preset standard machining time on the same time axis as that of the graph; A machining performance display device for a machine tool equipped with the same.

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