JPH04224128A - Glass cutting blade - Google Patents

Abstract

PURPOSE:To prolong the service life of a glass cutting blade, to form a sharp V-shaped groove on a glass surface in the case of cutting of the glass, to be obtain an excellent cutting property and to obtain a smooth cut face. CONSTITUTION:The cross sectional shape of an edge part 4 of the cutting blade is made into V-shape. The surface of this V-shaped blade edge 4a is coated with diamond. Edge part 4 is formed by ceramics compatible with diamond such as silicon nitride (Si3N4). Diamond film applied to the surface of the blade edge is shaped by a surface grinding treatment.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a glass cutting blade.
In particular, the present invention relates to a glass cutting blade that has a long blade life and is capable of smoothing the cut surface of glass.

0002

2. Description of the Related Art In recent years, glass substrates of various sizes, thicknesses, and materials have been used in various industrial fields depending on the purpose. For example, display panels, liquid crystal display boards,
Glass substrates are used as components of color filters and the like, and are cut into desired sizes and shapes.

[0003] Conventionally, as cutting blades for cutting glass, cutting blades in which diamond particles are embedded in metal and cutting blades made of cemented carbide are generally used because of their excellent hardness. However, the above-mentioned cutting blade does not have a sufficient lifespan, and various techniques have been proposed to improve this point.

[0004] For example, as a technique for forming the cutting edge with ceramic, Japanese Patent Laid-Open No. 55-104969 and Utility Model Laid-open No. 59-
No. 189840, JP-A-62-158129, etc. are known. That is, JP-A-55-104969 discloses a ceramic for glass cutting which contains aluminum oxide (Al2O3) as a main component and titanium carbide (TiC) and/or titanium nitride (TiN) as a component composition. Japanese Utility Model Application No. 59-189840 discloses a glass cutting blade made of a ceramic sintered body containing silicon nitride or silicon carbide as a main component. JP-A-62-158129 discloses a wheel cutter for cutting glass in which at least the cutting edge of the wheel is made of a ceramic material such as zirconia, alumina, silicon carbide, or silicon nitride.

Furthermore, in Japanese Utility Model Application Publication No. 59-61246, cemented carbide disks are installed on both sides of a thin disk-shaped blade made of a sintered body of polycrystalline diamond and/or boron nitride for reinforcement. A glass cutting blade having a bonded thereon is disclosed. moreover,
Japanese Utility Model Publication No. 61-42820 discloses a glass cutting blade in which an annular sintered body containing diamond and/or high-pressure phase boron nitride is arranged around the peripheral edge of a wheel made of metal or Cernat.

[0006]

[Problems to be Solved by the Invention] However, the above-mentioned glass cutting blades all have problems in that they are not sharp and have a short lifespan when used to cut high hardness glass such as quartz. In addition, in fields such as the electronics industry, it is becoming necessary to improve the precision of cutting surfaces, and it is required to cut glass so that the cut surface is smooth, but conventional glass cutting blades are insufficient. When cutting high-hardness glass, there is a problem in that a smooth and clean cut surface cannot be obtained. Furthermore, among the above-mentioned glass cutting blades, those using diamond sintered bodies have a short lifespan due to exfoliation of diamond particles, etc., and furthermore, there is a problem that it is difficult to maintain a highly accurate blade for a long period of time. In addition, as shown in FIG. 6, the grooves 8 formed on the surface of the glass 7 during glass cutting become rounded with time of use, and a large number of irregular cracks (random cracks) occur from the pressing point of the glass by the glass cutting blade 1.
There is a problem that the accuracy of the cut surface is poor because 9 is included. The present invention has been made in view of the above-mentioned problems.
The purpose of the present invention is to provide a glass cutting blade that has a long life and has high cutting accuracy that allows a smooth cutting surface to be obtained.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the inventor of the present invention has made extensive research, and as a result, the cutting edge of a glass cutting blade is made of ceramic coated with a diamond film, and the cross-sectional shape of the cutting edge is If the glass is cut into a V-shape, a sharp V-shaped groove will be created on the glass surface and cracks will appear in the pressing direction of the glass (perpendicular to the glass plate), resulting in a sharp and smooth cut. It was discovered that a surface can be obtained and cutting accuracy can be improved, and the present invention has been completed.

That is, the glass cutting blade of the present invention has a structure in which the cutting edge of the glass cutting blade is made of ceramic coated with a diamond film, and the cross-sectional shape of the cutting edge is V-shaped. It has a structure in which the surface of the ceramic is coated with a diamond film that has been surface-polished.
Depending on the need, the glass cutting blade can be either rotary or fixed.

The present invention will be explained in detail below. The glass cutting blade of the present invention has a cutting edge having a V-shaped cross section. The parts other than the cutting edge may have any shape. Here, the overall shape and structure of the glass cutting blade differ depending on whether the glass cutting blade is a rotary type or a fixed type.

In the case of a rotary glass cutting blade, for example, as shown in FIGS. 1(a) and 1(b), a wheel (blade body) 2 is installed at the center of a wheel-shaped glass cutting blade 1.
A through hole 3 is provided for passing a shaft (not shown) that rotatably supports the wheel 2, and a cutting edge 4 having a V-shaped cross section is formed on the outer periphery of the wheel 2. The surface of the cutting edge 4, which has a V-shaped cross section, is coated with a diamond film 5.

In the case of a fixed type glass cutting blade, for example, as shown in FIGS. 2(a) and 2(b), a semicircular glass cutting blade 1 is fixed to a holder 6, and the semicircular glass cutting blade 1 is It has a structure in which a cutting edge 4 having a V-shaped cross section is formed on the outer periphery of a circle. In addition, in the case of a fixed type, it is not necessary to form the glass cutting blade 1 in a semicircular shape, as shown in FIGS. 3(a) and (b).
It may be formed into an asymmetrical convex shape as shown in FIG. 2, or may be formed into any shape such as a partial circle obtained by cutting a circle. In the case of this fixed type glass cutting blade as well, the surface of the cutting edge 4 is coated with a diamond film 5.

[0013] In either the rotary type or the fixed type, the cross-sectional shape of the cutting edge 4 is V-shaped. This is to form a V-shaped diamond blade. The angle α of the cutting edge coated with the diamond film 5 is preferably 60 to 160°, particularly preferably 100 to 140°.
°. If the angle α of the cutting edge is too small, the blade will easily chip, and if it is too large, the cutting quality will deteriorate, which is undesirable. Note that the shape of the cutting edge 4 does not have to be a perfect V-shape, and may be rounded on the outside or inside of the blade. Further, as shown in FIG. 4, the cutting edge may be formed to have two stroke angles α and α'.

The material for forming the cutting edge portion of the glass cutting blade 1 is a low-expansion ceramic that is compatible with diamond in order to increase the adhesion strength of diamond. Ceramic material having sufficient strength, hardness and toughness is preferred. Ceramics with such properties include, for example, silicon nitride (Si3N4, etc.), silicon carbide (SiC), or those whose main components are mixtures thereof, sialon, diamond sintered bodies, c-
Examples include BN sintered body. Note that the parts of the glass cutting blade 1 other than the cutting edge portion 4 coated with diamond may be formed of other materials other than the above-mentioned ceramics, but the glass cutting blade 1 as a whole may be formed of materials selected from the above ceramics. Preferably, it is made of one type of material.

The glass cutting blade of the present invention has a structure in which the surface of the V-shaped blade edge made of ceramic of the above-mentioned glass cutting blade is coated with a diamond film. The method for forming the diamond film, the properties of the diamond film, the synthesis conditions, etc. will be described later. The thickness of the diamond film is selected appropriately. In the case of a fixed type blade, since the diamond film is required to have higher wear resistance than a rotary type blade, the film thickness needs to be thicker, for example, about 10 to 100 μm.

In the case of a rotary glass cutting blade, as shown in FIG.
A diamond film is coated using a jig as shown in the figure. The reason for using a jig is that if the sides 2a and 2b of the wheel 2 and the through hole 3 are coated with diamond, the shaft that supports the wheel and the metal fittings that slide on the side of the wheel may be damaged, and it may be difficult to mount the jig accurately. This is because it is not desirable to be unable to do so. The jig includes a shaft 10 that engages with the through hole.
and press members 11a and 11b, and the shaft 10 shields (masks) the through hole 3. In addition, the pressing member 11a
, 11b press the side portions of the wheel to shield the side portions 2a, 2b of the wheel 2, and support the wheel 2. By using this jig, only the cutting edge surface 4 can be easily coated with diamond.

The method for synthesizing the diamond film is not particularly limited as long as it can form a diamond film by exciting the raw material gas using a vapor phase method. For example, plasma using direct current or alternating current arc discharge may be used. Methods using plasma from high-frequency dielectric discharge, Methods using plasma from microwave discharge (including magnetic field-CVD method and ECR method), Methods using light energy (photoCVD method, laser-induced CVD method) Alternatively, any one of a thermal decomposition method (including an EACVD method) in which thermal decomposition is performed by heating with a hot filament, a combustion flame method, a sputtering method, an ion plating method, etc. can be adopted. In particular, a method in which raw material gas is plasma decomposed by direct current or alternating current arc discharge, and a microwave method in which raw material gas is irradiated with microwaves and activated gas is brought into contact with a base material to form plasma to form a diamond film. plasma CVD
(including magnetic field method) and hot filament method are preferred. Regarding the properties of the diamond film, crystalline diamond is the most preferable, but amorphous carbon thin film (diamond-like carbon thin film)
It may be. This is because the diamond-like carbon film has a hardness close to that of diamond. The conditions for synthesizing the diamond film, such as the raw material gas, reaction pressure, and substrate temperature, are appropriately selected depending on the diamond film formation method employed, the desired properties of the diamond film, and the like.

In the present invention, it is preferable that the diamond film coated on the edge surface of the glass cutting blade obtained above is shaped by surface polishing. The surface polishing treatment is performed using diamond abrasive grains or the like. By polishing the surface of the diamond film in this way, it becomes even sharper and a smoother cut surface can be obtained.

The glass cutting blade of the present invention described above can be modified as appropriate. For example, disk-shaped reinforcing plates may be attached to both sides of the ceramic blade 1 for cutting glass. Further, in order to extend the life of the blade, an angle changing hole may be provided in the mounting portion of the fixed type glass cutting blade so that the portion of the blade that contacts the glass can be changed for use.

[0020]

[Examples] The present invention will be explained in more detail with reference to Examples below.

Example 1 Diameter (major axis) 3 mmφ, thickness 1 mm, cutting edge angle (α) 12
A rotary glass cutting blade was prepared by coating the cutting edge of a 5° ceramic wheel made of silicon nitride (Si3N4) with a diamond film to a thickness of 20 μm by microwave plasma CVD. The diamond film was synthesized by the microwave plasma CVD method using a mixed gas of 15 vol % CO and 85 vol % H (flow rate 200 sccm) as a raw material gas, a synthesis time of 10 hours, and a wheel (substrate) temperature of 960°C. A glass cutting test was conducted using the rotary glass cutting blade obtained as described above. Quartz glass was used as the glass. As a result, even after grooving over a length of 10 km, the groove only becomes slightly shallower, and the groove has a beautiful V-shape, and the cut surface of the glass when this is cut is smooth and clean. there were. The above conditions and results are shown in Table 1.

Example 2 The surface of the diamond film coated on the cutting edge was coated with #20
Example 1 except that it was polished with 00 diamond abrasive grains.
A rotary glass cutting blade was created in the same manner as above, and a glass cutting test was conducted. As a result, even after grooving over a length of 10 km, the depth of the groove remained unchanged and the groove maintained a clean V-shape. Furthermore, the cut surface when cutting the glass was smooth and clean. The above conditions and results are shown in Table 1.

Comparative Example 1 A glass cutting test was carried out in the same manner as in Example 1 except that the ceramic wheel was used as a glass cutting blade without being coated with diamond. As a result, 1
Even after grooving over a length of about Km, the groove became shallow and its shape became distorted. Furthermore, when cutting the glass, the cut surface was dirty and some cutting defects occurred. The above conditions and results are shown in Table 1.

Comparative Example 2 A glass cutting test was conducted in the same manner as in Example 1 except that a cemented carbide wheel cutter having the same dimensions and shape as in Example 1 was used as the glass cutting blade. The result was 3K
Even after grooving over a length of approximately m, the groove became shallow and the shape of the groove became distorted. Furthermore, when cutting the glass, the cut surface was dirty and some cutting defects occurred. The above conditions and results are shown in Table 1.

[0025]

[Table 1]

As is clear from Examples 1 and 2 and Comparative Examples 1 and 2, the life of the diamond-coated glass cutting blade of the present invention is more than three times longer than that of conventional products, and the cutting surface is in good condition. It turns out that.

Example 3 A diamond film was deposited thickly on the cutting edge of a semicircular silicon nitride (Si3N4) glass cutting (ceramic) blade with a radius of 3 mmφ, a thickness of 1 mm, and a cutting edge angle of 125° using the micro-blade plasma CVD method. Coat with a thickness of 20 μm,
We created a fixed type glass cutting blade. Note that the conditions for synthesizing the diamond film by the micro-blade plasma CVD method were the same as in Example 1. A glass cutting test was conducted using the fixed glass cutting blade obtained as described above. Quartz glass was used as the glass. As a result, 1
Even after grooving over a length of 0 km, the groove was only slightly shallower, and the groove had a clean V-shape, and the cut surface was smooth and clean. The above conditions and results are shown in Table 2.

Example 4 The surface of the diamond film coated on the cutting edge was #200.
A fixed type glass cutting blade was prepared in the same manner as in Example 3 except that it was polished with 0 diamond abrasive grains, and a glass cutting test was conducted. As a result, even after grooving for 10 km, the depth of the groove did not change, and the groove maintained a clean V-shape. Furthermore, the cut surface when cutting the glass was smooth and clean. The above conditions and results are shown in Table 2.

Comparative Example 3 A glass cutting test was carried out in the same manner as in Example 3, except that the glass cutting blade was not coated with diamond and the semicircular glass cutting ceramic blade was used as the glass cutting blade. As a result, even after grooving over a length of approximately 300 m, the groove became shallow and its shape became distorted. Furthermore, when cutting the glass, the cut surface was dirty and some cutting defects occurred. Comparative Example 4 A glass cutting test was conducted in the same manner as in Example 3, except that a semicircular cemented carbide cutter having the same dimensions and shape as in Example 3 was used as the glass cutting blade. As a result, 3
Even after grooving over a length of approximately Km, the groove became shallow and the shape of the groove became distorted. Furthermore, when cutting the glass, the cut surface was dirty and poor cutting occurred. The above conditions and results are shown in Table 2.

[0030]

[Table 2]

As is clear from Examples 3 and 4 and Comparative Examples 3 and 4, the life of the diamond-coated glass cutting blade of the present invention is more than three times longer than that of conventional products, and the cutting surface is in good condition. I understand that. Furthermore, it can be seen that even the fixed type shows the same performance as the rotary type.

As explained above, according to the glass cutting blade of the present invention, the life of the blade is longer than that of conventional products, and high hardness glass can be cut with a smooth cut surface.

[Brief explanation of the drawing]

FIG. 1 shows an example of a rotary glass cutting blade of the present invention. (a) is a longitudinal cross-sectional view, and (b) is a cross-sectional view.

FIG. 2 shows an example of a fixed glass cutting blade of the present invention. (a) is a partially cutaway front view, and (b) is a side view.

FIG. 3 shows another example of the fixed glass cutting blade of the present invention. (a) is a front view, and (b) is a side view.

FIG. 4 is a partial sectional view showing another example of the cross-sectional shape of the cutting edge of the glass cutting blade of the present invention.

FIG. 5 is a front view showing a jig used when coating a diamond film.

FIG. 6 shows a cutting situation using a conventional glass cutting blade. (a) is a front view, and (b) is a sectional view.

[Explanation of symbols]

1 Glass cutting blade 4 Cutting edge 5 Diamond film

Claims (4)

[Claims] 1. A glass cutting blade characterized in that the cutting edge of the glass cutting blade is made of ceramic coated with a diamond film and has a V-shaped cross section. [Claim 2] Claim 1, characterized in that the diamond film coated on the surface of the ceramic is subjected to surface polishing treatment.
Glass cutting blade as described. 3. The glass cutting blade according to claim 1 or 2, wherein the glass cutting blade is of a rotary type. 4. The glass cutting blade according to claim 1 or 2, wherein the glass cutting blade is of a fixed type.