JP2019018313A - Tip information acquisition device and tip information acquisition method - Google Patents

Abstract

To provide a technique capable of acquiring tip information of a tool with a simple structure.SOLUTION: A tool holding tool 200 for holding a tool 300 is held to a spindle 100 which can rotate around a rotary shaft C parallel to a z axis, so that a tool holding tool reference phase S matches a spindle reference phase K. The spindle reference phase is configured so that, a direction parallel to an x axis around the rotary shaft is regulated as a rotary reference position on an x-y plane. By using a light emitter 440 and a camera 450 each of which is arranged on each of both sides of a y-axis direction sandwiching the tool, a measurement signal indicating a distance M along the x-axis direction between the tip 301 of the tool and the rotary shaft, is acquired. The measurement signal is acquired while changing a rotary angle θ from a rotary reference position. Then, a rotary angle θmax when the distance M is a maximum distance, and a maximum distance Mmax are distinguished, out of distances M, and a core height indicating a distance L between the tip of the tool and the tool holding tool reference phase, on a plane orthogonal to the rotary shaft is determined.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a technique for acquiring edge information of a tool used for cutting.

In a machine tool that performs cutting, a work is cut by bringing a cutting edge of a tool (referred to as a “cutting tool”) into contact with a work (referred to as a “workpiece”). In such a machine tool, since the cutting edge position of the tool affects the machining accuracy, it is necessary to acquire cutting edge information related to the cutting edge position of the tool.
As a cutting edge information acquisition device that acquires cutting edge information of a tool, for example, a tool presetter disclosed in Patent Document 1 is known. The tool presetter disclosed in Patent Document 1 includes a tool, a tool holder, a spindle, and a measuring device. The tool is held by a tool holder, and the tool holder is held by a spindle. Moreover, the measuring apparatus is comprised by the light emitter and light receiver which are arrange | positioned on both sides on both sides of a tool. In the measuring device, the light emitted from the light emitter is blocked by the tool and not received by the light receiver, or the light emitted from the light emitter is received by the light receiver without being blocked by the tool. A measurement signal indicating the light receiving state, that is, the light receiving state of the light receiver is output. Then, the cutting edge information of the tool is acquired based on the measurement signal output from the measuring device.

Japanese Patent Laid-Open No. 10-138093

As a machine tool, a machine tool that performs cutting while moving a workpiece with respect to a cutting edge of a tool is used. In such a machine tool, the tool is held by a tool holder, and the tool holder is further held by a spindle. The tool holder reference phase around the rotation axis is set in the tool holder.
In such a machine tool, it is necessary to acquire cutting edge information including cutting edge diameter, cutting edge height, core height, and the like. The cutting edge diameter indicates the distance (cutting edge radius) between the cutting edge of the tool and the rotation axis. The cutting edge height indicates the distance between the cutting edge of the tool and the spindle placement surface on which the tool holder is placed. The center height indicates the distance between the cutting edge of the tool and the tool holder reference phase on a plane orthogonal to the rotation axis.
Using a tool presetter, which is disclosed in Patent Document 1 and provided with a measuring device composed of a light emitter and a light receiver, it is possible to acquire blade edge information including such blade edge diameter, blade edge height, core height, and the like. Conceivable. In this case, it is necessary to change the arrangement direction of the light emitter and the light receiver between when measuring the blade edge diameter and the blade edge height and when measuring the core height. Alternatively, it is necessary to use two measuring devices having different arrangement directions of the light emitter and the light receiver. Both the method using one measuring device configured to change the arrangement direction of the light emitter and the light receiver or the method using two measuring devices having different arrangement directions of the light emitter and the attendance increase costs.
The present invention has been made in view of such a point, and an object of the present invention is to provide a technique capable of acquiring cutting edge information of a tool with a simple configuration.

The first invention relates to a cutting edge information acquisition device that acquires cutting edge information of a tool in a three-dimensional orthogonal coordinate system defined by a first axis, a second axis, and a third axis that are orthogonal to each other. The cutting edge information acquisition apparatus of the present invention is preferably configured as a tool presetter. The three-dimensional orthogonal coordinate system defined by the first axis, the second axis, and the third axis orthogonal to each other is typically a three-dimensional orthogonal coordinate system defined by the x-axis, y-axis, and z-axis that are orthogonal to each other. Corresponds. In this case, the correspondence relationship between the first axis, the second axis, and the third axis, and the x axis, the y axis, and the z axis can be set as appropriate.
The present invention provides a tool holder capable of holding a tool, a spindle capable of holding a tool holder, a spindle rotatable around a rotation axis parallel to the third axis, and a measurement signal indicating the position of the cutting edge of the tool. A measuring device for rotating the spindle, a driving device for rotating the spindle, a rotation angle detecting device for outputting a rotation angle signal indicating the rotation angle of the spindle, and a processing device for discriminating (acquiring) blade edge information.
The tool holder reference phase around the rotation axis is set in the tool holder. A spindle reference phase around the rotation axis is set for the spindle. The tool holder is held on the spindle such that the tool holder reference phase matches the spindle reference phase. Various known holding mechanisms can be used as the holding mechanism for holding the tool holder on the spindle so that the tool holder reference phase matches the spindle reference phase.
In the spindle reference phase, a predetermined direction around the rotation axis is defined as a rotation reference position on a plane extending along the first axis and the second axis, that is, on a plane orthogonal to the third axis. Preferably, on a plane extending along the first axis and the second axis, a direction extending in parallel to the first axis from the rotation axis to one side along the first axis is a spindle reference phase. Is defined as the rotation reference position around the rotation axis. By defining the rotation reference position of the spindle reference phase around the rotation axis, the rotation position of the spindle reference phase when the spindle rotates around the rotation axis can be determined as the rotation angle from the rotation reference position. . Since the tool holder is held on the spindle so that the tool holder reference phase and the spindle reference phase match, the rotation reference position of the spindle reference phase around the rotation axis is the rotation axis of the tool holder reference phase. It is also the rotation reference position around.
In the present invention, cutting edge information including at least the core height is acquired. The center height indicates the distance between the cutting edge of the tool and the tool holder reference phase on a plane orthogonal to the rotation axis.
The measuring device is composed of a light emitter and a camera. The light emitter irradiates the tool with light on one side along a first direction intersecting a predetermined direction (a direction defining a rotation reference position of a spindle reference phase) and on the other side along the first direction. Are arranged as follows. The camera is arranged on the other side of the tool along the first direction so that the light receiving surface extends along the second direction intersecting the first direction. The measuring device outputs a signal indicating a distance M along the first direction between the cutting edge of the tool and the rotating shaft as a measurement signal.
The predetermined direction, the first direction, and the second direction can be set as appropriate. Preferably, a direction parallel to the first axis is set as the predetermined direction, a direction parallel to the second axis orthogonal to the first axis is set as the first direction, and the second axis is set as the second direction. An orthogonal direction is set. In this case, the light emitter and the camera are arranged in a direction parallel to the second axis orthogonal to the first axis. The light receiving surface of the camera extends along a first axis and a third axis that are orthogonal to the second axis. The measuring device measures a distance along the first axis between the cutting edge of the tool and the rotation axis.
The rotation angle detection device outputs a signal indicating the rotation angle θ from the rotation reference position around the rotation axis of the spindle reference phase as a rotation angle signal. Preferably, a rotation angle detection device that outputs a rotation angle signal that directly indicates the rotation angle θ on one side along the circumferential direction from the rotation reference position is used. Of course, a rotation angle detection device that outputs a rotation angle signal that indirectly indicates the rotation angle θ from the rotation reference position can also be used.
The processing device determines the maximum distance Mmax among the distances M for different rotation angles θ based on the rotation angle signal output from the rotation angle detection device and the measurement signal output from the measurement device, and the distance M is the maximum. The rotation angle θmax when the distance Mmax is reached is determined. Based on the maximum distance Mmax and the rotation angle θmax, the center height indicating the distance L between the cutting edge of the tool and the tool holder reference phase on the plane orthogonal to the rotation axis is calculated (discriminated). As a calculation method (discrimination method) of the distance L, a calculation method in which the distance L is positive or negative according to the arrangement relationship between the cutting edge of the tool and the tool holder reference phase along the circumferential direction around the rotation axis. Is preferably used. In this case, it is possible to determine in which direction the cutting edge of the tool is separated along the circumferential direction with respect to the tool holder reference phase based on whether the distance L is positive or negative. The distance L can be calculated by, for example, [L = Mmax × sin (−θmax)] or [L = Mmax × sin (θmax)].
Normally, in a state where the tool is held by the tool holder, the cutting edge of the tool is in the vicinity of the tool holder reference phase (including the case where it matches the tool holder reference phase) on a plane orthogonal to the rotation axis. ). For this reason, within a predetermined rotation angle range, for example, the distance M can be measured in a predetermined rotation angle range from a state in which the spindle reference phase (tool holder reference phase) coincides with the rotation reference position. In this case, the maximum value of the distance M or the maximum value of the distance M is determined as the maximum distance Mmax. The configuration of “determining the maximum distance Mmax of the distances M” of the present invention includes an aspect of “determining the maximum value of the distances M measured within a predetermined angle range”.
In the present invention, by using a measuring device including a light emitter and a camera arranged along a direction intersecting a predetermined direction that defines a rotation reference position of a spindle reference phase (tool holder reference phase), a center height is obtained. Blade edge information including can be acquired with a simple configuration.
In another form of the first aspect of the invention, the processing device determines the cutting edge diameter based on the maximum distance Mmax. The cutting edge diameter indicates a distance (cutting edge radius) R between the cutting edge of the tool and the rotation axis.
In this embodiment, cutting edge information including a core height and a cutting edge diameter can be acquired with a simple configuration.
In another aspect of the first invention, the tool holder is placed on the spindle end surface of the spindle. In addition, the measuring apparatus measures a signal indicating a distance M along a predetermined direction between the cutting edge of the tool and the rotation axis and a distance H along the third axis between the cutting edge of the tool and the spindle end surface. Output as. And a processing apparatus discriminate | determines the blade edge | tip height based on the measurement signal output from a measuring apparatus. The cutting edge height indicates the distance H along the rotation axis between the cutting edge of the tool and the spindle end face.
In this embodiment, the cutting edge information including the core height and the cutting edge height or the core height, the cutting edge diameter and the cutting edge height can be acquired with a simple configuration.
The second invention relates to a cutting edge information acquisition method for acquiring cutting edge information of a tool in a three-dimensional orthogonal coordinate system defined by a first axis, a second axis, and a third axis orthogonal to each other. The cutting edge information acquisition method of the present invention is preferably executed using a tool presetter.
The present invention has first to fourth steps.
In the first step, the tool holder holding the tool is held (attached) to a spindle that can rotate around a rotation axis parallel to the third axis. At this time, the tool holder is held on the spindle such that the tool holder reference phase around the rotation axis of the tool holder matches the spindle reference phase around the rotation axis of the spindle.
In the spindle reference phase, a predetermined direction around the rotation axis on a plane extending along the first axis and the second axis is defined as the rotation reference position. Preferably, on a plane extending along the first axis and the second axis, a direction extending in parallel to the first axis from the rotation axis to one side along the first axis is a spindle reference phase. Is defined as the rotation reference position around the rotation axis.
When the rotation position of the spindle is set so that the spindle reference phase matches the rotation reference position, the tool holder reference phase also matches the rotation reference position.
In the second step, the spindle is rotated by the rotation angle θ around the rotation axis from the rotation reference position. In this state, the tool is disposed on one side with respect to the tool along a first direction that intersects a predetermined direction (a direction that defines the rotation reference position of the spindle around the rotation axis) and extends along the first direction. With respect to the light emitter that emits light to the other side and the tool, the light receiving surface extends along the second direction that intersects the first direction on the other side along the first direction. Using a camera, a measurement signal indicating a distance M along a predetermined direction between the cutting edge of the tool and the rotation axis is obtained. The output signal indicating the light receiving state of the light receiving element output from the camera corresponds to the measurement signal output from the measuring device.
The predetermined direction, the first direction, and the second direction can be set as appropriate. Preferably, a direction parallel to the first axis is set as the predetermined direction, a direction parallel to the second axis orthogonal to the first axis is set as the first direction, and the second axis is set as the second direction. An orthogonal direction is set. In this case, the light emitter and the camera are arranged in a direction parallel to the second axis orthogonal to the first axis. The light receiving surface of the camera extends along a first axis and a third axis that are orthogonal to the second axis. The measuring device measures a distance along the first axis between the cutting edge of the tool and the rotation axis.
In the third step, the process of the second step is executed for a plurality of different rotation angles θ including 0 degrees. That is, the distance M is measured at a plurality of different rotation angles θ including 0 degrees.
In the fourth step, the maximum distance Mmax of the distance M is determined, and the rotation angle θmax when the distance M becomes the maximum distance Mmax is determined. Based on the maximum distance Mmax and the rotation angle θmax, the center height indicating the distance L between the cutting edge of the tool and the tool holder reference phase on the plane orthogonal to the rotation axis is calculated (discriminated). As a calculation method (discrimination method) of the distance L, a calculation method in which the distance L is positive or negative according to the arrangement relationship between the cutting edge of the tool and the tool holder reference phase along the circumferential direction around the rotation axis. Is preferably used. The distance L can be calculated by, for example, [L = Mmax × sin (−θmax)] or [L = Mmax × sin (θmax)].
In the present invention, by using a measuring device including a light emitter and a camera arranged along a direction intersecting a predetermined direction that defines a rotation reference position of a spindle reference phase (tool holder reference phase), a center height is obtained. Blade edge information including can be acquired with a simple configuration.
In another form of the second invention, in the fourth step, the cutting edge diameter is determined based on the maximum distance Mmax. The cutting edge diameter indicates a distance (cutting edge radius) R between the cutting edge of the tool and the rotation axis.
In this embodiment, cutting edge information including a core height and a cutting edge diameter can be acquired with a simple configuration.
In another form of the second invention, in the first step, the tool holder is held (attached) to the spindle so that the tool holder is placed on the spindle end surface of the spindle. In the second step, measurement signals indicating a distance M along a predetermined direction between the cutting edge of the tool and the rotation axis and a distance H along the third axis between the cutting edge of the tool and the spindle end surface obtain. In the fourth step, the height of the cutting edge is determined based on the measurement signal. The cutting edge height indicates the distance along the rotation axis between the cutting edge of the tool and the spindle end face.
In this embodiment, the cutting edge information including the core height and the cutting edge height or the core height, the cutting edge diameter and the cutting edge height can be acquired with a simple configuration.

  With the cutting edge information acquisition apparatus and the cutting edge information acquisition method of the present invention, the cutting edge information of a tool can be acquired with a simple configuration.

It is a figure which shows the state in which the tool holder holding a tool is hold | maintained at the spindle. It is the figure seen from the direction (direction parallel to a y-axis) shown by the arrow II of FIG. 1, and is a figure explaining the blade-tip height. It is the figure seen from the direction (direction parallel to az axis) shown by arrow III of Drawing 1, and is a figure explaining a blade edge diameter and core height. It is a figure explaining schematic structure of the blade edge information acquisition device of the present invention. It is a figure explaining the operation | movement which acquires the blade edge | tip information in this invention. It is a figure explaining the operation | movement which acquires the blade edge | tip information in this invention. It is a figure explaining the operation | movement which acquires the blade edge | tip information in this invention. It is a figure explaining the operation | movement which acquires the blade edge | tip information in this invention. It is a block diagram of one embodiment of the blade edge information acquisition device of the present invention. The rotation angle θ (degrees) from the rotation reference position around the rotation of the spindle reference phase (tool holder reference phase) and the distance M (in the direction parallel to the x axis between the blade edge and the rotation axis) mm). It is a figure which shows the tool holder which hold | maintains a some tool.

Embodiments of the present invention will be described below with reference to the drawings.
First, the cutting edge information of the tool acquired by the cutting edge information acquisition apparatus and cutting edge information acquisition method of this invention is demonstrated with reference to FIGS. FIG. 1 shows a tool holding a tool 300 in a three-dimensional orthogonal coordinate system (hereinafter referred to as “xyz coordinate system”) defined by an x axis, a y axis, and a z axis orthogonal to each other. A state in which the holder 200 is held by the spindle 100 is shown. 2 is a view seen from the direction indicated by the arrow II in FIG. 1 (direction parallel to the y-axis), and FIG. 3 is the direction indicated by the arrow III in FIG. 1 (parallel to the z-axis). FIG.
The x-axis, y-axis, and z-axis of the three-dimensional orthogonal coordinate system correspond to the “first axis”, “second axis”, and “third axis” of the present invention, respectively. The correspondence relationship between the “first axis”, “second axis”, and “third axis” of the present invention and the x-axis, y-axis, and z-axis can be set as appropriate.

  The spindle 100 is configured to be rotatable around a rotation axis C parallel to the z axis. The spindle 100 has a spindle inner peripheral surface (not shown) that forms a tool holder insertion space into which the shank portion 210 of the tool holder 200 is inserted, and a spindle end face 101. The tool holder 200 is placed on the spindle end surface 101.

The tool holder 200 has a shank part 210, a flange part 220, and a tool holding part 230. The tool holder outer peripheral surface 240 of the tool holder 200 has first to fifth tool holder outer peripheral surface portions 241 to 245. The 1st tool holder outer peripheral surface part 241 is formed in the part corresponding to the shank part 210, and comprises a shank part outer peripheral surface. The second to fourth tool holder outer peripheral surface portions 242 to 244 are formed in portions corresponding to the flange portion 220, and the first flange portion end surface, the flange portion outer peripheral surface, and the second flange portion end surface of the flange portion 220 are respectively formed. Configure. The fifth tool holder outer peripheral surface portion 245 is formed in a portion corresponding to the tool holding portion 230 and constitutes the tool holding portion outer peripheral surface. Further, the tool holder 200 has a tool holder end face 250 along the rotation axis C on the opposite side to the shank portion 210.
A tool 300 is held on the tool holder 200. The tool 300 is preferably detachably held on the tool holder 200. The tool 300 has a cutting edge 301. In FIG. 1, the cutting edge 301 of the tool 300 protrudes from the tool holder outer peripheral surface (fifth tool holder outer peripheral surface portion) 245 and the tool holder end surface 250. When the cutting edge 301 of the tool 300 comes into contact with the workpiece processing portion, the workpiece is cut.

In the tool holder 200, a tool holder reference phase S around the rotation axis C is set. The tool holder reference phase S preferably passes in the vicinity of the blade edge 301 of the tool 300 held by the tool holder 200 (through the blade edge 301) on a plane orthogonal to the rotation axis C (see FIG. 3). (Including cases).
A spindle reference phase K around the rotation axis C is set for the spindle 100.
The tool holder 200 is held (mounted) on the spindle 100 so that the tool holder reference phase S matches the spindle reference phase K. As the holding mechanism for holding the tool holder 200 on the spindle 100 such that the tool holder reference phase S matches the spindle reference phase K, holding mechanisms having various known configurations can be used.
In the spindle reference phase K, a predetermined direction around the rotation axis C on the xy plane orthogonal to the z axis is defined as the rotation reference position. In the present embodiment, a direction extending from the rotation axis C to one side along the x axis in parallel with the x axis is defined as the rotation reference position of the spindle reference phase K. In FIG. 3, a line having an angle α0 around the rotation axis C is defined as the rotation reference position on the xy plane of the xyz coordinate system. In this embodiment, since the tool holder 200 is held by the spindle 100 so that the tool holder reference phase S matches the spindle reference phase K, the rotation reference around the rotation axis C of the spindle reference phase K is achieved. The position is also the rotation reference position around the rotation axis C of the tool holder reference phase S. That is, according to the present invention, the "spindle reference phase is defined as a rotation reference position in a predetermined direction around the rotation axis on a plane extending along the first axis and the second axis" The holder reference phase is equivalent to a configuration in which a predetermined direction around the rotation axis on the plane extending along the first axis and the second axis is defined as the rotation reference position.

  In the present embodiment, the angle detection for detecting the angle α around the rotation axis C of the spindle reference phase K so that the rotation angle θ of the spindle reference phase K from the rotation reference position can be easily discriminated. As an apparatus, the angle α0 when the spindle reference phase K coincides with the rotation reference position indicates 0 degree, and the spindle 100 moves in one direction along the circumferential direction (for example, counterclockwise as indicated by an arrow in FIG. ) Is used to output a rotation detection signal that increases with rotation. In this case, the angle α indicated by the angle detection signal output from the angle detection device indicates the rotation angle θ of the spindle reference phase K (tool holder reference phase S) from the rotation reference position.

In FIG. 2, a distance H along the z-axis (rotation axis C) between the cutting edge 301 of the tool 300 held by the tool holder 200 and the spindle end surface 101 on which the tool holder 200 is placed. Indicates “the height of the cutting edge”.
In FIG. 3, the distance R between the cutting edge 301 of the tool 300 held by the tool holder 200 and the rotation axis C indicates the “cutting edge diameter (cutting edge radius)”.
In FIG. 3, the distance L on the xy plane between the cutting edge 301 of the tool 300 held by the tool holder 200 and the tool holder reference phase S indicates the “core height”. .

  Next, the outline | summary of the operation | movement which acquires the blade edge information (blade edge diameter, blade edge height, core height) in the blade edge information acquisition apparatus and blade edge information acquisition method of this invention is demonstrated with reference to FIGS. 4 is a diagram showing a schematic configuration of the blade edge information acquiring apparatus of the present invention, and FIGS. 5 to 8 are viewed from a direction indicated by an arrow V in FIG. 4 (a direction parallel to the z axis). It is a figure explaining the blade edge information acquisition operation.

The measuring device 430 that outputs the measurement signal indicating the position of the cutting edge 301 of the tool 300 that constitutes the cutting edge information acquisition apparatus of the present embodiment includes a light emitter 440 and a camera 450. As the light emitter 440, a laser light emitter, an LED light emitter, or the like is used. The camera 450 has a light receiving surface 451 on which a light receiving element such as a CCD or CMOS is disposed.
The light emitter 440 and the camera 450 are arranged on both sides of the tool 300 along a first direction that intersects a predetermined direction that defines a rotation reference position around the rotation axis C of the spindle reference phase K. The camera 450 is arranged such that the light receiving surface 451 extends along a second direction that intersects the first direction.
In the present embodiment, the predetermined direction that defines the rotation reference position of the spindle reference phase K is a direction extending from the rotation axis C in parallel to the x axis and to one side along the x axis (in FIG. 3, an angle α0). Direction) is set. In addition, a direction parallel to the y-axis orthogonal to the x-axis is set as the first direction that intersects the predetermined direction. In addition, a direction extending along the x-axis and the z-axis orthogonal to the y-axis is set as the second direction that intersects the first direction. In other words, the light emitter 340 and the camera 350 constituting the measuring device 430 are arranged on both sides of the tool 300 along a direction parallel to the y axis perpendicular to the x axis. The camera 450 is arranged such that the light receiving surface 451 extends along the x axis and the z axis perpendicular to the y axis.

The light emitter 440 and the camera 450 are configured to be movable along the x axis and the z axis. Accordingly, an inexpensive camera having a small area of the light receiving surface 451, that is, a small number of light receiving elements can be used as the camera 450.
In the camera 450, the light receiving state of each light receiving element, that is, the state where the light emitted from the light emitter 440 is blocked by the tool 300 and is not received by the light receiving element, or the light emitted from the light emitter 440 is An output signal indicating a state in which light is received by the light receiving element without being blocked by the tool 300 is output. Based on the output signal output from the camera 450, the position of the cutting edge 301 of the tool 300 on the light receiving surface 451 of the camera 450 can be determined. In the present embodiment, since the light receiving surface 451 extends along the x axis and the z axis orthogonal to the y axis, the x axis position (x axis coordinate) of the cutting edge 301 of the tool 300 on the light receiving surface 451. And the z-axis position (z-axis coordinate) can be determined.
Then, the x-axis position and the z-axis position of the cutting edge 301 on the light-receiving surface 451 of the camera 450, and the x-axis position and the spindle end surface of the light-receiving surface 451 of the camera 450 with respect to the rotation axis C in the xyz coordinate system. Based on the z-axis position with respect to 101, the x-axis position and the z-axis position of the cutting edge 301 with respect to the rotation axis C in the xyz coordinate system can be determined.
For example, in FIG. 5, the x-axis position x1 of the light-receiving surface 451 of the camera 450 with respect to the rotation axis C in the xyz coordinate system and the x-axis position A1 of the cutting edge 301 on the light-receiving surface 451 of the camera 450. Based on this, it is possible to determine the x-axis position M (= x1 + A1) of the cutting edge 301 with respect to the rotation axis C in the xyz coordinate system. The z-axis position of the cutting edge 301 with respect to the spindle end surface 101 in the xyz coordinate system can be similarly determined.
That is, the measuring device 430 outputs a measurement signal indicating the x-axis position and the z-axis position of the cutting edge 301 of the tool 300 held by the tool holder 200. Based on the measurement signal output from the camera 450, the x-axis position with respect to the rotation axis C and the z-axis position with respect to the spindle end surface 101 of the cutting edge 301 of the tool 300 can be determined.
Note that the x-axis position of the cutting edge 301 of the tool 300 with respect to the rotation axis C indicates the distance M along the x-axis between the cutting edge 301 of the tool 300 and the rotation axis C. The z-axis position of the cutting edge 301 of the tool 300 with respect to the spindle end surface 101 indicates a distance H along the z-axis (rotation axis C) between the cutting edge 301 of the tool 300 and the spindle end surface 101.

Here, from FIG. 3 viewed from a direction parallel to the z-axis, a distance (blade diameter) R between the cutting edge 301 of the tool 300 and the rotation axis C, and a line connecting the cutting edge 301 of the tool 300 and the rotation axis C, If the angle β formed by the tool holder reference phase S (spindle reference phase K) is known, the distance between the cutting edge 301 of the tool 300 and the tool holder reference phase S on the plane orthogonal to the rotation axis C. It can be understood that the (core height) L can be calculated by [L = R × sin β].
In the cutting edge information acquisition apparatus and cutting edge information acquisition method of the present invention, the light emitting device 440 and the camera 450 arranged along the direction intersecting the predetermined direction that defines the rotation reference position around the rotation axis C of the spindle reference phase K. The measuring device 430 is used to measure the cutting edge diameter R and the angle β, and the core height L is calculated (discriminated) based on the measured cutting edge diameter R and the angle β.

As indicated by a solid line in FIG. 6, in a state where the tool holder 200 is held by the spindle 100, the cutting edge 301 of the tool 300 is in relation to the tool holder reference phase S (spindle reference phase K). The case where it arrange | positions along the circumferential direction at one direction side (counterclockwise side in FIG. 6) is demonstrated.
Note that the rotation angle detection device that detects the angle α of the spindle reference phase K around the rotation axis C indicates that the angle α0 when the spindle reference phase K coincides with the rotation reference position indicates 0 degree, and the spindle 100 It increases as it rotates in one direction along the direction, and when it reaches the rotation reference position, a rotation detection signal indicating 0 degree is output.
In the tool 300 indicated by the solid line in FIG. 6, the rotation position of the spindle 100 is set so that the spindle reference phase K (tool holder reference phase S) matches the rotation reference position (angle α0). Is shown. A tool 300 indicated by a broken line shows a state where the rotation position of the spindle 100 is set so that the cutting edge 301 of the tool 300 coincides with the rotation reference position (angle α0).

In this case, the angle β formed by the line connecting the cutting edge 301 of the tool 300 and the rotation axis C and the tool holder reference phase S is the position at which the cutting edge 301 of the tool 300 is shown by a solid line in FIG. The rotation angle θ1 of the spindle 100 from the position where the reference phase K coincides with the rotation reference position) to the position indicated by the broken line in FIG. 6 (the position where the cutting edge 301 of the tool 300 coincides with the rotation reference position) is used. It is expressed as
In a state where the spindle 100 is rotated so that the cutting edge 301 of the tool 300 coincides with the rotation reference position (a state indicated by a broken line), the spindle reference phase K exists at the position of the angle α1. That is, the rotation angle θ1 of the spindle 100 for moving the cutting edge 301 of the tool 300 from the position shown by the solid line in FIG. 6 to the position shown by the broken line in FIG. And represented by [θ1 = α1-α0].
In the present embodiment, the light emitter 440 and the camera 450 constituting the measuring device 430 are arranged in a direction parallel to the y axis perpendicular to the x axis. For this reason, the distance M along the x-axis between the cutting edge 301 of the tool 300 and the rotation axis C is maximum in a state where the cutting edge 301 of the tool 300 matches the rotation reference position (a state indicated by a broken line). It becomes the value M1. Therefore, the angle α1 is determined by measuring the angle α of the spindle reference phase K when the distance M along the x axis between the cutting edge 301 of the tool 300 and the rotation axis C is the maximum value M1. Can do.
In the present embodiment, since α0 = 0 degrees is set, the rotation angle θ1 of the spindle 100 is represented by an angle α1.
In FIG. 6, the rotation angle θ1 (= α1−α0) corresponds to “the rotation angle θ of the spindle reference phase from the rotation reference position around the rotation axis”.

Next, as indicated by a solid line in FIG. 7, in a state where the tool holder 200 is held by the spindle 100, the cutting edge 301 of the tool 300 is set to the tool holder reference phase S (spindle reference phase K). On the other hand, the case where it arrange | positions in the other direction side (clockwise side in FIG. 7) along the circumferential direction is demonstrated.
In this case, the angle β formed by the line connecting the cutting edge 301 of the tool 300 and the rotation axis C and the tool holder reference phase S is the position at which the cutting edge 301 of the tool 300 is indicated by a solid line in FIG. The rotation angle θ2 of the spindle 100 from the position where the reference phase K coincides with the rotation reference position) to the position shown by the broken line in FIG. 7 (the position where the cutting edge 301 of the tool 300 coincides with the rotation reference position) is used. It is expressed as
In a state where the spindle 100 is rotated so that the cutting edge 301 of the tool 300 coincides with the rotation reference position (a state indicated by a broken line), the spindle reference phase K exists at the position of the angle α2. That is, the rotation angle θ2 of the spindle 100 for moving the cutting edge 301 of the tool 300 from the position shown by the solid line in FIG. 7 to the position shown by the broken line in FIG. And represented by [θ2 = α2−α0].
Further, as described above, in the present embodiment, the distance M along the x-axis between the cutting edge 301 of the tool 300 and the rotation axis C is indicated by the broken line in FIG. Reaches the maximum value M2 when coincides with the rotation reference position. Therefore, the angle α2 is determined by measuring the angle α of the spindle reference phase K when the distance M along the x axis between the cutting edge 301 of the tool 300 and the rotation axis C is the maximum value M2. Can do.
In FIG. 7, the rotation angle θ2 (= α2−α0) corresponds to “the rotation angle θ of the spindle reference phase around the rotation axis from the rotation reference position”.

The distance L between the cutting edge 301 of the tool 300 and the tool holder reference phase S on the plane orthogonal to the rotation axis C, that is, the center height, is the maximum distance Mmax of the distance M, and the distance M is the maximum distance Mmax. It can be calculated (discriminated) based on the rotation angle θmax at the time.
In the present embodiment, the angle α around the rotation axis C of the spindle reference phase K (tool holder reference phase S) is 0 ° when the spindle reference phase K coincides with the rotation reference position. It is detected as an angle that increases as the spindle 100 rotates in one direction along the circumferential direction (counterclockwise in FIGS. 6 and 7). The distance L indicating the center height is when the cutting edge 301 of the tool 300 is arranged on one side along the circumferential direction with respect to the tool holder reference phase S (spindle reference phase K) (see FIG. 6). ) Is set to a positive value, and is set to a negative value when arranged on the other direction side (see FIG. 7).
Therefore, in the present embodiment, the distance L indicating the center height is calculated by [L = Mmax × sin (−θmax)].

The distance L in FIGS. 6 and 7 is shown in FIG.
In the state shown in FIG. 6, since the rotation angle θmax (= θ1) is greater than 180 degrees, sin (θmax) is a negative value. Thus, when the cutting edge 301 (1) of the tool 300 (1) is arranged as shown by the solid line in FIG. 8, it is calculated by [L = Mmax × sin (−θmax (1))]. The distance L (1) is a positive value.
On the other hand, in the state shown in FIG. 7, since the rotation angle θmax (= θ2) is 180 degrees or less, sin (θmax) is a positive value. Thus, when the cutting edge 301 (2) of the tool 300 (2) is arranged as shown by the broken line in FIG. 8, it is calculated by [L = Mmax × sin (−θmax (2))]. The distance L (2) is a negative value.
That is, the core height is determined depending on whether the cutting edge 301 of the tool 300 is arranged on the one direction side along the circumferential direction with respect to the tool holder reference phase S or on the other direction side. The sign of the indicated distance L is determined. Thereby, based on the positive / negative of the distance L which shows a core height, the correction of the cutting process according to a core height can be performed easily.

The correspondence between the positive / negative of the distance L indicating the center height and the arrangement position of the cutting edge 301 of the tool 300 along the circumferential direction with respect to the tool holder reference phase S can be set as appropriate. For example, when the cutting edge 301 of the tool 300 is arranged as shown in FIG. 6, the distance L becomes a negative value, and the cutting edge 301 of the tool 300 is arranged as shown in FIG. In addition, the distance L can be configured to be a positive value.
Further, the method for calculating the distance L indicating the center height based on the maximum distance Mmax and the rotation angle θmax is not limited to the method described above. For example, when the angle α around the rotation axis C of the spindle reference phase K (tool holder reference phase S) is an angle α0 when the spindle reference phase K coincides with the rotation reference position, the spindle 100 is When detected as an angle that increases with rotation in the other direction (clockwise in FIGS. 6 to 8) along the circumferential direction, the distance L is calculated by [L = Mmax × sin (θmax)]. You can also That is, the method for calculating the distance L includes a setting mode in which the distance L is positive or negative, and a detection mode of the angle α around the rotation axis C of the spindle reference phase K (or rotation angle θ from the rotation reference position) It can be appropriately changed according to the above.

One embodiment of the blade edge information acquiring apparatus of the present invention will be described with reference to the block diagram shown in FIG.
The blade edge information acquisition apparatus according to the present embodiment includes a processing apparatus 410, a spindle 100, a drive apparatus 420, a measurement apparatus 430, a rotation angle detection apparatus 460, and the like. The blade edge information acquisition device is preferably configured as a tool presetter.

The spindle 100 is configured to be able to hold the tool holder 200 holding the tool 300 and to be rotatable around a rotation axis C parallel to the z axis. As described above, the tool holder 200 is held on the spindle such that the tool holder reference phase S matches the spindle reference phase K. In the spindle reference phase K, a predetermined direction (direction of the angle α0) around the rotation axis C is defined as the rotation reference position. The tool holder 200 is placed on the spindle end surface 101.
The driving device 420 rotates the spindle 100 holding the tool holder 200 around the rotation axis C.
The measuring device 430 includes a light emitter 440 and a camera 450. In the present embodiment, as described above, the light emitter 440 and the camera 450 are disposed on both sides of the tool 300 along the y axis. The camera 450 is arranged such that the light receiving surface 451 extends along the x axis and the z axis orthogonal to the y axis. The measuring device 430 includes a distance M along the x-axis between the cutting edge 301 of the tool 300 held by the tool holder 200 and the rotation axis C, and between the cutting edge 301 of the tool 300 and the spindle end surface 101. , A measurement signal indicating the distance H along the z-axis is output. If the camera 450 is configured to be movable along the x-axis and the z-axis, the output signal of the camera 450 and the position of the camera 450 in the xyz coordinate system (x with respect to the rotation axis C) Based on the position signal indicating the axial position and the z-axis position with respect to the spindle end surface 101), the position of the cutting edge 301 of the tool 300 in the xyz coordinate system (the x-axis position with respect to the rotation axis C and the z-axis position with respect to the spindle end surface 101). ).
The rotation angle detection device 460 outputs a rotation angle signal indicating the rotation angle θ of the spindle reference phase K (tool holder reference phase S) around the rotation axis C from the rotation reference position (angle α0). The rotation angle signal preferably indicates 0 degree when the spindle reference phase K coincides with the rotation reference position, and indicates the rotation angle θ that increases as the spindle 100 rotates in one direction along the circumferential direction. A signal is used.
The processing device 410 includes a CPU, a storage device, and the like. The processing device 410 controls the driving device 420 and the measuring device 430, and based on the rotation angle signal output from the rotation angle detecting device 460 and the measurement signal output from the measuring device 430, the cutting edge diameter, Cutting edge information including cutting edge height and core height is determined.

A blade edge information acquisition method for acquiring blade edge information using an embodiment of the blade edge information acquisition apparatus of the present invention will be described below. In addition, the following description is also what demonstrated one Embodiment of the blade edge | tip information acquisition method of this invention.
(Step 1)
The tool holder 200 holding the tool 300 is held (mounted) on a spindle 100 that can rotate around a rotation axis C parallel to the z-axis. At this time, the tool holder 200 is held on the spindle 100 such that the tool holder reference phase S matches the spindle reference phase K.
The spindle reference phase K is parallel to the x axis from the rotation axis C in the predetermined direction around the rotation axis C on the plane (xy plane) orthogonal to the rotation axis C (z axis). In addition, a direction extending to one side along the x axis is defined as the rotation reference position.

(Step 2)
The spindle 100 (tool holder 200) is rotated about the rotation axis C from the rotation reference position by a rotation angle θ. In this state, the tool 300 is irradiated with light on one side along a first direction that intersects a predetermined direction that defines the rotation start position of the spindle reference phase K, and on the other side along the first direction. With respect to the light emitter 440 and the tool 300, the light receiving surface 451 is disposed on the other side along the first direction so as to extend along the second direction intersecting the first direction. The distance M along the predetermined direction between the cutting edge 301 and the rotation axis C of the tool 300 and the z-axis (rotation axis C) between the cutting edge 301 and the spindle end surface 101 are used. A measurement signal indicating the measured distance H is obtained.
In the present embodiment, the light is emitted to one side along the y axis perpendicular to the direction parallel to the x axis and to the other side along the y axis, which defines the rotation start position of the spindle reference phase K with respect to the tool 300. The light receiving surface 451 extends along the x-axis and the z-axis orthogonal to the y-axis on the other side along the y-axis with respect to the light emitter 440 and the tool 300 arranged to irradiate the tool 300. The distance M along the x-axis between the cutting edge 301 and the rotation axis C of the tool 300 and the z-axis (rotation axis C) between the cutting edge 301 and the spindle end face 101 using the camera 450 arranged in A measurement signal indicating the distance H along is obtained.

(Third step)
The process of the second step is executed for a plurality of different rotation angles θ including 0 degrees. That is, the distance H at a plurality of different rotation angles θ is measured.

(4th step)
Based on the measurement signal, the maximum distance (maximum value) Mmax among the distances M at each rotation angle θ and the rotation angle θmax when the distance M becomes the maximum distance Mmax are determined. Based on the maximum distance Mmax and the rotation angle θmax, the center height indicating the distance L between the cutting edge 301 of the tool 300 and the tool holder reference phase S on the plane orthogonal to the rotation axis C is determined. For example, the distance L is determined (calculated) by [L = Mmax × sin (−θmax)] or [L = Mmax × sin (θmax)].
Further, based on the maximum distance Mmax, a blade edge diameter indicating a distance (blade edge radius) R between the blade edge 301 of the tool 300 and the rotation axis C is determined.
Further, based on one of the measurement signals, the edge height indicating the distance H along the rotation axis C (z axis) between the edge 301 of the tool 300 and the spindle end surface 10 is determined.

Although the case where the blade edge information of the tool holder 200 that holds one tool 300 is acquired has been described above, the blade edge information of the tool holder that holds a plurality of tools can also be acquired.
FIG. 11 shows a tool holder 500 that holds three tools 610, 620 and 630.
Tools 610, 620, and 630 are held by tool holder 500 at appropriate intervals. For example, it is held at 120 degree intervals. Further, tool holder reference phases S610, S620, and S630 are set corresponding to the tools 610, 620, and 630, respectively. In FIG. 11, the cutting edge 611 of the tool 610 and the cutting edge 621 of the tool 620 are on one side (counterclockwise in FIG. 11) along the circumferential direction with respect to the tool holder reference phases S610 and S620. The case where the blade edge 631 of the tool 630 is disposed and is disposed on the other direction side (clockwise in FIG. 11) along the circumferential direction with respect to the tool holder reference phase S630 is shown.
When the tool 610 is used, the tool holder 500 is held on the spindle 100 such that the tool holder reference phase S610 corresponding to the tool 610 matches the spindle reference phase K. In this state, the blade edge information for the blade edge 611 of the tool 610 is acquired by the method described above. When the tool 620 or 630 is used, the tool holder 500 is set so that the tool holder reference phase S620 corresponding to the tool 620 or the tool holder reference phase S630 corresponding to the tool 630 matches the spindle reference phase K. Hold on the spindle 100.
Alternatively, with the tool holder 500 mounted on the spindle 100, the spindle 100 is set so that the tool holder reference phases S610, S620, S630 corresponding to the tools 610, 620, 630 to be used coincide with the spindle reference phase K. Rotate. In this state, the blade edge information of the blade edge of the tool to be used is acquired.

  FIG. 10 shows the relationship between the rotation angle θ of the spindle reference phase K (tool holder reference phase S) around the rotation axis C from the rotation reference position and the distance M between the cutting edge of the tool and the rotation axis C. The graph which shows is shown. In FIG. 10, the solid line indicates the relationship between the rotation angle θ and the distance M between the cutting edge 301 of the tool 300 held by the tool holder 200 and the rotation axis C (see FIG. 6). A broken line indicates a relationship between the rotation angle θ and the distance M between the cutting edges 611, 621, 631 of the tools 610, 620, 630 held by the tool holder 500 and the rotation axis C (see FIG. 11). Is shown.

As a method for determining the maximum distance Mmax from the distance M, various methods can be used.
For example, the cutting edge 301 of the tool 300 is not arranged at a position far away from the tool holder reference phase S (spindle reference phase K).
Therefore, a method of measuring distances M with respect to a plurality of rotation angles θ within a predetermined angle range with respect to the tool holder reference phase S (spindle reference phase K), and determining the maximum distance Mmax from the measured distances M. Can be used. As the predetermined angle range with respect to the tool holder reference phase S, for example, a range of 30 degrees or less in both directions with respect to the tool holder reference phase S can be set.
In addition, when the shape around the cutting edge 301 viewed from the direction parallel to the y-axis has a shape having the position of the cutting edge 301 as a maximum point, the value of the boundary at which the distance M shifts from increasing to decreasing. It is also possible to determine (maximum value) as the maximum distance Mmax.
For example, when a plurality of tools 610, 620, and 630 are held on the tool holder 500, as shown in FIG. 10, a predetermined angle with respect to the tool holder reference phases S610, S620, and S630. The maximum value or the maximum value of the distance M within the range is determined as the maximum distances Mmax610, Mmax620, and Mmax630.

The present invention is not limited to the configuration described in the detailed description, and various changes, additions, and deletions are possible.
In the embodiment, the cutting edge information acquisition device and the cutting edge information acquisition method for acquiring cutting edge information including the core height, the cutting edge diameter, and the cutting edge height have been described. However, the present invention provides at least the core height, or the cutting edge diameter and the cutting edge height. The blade edge information acquisition device and the blade edge information acquisition method can acquire at least one of them and the core height.
The x-axis direction on the xy plane orthogonal to the z-axis (rotation axis) is defined as the rotation reference position around the rotation axis of the spindle reference phase (tool holder reference phase). Any predetermined direction can be defined as the rotation reference position.
Although the direction parallel to the y-axis orthogonal to the x-axis is set as the first direction in which the light emitter and the camera (light receiver) constituting the measuring apparatus are arranged, the first direction is a predetermined direction that defines the rotation reference position. Can be set in the direction intersecting with.
Although the direction along the x-axis and z-axis orthogonal to the y-axis direction is set as the second direction in which the light receiving surface of the camera is arranged, the second direction can be set to a direction intersecting the first direction. .
A method for calculating the distance L indicating the center height based on the maximum distance Mmax determined as the maximum value (or maximum value) of the distances M and the angle θmax when the distance M becomes the maximum distance Mmax is as follows. The spindle reference phase can be appropriately selected according to the detection mode of the rotation angle θ around the rotation axis from the rotation reference position, the positive / negative setting mode of the distance L, and the like.
Each structure demonstrated by embodiment can also be used independently, and can also be used combining the some structure selected suitably.

DESCRIPTION OF SYMBOLS 100 Spindle 101 Spindle end surface 200,400 Tool holder 210 Shank part 220 Flange part 230 Tool holder 240 Tool holder outer peripheral surface 241 First tool holder outer peripheral surface part (shank part outer peripheral surface)
242 Second tool holder outer peripheral surface portion (first flange end surface)
243 Third tool holder outer peripheral surface portion (flange portion outer peripheral surface)
244 Fourth tool holder outer peripheral surface portion (end surface of second flange portion)
245 Fifth tool holder outer peripheral surface portion (tool holder outer peripheral surface)
250 Tool holder end face 300, 610, 620, 630 Tool 301, 611, 621, 631 Cutting edge 410 Processing device 420 Drive device 430 Measuring device 440 Light emitter 450 Camera (light receiver)
451 Light-receiving surface S, S610, S620, S630 Tool holder reference phase K Spindle reference phase

Claims (6)

A cutting edge information acquisition device that acquires cutting edge information of a tool in a three-dimensional orthogonal coordinate system defined by a first axis, a second axis, and a third axis orthogonal to each other,
A tool holder capable of holding a tool, a spindle capable of holding the tool holder and rotatable about a rotation axis parallel to the third axis, and a measurement signal indicating a position of a cutting edge of the tool A measuring device for outputting, a driving device for rotating the spindle, a rotation angle detecting device for outputting a rotation angle signal indicating the rotation angle of the spindle, and a processing device,
The tool holder is held on the spindle such that a tool holder reference phase around the rotation axis of the tool holder matches a spindle reference phase around the rotation axis of the spindle,
In the spindle reference phase, a predetermined direction around the rotation axis on a plane extending along the first axis and the second axis is defined as a rotation reference position.
The measuring device is disposed on one side of the tool along a first direction intersecting the predetermined direction, and emits light to the other side along the first direction. On the other hand, the camera is disposed on the other side along the first direction and has a light receiving element disposed on a light receiving surface extending along a second direction intersecting the first direction, A signal indicating a distance M along the predetermined direction between the cutting edge of the tool and the rotary shaft is output as the measurement signal;
The rotation angle detection device outputs a signal indicating the rotation angle θ around the rotation axis of the spindle reference phase from the rotation reference position as the rotation angle signal.
The processing device determines a maximum distance Mmax out of the distances M based on the rotation angle signal output from the rotation angle detection device and the measurement signal output from the measurement device, and the distance M Is determined as the maximum distance Mmax, and the cutting edge of the tool and the tool holder reference phase on the plane orthogonal to the rotation axis are determined based on the maximum distance Mmax and the rotation angle θmax. A blade edge information acquisition apparatus characterized by determining a core height indicating a distance between the blades. The cutting edge information acquisition device according to claim 1,
The processing apparatus acquires a cutting edge diameter indicating a distance between a cutting edge of the tool and the rotating shaft based on the maximum distance Mmax. The cutting edge information acquisition device according to claim 1 or 2,
The tool holder is placed on a spindle end surface of the spindle,
The measuring device calculates a distance M along the predetermined direction between the cutting edge of the tool and the rotation axis and a distance H along the third axis between the cutting edge of the tool and the spindle end surface. Output a signal indicating the measurement signal,
The processing device acquires a cutting edge height indicating a distance H along the rotation axis between the cutting edge of the tool and the spindle end surface based on the measurement signal output from the measuring apparatus. Characteristic blade edge information acquisition device. A cutting edge information acquisition method for acquiring cutting edge information of a tool in a three-dimensional orthogonal coordinate system defined by a first axis, a second axis, and a third axis orthogonal to each other,
The tool holder that holds the tool is rotated on a rotation center axis parallel to the third axis, and the tool holder reference phase of the tool holder around the rotation axis is the first axis. A predetermined direction around the rotation axis on a plane extending along one axis and the second axis is defined as a rotation reference position, so that it coincides with a spindle reference phase around the rotation axis of the spindle. A first step to hold
The spindle is disposed on one side along a first direction intersecting the predetermined direction with respect to the tool in a state where the spindle is rotated around the rotation axis by a rotation angle θ from the rotation reference position. A light emitter that emits light to the other side along the first direction, and the tool, which is disposed on the other side along the first direction, along the second direction that intersects the first direction. A second step of obtaining a measurement signal indicating a distance M along the predetermined direction between the cutting edge of the tool and the rotation shaft, using a camera in which a light receiving element is disposed on an extended light receiving surface; ,
A third step of performing the process of the second step for a plurality of different rotation angles θ including 0 °;
Based on the measurement signal, the maximum distance Mmax of the distance M is determined, the rotation angle θmax when the distance M becomes the maximum distance Mmax is determined, and the maximum distance Mmax and the rotation angle θmax are determined. A fourth step of obtaining a center height indicating a distance between the cutting edge of the tool and the tool holder reference phase on a plane orthogonal to the rotation axis,
A cutting edge information collecting method characterized by comprising: The cutting edge information acquisition method according to claim 4,
In the fourth step, the cutting edge information acquisition method is characterized in that a cutting edge diameter indicating a distance between the cutting edge of the tool and the rotation axis is acquired based on the maximum distance Mmax. The cutting edge information acquisition method according to claim 4 or 5,
In the first step, the tool holder is held on the spindle so that the tool holder is placed on a spindle end surface of the spindle,
In the second step, a distance M along the predetermined direction between the cutting edge of the tool and the rotation axis, and a distance H along the third axis between the cutting edge of the tool and the spindle end surface. Obtain a measurement signal indicating
In the fourth step, cutting edge information acquisition is characterized in that a cutting edge height indicating a distance H along the rotation axis between the cutting edge of the tool and the spindle end surface is acquired based on the measurement signal. Method.

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