JP6966604B1 - Machine tools, machine tool control methods, and machine tool control programs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for executing a measurement process of a tool wear amount at an appropriate timing. A machine tool includes a spindle on which a tool can be mounted, a measuring unit for measuring the amount of wear of the tool mounted on the spindle, and a control unit for controlling the machine tool. .. The control unit performs a process of acquiring transition information indicating the transition of the wear amount of the first tool according to the total usage amount of the first tool, and when a second tool of the same type as the first tool is mounted on the spindle. , The process of determining whether to execute the measurement process of the wear amount of the second tool by the measuring unit based on the transition information and the current total usage amount of the second tool, and the measurement result by the measuring unit are abnormal. When indicated, the process of executing the predetermined first abnormality handling process and the process of executing the process are executed. [Selection diagram] FIG. 4

Description

The present disclosure relates to a technique for controlling the measurement timing of the amount of wear of a tool.

As the wear of tools in machine tools progresses, various problems arise. For example, the desired machining accuracy may not be obtained or the tool may be damaged. In order to deal with these problems, techniques for measuring the amount of wear of tools have been developed. Regarding this technique, Japanese Patent Application Laid-Open No. 2017-49656 (Patent Document 1) discloses a machine tool capable of measuring the amount of wear of a tool using an image of the tool.

Japanese Unexamined Patent Publication No. 2017-49656

If the tool wear measurement process is performed frequently, the waiting time increases. On the other hand, if the tool wear amount measurement process is not executed for a long period of time, the machine tool may not be able to detect that it is time to replace the tool. Therefore, it is desired to execute the tool wear amount measurement process at an appropriate timing. The technique disclosed in Patent Document 1 is not for controlling the execution timing of the tool wear amount measurement process.

In one example of the present disclosure, the machine tool has a spindle on which a tool can be mounted, a measuring unit for measuring the amount of wear of the tool mounted on the spindle, and a control for controlling the machine tool. It has a part. The control unit has a process of acquiring transition information indicating a transition of the wear amount of the first tool according to the total usage amount of the first tool, and a second tool of the same type as the first tool is mounted on the spindle. If so, a process of determining whether or not to execute the measurement process of the wear amount of the second tool by the measuring unit based on the transition information and the current total usage amount of the second tool. When the measurement result by the measuring unit indicates an abnormality, the process of executing the predetermined first abnormality handling process and the process of executing the process are executed.

In one example of the present disclosure, the larger the total amount of the second tool used, the higher the frequency of execution of the above-determined process.

In one example of the present disclosure, the control unit further executes a process of estimating the current wear amount of the second tool based on the transition information and the current total usage amount of the second tool. The control unit determines that the measurement process by the measurement unit is not executed when the current wear amount of the second tool is equal to or less than a predetermined amount in the determination process.

In one example of the present disclosure, the wear amount of the first tool defined in the transition information is associated with an allowable range according to the total usage amount of the first tool. The control unit further acquires the total usage amount of the second tool at the execution timing of the measurement process, and acquires the permissible range associated with the acquired total usage amount based on the transition information. The process and the process of executing a predetermined second abnormality handling process when the measurement result of the wear amount of the second tool at the execution timing is not included in the acquired allowable range are executed.

In one example of the present disclosure, the permissible range defined according to the total usage amount of the first tool becomes narrower as the total usage amount of the first tool increases.

In one example of the present disclosure, the control unit further executes a process of updating the transition information based on the measurement result of the wear amount of the second tool by the measurement unit.

Another example of the present disclosure provides a method of controlling a machine tool. The machine tool includes a spindle on which a tool can be mounted and a measuring unit for measuring the amount of wear of the tool mounted on the spindle. The control method includes a step of acquiring transition information indicating a transition of the wear amount of the first tool according to the total usage amount of the first tool, and a second tool of the same type as the first tool is mounted on the spindle. If so, a step of determining whether or not to execute the measurement process of the wear amount of the second tool by the measuring unit based on the transition information and the current total usage amount of the second tool. When the measurement result by the measuring unit indicates an abnormality, a step of performing a predetermined abnormality handling process is provided.

In another example of the present disclosure, a machine tool control program is provided. The machine tool includes a spindle on which a tool can be mounted and a measuring unit for measuring the amount of wear of the tool mounted on the spindle. In the control program, the machine tool has a step of acquiring transition information indicating a transition of the wear amount of the first tool according to the total usage amount of the first tool, and a second tool of the same type as the first tool. When mounted on the spindle, whether or not to execute the measurement process of the wear amount of the second tool by the measuring unit based on the transition information and the current total usage amount of the second tool. A step of determining and a step of performing a predetermined abnormality handling process when the measurement result by the measuring unit indicates an abnormality are executed.

The above and other objects, features, aspects and advantages of the invention will become apparent from the following detailed description of the invention as understood in connection with the accompanying drawings.

It is a figure which shows the appearance of a machine tool. It is a figure which shows the structural example of the drive mechanism in a machine tool. It is a figure which shows the spindle head and the measuring part. It is a figure which shows the transition of the tool wear amount with respect to the total tool use amount. It is a figure which shows an example of the functional composition of a machine tool. It is a figure which shows an example of the data structure of transition information. It is a figure which shows an example of the data structure of the usage information. It is a figure which shows the transition information shown in FIG. 7 in a graph. It is a figure which added the permissible range to the transition information shown in FIG. 7. It is a figure which shows the updated transition information. It is a figure which shows an example of the hardware composition of the operation panel. It is a figure which shows an example of the hardware composition of a CNC (Computerized Numerical Control) unit. It is a figure which shows an example of the hardware composition of an information processing apparatus. It is a flowchart which shows a part of the processing executed by the control part of a machine tool.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the following description, the same parts and components are designated by the same reference numerals. Their names and functions are the same. Therefore, the detailed description of these will not be repeated. In addition, each embodiment and each modification described below may be selectively combined as appropriate.

<A. Configuration of machine tool 100>
First, the configuration of the machine tool 100 will be described with reference to FIG. FIG. 1 is a diagram showing the appearance of the machine tool 100.

The machine tool 100 is a work processing machine. As an example, the machine tool 100 is a machine tool that performs work removal processing (SM (Subtractive manufacturing) processing). Alternatively, the machine tool 100 may be a machine tool that performs additive processing (AM (Additive manufacturing) processing) of the work. Further, the machine tool 100 may be a vertical machining center, a horizontal machining center, or a turning center. Alternatively, the machine tool 100 may be a lathe, or another cutting machine or grinding machine. Further, the machine tool may be a multifunction device in which these are combined.

The machine tool 100 is provided with an operation panel 20. The operation panel 20 includes a display 205 for displaying various information related to machining, and an operation key 206 for receiving various operations on the machine tool 100.

The machine tool 100 has a machining area AR1 and a tool area AR2. Each of the machining area AR1 and the tool area AR2 is partitioned by a cover. The processing area AR1 is provided with a spindle head 130. The tool area AR2 is provided with an ATC 160 and a magazine 170. The magazine 170 houses various tools used for machining the work. The tool stored in the magazine 170 is attached to the spindle head 130 via the door D provided in the partition between the machining area AR1 and the tool area AR2. The door D is a sliding door and is opened and closed by a drive source such as a motor.

<B. Drive mechanism of machine tool 100>
Next, various drive mechanisms in the machine tool 100 will be described with reference to FIG. FIG. 2 is a diagram showing a configuration example of a drive mechanism in the machine tool 100.

As shown in FIG. 2, the machine tool 100 includes a control unit 50, a rotation drive unit 110A, a position drive unit 110B, a spindle head 130, and a measurement unit 140.

The “control unit 50” as used herein means a device that controls a machine tool 100. The device configuration of the control unit 50 is arbitrary. The control unit 50 may be composed of a single control unit or may be composed of a plurality of control units. In the example of FIG. 2, the control unit 50 includes an operation panel 20, a CNC unit 30, and an information processing device 40.

The operation panel 20 and the CNC unit 30 communicate with each other via, for example, a communication path NW1 (for example, a wireless LAN, a wired LAN, a field network, etc.). The CNC unit 30 and the information processing device 40 communicate with each other via, for example, a communication path NW2 (for example, a wireless LAN, a wired LAN, a field network, etc.).

The CNC unit 30 starts executing a pre-designed machining program based on receiving the machining start command. The machining program is described by, for example, an NC (Numerical Control) program. The CNC unit 30 controls the rotation drive unit 110A and the position drive unit 110B according to the machining program, and drives the spindle head 130.

The information processing device 40 is a general-purpose computer. As an example, the information processing apparatus 40 may be a desktop computer, a notebook computer, or a tablet terminal. An image processing program is installed in the information processing apparatus 40, and various image processings are executed on the images acquired from the measuring unit 140.

The spindle head 130 includes a spindle cylinder 131 and a spindle 132. The main shaft 132 is rotatably supported by the main shaft cylinder 131. One tool 134 selected from the magazine 170 (see FIG. 1) is mounted on the spindle 132. The tool 134 rotates in conjunction with the spindle 132.

The rotation drive unit 110A is a drive mechanism for changing the angle of the spindle 132. As an example, the rotation drive unit 110A has a rotation direction centered on the X-axis direction (A-axis), a rotation direction centered on the Y-axis direction (B-axis), and a rotation axis center on the Z-axis direction. Adjust at least one angle of the rotation direction (C axis). The device configuration of the rotary drive unit 110A is arbitrary. The rotary drive unit 110A may be composed of a single drive unit or may be composed of a plurality of drive units. In the example of FIG. 2, the rotation drive unit 110A is composed of servo drivers 111B and 111C.

The position drive unit 110B is a drive mechanism for changing the position of the spindle 132. As an example, the position drive unit 110B adjusts at least one position in the X-axis direction, the Y-axis direction, and the Z-axis direction. The device configuration of the position drive unit 110B is arbitrary. The position drive unit 110B may be composed of a single drive unit or may be composed of a plurality of drive units. In the example of FIG. 2, the position drive unit 110B is composed of servo drivers 111X to 111Z.

The servo driver 111B sequentially receives input of a target rotation speed from the CNC unit 30 and controls a servomotor (not shown) for rotationally driving the spindle head 130 in the B-axis direction.

More specifically, the servo driver 111B calculates the actual rotation speed of the servo motor from the feedback signal of an encoder (not shown) for detecting the rotation angle of the servo motor, and the actual rotation speed is the target rotation speed. If it is smaller than, the rotation speed of the servomotor is increased, and if the actual rotation speed is larger than the target rotation speed, the rotation speed of the servomotor is decreased. In this way, the servo driver 111B brings the rotational speed of the servomotor closer to the target rotational speed while sequentially receiving feedback of the rotational speed of the servomotor. As a result, the servo driver 111B adjusts the rotation speed of the spindle head 130 in the B-axis direction.

The servo driver 111C sequentially receives input of a target rotation speed from the CNC unit 30 and controls a servomotor (not shown) for rotationally driving the spindle 132 in the rotational direction centered on the axial direction of the spindle 132. ..

More specifically, the servo driver 111C calculates the actual rotation speed of the servo motor from the feedback signal of an encoder (not shown) for detecting the rotation angle of the servo motor, and the actual rotation speed is the target rotation speed. If it is smaller than, the rotation speed of the servomotor is increased, and if the actual rotation speed is larger than the target rotation speed, the rotation speed of the servomotor is decreased. In this way, the servo driver 111C brings the rotational speed of the servomotor closer to the target rotational speed while sequentially receiving feedback of the rotational speed of the servomotor. As a result, the servo driver 111C adjusts the rotation speed of the spindle 132 in the rotation direction centered on the axis direction of the spindle 132.

The servo driver 111X sequentially receives the input of the target position from the CNC unit 30 and controls the servo motor (not shown). The servomotor feeds and drives a moving body to which the spindle head 130 is attached via a ball screw (not shown), and moves the spindle head 130 to an arbitrary position in the X-axis direction. Since the method of controlling the servomotor by the servo driver 111X is the same as that of the servo drivers 111B and 111C, the description thereof will not be repeated.

The servo driver 111Y sequentially receives the input of the target position from the CNC unit 30 and controls the servo motor (not shown). The servomotor feeds and drives a moving body to which the spindle head 130 is attached via a ball screw (not shown), and moves the spindle 132 to an arbitrary position in the Y-axis direction. Since the method of controlling the servomotor by the servo driver 111Y is the same as that of the servo drivers 111B and 111C, the description thereof will not be repeated.

The servo driver 111Z sequentially receives input of a target position from the CNC unit 30 and controls a servo motor (not shown). The servomotor feeds and drives a moving body to which the spindle head 130 is attached via a ball screw (not shown), and moves the spindle 132 to an arbitrary position in the Z-axis direction. Since the method of controlling the servomotor by the servo driver 111Z is the same as that of the servo drivers 111B and 111C, the description thereof will not be repeated.

In the above description, an example in which the rotation drive unit 110A is composed of a servo driver has been described, but the rotation drive unit 110A may be composed of another motor driver. As an example, the rotary drive unit 110A may be composed of one or more motor drivers for a stepping motor. Similarly, the position drive unit 110B may be composed of one or more motor drivers for stepping motors.

The measuring unit 140 is a measuring mechanism for measuring the amount of wear of the tool. As an example, the measuring unit 140 functions as an imaging unit. The information processing apparatus 40 measures the amount of wear of the tool reflected in the image by performing a predetermined image process on the image obtained from the image pickup unit. The details of the method for measuring the amount of wear will be described later.

<C. Measurement mechanism>
Next, the measuring mechanism of the measuring unit 140 will be described with reference to FIG. FIG. 3 is a diagram showing a spindle head 130 and a measuring unit 140.

In the example of FIG. 3, the spindle head 130 is provided in the machining area AR1, and the measuring unit 140 and the light sources 145 and 147 are provided in the tool area AR2. The measuring unit 140 includes a camera 141 and an objective lens 142.

The light source 145 is, for example, ring illumination and is installed so as to surround the objective lens 142. The light source 145 irradiates an object in the shooting field of view CR of the camera 141 with light. The reflected light from the object is incident on the objective lens 142. As a result, a tool image showing the tool 134 is obtained from the camera 141.

The light source 147 is provided so as to face the objective lens 142 and the light source 145. The light source 147 irradiates an object in the shooting field of view CR of the camera 141 with light from the opposite side of the shooting direction. As a result, the light emitted from the light source 147 is blocked by an object included in the shooting field of view CR of the camera 141, and the light not blocked by the object is incident on the camera 141. As a result, a tool image as a shadow picture is obtained from the camera 141.

<D. Overview>
Next, with reference to FIG. 4, a method for reducing the number of times the measurement process is executed by the measurement unit 140 will be described.

The machine tool 100 periodically executes a tool wear amount measurement process using the measuring unit 140 in order to detect that it is time to replace the tool. The measurement process includes a process of driving the spindle 132 so that the tool to be measured is included in the photographing field of the measurement unit 140, a process of acquiring an image of the tool from the measurement unit 140, and tool wear based on the image. Includes processing to estimate the quantity. If the measurement process is executed frequently, the waiting time increases. On the other hand, if the tool wear amount measurement process is not executed for a long period of time, the tool replacement time may be missed.

Therefore, the machine tool 100 determines whether or not it is necessary to measure the wear amount of the current tool with reference to the past transition of the tool wear amount. Then, the machine tool 100 executes the tool wear amount measurement process only when it is determined that the wear amount measurement process is necessary. As a result, the number of times the measurement process is executed by the measuring unit 140 is reduced, and the possibility of missing the tool replacement time is reduced.

FIG. 4 is a diagram showing a transition of the tool wear amount with respect to the total tool usage amount. The total amount of tools used means the amount of tools used from the time of new product to the present. The term "quantity" here is a concept that includes time, distance, and number of times. That is, the "total tool usage amount" is a concept including the total usage time of the tool up to the present, the total movement distance of the tool up to the present, and the total number of times the tool has been used up to the present.

As a more specific process, the machine tool 100 acquires the past transition information 122 of the tool wear amount in advance. The transition information 122 defines, for example, the relationship between the total usage amount of the tool "A1" having the tool type "A" and the wear amount of the tool "A1". As shown in FIG. 4, as the total amount of tools used increases, the amount of tool wear increases.

When the transition information 122 for the tool type "A" is obtained and the tool "A2" (second tool) of the same type as the tool "A1" (first tool) is mounted on the spindle 132, the work is performed. The machine 100 determines whether or not to execute the tool wear amount measurement process based on the transition information 122 and the current total usage amount of the tool “A2”.

More specifically, the machine tool 100 specifies the tool wear amount corresponding to the current total usage amount of the tool "A2" with reference to the transition information 122, and the specified tool wear amount is used for the tool "A2". Considered as the current amount of wear. Then, the machine tool 100 determines that the tool wear amount measurement process is not executed when the current wear amount is equal to or less than the predetermined threshold value “th1”.

As an example, when the current total usage amount of the tool "A2" is "T1", the machine tool 100 considers the current wear amount of the tool "A2" to be "M1" according to the transition information 122. In this case, since the current wear amount “M1” is equal to or less than the predetermined threshold value “th1”, the machine tool 100 determines that the tool wear amount measurement process is not executed.

On the other hand, when the current total usage amount of the tool "A2" is "T2", the machine tool 100 considers the current wear amount of the tool "A2" to be "M2" according to the transition information 122. In this case, since the current wear amount “M2” exceeds the predetermined threshold value “th1”, the machine tool 100 determines that the tool wear amount measurement process is executed.

In the above description, an example in which whether or not to execute the tool wear amount measurement process is determined based on the threshold value “th1” has been described, but it is determined whether or not to execute the tool wear amount measurement process. The method is not limited to the method using the threshold value “th1”. As an example, the machine tool 100 may determine that the tool wear amount measurement process is executed with a probability according to the current tool usage amount. The probability increases as the amount of current tools used increases.

<E. Functional configuration of machine tool 100>
The functional configuration of the machine tool 100 will be described with reference to FIGS. 5 to 10. FIG. 5 is a diagram showing an example of the functional configuration of the machine tool 100.

The machine tool 100 has a transition information acquisition unit 52, a monitoring unit 54, an estimation unit 56, an execution determination unit 58, a first abnormality handling unit 60, an allowable range acquisition unit 62, and a second abnormality as functional configurations. A processing unit 64 and an update unit 66 are included. Hereinafter, these functional configurations will be described in order.

The arrangement of each functional configuration is arbitrary. As an example, all of the functional configurations shown in FIG. 3 may be mounted on the above-mentioned operation panel 20 (see FIG. 2), or may be mounted on the above-mentioned CNC unit 30 (see FIG. 2). It may be mounted on the above-mentioned information processing apparatus 40 (see FIG. 2). Alternatively, a part of the functional configuration shown in FIG. 3 may be mounted on the operation panel 20, a part of the remaining functional configuration may be mounted on the CNC unit 30, and the remaining functional configuration may be mounted on the information processing apparatus 40. .. Alternatively, a part of the functional configuration shown in FIG. 3 may be implemented in an external device such as a server, or may be implemented in dedicated hardware.

(E1. Transition information acquisition unit 52)
First, with reference to FIG. 6, the function of the transition information acquisition unit 52 shown in FIG. 3 will be described. FIG. 6 is a diagram showing an example of the data structure of the transition information 122.

The transition information acquisition unit 52 acquires the transition information 122 (see FIG. 4) described above, and stores the acquired transition information 122 in the storage device 120 of the machine tool 100. As shown in FIG. 6, the transition information 122 defines the correspondence relationship between the tool identification information, the tool usage amount, and the tool wear amount for each tool type. The tool identification information is indicated by, for example, a tool name or a tool ID (Identification).

In a certain aspect, each time the measurement process is executed by the measuring unit 140, the machine tool 100 obtains the identification information of the tool to be measured, the current total usage amount of the tool, and the measurement result of the wear amount of the tool. , Write in the transition information 122 of the corresponding tool type. As a result, the relationship between the amount of tool used and the amount of tool wear is accumulated as a history.

In another aspect, the transition information 122 is acquired from another machine tool different from the machine tool 100. As a result, the machine tool 100 can divert the measurement results of other machine tools to the machine tool 100.

In the example of the transition information 122 in FIG. 6, the relationship between the tool usage amount and the tool wear amount is shown in a table format, but the data format of the transition information 122 is not limited to this. As an example, the transition information 122 may be expressed by a calculation formula using the tool usage amount as an explanatory variable and the tool wear amount as an objective variable. More specifically, the machine tool 100 generates an approximate formula representing the correlation between the tool usage amount and the tool wear amount as the calculation formula based on a plurality of combinations of the tool usage amount and the tool wear amount. The approximation formula is generated, for example, by polynomial approximation or linear approximation.

(E2. Monitoring unit 54)
Next, with reference to FIG. 7, the function of the monitoring unit 54 shown in FIG. 3 will be described.

The monitoring unit 54 monitors the machining program 323 and counts the total amount used for each tool. The total usage of the tool is written, for example, in the usage information 124 shown in FIG. FIG. 7 is a diagram showing an example of the data structure of the usage amount information 124. As shown in FIG. 7, in the usage amount information 124, the total usage amount of the tool from the time of new product to the present is associated with the tool identification information. The total usage amount specified in the usage amount information 124 is updated by the monitoring unit 54.

More specifically, the machining program 323 is defined by, for example, a G code, and is a tool change command for designating a tool to be mounted on the spindle 132, or a drive for rotationally driving / feed driving the spindle or tool. Including instructions and so on. The monitoring unit 54 identifies the identification information of the tool used for machining the work based on the tool change command specified in the machining program 323. Next, the monitoring unit 54 starts counting the usage time of the tool based on the execution of the drive command specified in the machining program 323. Subsequently, the monitoring unit 54 stops counting the usage time of the tool based on the execution of the stop command specified in the machining program 323 or the command on the last line. After that, the monitoring unit 54 adds the counted usage time to the total usage amount associated with the tool used with reference to the tool usage history 126. As a result, the total usage time of each tool is managed.

(E3. Estimating unit 56)
Next, with reference to FIG. 8, the function of the estimation unit 56 shown in FIG. 3 will be described. FIG. 8 is a graph showing the transition information 122 shown in FIG. 7.

The transition information 122 shown in FIG. 7 shows the relationship between the total usage amount of the tool “A1” of the tool type “A” and the tool wear amount of the tool “A1”. The estimation unit 56 estimates the current wear amount of the tool "A2" which is the same type as the tool "A1" based on the transition information 122.

More specifically, first, the estimation unit 56 obtains the current total usage time associated with the tool “A2” to be estimated by referring to the usage amount information 124 described above. As a result, it is assumed that the current total usage time is "T1". Next, the estimation unit 56 refers to the transition information 122 and acquires the wear amount “M1” corresponding to the current total usage time “T1”. The wear amount "M1" is regarded as the current wear amount of the tool "A2". The wear amount “M1” is output to the execution determination unit 58.

(E4. Execution judgment unit 58)
Subsequently, with reference to FIG. 8, the function of the execution determination unit 58 shown in FIG. 3 will be described.

The execution determination unit 58 determines whether or not to execute the measurement process by the measurement unit 140 based on the estimation result of the current wear amount by the estimation unit 56. As an example, the execution determination unit 58 determines that the measurement process by the measurement unit 140 is not executed when the current wear amount of the tool is equal to or less than the threshold value “th1”. On the other hand, the execution determination unit 58 determines that the measurement process by the measurement unit 140 is executed when the current wear amount of the tool exceeds the threshold value “th1”.

The threshold value “th1” may be set in advance or may be arbitrarily set by the operator. Preferably, the threshold value "th1" is calculated for each tool based on the limit value "th2" of the amount of wear.

The limit value "th2" indicates the limit tool wear amount or the tool wear amount immediately before the limit. The limit value "th2" may be set in advance or may be arbitrarily set by the operator. The threshold value "th1" is calculated by multiplying the limit value "th2" by a predetermined ratio. The value of the ratio is arbitrary, but is, for example, 95%.

The timing at which the determination process is executed by the execution determination unit 58 is arbitrary. As an example, the execution determination unit 58 executes a determination process at the timing when the used tool is stored in the magazine 170 (see FIG. 1). Preferably, as the total amount of tools used increases, the frequency of execution of the determination process by the execution determination unit 58 increases. This makes it possible to further reduce the possibility of missing the tool replacement timing. The execution frequency of the determination process by the execution determination unit 58 means the number of times the determination process is executed per predetermined unit usage amount.

As an example, it is assumed that the determination process by the execution determination unit 58 is executed at each timing when the tool usage amount is "T1" to "T3". In this case, the tool usage amounts "T1" to "T3" satisfy the relationship of the following equations (1) and (2).

T1 <T2 <T3 ... (1)
T2-T1> T3-T2 ... (2)
When the current total usage amount of the tool "A2" is "T1", the estimation unit 56 considers the current wear amount of the tool "A2" to be "M1" according to the transition information 122. In this case, since the current wear amount “M1” is equal to or less than the predetermined threshold value “th1”, the execution determination unit 58 determines that the tool wear amount measurement process is not executed.

Further, when the current total usage amount of the tool "A2" is "T2", the estimation unit 56 considers the current wear amount of the tool "A2" to be "M2" according to the transition information 122. In this case, since the current wear amount “M2” exceeds the predetermined threshold value “th1”, the execution determination unit 58 determines that the tool wear amount measurement process is executed.

Further, when the current total usage amount of the tool "A2" is "T3", the estimation unit 56 considers the current wear amount of the tool "A2" to be "M3" according to the transition information 122. In this case, since the current wear amount “M3” exceeds the predetermined threshold value “th1”, the execution determination unit 58 determines that the tool wear amount measurement process is executed.

When the execution determination unit 58 determines to execute the tool wear amount measurement process, the machine tool 100 executes the wear amount measurement process by the measurement unit 140.

More specifically, first, the machine tool 100 controls the position driving unit 110B (see FIG. 2) described above, and moves the spindle head 130 to a predetermined position. By moving the spindle head 130 to the predetermined position, the tool "A2" to be measured is included in the photographing field CR of the camera 141 (see FIG. 3). Next, the machine tool 100 rotates the spindle 132 to a predetermined rotation angle by controlling the above-mentioned rotation drive unit 110A (see FIG. 2). As a result, the worn portion of the tool "A2" is directed toward the camera 141.

After that, the machine tool 100 outputs a shooting instruction to the camera 141. As a result, the monitoring unit 54 acquires the tool image IM1 showing the tool “A2” from the camera 141.

Typically, the machine tool 100 outputs a shooting instruction to the camera 141 with the light source 145 (see FIG. 3) turned on and the light source 147 (see FIG. 3) turned off, and acquires the tool image IM1. .. As a result, the tool image IM1 can be obtained with the tool illuminated from the direction of the camera.

Alternatively, the monitoring unit 54 may output a shooting instruction to the camera 141 with the light source 145 turned off and the light source 147 turned on, and acquire the silhouette image of the tool 134 as the tool image IM1.

Next, the machine tool 100 measures the amount of wear of the tool "A2" based on the tool image IM1 obtained from the camera 141. Various image processing algorithms can be used for the wear amount measurement process using the tool image IM1. As an example, the machine tool 100 detects the amount of tool wear using a trained model.

The trained model is pre-generated by a training process using a training data set. The training dataset contains multiple training images showing the tools. Each learning image is associated with a label indicating the type of tool and the amount of wear of the tool. The internal parameters of the trained model are pre-optimized by the training process using such a training data set.

Various machine learning algorithms can be adopted as the learning method for generating the trained model. As an example, as the machine learning algorithm, deep learning, convolutional neural network (CNN), full-thickness convolutional neural network (FCN), support vector machine and the like are adopted.

The machine tool 100 sets a predetermined rectangular area on the tool image IM1, shifts the rectangular area on the tool image IM1, and sequentially inputs partial images in the rectangular area to the trained model. As a result, the trained model outputs the tool wear amount as a score. The machine tool 100 specifies a partial image in which the tool wear amount exceeds a predetermined value and the tool wear amount is maximum, and the tool wear amount output for the partial image is adopted as a measurement result.

The method for measuring the amount of tool wear is not limited to the above-mentioned method using the trained model, and image processing based on the rule base may be adopted. Alternatively, the tool wear amount may be input by the operator. In this case, the operator confirms the tool or the tool image, and measures the amount of tool wear using a measuring tool or the like.

(E5. First error handling unit 60)
Subsequently, with reference to FIG. 8, the function of the first abnormality handling unit 60 shown in FIG. 3 will be described.

When the measurement result by the measuring unit 140 shows an abnormality, the first abnormality processing unit 60 performs a predetermined abnormality handling process (first abnormality handling process). Whether or not to carry out the predetermined abnormality handling process is determined based on, for example, the limit value “th2” of the tool wear amount.

As an example, in the measurement process executed when the tool usage amount is "T2", it is assumed that the tool wear amount is "M2'" as an actual measurement result. In this case, since the tool wear amount "M2'" does not exceed the limit value "th2", the first abnormality handling unit 60 does not perform the abnormality handling process.

As another example, in the measurement process executed when the tool usage amount is "T3", it is assumed that the tool wear amount is "M3'" as an actual measurement result. In this case, since the tool wear amount "M3'" exceeds the limit value "th2", the first abnormality handling unit 60 performs the abnormality handling process.

The abnormality handling process is, for example, a process of outputting a warning for prompting an operator to change a tool. The warning indicates that the wear of the tool has reached the limit or the wear of the tool is approaching the limit. The output mode of the warning is arbitrary. As an example, the warning may be displayed on the display of the machine tool 100, may be output by voice, or may be output as data in a report format. Preferably, the warning includes the type of tool to be replaced and the storage location of the tool. By outputting the warning, the operator can replace the tool with a new one.

As another example, the abnormality handling process is a process of stopping the processing of the machine tool 100. This makes it possible to prevent a tool with advanced wear from being used for machining.

(E6. Tolerance range acquisition unit 62)
Next, with reference to FIG. 9, the function of the allowable range acquisition unit 62 shown in FIG. 3 will be described. FIG. 9 is a diagram in which a permissible range 123 is added to the transition information 122 shown in FIG. 7.

The permissible range acquisition unit 62 acquires the permissible range of the measurement result by the measurement unit 140. More specifically, the wear amount of the tool specified in the transition information 122 is associated with an allowable range according to the total usage amount of the tool. In the example of FIG. 9, the allowable range 123 is associated with the wear amount of the tool “A1” of the tool type “A”.

The allowable range 123 is defined by a lower limit 123A and an upper limit 123B. The tool wear amount indicated by the transition information 122 changes between the lower limit 123A and the upper limit 123B. The permissible range 123 becomes narrower as the total amount of tools used increases. As an example, the permissible range ΔRA in the tool usage amount “T5” is wider than the permissible range ΔRB in the tool usage amount “T6” (> T5).

As a more specific process, the permissible range acquisition unit 62 acquires the total amount of the tool “A2” used at the execution timing of the measurement process by the measurement unit 140. Next, the permissible range acquisition unit 62 acquires the permissible range associated with the acquired total usage amount based on the transition information 122. As an example, when the current total usage amount is "T5", the allowable range acquisition unit 62 acquires the allowable range ΔRA in the current total usage amount "T5". The acquired allowable range is output to the second abnormality processing unit 64.

(E7. Second error handling unit 64)
Subsequently, with reference to FIG. 9, the function of the second abnormality handling unit 64 shown in FIG. 3 will be described.

The second abnormality handling unit 64 executes a predetermined abnormality handling process (second abnormality handling process) when the actual measurement result of the tool wear amount is out of the allowable range acquired by the allowable range acquisition unit 62. ..

As an example, in the measurement process executed when the tool usage amount is "T5", it is assumed that the tool wear amount is "M5'" as an actual measurement result. Since the measured value "M5'" is included in the permissible range ΔRA in the current total usage amount "T5", the second abnormality processing unit 64 determines that it is normal and does not perform the predetermined abnormality handling process.

As another example, in the measurement process executed when the tool usage amount is "T6", it is assumed that the tool wear amount is "M6'" as an actual measurement result. Since the measured value "M6'" is out of the permissible range ΔRB in the current total usage amount "T5", the second abnormality processing unit 64 determines that it is abnormal and implements a predetermined abnormality handling process. As described above, when the actual measurement result of the tool wear amount deviates greatly from the estimation result, the second abnormality handling unit 64 carries out a predetermined abnormality handling process.

The abnormality handling process is, for example, a process of outputting a warning. The warning may be displayed on the display of the machine tool 100, may be output by voice, or may be output as data in a report format. This allows the operator to find out the reason why the actual measurement result of the tool wear amount deviates greatly from the estimation result.

(E8. Update unit 66)
Next, with reference to FIG. 10, the function of the update unit 66 shown in FIG. 3 will be described.

The update unit 66 updates the transition information 122 based on the measurement result of the tool wear amount by the measurement unit 140. FIG. 10 is a diagram showing the updated transition information 122.

When the tool wear amount measurement process is executed for the tool "A2" of the same type as the tool "A1", the update unit 66 adds the measurement result to the transition information 122. As a result, the transition of the tool wear amount with respect to the tool usage amount is updated, and the machine tool 100 can determine whether or not to execute the measurement process by the measuring unit 140 based on the newer transition information.

When the transition information 122 is updated, the update unit 66 regenerates an approximate expression showing the correlation between the tool usage amount and the tool wear amount based on the update transition information 122. The approximation formula is generated, for example, by polynomial approximation or linear approximation.

<F. Hardware configuration of operation panel 20>
Next, with reference to FIG. 11, the hardware configuration of the operation panel 20 shown in FIG. 2 will be described. FIG. 11 is a diagram showing an example of the hardware configuration of the operation panel 20.

The operation panel 20 includes a control circuit 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, a communication interface 204, a display 205, an operation key 206, and an auxiliary storage device 220. These components are connected to the internal bus B2.

The control circuit 201 is composed of, for example, at least one integrated circuit. The integrated circuit may be, for example, at least one CPU (Central Processing Unit), at least one GPU (Graphics Processing Unit), at least one ASIC (Application Specific Integrated Circuit), at least one FPGA (Field Programmable Gate Array), or them. It may be composed of a combination of.

The control circuit 201 controls the operation of the operation panel 20 by executing various programs such as the control program 222. The control program 222 defines an instruction for controlling the operation panel 20. The control circuit 201 reads the control program 222 from the auxiliary storage device 220 or the ROM 202 to the RAM 203 based on the reception of the execution command of the control program 222. The RAM 203 functions as a working memory and temporarily stores various data necessary for executing the control program 222.

The communication interface 204 is a communication unit for realizing communication using a LAN (Local Area Network) cable, WLAN, Bluetooth (registered trademark), or the like. As an example, the operation panel 20 realizes communication with an external device such as the CNC unit 30 via the communication interface 204.

The display 205 is, for example, a liquid crystal display, an organic EL display, or other display device. The display 205 sends an image signal for displaying an image to the display 205 according to a command from the control circuit 201 or the like. The display 205 is composed of, for example, a touch panel, and accepts various operations on the machine tool 100 by touch operations.

The operation key 206 is composed of a plurality of hardware keys and accepts various user operations on the operation panel 20. A signal corresponding to the pressed key is output to the control circuit 201.

The auxiliary storage device 220 is a storage medium such as a hard disk or a flash memory. The auxiliary storage device 220 stores the control program 222 and the like. The storage location of the control program 222 is not limited to the auxiliary storage device 220, and may be stored in the storage area of the control circuit 201 (for example, cache memory), ROM 202, RAM 203, an external device (for example, a server), or the like.

The control program 222 may be provided by being incorporated into a part of an arbitrary program, not as a single program. In this case, various processes according to the present embodiment are realized in cooperation with an arbitrary program. Even a program that does not include such a part of the modules does not deviate from the purpose of the control program 222 according to the present embodiment. Further, some or all of the functions provided by the control program 222 may be realized by dedicated hardware. Further, the operation panel 20 may be configured in the form of a so-called cloud service in which at least one server executes a part of the processing of the control program 222.

<G. Hardware configuration of CNC unit 30>
Next, with reference to FIG. 12, the hardware configuration of the CNC unit 30 shown in FIG. 2 will be described. FIG. 12 is a diagram showing an example of the hardware configuration of the CNC unit 30.

The CNC unit 30 includes a control circuit 301, a ROM 302, a RAM 303, communication interfaces 304 and 305, a fieldbus controller 306, and an auxiliary storage device 320. These components are connected to the internal bus B3.

The control circuit 301 is composed of, for example, at least one integrated circuit. The integrated circuit may be composed of, for example, at least one CPU, at least one GPU, at least one ASIC, at least one FPGA, or a combination thereof.

The control circuit 301 controls the operation of the CNC unit 30 by executing various programs such as the control program 322 and the machining program 323. The control circuit 301 reads the control program 322 from the ROM 302 to the RAM 303 based on the reception of the execution instruction of the control program 322. The RAM 303 functions as a working memory and temporarily stores various data necessary for executing the control program 322.

The communication interfaces 304 and 305 are communication units for realizing communication using LAN, WLAN, Bluetooth, or the like. The CNC unit 30 exchanges data with an external device (for example, an operation panel 20) via the communication interface 304. Further, the CNC unit 30 exchanges data with an external device (for example, the information processing device 40) via the communication interface 305.

The fieldbus controller 306 is a communication unit for realizing communication with various units connected to the fieldbus. Examples of the unit connected to the fieldbus include the above-mentioned rotation drive unit 110A (see FIG. 2) and the above-mentioned position drive unit 110B (see FIG. 2).

The auxiliary storage device 320 is a storage medium such as a hard disk or a flash memory. The auxiliary storage device 320 stores the control program 322, the machining program 323, the tool information 326, and the like. In the tool information 326, various information related to the tool such as the tool length and the tool diameter is specified for each tool type.

The storage location of the control program 322, the machining program 323, and the tool information 326 is not limited to the auxiliary storage device 320, and the storage area of the control circuit 301 (for example, cache memory), ROM 302, RAM 303, and an external device (for example, a server). It may be stored in such as.

The control program 322 may be provided by being incorporated into a part of an arbitrary program, not as a single program. In this case, various processes according to the present embodiment are realized in cooperation with an arbitrary program. Even a program that does not include such a part of the modules does not deviate from the purpose of the control program 322 according to the present embodiment. Further, some or all of the functions provided by the control program 322 may be realized by dedicated hardware. Further, the CNC unit 30 may be configured in the form of a so-called cloud service in which at least one server executes a part of the processing of the control program 322.

<H. Hardware configuration of information processing device 40>
Next, with reference to FIG. 13, the hardware configuration of the information processing apparatus 40 shown in FIG. 2 will be described. FIG. 13 is a diagram showing an example of the hardware configuration of the information processing apparatus 40.

The information processing device 40 includes a control circuit 401, a ROM 402, a RAM 403, communication interfaces 404 and 405, and an auxiliary storage device 420. These components are connected to the internal bus B4. The ROM 402, RAM 403, and auxiliary storage device 420 are examples of the above-mentioned storage device 120 (see FIG. 5).

The control circuit 401 is composed of, for example, at least one integrated circuit. The integrated circuit may be composed of, for example, at least one CPU, at least one GPU, at least one ASIC, at least one FPGA, or a combination thereof.

The control circuit 401 controls the operation of the information processing apparatus 40 by executing various programs such as the control program 422. The control circuit 401 reads the program to be executed from the auxiliary storage device 420 or the ROM 402 to the RAM 403 based on the reception of the execution instructions of the various programs. The RAM 403 functions as a working memory and temporarily stores various data necessary for executing a program.

The communication interface 404 is a communication unit for realizing communication using LAN, WLAN, Bluetooth, or the like. The information processing device 40 exchanges data with an external device (for example, CNC unit 30) via the communication interface 404. Further, the information processing device 40 exchanges image data with an external device (for example, a camera 141) via the communication interface 405.

The auxiliary storage device 420 is a storage medium such as a hard disk or a flash memory. The auxiliary storage device 420 stores the above-mentioned transition information 122 (see FIG. 6), the above-mentioned usage amount information 124 (see FIG. 7), the control program 422, and the like. These storage locations are not limited to the auxiliary storage device 420, and may be stored in a storage area of the control circuit 401 (for example, a cache memory), a ROM 402, a RAM 403, an external device (for example, a server), or the like.

The control program 422 may be provided by being incorporated into a part of an arbitrary program, not as a single program. In this case, the process according to the present embodiment is realized in cooperation with an arbitrary program. Even a program that does not include such a part of the modules does not deviate from the purpose of the machine tool 100 according to the present embodiment. Further, some or all of the functions provided by the control program 422 according to the present embodiment may be realized by dedicated hardware. Further, the machine tool 100 and the server may cooperate with each other to realize the processing according to the present embodiment. Further, the information processing apparatus 40 may be configured in the form of a so-called cloud service in which at least one server realizes the processing according to the present embodiment.

<I. Control flow of machine tool 100>
Next, the control structure of the machine tool 100 will be described with reference to FIG. FIG. 14 is a flowchart showing a part of the processing executed by the control unit 50 of the machine tool 100.

Part or all of the processing shown in FIG. 14 is implemented in the control program 222 (see FIG. 11), the control program 322 (see FIG. 12), or the control program 422 (see FIG. 13) described above. .. In other aspects, some or all of the processing shown in FIG. 14 may be implemented in circuit elements or other hardware.

In step S150, the control unit 50 determines whether or not the timing for determining the execution of the measurement process has arrived. The timing comes to the free time when the work is not processed. As an example, the timing may be one timing when the spindle 132 is stopped, or may be a timing when the tool is stored in the magazine 170 after the machining is completed. When the control unit 50 determines that the timing for determining the execution of the measurement process has arrived (YES in step S150), the control unit 50 switches the control to step S152. If not (NO in step S150), the control unit 50 ends the process shown in FIG.

In step S152, the control unit 50 functions as the above-mentioned transition information acquisition unit 52 (see FIG. 5) and acquires the above-mentioned transition information 122. Since the transition information 122 is as described with reference to FIG. 6, the description thereof will not be repeated.

In step S154, the control unit 50 functions as the estimation unit 56 (see FIG. 5) described above, and obtains the total usage time of the tool to be measured with reference to the usage amount information 124 described above. Since the usage amount information 124 is as described with reference to FIG. 7, the description thereof will not be repeated.

In step S156, the control unit 50 functions as the estimation unit 56 described above, and with reference to step S152, acquires the current wear amount corresponding to the current total usage amount acquired in step S154 as the estimation result. Since the function of the estimation unit 56 is as described above, the description thereof will not be repeated.

In step S160, the control unit 50 functions as the execution determination unit 58 (see FIG. 5) described above, and the current wear amount as the estimation result acquired in step S156 exceeds the predetermined threshold value “th1” (see FIG. 8). Judge whether or not. When the control unit 50 determines that the current wear amount exceeds the predetermined threshold value “th1” (YES in step S160), the control unit 50 switches the control to step S162. If not (NO in step S160), the process shown in FIG. 14 is terminated.

In step S162, the control unit 50 executes the measurement process by the measurement unit 140. Since the measurement process is as described above, the description thereof will not be repeated. By the measurement process in step S162, the tool wear amount as an actually measured value can be obtained.

In step S170, the control unit 50 determines whether or not the current wear amount obtained by the measurement process in step S162 exceeds the predetermined threshold value “th2” (see FIG. 8). The predetermined threshold value “th2” is larger than the predetermined threshold value “th1”. When the control unit 50 determines that the current wear amount exceeds the predetermined threshold value “th2” (YES in step S170), the control unit 50 switches the control to step S172. If not (NO in step S170), the control unit 50 switches control to step S174.

In step S172, the control unit 50 functions as the above-mentioned first abnormality processing unit 60 (see FIG. 5), and carries out a predetermined first abnormality handling process. Since the function of the first exception handling unit 60 is as described above, the description thereof will not be repeated.

In step S174, the control unit 50 functions as the above-mentioned allowable range acquisition unit 62 (see FIG. 5), and refers to the above-mentioned transition information 122 (see FIG. 9) to the current total usage amount acquired in step S154. Get the corresponding tolerance. Since the function of the permissible range acquisition unit 62 is as described above, the description thereof will not be repeated.

In step S180, the control unit 50 determines whether or not the current wear amount of the measurement result obtained by the measurement process in step S162 is out of the allowable range obtained in step S174. When the control unit 50 determines that the current wear amount of the measurement result is out of the allowable range (YES in step S180), the control unit 50 switches the control to step S182. If not (NO in step S180), the process shown in FIG. 14 is terminated.

In step S182, the control unit 50 functions as the above-mentioned second abnormality processing unit 64 (see FIG. 5), and carries out a predetermined second abnormality handling process. Since the function of the second exception handling unit 64 is as described above, the description thereof will not be repeated.

<J. Summary>
As described above, the machine tool 100 determines whether or not it is necessary to measure the tool wear amount for the current tool with reference to the past transition of the tool wear amount. Then, the machine tool 100 executes the tool wear amount measurement process only when it is determined that the tool wear amount measurement process is necessary. As a result, the number of times the measurement process is executed by the measuring unit 140 is reduced, and the possibility of missing the tool replacement time is reduced.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

20 operation panel, 30 CNC unit, 40 information processing device, 50 control unit, 52 transition information acquisition unit, 54 monitoring unit, 56 estimation unit, 58 execution judgment unit, 60 first abnormality processing unit, 62 tolerance acquisition unit, 64 2nd abnormality processing unit, 66 update unit, 100 machine tool, 110A rotary drive unit, 110B position drive unit, 111B, 111C, 111X, 111Y, 111Z servo driver, 120 storage device, 122 transition information, 123 allowable range, 123A lower limit , 123B upper limit, 124 usage information, 126 tool usage history, 130 spindle head, 131 spindle cylinder, 132 spindle, 134 tool, 140 measuring unit, 141 camera, 142 objective lens, 145,147 light source, 160 ATC, 170 magazine, 201, 301, 401 control circuit, 202, 302, 402 ROM, 203, 303, 403 RAM, 204, 304, 305, 404, 405 communication interface, 205 display, 206 operation keys, 220, 320, 420 auxiliary storage, 222,322,422 Control Program, 306 Field Bus Controller, 323 Machining Program, 326 Tool Information.

Claims (7)

It ’s a machine tool,
A spindle on which tools can be mounted and
A measuring unit for measuring the amount of wear of the tool mounted on the spindle, and
A control unit for controlling the machine tool is provided.
The control unit
Processing to acquire transition information indicating the transition of the wear amount of the first tool according to the total usage amount of the first tool, and
When a second tool of the same type as the first tool is mounted on the spindle, the wear of the second tool by the measuring unit is based on the transition information and the current total usage amount of the second tool. The process of determining whether to execute the quantity measurement process and
If the measurement result by the measuring unit indicates an abnormality, it performs a process of performing the predetermined first abnormality coping process,
The wear amount of the first tool defined in the transition information is associated with an allowable range according to the total usage amount of the first tool.
The control unit further
A process of acquiring the total usage amount of the second tool at the execution timing of the measurement process and acquiring an allowable range associated with the acquired total usage amount based on the transition information.
A machine tool that executes a process of performing a predetermined second abnormality handling process when the measurement result of the wear amount of the second tool at the execution timing is not included in the acquired allowable range. The machine tool according to claim 1, wherein the execution frequency of the determination process increases as the total amount of the second tool used increases. The control unit further executes a process of estimating the current wear amount of the second tool based on the transition information and the current total usage amount of the second tool.
The first or second aspect of the present invention, wherein the control unit determines that the measurement process by the measurement unit is not executed when the current wear amount of the second tool is equal to or less than a predetermined amount in the determination process. Machine tools. The machine tool according to any one of claims 1 to 3, wherein the allowable range defined according to the total usage amount of the first tool becomes narrower as the total usage amount of the first tool increases. The machine tool according to any one of claims 1 to 4 , wherein the control unit further executes a process of updating the transition information based on the measurement result of the wear amount of the second tool by the measurement unit. machine. It ’s a machine tool control method.
The machine tool
A spindle on which tools can be mounted and
It is equipped with a measuring unit for measuring the amount of wear of the tool mounted on the spindle.
The control method is
A step of acquiring transition information indicating a transition of the wear amount of the first tool according to the total usage amount of the first tool, and a step of acquiring the transition information.
When a second tool of the same type as the first tool is mounted on the spindle, the wear of the second tool by the measuring unit is based on the transition information and the current total usage amount of the second tool. Steps to determine whether to perform quantity measurement processing,
A step of performing a predetermined abnormality handling process when the measurement result by the measuring unit indicates an abnormality is provided.
The wear amount of the first tool defined in the transition information is associated with an allowable range according to the total usage amount of the first tool.
The control method further
A step of acquiring the total usage amount of the second tool at the execution timing of the measurement process and acquiring an allowable range associated with the acquired total usage amount based on the transition information.
A control method comprising a step of performing a predetermined second abnormality handling process when the measurement result of the wear amount of the second tool at the execution timing is not included in the acquired allowable range. A machine tool control program
The machine tool
A spindle on which tools can be mounted and
It is equipped with a measuring unit for measuring the amount of wear of the tool mounted on the spindle.
The control program is applied to the machine tool.
A step of acquiring transition information indicating a transition of the wear amount of the first tool according to the total usage amount of the first tool, and a step of acquiring the transition information.
When a second tool of the same type as the first tool is mounted on the spindle, the wear of the second tool by the measuring unit is based on the transition information and the current total usage amount of the second tool. Steps to determine whether to perform quantity measurement processing,
When the measurement result by the measuring unit indicates an abnormality, the step of executing a predetermined abnormality handling process and the step of executing the step are executed.
The wear amount of the first tool defined in the transition information is associated with an allowable range according to the total usage amount of the first tool.
The control program is applied to the machine tool and further.
A step of acquiring the total usage amount of the second tool at the execution timing of the measurement process and acquiring an allowable range associated with the acquired total usage amount based on the transition information.
A control program for executing a step of executing a predetermined second abnormality handling process when the measurement result of the wear amount of the second tool at the execution timing is not included in the acquired allowable range.

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