JP4879225B2 - Machine tool and displacement correction method in machine tool - Google Patents

Description

The present invention relates to a machine tool and a displacement correction method for a machine tool, and more particularly to a machine tool for correcting a displacement of a tool and a displacement correction method for a machine tool.

In recent years, machining of workpieces with machine tools is often required to perform machining with ultra-high accuracy on the order of μm. However, thermal displacement of a machine tool caused by temperature changes in the surrounding environment (hereinafter referred to simply as displacement). ) Often exceeds the μm order, and it is impossible to realize ultra-high precision machining without suppressing this displacement.

For this reason, conventionally, temperature data at appropriate positions on the machine tool and tool displacement data, which are factor data affecting the displacement, are detected, and an arithmetic expression indicating the correlation between the temperature data and the tool displacement data is generated. Attempts have been made to correct the displacement of the cutting tool. For example, Patent Document 1 discloses such a displacement correction method for a machine tool.

JP 2008-030127 A

By the way, as shown in FIG. 10, when cutting a workpiece by attaching a tool 104 to a rotating shaft 103 rotatably supported in a housing 101 via a bearing 102, temperature data at an appropriate position of the machine tool 100. It is necessary to correct the displacement of the tool 104 by generating an arithmetic expression using the factor data as the factor data, and also the displacement due to the frictional heat between the rotating shaft 103 and the bearing 102 inside the housing 101 or the rotational centrifugal force of the rotating shaft 103. Greatly affects the displacement of the tool 104, it is necessary to further consider some factor data that affects the displacement of the tool 104 with respect to the rotating shaft 103.

For example, it is conceivable to obtain temperature data of the rotating shaft 103 itself as factor data relating to the rotating shaft 103. However, for example, it is difficult to detect the temperature of the rotating shaft 103 with a contact-type temperature detector. Conventionally, the displacement of the tool 104 has been corrected without taking into account any factor data relating to the rotating shaft 103.

However, as described above, in recent years, there are many cases where ultra-high precision machining on the order of μm is required. Thus, in recent years, when the displacement of the tool 104 is corrected without considering any factor data regarding the rotating shaft 103, The high processing accuracy requirement cannot be satisfied.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a machine tool capable of accurately correcting the displacement of a tool and a displacement correction method in the machine tool.

In order to achieve the above object, the invention according to claim 1 relating to a machine tool relates to a correlation between displacement data of a tool attached to a rotary shaft and machining a workpiece and predetermined factor data affecting the displacement of the tool. in seeking the displacement amount of the tool on the basis of a machine tool for performing displacement correction of the tool, a detector for detecting a displacement amount data of rotational speed data and the rotational axis of the rotary shaft, to a predetermined factor data, detector a displacement calculating equation generating means for obtaining the arithmetic expression for performing displacement correction of the tool showing the correlation including the displacement amount data beauty rotation shaft Oyo rotational speed data of the rotary shaft detected by the displacement amount Displacement amount calculating means for calculating the amount of displacement of the tool based on the expression obtained by the operation expression generating means, the rotational speed data of the rotating shaft detected by the detector, and the displacement amount data of the rotating shaft, and the displacement amount calculating means Calculated by A displacement correcting means for performing displacement correction of the tool based on the displacement amount of the tool was, and having a.

According to the present invention, the factor data affecting the displacement of the tool, so it was decided to obtain the equations of the operations for performing the displacement correction of the tool, including the displacement of data of rotational speed data and the rotational axis of the rotary shaft Even when the displacement occurs due to frictional heat or rotational centrifugal force when the rotating shaft rotates, the displacement of the tool can be corrected with high accuracy.

According to a second aspect of the present invention related to a machine tool, the amount of displacement of the tool is based on the correlation between the amount of displacement data of a tool attached to the rotary shaft and machining the workpiece and predetermined factor data that affects the displacement of the tool. A machine tool that corrects the displacement of the tool by obtaining temperature data at an appropriate position of the machine tool, rotational speed data of the rotary shaft, displacement data of the rotary shaft, and displacement data of the tool, and a predetermined the factor data, together with the inclusion of position of the temperature data of the machine tool, further including a displacement amount data of rotational speed data and rotation axis of the rotating shaft detected by the detector, a displacement amount data of the tool Displacement calculation expression generating means for obtaining a calculation expression for performing the displacement correction of the tool showing the correlation with the predetermined factor data by multivariate analysis, the calculation expression obtained by the displacement calculation expression generating means and the detector According A displacement calculating means for calculating a displacement amount of the tool based on the displacement amount data of rotational speed data and the rotational axis of the detected rotation axis, of the tool based on the displacement amount of the tool calculated by the displacement calculating means Displacement correction means for performing displacement correction.

According to the present invention, the factor data affecting the displacement of the tool, with inclusion of place of the temperature data in the machine tool, further including a displacement amount data of rotational speed data and the rotational axis of the rotating shaft tool displacement correction Therefore, even when displacement occurs due to frictional heat or rotational centrifugal force when the rotating shaft rotates, the displacement of the tool can be corrected with high accuracy.

According to a third aspect of the present invention relating to a displacement correction method in a machine tool, the displacement amount data of a tool that is attached to a rotary shaft and processes a workpiece, and predetermined factor data that affects the displacement of the tool are correlated with each other. In a displacement correction method for a machine tool that calculates a displacement amount of a tool and corrects the displacement of the tool, a step of detecting rotational speed data of the rotating shaft and a displacement amount data of the rotating shaft, and a step of detecting the displacement amount data of the tool When, wherein the a predetermined factor data, and wherein the inclusion of displacement data beauty rotation shaft Oyo rotational speed data of the detected rotational shaft.

According to the present invention, the factor data affecting the displacement of the tool, so it was decided to perform the displacement correction of the tool, including the displacement of data of rotational speed data and the rotational axis of the rotary shaft, the rotation shaft rotates Even when displacement occurs due to frictional heat or rotational centrifugal force, the displacement of the tool can be corrected with high accuracy.

According to a fourth aspect of the present invention, there is provided a displacement correction method for a machine tool, based on a correlation between displacement data of a tool attached to a rotary shaft and machining a workpiece and predetermined factor data affecting the displacement of the tool. in the displacement correction method for a machine tool seeking displacement of the tool performing the displacement correction of the tool, detecting the position of the temperature data of the machine tool, the displacement data of the rotational speed data and the rotational axis of the rotary shaft detecting, detecting a displacement amount data of the tool, a predetermined factor data, together with the inclusion of position of the temperature data of the machine tool, the rotary shaft that is further detected rotational speed data Oyo beauty rotating shaft including the amount of displacement data it was detected obtaining a correlation between the displacement amount data and a predetermined factor data of the tool as a calculation formula by multivariate analysis, the resulting arithmetic expression A step of computing a displacement of the tool based on the displacement amount data of rotational speed data and the rotational axis of the rotating shaft and performing a displacement correction of the tool based on the displacement amount of the computed tool, to have a Features.

According to the present invention, the factor data affecting the displacement of the tool, with inclusion of place of the temperature data in the machine tool, further including a displacement amount data of rotational speed data and the rotational axis of the rotating shaft tool displacement correction Therefore, even when displacement occurs due to frictional heat or rotational centrifugal force when the rotating shaft rotates, the displacement of the tool can be corrected with high accuracy.

According to the present invention, the displacement of the tool can be corrected with high accuracy.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of a machine tool according to an embodiment of the present invention. In the following description, the left-right direction as viewed from the front side of the machine tool 1 is described as the X-axis direction, the front-rear direction is the Y-axis direction, and the up-down direction is the Z-axis direction.

An outline of the machine tool will be described with reference to FIG. 1. A machine tool 1 includes a bed 2 that forms the base of the machine tool 1, a column 3 that stands from the upper surface of the rear part of the bed 2, and an X that is provided on the upper surface of the column 3. The saddle 4 including the shaft driving mechanism 20x, the processing head 5 provided on the front surface of the saddle 4, and the quill 6 provided inside the processing head 5 and including the Z-axis driving mechanism 20z so as to be able to protrude from the lower end of the processing head 5. And a spindle unit 7 mounted on the quill 6 and a work table 8 including a Y-axis drive mechanism 20y provided on the front surface of the bed 2 and driving the drive mechanism 20 of each axis. The workpiece W is cut while appropriately changing the relative positional relationship between the tool 9 mounted on the spindle unit 7 and the workpiece W placed on the work table 8 by appropriately controlling the amount.

That is, as shown in FIG. 2 showing the peripheral structure of the spindle unit 7, the spindle unit 7 has a rotary shaft 12 that is rotatably supported in the housing 10 via a bearing 11 and the like. A tool 9 is attached to the lower end of the workpiece W via a tool holder 13, and the workpiece W is cut while the rotating shaft 12 is rotated as required by the spindle motor 14.

As shown in FIG. 2, the machine tool 1 also includes temperature data at an appropriate place of the machine tool 1 as a detector for detecting factor data or the like that affects the displacement of the tool 9 to correct the displacement of the tool 9. Temperature data detectors 15a to 15d to be detected are provided, and a predetermined rotation speed data detector 17 and displacement amount data detectors 16a and 16b are provided. In the following, the case where the displacement correction of the tool 9 in the Z-axis direction is performed will be described.

The temperature data detectors 15a to 15d are provided on the bed 2 and also on the periphery of the rotary shaft such as the quill 6, the housing 10, and the spacer 6a provided between the housing 10 and the quill 6. For the temperature data detectors 15a to 15d, for example, contact type thermocouples are employed.

The rotational speed data detector 17 has a function of detecting rotational speed data of the rotary shaft 12. More specifically, an encoder that detects the rotational speed of the spindle motor 14 functions as the rotational speed data detector 17. .
The displacement amount data detector 16 includes a rotary shaft displacement amount data detector 16a and a tool displacement amount data detector 16b.

In other words, the rotation axis displacement amount data detector 16a is provided on the inner lower side of the housing 10 (near the lower end of the rotation shaft 12). The displacement amount data of the rotating shaft 12 in the Z-axis direction can be detected via the detection seat 12a provided in the vicinity of the bearing 11 on the lower side.

The tool displacement amount data detector 16b is mounted on the work table 8 via a support member 8a, and the tool displacement amount data detector 16b can detect displacement amount data of the tool 9 in the Z-axis direction. This tool displacement amount data detector 16b is attached only when generating an arithmetic expression for the displacement amount of the tool 9 as will be described later, and is removed from the work table 8 together with the support member 8a when cutting the workpiece W. . The displacement amount data of the tool 9 is detected by attaching a test bar simulating the tool 9 to the tool holder 13 instead of the tool 9.

For example, non-contact type eddy current type displacement sensors are employed for the displacement amount data detectors 16a and 16b. More specifically, the displacement amount data detected by the displacement amount data detectors 16a and 16b is the position of the rotary shaft 12 and the tool 9 in the Z-axis direction at a predetermined reference temperature and when the rotational speed of the rotary shaft 12 is 0 ( Hereinafter, the amount of displacement with respect to the position in the Z-axis direction as a reference position is shown.

Here, in the present embodiment, when the displacement correction of the tool 9 is performed, the temperature data at an appropriate position of the machine tool 1 is included in the factor data that affects the displacement of the tool 9, and the rotation speed data of the rotating shaft 12 and The displacement amount data of the rotating shaft 12 is included. The reason for further including the rotational speed data of the rotating shaft 12 and the displacement amount data of the rotating shaft 12 is as follows.

That is, as shown in FIG. 3, when the rotating shaft 12 rotates, displacement occurs due to frictional heat with the bearing 11 (FIG. 3A), and further displacement also occurs due to rotational centrifugal force (FIG. 3 ( b)) and the like, the displacement is caused by the frictional heat and the rotational centrifugal force. However, it is considered that the rotational speed of the rotating shaft 12 greatly affects any of these displacements.

Therefore, the present inventors corrected the displacement by including the rotational speed data of the rotary shaft 12 in the factor data that affects the displacement of the tool 9, and as shown in FIG. As a result, it was confirmed that the amount of displacement was greatly reduced with respect to the displacement correction using only the factor data, and the rotational speed data of the rotary shaft 12 was included in the factor data.

Furthermore, as shown in FIG. 4, when the rotational speed of the rotary shaft 12 is suddenly changed at the time of starting the machine tool 1 or the like, the above-described complex displacement of the rotary shaft 12 changes more complicatedly. Where a predetermined time is required until the displacement is stabilized, the present inventors include the displacement amount data itself of the rotating shaft 12 that changes in a complicated manner in the factor data, thereby reducing the time required for the displacement to become stable. In order to confirm this, it was decided to include the displacement amount data of the rotating shaft 12 in the factor data. By including the displacement amount data of the rotating shaft 12 in the factor data, the variation of the displacement amount is reduced and the accuracy of displacement correction is improved.

The machine tool 1 is provided with a displacement calculation formula generation device 30 and an NC control device 40. The displacement calculation formula generation device 30 corrects the displacement of the tool 9 based on the above-described factor data and displacement amount data of the tool 9. The NC control device 40 has a function of correcting the displacement of the tool 9 in the cutting of the workpiece W based on the calculation formula obtained by the displacement amount calculation formula generating device 30. is doing.

As shown in FIG. 5, the displacement calculation formula generation apparatus 30 includes a first input unit 31, a first processing unit 32, and a first storage unit 33.
The first input means 31 is constituted by, for example, a keyboard, a mouse, a touch panel or the like, and information necessary for required processing in the first processing means 32 is input from the first input means 31.

The first processing unit 32 functions as a displacement calculation formula generation unit 32a so as to generate the calculation formula described above while acquiring necessary detection data based on information input from the first input unit 31.

That is, the factor data detected by each detector described above and the displacement data of the tool 9 are input to the displacement calculation formula generation unit 32a. Based on the input factor data and the displacement data of the tool 9, a large amount is calculated. It has a function of generating an arithmetic expression for correcting the displacement of the tool 9 by variable analysis. The multivariate analysis is an analysis method for obtaining a correlation expression between a variable (object variable) and a variable (explanatory variable) that affects the variable, and particularly refers to a case where there are two or more explanatory variables. In the present embodiment, the objective variable is the displacement amount of the tool 9, and the explanatory variable is the factor data, that is, the temperature at an appropriate position of the machine tool 1, the rotation speed of the rotary shaft 12, and the displacement amount of the rotary shaft 12.

The calculation formula generated by the displacement calculation formula generation unit 32a is shown as the following formula 1, and the constant I and the correction coefficient are obtained by performing multivariate analysis based on the detected factor data and the displacement data of the tool 9. C1 to C6 can be obtained. When the detection data is input from each detector in the displacement amount calculation expression generation unit 32a, the detection data is converted from an analog signal to a digital signal as necessary. The first processing means 32 has its function performed by the CPU.

[Equation 1]
Z = I + C1 * T1 + C2 * T2 + C3 * T3 + C4 * T4 + C5 * N
+ C6 × d
here,
Z: Displacement amount T of the tool 9 T1 temperature of the quill 6 T2 temperature of the spacer 6 a T3: temperature of the housing 10 T4 temperature of the bed 2 N: rotation speed of the rotary shaft 12 d: displacement amount I of the rotary shaft 12 I: constant C1 to C6: Correction coefficients

The 1st memory | storage means 33 is comprised by memory, a hard disk, etc., and memorize | stores the program etc. for performing multivariate analysis. The factor data detected by each detector and the displacement amount data of the tool 9 are temporarily stored in the storage means 33, and the factor data and the like stored when the arithmetic expression is generated are used as the displacement amount arithmetic expression generation unit 32a. May be read out.

As shown in FIG. 6, the NC control device 40 includes second input means 41, second processing means 42, and second storage means 43.
The second input unit 41 is configured by, for example, a keyboard, a mouse, a touch panel, or the like, and information necessary for required processing in the second processing unit 42 is input from the second input unit 41.

The second processing means 42 serves as a displacement amount calculation unit 42a and a displacement correction unit 42b so as to correct the displacement of the tool 9 while acquiring detection data by each detector based on the information input from the second input means 41. Function.

That is, factor data detected by each of the detectors described above during cutting of the workpiece W is input to the displacement amount calculation unit 42a, and the input factor data and the displacement amount calculation formula generation unit 32a generate the factor data. It has a function of calculating the displacement amount of the tool 9 based on an arithmetic expression such as Equation 1. When the detection data is input in the displacement amount calculation unit 42a, the detection data is converted from an analog signal to a digital signal as required.

The displacement correction unit 42b outputs a required control signal to correct the position of the tool 9 in the Z-axis direction based on the displacement amount of the tool 9 calculated by the displacement amount calculation unit 42a, and drives the Z-axis drive mechanism 20z. It has a function to control the amount. The second processing means 42 has its function performed by the CPU.

The second storage unit 43 includes a memory, a hard disk, and the like, and stores an arithmetic expression for performing displacement correction of the tool 9 generated by the displacement amount arithmetic expression generation device 30.

Next, a method of generating an arithmetic expression necessary for the displacement correction of the tool 9 by the displacement amount arithmetic expression generating device 30 will be described based on the flowchart of FIG.
That is, first, in step S10, the tool displacement amount data detector 16b is attached to the work table 8 via the support member 8a, and the test bar is attached to the tool holder 13, and the operator inputs the first input of the displacement amount expression generator 30. Necessary information is input from the means 31 and detection of factor data and displacement amount data of the tool 9 is started. The detection of the factor data and the displacement amount data of the tool 9 is performed, for example, while changing the rotation speed of the rotary shaft 12 in a range of ⁰ to 40000 min ⁻¹ , and the process and the rotation speed changing the rotation speed. The temperature data, the rotation speed data, and the displacement amount data are detected in any of the constant holding states.

Next, in step S20, the displacement calculation formula generation unit 32a performs multivariate analysis on the basis of the factor data detected while reading the program for performing multivariate analysis from the first storage means 33 in step S10. An arithmetic expression is generated using the displacement data as the objective variable and the factor data as the explanatory variable. This arithmetic expression is represented by the following formula 2, for example. The generated displacement amount calculation formula is stored in the second storage means 43 of the NC control device 40.

[Equation 2]
Z = −451.1 + 8.77752 × T1 + 17.5846 × T2
+ 5.5711 × T3-10.8275 × T4 + 0.03801 × N
+ 0.7736 × d

Next, a method for correcting the displacement of the tool 9 by the NC control device 40 will be described based on the flowchart of FIG.
That is, first, in step S30, the support member 8a on the work table 8, the tool displacement amount data detector 16b, and the test bar of the tool holder 13 are removed, and then the work W is placed on the work table 8 and the tool holder. A tool 9 is attached to 13. Then, the operator inputs necessary information from the second input means 41 and starts cutting the workpiece W, and in parallel with the start of the cutting, detection of factor data is started by each detector.

Next, in step S40, the displacement amount calculation unit 42a reads the arithmetic expression shown in the equation 2 stored in the second storage unit 43 in the above-described step S20, and based on the equation 2 and the factor data detected in step S30. The displacement amount of the tool 9 is calculated.

Subsequently, in step S50, the displacement correction unit 42b outputs a required control signal based on the displacement amount of the tool 9 calculated in step S40, and controls the drive amount of the Z-axis drive mechanism 20z to control the Z axis of the tool 9. Correct the position. The displacement correction of the tool 9 is performed while detecting the temperature data, the rotation speed data, and the displacement amount data in both the process of changing the rotation speed and the state where the rotation speed is kept constant.

As described above, in the present embodiment, the temperature data at an appropriate place in the machine tool 1 is included in the factor data that affects the displacement of the tool 9, and the rotational speed data of the rotary shaft 12 and the displacement amount of the rotary shaft 12 are further included. Since the calculation formula for correcting the displacement of the tool 9 including the data is generated, even if the displacement is caused by frictional heat or rotational centrifugal force when the rotating shaft 12 rotates, the tool is accurately obtained. 9 can be corrected, and the time required for the displacement to stabilize when the rotational speed of the rotating shaft 12 changes can be shortened.

In addition, this invention is not limited to embodiment mentioned above, Of course, various application implementation or deformation | transformation implementation is possible as needed. For example, in the above-described embodiment, both the rotational speed data and the displacement amount data of the rotary shaft 12 are further included as factor data. However, the rotational speed data of the rotary shaft 12 and the temperature data at a proper position of the machine tool 1 are included. Only one of the displacement amount data may be included. Even in this case, the displacement correction of the tool 9 can be performed with high accuracy compared to the case where no factor data related to the conventional rotary shaft 12 is included.

Further, in the above-described embodiment, the temperature data at an appropriate place of the machine tool 1 as the factor data is set as the temperature data of the quill 6, the spacer 6a, the housing 10, and the bed 2. As described above, the displacement of the tool 9 may be corrected by generating an arithmetic expression including the temperature in the column 3 (T7 in Equation 3), the temperature in the processing chamber (T8 in Equation 3), and the temperature in other locations. .

[Equation 3]
Z = I + C1 * T1 + C2 * T2 + C3 * T3 + C4 * T4 + C5 * N
+ C6 × d + C7 × T7 + C8 × T8 +... + CnTn

Furthermore, although the rotational speed N of the rotating shaft 12 as factor data is only a first power term in the arithmetic expression, a square term of the rotational speed N may be further included as shown in Equation 4.
[Equation 4]
Z = I + C1 * T1 + C2 * T2 + C3 * T3 + C4 * T4 + C5 * N
+ C6 × d + C7 × N ²

Further, in the above-described embodiment, the case where the displacement correction in the Z-axis direction of the tool 9 is performed has been described. However, the machine tool is also included in the factor data for the X-axis direction and the Y-axis direction of the tool 9. In addition to the temperature data of one appropriate place, at least one of the rotational speed data of the rotating shaft 12 and the displacement amount data of the rotating shaft 12 (more specifically, displacement amount data in the X-axis direction or Y-axis direction) Thus, the displacement correction may be performed while generating a required arithmetic expression.

Furthermore, in the embodiment described above, the rotational speed data of the rotary shaft 12 is detected data by the rotational speed data detector 17, but the rotational speed command of the spindle motor 14 that is output as required from the NC control device 30. A value may be used.

The present invention is useful when correcting displacement of a tool in a machine tool.

It is a lineblock diagram showing the outline of the whole machine tool composition concerning an embodiment of the present invention. It is a side view including a partial cross-sectional view showing details of the peripheral structure of the spindle unit and detection positions of each detector. FIG. 4 is a diagram showing a state in which the rotating shaft is displaced, (a) is a diagram showing a state in which the rotating shaft is displaced by frictional heat, and (b) is a state in which the displacement due to rotational centrifugal force is further generated in the rotating shaft. FIG. It is a figure for demonstrating the state which the displacement of the tool improved by including the rotation speed data and displacement amount data of a rotating shaft in factor data. It is a block diagram which shows the structure of a displacement amount calculating formula production | generation apparatus. It is a block diagram which shows the structure of NC control apparatus. It is a flowchart for demonstrating the production | generation method of the computing equation for performing the displacement correction of the tool by a displacement amount computing equation generation apparatus. It is a flowchart for demonstrating the displacement correction method of the tool by NC control apparatus. It is a side view including the partial cross section which shows the temperature detection position which concerns on the modification of this invention. It is a side view including the partial cross section which shows the detail of the periphery structure of the conventional spindle unit.

Explanation of symbols

W: Work 1: Machine tool 2: Bed 3: Column 4: Saddle 5: Processing head 6: Quill 7: Spindle unit 8: Work table 8a: Support member 9: Tool 10: Housing 11: Bearing 12: Rotating shaft 13: Tool holder 14: Spindle motor 15a: Temperature detector (for bed)
15b: Temperature detector (for quill)
15c: Temperature detector (for housing)
15d: Temperature detector (for spacer)
15e: Temperature detector (for column)
15f: Temperature detector (for processing chamber)
16a: Rotating shaft displacement amount data detector 16b: Tool displacement amount data detector 17: Rotational speed data detector (encoder)
20: Drive mechanism 20x of each axis: X-axis drive mechanism 20y: Y-axis drive mechanism 20z: Z-axis drive mechanism 30: Displacement amount calculation formula generator 31: First input means 32: First processing means 32a: Displacement amount calculation Expression generator 33: first storage means 40: NC control device 41: second input means 42: second processing means 42a: displacement amount calculation part 42b: displacement correction part 43: second storage means 100: machine tool 101: housing 102: Bearing 103: Rotating shaft 104: Tool

Claims (4)

A tool for correcting the displacement of the tool by obtaining the displacement amount of the tool based on the correlation between the displacement amount data of the tool attached to the rotary shaft and machining the workpiece and the predetermined factor data affecting the displacement of the tool. In the machine
A detector for detecting rotational speed data of the rotary shaft and displacement amount data of the rotary shaft;
Wherein the predetermined factor data, said detector arithmetic expression for performing displacement correction of the tool shown the correlation including the displacement data of the rotational speed data and Rotation axis of the rotating shaft detected by Displacement amount calculation formula generating means for obtaining
Displacement amount calculation means for calculating the displacement amount of the tool based on the calculation formula obtained by the displacement amount calculation expression generating means, the rotational speed data of the rotating shaft detected by the detector, and the displacement amount data of the rotating shaft ; ,
Displacement correction means for correcting the displacement of the tool based on the displacement amount of the tool calculated by the displacement amount calculation means;
A machine tool characterized by comprising: A tool for correcting the displacement of the tool by obtaining the displacement amount of the tool based on the correlation between the displacement amount data of the tool attached to the rotary shaft and machining the workpiece and the predetermined factor data affecting the displacement of the tool. In the machine
A detector for detecting temperature data at a proper position of the machine tool, rotation speed data of the rotary shaft, displacement amount data of the rotary shaft, and displacement data of the tool;
Wherein the predetermined factor data, wherein with inclusion of place of the temperature data of the machine tool, and further including a displacement amount data of rotational speed data and Rotation axis of the rotating shaft detected by said detector, said tool Displacement amount calculation expression generating means for obtaining a calculation expression for performing displacement correction of the tool showing a correlation between the displacement amount data of the tool and the predetermined factor data by multivariate analysis;
Displacement amount calculation means for calculating the displacement amount of the tool based on the calculation formula obtained by the displacement amount calculation expression generating means, the rotational speed data of the rotating shaft detected by the detector, and the displacement amount data of the rotating shaft ; ,
Displacement correction means for correcting the displacement of the tool based on the displacement amount of the tool calculated by the displacement amount calculation means;
A machine tool characterized by comprising: A tool for correcting the displacement of the tool by obtaining the displacement amount of the tool based on the correlation between the displacement amount data of the tool attached to the rotary shaft and machining the workpiece and the predetermined factor data affecting the displacement of the tool. In a displacement correction method in a machine,
Detecting rotational speed data of the rotating shaft and displacement amount data of the rotating shaft;
Detecting displacement data of the tool,
Displacement correction method for a machine tool, characterized in that said the predetermined factor data, including the displacement amount data of rotational speed data and Rotation axis of the detected rotational shaft. A tool for correcting the displacement of the tool by obtaining the displacement amount of the tool based on the correlation between the displacement amount data of the tool attached to the rotary shaft and machining the workpiece and the predetermined factor data affecting the displacement of the tool. In a displacement correction method in a machine,
Detecting temperature data at a suitable position of the machine tool;
Detecting a displacement amount data of rotational speed data and the rotational axis of the rotary shaft,
Detecting displacement data of the tool;
Wherein the predetermined factor data, wherein with inclusion of place of the temperature data of the machine tool, including a further said detected displacement amount data of rotational speed data and Rotation axis of the rotating shaft, displacement of the tool Obtaining a correlation between data and the predetermined factor data as an arithmetic expression by multivariate analysis;
Calculating the displacement amount of the tool based on the obtained arithmetic expression , the detected rotation speed data of the rotation shaft and the displacement amount data of the rotation shaft ;
Performing displacement correction of the tool based on the calculated amount of displacement of the tool;
A displacement correction method in a machine tool characterized by comprising:

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