JP3101072B2 - Time-dependent displacement correction device for cutting edge in NC machine tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to correction of the position of a cutting edge of a cutting tool applied to an NC machine tool controlled by numerical information such as an NC lathe, and more particularly, to a position of a headstock caused by heat or the like. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for correcting temporal displacement of a cutting edge in an NC machine tool that detects a temporal displacement of a position from a tool rest due to displacement and performs coordinate correction.

[0002]

2. Description of the Related Art An NC lathe stores a moving amount of a byte with respect to a certain coordinate and a moving speed thereof in advance as numerical information,
Based on the numerical information, the cutting tool is moved by the operation of the NC device so that the workpiece can be automatically cut. Therefore, in an NC machine tool such as an NC lathe, it is indispensable to accurately set the cutting edge position of a cutting tool with respect to a coordinate axis before starting machining in order to improve machining accuracy of a workpiece. is there.

There are various methods for correcting the position of the cutting edge of a cutting tool such as a tool, a drill, and a reamer with respect to a coordinate axis. Among them, there is a method of correcting the position of the cutting edge by directly measuring the position of the cutting edge. There are a correction method using a contact measurement method and a correction method using a non-contact measurement method. The correction method using the contact measurement method is to provide a contact measuring device such as a touch sensor inside the NC machine tool,
In this method, the position of the cutting edge of the cutting tool is measured, and the value is reflected on the NC device as a correction value for the origin of coordinates. In the case of the correction method using the contact measurement method, the cutting edge of the cutting tool must be contacted twice to secure the dimension of the workpiece in the longitudinal direction (Z direction) and the radial direction (X direction). If diamond is used for the cutting edge or the cutting tool has a very sharp cutting edge, contacting the cutting edge with the measuring instrument may lead to damage to the cutting edge. This is an undesirable phenomenon.

On the other hand, the correction method using the non-contact measurement method is a method of measuring the position of the cutting edge of the cutting tool in a non-contact state and correcting the position of the cutting edge of the cutting tool with respect to the coordinate axes. For example, a cutting tool cutting edge detecting device previously filed by the present applicant [Japanese Patent Application No. 3-37812 (Japanese Patent Application Laid-Open No. Hei 4-25655)].
No. 0). The correction method in this cutting tool edge detecting device measures the cutting edge position of the cutting tool using a measuring instrument such as a CCD camera installed in the NC machine tool, and automatically corrects the cutting edge position of the cutting tool. You can do it.

[0005] The above-mentioned method of correcting the position of the cutting edge, whether in the contact measurement method or the non-contact measurement method, is based on the coordinate axes set on the headstock or the like, and is based on the reference of the headstock of the cutting edge of the cutting tool. The correction is performed by shifting the relative position.

[0006]

By the way, a certain degree of machining accuracy can be obtained only by correcting the position of the cutting edge, but when a higher machining accuracy is required, the heat between the headstock and the tool rest is required. The problem is the relative displacement of the coordinate axes due to thermal expansion or thermal contraction of the rigid body.

For the displacement of the coordinate axes, it is necessary to actually measure the dimensions of the workpiece after trial-cutting the workpiece, and to perform a correction operation based on the measured value. As described above, since the distance from the tool rest to the headstock is not directly measured, there is a problem that a correction operation for correcting an error is required. Therefore, it is necessary to solve the problem that the configuration is such that the positional relationship between the headstock and the tool rest can be directly measured, and that the displacement of the coordinate axes can be automatically corrected.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to accurately detect the displacement of a headstock in a non-contact state in an NC machine tool, and Provided is an apparatus for correcting temporal displacement of a cutting edge in an NC machine tool, which is capable of correcting a coordinate relationship between a workpiece mounted on a coordinate axis and a cutting edge stand and automatically correcting a relative displacement of the coordinate axis due to an influence of heat or the like. That is.

According to the present invention, there is provided a time-dependent relative positional relationship caused by heat or the like between a headstock supporting a workpiece and a cutting edge of a cutting tool installed on a tool rest disposed opposite to the workpiece. A position detection device that detects displacement in a non-contact state as displacement information, and an NC device that corrects a relative position between a coordinate setting position and the cutting edge of the cutting tool based on the displacement information; The apparatus is provided with a luminous body that emits a light beam installed on the headstock, and a luminous body that is installed at a position corresponding to the cutting edge of the cutting tool in a fixed portion that is less distant from the headstock and the tool post and that is less affected by heat. A light spot position detecting device that receives a light beam from a body and measures a light spot position, and a blade edge detection device that is installed on the fixed portion and detects a blade shape and a blade position of the cutting tool in a non-contact state as image information. Equipment About temporal displacement correcting apparatus of the cutting edge in the NC machine tool consists of. Here, the light spot position detecting device is a PSD (position sensitive light).
tdetector), that is, a semiconductor position detecting element.

[0010] The fixing portion is provided on a cover that covers a processing portion of an NC machine tool having the headstock and the tool post.

[0011] The NC device includes a blade position correction value calculating unit that calculates a correction value of the blade position of the cutting tool from a temporal change in a relative position between the headstock and the tool post output by the position detecting device; And a servo motor control means for driving a servo motor based on the correction value.

More specifically, the NC device includes a first memory for storing, as image information, a cutting edge shape and a cutting edge position of the cutting tool detected by the cutting edge detecting device, and the image information stored in the first memory and the cutting edge detection. An image comparing means for comparing the image of the cutting tool captured by the device and issuing a signal when the two do not match, a cutting edge for inputting a signal from the image comparing means and calculating a correction value of a cutting tool cutting edge position Position correction value calculating means, a second memory for storing the light spot position of the light beam received by the PSD light spot position detecting device as a reference light spot position, and the reference light spot position and the PSD light stored in the second memory. A light spot position comparing means for comparing the light beam received by the spot position detecting device with the light spot position and issuing a signal when the two light beams do not match; A coordinate correction value calculating means for calculating a coordinate axis correction value by inputting a signal from the position comparison means and correcting the coordinate axis, and driving a servomotor based on the correction value of the cutting tool edge position or the correction value of the coordinate axis. Servo motor control means. Further, there is provided a memory correcting means for correcting the reference light spot position of the second memory when the light spot position comparing means outputs a signal.

Since the apparatus for correcting the temporal displacement of the cutting edge in this NC machine tool is constructed as described above, the coordinates of the coordinates of the cutting edge of the cutting tool and the coordinates of the coordinates of the headstock on which the workpiece is mounted in the NC machine tool. Since the detection device that detects the relationship in an optically non-contact state is provided, the temporal displacement between the headstock and the tool post can be accurately and accurately measured.

Also, a function of performing coordinate setting and correcting the position of the cutting tool with respect to the cutting edge based on the displacement information detected by the detection device is added to the NC device, so that the displacement of the coordinate axis caused by heat or the like is provided. Can be automatically corrected.

More specifically, since the blade detecting device is installed on a fixed member which is less distant from the headstock and the tool post and is less affected by heat, the displacement of the cutting tool blade position can be accurately detected by the blade detecting device. You. In addition, a light emitter is installed on the headstock and a PSD light spot position detecting device is installed on the fixing member, and the light spot position of the light beam emitted from the light emitter is measured by the light spot position detecting device using PSD. Therefore, even if the positional relationship of the headstock with respect to the fixed member changes due to thermal influence or the like, the displacement can be measured accurately and with high accuracy.

Further, the correction of the displacement of the coordinate axes is specifically performed as follows. First, a correction value is calculated for the deviation of the detected cutting tool edge position from the reference cutting edge position, and the servomotor is driven to make the cutting tool cutting edge position coincide with the reference cutting edge position. Next, a displacement of the headstock, that is, a correction value of the coordinate axis is calculated from a difference between the reference light spot position previously stored in the second memory and the light spot position detected by the light spot position detecting device. , And correct the coordinate axes. At the same time, the servo motor control means drives the servo motor to move the tool rest table by the correction value. In this way, even if the positional relationship between the headstock and the tool rest changes due to the influence of heat or the like, accurate coordinate setting can be performed automatically.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a device for correcting a temporal displacement of a cutting edge in an NC machine tool according to the present invention will be described below with reference to the drawings. Fig. 1 shows the NC machine tool (Fig. 1
FIG. 3 is a perspective view showing a part of an NC lathe. A headstock 11 and a tool rest table 12 are mounted on a main bed 10 of the NC machine tool. Workpiece W is mounted on the headstock 11.
Scroll chuck 1 as a workpiece gripping device for gripping
The workpiece W is rotatably supported.
The tool rest table 12 is mounted on an X-axis slide table 14, and the X-axis slide table 14 is mounted on a Z-axis slide table 15. The X-axis slide table 14 is screwed with an X-axis feed screw 16, and the Z-axis slide table 15 is screwed with a Z-axis feed screw 17. The tool post table 12 rotates the X-axis feed screw 16 and the Z-axis feed screw 17 by the operation of a Z-axis feed servo motor (not shown) and an X-axis feed servo motor 18, and moves in the Z-axis direction and the X-axis direction. It is configured to be movable.

FIG. 2 is a schematic front view showing a part of the NC machine tool. A processed portion of the NC machine tool for the workpiece W is covered with a cover 20 having high mechanical rigidity. A viewing window 22 in which a transparent plate 21 such as a glass plate is disposed is provided on the upper surface of the cover 20. An air outlet 24 is provided inside the transparent plate 21, that is, inside the machine 23, and is configured so that attached matter such as cutting oil and chips can be blown off by blowing air toward the transparent plate 21. A CCD camera 3 as a blade edge detection device is attached to a cover 20 as a fixing member, and is directed from the outside 25 to the inside 23 through the viewing window 22. CCD
The camera 3 is a charge coupled device camera. The working distance F of the CCD camera 3 is
The cutting tool is installed at a position that comes to the position of the cutting edge of a cutting tool T, which is a kind of a cutting tool installed opposite to the cutting tool. The CCD camera 3 fixes the plane of the orthogonal coordinate axes of the CCD camera 3 so as to be parallel to the plane of the cutting movement axis (XZ axis) of the cutting tool T of the NC machine tool.

On the other hand, the PSD light spot position detecting device 1
Is installed on the cover 20 adjacent to the CCD camera 3,
The surface of the PSD orthogonal coordinate axis is fixed so as to be parallel to the surface of the cutting movement axis (XZ axis) of the cutting tool T of the NC machine tool. The cover 20 includes a headstock 11 and a tool post table 12.
Since the thermal effect can be ignored compared to
And the position of the PSD light spot position detection device 1 may be considered to be unchanged. An opening / closing cover 26 is provided on a side surface of the cover 20. Further, in the machine of the NC machine tool, a light emitting body 2 such as a light emitting diode or a laser is mounted on the upper surface of the headstock 11. The light emitter 2 is fixed in such a direction that a light beam emitted from the light emitter 2 forms an image of a light spot on the PSD surface of the PSD light spot position detecting device 1.

FIGS. 3 and 4 are views showing a state in which the light beam emitted from the headstock 11 forms an image as a light spot on the PSD coordinate plane. FIG. FIG. 4 is an explanatory plan view. The precision of the magnification of the optical system 6 of the PSD light spot position detecting device 1 is increased because the PSD resolution is substantially equal to the displacement of the NC machine tool. When a displacement of a positional relationship occurs between the headstock 11 and the cover 20 due to thermal expansion or thermal contraction of a rigid body due to heat or the like, the light spot position 8 on the PSD coordinate plane is changed to the initial position (reference light spot). Move from position). Further, since the optical system 6 and the PSD 7 are fixed so as to be parallel to the cutting movement axis (XZ axis), the mechanical displacement components in the X axis direction and the Z axis direction are the X axis on the PSD coordinate plane. Direction and the moving distance of the light spot in the Z-axis direction.

FIG. 5 is a circuit diagram showing an example of a PSD light spot position detecting device 1 in the temporal displacement compensating device of the NC machine tool. The light spot position detecting circuit for obtaining a light spot position on a PSD coordinate plane as an electric signal. It is. P
SD7 is a square having a length of L × L. Symbols X ₁ , X ₂ , Z ₁ , and Z _{2 in} the figure are output signals (photocurrents) obtained from the respective electrodes, and symbols x and z are PSDs. The coordinates of the light spot position on the coordinates are shown. Note that P
The light spot position on the SD coordinate plane is obtained by the following equation. (X ₂ −X ₁ ) / (X ₁ + X ₂ ) = 2 × / L (Z ₂ −Z ₁ ) / (Z ₁ + Z ₂ ) = 2z / L Each electrode of the PSD is a conducting wire to a current / voltage conversion circuit. Are linked. Adds and subtracts the output value output from the current / voltage conversion circuit connected to the electrode in the Z direction,
Next, they are divided to output an electric signal. Furthermore,
Linear correction is performed by multiplying the electric signal by a predetermined coefficient, and the Z component of the light spot position in the PSD coordinates is calculated. Similarly, the X component of the light spot position in the PSD coordinates is calculated from the output signal obtained from the electrode in the X direction. Further, in order to increase the measurement accuracy, the coefficient for performing the linear correction is determined after sufficiently performing a calibration process or the like on the relationship between the magnitude of the electric signal and the actual displacement amount. The X component and the Z component of the light spot position in the PSD coordinate measured in this manner are represented by NC
The information is transmitted to the device 5.

FIG. 6 is a block diagram showing an embodiment of a temporal displacement correcting device in the NC machine tool. The temporal displacement compensating device includes a position detecting device 4 that detects a temporal displacement of a positional relationship between the headstock 11 and the tool rest table 12 caused by heat or the like in a non-contact state as displacement information, and based on the displacement information. And an NC device 5 that corrects the coordinate setting position and the cutting edge position of the cutting tool. The position detecting device 4 is provided on the headstock 11 and emits a light beam.
And a PSD light spot which is installed on a cover 20 which is a fixed portion remote from the headstock 11 and the tool rest table 12 and which has little thermal influence, and receives a light beam emitted from the light emitter 2 to measure a light spot position 8. And a position detecting device 1. Further, the position detecting device 4 has a cutting edge detecting device, that is, the CCD camera 3, which detects the cutting edge shape and the cutting edge position of the cutting tool as image information in a non-contact state.

The NC device 5 has a function other than its original function.
A first memory 30 for storing the cutting edge shape and the cutting edge position of the cutting tool captured by the CCD camera 3 as image information; comparing the image information stored in the first memory 30 with the image of the cutting tool projected by the CCD camera 3; Image comparison means 31, which emits a signal when the two do not match, a cutting edge position correction value calculation means 32, which receives a signal from the image comparison means 31 to calculate a correction value of the cutting tool blade position, and a PSD light spot position detection device 1. The second memory 33 stores the light spot position of the light beam received by the light source as the reference light spot position, the reference light spot position stored in the second memory 33, and the light spot position of the light beam received by the PSD light spot position detecting device 1. And a light spot position comparing means 34 and a light spot position comparing means 3 which emit a signal when they do not match.
The memory correction means 36 which corrects the reference light spot position of the second memory 33 when the signal from 4 is input, and the signals from the light spot position comparison means 34 are input to calculate the correction value of the coordinate axis and correct the coordinate axis. Correction value calculating means 3
5, and a servo motor control means 37 for driving the X-axis feed servomotor 18 and the Z-axis feed servomotor based on the correction value of the cutting tool blade position or the correction value of the coordinate axis.

FIGS. 7, 8 and 9 are flow charts showing the processing of an embodiment of the device for correcting the temporal displacement of the cutting edge in the NC machine tool. The time-dependent displacement correction step includes a step of storing an initial position of the cutting tool fixed to the tool rest table 12 and an initial position of the headstock 11, and a step of performing coordinate correction (correction of the displacement of the tool rest table 12 and main spindle movement). Correcting the displacement of the table 11).

First, the step of storing the initial position of the cutting tool fixed on the tool rest table 12, that is, the step of storing the cutting edge shape of the cutting tool T will be described. Referring to FIG. 7, one of the bytes T to be stored is selected from a plurality of bytes T and moved to a blade edge detection position (reference blade edge position) (step 41). Selected byte T
Is captured by a CCD camera (step 42). The projected video is stored in the first memory 30 as image information (step 43). The image information stored in the first memory 30 becomes the origin of the byte T. Hereafter, the byte T to be stored
Are sequentially selected, and the processing of steps 41, 42 and 43 is repeated. When the image information has been stored for all the bytes T to be stored, the step of storing the cutting edge shape ends. In the case of a single tool post, step 4
1, the processing of steps 42 and 43 is not repeated.

Next, the step of storing the initial position of the headstock 11 will be described. Referring to FIG.
A light beam is emitted from the light emitting body 2 toward the PSD 7 surface (step 44). The position of the light spot position 8 imaged on the surface of the PSD 7 is used as a reference light spot position as the second memory 30.
(Step 45).

The storage of the initial position is thus completed, and N
The C machine tool is operated. Then, the positional relationship between the headstock 11 and the tool rest table 12 gradually shifts over time. Therefore, the step of performing coordinate correction will be described next with reference to the flowchart of FIG.
First, a byte T to be detected is selected, and the byte T is photographed by the CCD camera 3 (step 47). The image information of the byte T stored in the first memory 30 and the CC
Compare the images captured by the D camera 3 (step 4
8). At this time, it goes without saying that the same bytes T are compared with each other. If the image information matches the image captured by the CCD camera 3, there is no need to perform any processing since the cutting edge position of the cutting tool T is still at the reference cutting edge position. If the image information and the image captured by the CCD camera 3 are shifted, a correction value is calculated by the amount of the shift (step 49).
That is, when the CCD camera 3 comes within the screen, the NC device
The coordinate axes of the C machine tool are fetched, and a numerical value of the cutting edge position is calculated by combining them to calculate a correction value. And
The NC device drives the X-axis feed servo motor 18 and the Z-axis feed servo motor to move the tool rest table 12 by a distance corresponding to the correction value (step 50).
As a result, the cutting edge position of the cutting tool T matches the reference cutting edge position.

Next, a light beam is emitted from the luminous body 2 to the PSD 7.
Emitted toward the surface (step 51). The light spot position formed on the surface of the PSD 7 is detected by the light spot position detection circuit described with reference to FIG. 5 (step 52). The detected light spot position is input to the NC device 5 and is stored in the second memory 3.
3 is compared with the reference light spot position stored in advance (step 53). If they match, there is no need for correction and the process ends. If they do not match, a correction value is calculated for the deviation (step 54). Then, the coordinate axis is shifted by the correction value (step 55), and the tool rest table 12 is moved by driving the X-axis feed servo motor 18 and the Z-axis feed servo motor by the correction value (step 56). Further, the detected light spot position is stored in the second memory as a new reference light spot position (step 57). Therefore, N
The correction can be made any number of times during the operation of the C machine tool. Thus, the coordinate correction of the cutting tool edge position is completed.

The steps of the above coordinate correction will be described from another angle as follows. 10, 11, and 1
FIG. 2 is an explanatory diagram showing processing steps in which the NC device moves the cutting tool edge position and performs coordinate correction. FIG. 10 shows the positional relationship before the coordinate correction, that is, the positional relationship between the headstock 11 and the cutting tool T when the distance between the headstock 11 and the tool rest table 12 changes due to the influence of heat or the like. FIG. 11 shows a state in which the cutting edge position of the cutting tool is corrected using the cutting edge detecting device, and FIG. 12 shows the state in which the tool post table 12 is moved using the PSD light spot position detecting device 1 and simultaneously the NC machine tool. 2 shows a state in which the coordinate axes are corrected. To explain the symbols in the figure, Y and Z are coordinate axes before correction, Y ₂ and Z ₂ are coordinate axes after correction, s ₀ is a reference headstock position, t ₀ is a reference blade position, and t ₁ is a temporal displacement. The cutting edge position of the cutting tool T and s indicate the headstock position after the temporal displacement.

Before starting the operation of the NC machine tool, the headstock 11 is at the reference headstock position s ₀ , and the cutting edge position of the cutting tool T set on the tool rest table 12 is at the reference cutting edge position t ₀ . However, the headstock 11
It is assumed that the distance between the tool rest 12 and the tool rest table 12 changes and moves to the cutting edge position t ₁ of the cutting tool T, and the position of the headstock 11 moves to s (see FIG. 10).

Therefore, first, the position of the cutting edge of the cutting tool T is corrected by the CCD camera 3 (see FIG. 11). This correction is performed in steps 47 to 50 described in detail in FIG.
Done by That is, before cutting the workpiece,
Since the cutting edge of the cutting tool T to be used is transferred to the CCD camera 3 and stored as image information, the CCD camera 3
Captures the coordinate axes of the NC machine tool, and calculates the correction value by calculating the numerical value of the cutting edge position of the cutting tool when the cutting edge deviates from this coordinate axis. The NC device moves the tool rest table 12 by a distance corresponding to this correction value.
The axis feed servo motor 18 and the Z axis feed servo motor are driven. As a result, the cutting edge position t ₁ of the cutting tool T coincides with the reference cutting edge position t ₀ on the coordinate axis of the NC machine tool captured by the CCD camera 3.

Next, at the same time as the tool rest table 12 is moved, the coordinate axes of the NC machine tool are corrected (see FIG. 12). This correction is performed in steps 51 to 51 described in detail in FIG.
This is performed by step 57. That is, since the tool rest table 12 is moved by a distance corresponding to the displacement of the headstock 11 in the X-axis direction and the Z-axis direction measured from the cover 20, X
The axis feed servo motor 18 and the Z axis feed servo motor are driven. At the same time, the coordinate axes of the NC machine tool are also Y ₂ ,
It is corrected to Z _2. As a result, the positional relationship between the headstock 11 and the tool rest table 12 is corrected, and accurate coordinate setting of the head stock 11 and the tool rest table 12 is performed on the coordinate axes of the NC machine tool.

[0033]

As described above, the apparatus for correcting temporal displacement of the cutting edge in the NC machine tool according to the present invention is constructed as described above, and the light beam emitted from the illuminant mounted on the headstock is imaged on the PSD surface. The displacement of the headstock on the NC machine tool coordinates can be detected by measuring the light spot position. Further, by moving the tool rest table by a distance corresponding to the displacement by the NC device and moving the coordinate setting of the NC machine tool in parallel, the accurate coordinate setting between the headstock and the tool rest table is automatically performed. be able to. Therefore, the cutting edge of the cutting tool can be automatically corrected in consideration of the displacement of the coordinate axis caused by the thermal expansion or contraction of the rigid body due to the heat between the tool rest and the headstock. , The processing accuracy can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an NC machine tool into which a device for correcting temporal displacement of a cutting edge in an NC machine tool according to the present invention can be incorporated.

FIG. 2 is a schematic front view showing a part of the NC machine tool.

FIG. 3 is an explanatory front view showing a part of the NC machine tool.

FIG. 4 is an explanatory plan view showing a part of the NC machine tool.

FIG. 5 is a circuit diagram of a light spot position detection circuit using a PSD.

FIG. 6 is a block diagram showing an embodiment of a temporal displacement correcting device in an NC machine tool according to the present invention.

FIG. 7 is a flowchart illustrating a processing step of storing an initial position of a tool rest table and storing a shape of a cutting edge;

FIG. 8 is a step of storing an initial position of the headstock,
9 is a flowchart illustrating processing steps for storing a reference light spot position.

FIG. 9 is a flowchart illustrating processing steps for correcting the coordinates of the cutting edge position of the cutting tool.

FIG. 10 is an explanatory diagram showing a positional relationship before correction, that is, a positional relationship between the cutting tool and the headstock when the distance between the headstock and the tool rest table changes due to the influence of heat.

FIG. 11 is an explanatory diagram illustrating a state in which correction is performed by the blade edge detection device.

FIG. 12 is an explanatory diagram showing a state in which the coordinate axis of the NC machine tool is corrected at the same time that the tool rest table is moved.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 PSD light spot position detection device (light spot position detection device) 2 Light-emitting body 3 CCD camera (cutting edge detection device) 4 Detecting device 5 NC device 11 Spindle stand 12 Tool post table 18 X-axis feed servomotor 20 Cover (fixed part) Reference Signs List 30 first memory 31 image comparison means 32 blade edge position correction value calculation means 33 second memory 34 light spot position comparison means 35 coordinate correction value calculation means 36 memory correction means 37 servo motor control means

Claims (3)

(57) [Claims] 1. A headstock for supporting a workpiece and the workpiece.
The cutting edge of the cutting tool installed on the turret placed opposite
A position detecting device for detecting a non-contact state as the displacement information with time displacement due to the resulting relative positional relationship to the heat or the like and, before the cutting tool and the coordinate setting position based on the displacement information
And a NC device for correcting the relative position of the serial cutting edge, before
The position detection device emits a light beam installed on the headstock.
Radiating body, heat away from the headstock and the tool rest.
A part corresponding to the cutting edge of the cutting tool in the fixed part with little effect
And receive the light beam from the luminous body
A light spot position detecting device for measuring a light spot position,
The cutting edge shape and cutting edge of the cutting tool installed on the fixed portion
Blade edge detection device that detects the position as image information in a non-contact state
A time-dependent displacement correction device for a cutting edge in an NC machine tool comprising: 2. The method according to claim 1, wherein the fixed portion includes the headstock and the tool rest.
Provided on a cover for covering a processing portion of an NC machine tool having
2. The time-dependent displacement correction device for a cutting edge in an NC machine tool according to claim 1, wherein the displacement is corrected. Wherein the NC device, the position detecting device edge position correction value calculating means for calculating a correction value of the tip position of the cutting tool from time displacement of the relative position of said headstock and said tool rest for outputting , and since it has a servo-motor control means for driving the servo motor based on the correction value
The apparatus for correcting temporal displacement of a cutting edge in an NC machine tool according to claim 1.