TW201441172A - Scribing wheel and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a scribing wheel and its manufacturing method thereof. The subject addressed by the present invention is that to a scribing wheel with V-shaped blade tips formed on the periphery of a circular sheet-like wheel, the end face strength of a brittle material substrate cut by scribing is enhanced. Rough grinding is used to form V-shape on the periphery of the scribing wheel to fabricate a grinding surface 13, and then a grinding surface 16 is formed by fine grinding in such a way that the required top angle alpha-2 is formed at the front terminal portion. Then the grinding surface 16 is treated by the ultra-fine grinding to form a grinding surface 17. Accordingly, the unevenness at the ridge line of the blade tips can be reduced, and the end face strength of the brittle material substrate during scribing can be increased.

Description

Scribing wheel and manufacturing method thereof

The present invention relates to a scribing wheel for scribing a brittle material substrate such as a glass substrate and a method of manufacturing the same.

The conventional scribing wheel system is formed by cutting a circumferential portion of a disc made of a superhard alloy or a sintered diamond from the both sides obliquely, and forming a V-shaped blade edge on the circumferential surface. The center of the scribing wheel has a through hole and is rotatably and axially fixed to a scribe head of the scribing device or the like for use.

Previously, in order to form a V-shaped blade edge on the circumferential surface of the scribing wheel, a through hole 102 was first formed at the center of the disk 101. Fig. 1(a) shows a side view of the circular plate 101. Next, as shown in the side view in Fig. 1(b) and the front view in Fig. 1(c), the circumferential portion is ground into a V shape from both sides to form the blade edge portion 103. In some cases, the blade tip portion 103 is finely ground by an abrasive having a finer particle size to constitute the scribing wheel 100.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Patent No. 3759913

When a brittle material substrate such as a glass substrate is cut, the scribing wheel is used for scribing and then cut along a scribe line, but since scratches remain on the end surface of the cut brittle material substrate, There are many cases where cracks are generated from the end faces when pressure is applied. If formed in When the V-shaped blade edge of the circumferential surface of the scribing wheel has irregularities, scratches remain on the end surface of the brittle material substrate when cutting, so that the mechanical strength of the brittle material substrate is lowered. Therefore, it is preferable to make the unevenness on the ridge line of the V-shaped blade tip of the scribing wheel as small as possible. In recent years, it has been desired to realize thinning of a glass substrate used in a flat panel display or the like, and further, in a small device such as a mobile device, the thickness of the glass is reduced to, for example, 0.4 mm to 0.2 mm. Since the strength of the substrate is lowered by the use of such a thin glass, the decrease in the end face strength of the brittle material substrate becomes a major problem.

In order to reduce the unevenness of the ridge line of the scribing wheel, it is necessary to use a finer abrasive for the grinding. However, in the case of the conventional scribing wheel, rough grinding and fine grinding are performed on the same area in order to form a V-shaped blade tip. The smaller the particle diameter of the abrasive, the more difficult it is to perform polishing. Therefore, when fine polishing is performed, the smaller the particle diameter of the polishing agent used, the longer the processing time.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a scribing wheel which is capable of shortening a grinding processing time when forming a V-shaped blade edge with respect to a scribing wheel, and a method of manufacturing the same.

In order to solve the problem, the present invention provides a method for manufacturing a scribing wheel, wherein the scribing wheel is formed by forming a V-shaped blade edge along a circumferential portion of a disc-shaped wheel, and the method for manufacturing the scribing wheel is A through hole is formed at a center position of the circular plate, and the first polishing surface is formed by rough grinding so as to be inclined obliquely from both sides of the side surface along the circumference of the circular plate, thereby forming the circumferential portion to have the first apex angle. In the V shape, only the front end portion of the V-shaped first polishing surface is subjected to finish polishing to form a second polishing surface, and the blade tip portion having a second apex angle larger than the first apex angle is applied to the second portion. The polished surface is super-finely ground.

In order to solve the problem, the present invention is a method for manufacturing a scribing wheel, which is formed by forming a V-shaped blade edge along a circumferential portion of a disc-shaped wheel, and the method for manufacturing the scribing wheel is a through hole is formed at a center of the circular plate to be self-side along the circumference of the circular plate The both sides are formed by rough grinding to form a first polishing surface, and the circumferential portion is formed into a V shape having a first apex angle, and the V-shaped first polishing surface is subjected to finish polishing. The second polishing surface is formed, and only the front end portion of the second polishing surface is superfinished as a blade tip portion having a second vertex angle larger than the first vertex angle.

The abrasive used in the above ultrafine polishing is preferably 6,000 or more, preferably 8,000 or more, and more preferably 10,000 or more. When the particle size is 3,000 or less, there is a tendency that scratches tend to remain on the end surface of the cut brittle material substrate.

In order to solve the problem, the scribing wheel of the present invention has a first polishing surface formed in a V shape so as to become a first apex angle along the circumferential portion of the disk-shaped wheel, and has a ridge at the front end of the first polishing surface. The wire has a second polishing surface that is larger than the second apex angle of the first apex angle.

According to the invention having such a feature, the blade edge of the scribing wheel is roughly ground to form a V-shape, and only the tip end portion thereof is subjected to finish grinding, followed by superfinishing. Therefore, the unevenness of the ridge portion which is necessary as the blade edge can be reduced. Therefore, an excellent effect can be obtained in that the end face strength can be enhanced when the squeegee substrate is cut using a scribing wheel. Such features are particularly effective when scribing and cutting thinner brittle material substrates.

11‧‧‧marking wheel

12‧‧‧through holes

13~17‧‧‧Grinding surface

20, 21‧‧‧ test strips

31‧‧‧Base

32, 33‧‧‧ support table

34, 35‧‧‧ Pressing Department

36‧‧‧ Pressurization

100‧‧‧marking wheel

101‧‧‧ round board

102‧‧‧through holes

103‧‧‧The tip of the knife

Α1, α2‧‧‧ vertices 1

1(a) to (c) are a side view and a front view showing a scribing wheel and a manufacturing process thereof in a conventional example.

2(a) and 2(b) are a front view and a side view of a scribing wheel in an embodiment of the present invention.

3(a) to 3(d) are side views showing the manufacturing process of the scribing wheel in the embodiment.

Fig. 4 is an enlarged view showing a portion of the front end portion of the scribing wheel after superfinishing.

Fig. 5 is a view showing a test state of the mechanical strength of the scribing wheel.

6(a) to 6(d) are side views showing the manufacturing process of the scribing wheel in another embodiment of the present invention.

Fig. 2 (a) is a front view of the scribing wheel in the embodiment of the present invention, and Fig. 2 (b) is a side view thereof. 3(a) to 3(d) are side views showing the manufacturing process of the scribing wheel in the present embodiment. When the scribing wheel is manufactured, first, as shown in Fig. 3 (b), a through hole 12 as a shaft hole is formed in the center of the disc 11 shown in Fig. 3 (a). Then, the rotating shaft of the motor or the like is communicated with the through hole 12 and rotated, and the entire circumference of the circular plate 11 shown in FIG. 3(a) is roughly ground from both sides, thereby being as shown in FIG. 3(b). It is formed in a V shape as shown. In the coarse grinding step, grinding is carried out using, for example, a fine powder abrasive having a particle size of 300. The polished surface thus formed is referred to as a polished surface 13. Grinding is performed such that the apex angle α1 at this time is sharper than the apex angle necessary for the cutting edge. The apex angle α1 is preferably 15° to 140°, preferably 60° to 120°, and more preferably 80° to 100°. When the thickness is 15° or less, the tip end of the ridge line is easily broken during processing, and when it is 140° or more, the practicality of the blade tip tends to be lost.

Next, the polished surface 13 polished by the rough grinding is subjected to finish polishing. In the fine grinding, for example, a fine powder abrasive having a particle size of 2000 is used. In the finish grinding, the shape is hardly changed as shown in Fig. 3(c). The polishing surface thus formed is referred to as a polishing surface 14.

Further, in the present embodiment, as shown in Fig. 3(d), only the tip end portion is subjected to superfinishing. In the ultrafine polishing, the polishing is carried out using a fine powder abrasive having a particle size of 6000 or more. Moreover, in this step, only the front end portion is ground to have a desired apex angle α2 (α2 > α1). Fig. 4 is an enlarged view showing the front end portion. The polished surface obtained by the superfinishing process thus formed was taken as 15. Here, the particle size of the abrasive is preferably 6,000 or more, preferably 8,000 or more, and more preferably 10,000 or more. When the particle size is 3,000 or less, there is a tendency that scratches are likely to remain on the end surface of the cut brittle material substrate. Here, the apex angle α2 is preferably from 90 to 140, preferably from 95 to 125, and more preferably from 100 to 115. The scribing wheel with a larger apex angle α2 is suitable for use under a higher scribing load, and the scribing wheel with a smaller apex angle α2 is suitable for use under a lower scribing load.

Therefore, there is a tendency to make only the V-shape of the two segments by the blade tip. Ultra-fine grinding of the front end portion of the cutting edge necessary for the scribing wheel reduces the machining area, thereby shortening the machining time and reducing the unevenness of the blade edge ridge.

Therefore, if the slash wheel having a sharp ridge line is used to scribe the brittle material substrate, the scratches on the cut surface of the brittle material substrate can be reduced, and the brittle material can be reinforced. Substrate end face strength. The end face strength of the brittle material substrate is the main factor governing the mechanical strength of the brittle material substrate after cutting. Therefore, in order to confirm the effect of the scribing wheel in the present embodiment, the mechanical strength of the brittle material substrate cut by the conventional scribing wheel is compared with the present embodiment. Fig. 5 shows an example of a test apparatus for performing a strength test of four-point bending strength. In this test, a glass plate which was cut into a 40 mm × 50 mm 0.3 mm thick was used as the test pieces 20 and 21. The test piece 20 was cut using a conventional scribing wheel, and the test piece 21 was cut using the scribing wheel of the present embodiment.

As shown in FIG. 5, the support bases 32 and 33 are arranged on the upper surface of the base 31 at a predetermined interval, for example, at intervals of 20 mm, and the lined surface of the test piece 20 (21) as a sample is placed downward. The upper portions of the above-mentioned support tables 32, 33. The pressurizing portion 36 having the pressing portions 34 and 35 having a gap of 10 mm was placed on the upper portion of the test piece 20, and pressed uniformly, and the pressure until the break was measured. Next, when the pressure applied from the upper portion was 84.8 N on average, the test piece 20 using a conventional scribing wheel was broken from the end surface. On the other hand, when the test piece 21 cut by the scribing wheel of this embodiment was used, it was confirmed that the average cracking pressure was 103.6 N, and the end surface strength was enhanced.

Further, in the present embodiment, the scribing wheel of the circular plate is roughly ground to have a V shape, and further fine polishing is performed, and then only the tip end portion is superfinished to have a desired angle. This may not be the case, but the polishing is performed such that the angle of the front end becomes the desired apex angle α2 during the finish polishing. Fig. 6 is a view showing the manufacturing process of the embodiment. In this case, the entire circumference of the circular plate 11 shown in Fig. 6(a) is roughly ground to be ground into a V shape as shown in Fig. 6(b). Thereafter, only the front end portion is ground to have an apex angle α2. The polished surface at this time was taken as 16. Then use it as shown in Figure 6(d). Ultra-fine grinding grinds the polished surface 16 of the front end. The polished surface at this time was set to 17. The abrasive used in the rough polishing, the fine polishing, and the ultrafine polishing is the same as the abrasive used in the above embodiment. The apex angles α1, α2 are also the same as described above. In this case, since the apex angle α2 is obtained in the stage of fine polishing, the efficiency of the manufacturing step can be made higher.

Further, of course, the particle size of the abrasive shown here is only an example, and is not limited to the particle size.

[Industrial availability]

The scribing wheel train of the present invention described above can be used in a scribing apparatus for scribing a brittle material substrate, and is particularly effective for a scribing apparatus for scribing a thin brittle material substrate.

11‧‧‧marking wheel

12‧‧‧through holes

13,16,17‧‧‧ polished surface

11‧‧‧Top angle 1

Claims (5)

A method for manufacturing a scribing wheel, wherein the scribing wheel is formed by forming a blade edge having a ridge line along a circumferential portion of the disk-shaped wheel, wherein the scribing wheel is manufactured by rough grinding the blade tip The first polishing surface is formed, and the angle formed by the first polishing surface is regarded as a first apex angle, and the first apex angle is 80° or more, and only the front end portion of the first polishing surface is polished to form a second apex. The polishing surface is superfinished as the blade tip having a second apex angle larger than the first apex angle, and the second polishing surface is formed so as to form the second apex angle by 90° to 140°. A method for manufacturing a scribing wheel, wherein the scribing wheel is formed by forming a blade edge having a ridge line along a circumferential portion of a disk-shaped wheel, wherein the scribing wheel is manufactured by rough grinding the blade tip The first polishing surface is formed, and the angle formed by the first polishing surface is regarded as a first apex angle, and the first apex angle is 80° or more, and the V-shaped first polishing surface is subjected to finish polishing to form a second polishing. In the surface, only the front end portion of the second polishing surface is superfinished so as to form the second apex angle of 90° to 140°, and the blade tip portion having the second apex angle larger than the first apex angle. The method for producing a scribing wheel according to claim 1 or 2, wherein the second polishing surface is subjected to superfinishing polishing using an abrasive having a particle size of 10000 or more. A scribing wheel having a first polishing surface along a circumferential portion of a disk-shaped wheel and having a V-shaped blade having a ridge line, and an angle formed by the first polishing surface is regarded as a first vertex angle, The first apex angle is 80° The second polishing surface having a second vertex angle larger than the first vertex angle on the ridge line at the front end of the first polishing surface, the second polishing surface is superfinished, and the second apex angle is 90°. ~140°. The method for producing a scribing wheel according to claim 4, wherein the second polishing surface is subjected to superfinishing polishing using an abrasive having a particle size of 10000 or more.