TW201823171A - Cutter wheel capable of forming a complete high-penetration scribe line even with a smaller scribing load divided into unit products with excellent end face strength - Google Patents

Abstract

The invention provides a cutter wheel which is capable of forming a complete high-penetration scribe line even with a smaller scribing load divided into unit products with excellent end face strength. The cutter wheel of the invention has a V-shaped knife point ridge line 4 formed by two inclined faces 3a, 3a intersecting with each other on a circumferential surface, and a groove portion 5 globally machined on the knife point ridge line 4 at a specific pitch P, so as to alternately form the groove portion 5 and the remaining knife point ridge line portion 6. By setting the pitch P to be 100 [mu]m to 200 [mu]m, the length 5a of the groove portion 5 to be 3 [mu]m to 10 [mu]m, and the depth 5b of the groove portion 5 to be 1 [mu]m to 3 [mu]m, the high-penetration scribe line S can be formed with a smaller load.

Description

Cutter wheel

The present invention relates to a cutter wheel (also referred to as a scribing wheel) used for processing a scribe line (groove) for breaking on the surface of a brittle material substrate such as glass or a bonded substrate on which two brittle material substrates are bonded ).

Previously, a method is generally known, which involves cutting a brittle material substrate such as a glass substrate (hereinafter also referred to as a "substrate") by pressing a cutter wheel against the surface of the substrate to form a scribing line. The scribing is performed by applying an external force from the back surface side to deflect the substrate, thereby dividing it into individual unit substrates, as disclosed in Patent Document 1, for example. A cutting wheel used for processing a frangible material substrate is a cutting wheel. It has a V-shaped cutting edge composed of two inclined surfaces that intersect each other on the circumferential surface, and a bearing hole for mounting is provided in the center. As the above-mentioned cutter wheel, there are a cutter wheel (hereinafter also referred to as a "common cutter wheel") which smoothly finishes the blade ridge line, and a groove portion is provided at a specific pitch at the blade ridge line ( Notch) cutter wheel (hereinafter also referred to as "slotted cutter wheel"). The scribe lines formed by the cutter wheels will be described with reference to FIG. 3. FIG. 3 is a diagram showing ribs and vertical cracks formed on the substrate, FIG. 3 (a) is a cross-sectional view along the scribe direction, and FIG. 3 (b) is a cross-sectional view along the direction orthogonal to the scribe line. The scribe line S is formed by the bite mark of the cutter wheel on the surface of the substrate, that is, the plastic deformation region, and the vertical crack 8 generated directly below the plastic deformation region and penetrating in the thickness direction of the substrate W. A characteristic mark called a rib 7 is generated over a specific depth above the vertical crack 8. L1 in FIG. 3 represents the amount of ribs (depth) from the surface of the substrate W, and L2 represents the amount of vertical cracks (depth of penetration) from the surface of the substrate W. Although a normal cutter wheel can be used to form a perfect groove surface when scribing, on the other hand, it has the disadvantages that the bite force on the substrate surface is small and the blade tip is easy to slide. Therefore, when a scribing is started from the inner side of the substrate from the inside, it is not easy to produce vertical cracks immediately after the scribing is started, and if the scribing load is increased to form a deeper vertical crack, the substrate surface is horizontally generated. Irregular cracks extending in the direction, or scars in the grooves, make the frequency of defective products higher. On the other hand, in a cutter wheel in which a groove portion (notch) is provided on the blade ridge line, the groove portion and the blade ridge line (convex portion) are alternately formed. As a result, compared with ordinary cutter wheels, a higher scribe load can be applied to the substrate, a scribe can be formed by a sufficiently deep vertical crack, and the occurrence of cracks in irregular directions or horizontal cracks can be suppressed. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent No. 3787489

[Problems to be Solved by the Invention] In recent years, due to the miniaturization and precision of unit products such as liquid crystal panels obtained by cutting glass substrates, high-precision cutting with excellent end-face strength of the cut surface is required. Therefore, a slotted cutter wheel capable of processing a high-permeability intact scribing line with a smaller scribing load is needed. In particular, as shown in FIGS. 6 and 7, in a bonding substrate in which two glass substrates W and W are bonded via a sealing portion 10 and a plurality of liquid crystal injection regions 11 divided into a grid shape by the sealing portion 10 are used in When the scribe line S is processed on the glass substrate W by using the cutter wheel 12 directly above the seal portion 10, the bite of the cutter wheel 12 may be deteriorated due to the elasticity of the seal portion 10, etc. The problem that ribs or vertical cracks cannot be fully formed under a linear load. Moreover, if the load of the scribing line is increased, the deflection of the glass substrate W becomes large, irregular cracks extending in the horizontal direction occur on the substrate surface, or damages such as flaws occur in the grooves, which increases the frequency of defective products. . Therefore, the object of the present invention is to provide a cutter wheel which can form a high-permeability intact scribing of a substrate such as glass, even with a load smaller than that of the previous scribing, so that it can be broken into a surface with excellent end strength. Unit products. [Technical means to solve the problem] In order to solve the above-mentioned problems, the present invention is directed to the following technical methods. That is, the present invention relates to a V-shaped cutting edge ridge line formed by two inclined surfaces that intersect each other on a circumferential surface, and a groove portion is processed at a specific pitch over the entire area of the cutting edge ridge line, and the groove portion and the The disc-shaped cutter wheel formed alternately by the remaining ridge lines of the blade tip, and the pitch is 100 to 200 μm, the length of the groove is 3 to 10 μm, and the depth of the groove is 1 to 3 μm. Range. Here, it is preferable that the diameter of the cutter wheel is set to 1 to 5 mm, and the angle at which the two inclined surfaces intersect is set to 90 to 120 °. [Effects of the Invention] In the cutter wheel of the present invention, by forming under the above conditions, it is possible to bite into the substrate surely and form ribs even with a lower scribing load, and to form a high penetration required for breaking. Vertical crack. Thereby, when the fracture is broken, the fracture can be performed with an intact cut surface without a flaw, and a unit product with excellent end face strength can be obtained. In particular, in a bonded substrate in which two glass substrates are bonded via a sealing portion, when a scribe line is processed on the glass substrate directly above the sealing portion, it has the following effects: it is not affected by the presence of the sealing portion, and can be compared with The small scribe line load produces a scribe line with deep ribs and high-permeability vertical cracks, which can be fractured on the section with excellent end face strength. In the present invention, it is preferable that the length of the groove portion is formed with a size that is three times the adjacent value of the depth of the groove portion. Thereby, the bite of the blade ridge line toward the substrate and the suppression of the bite at the bottom of the groove can work well in a balanced manner, and can effectively form a vertical scribe line with high penetration.

Hereinafter, the slotted cutter wheel of the present invention will be described in detail based on the drawings. FIG. 1 is a perspective view showing the slotted cutter wheel A of the present invention, and FIG. 2 is a side view and a front view thereof. The slotted cutter wheel A is made of a metal material with excellent tool characteristics, such as cemented carbide or sintered diamond, single crystal diamond, etc., and has a bearing hole 2 for mounting in the center of the disc-shaped body 1 and a circumferential surface. A knife-edge ridge line 4 composed of left and right inclined surfaces 3a, 3a intersecting each other is formed. The diameter D of the slotted cutter wheel A is selected from 1 to 5 mm, but in this embodiment, it is formed by a blade tip angle α of 105 mm, where the diameter D is 2 mm and the left and right inclined surfaces 3a and 3a intersect, and It is formed with a thickness of 650 μm and an inner diameter of the bearing hole 2 of 0.8 mm. In addition, the slotted cutter wheel A of the present invention processes the slot portion 5 at a specific pitch P over the entire area of the blade tip ridge line 4 ..., and the slot portion 5 and the remaining blade tip ridge are alternately formed Line 6. In this embodiment, the pitch P of the groove portion 5 is set to 0.126 mm, the depth 5b of the groove portion 5 is 1.5 μm, and the length 5a in the circumferential direction of the groove portion 5 is approximately three times the depth 5b of the groove portion 5. 4.4 μm was formed. In this case, the length 6a in the circumferential direction of the blade ridge line portion 6 is a dimension obtained by subtracting the length 5a of the groove portion 5 from the pitch P. In the drawings, for ease of understanding, the ratios of the length 5a and depth 5b of the groove portion 5 and the length 6a of the ridge line portion 6 to the actual size are shown differently. In a cutter wheel with a diameter of 2 mm, the pitch P of the 126 μm dimension of the groove 5 can be obtained by dividing the entire circumference by 50. The expression is as follows: P = πD / n where D is the diameter (mm) of the cutter wheel and n is the number of divisions of the cutter wheel. In addition, the number of divisions n to obtain the desired pitch P size of 0.126 mm is: P = πD / P, for example, in a cutter wheel with a diameter of 3 mm, to obtain the desired pitch P size of 0.126 mm. The number of divisions is approximately 75 divisions from the above calculation formula. Similarly, in a cutter wheel with a diameter of 4 mm, the number of divisions to obtain a desired pitch P of 0.126 mm is about 100 divisions. The grooved cutter wheel A configured as described above is mounted on the scribing head 13 of the scribing device B shown in FIG. 8, and while pressing against the surface of the substrate W placed on the platform 14, it is relatively linearly moved. A cutting scribe line S is formed on the surface of the substrate W. At this time, in the grooved cutter wheel A of the present invention, by using the above-mentioned configuration as a condition, as shown in FIG. 4, even under the condition of a low load that is not prone to form a vertical crack on the substrate, it can be used. By biting into the substrate W, a high-permeability vertical crack required for breaking can be formed. Figure 4 shows the preparation of the above-mentioned 50-section slotted cutter wheel A, and a slotted cutter wheel having the same diameter of 2 mm and the same 105 ° tip angle as the slotted cutter wheel A. 5 For the division, 200 division, and 600 division, the average value of the rib amount L1 and the vertical crack amount L2 when each of the glass substrates W is subjected to a plurality of scribe tests with a scribe load of 0.02, 0.03, and 0.04 MPa. In addition, the length 5a and the depth 5b of the groove portion 5 at the time of 5 divisions, 200 divisions, and 600 divisions are set to be the same as the cutter wheel A with grooves of 50 divisions. The pitches at the time of 5 divisions, 200 divisions, and 600 divisions were calculated to be 1256 μm, 31.4 μm, and 10.5 μm, respectively. The glass substrate W to be processed is a single plate having a thickness of 0.2 mm. In addition, FIG. 5 is a graph showing each numerical data of FIG. 4, FIG. 5 (a) is a graph showing the depth of the ribs from the surface of the substrate, and FIG. 5 (b) is a graph showing the verticality of the ribs from the surface of the substrate. Depth of Crack. With this, in the 50-division slotted cutter wheel A of the present invention, in the lower scribe load area of 0.02 MPa, the rib amount L1, which is the deepest 30 μm or more compared with the others, is detected. And, although it is a lower scribe load of 0.02 MPa, the vertical crack amount L2 is larger than the others, and a value of 141.46 μm is detected. From this test data, it can be seen that even with a low scribe load of 0.02 MPa, ribs are surely formed on the glass substrate W, and vertical cracks with high permeability required for breaking are formed. Thereby, the substrate is not greatly deflected at the time of cracking, the cracking can be performed with a perfect fracture surface, and a unit product with excellent end face strength can be obtained. In particular, in a bonded substrate in which two glass substrates are bonded via a sealing portion, when the glass substrate is processed with a scribe line directly above the sealing portion, it can be processed with a small scribe line load without being affected by the existence of the sealing portion. Deep vertical cracks are produced, which is extremely effective. In addition, since the ratio of the groove portion to the length of the ridge line is small, it is possible to effectively form deep vertical cracks while suppressing the decrease in end face strength. In addition, although the hints of the test data are omitted, the depth and length of the groove with a diameter of 3 mm and a diameter of 75 mm divided by 75 with the same groove pitch have the same depth and length as the cutter wheel A with a groove of 2 mm in diameter described above. In the case of a cutting wheel with a diameter of 4 mm and a slotted cutting wheel with a diameter of 100 mm, it can also form ribs and heights with a depth similar to that of the slotted cutting wheel A with a diameter of 2 mm. Intact scribes that penetrate vertical cracks. The above-mentioned numerical values of the pitch P of the groove portion 5 of the cutter wheel A with groove, and the length 5a and depth 5b of the groove portion 5 are shown as the best examples. The present invention is not limited to the above values, but may be in the following Implemented within range. That is, it can implement within the range of the pitch P being 100-200 micrometers, the length 5a of the groove part 5 being 3-10 micrometers, and the depth 5b being 1-3 micrometers. In addition, the blade point angle α is not specifically 105 °, and a range of 90 to 120 ° is acceptable. In addition, the side shape of the groove portion 5 may be a V shape or an arc shape instead of the ladder shape shown in the figure. The representative embodiments of the invention have been described above, but the present invention is not specifically the above-mentioned embodiments, and can be appropriately modified and changed within the scope of achieving the purpose of the invention without departing from the scope of patent application. [Industrial Applicability] The present invention can be preferably applied to a cutter wheel used for processing a scribe line for breaking on the surface of a brittle material substrate such as glass or a bonded substrate on which two pieces of brittle material substrate are bonded.

1‧‧‧ main body

2‧‧‧bearing hole

3a‧‧‧ bevel

4‧‧‧Blade ridge line

5‧‧‧Slot

5a‧‧‧length of groove

5b‧‧‧ Depth of groove

6‧‧‧Blade ridge line

6a‧‧‧ Length of the ridge of the blade

7‧‧‧ rib

8‧‧‧ vertical crack

10‧‧‧Sealing Department

11‧‧‧LCD injection area

12‧‧‧ cutter wheel

13‧‧‧ crossed head

14‧‧‧platform

A‧‧‧Slotted cutter wheel

B‧‧‧ scribing device

D‧‧‧ diameter

L1‧‧‧ rib amount

L2‧‧‧Vertical Crack Amount

P‧‧‧ pitch

S‧‧‧ crossed

W‧‧‧ substrate

α‧‧‧ Blade angle

FIG. 1 is a perspective view of a slotted cutter wheel according to the present invention. 2 (a) and 2 (b) are a side view and a front view of a slotted cutter wheel according to the present invention. 3 (a) and 3 (b) are cross-sectional views showing scribe lines formed on a brittle material substrate. Fig. 4 is a graph showing the scribe test data of a cutter wheel with grooves having different division numbers. 5 (a) and 5 (b) are graphs showing the numerical data of FIG. 4. FIG. 6 is a plan view showing a bonded substrate to be processed. FIG. 7 is a sectional view of FIG. 6. FIG. 8 is a schematic front view of the scribing device.

Claims (3)

The utility model relates to a cutter wheel, which is formed on a circumferential surface of a V-shaped tip ridge line composed of two inclined surfaces that intersect each other. A groove portion is processed at a specific pitch over the entire area of the tip ridge line. The disc-shaped cutter wheel alternately formed with the remaining ridge line of the blade tip has a pitch of 100 to 200 μm, a length of the groove of 3 to 10 μm, and a depth of the groove of 1 to 3 μm. For example, the cutter wheel of claim 1, wherein the diameter of the cutter wheel is 1 to 5 mm, and the angle of the cutter point where the two inclined surfaces intersect is 90 to 120 °. For example, the cutter wheel of claim 1 or claim 2, wherein the length of the above-mentioned groove part is formed by the adjacent value of three times the depth of the groove part.