JP2004058301A - Cutting blade for brittle material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting blade for glass having a cutting edge of a well-formed shape and assuring a scribing performance. <P>SOLUTION: In the cutting blade 1 for the glass made of a cemented carbide or a sintered diamond having truncated cone surfaces 2A, 2B formed at both left and right sides and a circular cutting edge 3 projecting in a V shape outwardly at crossed sides of these truncated cone surfaces, a surface roughness of the conical surface 2A of one side of right and left sides is different from that of the conical surface 2B of the other side of the right and left sides. Thus, a disorder in the shape of the edge 3 can be reduced as much as possible at the edge 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting edge for a brittle material used in a step of cutting a brittle material such as glass, ceramic, and a semiconductor wafer, and a method for manufacturing the same.
[0002]
[Prior art]
Hereinafter, as a specific example of the cutting edge for a brittle material, a glass cutting blade for cutting a scribe line on a glass plate will be described.
[0003]
Conventionally, as shown in FIG. 4, frustoconical surfaces 12, 12 are formed on both sides, and a circular cutting edge 13 protruding outward in a V shape is formed on the side where the frustoconical surfaces 12, 12 intersect. A formed cutting edge 11 for glass made of cemented carbide or sintered diamond is known. The glass cutting blade 11 is rotatably supported by a glass scriber head (not shown) or the like, and is rolled on the glass plate in a pressed state, whereby a scribe line (cut line) can be cut on the glass plate.
[0004]
Such a glass cutting blade 11 moves, for example, a rotating diamond grindstone R of a grinding apparatus 20 shown in FIG. 5 with respect to a rotating cutting edge member in the direction of the cutting edge angle of the cutting edge 11 for glass. It can be manufactured by grinding members.
[0005]
Specifically, after a disk D made of cemented carbide or sintered diamond, which is a cutting edge member, is fixed to the shaft 21, the shaft 21 is rotated by a motor (not shown), and the roughness r1 (for example, , # 200 to 300) are rotated and moved in the direction of the blade edge to grind one half of the circumferential edge of the disk D, thereby forming a truncated conical surface 121 on one left and right side. Then, after removing the disk D having the frustoconical surface 121 formed on one of the left and right sides from the shaft 21 and turning it over, it is fixed to the shaft 21 again, and is similarly ground by using a diamond grindstone R1 having the same roughness r1. A frustoconical surface 121 is also formed on the other side (see FIG. 6A).
[0006]
In this way, if the disk D is roughly ground into a flat abacus ball shape, it is replaced with a diamond whetstone R2 having a finer roughness r2 (for example, # 600 to 1000). Of the circular truncated cones 121 (see FIG. 7 (a) and FIG. 7 (a)) FIG. 8A).
[0007]
[Problems to be solved by the invention]
By the way, when manufacturing the cutting edge 11 for glass, one of the left and right frustum conical surfaces 121 on one side of the rough grinding is finish-ground to the product surface 12, and the other is the rough fritted conical surface 121 on the other side of the right and left. In order to perform the grinding with the diamond grindstone R2 having the same roughness r2 as the case of the finish grinding to 12, the cutting edge formed by first finish grinding the frustoconical surface 121 on the left and right sides (see FIG. 7B) Is ground with the diamond grindstone R2 having the same roughness r2 when the other side of the frustum conical surface 121 is finish-ground. Therefore, since the surface roughness of the truncated conical surface 12 due to the diamond grindstone R2 appears on the cutting edge 13, the cutting edge 13 of the glass cutting blade 11 is a composite of the surface roughness of the right and left truncated conical surfaces 12, 12. As a result, due to the finish grinding of the left and right frustoconical surfaces 121, cracks and chips occur in the very fragile cutting edge 13 (see FIG. 7B) formed by the finish grinding of the left and right frustoconical surfaces 121 first. However, it was difficult to stably form a good cutting edge 13 (see FIG. 8B). For this reason, there has been a problem that the scribing performance required by the glass cutting blade 11 cannot be stably obtained.
[0008]
The following can also be considered. The edge formed by first finishing the left and right frusto-conical surfaces 121 is ground with the diamond grindstone R2 having the same roughness r2 when the other side of the frusto-conical surfaces 121 is finish-ground. Is a composite of the surface roughness of the frustoconical surfaces 12, 12 on both the left and right sides. For this reason, as shown in FIG. 8C, a swell occurs in the trajectory of the cutting edge. It has been found that a constant vertical crack can be stably formed by keeping the undulation width UN (see FIG. 8C) of the cutting edge constant. In addition, in order to obtain stable scribe performance, it is preferable to reduce the undulation of the cutting edge and make it nearly linear. However, it was difficult to adjust the width of the undulation of the cutting edge.
[0009]
The present invention has been made in view of such problems, and provides a cutting edge for brittle material, which is an example of a cutting edge for glass having a good cutting edge capable of securing a constant scribe performance, An object of the present invention is to provide a method for producing a cutting edge for brittle material, which can stably form a good cutting edge without impairing scribe performance.
[0010]
[Means for Solving the Problems]
The cutting edge for brittle material of the present invention has a frustoconical surface formed on both left and right sides, and a carbide cutting edge formed with a circular cutting edge protruding outward in a V-shape on a side where the frustoconical surfaces intersect. In the cutting edge for brittle material made of alloy or sintered diamond, the surface roughness of the right and left frustoconical surfaces is different from the surface roughness of the left and right other frustoconical surfaces.
[0011]
According to the present invention, since the surface roughness of the left and right frustoconical surfaces is formed to be different from the surface roughness of the left and right frustoconical surfaces, the cutting edge formed on the side where these frustoconical surfaces intersect. Has a good edge shape and can secure a more stable scribe performance than before.
[0012]
The manufacturing method of the cutting edge for brittle material of the present invention is to form a left and right truncated conical surface by diagonally grinding circumferential edges on both sides of the disk while rotating a hard metal or sintered diamond disk. In a method for manufacturing a cutting edge for brittle material, in which a circular cutting edge protruding outward in a V-shape is formed on a side where these frustoconical surfaces intersect, a left and right frustoconical surface is set for finishing with a set roughness. After grinding with a grinding wheel, the left and right frustoconical surfaces are ground with a finer grinding wheel than the finishing grindstone on the left and right frustoconical surfaces.
[0013]
According to the present invention, a disk made of cemented carbide or sintered diamond is roughly ground with a grindstone having a set roughness to form a semi-finished product having a substantially product shape having a truncated conical surface having a surface roughness of the grindstone on the left and right sides. After that, using a finer grindstone, finish-grinding the roughed frustum on one side on the left and right, and then using a finer grindstone, finish-grinding the frustum on the other side. I do.
[0014]
As a result, the finish grinding of the frustum of the conical surface on the left and right sides is less affected on the cutting edge on which the surface roughness of the frustum of the conical surface on the left and right sides which has been previously finished is less affected, and the disturbance of the shape of the cutting edge is minimized. Can be reduced. Therefore, it is possible to stably manufacture a brittle material cutting blade having a well-formed cutting edge, and it is possible to ensure stabilization of scribe performance of the manufactured brittle material cutting blade.
[0015]
In the present invention, if the grinding amount of the left and right frusto-conical surfaces on the left and right sides to be finish-ground later is greater than the grinding amount on the left and right frusto-conical surfaces for the first finish grinding, the left and right one-side cones previously finished and ground The truncated cone on the left and right sides is removed between the left and right frustoconical faces on the left and right sides that were finished and ground after the rough-shaped cutting edge formed on the trapezoid was removed. A new cutting edge having a surface roughness of is formed. Therefore, it is possible to stably form an edge having a uniform shape.
[0016]
In the present invention, it is preferable that the roughness of the finishing grinding wheel to be finish-ground later is about three times or more the roughness of the finishing grinding wheel to be finish-ground first.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 shows a glass cutting blade 1 of the present invention.
[0019]
This glass cutting blade 1 is mainly made of cemented carbide or sintered diamond, has frusto-conical surfaces 2A, 2B formed on both sides, and is directed outward to the side where these frusto-conical surfaces 2A, 2B intersect. A circular cutting edge 3 protruding in a V-shape is formed. The surface roughness of the left and right frusto-conical surfaces 2B is formed to be approximately three times the surface roughness of the left and right frusto-conical surfaces 2A.
[0020]
Therefore, the circular cutting edge 3 formed on the side where the frusto-conical surfaces 2A and 2B on both sides intersect becomes a well-shaped and good one, and scribe performance can be secured.
[0021]
The dimensions of the glass cutting blade 1 of this embodiment are, for example, a diameter of 2.5 mm, a width of 0.65 mm, and a blade angle θ of 120 degrees.
[0022]
Next, a process of manufacturing such a glass cutting blade 1 will be described.
[0023]
As shown in FIG. 5, first, a disk D made of cemented carbide or sintered diamond is fixed to the shaft 21, and then the shaft 21 is rotated by a motor (not shown) to rotate the disk D while rotating the disk D. While rotating the diamond grindstone R1 (for example, # 200 to 300) and moving the diamond grindstone substantially in the angle direction of the cutting edge (the angle direction in which the cutting edge angle becomes 117 degrees), the circumferential edge on one of the left and right sides of the disk D is ground. Thereby, a frustoconical surface 21A is formed on one left and right side. Then, after removing the disk D having the frusto-conical surface 21A formed on one of the left and right sides from the shaft 21 and turning it over, the disk D is fixed to the shaft 21 again, and is similarly ground using a diamond grindstone R1 having the same roughness r1. A frustoconical surface 21B is also formed on the other side (see FIG. 2).
[0024]
In this way, if the disk D is roughly processed into a flat abacus ball shape, it is replaced with a diamond whetstone R2 having a finer roughness r2 (for example, # 600 to 1000), and both the disk D and the whetstone R2 are replaced. While rotating, the grindstone R2 is moved in the direction of the cutting edge angle (120 degrees) to finish-grind the frustum surface 21A on one side on the left and right sides previously roughened, thereby obtaining the frustum surface 2A (see FIG. 3). Then, after removing the semifinished product having the left and right frusto-conical surfaces 21A finished and ground from the shaft 21 and turning over the semifinished product, the semifinished product is fixed to the shaft 21 and has a finer roughness r3 (for example, approximately three times the roughness r2). Using a diamond grindstone R3 (# 2000-3000) of fineness, the right and left frustoconical surfaces 21B are similarly finish-ground.
[0025]
As a result, the right and left frusto-conical surfaces 2B finished and ground by the diamond grindstone R3 having a roughness r3 finer than the surface roughness of the right and left frustoconical surfaces 2A finished and ground by the diamond whetstone R2 having the roughness r2. Since the surface roughness of the surface is small, the finish grinding of the left and right frusto-conical surfaces 2B is less affected on the cutting edge 3 in which the surface roughness of the left and right frusto-conical surfaces 2A, which has been previously ground, is less affected. Disorder of the cutting edge shape can be reduced as much as possible (see FIG. 1B). Also, at this time, the undulation of the cutting edge is almost a straight line (see FIG. 1C). In this case, the width UN of the undulation of the cutting edge changes depending on the roughness of the diamond grindstone used for finishing the left and right frustoconical surfaces 2A.
[0026]
Therefore, it is possible to stably produce the glass cutting blade 1 having the edge 3 having a well-shaped shape, that is, the glass cutting blade 1 having stable scribe performance.
[0027]
In this case, the amount of finish grinding of the left and right frusto-conical surfaces 2B on the left and right sides by the diamond grindstone R3 having a further finer roughness r3 is smaller than the amount of finish grinding of the right and left frustoconical surfaces 2A by the diamond grindstone R2 having a finer roughness r2. Is set to be large, a very brittle cutting edge is removed by the frustum conical surface 2A on the left and right sides which has been previously ground and the left and right frusto-conical surfaces 2A and the frustum conical surfaces 2B on the other left and right sides are removed. The new cutting edge 3 having the surface roughness of the frustoconical surface 2B on the side is formed, and the cutting edge 3 having a uniform shape can be formed stably. At this time, the undulation of the cutting edge is almost a straight line. In this case, the width UN of the undulation of the cutting edge varies depending on the roughness of the diamond grindstone used for finishing the frustum surface 2B on the left and right sides.
[0028]
Further, in the present embodiment, cutting of glass has been described as an example, but the present invention can also be applied to cutting of brittle materials such as ceramics and semiconductor wafers.
[0029]
Further, in the above-described embodiment, the case where the grinding is performed from the disk D which is the cutting edge member has been described. However, the cutting edge for brittle material in which the right and left truncated cone surfaces are finish-ground by the grindstone R2 having the roughness r2, The present invention can also be applied to a case in which a cutting edge for a brittle material that has been finish-ground with a grindstone having a roughness other than that is re-ground by wear.
[0030]
【The invention's effect】
As described above, according to the glass cutting blade of the present invention, it is possible to ensure a certain scribe performance by having a good cutting edge without cracking or chipping. In addition, according to the method for manufacturing a glass cutting blade of the present invention, a well-formed and well-cut edge capable of securing a constant scribe performance can be stably formed.
[Brief description of the drawings]
FIG. 1 is a front view of an embodiment of a glass cutting blade of the present invention, an enlarged view from the X direction schematically showing the cutting edge, and an enlarged view schematically showing a locus of the cutting edge.
2 is a front view of a semi-finished semi-finished product in a manufacturing process of the glass cutting blade of FIG. 1 and an enlarged view from the Y direction schematically showing a cutting edge thereof.
FIG. 3 is a front view of a semifinished product in which one side of a truncated conical surface is finish-ground in a manufacturing process of the glass cutting blade of FIG. 1, and an enlarged view from the Z direction schematically showing a cutting edge thereof.
FIG. 4 is a side view and a front view showing a conventional glass cutting blade.
FIG. 5 is a schematic view showing a processing apparatus for manufacturing a glass cutting blade.
FIG. 6 is a front view of a semi-finished product that has been roughly processed in a conventional manufacturing process of a glass cutting blade, and an enlarged view from the U direction schematically showing the cutting edge thereof.
FIG. 7 is a front view of a semi-finished product in which one side of a truncated conical surface is finish-ground in a conventional manufacturing process of a glass cutting blade, and an enlarged view from the V direction schematically showing the cutting edge thereof.
FIG. 8 is a front view of a product in which both frustoconical surfaces are finish-ground in a conventional manufacturing process of a glass cutting blade, an enlarged view from the W direction schematically showing the blade edge, and an enlarged view schematically showing the locus of the blade edge. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutting edge for glass 2A, 2B Frustoconical surface 3 Cutting edge 20 Processing equipment R1, R2, R3 Diamond grinding stone

Claims (4)

A brittle material made of cemented carbide or sintered diamond in which frustoconical surfaces are formed on both left and right sides and a circular cutting edge protruding outward in a V-shape is formed on the side where these frustoconical surfaces intersect. A cutting edge for brittle material, wherein the surface roughness of the right and left frustoconical surfaces is different from the surface roughness of the left and right other frustoconical surfaces. While rotating a disc made of cemented carbide or sintered diamond, the circumferential edges on both sides of the disc are grinded diagonally to form left and right frustoconical surfaces, and directed outward to the side where these frustoconical surfaces intersect. In the method for manufacturing a cutting edge for brittle material that forms a circular cutting edge protruding in a V-shape, the left and right frusto-conical surfaces are ground using a finishing grindstone having a set roughness, and then the frusto-conical surfaces on the other right and left sides Of a cutting edge for brittle material, characterized in that the surface is ground with a grinding wheel for finishing that is finer than a grinding wheel for finishing on one of the left and right frustoconical surfaces. 3. The cutting edge for brittle material according to claim 2, wherein the grinding amount of the left and right frustum surfaces of the left and right sides to be finish-ground later is larger than the grinding amount of the left and right frusto-conical surfaces for the finish grinding first. Method. The brittle material according to claim 2 or 3, wherein the roughness of the finishing grinding wheel to be subjected to the finish grinding is approximately three times or more the roughness of the finishing grinding wheel to be subjected to the finish grinding first. Manufacturing method for cutting blades.

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