JP2002219633A - Device for inspecting edge of fine cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for inspecting a cutting tool with an edge width of 0.05-0.5 mm. SOLUTION: This inspection device 10 is formed by a microscope 30 incorporating a zoom mechanism 31 with a magnifying power of over 300 and comprising a CCD camera 32, a microscope support member 40 for supporting the microscope 30, a processing unit 35 for processing electric information of the CCD camera 32 and converting it into image information, a flat display 50 displaying graphically the image from the processing unit 35 and having a flat display screen 51, and a transparent gauge plate 60 detachably stuck to the display screen 51. Accordingly the cutting tool with the edge with of 0.05-0.5 mm can be inspected and an image of the cutting tool to be observed can be displayed on the flat display for being seen by plural persons at the same time, and thereby necessary techniques such as how to look at or grind the cutting tool can be efficiently transmitted if one is an instructor and the rest are learners.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cutting edge width of 0.05 to
It is suitable for the inspection of the edge of a 0.5 mm fine cutting tool.
The present invention relates to an apparatus for inspecting the cutting edge of a fine cutting tool capable of measuring up to 001 mm.

[0002]

2. Description of the Related Art FIGS. 10A and 10B show JIS B4.
It is a side view of the usual end mill prescribed by 211. (A) shows a normal square end mill 101 with a sharp edge, (b) shows a normal ball end mill 102 with a spherical edge, and in the figure, D is the edge width.

[0003] A thin end mill is an extremely small one like a file of a dental drill. The end of a round bar having an outer diameter of about 2 mm is sharpened like a pencil and a cutting edge is formed at the end. As a commercial product, the minimum value of the blade edge width D is 0.2 m
m are in practical use.

[0004] In recent years, the cavity shape of precision resin molding dies has become increasingly finer, and a thinner end mill has been required to achieve this. That is, in order to perform finer machining, an end mill (fine end mill) having a smaller blade edge width has been required.

[0005]

However, a major factor that hinders further miniaturization of the end mill is the inspection device for the cutting edge. Conventionally, a 50x monocular (or binocular) microscope has been used for the inspection of the cutting edge of this type of cutting tool through an 8x loupe used by a watch repairman.

FIGS. 11A and 11B are principle diagrams of a conventional monocular microscope. As shown in FIG.
Is an objective lens 112 and a scaled glass plate 1
13. The eyepiece 114 is attached in series, and the
5 is an inspection tool that can be viewed, for example, at 50 times magnification. (B) is a view on arrow bb of (a), that is, a plan view of the scaled glass plate 113. The scaled glass plate 113 is obtained by engraving or printing a concentric scale 116 on a transparent glass plate. is there.

FIG. 12 is an enlarged view of the scale of a conventional glass plate with a scale. The width (thickness) t of a line 117 constituting the scale 116 is 0.01 mm in increments or the limit of printing (production limit). Yes, so lines 117 and 117
The production limit of the pitch p is 0.1 mm.

Incidentally, not only the object to be inspected but also the line 11
7, 117 are also enlarged by the eyepiece of FIG.
As the magnification increases, the width of the line increases and the outline becomes unclear. This is the same as enlarging the outline of a character (font) struck by a dot printer. For this reason, the magnification cannot be increased so much, and a magnification of about 50 times is commonly used.

[0009] If you look at, for example, 0.1 mm at a magnification of 50, you can see an image of 5 mm (50 x 0.1 = 5 mm). To measure the length and angle accurately in an image of this size, Requires skill, poor productivity, not practical.
Therefore, as described above, the edge width D of the commercially available product is 0.2
mm is the limit.

Conversely, it can be said that the fact is that end mills having a blade edge width of 0.5 mm or more have conventionally been the mainstream, and there has been no inconvenience with a tool microscope of about 50 times.

However, the demand for finer end mills is not limited, and fine end mills of 0.1 mm less than 0.2 mm, more preferably 0.05 mm, preferably 0.03 mm
An ultra-fine end mill having a cutting edge width of mm has been desired. Therefore, an object of the present invention is to provide a technique capable of providing a cutting tool having a blade edge width of 0.05 to 0.5 mm.

[0012]

According to a first aspect of the present invention, there is provided an apparatus for inspecting the cutting edge of a fine cutting tool, wherein the width of the cutting edge is set to be equal to or less than 0.1.
A microscope equipped with a cutting tool set base on which a fine cutting tool of 0.5 to 0.5 mm can be set, a built-in zoom mechanism having a magnification of more than 300 times, and a solid-state imaging device camera for converting optical information into electrical information; A microscope support member that supports the microscope so that the tip of the microscope faces the cutting tool set base, a processing unit that processes electrical information from the solid-state imaging device into video information, and displays and displays information from this processing unit on a video basis The flat display has a flat surface, and a transparent gauge plate removably attached to the display surface of the flat display.

If a blade having a blade width of 0.05 mm is zoomed up by a factor of 600, an image of a blade having an apparent size of 30 mm can be displayed on a flat display. By superimposing the transparent gauge plate on the apparent (enlarged image) 30 mm blade edge image, the measurement of the blade edge width, the confirmation of the shape, and the like can be performed visually by the observer. It is easy to make the scale of the line on the transparent gauge plate 0.1 mm in line thickness and 1 to 5 mm in pitch between lines by using a usual technique for making a ruler for school children. Needless to say, it is possible to measure an apparent size of 30 mm with high accuracy with such a scale.

That is, in the present invention, a scale plate is disposed between an objective lens and an eyepiece lens, but in the present invention, the scale is observed closer to an observer than the eyepiece lens, specifically, from a solid-state imaging device replacing the eyepiece lens. A transparent gauge plate instead of a scale plate is arranged on a flat display closer to the elderly. As a result, the thickness and pitch of the scale lines attached to the transparent gauge plate can be easily determined, and the transparent gauge plate can be made very inexpensive. Then, various kinds of inexpensive transparent gauge plates may be prepared and replaced according to the observation target.

In the present invention, the transparent gauge plate is required to have a linear scale used for measuring a magnification and a length, and a hatched scale used for measuring a taper angle of a tip of a cutting tool which is sharpened conically. As a selection item, a concentric scale used when measuring the diameter of the ball of the ball end mill is set as a selection item, and at least one selection item is added to a required item.

The linear scale is useful for measuring length, distance, and width. Among the fine blades, the fine end mill needs to measure the taper angle at the tip of the blade in both the square end mill and the ball end mill. In addition, the ball end mill needs to measure the ball diameter. Therefore, the inspection efficiency can be increased by using a transparent gauge plate provided with a linear scale as a base and appropriately adding both or one of the inclined scale and the concentric scale.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Since the azimuth lines x and y need to be explained, they are described in the margins of the figure. FIG. 1 is a configuration diagram of an apparatus for inspecting a blade edge of a fine blade according to the present invention. The blade edge inspection apparatus 10 for a micro blade is a blade tool set capable of setting a micro blade 11 having a blade edge width of 0.05 to 0.5 mm. Table 20,
Magnification exceeding 300 times (about 300 to 300 times in the embodiment)
A microscope 30 having a built-in zoom mechanism 31 having a magnification of 0) and a solid-state imaging device camera (CCD camera) 32 for converting optical information into electrical information, and a tip 33 of the microscope facing the blade set base 20. A microscope supporting member 40 for supporting the microscope 30, a processing unit 35 for processing the electrical information of the solid-state imaging device camera 32 and converting the information into video information, displaying the information from the processing unit 35 in a video image and a flat display surface 51. A certain flat display 50
And a transparent gauge plate 60 removably attached to the display surface 51. 61, 61 are transparent tapes with an adhesive which are easy to remove.

Although a grinding machine is omitted because the drawing becomes complicated, a grinding machine with an inspection device can be obtained by attaching the grinding machine to the device base 21. Specifically, the grindstone can be moved laterally to the tip 33 of the microscope, and after grinding with the grindstone, the grindstone is put on standby, the cutting tool is inspected, and the inspection and grinding are performed as in the case of grinding with the grindstone. Perform alternately. Conventionally, the cutting tool is removed from the grinder, the cutting tool is inspected with a tool microscope, and the cutting tool is mounted on the grinder for grinding. In this regard, according to the present invention, it is not necessary to remove the cutting tool, so that grinding can be performed efficiently.

The cutting edge inspection device 10 will be described in detail. The cutting tool set base 20 has a device base 21 on which a y-direction slider 22 movable along the y-axis is mounted, and moves the y-direction slider 22 and the movement at that time. The y-direction movement knob 24 provided with a digital counter 23 (0.001 mm of the first scale) for measuring the amount can be moved by rotation, and the y-direction slider 22 can be moved along the x-axis by such a y-direction slider 22. A slider 25 is placed, and this x-direction slider 2
5 is moved and the x-direction moving knob 27 provided with a digital counter 26 (0.001 mm of the first scale) for measuring the moving amount at that time can be moved by rotation.
A horizontal spindle 28 is rotatably mounted on such an x-direction slider 25, a chuck 29 for gripping the cutting tool 11 is mounted on a tip of the horizontal spindle 28, and a rotary knob 28a is mounted on a rear end of the horizontal spindle 28. is there.

The microscope support member 40 has a slide block 42 attached to a support column 41 erected on the apparatus base 21, and the slide block 42 is mounted at an arbitrary height on the lock bolt 4.
The upper and lower arms 44, 45 are attached to the slide block 42 so as to be vertically slidable, and the microscope 30 is supported by the upper and lower arms 44, 45. By turning the focusing knob 46, the microscope 3
Zero focus can be achieved. The structure of the microscope support member 40 is not limited to the structure shown in the drawing as long as it can support the microscope 30.

In the present invention, a general display having a curved display surface is not used. This is because the image is distorted around the display and does not match the scale of the transparent gauge plate 60 described later. Therefore, the present invention employs the flat display 50 in which the display surface 51 is a flat (including substantially flat) surface.

FIG. 2 is a view showing a transparent gauge plate according to the present invention. The transparent gauge plate 60 has a resin transparent plate 62 and a magnification character 63 and linear scales 64 and 65 used for measuring the length. The diagonal scale 66 used when measuring the taper angle of the tip of the cutting tool which is sharpened in a conical shape is selected, and the concentric scale 67 used when measuring the diameter of the ball of the ball end mill is selected.

The zoom mechanism 31 shown in FIG. 1 is engraved with a scale 34 for indicating a magnification, so that the approximate magnification can be set. However, this magnification should be accurate. Further, since the transparent gauge plate 60 can be easily replaced, it may be different from the zoom magnification. Therefore, it is necessary to confirm these as an initial check.

FIGS. 3A to 3C are explanatory diagrams for confirming that the zoom magnification matches the magnification of the transparent gauge plate. In (a), first, the image 12 of the cutting tool is displayed on the display surface 51.
And move the image 12 in the x direction (turn the x direction movement knob 27 in FIG. 1). The transparent gauge plate 60 is attached to the display surface 51 while making the linear scale 64 coincide with the movement locus of the image 12.

Next, the origin 68 of the transparent gauge plate 60
Then, for example, the tip of the image 12 is adjusted in the manner of an arrow. Then, the x-direction digital counter 26 shown in (b) is reset to “0.000”. Returning to (a), the blade image 12 is moved along the x-axis as indicated by an arrow, for example, by three graduations (0.03 mm). At this time, the x-direction digital counter 26 is read, and "0.03
If it is "0", the zoom magnification matches the magnification character on the transparent gauge plate. If they do not match, the zoom magnification may be finely adjusted and checked again.

What is important here is that if the magnification character 63 and the linear scale 64 are marked on the transparent gauge plate 60, it is possible to not only calibrate the zoom magnification but also measure the length of the cutting tool. is there. Fig. 3 shows the width of the cutting edge, which is important for cutting tools.
Measurement can be easily performed in the manner of (a) to (c).
Therefore, the transparent gauge plate 60 of the present invention is preferably shown in FIG. 2, but may be simply shown in FIG. 3 (a).

FIGS. 4 (a) to 4 (d) are process diagrams of the material processing of the fine cutting tool according to the present invention. As shown in (a), for example, a material 71 having a diameter of 2.0 mm is prepared. As long as the material is a material commonly used as a cutting tool such as a carbide, the type of the material does not matter. This material 71 is made to protrude like a pencil with a grinding machine. (B) shows the 1st intermediate material 73 whose front-end | tip became the conical part 72. FIG. The conical portion 72 is halved with a grinding machine.
(C) shows the second intermediate member 74 whose tip is a half-cone. (D) is a view taken in the direction of the arrow d in (c), and the cut flat surface becomes the rake face 75. The second intermediate member 74 is further modified to produce a fine square end mill or a fine ball end mill. This point will be described below.

FIGS. 5A to 5D are views showing the processing steps of the fine square end mill. FIG. 4A is an enlarged view of FIG. 4D, and the tip of the second intermediate member 74 is cut off along a processing line 76. (B) shows the third intermediate member 77 whose tip is cut off. (C) is a cross-sectional view taken along line c of (b). A first flank 79 is formed along a processing line 78, and a bottom blade 80 is attached to a corner between the rake surface 75 and a cutting line 81. A second flank 82 is formed along the flank. (D) is a sectional view taken along the line d of (b), in which a circumferential first flank 84 is formed along a processing line 83, and a side blade 85 is attached to a corner between the rake surface 75 and the processing line. A circumferential second flank 87 is formed along 86. Thus, a square end mill can be obtained.

FIG. 6 is a diagram for explaining how to use the diagonal scale and the concentric scale of the transparent gauge plate of the present invention. The usage of the concentric scale 67 will be described later. The taper angle (for example, 15 degrees) can be read by superimposing the side blade 85 at the tip end of the cutting tool of the square end mill on the diagonal scale 66. However, an angle error occurs on the diagonal scale 66 depending on how the transparent gauge plate is attached. Therefore, although it takes some time, another angle measurement method is prepared in the present invention.

FIGS. 7A to 7F are explanatory views of another angle measuring method according to the present invention. In (a), first, the side blade 85 of the cutting tool is aligned with the origin 68. Then, in (b), y
The digital counter 23 on the X side and the digital counter 26 on the x side are reset to “0.000”. In (c), the scale of the digital counter 23 on the y side is adjusted to, for example, “0.015”. This operation can be performed by turning the y-direction movement knob 24 in FIG. (D) shows the display of the digital counters 23 and 26 at that time.

In (e), the side blade 85 on the display surface is moved to the right to match the origin 68. This operation is performed as shown in FIG.
This operation is performed by turning the direction moving knob 27. It is not necessary to read the scale of the digital counter 26 on the x side during this movement. When the side blade 85 overlaps the origin 68, the numerical value of the x-side digital counter 26 (for example, “0.00
4)) is read.

As shown in (g), the side blade of the cutting tool is y (0.
015 mm) and then x (0.004 m
m) Since it has moved to the right, the resulting angle θ is tan θ = 0.004 / 0.015 = 4/15
= 0.2666, θ = 15 °. In FIG. 6, if the angle is simply obtained, and finally a precise angle is calculated by the trigonometric operation shown in FIG. 7, the taper angle can be efficiently measured and finished.

FIG. 8 is a view showing how to check the finish of the flank using the transparent gauge plate of the present invention. The image 12 of the cutting tool shown on the display surface 51 is turned as indicated by an arrow (the turning knob 28a in FIG. 1 is turned). Then, the trajectory of the side blade 85 moving rightward as indicated by the arrow can be visually observed. If this movement is smooth, the circumferential first flank 84 and the circumferential second flank 87 shown in FIG. 5D can be formed as specified.
If the movement trajectory does not move to the right as indicated by the arrow in the figure, the flank surfaces 84 and 87 need to be re-worked because the tool may be damaged.

FIGS. 9A to 9C are views showing the processing steps of a fine ball end mill. FIG. 4A is an enlarged view of FIG. 4D, and the tip of the second intermediate member 74 is rounded along a processing line 88. (B) is a third intermediate member 7 having a rounded tip.
7 is shown. (C) is a sectional view taken along the line c of (b), in which a first flank 91 is formed along a processing line 89, and a bottom blade 80 is attached to a corner between the rake surface 75 and the processing line 93. A second flank 94 is formed along the flank. Thus, a fine ball end mill can be obtained.

Returning to FIG. 6, the tip 9 of the ball end mill
By adjusting 5 to the concentric scale 67, the diameter of the ball of the ball end mill can be measured.

The cutting edge inspection apparatus 10 of the present invention is suitable for inspection of a fine end mill (square end mill, ball end mill).
It can be applied to the inspection of a normal end mill as shown in (b) and other fine cutting tools such as drills, reamers, cutting tools and broaches. Further, in the first aspect, the blade edge width is 0.1 mm.
Although the target is a blade tool of 0.5 to 0.5 mm, if the zoom magnification is increased, it is possible to measure up to 0.001 mm.
Therefore, the inspection object may be 0.05 mm or less.

[0037]

According to the present invention, the following effects are exhibited by the above configuration. The first aspect of the present invention is characterized in that a transparent gauge plate instead of the scale plate is arranged closer to the observer than the eyepiece, specifically, on a flat display closer to the observer than the solid-state imaging device replacing the eyepiece. As a result,
The thickness and pitch of the scale lines attached to the transparent gauge plate can be easily determined, and the transparent gauge plate can be made very inexpensive. Then, various kinds of inexpensive transparent gauge plates may be prepared and replaced according to the observation target.

In the microscope described in the prior art,
Only the observer can see the test object, others cannot see at the same time. Therefore, conventionally, an observer draws an image on paper, and the image on the paper explains to others. As a result, education for fine cutting tools becomes inefficient, and learning of fine cutting tools has conventionally been extremely difficult.
In this regard, in the present invention, the image of the cutting tool to be observed can be displayed on a flat display, and this image can be viewed by a plurality of persons at the same time. You can pass on necessary techniques such as how to look at and how to grind.

According to the present invention, the transparent gauge plate is required to have a linear scale used for measuring the magnification and the length, and a hatched scale used for measuring the taper angle of the tip of the cutting tool which is sharpened conically. As a selection item, a concentric scale used when measuring the diameter of the ball of the ball end mill is set as a selection item, and at least one selection item is added to a required item.

The linear scale is useful for measuring length, distance, and width. Among the fine blades, the fine end mill needs to measure the taper angle at the tip of the blade in both the square end mill and the ball end mill. In addition, the ball end mill needs to measure the ball diameter. Therefore, the inspection efficiency can be increased by using a transparent gauge plate provided with a linear scale as a base and appropriately adding both or one of the inclined scale and the concentric scale.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a device for inspecting a blade edge of a fine blade tool according to the present invention.

FIG. 2 is a diagram of a transparent gauge plate according to the present invention.

FIG. 3 is an explanatory view for confirming that the zoom magnification matches the magnification of the transparent gauge plate.

FIG. 4 is a process diagram of the material processing of the fine blade tool according to the present invention.

FIG. 5 is a processing diagram of a fine square end mill.

FIG. 6 is an explanatory diagram of how to use a diagonal scale and a concentric scale of the transparent gauge plate of the present invention

FIG. 7 is an explanatory view of another angle measuring method according to the present invention.

FIG. 8 is a procedure for confirming the finish of a flank using the transparent gauge plate of the present invention.

FIG. 9 is a processing diagram of a fine ball end mill.

FIG. 10 is a side view of a normal end mill specified in JIS B 4211.

FIG. 11 is a principle diagram of a conventional monocular microscope.

FIG. 12 is an enlarged view of a scale of a conventional glass plate with a scale.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 10: blade tip inspection device for fine blade, 11: blade, 12: blade image, 20: blade set table, 30: microscope, 31: zoom mechanism, 32: solid-state imaging device camera (CCD camera), 33: tip of microscope , 35 processing unit, 40 microscope support member, 50 flat display, 51 display surface, 60 transparent gauge plate, 63 magnification characters, 6
4, 65: linear scale, 66: inclined scale, 67: concentric scale, 68: origin.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hajime Tsunoi 3-5-1 Maesawa, Higashi-Kurume-shi, Tokyo Limited term Mitsui carved seal F-term (reference) 2F065 AA21 AA26 AA36 CC10 EE00 FF61 FF67 JJ03 JJ26 LL06 PP02 PP05 PP12 PP24 QQ51 SS02 SS13 3C029 EE14 EE20

Claims (2)

[Claims] 1. A built-in cutting tool set table on which a fine cutting tool having a blade edge width of 0.05 to 0.5 mm can be set, and a zoom mechanism having a magnification of more than 300 times are built in, and optical information is converted into electric information. A microscope equipped with a solid-state imaging device camera, a microscope support member that supports the microscope so that the tip of the microscope faces the blade set table, and a processing unit that processes electric information from the solid-state imaging device into video information, An apparatus for inspecting the cutting edge of a fine cutting tool, comprising: a flat display, which displays information from the processing section as an image and has a flat display surface, and a transparent gauge plate detachably attached to the display surface of the flat display. The transparent gauge plate is required to have a linear scale used for measuring magnification and length, and a diagonal scale used for measuring a taper angle of a tip of a cutting tool which is sharpened conically. The micro cutting tool according to claim 1, wherein a concentric scale used when measuring the diameter of the ball of the ball end mill is selected, and at least one selected item is added to the essential items. Cutting edge inspection device.