Management apparatus, control method for management apparatus and program used for same, and cutting system

Abstract

This management apparatus manages the state of a milling tool. The management apparatus comprises a communication device, a processing device, and a display device. The communication device receives sensor information from a sensor mounted on the milling tool. The processing device calculates cutting resistance of the milling tool during milling, from the sensor information received by the communication device. The display device displays the calculated cutting resistance. During the milling processing, the processing device causes the display device to display time-series data of a first component of the cutting resistance during processing. The first component is a component of the cutting resistance in the rotation axis direction of the milling tool.

Description

Management device, control method of management device, program used therefor, and cutting system

[0001] The present disclosure relates to a management device, a control method of the management device, a program used therefor, and a cutting system.

[0002] Japanese Patent Application Laid-Open No. 2018-54611 (Patent Document 1) discloses a vibration measuring device for a rotary tool held by a tool holder.

[0003] Japanese Patent Application Laid-Open No. 2018-54611

[0004] The management device according to the present disclosure relates to a management device that manages the state of a turning tool. The management device includes a communication device, a processing device, and a display device. The communication device receives sensor information from a sensor mounted on the turning tool. The processing device calculates the cutting resistance of the turning tool during turning from the sensor information received by the communication device. The display device displays the calculated cutting resistance. The processing device causes the display device to display time-series data of a first component of the cutting resistance during turning. The first component is a component in the rotational axis direction of the turning tool in the cutting resistance.

[0005] The control method of the management device according to the present disclosure relates to a control method of a management device that manages the state of a turning tool. The control method includes steps of: (a) receiving sensor information from a sensor mounted on the turning tool; (b) calculating the cutting resistance of the turning tool during turning from the sensor information; and (c) displaying time-series data of a first component of the cutting resistance during turning. The first component is a component in the rotational axis direction of the turning tool in the cutting resistance.

[0006] The program according to the present disclosure is a program for causing a processing device included in a management device that manages the state of a turning tool to execute the following method. The method includes steps of: (a) receiving sensor information from a sensor mounted on the turning tool; (b) calculating the cutting resistance of the turning tool during turning from the sensor information; and (c) displaying time-series data of a first component of the cutting resistance during turning. The first component is a component in the rotational axis direction of the turning tool in the cutting resistance.

[0007] Figure 1 shows an overview of a cutting system using a control device according to this embodiment. Figure 2 shows a milling tool with a shaft attached to a tool holder. Figure 3 shows the arrangement of sensors when the milling tool is viewed from the positive Z-axis direction. Figure 4 is a first example of a screen displayed on the control device's display device. Figure 5 is a second example of a screen displayed on the control device's display device. Figure 6 is a flowchart for explaining the milling tool status display process performed by the control device. Figure 7 shows a modified example of a milling tool.

[0008] [Problems this disclosure aims to solve] The purpose of this disclosure is to provide a control device and cutting system that can observe the state of a milling tool in real time based on information from a sensor attached to the milling tool.

[0009] [Effects of this disclosure] According to this disclosure, it is possible to provide a control device and cutting system that can observe the state of a milling tool in real time based on information from a sensor attached to the milling tool.

[0010] [Summary of Embodiments] First, embodiments of the present disclosure will be listed and described.

[0011] (1) The management device 200 relating to this disclosure relates to a management device for managing the state of a milling tool 100. The management device 200 comprises a communication device 210, a processing device 220, and a display device 260. The communication device 210 receives sensor information from a sensor 120 mounted on the milling tool 100. The processing device 220 calculates the cutting resistance of the milling tool 100 during milling from the sensor information received by the communication device 210. The display device 260 displays the calculated cutting resistance. During milling, the processing device 220 displays time-series data of the first component of the cutting resistance during processing on the display device 260. The first component is the component of the cutting resistance in the direction of the rotation axis of the milling tool 100.

[0012] (2) In the control device 200 according to (1) above, the processing device 220 further displays time-series data of the second and third components of cutting resistance on the display device 260 during the milling process. The second and third components are components of cutting resistance corresponding to two directions that intersect each other in a plane perpendicular to the rotation axis of the milling tool 100. (3) The control device 200 according to (1) or (2) above further includes a storage device 230 for storing comparison data of cutting resistance. The processing device 220 displays data relating to the first data corresponding to the first component in the comparison data on the display device 260, superimposed on the first component.

[0013] (4) In the management device 200 described in (3) above, the processing device 220 displays the time-series data of the first data on the display device 260.

[0014] (5) In the control device 200 described in (4) above, the processing device 220 displays the first data on the display device 260 such that the processing start point in the first component coincides with the processing start point in the first data.

[0015] (6) In the control device 200 described in (5) above, the processing device 220 determines the point in time when the corresponding data exceeds a reference value as the processing start point.

[0016] (7) In the control device 200 described in (5) above, the processing device 220 determines the point in time when the amount of change in the corresponding data exceeds a threshold value as the processing start point.

[0017] (8) In the control device 200 described in any one of items (4) to (7) above, the processing device 220 acquires information on the feed rate of the milling tool during milling. If the feed rate in the comparison data is different from the feed rate during milling, the processing device 220 corrects the time axis of the first data so that the feed rate in the comparison data corresponds to the feed rate during milling.

[0018] (9) In the control device 200 relating to (3) above, the processing device 220 displays the statistical quantity of the first data on the display device 260. The statistical quantity includes at least one of the maximum value, minimum value, mean value, and standard deviation.

[0019] (10) The cutting system 50 relating to this disclosure comprises the control device 200 described in any one of items (1) to (9) above and a milling tool 100 on which a sensor 120 is mounted.

[0020] (11) The control method for the management device 200 according to the present disclosure relates to a control method for the management device 200 for managing the state of the milling tool 100. The control method includes (a) receiving sensor information from a sensor 120 mounted on the milling tool 100, (b) calculating the cutting resistance of the milling tool 100 during milling from the sensor information, and (c) displaying time-series data of the first component of the cutting resistance during milling. The first component is the component of the cutting resistance in the direction of the rotation axis of the milling tool 100.

[0021] (12) The program relating to the present disclosure is a program that causes a processing unit 220 included in a management device 200 for managing the state of the milling tool 100 to perform the following method. The above method includes (a) receiving sensor information from a sensor 120 mounted on the milling tool 100, (b) calculating the cutting resistance of the milling tool 100 during milling from the sensor information, and (c) displaying time-series data of the first component of the cutting resistance during milling. The first component is the component of the cutting resistance in the direction of the rotation axis of the milling tool 100.

[0022] [Details of Embodiments] Embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated. Furthermore, at least some of the embodiments described below may be combined in any way.

[0023] (Overview of the cutting system) Figure 1 is a diagram showing an overview of a cutting system 50 according to this embodiment. Referring to Figure 1, the cutting system 50 comprises a milling tool 100 and a control device 200. The milling tool 100 is attached to a machine tool 10 such as a machining center or milling machine and is used for cutting a workpiece 18 to be cut.

[0024] In the example shown in Figure 1, the machine tool 10 is a vertical machining center, and a milling tool 100 is attached to a spindle 14 provided on a head 12 that moves vertically (in the Z-axis direction). In Figure 1, the milling tool 100 includes a shaft portion 106 with a cutting edge formed thereon, and a tool holder 105 that holds the shaft portion 106, with the tool holder 105 being attached to the machine tool 10. Alternatively, instead of using the tool holder 105, the shaft portion 106 equipped with a cutting insert 160 (see Figure 7) may be directly attached to the machine tool 10, as shown in the modified example described later in Figure 7. The milling tool 100 rotates with the Z-axis direction as the axis of rotation by a motor (not shown) located on the spindle 14.

[0025] The workpiece 18 is placed on a table 16 provided on a bed 20. The table 16 is configured to be movable in the XY plane. By moving the table 16 and the head 12, the relative position between the milling tool 100 and the workpiece 18 is changed, and the workpiece 18 is cut by bringing the rotating milling tool 100 into contact with the workpiece 18.

[0026] In Figure 1, a three-axis vertical machining center is used as an example of the machine tool 10. However, the machine tool 10 may also be a horizontal machining center with its spindles arranged horizontally, or it may have four or more operating axes.

[0027] As will be described later in Figure 2, the milling tool 100 is equipped with multiple sensors. These sensors can detect the force applied to the milling tool 100.

[0028] The control device 200 determines and manages the state of the milling tool 100 using the detection values ​​of a sensor attached to the milling tool 100. The control device 200 includes a communication device 210, a control device CPU (Central Processing Unit) 220, a storage device 230, an input / output interface (I / F) 240, a display device 260, and an input device 270. The CPU 220 corresponds to the "processing device" in this disclosure.

[0029] The communication device 210, CPU 220, storage device 230, and input / output interface 240 are connected to a common bus 250 and are configured to exchange signals with each other. The display device 260 and input device 270 are connected to the input / output interface 240 by wire or wireless.

[0030] The communication device 210 is a wireless communication device that wirelessly acquires detection values ​​from a sensor attached to the tool holder 105. The CPU 220 executes a program stored in the storage device 230, processes the detection values ​​from the sensor acquired by the communication device 210, and displays the status of the milling tool 100 on the display device 260 or determines the status of the milling tool 100.

[0031] Furthermore, the CPU 220 is configured to communicate with the control device 22 included in the machine tool 10 via the communication device 210. The CPU 220 can obtain information from the control device 22 such as the machining conditions of the workpiece 18 (spindle rotation speed, feed rate, etc.) and the operating status of each piece of equipment.

[0032] The storage device 230 includes memory such as ROM (Read Only Memory) and RAM (Random Access Memory), as well as mass storage devices such as HDD (Hard Disk Drive) or SSD (Solid State Disk). The storage device 230 is used as a buffer during processing by the CPU 220, and is also used to store programs executed by the CPU 220, sensor detection values, and / or calculation results by the CPU 220.

[0033] The input device 270 is, for example, a pointing device such as a keyboard, mouse, trackball, or touch panel, and receives operation signals from the user. The display device 260 is typically a liquid crystal panel or an organic EL (Electroluminescence) panel, and displays the calculation results of the CPU 220 and information stored in the storage device 230 to the user.

[0034] The input / output interface 240 is an interface for connecting the display device 260 and the input device 270. Through the input / output interface 240, it receives user operation signals from the input device 270 and outputs information to the display device 260 for notification to the user.

[0035] (Purpose of this embodiment) The milling tools used in the machine tools described above may experience abnormalities such as wear or chipping of the cutting edge during use. When an abnormality occurs in the milling tool, it may become impossible to properly cut the workpiece, which can lead to a decrease in machining accuracy or damage to the workpiece or the tool itself. To address this problem, a configuration is known in which abnormal vibration of the milling tool during cutting is detected based on acceleration information detected from an acceleration sensor placed on a horizontal plane relative to the rotation axis of the milling tool, as described in Japanese Patent Application Publication No. 2018-54611 (Patent Document 1), and signs of tool breakage are detected.

[0036] In the vibration measuring device described in Patent Document 1, an acceleration sensor is positioned on a horizontal plane (i.e., the XY plane) relative to the rotation axis of the milling tool, and changes in the load applied in the X, Y, and rotational directions can be detected and displayed. On the other hand, in cases such as drilling, it is important to observe changes in the load applied in the rotational axis direction, i.e., the thrust direction. In particular, in order to prevent tool breakage, it is necessary to observe the thrust load in real time during milling.

[0037] Therefore, in this embodiment, a method for detecting and displaying thrust load in real time from data from sensors placed on a milling tool will be described.

[0038] (Details of the milling tool) Next, the details of the milling tool 100 will be explained using Figures 2 and 3. Figure 2 shows the milling tool 100 with the shaft portion 106 attached to the tool holder 105. Figure 3 shows the arrangement of each sensor when the milling tool 100 is viewed from the positive direction of the Z axis.

[0039] The tool holder 105 includes a main body 110 that is attached to the spindle 14 of the machine tool 10. One end of the main body 110 is attached to the spindle 14. A shaft portion 106 is attached to the other end of the main body 110.

[0040] The milling tool 100 is, for example, an end mill, milling cutter, drill, reamer, and tap, and cuts the workpiece 18 by the rotation of the tool itself. In Figure 2, the milling tool 100 is an end mill, with a cutting edge provided at the first end 107 of a substantially cylindrical shaft portion 106, and the second end 108 of the shaft portion 106 attached to a tool holder 105. The cutting edge may be formed on the shaft portion 106, or a removable cutting edge may be attached to the shaft portion 106. When a motor (not shown) provided on the spindle 14 is driven, the milling tool 100 rotates clockwise (CW) around the rotation axis CL when viewed from the positive direction of the Z axis, and the workpiece 18 is cut when the cutting edge comes into contact with the workpiece 18.

[0041] As shown in Figure 3, in the tool holder 105, a plurality of sensors 120 are attached around the shaft portion 106. In this embodiment, the plurality of sensors 120 include four strain sensors. Note that acceleration sensors may be used instead of the plurality of sensors 120.

[0042] Furthermore, a communication device 140 and a battery 150 are arranged on a circuit board (not shown) in the tool holder 105. The communication device 140 is a wireless communication device powered by the battery 150. The communication device 140 can communicate wirelessly with the communication device 210 of the management device 200 and wirelessly transmits the detection value detected by the sensor 120 to the management device 200.

[0043] The sensor 120 may be directly attached to the shaft portion 106, or it may be placed on a tool holder 105 capable of measuring the deformation state of the milling tool 100. In Figure 3, for the sake of clarity, the sensor 120 will be shown in a state where it is directly attached to the shaft portion 106.

[0044] The four sensors 120 include strain sensors 120A to 120D. The strain sensors 120A to 120D are arranged on concentric circles centered on the rotation axis CL of the shaft portion 106 within the same plane having the rotation axis CL of the shaft portion 106 as the normal. Also, the strain sensors 120A to 120D are respectively arranged on the surface of the shaft portion 106 at positions where the intervals between the central portions of the strain sensors are 90° in the circumferential direction. The strain sensor 120A and the strain sensor 120B are arranged point-symmetrically with respect to the rotation axis CL of the turning tool 100. Also, the strain sensor 120C and the strain sensor 120D are also arranged point-symmetrically with respect to the rotation axis CL of the turning tool 100.

[0045] Note that a part of the strain sensors 120A to 120D is arranged so as to have a measurement sensitivity in a direction perpendicular to the main shaft 14, and can detect loads acting in the X direction, the Y direction, and the circumferential direction. Also, another part of the strain sensors 120A to 120D is arranged so as to have a measurement sensitivity in a direction along the main shaft 14 (Z-axis direction), and can detect a load acting in the Z-axis direction.

[0046] As described above, the data detected by each sensor is transmitted to the management device 200 via the communication device 140, processed by the CPU 220, and displayed on the display device 260. In the present embodiment, data related to the loads applied in the X direction, the Y direction, and the Z direction is displayed in real time on the management device 200. Thereby, an abnormal state during turning can be determined, and problems such as tool breakage can be prevented.

[0047] (Example of Screen Display) Next, an example of the monitoring screen displayed on the display device 260 in the management device 200 of the present embodiment will be described using FIGS. 4 and 5.

[0048] Figure 4 is a first example of a display screen 300 displayed on the display device 260 of the management device 200. The display screen 300 includes areas 310, 320, and 330 as display areas. Area 310 is arranged in the upper left corner of the screen, and the cutting resistance Fx (line LN10) in the X direction and the cutting resistance Fy (line LN11) in the Y direction are displayed in time series. Area 320 is arranged in the lower left corner of the screen, and the cutting resistance Fz (line LN12) in the Z direction is displayed in time series. Area 330 is arranged on the right side of the screen, and the distribution of the cutting resistance in the XY plane is displayed. More specifically, in area 330, with the horizontal axis being the cutting resistance Fx in the X direction and the vertical axis being the cutting resistance Fy in the Y direction, the load distribution at each moment during the turning process is displayed. Note that in each display area, instead of the cutting resistance, other data such as torque data can also be displayed.

[0049] Although it is also possible to process the detection data after the turning process and display it in each area, by displaying each data in real time during the turning process, the abnormal state of the turning tool can be quickly determined, and the appropriateness of the processing conditions can be confirmed and various parameters can be adjusted immediately. Therefore, it also leads to an improvement in processing quality and a reduction in the defect rate.

[0050] Figure 5 shows a second example of the display screen 300 displayed on the display device 260 of the management device 200. In this display example, in area 310, the cutting resistance Fx (line LN20) and the cutting resistance Xy (line LN21) are displayed. In area 320, for the cutting resistance Fz in the Z direction, together with the current data during processing (line LN22), comparison data (line LN23) of other processing times acquired in the past is displayed. Also, in area 330, the distribution of the cutting resistance in the comparison data (white circles) and the distribution of the cutting resistance in the data during processing (black circles) are displayed.

[0051] Here, comparative data refers to data obtained, for example, when machining is performed using a tool in normal condition under the same machining conditions, and is pre-stored in the storage device 230 of the control device 200. By displaying such comparative data overlaid with the data being used during machining, it is possible to visually assess the performance of the tool currently in use and / or the condition of the tool's damage. Therefore, it can be used when evaluating newly developed tools, evaluating the durability of tools, and diagnosing the deterioration of tools.

[0052] Furthermore, comparative data can be used, such as data obtained when machining under different machining conditions. For example, data obtained when the tool feed rate is changed, data obtained when the tool rotation speed is changed, data obtained when the tool depth of cut is changed, or data obtained when the presence or absence of cutting fluid and the type of cutting fluid are changed can be used. By comparing the data obtained during machining with such comparative data, it becomes easier to set appropriate machining conditions for the workpiece being machined.

[0053] Furthermore, when using comparison data for different machining conditions, depending on the parameters of the target machining conditions, simply overlaying the comparison data onto the real-time data of the currently being machined may not allow for a correct evaluation. For example, if the tool feed rates are different, the total machining times will also be different. Therefore, simply overlaying the data may not lead to a correct judgment because the machining end points will differ. In such cases, the CPU 220 of the control device 200 corrects the time axis of the comparison data so that the feed rate in the comparison data corresponds to the feed rate during machining, and displays it overlaid on the data of the currently being machined. By performing this correction process, even when the machining conditions are different, the data can be correctly compared with the data of the currently being machined.

[0054] In this case, the comparison data stored in the memory device 230 may not necessarily have the same machining start point. Therefore, when the CPU 220 displays the comparison data, it performs a process to match the timing of the machining start point in the comparison data with the machining start point in the real-time data currently being machined.

[0055] Specifically, the CPU 220 determines the point at which the data value exceeds a predetermined reference value during the rise of data at the start of processing as the processing start point. The CPU then displays the comparison data on the display device 260 so that the processing start point determined by the comparison data matches the processing start point determined by the real-time data. By performing this process, the starting positions of the two sets of data coincide, making it easier to compare the data.

[0056] Furthermore, the determination of the processing start point is not limited to comparing the absolute value of the data with a reference value; for example, the processing start point may be defined as the point in time when the amount of data fluctuation (or fluctuation range) per unit time exceeds a predetermined threshold.

[0057] Furthermore, regarding the display of comparative data, time-series data similar to the real-time data being processed may be displayed, or instead, or in addition to that, statistical measures for the comparative data may be displayed. Examples of statistical measures that can be used include the maximum value, minimum value, mean, standard deviation, and variance of the comparative data.

[0058] As described above, by displaying the cutting resistance Fz in the Z direction during milling in real time, it becomes possible to quickly determine the state of the milling tool, and by displaying comparative data overlaid, it becomes easy to set machining conditions suitable for the workpiece. In this embodiment, at least one sensor may be used as long as it can measure the cutting resistance Fz in the Z direction.

[0059] It is possible to display comparative data for the cutting resistance Fx in the X direction and the cutting resistance Fy in the Y direction. However, since these horizontal loads generally tend to have larger deviations from the average value compared to the thrust load in the Z direction, the effect of superimposing the comparative data will be somewhat smaller.

[0060] (Flowchart of Display Processing) Figure 6 is a flowchart illustrating the status display processing of the milling tool 100, which is performed by the control device 200 in the cutting system 50 of this embodiment. The processing shown in Figure 6 is realized in the control device 200 by the CPU 220 executing a program read from the storage device 230.

[0061] Referring to Figure 6, the control device 200 acquires sensor data transmitted from the tool holder 105 in step 100 (hereinafter, steps are abbreviated as "S"). Then, based on the measurement data from the sensor 120, the control device 200 calculates the cutting resistances Fx, Fy, and Fz (S110) and displays the cutting resistances Fx, Fy, and Fz during machining on the display device 260 in real time (S120).

[0062] Next, in S130, the management device 200 determines whether or not the user has requested the display of comparison data. If the display of comparison data has not been requested (NO in S130), the process proceeds to S140.

[0063] If the user requests the display of comparison data (YES in S130), the process proceeds to S150, where the control device 200 selects the comparison data corresponding to the user's request from the data stored in the storage device 230. Then, if the control device 200 displays the comparison data in a time series, it performs a process to match the machining start point (start point matching process) for the selected comparison data (S160), and, if necessary, performs a process to correct the feed rate (feed rate correction process) (S170). Although not shown in Figure 6, if statistical values ​​of the comparison data are to be displayed, the control device 200 calculates the statistical values ​​to be displayed, either in place of or in addition to the processes in S160 and S170.

[0064] Subsequently, in S180, the management device 200 displays the comparison data (time-series data / statistical values) on the display device 260 and proceeds to processing in S140.

[0065] In S140, the control device 200 determines whether or not the machining of the workpiece 18 to be machined has been completed. If the machining is not completed (NO in S140), the process returns to S100, and the control device 200 continues to acquire sensor data during machining and displays the cutting resistance Fx, Fy, Fz and comparison data on the display device 260. On the other hand, if the machining is completed (YES in S140), the control device 200 terminates the process while maintaining the final display state.

[0066] By performing control according to this process, the cutting resistance during machining is displayed in real time on the display device 260 of the control device 200, along with comparison data. This makes it possible to determine the state of the milling tool during machining, and by displaying the comparison data overlaid, it is possible to easily set machining conditions suitable for the workpiece.

[0067] (Modified version of the milling tool) Figure 7 shows a modified version of the milling tool 100A. The milling tool 100A does not include a tool holder like the milling tool 100 of the embodiment, and its shaft portion is attached to the spindle of a machine tool that includes a tool holder.

[0068] Referring to Figure 7, the milling tool 100A includes a shaft portion 106A and a sensor 120 mounted around the shaft portion 106A. The sensor 120 is housed inside a housing 170 provided on the shaft portion 106A. Similar to the milling tool 100 of the embodiment, the sensor 120 is arranged at equal intervals in the circumferential direction of the shaft portion 106A. Although not shown in Figure 7, the communication device 140 and battery 150 shown in Figure 2 are also located inside the housing 170.

[0069] A replaceable cutting insert (throwaway tip) 160 is attached to the first end 107 of the shaft portion 106A. The second end 108 of the shaft portion 106A is attached to the spindle 14 of a machine tool 10 that has a tool holder.

[0070] Thus, even with milling tools that are attached to the spindle including the tool holder, by placing a sensor on the shaft of the milling tool, the status of the milling tool can be displayed in real time based on the data from the sensor.

[0071] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope of the claims are intended to be included.

[0072] 10 Machine tool, 12 Head, 14 Spindle, 16 Table, 18 Workpiece, 20 Bed, 22 Control device, 50 Cutting system, 100, 100A Milling tool, 105 Tool holder, 106, 106A Shaft section, 107 First end, 108 Second end, 110 Main body, 120 Sensor, 120A-120D Strain sensor, 140 Communication device, 150 Battery, 160 Cutting insert, 170 Housing, 200 Management device, 210 Communication device, 220 CPU, 230 Storage device, 240 Input / output interface, 250 Bus, 260 Display device, 270 Input device, 300 Display screen, 310-330 Area, CL Rotation axis, Fx, Fy, Fz Cutting resistance.

Claims

1. A management device for managing the state of a milling tool, comprising: a communication device for receiving sensor information from a sensor mounted on the milling tool; a processing device for calculating the cutting resistance of the milling tool during milling from the sensor information received by the communication device; and a display device for displaying the calculated cutting resistance, wherein the processing device displays time-series data of a first component of the cutting resistance during milling on the display device, and the first component is the component of the cutting resistance in the direction of the rotation axis of the milling tool.

2. The control device according to claim 1, wherein the processing device further displays time-series data of the second and third components of the cutting resistance on the display device during milling, and the second and third components are components of the cutting resistance corresponding to two directions that intersect each other in a plane perpendicular to the rotation axis of the milling tool.

3. The management device according to claim 1 or 2, further comprising a storage device for storing comparative data on cutting resistance, wherein the processing device displays the data relating to the first data corresponding to the first component in the comparative data and the first component superimposed on the display device.

4. The management device according to claim 3, wherein the processing device displays the time-series data of the first data on the display device.

5. The control device according to claim 4, wherein the processing apparatus displays the first data on the display device such that the processing start point in the first component coincides with the processing start point in the first data.

6. The control device according to claim 5, wherein the processing device determines the point in time when the corresponding data exceeds a reference value as the processing start point.

7. The control device according to claim 5, wherein the processing device determines the point in time when the amount of variation of the corresponding data exceeds a threshold as the processing start point.

8. The control device according to any one of claims 4 to 7, wherein the processing device acquires information on the feed rate of the milling tool, and if the feed rate in the comparison data differs from the feed rate during milling, the processing device corrects the time axis of the first data so that the feed rate in the comparison data corresponds to the feed rate during milling.

9. The control device according to claim 3, wherein the processing device displays a statistical quantity in the first data on the display device, and the statistical quantity includes at least one of the maximum value, minimum value, mean value, and standard deviation.

10. A cutting system comprising a control device according to any one of claims 1 to 9, and the milling tool on which the sensor is mounted.

11. A control method for a management device for managing the state of a milling tool, comprising the steps of: receiving sensor information from a sensor mounted on the milling tool; calculating the cutting resistance of the milling tool during milling from the sensor information; and displaying time-series data of a first component of the cutting resistance during milling, wherein the first component is the component of the cutting resistance in the direction of the rotation axis of the milling tool.

12. A program for causing a processing unit included in a management device for managing the state of a milling tool to perform the following method, wherein the method includes the steps of: receiving sensor information from a sensor mounted on the milling tool; calculating the cutting resistance of the milling tool during milling from the sensor information; and displaying time-series data of a first component of the cutting resistance during milling, wherein the first component is the component of the cutting resistance in the direction of the rotation axis of the milling tool.

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