JP2001059713A - Apparatus for measuring bar-like cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for measuring a bar-like cutting tool capable of automatically measuring a shape parameter of the tool when observed from a direction different from a view point of a television camera. SOLUTION: An image processor of the apparatus for measuring a bar-like cutting tool selects a plurality of measuring points necessary to calculate shape parameter to be measured at an image photographed by two television cameras 31, 32, measures a three-dimensional coordinates of the plurality of the points, projects the plurality of the points to a view point coordinate system set based on the designated view point, and processes to measure the parameter at an end of the tool based on the three-dimensional coordinates of the plurality of the points projected to the view point coordinate system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring method in a tool measuring device using an image processing technique for measuring the dimension and shape accuracy of a so-called rod-shaped cutting tool such as a drill and an end mill, and more particularly to a viewpoint of a television camera. The present invention relates to a measurement device for measuring dimensions and shape accuracy when viewed from other than the above.

[0002]

2. Description of the Related Art A so-called bar-shaped cutting tool such as a drill or an end mill used in a machine tool is used in a so-called shape parameter such as a dimension and a shape accuracy in a final inspection process of creation or re-grinding by a tool maker or a machine tool maker. Is measured. For example, when the bar-shaped cutting tool is a drill, the 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 the like. It varies widely depending on the purpose and required accuracy. It should be noted that which measurement item indicates which part of the drill is defined in JIS standards, but is shown in FIG. 13 for reference.

[0003] Regarding the point that these shape parameters are measured by a tool measuring device using image processing technology,
It is also described in Japanese Patent Application No. 10-259155 previously filed by the present applicant.

[0004] That is, in Japanese Patent Application No. 10-259155, a tool for holding a rod-shaped cutting tool so as to be rotatable around an axis with its rotation axis as an axis and capable of detecting its rotational angle position, A rotation driving unit configured to rotationally drive the tool holding unit around the axis, and a Y unit mounted with the tool holding unit and operable in the direction of the axis, and capable of detecting a displacement amount thereof. A Y-axis including an axis table, a Y-axis table driving unit configured to linearly drive the Y-axis table in the direction of the axis, and an objective lens arranged to face the rotation driving unit in the direction of the axis. A microscope, a Y-axis television camera mounted on the Y-axis microscope, and a Y-axis table so that the bar-shaped cutting tool held by the tool holding means can be observed from a direction perpendicular to the axis. -Axis microscope equipped with an objective lens arranged vertically and a Z-axis television camera mounted on the Z-axis microscope, and capable of holding the Z-axis microscope and operating in a direction perpendicular to the Y-axis table As well as
A Z-axis table capable of detecting the displacement amount;
A Z-axis table drive unit configured to linearly drive the axis table in a direction perpendicular to the Y-axis table; and processing the images taken by the two television cameras, thereby obtaining the size and shape of the rod-shaped cutting tool. There is provided an apparatus for measuring a bar-shaped cutting tool having an image processing apparatus configured to measure a plurality of measurement items related to accuracy.

[0005] With this configuration, when measuring the shape parameters relating to the outer peripheral portion of the rod-shaped cutting tool to be measured, the rod-shaped cutting tool is positioned in the axial direction by the Y-axis table driving means, and is rotated. The positioning of the rod-shaped cutting tool around the axis is performed by the driving means, and the relative positioning of the rod-shaped cutting tool and the Z-axis television camera for observing the rod-shaped cutting tool from the direction perpendicular to the axis is performed by the Z-axis table driving means. Thereby, desired image data on the outer peripheral portion of the rod-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, whereby desired image data on the tip of the bar-shaped cutting tool is obtained.

[0006]

In order to obtain high measurement accuracy, it is generally preferable to install a television camera from the viewpoint of the cutting direction of the grindstone that has cut the cut portion. When a cutting tool is manufactured and processed, the cutting direction of the grindstone used for the processing often does not coincide with the axis of the television camera in the measuring device. For example, in processing the groove portion of the drill shown in FIG. 13, a processing machine called a groove heavy grinding machine is used. However, since the groove of the drill has a predetermined torsion angle according to the specification, In addition, the cutting direction of the grindstone in the groove heavy grinder is changed according to the specification of the drill to be machined, and as a result, it does not coincide with the axis of the television camera in the measuring device.

[0007] Therefore, when particularly high measurement accuracy is required or when the rod-shaped cutting tool to be measured has a complicated shape, an arbitrary viewpoint is required so as to cope with the cutting directions of various grinding wheels. Therefore, a measuring device capable of measuring a shape parameter from the above is required. As a measuring device that satisfies such demands, a microscope body or a spindle that holds a rod-shaped cutting tool is installed on a stage that can be moved or rotated manually or automatically, and by operating this stage, the viewpoint of the microscope with respect to the rod-shaped cutting tool is obtained. A form in which the object is moved is conceivable.

However, in such a measuring device, there is a problem that the position of the stage which is manually moved or rotated is inaccurate due to the manual operation and time is required for the measurement, and the stage is automatically moved or rotated. For a rotating object, there is a problem that the measuring device becomes complicated and expensive due to an increase in the number of control axes.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a television set without adding a special mechanism for moving the viewpoint of a television camera to a microscope body or a spindle for gripping a rod-shaped cutting tool. An object of the present invention is to provide a measuring device for a rod-shaped cutting tool that can automatically measure a shape parameter of the rod-shaped cutting tool when viewed from a direction different from the viewpoint of a camera.

[0010]

In order to achieve the above object, according to the present invention, a bar-shaped cutting tool is rotatably held around its axis with its rotation axis as an axis, and its rotation angle position can be detected. Tool holding means, a rotation driving means adapted to rotationally drive the tool holding means around an axis, and a tool holding means mounted thereon, operable in the direction of the axis and detecting the amount of displacement thereof. A Y-axis table which is enabled, a Y-axis table driving means adapted to linearly drive the Y-axis table in the direction of the axis, and an objective lens which is disposed opposite to the rotation driving means in the direction of the axis. Y
The axis microscope, the Y axis television camera mounted on the Y axis microscope, and the bar-shaped cutting tool held by the tool holding means are arranged in a direction perpendicular to the Y axis table so that they can be observed from the direction perpendicular to the axis. With objective lens
A Z-axis microscope, a Z-axis television camera mounted on the Z-axis microscope, and a Z holding the Z-axis microscope and capable of operating in a direction perpendicular to the Y-axis table and detecting the amount of displacement thereof. An axis table and a Z-axis table configured to linearly drive the Z-axis table in a direction perpendicular to the Y-axis table.
Based on the axis table driving means and the images taken by the two television cameras, the shape parameters at the tip of the bar-shaped cutting tool when viewed from viewpoints different from the viewpoints of the two television cameras are measured. And a measuring device for a bar-shaped cutting tool, comprising:

In this configuration, the Y-axis table driving means positions the rod-shaped cutting tool in the axial direction, the rotary driving means positions the rod-shaped cutting tool around the axis, and the Z-axis table driving means moves the rod-shaped cutting tool around the axis. The relative positioning of the Z-axis television camera for observing the cutting tool from the vertical direction of the axis and the rod-shaped cutting tool is performed, whereby a desired outer periphery of the tip of the rod-shaped cutting tool when viewed from the viewpoint of the Z-axis television camera is obtained. Image data is obtained. On the other hand, 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 thereof. As a result, desired image data relating to the tip apex of the bar-shaped cutting tool as viewed from the viewpoint of the Y-axis television camera can be obtained. In the image processing device, based on the image data captured by the two television cameras, the shape parameter at the tip of the rod-shaped cutting tool when viewed from a viewpoint different from each viewpoint of the two television cameras is determined. Measured.

As a specific process in the image processing apparatus, a plurality of measurement points necessary for calculating a shape parameter to be measured in each of images taken by two television cameras are selected, and the plurality of measurement points are selected. Measure the three-dimensional coordinates of each of the measurement points, project the plurality of measurement points on a viewpoint coordinate system set based on a specified viewpoint, and perform measurement of the plurality of measurement points projected on the viewpoint coordinate system. The shape parameters at the tip of the bar-shaped cutting tool are measured based on the three-dimensional coordinates. In the configuration of such an image processing apparatus, Japanese Patent Application No. 10-259155 filed earlier by the present applicant
Can be dealt with by simply modifying the image processing program in the image processing apparatus.

[0013]

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. 11, a groove is cut at the tip of the work spindle 4,
A collet 7 for fixing a drill 10 is fixed to a work spindle 4 with a nut 6, and a drill 1 is attached to the collet 7.
The drill 10 is fixed by attaching 0 and further tightening the nut 6. The drill 10 is rotatably fixed to a predetermined position by the collet 7 with its rotation axis coinciding with the a-axis. And work spindle 4
Is driven by a work spindle driving motor 22 as a rotation driving means. 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 provided coaxially with the rotation axis of the work spindle 4.
It is detected by an angle position detecting means (not shown) such as a rotary encoder.

The upper surface of the surface plate 1 is composed of a well-known guide means such as an ant guide which stands 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 illumination 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, a Y-axis television camera 31 for photographing the tip of the drill 10 and a Y-axis microscope 3 equipped with an objective lens are provided on the upper surface of the surface plate 1 in a direction horizontal to the axis a.
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 a lighting guide 37 as front lighting means adapted to irradiate the drill 10 with light 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.
As a result, as shown in the photographed image of the tip of the drill in FIG. 12, when measuring the chisel eccentricity, the illuminance of the irradiating means is vertically changed by the irradiating means divided vertically and individually irradiable. By making them different, the density distribution of the captured images of the two flank surfaces is made different, and the recognition of the chisel edge, which is the boundary, is facilitated.

The above-mentioned A-axis table 8 on which the illumination guide 37 is mounted can be moved manually by 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 driving means of the A-axis table 8 may be a manual operation using a handle, or may be driven via a ball screw using a pulse motor as in the aforementioned Y-axis table 2 or Z-axis table 5. It may be.

The configuration relating to the mechanical elements of the rod-shaped cutting tool measuring apparatus according to the present invention has been described above. Next, a system configuration for enabling the automatic measurement in the measuring 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 processing 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.

The principle of a method for measuring the shape parameters of the rod-shaped cutting tool from the viewpoints other than the viewpoints of the two television cameras 31 and 32 in the above measuring device will be described. The image taken by the Y-axis television camera 31 is X-
The image taken by the Z plane and Z axis television camera 32 is XY
The planes are respectively configured, and three-dimensional coordinates of an arbitrary point on the drill can be calculated from these two images.
The shape parameter of the drill 10 when viewed from a different viewpoint from each of the two television cameras 31 and 32 is projected onto a coordinate system of a viewpoint for measuring a plurality of points constituting the shape, and the shape is defined in this viewpoint coordinate system. It can be obtained by calculating a parameter.

Here, it is assumed that a point P on the coordinate system photographed by the television camera is projected onto a point P 'on the viewpoint coordinate system rotated by θ degrees around an arbitrary coordinate axis. Regarding the coordinate transformation from the TV camera coordinate system to the viewpoint coordinate system, Z
If θ _Z is around the axis, then in equation (1), θ is around the X axis.
If it is _X , it can be expressed by equation (2).

[0024]

(Equation 1)

Since the rotation about the Y axis corresponds to the rotational movement of the work spindle 4 for gripping the drill 10, there is no need to consider it in the present invention. Furthermore, conversion to an arbitrary viewpoint can be expressed by combining Expressions (1) and (2). By calculating the shape parameters for the point P ′ projected on the viewpoint coordinate system in this way, the shape parameters at the desired viewpoint can be obtained.

Hereinafter, a case in which the grindstone angle is obtained will be described as an example with reference to FIGS. FIG. 5 is a grayscale image of the tip of the drill taken by the Z-axis television camera 32 as viewed from above, and shows a state in which the grindstone performs a thinning process on the drill 10. Here, thinning is
As shown in FIG. 14, a portion where the tip of the web is particularly thin is provided to reduce cutting resistance. Here, L ₁ is the cutting direction of the grinding wheel, in this thinning processing, grinding wheel will cut the drill 10 at an incident angle theta _T with respect to the Y axis.

FIG. 6 is a gray-scale image when the tip of the drill 10 as an object to be measured is viewed from the front (top) by the Y-axis television camera 31. FIG. 7 shows the drill 10
5 is a grayscale image when the tip of is viewed from above by the Z-axis television camera 32. FIG. 9 is an image taken by the Y-axis television camera 31. As shown in FIG. 9, the definition of the grindstone angle is defined by the straight lines _L2C and _L2C when viewed from the direction in which the grindstone is cut.
_This is the angle θ _C with _3C . This is shown in FIG.
This is an operation of rotating the viewpoint by (90−θ _T ) degrees around the Z axis.

Grinding wheel angle θ_CIs the Y axis television camera 31 and Z
Using the image obtained by the axis television camera 32, a straight line L_2A
And L_3AUpper three points P_Four , P_Five , P₆ Measures three-dimensional coordinates of
Then, these three points are obtained by moving the viewpoint.
Can be. Note that the straight line L_2AAnd L _3AUpper three points P_Four , P_Five ,
P₆ Saw the tip of the drill 10 from the front (top)
In FIG. 6, which is a grayscale image at the time,_4A, P
_5A, P_6AAnd the tip of the drill 10
In FIG. 7, which is a grayscale image when viewed from
_4B, P_5B, P_6BIt corresponds to. Wheel angle θ_CAsked for
For the specific procedure, see the flowchart shown in FIG.
This will be described with reference to the chart.

[0029] First, the Z-axis TV camera 32
Measure the edge of the projected image and calculate the angle of incidence θ_TAsk for
You. As described above, the incident angle θ_TIs a straight line L₁And the Y axis
The angle to make. As shown in FIG.₁Is the edge
Upper three points P₁, P_Two, P_ThreeBy measuring the coordinates of
Ask. That is, the work spindle driving motor 22
To rotate the work spindle 4
Then, the drill 10 rotates around the a-axis shown in FIG.
While moving the work spindle 4 stepwise around the a-axis
3 points P₁, P_Two, P_ThreeIs measured and the point P₁And point P
_ThreeAnd the point P_TwoDistance D_nSeeking for this
Perform for a predetermined section around the a-axis, and _nIs minimized
Incident angle θ in coordinates_TTo determine. Note that the edge
The known contour line extraction is performed on the grayscale image shown in FIG.
This can be easily extracted by applying
Can be.

[0030] Next, the Z-axis television camera shown in FIG.
In the 32 images, the point P_4A, Point P _5A, And point P_6ASeat
Measure the target.

[0031] Similarly, in the image of the Y-axis television camera 31, the coordinates of the points P _4B , P _5B , and P _6B are measured.

[0032] , P ₄ and P
_5, the three-dimensional coordinates of the point P ₆ is as shown in equation (3).
In the expression (3), for example, P _4A X is a point P
_It shows the X coordinate of _4A , and the same applies to the others.

[0033]

(Equation 2)

[0034] Next, the incident angle θ_TBased on
As shown in FIG._Four, Point P _Five, Point P₆Each point of
Around the Z axis_Z= (90-θ_T) Degree rotation and point P
_4C, Point P_5C, Point P_6CIs calculated for each point. This calculation
In equation (1), the above equation (1) is applied, and
Can be obtained.

[0035]

(Equation 3)

[0036] Next, based on the coordinates of the three points P _4C , P _5C and P _6C obtained in the coordinate system X′-Z plane after the rotational movement, the straight lines L _2C and L _3C shown in FIG. Ask for. Specifically, since the straight line L _2C is a straight line connecting the point P _4C and the point P _5C and the straight line L _3C is a straight line connecting the point P _5C and the point P _6C , three points P _4C , P _5C , P _6C Can be easily obtained from the coordinates of each point.

[0037] Finally, when the angle between the straight lines L _2C and L _3C obtained in the above is calculated, this is the obtained grinding wheel angle θ _C.

As described above, the method for calculating the grindstone angle in the thinning of the drill has been described as an example. However, according to the above method, various shape parameters of the rod-shaped cutting tool viewed from an arbitrary viewpoint are measured. It is possible to

[0039]

According to the present invention, based on images taken by two television cameras, the shape parameters at the tip of the rod-shaped cutting tool when viewed from viewpoints different from the viewpoints of the two television cameras. The same measurement result as that obtained when a TV camera is installed in the cutting direction of the grindstone that cuts the relevant cutting part will be obtained, and as a result, the cutting of the grindstone High measurement accuracy can be obtained without adding a special mechanism for moving the television camera in the direction.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a measuring device for a bar-shaped cutting tool 10 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 measuring device of the bar-shaped cutting tool 10 according to the present invention.

FIG. 4 is a system conceptual diagram of a measuring device of the bar-shaped cutting tool 10 according to the present invention.

FIG. 5 is a gray-scale image of the tip of the drill 10 taken from above by the Z-axis television camera 32 according to the embodiment of the present invention, showing a state in which the grindstone performs thinning processing on the drill 10; ing.

FIG. 6 is a grayscale image when the tip of the drill 10 is viewed from the front (ascending part) by the Y-axis television camera 31 in one embodiment of the present invention.

FIG. 7 is a gray-scale image when the tip of the drill 10 is viewed from above with a Z-axis television camera 32 in one embodiment of the present invention.

FIG. 8 is a conceptual diagram of viewpoint movement in one embodiment of the present invention.

FIG. 9 is an image photographed by a Y-axis television camera 31 according to an embodiment of the present invention, and shows the definition of a grinding wheel angle.

FIG. 10 is a flowchart in a case of obtaining a grindstone angle according to an embodiment of the present invention.

FIG. 11 is an explanatory view when the drill 10 is mounted on the tool holding means 7 in the measuring apparatus according to the present invention.

FIG. 12 shows that the illuminance is different between the upper and lower portions by using the divided irradiation function of the illumination guide 37, so that the density distribution of the two flank surfaces in the image taken by the Y-axis television camera 31 is different. This shows a captured image in which a chisel edge as the boundary is extracted.

FIG. 13 is a diagram showing names of respective parts of the drill 10.

FIG. 14 is a diagram showing thinning of the drill 10.

[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 (2)

[Claims] 1. A tool holding means for holding a rod-shaped cutting tool rotatably around its axis with its rotation axis as an axis, and capable of detecting the rotation angle position thereof, and connecting said tool holding means to said axis. A rotation driving unit configured to be rotationally driven, a Y-axis table on which the tool holding unit is mounted and operable in the direction of the axis, and a displacement amount thereof can be detected; A Y-axis table drive unit configured to linearly drive a table in the direction of the axis, a Y-axis microscope including an objective lens arranged to face the rotary drive unit in the direction of the axis, and the Y-axis microscope And a Y-axis television camera mounted on the Y-axis table, and the bar-shaped cutting tool held by the tool holding means is arranged in a direction perpendicular to the Y-axis table so as to be observable from a direction perpendicular to the axis. A Z-axis microscope equipped with an objective lens, a Z-axis television camera mounted on the Z-axis microscope, and a Z-axis microscope that holds the Z-axis microscope and is operable in a direction perpendicular to the Y-axis table. A Z-axis table capable of detecting a displacement amount; a Z-axis table driving unit configured to linearly drive the Z-axis table in a direction perpendicular to the Y-axis table; and photographing by the two television cameras. An image processing apparatus configured to measure a shape parameter at a tip portion of the rod-shaped cutting tool when viewed from a viewpoint different from each viewpoint of the two television cameras based on the obtained image. A measuring device for a bar-shaped cutting tool, characterized in that: 2. The image processing apparatus according to claim 1, further comprising: selecting a plurality of measurement points necessary for calculating a shape parameter to be measured in each of the images taken by the two television cameras; Measuring respective three-dimensional coordinates, projecting the plurality of measurement points on a viewpoint coordinate system set based on a designated viewpoint, and three-dimensional coordinates of the plurality of measurement points projected on the viewpoint coordinate system 2. The apparatus for measuring a rod-shaped cutting tool according to claim 1, wherein the shape parameter of the rod-shaped cutting tool is measured based on the following.