JP2000074644A - Measuring apparatus of rod type cutting tool and measuring method of drill which uses the measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit simple and quick measurement of many measuring items with one program, by processing images picked up by a Y-axis TV camera and a Z-axis TV camera. SOLUTION: On the upper surface of a surface plate 1, a Y-axis table 2 is slidably installed parallel with an axial line (a) and driven by a motor 21 for driving the Y-axis table. A tool holding means wrapping a drill 10 (rod type cutting tool) consists of a work head 3, a work spindle 4, etc. The rotating shaft of the drill 10 is made to coincide with the axial line (a), and the drill 10 is rotatably fixed. The drill 10 is driven and rotated by a motor 22 for driving the work spindle. A Y-axis microscope 33 and a Y-axis TV camera 31 are arranged facing the drill 10. A Z-axis TV camera 32 for sensing the drill 10 from the vertical direction and a Z-axis microscope 34 are installed on a Z-axis table 5. By processing images picked up by the two TV cameras 31, 32, a plurality of measuring items such as the dimension, shape precision, etc., of the drill 10 are measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool measuring device for measuring the size and shape accuracy of a so-called bar-shaped cutting tool such as a drill and an end mill, and more particularly, to measuring the size and shape accuracy of a tool to be measured over a plurality of items. The present invention relates to a measuring device for a rod-shaped cutting tool, which is configured to be capable of measuring sequentially in a setup of a round, and a measuring method of a drill using the measuring device.

[0002]

2. Description of the Related Art A so-called bar-shaped cutting tool such as a drill and an end mill used in a machine tool is measured in dimensions and shape accuracy in a final inspection step of creation or re-grinding by a tool maker or a machine tool maker. . For example, when the bar-shaped cutting tool is a drill, the measured shape parameters include a diameter, a tip angle, a lip height, a margin width, a land width, a lead, a torsion angle, a core thickness, a second depth, an eccentricity of a chisel. And so on, depending on the processing purpose and required accuracy. It should be noted that the measurement item indicates which part of the drill is defined in the JIS standard, but is shown in FIG. 21 for reference.

[0003] The dimensions of general drills except special products are J
Standards are defined in IS (for example, JIS B 4301 in the case of a straight shank drill), and a general example of the test method is also shown. For example, the method of measuring the diameter of the drill with a micrometer (JIS B 7502), the method of measuring the eccentricity of the chisel edge with a V block and supporting the drill with a tool microscope (JIS B 7153), the method of measuring the lip height with the V block and supporting the drill with a dial gauge (JIS B7503), and the like, are shown, and these measuring methods are still being implemented at the manufacturing site. These measurement methods are simple, but the test methods differ depending on the measurement items, so several types of measuring instruments must be used, and high-precision measurement in micron units cannot be performed with a micrometer or gauge. Moreover, there is a problem that an error is caused by the operator. In order to cope with such a problem, Japanese Patent Application Laid-Open No. 8-197381 proposes an automatic measuring device for measuring a plurality of shape parameters of a cutting tool in a non-contact manner by a laser measuring device.

[0004]

However, Japanese Patent Application Laid-Open No. Hei 8-1
The measurement device disclosed in Japanese Patent No. 97381 does not satisfy all the inspection items of the drill because the measurement items are limited. Further, even if it can respond to a large number of measurement items, it cannot respond to the shape parameters of the tip of the drill, such as the core thickness and the eccentricity of the chisel.

[0005] The present invention is to solve the problems of the prior art, and in the measurement of the shape parameters of a rod-shaped cutting tool typified by a drill or an end mill, a large number of measurement items are set up by one setup. Provided is a rod-shaped cutting tool measuring device and a drill measuring method using the measuring device, which can be measured easily and quickly, and can also measure the shape parameter of a tip portion required for a drill or the like. The purpose is to:

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an apparatus for measuring a bar-shaped cutting tool as described below. The overall shape of the bar-shaped cutting tool according to the present invention is substantially bar-shaped.
By rotating about the longitudinal direction as an axis, a predetermined cutting process is performed on a workpiece by a cutting edge provided on a tip portion or a side portion. Specifically, it is a drill (twist drill), end mill, reamer, or the like.

According to the first aspect of the present invention, there is provided a measuring device for measuring the dimension and shape accuracy of a rod-shaped cutting tool,
A tool for holding the rod-shaped cutting tool so as to be rotatable around the axis with its rotation axis as the axis, and a tool holding means capable of detecting the rotation angle position thereof, such that the tool holding means is rotationally driven around the axis. The rotation drive means, the tool holding means, and a Y-axis table which is operable in the direction of the axis and capable of detecting the displacement thereof, and the Y-axis table is moved in the direction of the axis. A Y-axis microscope including a Y-axis table driving unit configured to be linearly driven, an objective lens arranged to face the rotation driving unit in the direction of the axis, and a Y-axis television camera mounted on the Y-axis microscope And Y so that the bar-shaped cutting tool held by the tool holding means can be observed from a direction perpendicular to the axis.
Z-axis microscope equipped with an objective lens arranged in a direction perpendicular to the axis table, and Z mounted on the Z-axis microscope
A Z-axis table capable of holding a Z-axis television camera, a Z-axis microscope, and being operable in a direction perpendicular to the Y-axis table and capable of detecting the amount of displacement thereof; A Z-axis table driving means adapted to be driven linearly in a direction perpendicular to the camera, and by processing images taken by the two television cameras,
There is provided an apparatus for measuring a rod-shaped cutting tool, comprising: an image processing apparatus configured to measure a plurality of measurement items relating to the dimension and shape accuracy of the rod-shaped cutting tool.

With this configuration, when measuring the shape parameters relating to the outer peripheral portion of the rod-shaped cutting tool to be measured, the Y-axis table driving means positions the rod-shaped cutting tool in the axial direction and the rotation driving means. Is positioned around the axis of the bar-shaped cutting tool, and the Z-axis table driving means positions the bar-shaped cutting tool relative to the Z-axis television camera for observing the bar-shaped cutting tool from the vertical direction of the axis. Desired image data on the outer peripheral portion of the cutting tool is obtained. on the other hand,
When measuring the shape parameters related to the tip of the rod-shaped cutting tool, the rotation driving means positions the rod-shaped cutting tool around the axis, and the Y-axis table driving means observes the rod-shaped cutting tool from the front of the tip. The relative positioning of the television camera and the bar-shaped cutting tool is performed, whereby desired image data on the tip of the bar-shaped cutting tool is obtained. Therefore, by controlling the Y-axis table driving unit, the Z-axis table driving unit, and the rotation driving unit in accordance with a predetermined operation program, only one setup when holding the bar-shaped cutting tool on the tool holding unit is performed. All the image data necessary for measuring the shape parameters can be automatically obtained.

According to a second aspect of the present invention, in the first aspect of the invention, an upper illuminating means for irradiating illumination to the measurement site from the same direction as the Z-axis microscope, and Rod-shaped illumination means for irradiating illumination from a direction opposite to the Z-axis microscope, and forward illumination means for illuminating the measurement site from the same direction as the Y-axis microscope. A measuring device for cutting tools is provided. Note that the measurement site here refers to a measurable area of the Z-axis microscope with respect to the rod-shaped cutting tool held by the tool holding means, and specifically, an intersection between the optical axis of the Z-axis microscope and the axis and the vicinity thereof. Say the area. In actual use, after the bar-shaped cutting tool held by the tool holding means is moved to the measurement site by operating the Y-axis table, an image is acquired with a Z-axis microscope.

[0010] Among the shape parameters, the drill diameter (D ₁ ), tip angle (Θ ₁ ), and lip height (D ₂ )
For the measurement of, since the measurement accuracy is higher when calculated based on the contour shape of the captured image, a lower illumination unit configured to irradiate the measurement site with illumination from the opposite direction to the Z-axis microscope is provided, By using this, the Z-axis microscope will acquire a shadow image of the bar-shaped cutting tool. On the other hand, the margin width of the drill (D ₃ ), land width (D ₉ ),
The measurement of the lead (D ₁₄ ) and the torsion angle (θ) is calculated based on the grayscale distribution of the photographed image, so that the measurement site is illuminated in the same direction as the Z-axis microscope. By using the above-mentioned upper illumination means and using this, the Z-axis microscope acquires a grayscale image viewed from the side of the rod-shaped cutting tool. In addition, the drill core thickness (D ₁₀ ), the second depth (D ₁₂ ), and the chisel eccentricity (D
_In the measurement of ₁₃ ), since image data when the bar-shaped cutting tool is viewed from the tip is necessary, the measurement site is required to be Y
By using a front illumination means adapted to emit illumination from the same direction as the axis microscope, and using this, the Y-axis microscope acquires a grayscale image viewed from the tip of the rod-shaped cutting tool.

For the measurement of the chisel eccentricity (D ₁₃ ), it is necessary to recognize the intersection of the two flank surfaces, that is, the chisel edge, but it is not necessary to simply irradiate the illumination from the tip of the rod-shaped cutting tool with the front illumination means. Since the grayscale distributions of the captured images of the two flank surfaces are substantially equal, it becomes difficult to recognize the chisel edge, which is the boundary between them.

Therefore, in the invention according to claim 3, in the invention according to claim 2, the front illuminating means has a substantially ring shape, and is provided on substantially the entire inner peripheral surface of the ring portion at the center of the ring portion. There is provided irradiation means which can irradiate the light toward the inner surface, and the irradiation means can be divided into an upper part and a lower part of the inner peripheral surface so as to individually irradiate. Accordingly, when measuring the chisel eccentricity (D ₁₃ ), the illuminance of the irradiating means is set to be different from each other in the irradiating means which is vertically divided and individually irradiable, so that two flank surfaces are photographed. The density distribution of the image is made different to facilitate recognition of the chisel edge that is the boundary.

Further, in the invention according to claim 4,
In the invention according to claim 2 or 3, the front illuminating means is mounted on an A-axis table operable in the direction of the axis by table driving means. This makes it possible to arrange the front illumination means at an appropriate position even for various bar-shaped cutting tools having different lengths, diameters, or tip angles.

The invention according to claims 5 to 14 described below provides a method for measuring each shape parameter of a drill using the rod-shaped cutting tool measuring device according to any of claims 2 to 4.

[0015] In the invention according to claim 5, the second aspect is provided.
The drill diameter (D ₁ ) was calculated using the rod-shaped cutting tool measuring device according to any one of ( ₁ ) to ( ₄ ). That is, while irradiating a drill as a bar-shaped cutting tool by the lower illumination means, photographing the drill by the Z-axis television camera, and processing the photographed image, the image processing apparatus may be configured to attach a drill tip in the photographed image to an arbitrary point. Is set, a minimum value and a maximum value of coordinates in a drill radial direction in the measurement region are obtained, and a difference between the minimum value and the maximum value is calculated as a drill diameter (D ₁ ). Drill measurement method was provided.

Further, in the invention according to claim 6, the drill tip angle (Θ ₁ ) is calculated by using the rod-shaped cutting tool measuring device according to any one of claims 2 to 4. That is, while irradiating the drill as a rod-shaped cutting tool by the lower illumination means, and photographing the drill by the Z-axis television camera, the image processing apparatus for processing the photographed image, an arbitrary measurement region at the tip of the drill The edge coordinate group is measured for each of the two cutting edges of the drill in this measurement area, and approximate curves (l ₁ ) and (l ₂ ) are obtained for each of the edge coordinate groups. The angle between the approximate curves (l ₁ ) and (l ₂ ) was calculated as the drill tip angle (Θ ₁ ).

Further, in the invention according to claim 7, the lip height (D ₂ ) of the drill is calculated by using the rod-shaped cutting tool measuring device according to any one of claims 2 to 4. That is, while irradiating a drill as a bar-shaped cutting tool by the lower illumination means, and photographing a drill by the Z-axis television camera, and processing the photographed image, the image processing apparatus according to claim 5, 7. A straight line (l ₃ ) passing through the coordinate point (p ₁ ) and parallel to the Y axis and a straight line (l ₄ ) passing through the coordinate point (p ₂ ) of the maximum value and parallel to the Y axis, respectively. Y-axis of the two approximate curves (l ₁₎ and (l ₂₎ coordinate point at the intersection of the respective (p ₃₎ and (p ₄₎ determined, the coordinate point and (p ₃₎ and (p ₄₎ The difference in direction is determined by the lip height of the drill (D
₂ ).

In the invention according to claim 8, the margin width (D ₃ ) of the drill is calculated by using the rod-shaped cutting tool measuring device according to any one of claims 2 to 4. That is, in the image processing apparatus that irradiates a drill as a bar-shaped cutting tool with the upper illumination unit, photographs the drill with the Z-axis television camera, and processes the photographed image, the straight line (l) according to claim 7.
₃ ) Find the center line (l ₇ ) of the drill from (l ₄ ) and
An arbitrary measurement area is set at a portion of the drill that forms a margin, an edge coordinate group that forms a margin is measured in this measurement area, and two approximate curves (l ₅ ) and (l ₆ ) are obtained from the edge coordinate group. And obtain the two approximate curves (l
₅ ) and (l ₆ ), the coordinate points (p ₅ ) and (p ₆ ) of the intersections of the center line (l ₇ ) and the midpoint of the coordinate points (p ₅ ) and (p ₆ ) , A straight line (l ₈ ) perpendicular to the center line (l ₇ ) is obtained, and a coordinate point (p ₇ ) of each intersection of the straight line (l ₈ ) and the approximate curves (l ₅ ) and (l ₆ ) is obtained. ) And (p ₈ ) are obtained, and the margin width of the drill is determined based on the difference (D ₄ ) in the X-axis direction between the coordinate points (p ₇ ) and (p ₈ ) and the torsion angle (θ) of the drill. (D ₃ ) was calculated.

According to the ninth aspect of the present invention, the land width (D ₉ ) of the drill is calculated using the rod-shaped cutting tool measuring device according to any one of the second to fourth aspects. That is, while irradiating the drill as a rod-shaped cutting tool by the upper illumination means, and photographing the drill by the Z-axis television camera, in the image processing apparatus that processes this photographed image, at an arbitrary position on the heel of the drill A coordinate point (p ₉ ) is set, and a foot of a perpendicular drawn from the coordinate point (p ₉ ) to the approximated curve (l ₅ ) according to claim 8 is defined as a coordinate point (p ₁₀ ). based on ₁₀₎ and the coordinate point (X-Y distance on the plane of the p ₉₎ (D ₅₎ and the Z-axis direction of the distance (D _8), so as to calculate the drilling of land width (D ₉₎ did.

According to the tenth aspect of the present invention, the drill lead (D ₁₄ ) is calculated by using the rod-shaped cutting tool measuring device according to any one of the second to fourth aspects. That is, after the Y-axis table is moved with reference to the measurement position of the margin width (D ₃ ) according to claim 8 by an amount substantially equal to the lead length based on the dimensions of the drill as a bar-shaped cutting tool. Irradiating the drill with the upper illuminating means, photographing the drill with the Z-axis television camera, and processing the photographed image. In the image processing apparatus, an arbitrary measurement area is set at a part of the drill forming a margin. _{9. A} group of edge coordinates forming a margin in the measurement area is measured, an approximate curve (l ₉ ) is obtained from the group of edge coordinates, and the approximate curve (l ₉ ) and the center line (l) of the drill according to claim 8 are determined. ₇ ) Coordinate point of intersection with (p ₁₁ )
And the distance between the coordinate point (p ₁₁ ) and the coordinate point (p ₅ ) described in claim 8 is calculated as a drill lead (D ₁₄ ).

According to the eleventh aspect of the present invention, the torsion angle (θ) is calculated using the rod-shaped cutting tool measuring device according to any one of the second to fourth aspects. That is, the torsion angle (θ) is calculated based on the drill diameter (D ₁ ) calculated in claim 5 and the drill lead (D ₁₄ ) calculated in claim 10.

According to the twelfth aspect of the present invention, the thickness of the drill core (D ₁₀ ) is calculated using the rod-shaped cutting tool measuring device according to any of the second to fourth aspects. That is, while irradiating a drill as a rod-shaped cutting tool with the front illumination means, photographing the drill with the Y-axis television camera, and processing the photographed image, the image processing apparatus treats the photographed image as a whole with an arbitrary threshold. , The center of gravity coordinate point of the connected element equal to or larger than the threshold value is obtained as the drill center (c ₂ ). On the other hand, the respective edge coordinate groups (a _m ) and (a _m ) on the two cutting edges of the drill b _n ) was measured, and the position passing through the drill center (c ₂ ) and at which the distance between the two edge coordinate groups became minimum was calculated as the drill core thickness (D ₁₀ ).

According to the thirteenth aspect of the present invention, the second drilling depth (D ₁₂ ) is calculated using the rod-shaped cutting tool measuring device according to any one of the second to fourth aspects. did. That is, in the image processing apparatus which irradiates a drill as a bar-shaped cutting tool by the front illumination means, shoots a drill by the Y-axis television camera, and processes the shot image, an arbitrary coordinate point on the second cutting surface A distance (D ₁₁ ) between (p ₁₂ ) and the drill center (c ₂ ) according to claim 12 is determined, and a drill determined from the distance (D ₁₁ ) and the drill diameter (D ₁ ) according to claim 1. The difference from the radius (r) was calculated as the second drilling depth (D ₁₂ ).

In the invention according to claim 14, the chisel eccentricity (D ₁₃ ) of the drill is calculated by using the measuring device for a bar-shaped cutting tool according to any one of claims 2 to 4. That is, in the image processing apparatus that irradiates a drill as a bar-shaped cutting tool with the front illumination unit, photographs the drill with the Y-axis television camera, and processes the photographed image, the drill center ( A measurement area is set near c ₂ ), an edge coordinate group in this measurement area is measured, an approximate curve (l ₁₀ ) is obtained from the edge coordinate group, and the approximate curve (l ₁₀ ) and the drill center (c) are determined. The distance from ₂ ) was calculated as the chisel eccentricity (D ₁₃ ) of the drill.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a measuring device for a rod-shaped cutting tool, and FIG. 2 is a front view thereof. In order to hold the bar-shaped cutting tool 10 and fix it at a predetermined position, a Y-axis guide including well-known guide means such as an ant guide extending parallel to the axis a is fixed to the upper surface of the surface plate 1. The Y-axis table 2 is slidably provided along the Y-axis guide. The Y-axis table 2 is driven by a Y-axis table driving motor 21 as Y-axis table driving means. More specifically, a pulse motor is used as the Y-axis table driving motor 21, and the driving force of this pulse motor is transmitted to the Y-axis table 2 via a ball screw (not shown) and is driven. Here, as shown in FIG. 3, a Y coordinate is defined along a Y-axis guide, and a displacement amount of the Y-axis table 2 in the Y-axis direction is represented as a moving distance with respect to an arbitrary reference point on the Y-axis. . This moving distance is detected by a position detecting means (not shown) such as a linear scale.

On the upper surface of the Y-axis table 2, a tool holding means for holding a drill 10 as a bar-shaped cutting tool and fixing it at a predetermined position is mounted. The tool holding means includes a work head 3, a work spindle 4, a collet 7
It is composed of The work head 3 has a work spindle 4 that is rotatable around a predetermined axis a that is horizontal to the mounting surface of the surface plate 1. As shown in FIG. 4, a groove is cut at the tip of the work spindle 4, and a collet 7 for fixing a drill 10 is fixed to the work spindle 4 by a nut 6, and a drill 10 is attached to the collet 7.
, And further tighten the nut 6 to fix the drill 10. The drill 10 is rotatably fixed to a predetermined position by the collet 7 with its rotation axis coinciding with the a-axis. The work spindle 4 is a work spindle drive motor 2 as a rotation drive means.
2 driven. More specifically, a pulse motor is used as the work spindle drive motor 22, and the driving force of the pulse motor is transmitted to the work spindle 4 via the belt 24 and is driven. The rotation angle position is
It is detected by an angular position detecting means (not shown) such as a rotary encoder provided coaxially with the rotation axis of the work spindle 4.

The upper surface of the surface plate 1 is formed of a known guide means such as an ant guide which is provided upright in a direction perpendicular to the axis a.
An axis guide is mounted, and Z-axis guide
The shaft table 5 is slidably provided. The Z-axis table 5 is driven by a Z-axis table driving motor 23 as Z-axis table driving means. More specifically, a pulse motor is used as the Z-axis table driving motor 23, and the driving force of the pulse motor is transmitted to the Z-axis table 5 via a ball screw (not shown) and driven. Here, as shown in FIG. 3, the Z coordinate is defined along the Z-axis guide, and the displacement amount of the Z-axis table 5 in the Z-axis direction is expressed as a moving distance with respect to an arbitrary reference point on the Z-axis. .
This moving distance is detected by a position detecting means (not shown) such as a linear scale.

On the Z-axis table 5, the drill 10 is
A Z-axis television camera 32 for photographing from a direction perpendicular to the camera and a Z-axis microscope 34 having an objective lens are provided via a fixing member. The Z-axis microscope 34 is provided with an illumination guide 35 as an upper illumination means adapted to emit illumination from above the drill 10 in a direction perpendicular to the axis a. By providing the illumination guide 35 as an upper illumination means adapted to irradiate the measurement site with illumination in the same direction as the Z-axis microscope 34, the Z-axis microscope 34 is viewed from the side of the drill 10. A shaded image can be obtained. Further, a bracket is attached to the Z-axis guide, and an illumination guide 36 as a lower illuminating means adapted to emit illumination from below the drill 10 in a direction perpendicular to the axis a is fixed to the bracket. ing. In this way, Z
By providing the illumination guide 36 as a lower illumination means adapted to irradiate illumination from a direction opposite to the axis microscope 34, the Z-axis microscope 34 can obtain a shadow image of the rod-shaped cutting tool.

On the other hand, on the upper surface of the surface plate 1, a Y-axis television camera 31 for photographing the tip of the drill 10 in a direction horizontal to the axis a, and a Y-axis microscope 3 having an objective lens.
3 is provided via a fixing member. In addition, surface plate 1
An A-axis guide, which is composed of well-known guide means such as a dovetail guide extending parallel to the axis a, is placed on the upper surface of the A. The A-axis table 8 is slidable along the A-axis guide. It is provided in. Here, as shown in FIG. 3, the A coordinate is defined along the A axis guide.

A bracket is attached to the A-axis guide, and an illumination guide 37 as front illumination means for illuminating the drill 10 from the direction of the axis a is fixed to the bracket. . As described above, the illumination guide 3 serving as a front illumination unit configured to irradiate the measurement site with illumination from the same direction as the Y-axis microscope 33.
By providing 7, the Y-axis microscope 33 can obtain a gray-scale image viewed from the tip of the drill 10. Further, the illumination guide 37 has a substantially ring shape, and has irradiation means capable of irradiating substantially the entire inner peripheral surface of the ring portion toward the center of the ring portion. Is divided into an upper part and a lower part, and can be individually irradiated.
Thus, as shown in the captured image of the drill point of Figure 5, in measuring the chisel eccentric D _13, in the illumination means which is to be radiated individually divided vertically, up and down the illuminance of the irradiation means In this case, the density distribution of the captured images on the two flank surfaces is made different from each other, thereby facilitating recognition of the chisel edge which is the boundary.

The above-described A-axis table 8 on which the illumination guide 37 is mounted can be manually moved using an A-axis table driving handle 9 as table driving means. As a result, even for various drills with different lengths, diameters, or tip angles,
The lighting guide 37 can be arranged at an appropriate position. The drive means of the A-axis table 8 is driven by a ball motor using a pulse motor as in the above-described Y-axis table 2 and Z-axis table 5 in addition to the manual operation using a handle. You may do so.

The configuration relating to the mechanical elements of the measuring device for a bar-shaped cutting tool according to the present invention has been described above. Next, a system configuration for enabling the automatic measurement in the measurement apparatus according to the present invention will be described with reference to FIG. Control of automatic measurement is performed by a computer. The computer has various interfaces, CP
U, a memory, an auxiliary storage device, and the like. Further, the computer is connected to a keyboard, a display, a mouse, and the like via an interface, thereby enabling data exchange with the outside. The computer drives the Y-axis table 2, the Z-axis table 5, and the work spindle 4 by a pulse controller and a motor driver, and the television cameras 31, 32 by an image processing controller as an image processing device.
Has a role of performing image processing on an image captured by the camera or controlling illuminance of each lighting unit via a parallel interface.

The measurement is automatically performed by a playback method. That is, the drill 10 to be measured is
In advance, the measurement area and the measurement method at each measurement point are taught in advance, and the teaching data is stored in the auxiliary storage device of the computer. Then, the measurement is performed based on the stored teaching data. At this time, regarding the slight displacement of the measurement area,
An accurate measurement is performed by detecting a displacement at a certain reference measurement point and sequentially correcting the measurement area according to the displacement data. The detected coordinates are calculated by a computer by associating the center coordinates of the image with the coordinates detected by the position detecting means of each table. By the way, since some measurement items use measurement data of another measurement item, by setting the measurement order of the measurement items in advance in consideration of such points,
Measurement can be performed efficiently.

Hereinafter, a method of measuring each part of the drill by the measuring device according to the present invention will be described. FIG. 21 shows the appearance of the straight drill to be measured and the names of each part. The names of the components shown in FIG. 21 are defined in the JIS standard. 9 to 14,
The XY coordinates in FIG. 16 are defined as shown in FIG. Further, in FIGS. 9 to 14 and FIGS. 16 to 20, a white frame indicates an image area s, a white circle indicates a measurement point p, a thick black line indicates a line segment 1 (ell), and a white line segment indicates each measurement length D. The measurement items were a diameter, a tip angle, a lip height, a margin width, a land width, a lead, a torsion angle, a core thickness, a second depth, and an eccentricity of a chisel.

Before describing the measuring method, the focusing method will be described. When performing measurement using an image processing technique, it is generally known that an error occurs in a measured value when image processing is performed on a blurred image. Therefore, in order to shoot an image without blurring, the focus must be adjusted. Performing this focusing automatically is called autofocus. In auto focus, while moving an axis parallel to the optical axis of a television camera to be photographed, the density variance value of a differential image is sequentially calculated for a certain area where a captured image is focused, and the density variance value becomes maximum. The coordinates are detected, and this is set as the focal point position. In the present invention, the Y-axis television camera 31 installed in the horizontal direction with respect to the drill 10 is moved by moving the Y-axis table 2, and the Z-axis television camera 32 installed in the vertical direction with respect to the drill 10 is moved. By moving the Z-axis table 5, autofocus can be performed.

Since an objective lens is mounted on each of the microscopes 33 and 34, various drill diameters can be measured by changing the lens magnification, and high-precision measurement in units of microns can be realized. I have.

By the way, when an image taken by a television camera 32 installed in a direction perpendicular to the drill 10 is measured by image processing, as shown in FIG. On the other hand, it is necessary to measure an image taken with the cutting edge of the drill 10 being vertical. Therefore, image processing is performed on an image taken from the Y-axis television camera 31 installed in the a-axis direction, and the angle between the cutting edge and the horizontal axis of the Y-axis television camera 31 is measured.
By rotating the work spindle 4 holding the drill 10 so that this angle becomes zero, the cutting edge of the drill 10 is perpendicular to the optical axis of the Z-axis television camera 32. Thereby, at the time of the setup work for mounting the drill 10 on the collet 7, the work can be automatically and quickly performed without manually adjusting the mounting position of the drill 10 in the rotation direction.

The measurement items from the diameter to the lead, which will be described below, are measured by performing image processing on an image taken from a Z-axis television camera 32 installed in a direction perpendicular to the drill 10. .

[0039] With reference to FIG. 9, illustrating a method for measuring a diameter D _1. At the time of the measurement, an illumination guide 36 as a lower illumination means for irradiating from below the drill 10 is used. The minimum coordinate point p ₁ in the X-axis about the edge of the drill 10 measured in the image area s _1, the maximum coordinate point p ₂ in the X-axis about the edge of the drill is measured at more image areas s _2, this point p ₁ and the point the horizontal distance with respect to the X-axis and p ₂ is calculated as the diameter D _1.

[0040] With reference to FIG. 10, a description will be given of a measuring method of the point angle theta _1. At the time of the measurement, an illumination guide 36 as a lower illumination means for irradiating from below the drill 10 is used. The edge coordinate group was measured about the cutting edge of the drill 10 in the image area s _3, measures the edge coordinate group about the cutting edge of the drill 10 Similarly, in the image area s _4, applying the least-squares method for each of the coordinate group By doing so, approximate straight lines l ₁ and l ₂ are calculated. Calculating the angle between the two straight lines l _1, l ₂ as the tip angle theta _1.

Referring to FIG. 11, a method of measuring the lip height D ₂ will be described. When measuring, use a drill 10
Guide 3 as a lower illumination means for irradiating from below
Use 6. A straight line parallel to the Y axis passing through the point p ₁ calculated in the above-described measurement of the diameter D ₁ is defined as l _3.
A straight line passing through ₂ and parallel to the Y axis is defined as l ₄ . Then, the straight line l ₃ and the straight line l calculated in the measurement of the aforementioned tip angle Θ ₁
Calculating ₁ intersection with the p _3, and a straight line l ₄ the intersection p ₄ between the straight line l ₂ calculated in the measurement of the aforementioned point angle theta _1, respectively. The horizontal distance in the Y-axis between the point p ₃ and the point p ₄ is calculated as a lip height D _2.

[0042] With reference to FIGS. 12 and 13, will be described method of measuring the margin width D _3. At the time of the measurement, an illumination guide 35 as an upper illumination means for irradiating from above the drill 10 is used. Prior to the measurement of the margin width D _3, linear l ₃ of the aforementioned center line l ₇ of the drill 10 and the line l
Calculate as the middle line of ₄ . Approximate straight lines l ₅ and l ₆ are calculated by measuring edge coordinate groups in the image area s ₅ and the image area s ₆ forming the margin, and applying the least squares method to each coordinate group. The points of intersection of the approximate lines l ₅ and l ₆ and the center line l ₇ are defined as points p ₅ and p ₆ . And a line perpendicular street centerline l ₇ the midpoint of this point p ₅ and point p ₆ to the straight line l _8. 13, the intersection of the straight line l ₈ and the straight line l ₅ p7, the intersection of the straight line l ₈ and the straight line l ₆ and p _8. The horizontal distance with respect to the X-axis of the p ₇ and point p ₈ This point and D _4. Assuming that the torsion angle of the drill is θ, the margin width D ₃ is D ₃ = D ₄
Xcos θ.

Referring to FIGS. 14 and 15, land width D
The measurement method ₉ will be described. FIG. 15 is a conceptual sectional view as viewed from the tip of the drill. At the time of the measurement, an illumination guide 35 as an upper illumination means for irradiating from above the drill 10 is used. First, to measure the point p ₉ on the heel. The perpendicular foot drawn from this point p ₉ in a straight line l ₅ described above and the point p _10. The land width D ₉ is calculated from the distance D ₅ between the points p ₉ and p ₁₀ on the XY plane and the distance D _{8 in the} Z direction. In particular, D ₈ is the distance between the point p ₉ and the center line l ₇ described above.
_6, and the radius of the drill 10 and r (1/2 of the aforementioned diameter D _1), from ΘA and ΘB shown in FIG. 15, D ₈ is D
Is calculated as _{8 = r × (cosΘ B -cosΘ} A).

[0044] With reference to FIG. 16, a description will be given of a measuring method of the lead D _14. At the time of the measurement, an illumination guide 35 as an upper illumination means for irradiating from above the drill 10 is used. The Y-axis table 2 is moved along the Y-axis guide by the distance that the drill makes one rotation. Then, the edge coordinate group was measured in the image area s ₇ to form a margin,
By applying the least squares method to this set of coordinates,
To calculate the approximate straight line l _9. The intersection of the approximate line l ₉ with the center line l ₇ described above and the point p _11. Calculating a distance parallel with respect to the Y axis between the point p ₁₁ and the point p ₅ in the measurement of the aforementioned margin width D ₃ as the lead D _14.

A method for measuring the twist angle θ will be described.
From the diameter D ₁ and lead D ₉ , the torsion angle θ is
It is calculated as n ⁻¹ (D ₁ / D ₉ ).

The measurement items from the core thickness to the chisel eccentricity described below are measured by performing image processing on an image taken from a Y-axis television camera 31 installed horizontally with respect to the drill 10. I do.

[0047] First, prior to the measurement of web thickness D ₁₀ and No.2-up depth D _12, with reference to FIG. 17, measured in advance drill center C _2. At the time of measurement, an illumination guide 37 is used as a front illumination means for irradiating from the tip of the drill 10. The captured image is binarized with an arbitrary threshold value, and connected components (regions of continuous white pixels) equal to or larger than the threshold value are recognized as one part. Thereby, as shown in FIG.
Only two flank surfaces of the tip of the drill 10 are extracted. Calculating the barycentric coordinates of the two flank surfaces, which the drill center C _2.

[0048] With reference to FIG. 18, a description will be given of a measuring method of the web thickness D _10. At the time of measurement, an illumination guide 37 is used as a front illumination means for irradiating from the tip of the drill 10. Web thickness D ₁₀ measures and one edge point group b _m on edge group a _n and the other cutting edge on the cutting edge of the drill 10,
Center C ₂ of any point a _p with the aforementioned drill 10 of the points a _n
Distance b point point group to which the shortest _m extension line of a straight line connecting the bets
From calculated (a point b _q), the distance between points a _p and a point b _q d
calculating a _n, this d _n is calculated what is the minimum as the web thickness D _10.

[0049] With reference to FIG. 19, the measuring method of the 2nd up the depth D ₁₂ will be described. When measuring, use a drill 10
Guide 3 as front lighting means for irradiating from the tip of
7 is used. Measuring any point p ₁₂ of the 2nd up portion on the drill periphery. This point p ₁₂ and the distance D ₁₁ between the aforementioned drill center C _2, the radius r (the aforementioned diameter D of the drill
Calculating the difference between the ₁ 1/2) and a No.2-up depth D _12.

[0050] Referring to FIG 20 a method for measuring chisel eccentric D ₁₃ will be described. At the time of measurement, an illumination guide 37 is used as a front illumination means for irradiating from the tip of the drill 10. However, for the measurement of the chisel eccentric D _13, it is necessary to recognize the chisel edge. Therefore, in the illumination guide 37 which can be individually irradiated by being divided into upper and lower portions, the illuminance of each of the upper and lower irradiating means is made different from each other so that the density distribution of the captured images of the two flank surfaces is made different. A chisel edge, which is a boundary, can be easily recognized in image processing. In the image shown in FIG. 20, in the illumination guide 37 which can be illuminated by being divided into upper and lower parts, the illuminance of the lower irradiating means is set to be larger than that of the lower part, so that the right flank of the two flank faces The shading distribution on the flank is large. Therefore, the image area s is located at the center of the drill containing the chisel edge.
Set _8, this in the image area s ₈ measures the edge coordinate group regarding the chisel portion of the drill 10, by applying the least squares method for the coordinate group, to calculate an approximate straight line l _10. And calculates the distance between the approximate line l ₁₀ drill center C ₂ of the above as a chisel eccentric D _13.

Hereinabove, one embodiment of the present invention has been described. In addition, the above-mentioned measurement items are enumerated for explaining the measurement method using the measurement device according to the present invention, for example, the groove length, the groove width, the chisel angle, the cutting edge interval, and the like, the above measurement items Other than the above, it is possible to measure by using the measuring device according to the present invention.

[0052]

According to the first aspect of the present invention, in the measuring device for measuring the dimension and the shape accuracy of the bar-shaped cutting tool, when measuring the shape parameter relating to the outer peripheral portion of the bar-shaped cutting tool, the Y-axis table drive is used. Means is positioned in the axial direction of the rod-shaped cutting tool, and the rotation driving means is positioned about the axis of the rod-shaped cutting tool,
Further, relative positioning between the Z-axis television camera for observing the bar-shaped cutting tool from above and the bar-shaped cutting tool is performed by the Z-axis table driving means, whereby desired image data relating to the outer peripheral portion of the bar-shaped cutting tool is obtained, On the other hand, when measuring the shape parameters relating to the tip of the rod-shaped cutting tool, the rotation driving means positions the rod-shaped cutting tool around its axis, and the Y-axis table driving means observes the rod-shaped cutting tool from the front of the tip. The relative positioning between the Y-axis television camera and the bar-shaped cutting tool is performed so that desired image data relating to the tip of the bar-shaped cutting tool can be obtained. Means and a rotary drive means are controlled in accordance with a predetermined operation program, so that the rod-shaped cutting tool is Only one set-up at the time of holding the became automatically, it shall be able to get all the image data necessary for measuring a plurality of shape parameters easily and quickly.

According to the invention of claim 2, claim 1
In the invention according to the invention, an upper illuminating means configured to irradiate the measurement site with illumination from the same direction as the Z-axis microscope, and to irradiate the measurement site with illumination from the opposite direction to the Z-axis microscope. Lower illumination means, and a front illumination means adapted to irradiate the measurement site with illumination from the same direction as the Y-axis microscope, so that each illumination means can be properly used according to the measurement item. Thus, an optimal photographed image according to the measurement item can be obtained.

According to the third aspect of the present invention, the second aspect is provided.
In the invention according to the invention, the front illuminating means has a substantially ring shape, and has irradiating means capable of irradiating substantially the entire inner peripheral surface of the ring portion toward the center of the ring portion. Since it was made possible to irradiate separately by dividing into the upper part and the lower part of the peripheral surface, when measuring the chisel eccentricity (D ₁₃ ), the irradiation means divided vertically and made individually irradiable By making the illuminance of the irradiating means different between the upper and lower sides, the density distribution of the captured images of the two flank faces is made different, and the recognition of the chisel edge as the boundary is facilitated. Therefore, the recognition accuracy of the chisel edge is improved, and as a result, the measurement accuracy of the chisel eccentricity (D ₁₃ ) calculated based on the chisel edge is also improved.

According to the fourth aspect of the present invention, a second aspect is provided.
In the invention according to the third or third aspect, the front illuminating means is mounted on the A-axis table operable in the direction of the axis by the table driving means. The front lighting means can be arranged at an appropriate position.

In the invention according to claims 5 to 14, the main shape parameters of the drill, that is, the drill diameter (D ₁ ), the tip angle, using the rod-shaped cutting tool measuring device according to any of claims 2 to 4. (Θ ₁ ), lip height (D
₂ ), margin width (D ₃ ), land width (D ₉ ), lead (D ₁₄ ), torsion angle (θ), core thickness (D ₁₀ ), second tapping depth (D ₁₂ ), and chisel eccentricity ( D ₁₃ ) was provided. The image data necessary for measuring each shape parameter is automatically obtained by each of the driving means and the television camera defined in claims 1 to 4 in accordance with an operation program, and the image processing apparatus performs processing based on the obtained image data. Since each shape parameter is automatically measured by the measuring method defined in claims 5 to 14, a plurality of shapes are automatically formed only by one setup when the drill is held by the tool holding means. Parameters can be measured.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a rod-shaped cutting tool measuring device according to the present invention.

FIG. 2 is a front view of the measuring device shown in FIG.

FIG. 3 is a conceptual diagram showing a measurement area related to a rod-shaped cutting tool measuring device according to the present invention.

FIG. 4 is an explanatory view when the drill 10 is mounted on the tool holding means in the rod-shaped cutting tool measuring apparatus according to the present invention.

FIG. 5 is an explanatory view of a photographed image of a tip of a drill, which is photographed using a front illuminating means which is divided into an upper part and a lower part and can be individually irradiated in the measuring device for a bar-shaped cutting tool according to the present invention. It is.

FIG. 6 is a conceptual diagram of a system of a measuring device for a bar-shaped cutting tool according to the present invention.

FIG. 7 is a diagram for explaining a method of adjusting a rotation angle of a drill performed before starting measurement of the drill.

8 is a diagram in which XY coordinates in FIGS. 9 to 14 and 16 are defined (photographed by the Z-axis television camera 32 using the lower illumination means 36).

FIG. 9 is a view for explaining a method of measuring the diameter D ₁ of the drill according to the present invention (using the lower illumination means 36;
Photographed by the Z-axis television camera 32).

It is a diagram for explaining a point angle theta ₁ of the measurement method of the drill in the present invention; FIG (using downward lighting means 36, taken at Z-axis television camera 32).

FIG. 11 is a view for explaining a method of measuring the lip height D ₂ of the drill according to the present invention (the lower illumination means 36).
And shooting with the Z-axis television camera 32).

12 is a first diagram for explaining a method of measuring the margin width D ₃ of the drill according to the present invention (using the above lighting device 35, taken at Z-axis television camera 32).

13 is a second diagram for explaining a method of measuring the margin width D ₃ of the drill according to the present invention (using the above lighting device 35, taken at Z-axis television camera 32).

FIG. 14 is a first diagram for explaining a method of measuring a land width D ₉ of a drill according to the present invention (upper illumination means 3);
5 using the Z-axis television camera 32).

FIG. 15 is a second diagram illustrating the method for measuring the land width D ₉ of the drill according to the present invention.

Is a diagram for explaining the measuring method of the drill of the lead D ₁₄ in Figure 16 present invention (using the above lighting device 35, taken at Z-axis television camera 32).

17 is a diagram for explaining a method of measuring the center C ₂ of the drill according to the present invention (using the front illumination means 37, taken at Y-axis television camera 31).

It is a diagram for explaining a method of measuring web thickness D ₁₀ of the drill in Figure 18 the present invention (using the front illumination means 37, taken at Y-axis television camera 31).

19 is a diagram for explaining a method of measuring the number 2 up depth D ₁₂ of the drill according to the present invention (forward illumination means 37
And shooting with the Y-axis television camera 31).

20 is a diagram for explaining a method of measuring the drill chisel eccentric D ₁₃ of the present invention (using the split irradiation function of the forward illumination means 37, taken at Y-axis television camera 31).

FIG. 21 is a diagram showing names of respective parts of a drill.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Surface plate 2 Y-axis table 3 Tool holding means (work head) 4 Tool holding means (work spindle) 5 Z-axis table 6 Nut 7 Tool holding means (collet) 8 A-axis table 9 A-axis table drive handle 10 Bar-shaped cutting Tool (drill) 21 Y-axis table driving means (Y-axis table driving motor) 22 Rotation driving means (Work spindle driving motor) 23 Z-axis table driving means (Z-axis table driving motor) 24 Work spindle rotation driving belt 31 Y-axis TV camera 32 Z-axis TV camera 33 Y-axis microscope 34 Z-axis microscope 35 Upper lighting means (lighting guide) 36 Lower lighting means (lighting guide) 37 Forward lighting means (lighting guide)

Claims (14)

[Claims] 1. A measuring device for measuring the size and shape accuracy of a rod-shaped cutting tool, wherein the rod-shaped cutting tool is rotatably held around its axis with its rotation axis as an axis, and its rotation angle position is detected. Enabled tool holding means, rotation driving means adapted to rotationally drive the tool holding means around the axis, and mounting the tool holding means to be operable in the direction of the axis. A Y-axis table capable of detecting the displacement amount, a Y-axis table driving unit configured to linearly drive the Y-axis table in the direction of the axis, and the rotation driving unit in a direction of the axis. A Y-axis microscope provided with an objective lens arranged opposite thereto, a Y-axis television camera mounted on the Y-axis microscope, and the bar-shaped cutting tool held by the tool holding means, which is positioned perpendicular to the axis. A Z-axis microscope provided with an objective lens arranged in a direction perpendicular to the Y-axis table so that the Z-axis microscope can be observed from the Z-axis microscope; and a Z-axis television camera mounted on the Z-axis microscope. A Z-axis table capable of operating in a direction perpendicular to the Y-axis table and capable of detecting the amount of displacement thereof; and linearly driving the Z-axis table in a direction perpendicular to the Y-axis table. Z-axis table driving means, and an image which is obtained by processing images taken by the two television cameras to measure a plurality of measurement items relating to the size and shape accuracy of the rod-shaped cutting tool. A measuring device for a rod-shaped cutting tool, comprising: a processing device. 2. An upper illuminating means for irradiating a measurement site with illumination in the same direction as the Z-axis microscope, and irradiating a measurement site with illumination in a direction opposite to the Z-axis microscope. 2. The rod-shaped cutting tool according to claim 1, further comprising: a lower illuminating unit configured to be illuminated; and a front illuminating unit configured to irradiate the measurement site with illumination from the same direction as the Y-axis microscope. 3. Measuring device. 3. The front illuminating means has a substantially ring shape, and has irradiating means capable of irradiating substantially the entire inner peripheral surface of the ring portion toward the center of the ring portion. The measuring device for a bar-shaped cutting tool according to claim 2, wherein the inner peripheral surface is divided into an upper portion and a lower portion, and can be individually irradiated. 4. A bar-shaped cutting tool according to claim 2, wherein said front illumination means is mounted on an A-axis table operable in the direction of said axis by table driving means. measuring device. 5. An image processing apparatus for irradiating a drill as a bar-shaped cutting tool by the lower illumination means, photographing the drill by the Z-axis television camera, and processing the photographed image, wherein a tip of the drill in the photographed image is provided. An arbitrary measurement area is set in the section, the minimum value and the maximum value of the coordinates in the radial direction of the drill in the measurement area are obtained, and the difference between the minimum value and the maximum value is calculated as the drill diameter (D ₁ ). 5. The method according to claim 2, wherein:
A method for measuring a drill using the measuring device according to any one of the above. 6. An image processing apparatus for irradiating a drill as a bar-shaped cutting tool with the lower illumination means, photographing the drill with the Z-axis television camera, and processing the photographed image, A measurement area is set, an edge coordinate group is measured for each of the two cutting edge portions of the drill in the measurement area, and approximate curves (l ₁ ) and (l ₂ ) are obtained for each of the edge coordinate groups. The angle between the _two approximate curves (l ₁ ) and (l ₂ ) is the drill tip angle (Θ ₁ ).
A drill measuring method using the measuring device according to any one of claims 2 to 4, wherein the drill is calculated as: 7. The image processing apparatus according to claim 5, wherein the lower illuminating means irradiates a drill as a bar-shaped cutting tool, photographs the drill with the Z-axis television camera, and processes the photographed image.
A straight line (l ₃ ) passing through the minimum value coordinate point (p ₁ ) and parallel to the Y axis and a straight line (l ₄ ) passing through the maximum value coordinate point (p ₂ ) and parallel to the Y axis, The coordinate points (p ₃ ) and (p ₄ ) of intersections with the _two approximate curves (l ₁ ) and (l ₂ ) according to claim 6 are obtained, and the coordinate points (p ₃ ) are obtained.
And (p ₄₎ and the Y-axis direction difference drill lip height of the (D ₂₎ of the drill using the measuring apparatus according to the so calculated to any one of claims 2 to 4, characterized as Measuring method. 8. The image processing apparatus according to claim 7, wherein the upper illuminating means irradiates a drill as a bar-shaped cutting tool, photographs the drill with the Z-axis television camera, and processes the photographed image.
The center line (l ₇ ) of the drill is determined from the straight lines (l ₃ ) and (l ₄ ) described in (1) above, an arbitrary measurement region is set at the portion of the drill that forms the margin, and the edge that forms the margin in the measurement region The coordinate group is measured, and 2 is calculated from the edge coordinate group.
The two approximate curves (l ₅ ) and (l ₆ ) are obtained, and the coordinate point (p ₅ ) of the intersection of each of the two approximate curves (l ₅ ) and (l ₆ ) with the center line (l ₇ ) is obtained. ) and (p ₆₎ the calculated, the coordinate point (p _5), (p ₆₎ the midpoint of the street the center line of the (calculated vertical linear (l ₈₎ to l _7), the straight line (l ₈₎ (P ₇ ) and (p ₈ ) at the respective intersections of the coordinates and the approximate curves (l ₅ ) and (l ₆ ), and the X-axis direction of the coordinate points (p ₇ ) and (p ₈ ) Difference (D ₄ )
Based helix angle of the drill and (theta), the measurement of the drill using the measuring apparatus according to any one of claims 2 to 4, characterized in that to calculate the drill margin width (D ₃₎ Method. 9. An image processing apparatus for irradiating a drill as a bar-shaped cutting tool with the upper illumination means, photographing the drill with the Z-axis television camera, and processing the photographed image, A coordinate point (p ₉ ) is set at the position of (1), and a leg of a perpendicular drawn from the coordinate point (p ₉ ) to the approximate curve (l ₅ ) according to claim 8 is defined as a coordinate point (p ₁₀ ). Point (p
₁₀ ) and the coordinate point (p ₉ ) on the XY plane (D
_5. The measuring device according to claim 2, wherein a land width (D ₉ ) of the drill is calculated based on the distance (D ₈ ) in the Z-axis direction. Drill measurement method. 10. The Y-axis table is moved on the basis of the measurement position of the margin width (D ₃ ) according to claim 8, by a length substantially equal to the lead length based on the dimensions of the drill as a bar-shaped cutting tool. Then, while irradiating the drill with the upper illuminating means and photographing the drill with the Z-axis television camera, the image processing apparatus for processing the photographed image includes an arbitrary measurement area at a part of the drill forming a margin. set, the edge coordinate group forming a margin in the measurement region is measured to obtain the approximate curve (l ₉₎ from the edge coordinate group, the center of the drill according to claim 8 and the approximation curve (l ₉₎ The coordinate point (p ₁₁ ) at the intersection with the line (l ₇ ) is obtained, and the distance between the coordinate point (p ₁₁ ) and the coordinate point (p ₅ ) according to claim 8 is calculated as a drill lead (D ₁₄ ). Characterized in that A method for measuring a drill using the measuring device according to claim 2. 11. Based on the drill diameter calculated in claim 5 and (D ₁₎ calculated drill leads in claim 10 and (D _14), and characterized in that to calculate the twist angle (theta) A method for measuring a drill using the measuring device according to claim 2. 12. An image processing apparatus which irradiates a drill as a bar-shaped cutting tool with the front illumination means, photographs the drill with the Y-axis television camera, and processes the photographed image. By performing binarization processing using a threshold value, a barycentric coordinate point in a connected element that is equal to or greater than the threshold value is determined as a drill center (c ₂ ). On the other hand, each edge coordinate group (a) on two cutting edges of the drill _m ) and (b _n ) are measured, and a position passing through the drill center (c ₂ ) and minimizing the distance between the two edge coordinate groups is calculated as a drill core thickness (D ₁₀ ). A method for measuring a drill using the measuring device according to any one of claims 2 to 4. 13. An image processing apparatus for irradiating a drill as a bar-shaped cutting tool by the front illumination means, photographing the drill by the Y-axis television camera, and processing the photographed image. The distance (D ₁₁ ) between the coordinate point (p ₁₂ ) of the above and the drill center (c ₂ ) according to claim 12 is obtained, and said distance (D ₁₁ )
The difference between the drill radius (r) obtained from the drill diameter (D ₁ ) according to claim 1 and the drill second depth (D ₁₂ )
The method for measuring a drill using the measuring device according to claim 2, wherein the calculation is performed as: 14. The image processing apparatus according to claim 1, wherein the front illumination means irradiates a drill as a bar-shaped cutting tool, and the Y-axis television camera photographs the drill, and processes the photographed image.
2. A measurement area is set near the drill center (c ₂ ) described in 2 above, an edge coordinate group in the measurement area is measured, an approximate curve (l ₁₀ ) is obtained from the edge coordinate group, and the approximate curve (l
Drilling using the measuring apparatus according to any one of claims 2 to 4, characterized in that the distance between the ₁₀₎ and the drill center (c ₂₎ was calculated as the chisel eccentricity of the drill (D ₁₃₎ Measurement method.