JP2001058316A - Cutting blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cut chip from falling down sideways or being scattered when the cut chip is obtained by cutting a work in a checkered fashion by using a cutting blade of a flat-blade knife type for cutting a thin sheetlike work and making both end parts, in the longitudinal direction of the blade, of a cutting functional part formed from the tip toward the shank part a V-shape in plan view. SOLUTION: The cutting blade 1 is made of cemented carbide and is formed of a flat platelike shank 21 part and a cutting functional part 11 which executes a cutting operation. In addition, the cutting blade 1 has both end parts, in the length-of-blade direction, formed like V as in plan view. The cutting functional part 11 has a sharp V-shaped blade face 11c formed as a whole as viewed from the front or a sharp and almost V-shaped blade face 11c formed, as viewed from the front, of an edge part and right/left slant faces connected to the edge part. In both cases, the cutting functional part 11 has both end parts, in the length-of-blade direction, formed of V-shaped faces 41, 41 in plan view. Thus the blade face 11c and the V-shaped faces 41, 41 are connected to each other at an obtuse angle by making both end parts, in the length-of- blade direction, of the blade face 11c a V-shape in plan view. Consequently, such a phenomenon that a work is torn at the both end parts of the blade face 11c is minimized and a cut chip is prevented from being scattered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat blade-shaped cutting blade used in a cutting device and the like, and more particularly to a cutting blade for cutting a thin substrate such as a ceramic green sheet.

[0002]

2. Description of the Related Art There is a cutting apparatus suitable for cutting a thin substrate (material plate) such as a ceramic green sheet before sintering into a grid or the like to obtain a plurality of cutting chips.
In this type, a flat blade-shaped cutting blade is pressed against a work in a so-called guillotine manner at a predetermined interval (pitch feed), and the cutting blade is used. The V-shaped blade surface is formed. By the way, this kind of cutting blade is detachably attached to a vertically movable tool holder of a cutting apparatus (not shown), and a camera for centering is mounted on a support of the tool holder, and a predetermined pitch feed is performed. At each time, a pair of linear marks M (see FIGS. 6A and 6B) attached at equal intervals to the edge of the work (four edges in the case of a rectangular work) are aligned by a centering camera. After the image is taken, further image processing is performed, and the index table for sucking and holding the work W is corrected and moved by the corrected amount, the cutting blade 1 is lowered to cut the work W. This is repeated at every predetermined pitch feed in the length direction of the work W. When the feed is completed, the work W is rotated by 90 degrees on the index table and cut in the same manner. As a result, a cutting chip C is obtained. At this time, the four edge portions provided with the linear marks M are not suitable as cutting chips because the linear marks M remain. Therefore, the workpiece W to be cut is cut in a grid pattern while leaving a border in a frame shape.

[0003]

By the way, when cutting the work W into a grid and leaving the frame in a grid shape to obtain a chip C, when the cutting blade 1 is cut into the work W, the cross-sectional shape of the cutting edge portion is obtained. Is expected to be due to the slender rectangular shape.
As shown in FIG. The cut tip cut by the elastic restoring force due to the spread S may fall or scatter, and by this spread, a pressing force is applied to the adjacent cut tip C after cutting, and the cut tip C falls. This causes a problem such as scattering or scattering (FIG. 6B). In order to respond to the recent miniaturization of electronic devices, for example, the vertical and horizontal dimensions are set to 0.6.
In the case of a cutting chip of (mm) × 0.3 (mm), it was very difficult to cope with the cutting tip, particularly because it was very fine. Further, while maintaining the processing accuracy by pressing the work in a guillotine manner with the cutting blade formed by the cutting surfaces of the two blades as described above, for example, the vertical and horizontal dimensions are set to 0.6 (mm) × 0.3 (mm). In order to cut such a fine cutting tip, it is necessary to reduce the angle of the cutting edge to minimize deformation of the cut surface of the workpiece. For this reason, this type of cutting blade has a blade angle of about 10 to 30 degrees and a shank portion thickness of about 1 mm. However, if the blade tip angle is formed smaller without changing the blade thickness (thickness of the shank portion), the area of the left and right blade surfaces (cutting function portions) naturally becomes large, and the left and right both surfaces become large when cutting. There is also a problem that resistance is generated and a large cutting force is required at the time of cutting, and as a result, the blade edge portion undergoes buckling deformation.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional circumstances, and an object thereof is to leave a frame in a work and cut it in a grid pattern to obtain a cut chip. And to provide a cutting blade free from splattering. Another object is to provide a flat blade-shaped cutting blade having high buckling strength and good sharpness even at a fine desired blade angle.

[0005]

Means for Solving the Problems As a technical measure taken to achieve the above object, a first aspect of the present invention is a flat blade-like cutting blade for cutting a thin plate-like work, wherein a cutting edge is provided from a tip to a shank portion. The gist is that both ends in the blade length direction of the cutting function portion formed toward the front side have a V-shape in plan view.

According to this technical means, when a chip is obtained by cutting the work W in a grid shape while leaving the frame in a frame shape, when the cutting blade 1 is cut into the work W, the cross-sectional shape of the blade edge portion 11 is obtained. Is expected to be due to the slender rectangular shape.
As shown in the figure, both ends tend to split and spread. The cutting tip C itself cut by the elastic restoring force due to the spread S may fall or scatter,
Thus, a pressing force is applied to the adjacent cut chips C after cutting, and the cut chips C are turned over or scattered. By forming both ends of the cutting function unit 11 in the blade-width direction in a V-shape in a plan view over the entire height, the spread of both ends is prevented as much as possible, and the above problem is solved.

According to a second aspect of the present invention, the cutting function portion according to the first aspect is configured such that the cutting edge portion is formed to have a predetermined length with a concave curved surface symmetrical with respect to a center line and a thickness increases toward a shank portion. The cutting edge portion and the shank portion are formed continuously and formed continuously with a concave curved surface of one or more stages symmetrical to the center line with respect to the center line. The upper and lower concave curved surfaces connected to the lower concave curved surface and the lower concave curved surface, respectively, form a part that is slightly thinner than the lower step number in the middle, and then gradually become thicker. The gist is a concave curved surface.

[0008] According to the above technical means, the connecting portion connecting the cutting edge portion and the shank portion is symmetrical in the left-right direction so as to gradually increase the thickness from the rear end (upper end) of the cutting edge portion toward the shank portion. By continuously connecting the concave curved surfaces, the contact resistance applied to the workpiece at the time of cutting by the continuous portion is suppressed, and further, the corner angle, the cutting edge angle is the most corner, the concave curved surface of the upper stage is sequentially the second corner, If it is the third corner, the contact of the blade with the work of the concave symmetrical curved surface at the upper right that is the second corner with respect to the blade edge, which is the most corner, with the work becomes smaller. This is the same condition for the upper corners for each corner. Therefore, the cutting resistance is further suppressed, the work can be cut with a small cutting force, and the buckling deformation of the cutting edge portion is prevented.

According to a third aspect of the present invention, the concave curved surface of the blade edge portion and the concave curved surface of the continuous portion are provided with vertical fine uneven lines in the same direction as the curved surface direction over the entire length in the cutting direction. The point is that they are formed by grinding.

According to the above-mentioned technical means, in addition to the second aspect, it is cut so as to be cut by the fine uneven lines of the vertical eyes, thereby improving sharpness.

According to a fourth aspect of the present invention, both the left and right surfaces of the cutting edge portion are flat surfaces instead of the concave curved surfaces, and the flat surfaces are mirror-finished, and the concave curved surfaces of the continuous portions have the same direction as the curved surface direction. The gist of the present invention is that the fine uneven lines in the vertical direction are formed by grinding over the entire length in the blade length direction.

According to the technical means, in addition to the effect of the second aspect, the cut surface is beautiful.

As a material of the above-mentioned cutting blade, a cemented carbide material is preferable, and the wear resistance of the cutting blade formed in a shape having high buckling strength can be improved.

[0014]

Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show the first embodiment, FIGS. 3 to 5 show the second embodiment, and FIG. 6 shows a reference diagram. In the figure, reference numeral 1 denotes a cutting blade.

First, a first embodiment will be described. FIG.
As shown in FIG. 2 and FIG. 2, the cutting blade 1 is made of a highly brittle cemented carbide material, and is formed by a flat shank 21 and a cutting function unit 11 for performing cutting. It is formed in a V shape. The cutting function unit 11 is configured as shown in FIG.
As shown in (a), the whole is formed by a sharp V-shaped blade surface 11c, 11c in a front view, or as shown in FIG. 2 (b), a blade edge portion and an inclined shape connected to the blade edge portion. The left and right surfaces constitute sharp V-shaped blade surfaces 11c, 11c which are sharp in a front view, and both end portions in the blade cutting direction are formed by V-shaped surfaces 41, 41 in a plan view. Needless to say, in FIG. 1, both ends are V-shaped in plan view over the entire height of the cutting blade 1.
(B) In both cases, it is needless to say that only both ends of the cutting function unit 11 may be V-shaped in plan view.

FIG. 6 shows a phenomenon at the time of cutting which a conventional product exerts. This phenomenon has a particularly bad effect when the cut chip C (chip after cutting) has a small vertical and horizontal dimension of 0.6 (mm) × 0.3 (mm). This is the spread S of both ends when the work W is cut by trial (FIG. 6A). Although the cause is unknown, since the cross-sectional shape of the cutting function part is a horizontally-long rectangular shape, the work W is torn at two corners at right angles between the blade surface and the end surface, and when the cutting is performed by the blade surface (both right and left sides). It is expected that the elastic force of compression acts in the direction of the blade and appears as a spread S. Due to the spread S, as shown in FIG. 6 (b), when a chip C is obtained by cutting the work (ceramic green sheet) W into a grid pattern while leaving a border in a frame shape, The opposing cutting tip C is turned obliquely, whereby the cutting tip C already cut
, And the chip C or the cut chip C that has been cut by the reaction force may fly or fall.

As described above, in the first embodiment in which both ends of the cutting function unit 11 in the blade extending direction are formed by the V-shaped surfaces 41, 41 in plan view, the blade surfaces 11c, 11c which are the cutting function unit 11 are provided.
And the V-shaped surfaces 41, 41 are continuously formed at an obtuse angle, so that the phenomenon of tearing the ceramic work W at both ends is suppressed. Presumably, even if the elastic force of compression at the time of cutting acts in the direction of the blade, it did not appear as the spread S.

Next, a second embodiment shown in FIGS. 3 to 5 will be described. The cutting blade 1 is a flat shank 21.
Section and cutting function section 1 for performing cutting and increasing buckling strength
It consists of one. The cutting function unit 11 in FIG.
The edge portion is formed so as to gradually increase in thickness from the tip portion toward the shank portion 21, and has a predetermined length formed by a concave curved surface 11 a ′ symmetrical with respect to the center line X at a desired edge angle. ) Concave curved surfaces (second corners) 11b ', 11b' which are formed continuously over the cutting edge portion 11a and the shank portion 21 so as to gradually increase in thickness toward the shank portion 21 and are symmetrical with respect to the center line X. One-stage connecting portion 11 formed of
b. The cutting blade 1 is made of a highly brittle cemented carbide material, and has concave curved surfaces (second corners) 11b 'and 11b forming a cutting edge (most corner) 11a and a continuous portion 11b.
b ′ is formed by grinding with a grinding wheel having a grinding surface on the circumferential surface in the same direction as the curved surface direction and is formed with the same curvature as the curvature of the grinding wheel. Both of the portions 11b are formed with vertical fine uneven lines 31 over the entire length in the blade cutting direction by the grinding process. The cutting blade 1 has a concave curved surface (second corner) 11 b ′, 11 b ′ continuously provided to the blade tip (maximum corner) 11 a and a portion thinner than the blade tip (maximum corner) 11 a. Are formed in the middle, and are formed into bilaterally symmetric concave curved surfaces 11b 'and 11b' which become gradually thicker. These are concave curved surfaces (second corners) 11b ', 11b'
This is because the resistance to contact with the workpiece W when the workpiece is cut is suppressed to a smaller value. Further, as shown in FIG. 4, the entire height of both ends in the blade width direction is formed in a V-shape in plan view, and the V-shaped surfaces 41, 41 of the workpiece W are formed in the same manner as in the first embodiment.
Consideration is also given to preventing the spread S from occurring at the time of cutting.
In addition, as shown in FIG. 5, even if at least both end portions in the blade extending direction of the cutting function portion 11 are formed in a V-shape in plan view, the operation does not change. The V-shaped surface 41 of the cutting blade 1 in FIG. 5 has a concave curved surface shape with a large curvature in detail, and is ground in the same direction as the curved surface direction by a grinding wheel having a ground surface on a circumferential surface. , Vertical fine uneven lines 31 are formed.

In the cutting blade 1 formed as described above, the cutting edge (most corner) 11a and the continuous portion 11b are formed on the concave curved surface 11a.
The concave curved surfaces (second corners) 11b 'and 11b' have a role of escaping from the upper edge of the ceramic green sheet W and weakening unnecessary pressure by being formed of a 'and 11b'. ing. That is, the concave curved surfaces 11b 'and 11b' of the continuous portion 11b have the same role as the flank of a cutting tool such as a cutting tool. The longitudinal fine irregularities 31 formed over the entire length in the blade extending direction improve the sharpness and help to increase the strength as the cutting blade 1 (the strength of the cutting edge portion 11a and the continuous portion 11b). Become. And the first
As in the embodiment, the concave curved surfaces 11a ', 11a' and the V-shaped surfaces 41, 41 of the cutting edge portion (most corner) 11a, and the continuous portion 11 are formed.
b concave surface (second corner) 11b ', 11b' and V-shaped surface 4
Since the elements 1 and 41 are continuously connected at an obtuse angle, the phenomenon of tearing the ceramic green sheet (work) W at both ends is suppressed, and the cut chip C or the cut chip C does not fly or fall. Does not occur.

FIG. 3B shows that the connecting portion 11 is
The cutting edge portion 11a is thickened toward the shank portion.
And the shank portion 21 and three concave curved surfaces 11b ', 11b' symmetrical to the center line. Also in this case, left and right symmetric concave curved surfaces 11b 'and 11b' which gradually increase in thickness after forming a slightly thinner portion in the upper stage with respect to each corner are formed.

FIG. 3 in the second embodiment described above.
The thickness T2 of the shank portion 21 of the cutting blade 1 shown in FIG.
0.4 mm to 1 mm, the blade angle θ is about 15 to 20 degrees,
The maximum thickness (intersection with the connecting portion 11b) T1 of the cutting edge portion (most corner) 11a is 25 μm to 50 μm, the height H1 is 50 μm to 100 μm, and the cutting edge portion 11a extends from the tip to the connecting portion 11b. The height H2 up to the point of intersection with the shank portion 21 is slightly higher than 1 mm, and the thickness T3 of the left and right symmetric concave curved surfaces 11b 'and 11b', which is the second corner, is the cutting edge portion (most corner). An intermediate part near 11a is formed so that a part thinner than T1 by about 5 μm is formed halfway and then gradually thicker, and a work (thin substrate such as a ceramic green sheet or the like) having a thickness of about 0.1 mm to 1 mm is formed. ) Cut W. Although FIG. 3B is not described in detail, T
The same is applied except for the third corner, and the second corner for the first corner, the third corner for the second corner, and the fourth corner for the third corner each form a part thinner by about 5 μm thinner than the thickness of the lower corner. Then, the upper corners (concave curved surfaces symmetrical to the left and right) are formed so that the thickness gradually increases.

Further, in this embodiment, a cutting blade whose cutting edge portion is formed as an inclined plane is not shown. However, as in the second embodiment, the connecting portion is provided at the second corner with respect to the first corner. At the corner, the second corner, the third corner, the fourth corner at the third corner, etc., a thin curved portion is formed in the middle and then a concave curved surface that becomes gradually thicker, and at least both ends in the cutting direction of the cutting function part The same applies to the case where the portion is V-shaped in plan view. The inclined plane of the cutting edge is mirror-finished, so that both cutting surfaces of the cutting edge are regular and suitable for obtaining a finer cutting tip.

[0023]

According to the first aspect of the present invention, both ends of the blade surface in the blade crossing direction are V-shaped in plan view, and the blade surface and the V-shaped surface are continuously connected at an obtuse angle. When the phenomenon of tearing is reduced and chips are obtained by cutting the work in a grid pattern while leaving the border in a frame shape (see Fig. 6), even if the elastic force of compression at the time of cutting acts in the blade length direction, it spreads. It is possible to prevent an accident in which a chip that has been cut or an adjacent cut chip that has been cut is scattered as in the related art. According to claim 2, the cutting function portion formed from the blade tip toward the shank portion,
A symmetrical concave or curved curved surface forms a required minimum (required minimum angle) and a symmetrical one-step or a symmetrical step over the blade edge and the shank so that the blade thickness gradually increases toward the shank. A plurality of concave curved surfaces are continuously formed, and each of the concave curved surface connected to the cutting edge and the upper concave curved surface connected to the lower concave curved surface is slightly smaller than the lower corner angle. Since it is a symmetrical shape that gradually increases in thickness after forming a thin part, the resistance to contact with the workpiece on the concave curved surface at each corner excluding the cutting edge part during cutting is reduced, and it is smaller. The cutting blade can be cut with a cutting force, and is an optimum cutting blade for cutting a fine chip without causing buckling deformation of the cutting edge. According to the third aspect, the sharpness is extremely improved due to the fine vertical fine lines, and the buckling strength of the continuous portion together with the cutting edge can be made more reliable. According to the fourth aspect, the cut surface is beautifully finished by mirror finishing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of a cutting blade according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part, in which (a) shows a cutting function portion having a sharp V-shaped blade surface in a front view, and (b) is provided continuously with a blade edge portion and the blade edge portion. The cutting function unit that forms a sharp V-shaped blade surface that is sharp when viewed from the front with the inclined left and right surfaces is shown.

FIGS. 3A and 3B are enlarged cross-sectional views of a cutting function unit according to a second embodiment, in which FIG. 3A illustrates a case where a continuous unit is formed by a single concave curved surface, and FIG. Each case is shown with three concave curved surfaces.

FIG. 4 is a perspective view of the cutting blade of FIG.

FIG. 5 is a perspective view of a cutting blade in which only both ends of the cutting function unit are V-shaped in plan view.

6A and 6B are cross-sectional plan views showing a cutting state of a blade edge portion having an elongated rectangular cross-sectional shape, where FIG. 6A shows a state where both ends of the blade edge are spread, and FIG. 6B shows a state where a chip is cut. .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cutting blade 21 ... Shank part 11 ... Cutting function part 11a ... Blade edge part (most angle) 11b ... Continuous part X ... Center line θ ... Blade edge angle W ... Ceramic green sheet (work) S ... Spread 31 ... Longitudinal 11a ': concave curved surface of cutting edge 41 ... V-shaped surface 11b': left-right symmetric concave curved surface of continuous portion (second corner, third corner, fourth corner)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C069 AA01 BA01 BB01 CA03 EA01 EA02

Claims (4)

[Claims] 1. A flat blade-shaped cutting blade for cutting a thin plate-shaped work, wherein both ends in a blade-crossing direction of a cutting function portion formed from a tip toward a shank portion have a V-shape in plan view. A cutting blade, characterized in that: 2. The cutting function section extends between a cutting edge portion formed with a concave curved surface symmetrical to the center line and having a predetermined length with a predetermined length, and the cutting edge portion and the shank portion increasing in thickness toward the shank portion. And a continuous portion formed by a concave curved surface of one or more steps symmetrical with respect to the center line, and
And, in the connecting portion, each of the concave curved surface connected to the cutting edge portion and the upper concave curved surface connected to the lower concave curved surface has a portion slightly thinner than the lower corner. The cutting blade according to claim 1, wherein the cutting blade has a bilaterally symmetric concave curved surface that becomes gradually thicker after being formed in the middle. 3. The method according to claim 1, wherein the concave curved surface of the cutting edge portion and the concave curved surface of the continuous portion are formed by grinding fine concave / convex lines in the same direction as the curved surface direction over the entire length in the cutting direction. 3. The cutting blade according to claim 2, wherein: 4. The left and right surfaces of the blade edge portion are flat surfaces instead of concave curved surfaces, and the flat surfaces are mirror-finished, and the concave curved surface of the continuous portion has vertical concave / convex lines in the same direction as the curved surface direction. 3. The cutting blade according to claim 2, wherein the ridge is formed by grinding over the entire length in the blade crossing direction.