JP2024025504A - Cutting system and cutting method - Google Patents

Abstract

To provide a cutting system and a cutting method capable of accurately evaluating a plurality of workpieces or cutting tools.SOLUTION: A cutting system 1 includes: an acquisition unit 23a that acquires a cutting load applied to a cutting tool 12 in cutting processing of each workpiece W; an accumulation unit 23b that acquires an accumulated value of the cutting load; and an evaluation unit 23c that evaluates the cutting tool 12 on the basis of the accumulated value.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to cutting systems and cutting methods.

Patent Document 1 describes a method of calculating the remaining life time by setting a life time for a tool of a machine tool and subtracting the usage time of the tool from the life time.

JP2008-047021A

However, since the degree of tool wear varies depending on the type (material and shape) of the workpiece, it is not possible to accurately evaluate the tool life based only on the usage time of the tool.

The present disclosure aims to provide a cutting system and a cutting method that can accurately evaluate multiple workpieces or cutting tools.

A cutting system according to one aspect of the present disclosure is a cutting system applied to a machine tool, and includes an acquisition section, an accumulation section, and an evaluation section. A machine tool includes a cutting tool for machining a workpiece, and a rotating shaft for rotating the workpiece or the cutting tool. In the machine tool, the cutting tool cuts the workpiece as the rotating shaft rotates. The acquisition unit acquires a cutting load applied to a cutting tool during cutting of each of the plurality of workpieces. The accumulation unit obtains the cumulative value of the cutting load. The evaluation unit evaluates a plurality of workpieces or cutting tools based on the cumulative value.

According to the present disclosure, it is possible to provide a cutting system and a cutting method that can accurately evaluate a plurality of workpieces or cutting tools.

Schematic diagram showing the configuration of a cutting system according to the first embodiment Block diagram showing the configuration of the analysis unit according to the first embodiment Graph showing an example of a torque diagram Flowchart for explaining the cutting method according to the first embodiment Block diagram showing the configuration of the analysis unit according to the second embodiment Flowchart for explaining the cutting method according to the second embodiment Block diagram showing the configuration of an analysis unit according to the third embodiment Flowchart for explaining the cutting method according to the third embodiment Schematic diagram showing the configuration of a cutting system according to modification 1

<First embodiment>

(cutting system)
FIG. 1 is a schematic diagram showing the configuration of a cutting system 1 according to the first embodiment. The cutting system 1 includes three machine tools 10a to 10c and a management device 20.

(Machine Tools)
In this embodiment, the cutting system 1 includes three machine tools 10a to 10c, but the number of machine tools that the cutting system 1 includes may be one or more.

Examples of the machine tools 10a to 10c include, but are not limited to, a drilling machine, a lathe, a milling machine, a boring machine, a machining center, and a grinding machine. In this embodiment, the machine tools 10a to 10c are of the same type, but may be of different types.

As shown in FIG. 1, each machine tool 10a to 10c includes a table 11, a cutting tool 12, a rotating shaft 13, a motor 14, an amplifier 15, and a controller 16.

An unprocessed workpiece W (workpiece) is placed on the table 11 . When the cutting of the workpiece W is completed, the processed workpiece W is carried out and a new workpiece W is placed on the table 11.

The cutting tool 12 is used for cutting the work W. In this embodiment, the same type of cutting tool 12 is used in the machine tools 10a to 10c. However, the manufacturers of the cutting tools 12 are different from each other. The cutting tool 12 is attached to the rotating shaft 13 and rotates about the axis AX of the rotating shaft 13. In this embodiment, the cutting tool 12 attached to the rotating shaft 13 rotates, so that the cutting tool 12 rotates relative to the workpiece W. However, the cutting tool 12 only needs to be able to rotate relative to the workpiece W, and when the workpiece W attached to a rotating shaft (not shown) rotates, the cutting tool 12 rotates relative to the workpiece W. Good too.

The cutting tool 12 moves relative to the workpiece W. In this embodiment, the cutting tool 12 moves relative to the workpiece W by moving the table 11, but the cutting tool 12 may move relative to the workpiece W by moving the rotary shaft 13.

A cutting tool 12 is attached to the rotating shaft 13. The rotating shaft 13 is rotatable around the axis AX. The motor 14 rotates the rotating shaft 13. The motor 14 is rotated by a drive current supplied from an amplifier 15. Motor 14 transmits the motor rotation speed to controller 16 .

The amplifier 15 is connected to a power source (not shown). Amplifier 15 receives a command current from controller 16 . The amplifier 15 supplies a drive current to the motor 14 based on the received command current.

Controller 16 controls motor 14 . Specifically, the controller 16 outputs a command current to the amplifier 15 according to an NC (Numerical Control) program. Controller 16 receives the motor rotation speed from motor 14 .

The controller 16 calculates the load meter value of the motor 14 based on the command current output to the amplifier 15. The load meter value is the ratio of the command current to the rated current of the motor 14.

The controller 16 samples the load meter value and motor rotation speed during the cutting process of the workpiece W at predetermined time intervals (for example, every 10 milliseconds). Each time the controller 16 performs sampling, it generates operation data including a load meter value, motor rotation speed, tool ID, and the date and time of generation of the operation data. The tool ID is an identifier unique to the cutting tool 12, and the tool IDs of the cutting tools 12 of the machine tools 10a to 10c are different from each other. However, if the cutting system 1 includes only one machine tool and only one type of cutting tool 12 is used in the machine tool, the operation data does not need to include the tool ID.

The controller 16 can communicate with the management device 20 via a network (eg, the Internet). The controller 16 transmits the generated operation data to the management device 20. Although the timing at which the controller 16 transmits the operation data is not particularly limited, for example, when cutting of one workpiece W is completed, a plurality of pieces of operation data can be transmitted at once.

(Management device)
The functions of the management device 20 can be achieved by, for example, a server, a personal computer, or a portable terminal. When the functions of the management device 20 are achieved by a server, the server may be a cloud server. When the functions of the management device 20 are achieved by a personal computer, the personal computer may be formed integrally with each machine tool 10a to 10c, may be placed near each machine tool 10a to 10c, or may be located near each machine tool 10a to 10c. The machine tools 10a to 10c may be located in a different management room or the like from where the machine tools 10a to 10c are located. When the functions of the management device 20 are achieved by a portable terminal, a portable terminal such as a tablet can be used as the portable terminal.

As shown in FIG. 1, the management device 20 includes an operation data receiving section 21, a storage section 22, and an analysis section 23.

[Operation data receiving section]
The operation data receiving section 21 can communicate with the controller 16 of each machine tool 10a to 10c via the network. The operation data receiving section 21 receives operation data from the controller 16 of each machine tool 10a to 10c. The motion data receiving section 21 causes the storage section 22 to store the received motion data.

[Storage]
The storage unit 22 stores a plurality of pieces of motion data. Specifically, the storage unit 22 stores a load meter value and a motor rotation speed in association with each other for each tool ID included in the operation data. It is preferable that the storage unit 22 stores a plurality of pieces of operation data in order of generation date and time.

[Analysis Department]
The analysis unit 23 analyzes the plurality of motion data stored in the storage unit 22. FIG. 2 is a block diagram showing the configuration of the analysis section 23. As shown in FIG. As shown in FIG. 2, the analysis section 23 includes an acquisition section 23a, an accumulation section 23b, and a life evaluation section 23c.

- Acquisition unit 23a
The acquisition unit 23a acquires the cutting load applied to the cutting tool 12 based on the operation data. The acquisition unit 23a includes a torque calculation unit a1 and a load calculation unit a2, as shown in FIG.

The torque calculation unit a1 obtains the torque value of the motor 14 as follows based on the load meter value and the motor rotation speed included in the operation data stored in the storage unit 22.

The torque calculation unit a1 stores a torque diagram in which the relationship between the motor rotation speed and the torque value is determined. FIG. 3 is a graph showing an example of a torque diagram. In Figure 3, a polygonal line is drawn on a graph where the horizontal axis is the motor rotation speed and the vertical axis is the torque value, showing the relationship between the motor rotation speed and the maximum torque value when the load meter value is 100%. There is. The torque calculation unit a1 refers to the torque diagram and obtains the maximum torque value corresponding to the motor rotation speed included in the operation data. The torque calculation unit a1 calculates the torque value of the motor 14 by multiplying the maximum torque value by the load meter value included in the operation data.

The load calculation unit a2 calculates the cutting load applied to the cutting tool 12 by dividing the torque value calculated by the torque calculation unit a1 by the tool diameter of the cutting tool 12. The tool diameter is the dimension of the cutting edge of the cutting tool 12 in the direction perpendicular to the axis AX of the rotating shaft 13.

The load calculation unit a2 stores each operation data stored in the storage unit 22 and the calculated cutting load in association with each other.

- Accumulation section 23b
The accumulator 23b acquires the cutting load stored in association with all the operation data related to the desired tool ID from among the plurality of operation data stored in the storage section 22. Then, the accumulator 23b acquires the cumulative value of the cutting loads by accumulating all the cutting loads. The accumulator 23b acquires the cumulative value of cutting load for each tool ID.

As a method for accumulating the cutting load, there is a method of integrating the cutting load based on the machining time, or a method of integrating the cutting load based on the rotation distance of the cutting edge of the cutting tool 12 (the amount of movement of the cutting edge around the axis AX). Examples include, but are not limited to, methods.

・Life evaluation section 23c
The life evaluation section 23c is an example of an "evaluation section" according to the present disclosure. The life evaluation unit 23c stores the limit cumulative value of the cutting tool 12 indicated by a specific tool ID. The limit cumulative value can be obtained in advance by measuring the cumulative value of the cutting load when the new cutting tool 12 is worn to the limit by cutting.

The life evaluation section 23c evaluates the life of the cutting tool 12 by comparing the cumulative value of the cutting load acquired by the accumulation section 23b with the limit cumulative value. For example, it can be seen that the closer the value obtained by dividing the cumulative value of the cutting load by the limit cumulative value approaches 1, the shorter the remaining life of the cutting tool 12 is.

Here, Table 1 shows three different types of cutting tool No. It shows the relationship among the wear width, the cumulative value of cutting load, the number of machining operations, and the machining time when cutting operations were actually performed using Nos. 1 to 3. Note that the cutting process was performed on workpieces made of the same material and having the same shape (specifically, the same amount of processing) under the same cutting conditions.

As shown in Table 1, the wear width has a strong correlation with the cumulative value of the cutting load, so the cumulative value of the cutting load is suitable as an index indicating the amount of wear on the cutting tool. Therefore, as described above, it can be understood that the life of the cutting tool 12 can be evaluated with high accuracy by using the cumulative value of the cutting load.

Note that in Table 1, since cutting was performed on workpieces made of the same material and having the same shape under the same cutting conditions, the wear width has a strong correlation with the machining time. The cumulative value of cutting load has the same degree of correlation with machining time in relation to wear width. As described later, when the material of the workpiece, the amount of machining, and the cutting conditions change, the correlation between the wear width and the machining time decreases, but the correlation between the wear width and the cumulative value of the cutting load does not easily decrease.

(Cutting method)
A cutting method in the cutting system 1 will be explained with reference to the drawings. FIG. 4 is a flowchart for explaining the cutting method according to the first embodiment. Since the analysis of the cutting load applied to the cutting tool 12 is common to the three machine tools 10a to 10c, the analysis of the cutting load applied to the cutting tool 12 of one machine tool will be explained below.

In step S1, the controller 16 samples the load meter value and motor rotation speed during the cutting process of the workpiece W using the cutting tool 12.

In step S2, the controller 16 generates operation data including the load meter value, motor rotation speed, tool ID, and generation date and time.

In step S3, the operation data receiving section 21 causes the storage section 22 to store the plurality of operation data received from the controller 16.

In step S4, the acquisition unit 23a acquires the cutting load applied to the cutting tool 12 during cutting of each of the plurality of workpieces W, based on the plurality of operation data.

In step S5, the accumulation unit 23b acquires the cumulative value of the cutting load applied to the cutting tool 12.

In step S6, the life evaluation unit 23c evaluates the life of the cutting tool 12 by comparing the cumulative value of the cutting load with the limit cumulative value.

(Features)

(1) The cutting system 1 according to the present embodiment includes an accumulation section 23b and a life evaluation section 23c. The accumulator 23b acquires the cumulative value of the cutting load applied to the cutting tool 12 during cutting of each of the plurality of workpieces W. The life evaluation unit 23c evaluates the cutting tool 12 based on the cumulative value of the cutting load. Specifically, the life evaluation unit 23c evaluates the life of the cutting tool 12 based on the cumulative value of the cutting load.

In the cutting system 1 according to the present embodiment, the life of the cutting tool 12 is evaluated based on the cumulative value of the cutting load. The lifespan of the cutting tool 12 can be evaluated in consideration of the difference. Therefore, when cutting workpieces W of the same type, differences in cutting conditions are taken into consideration, so the life of the cutting tool 12 can be evaluated with high accuracy. Further, even when cutting workpieces W of different types, the lifespan of the cutting tool 12 can be evaluated with high accuracy because the differences in the material and shape of the workpieces W are taken into consideration. Furthermore, by being able to accurately evaluate the lifespan of the cutting tool 12, the cutting tool 12 can be used until its lifespan limit. Therefore, the cutting tool 12 can be used efficiently, and the productivity of the cutting system 1 can be improved. For example, cutting conditions may be changed according to the production plan, such as increasing cutting speed when increasing production and decreasing cutting speed when decreasing production, but the difference in cutting conditions is reflected in the cumulative value of cutting load. Even if it is necessary to change the cutting conditions, the life of the cutting tool 12 can be accurately evaluated.

On the other hand, when evaluating the life of the cutting tool 12 based on the number of workpieces cut, differences in workpiece material, workpiece shape (specifically, the amount of machining), and cutting conditions cannot be taken into account. The accuracy of evaluating the lifespan of No. 12 becomes low. Specifically, when cutting workpieces of different types, differences in the material and shape of the workpieces cannot be considered, so even if the number of workpieces cut is the same, the harder the workpiece is, the greater the amount of workpiece machining. As the cutting load increases, the accuracy of evaluating the life of the cutting tool 12 becomes lower. Furthermore, when cutting workpieces of the same type, differences in cutting conditions cannot be taken into account, so the faster the cutting speed, the greater the cutting load, which lowers the accuracy of evaluating the life of the cutting tool 12. .

In addition, when evaluating the life of the cutting tool 12 based on the cutting time, it is possible to take into account the difference in the amount of processing due to the different shapes of the workpieces. This is preferable compared to the case where evaluation is based on However, even in this case, differences in workpiece materials and cutting conditions cannot be taken into account, so the accuracy of evaluating the life of the cutting tool 12 will be low, as in the case of evaluation based on the number of workpieces. .

(2) The cutting system 1 according to the present embodiment includes an acquisition unit 23a that acquires a cutting load. The acquisition unit 23a includes a torque calculation unit a1 and a load calculation unit a2. The torque calculation unit a1 obtains the torque value of the motor 14 based on the load meter value of the motor 14 and the motor rotation speed of the motor 14. The load calculation unit a2 calculates the cutting load based on the torque value acquired by the torque calculation unit a1.

Therefore, there is no need to provide a sensor to detect the cutting load or torque value, and the cutting load can be easily determined from the load meter value without going through complicated analysis.

On the other hand, the conventional method of acquiring cutting load and torque by installing a sensor for detecting cutting load and torque is known, but not only is it necessary to secure a place to install the sensor, but the sensor itself is is expensive.

In addition, conventionally, a method of calculating the cutting load from the measured current value of the motor is known, but since the measured current value periodically becomes 0 (zero) during the cutting process, the cutting load is calculated. This requires analysis (conversion and extraction) and is complicated. Furthermore, since the characteristics of the waveform indicating the measured current value differ depending on the type of motor, the conversion and extraction method must be selected accordingly, and when multiple types of machine tools are used, even more complicated analysis is required. is necessary.

<Second embodiment>
The cutting system according to the second embodiment has the same configuration as the cutting system 1 according to the first embodiment shown in FIG. However, in this embodiment, the operation data further includes a work ID and a previous process ID in addition to the load meter value, motor rotation speed, tool ID, and creation date and time. The work ID includes at least one of an identifier unique to the work W and an identifier unique to each production lot of the work W. The work ID may include information that identifies the manufacturing lot. The previous process ID is an identifier unique to the previous process that the work W to be cut has undergone. Examples of the pre-process include, but are not limited to, a casting process, a forging process, a machining process, and the like.

FIG. 5 is a block diagram showing the configuration of the analysis section 23 according to the second embodiment.

The analysis section 23 includes an acquisition section 23a, an accumulation section 23d, and a pre-process evaluation section 23e.

- Acquisition unit 23a
The acquisition unit 23a includes a torque calculation unit a1 and a load calculation unit a2. The functions and configurations of the torque calculation section a1 and the load calculation section a2 are as explained in the first embodiment.

・Accumulation part 23d
The accumulator 23d acquires the cumulative value of the cutting load for each workpiece W by accumulating the cutting load for each workpiece ID that each workpiece W has as a unique identifier.

Although the method of accumulating the cutting load for each workpiece ID is not particularly limited, the accumulator 23d may accumulate the cutting load for each workpiece ID as follows. For example, when the work ID includes an identifier unique to the work W, the accumulation unit 23d may accumulate the cutting load for each work ID by recognizing the work ID. Further, the accumulator 23d accumulates the cutting loads in the order of the operation data (in the order of generation date and time), and separates the accumulation at the timing when a machining completion notification or tool exchange notification is received from the controller 16 of each machine tool 10a to 10c. The cutting load may be accumulated for each workpiece ID. The machining completion notification is a notification indicating that cutting of the workpiece W has been completed. The tool exchange notification is a notification indicating that the cutting tool 12 has been exchanged. Further, the accumulator 23d may accumulate the cutting loads for each workpiece ID by accumulating the cutting loads in the order of the operation data and dividing the accumulation according to the terminal operation by the operator.

Furthermore, the accumulation unit 23d classifies the cumulative values of cutting loads for all the workpieces W into groups of workpieces that have undergone the same pre-process, based on the pre-process ID.

・Pre-process evaluation section 23e
The pre-process evaluation section 23e is an example of an "evaluation section" according to the present disclosure. The pre-process evaluation unit 23e evaluates the accuracy of the pre-process that the work W included in each workpiece group has undergone, based on the cumulative value of the cutting load of each work W included in the group.

Here, as mentioned above, the pre-process includes a casting process, a forging process, a machining process, etc., and the target surface of the cutting process is the surface that is the same as the cast surface, or the surface that is as-forged. or a machined surface. In the cutting process, when cutting the workpiece W to a desired dimension, the cumulative value of the cutting load increases if the amount of cutting process is large. In other words, if the machining accuracy or dimensional accuracy of the previous process is poor and the deviation from the target finished dimension in cutting is large, the cumulative cutting load will be large.

Therefore, when the machining accuracy under normal conditions is high and the cumulative value of the cutting load on the workpiece W is large compared to the cumulative value of the cutting loads under normal conditions, the pre-process evaluation unit 23e responds to the group. Since the dimensional accuracy and machining accuracy of the workpiece W in the pre-process indicated by the attached pre-process ID are low, it may be assumed that a large cutting allowance was left. Further, the pre-process evaluation unit 23e determines that when the cumulative value of the cutting load on the workpiece W is small, the dimensional accuracy and machining accuracy of the workpiece W in the pre-process indicated by the pre-process ID associated with the group are low. , it may be assumed that the cutting allowance was excessively reduced.

As the cumulative value of the cutting load during normal operation, the average value or the median value of the cumulative value of the cutting load of the workpiece W in cutting operations performed in the past may be used. Alternatively, the average value or median value of the cumulative value of the cutting load of the workpiece W acquired within a predetermined period in each workpiece group may be used as the cumulative value of the cutting load during normal operation. Judgment as to whether or not the cumulative value of the cutting load on the workpiece W is larger (or smaller) than the cumulative value of the cutting load during normal operation is based on the cumulative value of the cutting load on the workpiece W and the cumulative value of the cutting load during normal operation. The determination may be made based on whether the absolute difference from the normal cutting load exceeds a threshold value obtained by multiplying the cumulative cutting load value by a predetermined ratio.

In addition, if there is a workpiece group in which the standard deviation of the cumulative value of the cutting load of the workpiece W is large, the preprocess evaluation unit 23e evaluates the workpieces in the preprocess indicated by the preprocess ID associated with the group. It may be determined that there are variations in the dimensional accuracy and processing accuracy of W.

Note that the dimensional accuracy refers to the dimensional accuracy of the workpiece W formed in a process that does not involve processing (for example, machining), such as a casting process or a forging process. The processing accuracy refers to the processing accuracy of the workpiece W formed in a processing (for example, machining) process.

Furthermore, if the cumulative value of the cutting load on the work W is small, the pre-process evaluation unit 23e determines that the work W has defects (for example, insufficient hardness or internal defects caused by insufficient heat treatment) due to defects in the pre-process. etc.).

(Cutting method)
The cutting method will be explained with reference to the drawings. FIG. 6 is a flowchart for explaining the cutting method according to the second embodiment.

Steps S1 to S3 are the same as in the first embodiment, so a description thereof will be omitted.

In step S11, the accumulation unit 23d classifies the motion data of all the workpieces W into groups of workpieces that have undergone the same pre-process, based on the pre-process ID.

In step S12, the accumulation unit 23d classifies the motion data for each workpiece W included in each workpiece group based on the workpiece ID.

In step S13, the accumulation unit 23d acquires the cumulative value of the cutting load of each workpiece W included in each workpiece group.

In step S14, the pre-process evaluation unit 23e evaluates the accuracy of the pre-process that the work W included in each workpiece group has undergone, based on the cumulative value of the cutting load of each work W included in the group.

(Features)
In the present embodiment, the accumulator 23d acquires the cumulative value of the cutting load for each workpiece W that has undergone the same pre-process among the plurality of workpieces W, and the pre-process evaluation unit 23e obtains the cumulative value of the cutting load for each workpiece W that has undergone the same pre-process. Evaluate the accuracy of the previous process based on the cumulative value for each step.

In this way, by using the cumulative value of the cutting load, it is possible to easily and accurately evaluate the dimensional accuracy, processing accuracy, defects, etc. of the previous process.

<Third embodiment>
The cutting system according to the third embodiment has the same configuration as the cutting system 1 according to the first embodiment shown in FIG.

FIG. 7 is a block diagram showing the configuration of the analysis section 23 according to the third embodiment.

The analysis section 23 includes an acquisition section 23a, an accumulation section 23f, and a tool performance evaluation section 23g.

- Acquisition unit 23a
The acquisition unit 23a includes a torque calculation unit a1 and a load calculation unit a2. The functions and configurations of the torque calculation section a1 and the load calculation section a2 are as explained in the first embodiment.

・Accumulation section 23f
The accumulation unit 23f classifies the plurality of operation data stored in the storage unit 22 for each cutting tool 12. At this time, the accumulation unit 23f may classify the plurality of motion data for each cutting tool 12 based on the tool ID included in the motion data.

The accumulation unit 23f acquires the cumulative value of the cutting load for each cutting tool 12.

・Tool performance evaluation department 23g
The tool performance evaluation section 23g is an example of an "evaluation section" according to the present disclosure. The tool performance evaluation unit 23g obtains a cumulative value for each tool by dividing the cumulative value of the cutting load for each cutting tool 12 by the number of cutting operations. The number of cutting operations is the number of workpieces W cut by each cutting tool 12. The number of works W may be acquired based on the generation date and time included in the operation data. The cumulative value by tool is the cumulative value of the cutting load applied to each cutting tool 12 during cutting of one workpiece W. The cutting load accumulation method is as described above.

The tool performance evaluation unit 23g evaluates the tool performance of each cutting tool 12 by comparing the cumulative value for each tool. For example, if the cumulative value by tool for any of the cutting tools 12 of each of the machine tools 10a to 10c is significantly small, it is determined that the cutting tool 12 manufactured by the manufacturer of the cutting tool 12 has high tool performance. You can.

(Cutting method)
The cutting method will be explained with reference to the drawings. FIG. 8 is a flowchart for explaining the cutting method according to the second embodiment.

Steps S1 to S3 are the same as in the first embodiment, so a description thereof will be omitted.

In step S21, the accumulation unit 23f acquires the cumulative value of the cutting load for each cutting tool 12.

In step S22, the tool performance evaluation unit 23g obtains a cumulative value for each tool by dividing the cumulative value of the cutting load by the number of cutting operations for each cutting tool 12.

In step S23, the tool performance evaluation unit 23g evaluates the tool performance of each cutting tool 12 based on the cumulative value for each tool.

(Features)
In this embodiment, the tool performance evaluation unit 23g calculates a cumulative value for each tool by dividing the cumulative value of the cutting load for each cutting tool 12 by the number of cutting operations, and calculates a cumulative value for each tool based on the cumulative value for each tool. Evaluate tool performance.

In this way, by using the cumulative value of the cutting load, the tool performance of the cutting tool 12 can be evaluated easily and accurately.

(Modified example of embodiment)
The present invention is not limited to the embodiments described above, and various changes and modifications can be made without departing from the scope of the present invention.

[Modification 1]
The life evaluation unit 23c of the analysis unit 23 may issue an alert regarding the life of the cutting tool 12. For example, as shown in FIG. 9, when the management device 20 has the display section 24, the life evaluation section 23c causes the display section 24 to display an alert regarding the lifespan of the cutting tool 12. For example, the life evaluation unit 23c can cause the display unit 24 to display an alert indicating that the cutting tool 12 needs to be replaced when the cumulative value of the cutting load reaches a limit cumulative value. Alternatively, when the cumulative value of the cutting load reaches a predetermined threshold value smaller than the limit cumulative value, the life evaluation unit 23c issues an alert indicating that the time to replace the cutting tool 12 is approaching, or visually checks the cutting tool 12. Recommended alerts and the like may be displayed on the display unit 24. Display contents and threshold values can be set as appropriate. As the display unit 24, a well-known monitor, display, etc. can be used.

However, the method of issuing an alert by the life evaluation section 23c is not particularly limited, and various methods can be adopted, such as a method of displaying an alert on the display section 24, and a method of emitting an alarm sound indicating an alert from a speaker.

[Modification 2]
Each machine tool 10a-10c may have an automatic exchange mechanism for cutting tools 12. In this case, the life evaluation section 23c of the analysis section 23 may instruct the automatic exchange mechanism to automatically exchange the cutting tool 12 when the cumulative value of the cutting load reaches the limit cumulative value.

[Modification 3]
As the "evaluation section" according to the present disclosure, the life evaluation section 23c of the first embodiment, the pre-process evaluation section 23e of the second embodiment, and the tool performance evaluation section 23g of the third embodiment have been described. The "evaluation unit" may have two or more of these functions and configurations.

[Modification 4]
In the first to third embodiments described above, the acquisition unit 23a acquires the cutting load based on the torque value acquired based on the load meter value and the motor rotation speed, but the present invention is not limited to this. The acquisition unit according to the present disclosure may acquire the cutting load from the detection value of a sensor that directly detects the cutting load, or may acquire the cutting load based on the torque value detected by the sensor that detects the torque value of the motor 14. You may also obtain the load. Alternatively, the acquisition unit according to the present disclosure may acquire the cutting load based on the torque value acquired based on the actually measured current value of the motor 14 and the motor rotation speed.

(Additional note 1)
It has a cutting tool for processing a workpiece, and a rotating shaft for rotating the workpiece or the cutting tool, and the cutting tool cuts the workpiece as the rotating shaft rotates. A cutting system applied to a machine tool for processing, comprising: an acquisition unit that acquires a cutting load applied to the cutting tool during cutting of each of the plurality of workpieces; and an accumulation unit that acquires a cumulative value of the cutting load. and an evaluation unit that evaluates the plurality of workpieces or the cutting tool based on the cumulative value.

(Additional note 2)
The cutting system according to supplementary note 1, wherein the evaluation unit evaluates the life of the cutting tool based on the cumulative value.

(Additional note 3)
The accumulation unit acquires the cumulative value for each workpiece that has undergone the same pre-process among the plurality of workpieces, and the evaluation unit acquires the cumulative value for each workpiece that has undergone the pre-process. The cutting system according to Supplementary Note 1 or 2, wherein the accuracy of the pre-process is evaluated based on the accuracy.

(Additional note 4)
Supplementary Notes 1 to 3, wherein the evaluation unit evaluates the tool performance of each of the plurality of cutting tools based on the cumulative value for each tool obtained by dividing the cumulative value for each of the plurality of cutting tools by the number of cutting operations. The cutting system described in any of the above.

(Appendix 5)
The acquisition unit includes a torque calculation unit that acquires a torque value of the motor based on a load meter value of a motor that rotationally drives the rotation axis of the cutting tool or the workpiece, and a motor rotation speed of the motor. , and a load calculation unit that calculates the cutting load based on the torque value.

(Appendix 6)
It has a cutting tool for processing a workpiece, and a rotating shaft for rotating the workpiece or the cutting tool, and the cutting tool cuts the workpiece as the rotating shaft rotates. A cutting method applied to a machine tool for processing, comprising: obtaining a cutting load applied to the cutting tool during cutting of each of the plurality of workpieces; and obtaining a cumulative value of the cutting load; A cutting method comprising: evaluating the plurality of workpieces or the cutting tool based on the cumulative value.

DESCRIPTION OF SYMBOLS 1... Cutting system, 10a-10c... Machine tool, 11... Table 11, 12... Cutting tool, 13... Rotating axis, 14... Motor, 15... Amplifier, 16... Controller, 20... Management device, 21... Operation data receiving part , 22... Storage section, 23... Analysis section, 23a... Acquisition section, 23b, 23d, 23f... Accumulation section, 23c... Life evaluation section, 23e... Pre-process evaluation section, 23g... Tool performance evaluation section

Claims (6)

It has a cutting tool for processing a workpiece, and a rotating shaft for rotating the workpiece or the cutting tool, and the cutting tool cuts the workpiece as the rotating shaft rotates. A cutting system applied to a machine tool for processing,
an acquisition unit that acquires a cutting load applied to the cutting tool during cutting of each of the plurality of workpieces;
an accumulation unit that obtains the cumulative value of the cutting load;
an evaluation unit that evaluates the plurality of workpieces or the cutting tool based on the cumulative value;
A cutting system equipped with
The evaluation unit evaluates the life of the cutting tool based on the cumulative value.
The cutting system according to claim 1.
The accumulation unit acquires the cumulative value for each workpiece that has undergone the same pre-process among the plurality of workpieces,
The evaluation unit evaluates the accuracy of the pre-process based on the cumulative value for each workpiece that has undergone the pre-process.
The cutting system according to claim 1 or 2.
The evaluation unit evaluates the tool performance of each of the plurality of cutting tools based on a tool-by-tool cumulative value obtained by dividing the cumulative value of each of the plurality of cutting tools by the number of cutting operations.
The cutting system according to claim 1 or 2.
The acquisition unit includes:
a torque calculation unit that obtains a torque value of the motor based on a load meter value of a motor that rotationally drives the rotation axis of the cutting tool or the workpiece, and a motor rotation speed of the motor;
a load calculation unit that calculates the cutting load based on the torque value;
has,
The cutting system according to claim 1 or 2.
It has a cutting tool for processing a workpiece, and a rotating shaft for rotating the workpiece or the cutting tool, and the cutting tool cuts the workpiece as the rotating shaft rotates. A cutting method applied to a machine tool for processing,
obtaining a cutting load applied to the cutting tool during cutting of each of the plurality of workpieces;
obtaining the cumulative value of the cutting load;
evaluating the plurality of workpieces or the cutting tool based on the cumulative value;
A cutting method comprising:

Images