TWI752132B - cutter wheel - Google Patents

Abstract

The present invention provides a cutter wheel that can form a highly permeable and intact scribe line even with a small scribe line load and can be divided into unit products with excellent end face strength. The cutting wheel system of the present invention has a V-shaped cutting edge ridge line 4 formed by two inclined surfaces 3a and 3a intersecting with each other on the circumferential surface, and a groove portion is machined at a specific pitch P in the entire area of the cutting edge ridge line 4 5. The grooves 5 and the remaining edge ridges 6 are alternately formed, and by setting the pitch P to be 100 to 200 μm and the length 5a of the groove 5 to 3 to 10 μm, the grooves The depth 5b of 5 is set to 1 to 3 μm, and a scribe line S with high penetration can be formed with a small load.

Description

cutter wheel

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

In the past, a method has been generally known in which a cutting wheel is pressed against the surface of the substrate to form a scribe line in the process of dividing a brittle material substrate such as a glass substrate (hereinafter also referred to as a "substrate"), and thereafter, a scribe line is formed along the surface of the substrate. The scribe line is disclosed in Patent Document 1, for example, by applying an external force from the back side to deflect the substrate, thereby dividing the substrate into each unit substrate. The cutter wheel is used for cutting the scribing line on the brittle material substrate. The cutter wheel has a V-shaped cutting edge composed of two inclined surfaces intersecting with each other on the circumferential surface, and has a bearing hole for mounting in the center. As the above-mentioned cutter wheel, there are cutter wheels (hereinafter also referred to as "ordinary cutter wheels") in which the ridge line of the blade edge is smoothly finished, and grooves ( notched) cutter wheel (hereinafter also referred to as "grooved cutter wheel"). The scribe lines formed by these cutter wheels will be described with reference to FIG. 3 . Fig. 3 shows ribs and vertical cracks formed in the scribe line of the substrate, Fig. 3(a) is a sectional view along the scribe line direction, and Fig. 3(b) is a 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 substrate surface, that is, the plastic deformation area, and the vertical crack 8 generated right below the plastic deformation area and penetrated in the thickness direction of the substrate W. Characteristic marks called ribs 7 are produced over a specific depth above the vertical cracks 8 . L1 in FIG. 3 represents the rib amount (depth) from the surface of the substrate W, and L2 represents the vertical crack amount (penetration depth) from the substrate W surface. Using a common cutter wheel can form a perfect groove surface when scribing. Therefore, when scribing is started from the inside from the end face of the substrate, vertical cracks are not easily generated immediately after the scribing is started, and if the scribing load is increased to form deeper vertical cracks, horizontal cracks will occur on the surface of the substrate. Irregular cracks extending in the direction, or scratches on the grooves, make the frequency of defective products higher. On the other hand, in the cutter wheel in which grooves (cuts) are provided on the edge ridges, the grooves and the edge ridges (convex parts) are alternately formed. Thereby, a higher scribing load can be applied to the substrate than a conventional cutter wheel, a scribing line can be formed from a sufficiently deep vertical crack, and the occurrence of cracking in an irregular direction or a horizontal crack can be suppressed. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent No. 3787489

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 surface strength of the cut surface is required. Therefore, there is a need for a grooved cutter wheel capable of producing a high penetration, sound scribe with a lower scribe load. In particular, as shown in FIGS. 6 and 7 , in a bonded substrate having a plurality of liquid crystal injection regions 11 partitioned into a lattice shape by the sealing portion 10 , two glass substrates W and W are bonded together via the sealing portion 10 . Just above the sealing portion 10, when using the cutter wheel 12 to machine the scribe line S on the glass substrate W, the bite of the cutter wheel 12 may be deteriorated due to the elasticity of the sealing portion 10, and the normal scribing The problem of insufficient formation of ribs or vertical cracks under line load. In addition, if the scribing load is increased, the deflection of the glass substrate W increases, and irregular cracks extending in the horizontal direction are generated on the surface of the substrate, or damage such as scratches is generated in the groove portion, and the frequency of defective products is increased. .

Therefore, the object of the present invention is to provide a cutter wheel, which can form a highly permeable and intact scribe line on a brittle material substrate such as glass even with a lower scribing load than the previous scribing load. unit product.

In order to solve the above-mentioned problems, the present invention requires the following technical methods. That is, the present invention is a circular plate-shaped cutter wheel with a V-shaped cutting edge ridge line formed by two inclined surfaces intersecting with each other on the circumferential surface, and the entire area of the cutting edge ridge line is machined at a specific pitch. The grooves and the remaining edge ridges are alternately formed, and the pitch is 100 to 200 μm, the length of the grooves is 3 to 10 μm, and the depth of the grooves is in the range of 1 to 3 μm. .

Here, it is preferable that the diameter of the cutter wheel is set to 1 to 5 mm, and the angle of the blade edge at which the two inclined surfaces intersect is set to be 90 to 120°.

In the cutter wheel of the present invention, by being constituted under the above-mentioned conditions, even with a low scribing load, it is possible to reliably bite into the substrate to form ribs, and to form vertical cracks with high penetration required for slicing. Thereby, it can be fractured with an intact fractured surface without scratches, 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 through a sealing portion, when a scribe line is processed on the glass substrate just above the sealing portion, the following effects are obtained: it is not affected by the presence of the sealing portion and can be more A small scribing load produces a scribing line with deep ribs and high penetration vertical cracks, which can be broken at the subsection with excellent end face strength.

In this invention, it is preferable to form the length of the said groove part with the dimension which is three times the adjacent value of the depth of the said groove part. As a result, the bite of the ridge line of the blade edge into the substrate and the bite inhibition of the bottom of the groove can be well balanced, and a scribe line with a high penetration vertical crack can be effectively formed.

Hereinafter, the grooved cutter wheel of the present invention will be described in detail based on the drawings. FIG. 1 is a perspective view showing a grooved cutter wheel A of the present invention, and FIG. 2 is a side view and a front view thereof. The grooved cutter wheel A is made of a metal material with excellent tool properties, such as superhard alloy, sintered diamond, single crystal diamond, etc., and has a mounting bearing hole 2 in the center of the disc-shaped main body 1, and a bearing hole 2 on the circumferential surface. The blade edge ridge line 4 which consists of the left and right inclined surfaces 3a and 3a which cross each other is formed. The diameter D of the cutter wheel A with grooves is selected from 1 to 5 mm, but in this embodiment, the diameter D is 2 mm, the angle α of the cutting edge where the left and right slopes 3a and 3a intersect is 105°, and It is formed with a thickness of 650 μm and an inner diameter of the bearing hole 2 of 0.8 mm. Furthermore, the grooved cutter wheel A of the present invention processes grooves 5 . . . in the entire area of the ridgeline 4 of the cutting edge at a specific pitch P, and by alternately forming the grooves 5 and the remaining ridges of the cutting edge Line 6 is formed. 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 of the groove portion 5 in the circumferential direction is about 3 times the depth 5b of the groove portion 5. of 4.4μm formed. In this case, the length 6a in the circumferential direction of the blade edge ridge line portion 6 is a dimension obtained by subtracting the length 5a of the groove portion 5 from the pitch P. As shown in FIG. In addition, in the drawings, for ease of understanding, the ratio of the length 5a and the depth 5b of the groove portion 5 and the length 6a of the blade edge ridge portion 6 to the actual size is shown differently. In a cutter wheel with a diameter of 2 mm, the pitch P of the size of 126 μm of the groove portion 5 can be obtained by dividing its entire circumference by 50. The formula is expressed as follows: P=πD/n Among them, D is the diameter of the cutter wheel (mm), and n is the number of divisions of the entire circumference of the cutter wheel. Also, the number of divisions n used to obtain the desired pitch P with a size of 0.126 mm is: P=πD/P , for example, in a cutter wheel with a diameter of 3 mm, the desired pitch P with a size of 0.126 mm is obtained The number of divisions is approximately 75 divisions from the above calculation formula. Likewise, in a cutter wheel with a diameter of 4 mm, the number of divisions of size 0.126 mm to obtain the desired pitch P is about 100 divisions. The grooved cutter wheel A constructed as above is installed on the scribing head 13 of the scribing device B shown in FIG. In this way, a scribe line S for breaking is processed on the surface of the substrate W. As shown in FIG. 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. Indeed, it bites into the substrate W, and a vertical crack with high penetration required for breaking can be formed. Figure 4 shows the above-mentioned 50-segmented cutting wheel A with grooves, and the cutting wheel with grooves with the same 2 mm diameter and 105° cutting edge angle as the cutting wheel A with grooves, respectively 5 For division, 200 division, and 600 division, the average value of the rib amount L1 and the vertical crack amount L2 when the glass substrate W was subjected to a plurality of scribing tests with scribing loads of 0.02, 0.03, and 0.04 MPa. In addition, the length 5a and the depth 5b of the groove part 5 at the time of 5 division, 200 division, and 600 division were set to be the same as that of the cutter wheel A with a groove of 50 division. In addition, the pitches at the time of 5 division, 200 division and 600 division are calculated to be 1256 μm, 31.4 μm, and 10.5 μm, respectively. In addition, as the glass substrate W to be processed, a single plate having a thickness of 0.2 mm was used. Furthermore, Fig. 5 is a graph showing the numerical data of Fig. 4, Fig. 5(a) shows the depth of the rib from the surface of the substrate, and Fig. 5(b) shows the vertical direction including the rib from the surface of the substrate The depth of the crack. As a result, in the 50-segment grooved cutter wheel A of the present invention, the deepest rib amount L1 of 30 μm or more was detected in the low scribe load region of 0.02 MPa. In addition, despite the low scribe load of 0.02 MPa, the vertical crack amount L2 was larger than the others, and a value of 141.46 μm was detected. From the test data, it can be seen that even with a low scribe load of 0.02 MPa, ribbing is surely formed on the glass substrate W, and vertical cracks with high penetration required for breaking are formed. Thereby, the substrate is not greatly deflected when it is fractured, the fracture can be performed with an intact fracture surface, and a unit product with excellent end surface strength can be obtained. Especially in the case of laminating the two glass substrates through the sealing part, when the glass substrate is scribed directly above the sealing part, it can be processed with a small scribing load without being affected by the existence of the sealing part. It produces deep vertical cracks and 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 a deep vertical crack while suppressing a decrease in the strength of the end face. In addition, although the indication of the test data is omitted, in the cutting wheel A with the same groove depth and length as the above-mentioned additional grooves with a diameter of 2 mm, and the additional grooves with a diameter of 3 mm divided by 75 at the same groove pitch In the case of a cutter wheel with a diameter of 4 mm divided by 100, or a cutter wheel with grooves with a diameter of 4 mm divided by 100, it is also possible to form ribs with a depth and height similar to the above-mentioned cutter wheel A with a diameter of 2 mm. Penetrating vertical cracks with perfect scoring lines. The above-mentioned numerical value system of the pitch P of the groove portion 5 of the grooved cutter wheel A, and the length 5a and the depth 5b of the groove portion 5 are shown as the best examples. The present invention is not limited to the above-mentioned numerical values. implemented within the scope. That is, the pitch P can be implemented in the range of 100 to 200 μm, the length 5a of the groove portion 5 is 3 to 10 μm, and the depth 5b is 1 to 3 μm. In addition, the cutting edge angle α is not specifically set to 105°, and the range of 90 to 120° is acceptable. Furthermore, the shape of the side surface of the groove portion 5 may be a V-shape or a circular arc shape instead of the trapezoid shape shown in the figure. The representative embodiments of the invention have been described above, but the present invention is not limited to the above-mentioned embodiments, and appropriate modifications and changes can be made within the scope of achieving the object of the present invention without departing from the scope of the patent application. INDUSTRIAL APPLICABILITY The present invention can be preferably applied to a cutter wheel used for processing a scribing line for cutting on the surface of a brittle material substrate such as glass or a bonded substrate in which two brittle material substrates are bonded.

1‧‧‧Main body 2‧‧‧Bearing hole 3a‧‧‧Chamfer 4‧‧‧Cut ridge line 5‧‧‧Slot 5a‧‧‧Length of groove 5b‧‧‧Depth of groove 6‧‧‧ Blade ridge 6a‧‧‧Length of blade ridge 7‧‧‧Ribbon8‧‧‧Vertical crack 10‧‧‧Sealing part 11‧‧‧LCD injection area 12‧‧‧Cutter wheel 13‧ ‧‧Scribing head 14‧‧‧Platform A‧‧‧Cutter wheel B‧‧‧Scribing device D‧‧‧Diameter L1‧‧‧Rib length L2‧‧‧Vertical crack amount P‧‧‧ Pitch S‧‧‧Scribing W‧‧‧Substrate α‧‧‧Tool nose angle

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

1‧‧‧Subject

3a‧‧‧Slope

5‧‧‧Slots

5a‧‧‧Length of groove

5b‧‧‧Depth of groove

6‧‧‧Ridge of blade tip

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

D‧‧‧diameter

P‧‧‧ pitch

α‧‧‧Tool nose angle

Claims (2)

A cutter wheel, which is a disc-shaped cutter wheel, and has a V-shaped cutter tip ridge line formed by two inclined surfaces intersecting with each other on the circumferential surface, and the entire area of the cutter tip ridge line is machined at a specific pitch. The grooves are alternately formed with the remaining edge ridges, the pitch is 100-200 μm, the length of the grooves is 3-10 μm, and the depth of the grooves is 1-3 μm. As claimed in claim 1, the cutter wheel, wherein the diameter of the cutter wheel is 1~5mm, and the angle of the cutting edge at the intersection of the two inclined surfaces is 90~120°.

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