JP2008073791A - Tool arrangement device and tool arrangement method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool arrangement technique for carrying out tool arrangement in high precision for a short period of time without fluctuation by a worker. <P>SOLUTION: A linear scale 4 in parallel with a Z axis 13 orthogonal with a B axis 14 is arranged against a B axis table 6 of the B axis 14 on which a grinding wheel 16 is placed, displacement dZ of a head end part in a direction of the Z axis 13 is measured by making a contact element 7 of the linear scale 4 contact with the head end part of the grinding wheel 16 every time in revolving the B axis table 6 by a specified angle, a slipping quantity ΔX and a slipping quantity ΔZ in each of directions of an X axis 11 and the Z axis 13 between a B axis rotating center 17 of the B axis table 6 and a grinding wheel head circular arc central point 9 of the head end part of the grinding wheel 16 are found by multiple regression computation, etc., and correction of the displacement of the B axis table 6 against the B axis 14 or a data in an NC program is carried out so as to correct these slipping quantity ΔX and slipping quantity ΔZ. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tool setup technique, for example, a technique effective when applied to a tool setup process or the like in a machine tool or the like that performs grinding and cutting of a rotationally symmetric curved surface.

  In general, when processing a rotationally symmetric curved surface on a work piece, a rotation mechanism that controls the posture of the tool so that the rotation axis of the work piece and a tool (for example, a grinding wheel) are always in contact with the work surface perpendicularly. Machining is performed by moving the tool relatively on the machining locus by numerical control from the tool origin using a coordinate system from the position where the rotation center axes intersect.

  In recent years, ultra-precise parts such as optical elements to be produced have been required to have higher optical shape accuracy. In the machining process of the optical element itself and the mold, the rotation axis center axis of the rotation mechanism described above is used. It has become difficult to minimize the amount of error when the tool tip is positioned at the position where the crosses.

  As a conventional technique, for example, Patent Document 1 discloses the following technique. In other words, when the cross-sectional shape of the target rotationally symmetric curved surface is given by a certain function, the machining surface shape error at a point at an arbitrary distance from the rotation axis of the workpiece is determined when the tool posture origin is set. It is expressed as a function of an error, a tool mounting error, an error when setting the tool posture origin, and a distance from the rotation axis. Then, the machining surface shape error at each measurement point obtained by the shape measurement is substituted into this function formula, and the error at the time of setting the tool origin is calculated by the multiple regression analysis method. This calculation result is input to the numerical control device, and after correcting the tool origin, the tool attachment position, and the attitude control origin, the machining is repeated to obtain the target machining surface shape.

As a tool setup method before processing, it is generally considered that a microscope is attached on the center of the rotation axis, and an observation image is enlarged and displayed by an image sensor to perform setup.
However, the above-described conventional techniques have the following technical problems.

  That is, when setting up a tool using an image sensor, for example, even if a CCD with 1 million pixels is used, a width of 2 to 3 [mu] m is produced with one pixel on the monitor, and the accuracy is higher than that. The tool setup position cannot be set. Furthermore, since the determination is finally made by human eyes, the variation in setup time and accuracy increases due to the skill level of the operator.

Moreover, in the technique of the above-mentioned patent document 1, in order to obtain a highly accurate work piece, at least by processing for measuring a processing surface shape error and actual processing reflecting the shape error. Two or more processes are required. Further, the numerical analysis method is complicated, and the unknown variable is obtained from the measurement result of the surface shape of the workpiece. However, the surface shape of the workpiece is not an ideal shape as shown in Patent Document 1. The surface shape includes a surface roughness, a shape error due to wear of the grindstone, and a misalignment between the center of rotation of the work and the center of the tool, but these disturbances are not considered. For this reason, there is a concern that the calculation result may be far from the actual value.
JP-A-5-293743

An object of the present invention is to provide a tool setup technique capable of performing tool setup with high accuracy in a short time without variation among operators.
Another object of the present invention is to provide a tool setup technique capable of performing stable and highly accurate tool setup without being affected by disturbance and without limiting the number of machining operations.

According to a first aspect of the present invention, there is provided a machine tool including: a plurality of linear motion shafts orthogonal to each other; a rotational shaft having a rotational center perpendicular to one of the linear motion shafts; and a tool supported by the rotational shaft. A tool setup device attached to a machine,
A displacement detecting means for measuring a linear displacement in a direction parallel to the linear motion axis at which the rotation axis is orthogonal;
A setup error amount of the tool reference position of the tool with respect to the center of rotation is calculated based on the rotational displacement of the rotating shaft and the linear displacement of the tool detected by the displacement detecting means along with the rotational displacement. Computing means for
A tool setup device is provided.

According to a second aspect of the present invention, there is provided a machine tool including: a plurality of linear motion shafts orthogonal to each other; a rotational shaft having a rotational center perpendicular to one of the linear motion shafts; and a tool supported by the rotational shaft. A machine tool setup method,
Detecting linear displacement of the tool in a direction parallel to the linear motion shaft when the rotational shaft is rotationally displaced to a plurality of positions;
Calculating a setup error amount of the tool reference position of the tool with respect to the rotation center based on a plurality of the rotational displacements and the linear displacement detected corresponding to each of the rotational displacements;
A tool setup method is provided.

According to the above-described present invention, for example, when a linear scale is used as the displacement detecting means, the following operation is performed as an example.
(1) Place the tool at the reference position of the rotary shaft and bring it into contact with the linear scale.

(2) The position of the linear motion axis (Z axis) orthogonal to the rotation axis and the amount of movement of the linear scale are read and used as a reference distance.
(3) The rotating shaft is rotated by a certain amount of movement, the linear scale is again brought into contact with the tool, the position of the Z-axis method and the amount of movement of the linear scale are read, and the amount of deviation from the reference distance is calculated.

(4) Repeat (3) several times.
(5) A shift amount (a setup error amount) from the tool tip and the rotation center of the rotary shaft is calculated from the rotation amount of the rotary shaft and the shift amount from the reference distance at that time.

(6) Correct the calculated shift amount.
According to the present invention, it is possible to accurately calculate a setup error amount of a tool in a state where there is no disturbance such as surface roughness of a measurement point. Since measurement of the workpiece itself is not required, machining such as trial machining is unnecessary, and there is no restriction on the number of machining times. In addition, since no operator is present, it is possible to suppress variations in required time and accuracy of tool setup due to the skill level of the operator.

As the displacement detection means, a tool sensor can be used instead of the linear scale. The detection of the contact position is the coordinate of the linear motion axis (Z axis) of the reaction position of the tool sensor.
As a method for correcting the setup error amount of the tool, for example, it is conceivable to move the tool post and move the cutting edge about the rotation axis in accordance with the setup error amount. In this case, even when the cutting edge is moved by moving the tool post, variations in accuracy and working time by the operator do not occur.

  Further, as a method for correcting the setup error amount of the tool, it is conceivable that the NC program for controlling the machining operation of the machine tool is corrected based on the setup error amount of the tool. In this case, since the tool post is not moved, it is possible to correct and process a minute movement amount that is physically difficult to move.

According to the present invention, there is no variation among workers, and tool setup can be performed with high accuracy in a short time.
Further, stable and highly accurate tool setup can be performed without being affected by disturbance and without limiting the number of machining operations.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a conceptual diagram showing an example of the configuration of a machine tool including a tool setup device that implements the tool setup method according to the first embodiment of the present invention. FIG. 2 is a top view illustrating a part of the machine tool according to the present embodiment. FIG. 3 is a perspective view illustrating a part of the machine tool according to the present embodiment.

  The machine tool 1 according to the present embodiment includes three axes, that is, an X axis 11, a Y axis 12, and a Z axis 13, as linear axes orthogonal to each other. An X-axis scale 3x, a Y-axis scale 3y, and a Z-axis scale 3z are attached to these axes in parallel with each axis. The resolution of the X-axis scale 3x, the Y-axis scale 3y, and the Z-axis scale 3z is 0.3 nm. The position of each axis can be accurately measured by the X axis scale 3x, the Y axis scale 3y, and the Z axis scale 3z.

On the end face of the Z-axis 13, a work spindle 8 that holds a workpiece material or the like (not shown) is attached.
Further, the machine tool 1 is provided with a B axis 14 which is a rotation axis having a rotation axis center (B axis rotation center 17) parallel to the Y axis 12. A B-axis encoder 10 is attached to the B-axis 14. The resolution of the B-axis encoder 10 is, for example, 0.00001 °. The B-axis encoder 10 can accurately measure the position (rotation position) of the B-axis 14 in the rotation direction.

  Further, as illustrated in FIG. 3, a B-axis table 6 is installed on the upper end surface of the B-axis 14 and operates in accordance with the operation of the B-axis 14. A tool spindle 15 is installed on the B-axis table 6 via a pedestal 18 serving as a tool post. A grinding wheel 16 is attached to the tool spindle 15. In this embodiment, the grinding wheel 16 is used as an example of a tool, but a cutting tool may be used. The grinding wheel 16 can be rotated by the rotation of the tool spindle 15.

  Each linear motion axis (X axis 11, Y axis 12, Z axis 13) and rotation axis (B axis 14) are controlled by a numerical control device (hereinafter referred to as NC device 2). You can move.

  That is, the NC device 2 includes a microprocessor 2a, a memory 2b, and the like. When the microprocessor 2a executes an NC program 2c mounted on the memory 2b from the outside, the X axis 11, the Y axis 12, and the Z axis 13. Numerical control of displacement of each axis of the B axis 14 is performed. As a result, the relative displacement between the grinding wheel 16 supported by the B-axis 14 and the workpiece (not shown) supported by the work spindle 8 of the Z-axis 13 is controlled, and the workpiece by the grinding wheel 16 in the machine tool 1 is controlled. The machining operation of the workpiece is controlled.

Further, by implementing a desired calculation program (not shown) in the memory 2b, it is possible to perform a desired numerical calculation such as a multiple regression calculation described later.
In the case of the present embodiment, the machine tool 1 is provided with a tool setup device including a linear scale 4 as displacement detection means and a calculation device 5 as calculation means.

  The linear scale 4 is attached to the end surface of the Z axis 13 in parallel with the Z axis 13. A contact 7 is attached to the end face of the linear scale 4 with the end faces parallel to the X axis 11 and the Y axis 12.

  The arithmetic unit 5 can read the values of the X-axis scale 3x, the Y-axis scale 3y, the Z-axis scale 3z, and the B-axis encoder 10. The arithmetic unit 5 can read the value of the linear scale 4. Further, the arithmetic device 5 can read the timing signal of the NC device 2.

  In addition, as described later, the arithmetic unit 5 uses, for example, multiple regression analysis based on a plurality of combinations of the rotation amount (θ) of the B-axis table 6 and the actual measurement value (dZ) by the linear scale 4 at that time. This method has a function of calculating a deviation amount ΔX and a deviation amount ΔZ (a setup error amount) described later.

  The operation of the first embodiment will be described below with reference to FIGS. 4, 5, 6, 7 and the like. FIG. 4 is a conceptual diagram illustrating the enlarged tip portion of a tool provided as the grinding wheel 16 in the machine tool 1 of the present embodiment. FIG. 5 is an explanatory diagram showing an example of geometric calculation in the tip portion of the tool. FIG. 6 is an explanatory diagram illustrating an example of a contact state between the contact 7 of the linear scale 4 and the tool according to the present embodiment. FIG. 7 is a flowchart showing an example of the operation of the tool setup method and the tool setup device of the present embodiment.

  4, 5, 6, and the like, the deviation amount ΔX between the B-axis rotation center 17 (rotation center) that is the rotation axis center of the B-axis 14 and the grindstone tip arc center point 9 (tool reference position) and The principle of calculating the deviation amount ΔZ (setup error amount) will be described.

  That is, in the present embodiment, the tip of the grinding wheel 16 has an arc shape with a radius R, and the grinding wheel tip arc center point 9 that is the center of the arc and the B-axis rotation center 17 of the B-axis table 6 are represented by X The precision of the preparatory work (tool setup) for accurately matching the axial direction and the Z-axis direction is fixed to the work spindle 8 at the tip of the grinding wheel 16 by the rotation control of the B-axis rotation center 17. This is important for accurately controlling the posture of an object.

  As illustrated in FIG. 4, it is assumed that the amount of deviation between the current B-axis rotation center 17 and the grindstone tip arc center point 9 is a distance r and an angle θ. At this point, the point that contacts the contact 7 of the linear scale 4 is set as Pl, and the point that contacts the contact 7 of the linear scale 4 by rotating the B-axis angle by Δθ is shown as P2 in FIG. 5 and FIG. As shown in FIG. 5, the following relational expression holds when the displacement amount of Pl and P2 in the Z-axis direction is dZ.

dZ = P2 (Z) -Pl (Z) (Formula 1)
dZ = r sin (θ + Δθ) −r sin (θ) (Formula 2)
Equation 2 can be transformed from the addition theorem as follows.

dZ = r sin (θ) cos (Δθ) + r sin (Δθ) cos (θ) −r sin (θ) (Formula 3)
Here, since r sin (θ) = ΔZ and r cos (θ) = ΔX,
dZ = ΔZcos (Δθ) + ΔXsin (Δθ) −ΔZ (Formula 4)
dZ = ΔZ (cos (Δθ) −1) + ΔXsin (Δθ) (Formula 5)
Holds.

  In order to calculate the deviation amount ΔZ and the deviation amount ΔX as unknown variables, the angle of the B-axis rotation center 17 is changed to change the value of Δθ, and dZ is measured at, for example, three or more points. By performing the regression calculation, the deviation amount ΔX and the deviation amount ΔZ can be calculated.

The operation of the present embodiment will be described with reference to the flowchart of FIG.
First, the tip of the grinding wheel 16 is brought into contact with the contact 7 of the linear scale 4 according to a command from the NC device 2 with the B axis 14 as a reference position (step 101).

  Based on the detection timing of the axis movement stop signal from the NC device 2, the arithmetic device 5 takes in the values of the Z-axis scale 3z and the B-axis encoder 10 and the value of the linear scale 4 (step 102). This value is used as a reference value.

In response to a command from the NC device 2, the B-axis 14 is rotated (moved) by a necessary amount, and the tip of the grinding wheel 16 is brought into contact with the contact 7 of the linear scale 4 (step 103).
The NC device 2 issues a stop signal to the arithmetic device 5 after stopping the axis movement. The arithmetic unit 5 reads the values of the Z-axis scale 3z and B-axis encoder 10 and the value of the linear scale 4 in response to the axis movement stop signal from the NC unit 2 (step 104).

The measurement operation in step 103 and step 104 is repeated by the number of necessary measurement points (step 105).
In the present embodiment, measurement is performed on the tip of the grinding wheel 16 of the linear scale 4 (contactor 7) at 10 points in the rotation direction of the B-axis 14.

That is, in the case of the present embodiment, the necessary rotation (movement) amount of the B-axis 14 starts from −43 °, is measured every Δθ = 8 °, and finally ends at + 37 °. .
The computing device 5 calculates ΔX and ΔZ from a plurality of combinations of dZ and angle θ values taken from the Z-axis scale 3z and the linear scale 4 (step 106).

If the values of ΔX and ΔZ calculated by the arithmetic unit 5 are within the allowable values (step 107), the setup is completed.
In the present embodiment, the allowable values of ΔX and ΔZ are set to 0.3 μm, for example. If the values of ΔX and ΔZ are greater than the allowable values in step 107, the tool post (pedestal 18) is moved relative to the B-axis table 6 according to the calculated values of ΔX and ΔZ, and after the correction of ΔX and ΔZ is performed (step 108), the above-described operations from Step 101 to Step 107 are performed again.

  Thus, in the case of the present embodiment, the displacement dZ of the tip of the grinding wheel 16 measured by the linear scale 4 when the B-axis table 6 is rotated, and the rotation of the B-axis table 6. In order to directly measure the deviation amount ΔZ and deviation amount ΔX of the grinding wheel tip arc center point 9 with respect to the B-axis rotation center 17 on the basis of a plurality of combinations of the positions (θ), the surface roughness of the measurement points is measured. It is possible to accurately calculate the deviation amount ΔZ and the deviation amount ΔX as the amount of setup error of the tool in a state where there is no disturbance.

  In addition, since there is no need to actually measure the workpiece itself, there is no need for trial machining for shape measurement, and there is no restriction on the number of machining operations, such as an increase in the number of machining operations. it can.

  Further, since the deviation amounts ΔX and ΔZ between the grinding wheel tip arc center point 9 and the B-axis rotation center 17 can be calculated with high accuracy without depending on the skill of the worker, the working time depending on the skill level of the worker, etc. And the variation in accuracy can be suppressed, and the grinding wheel 16 can be set up efficiently in a short time with high accuracy.

[Second Embodiment]
In the configuration of the second embodiment, the linear scale 4 having the configuration of the first embodiment described above is replaced with a tool sensor (not shown). This tool sensor has a function of sensing the tip of the grinding wheel 16. Here, the tool sensor may be either a contact type or a non-contact type as long as it has high accuracy. The error of the tool sensor in the second embodiment is 20 nm. Moreover, in this 2nd Embodiment, the calculation illustrated by each said formula is performed by the program mounted in the memory 2b inside the NC apparatus 2, without using the calculating apparatus 5. FIG.

  The difference in operation between the second embodiment and the first embodiment described above is that the NC device 2 uses the values of the Z-axis scale 3z and the B-axis encoder 10 at the time when the tool sensor detects the tool, and is calculated by the NC device 2. It is a point to do.

  Compared with the effect of the first embodiment, an accuracy error corresponding to the detection error of the tool sensor is generated. However, in addition to the effect of the first embodiment, an external arithmetic device 5 or the like is not required. There is an advantage that can be simplified.

[Third Embodiment]
The configuration of the third embodiment, which is a modification of the portion of the B-axis table 6 in the configuration of the first or second embodiment described above, will be described with reference to FIG.

FIG. 8 is a plan view showing an example of the configuration of the tool spindle 15 in the machine tool 1 according to the third embodiment.
The pedestal 18 of the tool spindle 15 installed on the B-axis table 6 has a W axis 20 for moving the grinding wheel 16 in a direction perpendicular to the pedestal 18, and the tool spindle 15 is displaced in the direction of the W axis 20. A W-axis driving piezo element 22 is provided.

Then, it is possible to move the tool spindle 15 in the direction of the W-axis 20 by operating the W-axis drive piezo element 22 installed on the pedestal 18 according to a command from the NC device 2.
The pedestal 18 of the tool spindle 15 includes a U-axis 19 that moves the grinding wheel 16 in the horizontal direction with respect to the pedestal 18, and a U-axis drive piezo element 21 that displaces the tool spindle 15 in the direction of the U-axis 19. I have.

Then, it is possible to move the tool spindle 15 in the direction of the U-axis 19 by operating the U-axis drive piezo element 21 installed on the pedestal 18 according to a command from the NC device 2.
In the third embodiment, the NC device 2 changes the W-axis drive piezo element 22 and the U-axis drive piezo element 21 according to the shift amount ΔX and the shift amount ΔZ calculated in the first or second embodiment. The shift amount is corrected by moving the tool spindle 15 (pedestal 18) in the direction of the W axis and the U axis by operating as the tool post displacing means.

  According to the third embodiment, in addition to the effects of the first and second embodiments, the operator does not intervene in the moving operation of the grinding wheel 16 by moving the tool spindle 15. Therefore, there is no variation in the accuracy and work time of the correction work of the shift amount ΔX and the shift amount ΔZ due to the above.

[Fourth embodiment]
The configuration of the machine tool 1 of the fourth embodiment is the same as that of the first or second embodiment. In the fourth embodiment, an example in which the deviation amount ΔX and the deviation amount ΔZ are corrected by changing the NC program 2c is shown.

The difference between the operation of the first embodiment and the operation of the fourth embodiment will be described with reference to FIGS. 9A and 9B. 9A and 9B are conceptual diagrams showing an example of the operation of the fourth embodiment.
After calculating the shift amounts ΔX and ΔZ, as illustrated in FIG. 9A, the shift angle θ is
θ = tan ⁻¹ (ΔX / ΔZ) (Expression 6)
The reference angle of the B-axis table 6 is corrected by the calculated θ in the NC program 2c.

Further, the correction value r of the radius R of the arc at the tool tip is
r = √ (ΔX2 + ΔZ2) (Expression 7)
9B, the radius R ′ of the arc of the corrected tool tip is calculated by R ′ = R + r, and the radius R of the tool tip set in the NC program 2c is calculated as R ′, as shown in FIG. 9B. To correct.

Then, the machining of a workpiece (not shown) mounted on the work spindle 8 is controlled using the NC program 2c corrected in this way.
In addition to the effects of the first to third embodiments described above, since the grinding wheel 16 is not moved, a fine movement amount that is physically difficult to move is also within the NC program 2c. It can be processed numerically.

  As is clear from the above description, according to the embodiment of the present invention, the position of the tool such as the grinding wheel 16 is measured with high accuracy in a form without disturbance, and the B of the grinding wheel tip arc center point 9 of the grinding wheel 16 is measured. By correcting the position of the shift amount ΔX, the shift amount ΔZ, etc. of the shaft 14 with respect to the B-axis rotation center 17, the tool setup can be stably and highly accurate without encountering an unrealistic correction result due to disturbance or the like. Can be performed. Further, there is no restriction on the number of machining operations such as an increase in the number of machining operations, and it is possible to realize efficient and highly accurate tool setup.

Furthermore, the tool setup can be performed with high accuracy in a short time without variations caused by the skill level of the operator.
Needless to say, the present invention is not limited to the configuration exemplified in the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

It is a conceptual diagram which shows an example of a structure of the machine tool containing the tool setup apparatus which implements the tool setup method which is 1st Embodiment of this invention. It is the top view which took out and illustrated a part of machine tool containing the tool setup device which implements the tool setup method which is one embodiment of this invention. It is the perspective view which took out and illustrated a part of machine tool including the tool setup device which implements the tool setup method which is one embodiment of this invention. It is the conceptual diagram which expanded and illustrated the front-end | tip part of the tool with which the machine tool containing the tool setup apparatus which implements the tool setup method which is one embodiment of this invention was equipped. It is explanatory drawing which shows an example of the geometric calculation in the front-end | tip part of a tool. It is explanatory drawing explaining an example of the contact state of the contact of the linear scale of the tool setup apparatus which implements the tool setup method which is one embodiment of this invention, and a tool. It is a flowchart which shows an example of operation | movement of the tool setup method and tool setup apparatus which are one embodiment of this invention. It is a top view which shows an example of a structure of the tool spindle in the machine tool containing the tool setup apparatus which implements the tool setup method which is 3rd Embodiment of this invention. It is a conceptual diagram which shows an example of an effect | action of 4th Embodiment of this invention. It is a conceptual diagram which shows an example of an effect | action of 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Machine tool 2 NC apparatus 2a Microprocessor 2b Memory 2c NC program 3x X-axis scale 3y Y-axis scale 3z Z-axis scale 4 Linear scale 5 Calculation apparatus (calculation means)
6 B-axis table 7 Contact 8 Work spindle 9 Grinding wheel tip arc center point (tool reference position)
10 B-axis encoder 11 X-axis 12 Y-axis 13 Z-axis 14 B-axis 15 Tool spindle 16 Grinding wheel 17 B-axis rotation center (rotation center)
18 Pedestal 19 U-axis 20 W-axis 21 U-axis drive piezo element 22 W-axis drive piezo element R Radius ΔX displacement amount of the grinding wheel 16 (setting error amount)
ΔZ deviation amount (setup error amount)

Claims (8)

A tool setup device attached to a machine tool including a plurality of linear motion shafts orthogonal to each other, a rotational shaft having a rotational center perpendicular to one of the linear motion shafts, and a tool supported by the rotational shaft. And
A displacement detecting means for measuring a linear displacement in a direction parallel to the linear motion axis at which the rotation axis is orthogonal;
A setup error amount of the tool reference position of the tool with respect to the center of rotation is calculated based on the rotational displacement of the rotating shaft and the linear displacement of the tool detected by the displacement detecting means along with the rotational displacement. Computing means for
A tool setup device comprising: In the tool setup device according to claim 1,
The tool detection device according to claim 1, wherein the displacement detection means is a linear scale that is installed in parallel with the linear motion shaft having the rotation axis orthogonal thereto and abuts against the tool. In the tool setup device according to claim 1,
The tool setup device, wherein the displacement detection means is a tool sensor that is installed in parallel with the linear motion shaft having the rotation axis orthogonal thereto and detects the displacement of the tool in the direction of the linear motion shaft. In the tool setup device according to claim 1,
A tool setup device, comprising: a tool rest displacement means which is installed on the rotating shaft via a tool rest and displaces the tool rest so as to correct the amount of setup error. In the tool setup device according to claim 1,
The tool setup device, wherein the setup error amount is corrected by an NC program for machining control of the machine tool for controlling a relative locus of the tool. A tool setup method for a machine tool comprising a plurality of linear motion axes orthogonal to each other, a rotational shaft having a rotational center perpendicular to one of the linear motion shafts, and a tool supported by the rotational shaft,
Detecting linear displacement of the tool in a direction parallel to the linear motion shaft when the rotational shaft is rotationally displaced to a plurality of positions;
Calculating a setup error amount of the tool reference position of the tool with respect to the rotation center based on a plurality of the rotational displacements and the linear displacement detected corresponding to each of the rotational displacements;
A tool setup method comprising: The tool setup method according to claim 6, wherein
The tool setup method further includes a step of correcting an attachment position of the tool with respect to the rotating shaft based on the setup error amount. The tool setup method according to claim 6, wherein
The tool setup method further includes the step of numerically correcting the setup error amount within an NC program for machining control of the machine tool for controlling a relative trajectory of the tool.