JP4187397B2 - Cutting blade - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat blade-shaped cutting blade used in a cutting apparatus or the like, and more particularly to a cutting blade for cutting a thin plate-shaped substrate such as a ceramic green sheet.
[0002]
[Prior art]
There is a cutting apparatus suitable for cutting a thin plate-like substrate (material plate) such as a ceramic green sheet before sintering into a grid pattern or the like to obtain a plurality of cutting chips. In this type, a flat blade-like cutting blade is pressed against a workpiece in a so-called guillotine type at a predetermined interval (pitch feed), and the cutting blade used is sharp when viewed from the front. A V-shaped blade surface is used.
By the way, this type of cutting blade is detachably attached to a tool holder that can be moved up and down in a cutting apparatus (not shown), and a centering camera is mounted on the support of the tool holder, and a predetermined amount of pitch is fed. Each time a pair of opposing linear marks attached at equal intervals to the edges of the workpiece (or four edges if a rectangular workpiece) are imaged with a centering camera, the image is further processed and centered, After correcting the index table for attracting and holding the workpiece with the correction amount, the cutting blade is lowered to cut the workpiece. This is repeated each time a predetermined pitch feed in the length direction of the work is completed, and when this is completed, the work is rotated 90 degrees on the index table and cut in the same manner. As a result, a cutting tip is obtained.
At this time, the four-edge portion with the linear mark is not suitable as a cutting tip because the linear mark remains. For this reason, the work to be cut is cut into a grid pattern while leaving a border in a frame shape.
[0003]
[Problems to be solved by the invention]
By the way, for example, the vertical and horizontal dimensions are set to 0.6 (mm) × 0.3 (mm) while maintaining the processing accuracy by pressing the work in a guillotine manner with the cutting blade formed by the blade surfaces of the two blades as described above. In order to cut such a fine cutting chip, it is necessary to minimize the edge angle and prevent the workpiece cutting surface from being deformed to the minimum. Therefore, this type of cutting blade has a cutting edge angle of about 10 to 30 degrees and a shank thickness of about 1 mm.
However, if the blade edge angle is made smaller without changing the blade thickness (thickness of the shank), the area of the left and right blade surfaces (cutting function portion) is naturally increased, and both the left and right surfaces are large when cutting. There is a problem that resistance becomes large and a large cutting force is required at the time of cutting, and as a result, the cutting edge portion undergoes buckling deformation.
[0004]
The present invention has been made in view of the conventional circumstances, and an object of the present invention is to provide a flat blade-shaped cutting blade having a high buckling strength and good sharpness at the edge portion even at a fine desired edge angle. There is.
[0005]
[Means for Solving the Problems]
As a technical means taken in order to achieve the above object, a flat blade-like cutting blade for cutting a thin plate-like workpiece, the cutting function portion formed from the tip toward the shank portion is formed with respect to the center line. a cutting edge which is formed a predetermined length at a concave curved surface symmetrical, symmetrical concave curved surface with respect to the said and the cutting edge portion to be thicker toward the shank portion is formed over the shank portion center line constituted by the in-formed connecting portions, and in該連portion, concave curved surface to be continuously provided to the cutting edge portion, the middle a thin Do portion than the maximum thickness of the concave curved surface of the cutting edge characterized in that it is a concave curved surface gradually that a thicker after forming the. Further, the continuous portion is formed of a plurality of steps of concave curved surfaces, and each of the upper concave curved surfaces has a portion that is thinner than the maximum thickness of the lower concave curved surface that is continuous with the upper concave curved surface. It is a concave curved surface that gradually increases in thickness after being formed in the middle.
[0006]
According to the above technical means, the concave and curved surface that is symmetrical to the left and right is formed so that the connecting portion connecting the blade edge portion and the shank portion gradually increases in thickness from the rear edge (upper end) of the blade edge portion toward the shank portion. In addition to suppressing the contact resistance given to the workpiece by the connected portion during cutting, the cutting angle is the first angle, the upper curved surface is the second angle, the third angle, and so on. In this case, each of the upper concave curved surfaces is formed with a portion that is slightly thinner than the lower step angle in the middle and then gradually thickened, so that the second angle with respect to the edge portion that is the first corner The contact with the blade (contact with the workpiece) with respect to the workpiece of the left and right symmetrical concave curved surface is lower. This is the same condition for the upper number for each number. Therefore, the cutting resistance is further suppressed, and the workpiece can be cut with a small cutting force, which contributes to the prevention of buckling deformation of the cutting edge portion.
[0007]
Further, the concave curved surface of the concave curved surface and connecting portions of the cutting edge, characterized in that it is ground formed over the wales of fine irregularities striatum curved in the same direction in the blade length direction entire length .
[0008]
According to the technical means, in addition to the first aspect, it is cut so as to be cut by the fine uneven lines of the vertical lines, and the sharpness is improved.
[0009]
Further, the left and right surfaces of the blade edge portion are made flat instead of the concave curved surface, the flat surface is mirror-finished, and fine concave and convex linear stripes in the same direction as the curved surface direction are formed on the concave curved surface of the connecting portion. It is characterized in that it is formed by grinding over the entire length in the direction.
[0010]
According to the technical means, in addition to the operation of the first aspect, the cut surface is beautiful.
[0011]
As the material of the cutting blade, a cemented carbide material is suitable, and the wear resistance of the cutting blade formed in a shape with high buckling strength can be improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show the present embodiment, in which 1 is a cutting blade.
[0013]
The cutting blade 1 includes a flat shank 21 part and a cutting function part 11 that performs cutting and increases buckling strength.
The cutting function part 11 in FIG. 1A is formed so as to gradually increase in thickness from the tip part toward the shank part 21, and has a predetermined length with a concave curved surface 11 a ′ that is symmetrical with respect to the center line X. In addition, a concave portion symmetrical to the center line X is formed continuously over the blade edge portion 11a and the shank portion 21 so as to gradually increase in thickness toward the shank portion 21 and the blade edge portion (first angle) 11a having a desired blade edge angle. It is comprised from the one-stage connection part 11b formed by curved surface (2nd angle | corner) 11b 'and 11b'.
The cutting blade 1 is made of a highly brittle cemented carbide material, and the concave curved surfaces (second angle) 11b ′ and 11b ′ forming the blade edge portion (first corner) 11a and the connecting portion 11b are in the curved surface direction. In the same direction, it is ground by a grinding wheel having a grinding surface on the circumferential surface and formed with the same curvature as that of the grinding wheel, whereby the cutting edge (first angle) 11a and the connecting portion 11b are both ground. By processing, fine concavo-convex filaments 31 (see FIG. 2) are formed over the entire length in the blade spanning direction.
Further, the cutting blade 1 has concave curved surfaces (second corners) 11b ′ and 11b ′ provided continuously with respect to the blade edge portion (first angle) 11a and is slightly thinner than the blade edge portion (first angle) 11a. The left and right symmetric concave curved surfaces 11b 'and 11b' are gradually thickened after forming such a portion in the middle.
This is to further reduce the resistance of the concave curved surfaces (second angle) 11b ′ and 11b ′ that come into contact with the workpiece W when cutting the workpiece.
Further, as shown in FIG. 2, the V-shaped surfaces 41 and 41 are formed by forming the full height of both ends in the blade-crossing direction in a V shape in plan view.
FIG. 4 shows a phenomenon at the time of cutting exerted by a conventional cutting blade having an elongated rectangular cross-sectional shape in the spanning direction.
This phenomenon has a particularly adverse effect when the cutting chip C (chip after cutting) has a very small vertical and horizontal dimension of 0.6 (mm) × 0.3 (mm).
That is the spread S at both ends when the workpiece W is cut by trial between the linear marks M and M (FIG. 4A).
The cause of this is unknown, but since the cross-sectional shape of the cutting function part is a horizontally long rectangular shape, the work W is torn at two corners perpendicular to the blade surface and the end surface, and when cutting with the blade surface (both left and right) It is expected that the elastic force of compression acts in the span direction and appears as a spread S.
Due to the spread S, as shown in FIG. 4 (b), when the chip (C) is obtained by cutting the work (ceramic grease sheet) W into a grid pattern while leaving a border in the shape of a frame, Opposing cutting chips C are changed in the direction of inclination, thereby pushing the already cut cutting chip C, and the reaction of the chip C and the cutting chip C that has been cut off or overturned. Cause.
[0014]
As described above, in the first embodiment in which both ends of the cutting function portion 11 in the blade crossing direction are formed by the V-shaped surfaces 41 and 41 in plan view, the blade surfaces 11a ′ and 11b ′ and the V-shaped surface 41 as the cutting function portion 11 are formed. Since each of 41 is connected with an obtuse angle, the phenomenon of tearing the ceramic work W at both ends is suppressed. For this reason, even if the compression elastic force at the time of cutting acts in the direction across the blade, it does not appear as a spread S, and the cutting tip does not fly or fall as shown in FIG. 4B. .
Incidentally, as shown in FIG. 3, even if at least both ends of the cutting function portion 11 in the blade spanning direction are formed in a V shape in plan view, of course, there is no change in operation. The V-shaped surface 41 of the cutting blade 1 in FIG. 3 has a concave curved surface shape with a large curvature, and is ground by a grinding wheel having a grinding surface on the circumferential surface in the same direction as the curved surface direction. The fine uneven line 31 is formed in the vertical direction.
[0015]
In the cutting blade 1 formed in this way, the cutting edge portion (first angle) 11a and the connecting portion 11b are formed by the concave curved surfaces 11a ′ and 11b ′, thereby forming a concave curved surface (second angle). 11b ′ and 11b ′ also have a role of escaping from the upper edge of the work W and weakening unnecessary pressing. That is, the concave curved surfaces 11b ′ and 11b ′ of the connecting portion 11b have the same role as the flank of a cutting tool such as a cutting tool.
And the vertical minute uneven strips 31 formed over the entire length in the blade spanning direction improve the sharpness and increase the strength as the cutting blade 1 (strength of the cutting edge portion 11a and the connecting portion 11b). Become.
[0016]
In FIG. 1 (b), the connecting portion 11 is continuously formed across the blade edge portion 11a and the shank portion 21 so as to become thicker toward the shank portion, and is three-stage symmetrical with respect to the center line. In this case, the concave curved surfaces 11b 'and 11b' are formed.
Also in this case, symmetrically concave curved surfaces 11b ′ and 11b ′ that gradually increase in thickness after forming a slightly thin portion in the middle of the upper number angle with respect to each number angle.
[0017]
The thickness T2 of the shank portion 21 of the cutting blade 1 shown in FIG. 1A in the embodiment described above is 0.4 mm to 1 mm, the blade edge angle θ is about 15 degrees to 20 degrees, and the blade edge portion (first angle) 11a. The maximum thickness (intersection with the connecting portion 11b) T1 is 25 μm to 50 μm, the height H1 is 50 μm to 100 μm, and from the tip of the blade edge portion 11a to the intersection with the shank portion 21 of the connecting portion 11b The height H2 is slightly higher than 1 mm, and the second-right symmetrical concave curved surfaces 11b 'and 11b' thickness T3 are defined by the intermediate portion closer to the cutting edge portion (first corner) 11a as the T1. In addition, a thin part having a thickness of about 5 μm is formed in the middle and then gradually thickened, and a workpiece (thin-walled substrate such as a ceramic green sheet) W having a thickness of about 0.1 mm to 1 mm is cut. Although FIG. 1 (b) is not described in detail, it is the same except for T3. The second angle with respect to the first angle, the third angle with respect to the second angle, and the fourth angle with respect to the third angle are respectively the lower numbers. The upper corners (symmetrically curved concave surfaces) are formed so as to gradually increase in thickness after forming a thin portion about 5 μm thicker than the angular thickness.
[0018]
In the present embodiment, a cutting blade whose blade edge portion is an inclined plane is not shown in the figure. However, as in the above-described embodiment, the continuous portion is set to a second angle or a second angle with respect to the first angle. On the other hand, at the third angle, the fourth angle with respect to the third angle, and so on, a thin curved portion is formed in the middle, and then a concave curved surface that gradually becomes thicker. It is the same as making it into a shape.
The inclined flat surface of the blade edge portion is mirror-finished, whereby both blade surfaces of the blade edge portion are smoothed, which is suitable for obtaining a finer cutting tip.
[0019]
【The invention's effect】
In the present invention, the cutting function portion formed from the tip of the blade tip toward the shank portion as described above is formed at the necessary minimum (required minimum angle) on the left and right symmetrical concave curved surfaces, and toward the shank portion. In order to gradually increase the thickness of the blade, the one-step or multiple-step concave curved surfaces are continuously formed across the blade tip portion and the shank portion, and the concave curved surface and the lower step concave portion provided continuously with the blade edge portion. Since each of the upper concave curved surfaces connected to the curved surface is symmetrical with the thickness gradually increasing after forming a slightly thinner portion than the lower step angle, the conventional cutting function portion The entire cutting function part is thicker (except the cutting edge part) and shorter than the cutting blade that is configured with a flat entire cutting edge surface, and in contact with the workpiece of the concave curved surface at each angle excluding the cutting edge part when cutting. It is possible to cut with less cutting force by suppressing the resistance to be smaller , It is possible to provide an optimum cutting blade to cut fine chips without causing buckling deformation of the cutting edge.
In addition, the fine concavo-convex filaments with fine vertical lines can improve the sharpness, and can make the buckling strength of the connecting portion together with the blade edge portion more reliable.
And the cut surface is finished beautifully by mirror finishing of the left and right sides of the blade edge.
[Brief description of the drawings]
FIG. 1 shows an enlarged cross-sectional view of a cutting function part, which is a main part of a cutting blade according to the present invention. FIG. 1 (a) shows a case where the connecting part is composed of a single stepped curved surface, and FIG. The case where an installation part is comprised with three steps of concave curved surfaces is each shown.
FIG. 2 is a perspective view of the cutting blade of FIG.
FIG. 3 is a perspective view of a cutting blade in which only both end portions of the cutting function portion are V-shaped in plan view.
4A and 4B are cross-sectional plan views showing a cutting state of a cutting edge portion whose cross-sectional shape is an elongated rectangular shape, where FIG. 4A shows a spread state of both end portions of the cutting edge, and FIG. 4B shows a cutting state of the chip. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cutting blade 21 ... Shank part 11 ... Cutting functional part 11a ... Blade edge part (first corner)
11b ... continuous section X ... center line θ ... blade angle W ... ceramic green sheet (workpiece)
S ... Expansion 31 ... Vertical concavo-convex filament 11a '... Concave curved surface of blade edge 41 ... V-shaped surface 11b' ... Concave concave curved surface (second angle, third angle, fourth angle) )

Claims (4)

A flat blade-shaped cutting blade for cutting a thin plate-shaped workpiece,
The cutting function portion formed toward the shank from the tip, and a cutting edge which is formed a predetermined length at a concave curved surface symmetrical with respect to the center line, and the cutting edge portion to be thicker toward the shank portion constituted by said shank portion and the connecting portion formed in a symmetrical concave curved surfaces to be formed centerline over and in該連portion, concave curved surface to be continuously provided to the cutting edge but cutting blade, characterized in that the maximum thin Do portion than the thickness of the concave curved surface of the cutting edge portion after forming the middle is concave curved surface gradually that as thick. The connecting portion is formed of a plurality of steps of concave curved surfaces, and each upper concave curved surface has a portion thinner than the maximum thickness of the lower concave curved surface connected to the upper concave curved surface. The cutting blade according to claim 1, wherein the cutting blade is a concave curved surface that gradually becomes thick after being formed . The concave and convex surface of the cutting edge part and the concave and curved surface of the connecting part are formed by grinding fine uneven lines of vertical lines in the same direction as the curved surface direction over the entire length in the cutting edge direction. The cutting blade according to 1 or 2 . The left and right sides of the blade edge portion are replaced with a concave curved surface, and the flat surface is mirror-finished. The cutting blade according to claim 1 or 2 , wherein the cutting blade is formed by grinding.

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