JP2021000665A - Discrimination device, discrimination system and discrimination method for tool corner radius - Google Patents

Abstract

To provide a discrimination device for a tool corner radius which enables correctness of a corner radius of a tool tip to be recognized with a high degree of accuracy, and furthermore allows for significant reduction of a cost therefor.SOLUTION: A discrimination device 10 is provided that is connected to: a touch sensor 6 having a probe 7; and a mobile device 5 which changes a relative position between the touch sensor and a tool 2 which has a tip 4 being an edge 4a of tool and in which a corner radius is formed, the discrimination device 10 comprises: a movement control unit which controls the mobile device in such a way that the probe comes in contact with each of at least three points separated from each other in a circumferential direction at the tooth point of the tip; a coordinate calculation unit which calculates each coordinate of at least three points from each signal obtained by contact of the probe with at least three points; and a discrimination information calculation unit which calculates information for discriminating whether the tip corner radius is correct or not on the basis of each calculated coordinate.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a corner radius discriminating device, a discriminating system, and a discriminating method for a tool having a tip having a predetermined corner radius at the cutting edge.

As a tool used for turning or the like, it is known that a disposable tip (blade) called a cutting edge replacement tip is fixed to a tool body to form a cutting edge of the tool. In the case of this tool, a tip having a corner radius of the cutting edge that meets the target shape of machining and the requirement for machined surface roughness is selected and attached to the tool body. Then, the stylus of the touch sensor is brought into contact with the tip of the tool, and the computer correctly recognizes the position of the cutting edge of the tool before starting machining (see, for example, Patent Document 1).

Jitsufuku No. 3-30804

In such a tool, it is necessary to attach a cutting edge replacement tip having a corner radius that meets the target shape of machining and the requirement of machined surface roughness to the tool body. However, the difference in the corner radius of the cutting edge replacement tip is difficult to visually discern, and there is a possibility that a tip having a shape different from the intended one may be mistakenly attached to the tool body. Therefore, a method for ensuring that the corner radius of the chip is correct is required.

As a method of measuring the corner radius of the tip, a camera installed in the machine tool takes a picture of the tip attached to the tool body, and the shape of the cutting edge of the tip is recognized by image processing technology from the taken image. is there. However, this method requires a high equipment cost for shooting and image processing, and oil and water droplets adhere to the chip and the camera depending on the shooting environment, so that a separate removing means is required.

Therefore, an object of the present invention is to make it possible to accurately grasp whether or not the corner radius of the tool tip is correct, and to significantly reduce the cost for that purpose.

The device for determining the corner radius of a tool according to one aspect of the present disclosure is a movement that changes the relative position between a touch sensor having a stylus and a tool having a tip having a corner as a cutting edge and the touch sensor. A discrimination device connected to the device, a movement control unit that controls the moving device so that the stylus comes into contact with at least three points separated from each other in the circumferential direction of the cutting edge of the chip, and the above. Whether the corner radius of the chip is correct based on the coordinate calculation unit that calculates each coordinate of the at least three points from each signal obtained by the stylus contacting at least three points and each of the calculated coordinates. It is provided with a discrimination information calculation unit that calculates information for determining whether or not to use it.

According to the above configuration, no device for photographing and image processing is required, and by using the existing touch sensor, information for determining whether or not the corner radius of the chip is correct is calculated. The cost for determining the corner radius can be kept low. Further, since the stylus of the touch sensor may be brought into contact with at least three points on the cutting edge of the chip, the coordinates can be calculated correctly even in a measurement environment in which oil or water droplets adhere to the chip. Therefore, while making it possible to accurately grasp whether or not the corner radius of the tool tip is correct, the cost for that purpose can be significantly suppressed.

As an example, a storage unit that stores a specified corner radius required for the cutting edge and a determination unit that determines whether or not the corner radius of the tip matches the specified corner radius based on the calculated coordinates. And, may be further provided and configured.

According to the above configuration, the conformity of the actual corner radius with respect to the specified corner radius is determined, and it is possible to accurately grasp whether or not the corner radius of the tool tip is correct.

As an example, the storage unit sets the tangential direction of the corner radius at the first point and the second point among the at least three points including the first point, the second point, and the third point as the first tangent direction and the first tangent direction. Stored as two tangent directions, the movement control unit controls the movement device so that the stylus comes into contact with the first point and the second point, respectively, and the determination unit calculates with the coordinate calculation unit. The first tangent line, which is the tangent line at the first point, was calculated by using the coordinates of the first point and the first tangent direction stored in the storage unit, and was calculated by the coordinate calculation unit. Using the coordinates of the second point and the second tangent direction stored in the storage unit, a second tangent line which is a tangent line at the second point is calculated, and the first tangent line and the second tangent line are combined with each other. The coordinates of the intersection of the above points are calculated as the start point coordinates, and the first radius line orthogonal to the first tangent line and passing through the first point and the second radius line orthogonal to the second tangent line and passing through the second point. The coordinate of the intersection of the above points is calculated as the center coordinate, and the movement control unit moves the stylus relative to the start point coordinate in a direction approaching the center coordinate so that the stylus comes into contact with the third point. The moving device is controlled, and the determination unit determines the corner radius of the chip based on the moving distance of the moving device between the coordinates of the third point and the starting point coordinates calculated by the coordinate calculation unit. It may be configured to determine whether or not it matches the specified corner radius.

According to the above configuration, the tangential directions at the first and second points, which are the contact positions of the touch sensor at the cutting edge, are stored in advance, and the starting point coordinates, which are the intersections of the tangents of the first and second points, are specified in advance. Since it is possible, the corner radius can be determined based on the moving distance of the moving device between the coordinates of the third point and the coordinates of the starting point. Therefore, three contact points of the touch sensor for determining the corner radius are sufficient, and the corner radius determination work can be performed in a short time.

As an example, the movement control unit determines the first point and the second point so that the first tangential direction and the second tangential direction are orthogonal to each other, and the stylus is used as the first point and the second point. Assuming that the moving device is controlled so as to be in contact with the second point, the moving distance is L, the radius of curvature of the specified corner radius is R, and the predetermined tolerance is α, the determination unit uses the following formula (1). ), It is determined that the corner radius of the chip matches the specified corner radius, and when the following formula (1) is not satisfied, it is determined that the corner radius of the chip does not match the specified corner radius. May be good.
[Number 1]
R {(√2) -1} -α <L <R {(√2) -1} + α ... (1)

According to the above configuration, since the tangents of the first point and the second point are orthogonal to each other, the mathematical formula for determining the matching of the actual corner radius with respect to the specified corner radius can be simplified.

The tool corner radius discrimination system according to one aspect of the present disclosure includes the discriminating device and the touch sensor connected to the discriminating device and having the stylus, and the stylus is the cutting edge of the tool. The movement control unit of the discriminating device has a vertical surface portion and a horizontal surface portion that are in contact with each other and are orthogonal to each other, and a chamfered portion that chamfers a corner portion between the vertical surface portion and the horizontal surface portion. The moving device is controlled so that the vertical surface portion is brought into contact with the first point, the horizontal surface portion is brought into contact with the second point, and the chamfered portion is brought into contact with the third point.

According to the above configuration, the stylus can be brought into contact with the first to third points without changing the posture of the touch sensor and the tool so much, and it is possible to prevent the occurrence of an error due to the posture change.

The method for determining the corner radius of the tool according to one aspect of the present disclosure is such that the tool and the touch are brought into contact with each other at least three points on the cutting edge of the tip of the tool that are separated from each other in the circumferential direction. The relative position between the sensor and the sensor is changed, the coordinates of the at least three points are calculated from the signals obtained by the stylus contacting the at least three points, and the coordinates of the at least three points are calculated based on the calculated coordinates. The information for determining whether or not the corner radius of the chip is correct is calculated.

According to the method, similarly, it is possible to accurately grasp whether or not the corner radius of the tip of the tool is correct, but the cost for that purpose can be significantly suppressed.

According to the present disclosure, it is possible to accurately grasp whether or not the corner radius of the tool tip is correct, and at the same time, it is possible to significantly reduce the cost for that purpose.

It is the schematic which shows the determination system of the corner radius of the tool which concerns on embodiment. It is a block diagram of the discrimination apparatus shown in FIG. It is an enlarged view of the chip shown in FIG. (A) to (C) are operation explanatory diagrams of determination of the corner radius. It is a flowchart explaining the process of the discrimination apparatus shown in FIG.

Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a schematic view showing a corner radius determination system 1 of the tool 2 according to the embodiment. As shown in FIG. 1, the discrimination system 1 includes a mobile device 5, a touch sensor 6, and a discrimination device 10. The moving device 5 is a driving device that changes the relative position between the tool 2 and the touch sensor 6, and is a part of the processing device. The moving device 5 is, for example, a moving table, a robot, or the like. The moving device 5 may move the tool 2 or the touch sensor 6. The tool 2 includes a tool body 3 connected to the moving device 5 and a tip 4 fixed to the tip of the tool body 3. The tip 4 is a disposable tip called a cutting edge replacement tip. The cutting edge (corner) of the tip 4 has a corner radius. That is, the cutting edge of the tip 4 has an arc surface. Each side of the tip 4 adjacent to both sides of the cutting edge 4a forms an angle of less than 90 degrees.

The touch sensor 6 includes a support shaft portion 8 provided in the processing apparatus, a stylus 7 fixed to the tip of the support shaft portion 8, and a detection unit 9 provided in the support shaft portion 8. In the touch sensor 6, the detection unit 9 (for example, a strain sensor) detects that the object comes into contact with the stylus 7 and the support shaft portion 8 is distorted, so that the object comes into contact with the stylus 7. Can be grasped at the time when Since the position of the stylus 7 is known, it is possible to grasp the position of the object by grasping the position of the moving device 5 at the time when the contact occurs.

By bringing the stylus 7 of the touch sensor 6 into contact with the cutting edge of the tip 4 of the tool 2, the touch sensor 6 correctly recognizes the position of the cutting edge 4a of the tip 4 by the computer (not shown) of the machining apparatus before starting machining. Used to make it. Further, in the present embodiment, the touch sensor 6 is also used to determine whether or not the corner radius (curvature) of the chip 4 is correct, as will be described later.

The stylus 7 has a roughly cubic shape or a roughly rectangular parallelepiped shape. The stylus 7 has a vertical surface portion 7a and a horizontal surface portion 7b that are orthogonal to each other, and a chamfered portion 7c that chamfers a corner portion between the vertical surface portion 7a and the horizontal surface portion 7b. The cutting edge 4a of the chip 4 may come into contact with the vertical surface portion 7a, the horizontal surface portion 7b, and the chamfered portion 7c.

The detection unit 9 of the mobile device 5 and the touch sensor 6 is electrically connected to the discrimination device 10. The discrimination device 10 is electrically connected to the input device 11 and the display device 12. The discrimination device 10 determines whether or not the corner radius of the chip 4 is correct based on the information input from the input device 11 and the information of the moving device 5 and the touch sensor 6, and displays the discrimination result on the display device 12. Output.

FIG. 2 is a block diagram of the discriminating device 10 shown in FIG. As shown in FIG. 2, in the discrimination device 10, the touch sensor 6 and the input device 11 are connected on the input side, and the moving device 5 and the display device 12 are connected on the output side. In terms of hardware, the discrimination device 10 includes a processor, a volatile memory, a non-volatile memory, an I / O interface, and the like. In terms of functionality, the discrimination device 10 includes a movement control unit 21, a storage unit 22, a coordinate calculation unit 23, and a determination unit 24. The movement control unit 21, the coordinate calculation unit 23, and the determination unit 24 are realized by the processor performing arithmetic processing using the volatile memory based on the program stored in the non-volatile memory. The storage unit 22 is realized by a volatile memory and a non-volatile memory.

When a command to start inspection of the corner radius of the tip 4 to which the tool body 3 is attached is input from the input device 11, the movement control unit 21 controls the movement device 5 to chip the stylus 7 of the touch sensor 6. It is brought into contact with the cutting edge 4a of 4. The movement control unit 21 outputs information on the position of the movement device 5 at the time of the contact to the coordinate calculation unit 23.

The storage unit 22 stores information previously input from the input device 11 for the determination of the determination unit 24. The coordinate calculation unit 23 calculates the coordinates of the contact point on the cutting edge 4a with which the stylus 7 has contacted, based on the signals from the touch sensor 6 and the movement control unit 21. That is, the coordinate calculation unit 23 calculates the coordinates of the contact point on the cutting edge 4a based on the position of the moving device 5 at the time when the stylus 7 comes into contact with the cutting edge 4a. The determination unit 24 determines whether or not the corner radius of the cutting edge 4a of the tip 4 attached to the tool body 3 is correct (that is, whether or not it matches the specified corner radius). That is, the determination unit 24 is an example of a discrimination information calculation unit that calculates information for determining whether or not the corner radius of the cutting edge 4a is correct based on each coordinate calculated by the coordinate calculation unit 23.

FIG. 3 is an enlarged view of the chip 4 shown in FIG. 4 (A) to 4 (C) are operation explanatory views for determining the corner radius. FIG. 5 is a flowchart illustrating the processing of the discriminating device 10 shown in FIG. Hereinafter, the corner radius discrimination process will be described along the flow of the flowchart of FIG. 5 with reference to FIGS. 1 to 4 as appropriate. In the following, an example will be described in which the stylus 7 is brought into contact with three points P1 to P3 (first point P1, second point P2, and third point P3) separated from each other in the circumferential direction of the cutting edge 4a of the tip 4. To do.

As shown in FIG. 3, the cutting edge 4a is an arc surface forming a part of the virtual perfect circle V, and in the present embodiment, the cutting edge 4a has an arc shape (corner radius) forming at least 1/4 of the virtual perfect circle V. Have. The tangent line of the cutting edge 4a at the first point P1 (first tangent line TL1) and the tangent line of the cutting edge 4a at the second point P2 (the second tangent line TL2 are orthogonal to each other. That is, the movement control unit 21 is the first tangent line TL1. The first point P1 and the second point P2 are determined so that the second tangent line TL2 is orthogonal to each other. In other words, the radius line (first radius line RL1) passing through the first point P1 in the virtual perfect circle V. The radius line passing through the second point P2 in the virtual perfect circle V (second radius line RL2) is orthogonal to each other. The third point P3 is between the first point P1 and the second point P2 on the cutting edge 4a. It is an intermediate point.

First, the specified corner radius (correct corner radius) required for the cutting edge 4a is stored in the storage unit 22 from the input device 11 (step S1). Then, the tangential directions at the first point P1 and the second point P2 of the cutting edge 4a to be brought into contact with the stylus 7 are stored in the storage unit 22 from the input device 11 as the first tangential direction and the second tangential direction (step S2). Here, the first tangent direction and the second tangent direction are directions orthogonal to each other. The order of steps S1 and S2 may be reversed. When the first tangent direction and the second tangent direction are always invariant, the first tangent direction and the second tangent direction may be initially stored and the input may be omitted thereafter.

Next, the movement control unit 21 controls the movement device 5 so that the stylus 7 of the touch sensor 6 comes into contact with the first point P1 and the second point P2, respectively (step S3). As shown in FIG. 4A, with respect to the first point P1, the stylus 7 is brought into contact with the first point P1 from the horizontal direction by bringing the vertical surface portion 7a of the stylus 7 into contact with the cutting edge 4a of the tip 4. .. As shown in FIG. 4B, with respect to the second point P2, the stylus 7 is brought into contact with the second point P2 from the vertical direction by bringing the lateral surface portion 7b of the stylus 7 into contact with the cutting edge 4a of the tip 4. .. Then, the coordinate calculation unit 23 calculates the coordinates of the first point P1 and the second point P2 from the signal obtained by the contact of the touch sensor 6 with the first point P1 and the second point P2 of the cutting edge 4a (step S4). ..

As shown in FIG. 3, the determination unit 24 uses the coordinates of the first point P1 calculated by the coordinate calculation unit 23 and the first tangent direction stored in the storage unit 22 to form a tangent line at the first point P1. The first tangent line TL1 is calculated (step S5). Similarly, the determination unit 24 uses the coordinates of the second point P2 calculated by the coordinate calculation unit 23 and the second tangent direction stored in the storage unit 22, and is a second tangent line at the second point P2. The tangent line TL2 is calculated (step S5).

Next, the determination unit 24 calculates the coordinates of the intersection of the first tangent line TL1 and the second tangent line TL2 as the start point coordinate Q (step S6). The determination unit 24 determines the coordinates of the intersection of the first radius line RL1 orthogonal to the first tangent line TL1 and passing through the first point P1 and the second radius line RL2 orthogonal to the second tangent line TL2 and passing through the second point P2. Is calculated as the center coordinate O (step S7). The order of steps S6 and S7 may be reversed from each other.

Next, the movement control unit 21 controls the movement device 5 and moves the touch sensor 6 relative to the chip 4 so that the stylus 7 approaches the center coordinate O from the start point coordinate Q, thereby moving the stylus 7 to the cutting edge. It is brought into contact with the third point P3 of 4a (step S8). At that time, as shown in FIG. 4C, by bringing the chamfered portion 7c of the stylus 7 into contact with the cutting edge 4a of the tip 4, the stylus is measured from an oblique direction forming 45 degrees with respect to the vertical direction and the horizontal direction. 7 is brought into contact with the third point P3. Then, the coordinate calculation unit 23 calculates the coordinates of the third point P3 from the signal obtained by the contact of the touch sensor 6 with the third point P3 of the cutting edge 4a (step S9).

Next, the determination unit 24 calculates the movement distance L of the movement device 5 between the coordinates of the third point P3 and the start point coordinates Q calculated by the coordinate calculation unit 23 (step S10). That is, the moving distance L of the stylus 7 from the position where the chamfered portion 7c of the stylus 7 reaches the start point coordinate Q to the position where it comes into contact with the third point P3 is calculated.

Next, the determination unit 24 determines whether or not the calculated movement distance L satisfies the following mathematical formula (1), that is, whether or not the corner radius of the cutting edge 4a is correct (step S11). The defined corner radius (radius of curvature) is R, and the margin of error is α. The margin of error α may be a minute value or zero.

[Number 1]
R {(√2) -1} -α <L <R {(√2) -1} + α ... (1)

Specifically, when the mathematical formula (1) is satisfied (step S11: Y), the determination unit 24 determines that the corner radius of the cutting edge 4a matches the specified corner radius, and displays on the display device 12 to that effect. (Step S12). On the other hand, when the determination unit 24 does not satisfy the mathematical formula (1) (step S12: N), the determination unit 24 determines that the corner radius of the cutting edge 4a does not match the specified corner radius, and causes the display device 12 to display to that effect. (Step S13).

According to the configuration described above, no device for photographing and image processing is required, and by using the existing touch sensor 6, it is determined that the actual corner radius of the cutting edge 4a matches the specified corner radius. The cost for determining the corner radius of the cutting edge 4a can be kept low. Further, since the stylus 7 of the touch sensor 6 may be brought into contact with the three points of the cutting edge 4a of the chip 4, the coordinates can be calculated correctly even in a measurement environment in which oil or water droplets adhere to the chip 4. Therefore, while it is possible to accurately grasp whether or not the corner radius of the cutting edge 4a of the tip 4 of the tool 2 is correct, the cost for that purpose can be significantly suppressed.

Further, the tangential directions at the first point P1 and the second point P2, which are the contact positions of the touch sensor 6 at the cutting edge 4a, are stored in advance, and are the intersections of the tangent lines TL1 and TL2 of the first point P1 and the second point P2. Since the start point coordinate Q can be specified in advance, the corner radius of the cutting edge 4a can be determined based on the movement distance L of the moving device 5 between the coordinates of the third point P3 and the start point coordinate Q. Therefore, three contact points of the touch sensor 6 for determining the corner radius are sufficient, and the corner radius determination work can be performed in a short time. Moreover, since the first point P1 and the second point P2 are set so that the first tangent line TL1 and the second tangent line TL2 are orthogonal to each other, a mathematical formula for determining the matching of the actual corner radius with respect to the specified corner radius. (1) becomes simple.

Further, in the touch sensor 6, the vertical surface portion 7a of the stylus 7 is brought into contact with the first point P1 of the cutting edge 4a, the lateral surface portion 7b of the stylus 7 is brought into contact with the second point P2 of the cutting edge 4a, and the surface of the stylus 7 is brought into contact. Since the chamfer 7c is brought into contact with the third point P3 of the cutting edge 4a, a series of steps of bringing the stylus 7 into contact with each of the first point P1, the second point P2 and the third point P3 (FIG. 4 (A)). In (C), it is not necessary to change the posture of the tool 2, and the occurrence of an error due to the change in the posture of the tool 2 is prevented.

The present invention is not limited to the above-described embodiment, and its configuration can be changed, added, or deleted. For example, when the stylus 7 of the touch sensor 6 is brought into contact with the first point P1, the second point P2, and the third point P3 of the cutting edge 4a, the same surface of the stylus 7 is changed by changing the posture of the tool 2. The first point P1, the second point P2, and the third point P3 may be brought into contact with each other. Further, instead of the determination unit 24, a calculation unit that calculates the corner radius of the cutting edge 4a based on each coordinate calculated by the coordinate calculation unit 23 may be provided as the determination information calculation unit. In that case, the user may determine whether or not the actual corner radius of the cutting edge 4a matches the specified corner radius by looking at the calculated corner radius. Further, the points where the stylus 7 of the touch sensor 6 is brought into contact with the cutting edge 4a may be four or more points. Further, the first point P1 and the second point P2 may be determined so that the first tangent direction and the second tangent direction are non-orthogonal. Further, when the chip 4 itself has a manufacturing error of the corner radius, the machining control may be corrected based on the error between the corner radius (measured value) calculated by the system 1 and the specified corner radius. .. Further, the tip 4 may be irreplaceably fixed to the tool body 3 instead of being a cutting edge replacement tip. In that case, when the worn tip after use is polished and regenerated, the system 1 may determine whether the corner radius after the polishing is appropriate, or the system 1 may make a mistake in attaching the tool itself. You may discriminate.

1 Discrimination system 2 Tool 4 Chip 4a Cutting edge 5 Moving device 6 Touch sensor 7 Stylus 7a Vertical surface 7b Horizontal surface 7c Chamfering 10 Discriminating device 21 Movement control 22 Storage 23 Coordinate calculation 24 Judgment P1 1st point P2 2nd point P3 3rd point

Claims (6)

A discriminating device connected to a touch sensor having a stylus, a moving device that changes the relative position between a tool having a tip having a corner formed as a cutting edge, and the touch sensor.
A movement control unit that controls the moving device so that the stylus comes into contact with at least three points separated from each other in the circumferential direction at the corner of the chip.
A coordinate calculation unit that calculates each coordinate of the at least three points from each signal obtained by contacting the stylus with the at least three points.
A device for determining the corner radius of a tool, comprising a discrimination information calculation unit that calculates information for determining whether or not the corner radius of the tip is correct based on the calculated coordinates. A storage unit that stores the specified corner radius required for the cutting edge,
The device for determining the corner radius of the tool according to claim 1, further comprising a determination unit for determining whether or not the corner radius of the chip matches the specified corner radius based on the calculated coordinates. .. The storage unit sets the tangential direction of the corner radius at the first point and the second point among the at least three points including the first point, the second point, and the third point as the first tangential direction and the second tangential direction. Remember as
The movement control unit controls the movement device so that the stylus comes into contact with the first point and the second point, respectively.
The determination unit
Using the coordinates of the first point calculated by the coordinate calculation unit and the first tangent direction stored in the storage unit, the first tangent line which is the tangent line at the first point is calculated.
Using the coordinates of the second point calculated by the coordinate calculation unit and the second tangent direction stored in the storage unit, a second tangent line which is a tangent line at the second point is calculated.
The coordinates of the intersection of the first tangent line and the second tangent line are calculated as start point coordinates, and the first radius line orthogonal to the first tangent line and passing through the first point and orthogonal to the second tangent line are said to be orthogonal to the first tangent line. Calculate the coordinates of the intersection with the second radius line passing through the second point as the center coordinates.
The movement control unit controls the moving device so that the stylus comes into contact with the third point by relatively moving the stylus in a direction approaching the center coordinates from the starting point coordinates.
In the determination unit, the corner radius of the chip matches the specified corner radius based on the moving distance of the moving device between the coordinates of the third point and the starting point coordinates calculated by the coordinate calculation unit. The device for determining the corner radius of the tool according to claim 2, which determines whether or not. The movement control unit determines the first point and the second point so that the first tangential direction and the second tangential direction are orthogonal to each other, and sets the stylus to the first point and the second point. The moving device is controlled so as to be in contact with each other.
Assuming that the moving distance is L, the radius of curvature of the specified corner radius is R, and the predetermined tolerance is α.
The determination unit determines that the corner radius of the chip matches the specified corner radius when the following formula (1) is satisfied, and when the following formula (1) is not satisfied, the corner radius of the chip is the specified corner radius. The device for determining the corner radius of the tool according to claim 3, which determines that the radius does not match.
R {(√2) -1} -α <L <R {(√2) -1} + α ... (1) The discriminating device according to claim 3 or 4,
The touch sensor connected to the discriminating device and having the stylus is provided.
The stylus has a vertical surface portion and a horizontal surface portion that are in contact with the cutting edge of the tool and are orthogonal to each other, and a chamfered portion that chamfers a corner portion between the vertical surface portion and the horizontal surface portion.
The movement control unit of the discrimination device causes the vertical surface portion to come into contact with the first point, the horizontal surface portion to come into contact with the second point, and the chamfered portion to come into contact with the third point. A tool corner radius determination system that controls the equipment. The relative position between the tool and the touch sensor is changed so that the stylus of the touch sensor comes into contact with at least three points on the cutting edge of the tip of the tool that are separated from each other in the circumferential direction.
Each coordinate of the at least three points is calculated from each signal obtained by contacting the stylus with the at least three points.
A method for determining the corner radius of a tool, which calculates information for determining whether or not the corner radius of the tip is correct based on each of the calculated coordinates.

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