JPH11254332A - Wax grindstone and edge-face abrasive method of glass substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wax grindstone which can be reused after regeneration and an edge-face abrasive method of a glass substrate. SOLUTION: A wax grindstone 1 for abrading a glass substrate 5 is so composed that a board-like grindstone body 2 is formed by mixing abrasive grains with wax, and that plural long grooves 4 for edge-face abrasion of the glass substrate 5 are formed in parallel on the upper surface of the grindstone body 2. And the edge-face abrasive method of the glass substrate 5 is mentioned as follows. A rotary shaft 10 is inserted into the center hole of plural glass substrates 5, and the glass substrate 5 are set at specific intervals by fitting their centers 6 of the thickness side to the centers 6 of the width of the long grooves 4 of the wax grindstone 1. The rotary shaft 10 is rotated in a high speed, and simultaneously edge faces of the glass substrates 5 are pushed in the direction of the wax grindstone 1. The rotary shaft 10 is moved so that the glass substrates 5 may be moved along the long grooves 4 of the wax grindstone 1, and simultaneously abrasive parts are cooled by water, to thereby abrade the edge faces of the glass substrates 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wax grindstone for polishing an end face of a glass substrate or the like and a method of polishing the end face of a glass substrate.

[0002]

2. Description of the Related Art Conventionally, a doughnut-shaped glass substrate has been used for a hard disk of a computer. The outer peripheral end surface of the glass substrate is roughly ground and polished by a grinder, and then the finish polishing is performed by a grinder equipped with a grindstone made of a first rare earth element such as cerium, so that the end surface is mirror-polished.

More specifically, as shown in FIG. 3A, a rough-cut glass substrate 100 is set on a rotating shaft 105,
The glass substrate 100 is fixed to the rotation shaft 105 by the stopper 106. In addition, a grindstone 110 containing abrasive grains such as cerium oxide having the shape of the groove 111 of the finished shape of the glass substrate 100 on the circumference is fixed to the rotating shaft 115 with the stopper 116.

The rotating shaft 105 of the glass substrate 100 is rotated as shown by the arrow, and the rotating shaft 115 of the grindstone 110 is also rotated at a high speed as shown by the arrow. Then, the end surface of the glass substrate 100 is pushed into the groove 111 of the grindstone 110 to finish-polish the outer peripheral end surface of the glass substrate 100.

[0005]

However, when the outer peripheral end face of the glass substrate 100 is polished as described above, FIG.
As shown in (b), a whetstone 1 made of soft cerium oxide
The ten groove portions 111 are immediately deformed and the glass substrate 100 cannot be polished continuously. Therefore, the shape of the groove 111 must be frequently corrected (also called truing). Also, once the shape is corrected, only a few dozen polishing processes can be performed. For this purpose, the shape must be corrected frequently. In addition, the apparatus has to be adjusted in accordance with the reduction in the amount of grinding wheel each time, resulting in an increase in cost.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a reusable wax whetstone and a method for polishing an end face of a glass substrate.

[0007]

Means for Solving the Problems and Effects of the Invention A wax whetstone according to claim 1 for achieving the above object is a wax whetstone for polishing an object to be polished, which is a solid oil and fat at room temperature. The abrasive body is formed by mixing abrasive grains with wax.

According to the first aspect of the present invention, the object to be polished can be polished at room temperature because the wax has a property of being solid at room temperature. When the shape of the wax grindstone is damaged, the wax grindstone can be easily regenerated by heating and melting the wax grindstone.

According to a second aspect of the present invention, in the wax grinding stone according to the first aspect, a plurality of straight long grooves for polishing an end face of a glass substrate are provided in parallel on the upper surface of the grinding stone main body at a constant interval. And According to the second aspect of the present invention, since only a plurality of straight long grooves are provided in parallel on the upper surface of the grindstone main body at a constant interval, the grooving of the wax grindstone can be easily performed.

Since the main body of the grindstone is made of wax, it can be easily grooved with a heated spatula. The method for polishing an end face of a glass substrate according to claim 3 is the method for polishing an end face of a glass substrate using the wax grindstone according to claim 2, wherein a rotating shaft is inserted through a center hole of a plurality of donut-shaped glass substrates, The center of the thickness of the glass substrate is aligned with the center of the width of the long groove of the wax grindstone and set at a constant interval, and the end face of the glass substrate is aligned with the long groove of the wax grindstone while rotating the rotating shaft at a high speed. Push in and polish the end surface of the glass substrate while simultaneously moving the rotating shaft and / or the wax grindstone and cooling the polishing unit so that the glass substrate moves along the long groove of the wax grindstone. It is characterized by the following.

According to the third aspect of the present invention, since a plurality of glass substrates are set on the rotating shaft and polished while rotating the rotating shaft, the end faces of a plurality of glass substrates can be polished at once. In addition, since the polishing is performed while cooling the polishing section, the wax grindstone does not soften due to frictional heat.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a wax whetstone according to an embodiment of the present invention. FIG. 2 is a front view illustrating a state of the glass substrate end surface polishing set.

As shown in FIG. 1, a wax whetstone 1 has a plurality of straight long grooves 4 formed by cutting a corner having the same shape as a finished end surface shape of a glass substrate 5 on an upper surface 3 of a plate-shaped whetstone main body 2. Are provided in parallel at intervals. Next, a manufacturing process of the wax grindstone 1 will be described.

A wax (Sky K-41, manufactured by Nikka Seiko Co., Ltd.), which is a solid oil at normal temperature, is heated to a temperature of 180 ° C. or higher to melt the wax. Next, Ce
Particle size of first rare earth element such as O ₂ , La ₂ O ₃ : 1
Abrasive grains of μm or less (Mirek S-0, manufactured by Mitsui Kinzoku Mining Co., Ltd.) are mixed at a weight ratio of abrasive grains of 2 to a weight ratio of wax of 8, and the abrasive grains are uniformly distributed in the molten wax. Stir so that Then cool down and the width is 160m
The plate-shaped grindstone main body 2 having a length of m, a length of 200 mm, and a thickness of 40 mm is formed.

Next, a heated spatula is applied in the longitudinal direction of the upper surface 3 of the grindstone body 2 to melt the wax, and the long straight groove 4 which is the same as the finished end surface of the glass substrate 5 (here, about 20 μm with respect to the thickness of the glass substrate) A plurality of long narrow grooves) are formed in parallel. Thus, the wax grindstone 1 is manufactured.

Thus, the glass substrate 5 can be polished at room temperature because the wax has a property of being solid at room temperature. When the shape of the wax grindstone 1 is damaged, the wax grindstone 1 can be easily regenerated by heating and melting. Also, the upper surface 3 of the whetstone body 2
Since only a plurality of straight long grooves 4 are provided in parallel at a constant interval, the groove forming of the wax grindstone 1 can be easily performed.

Since the grinding wheel body 1 is made of wax, it can be easily grooved with a heated spatula. Next, a method of polishing the end face of the glass substrate 5 will be described. As shown in FIG. 2, the diameter of the end face is roughly cut 100 mm, and the center hole diameter is 20 m.
The rotating shaft 10 is inserted through a central hole of a donut-shaped glass substrate 5 having a thickness of 1 mm and a thickness of 1 mm, and cylindrical spacers 11 are sandwiched between the respective glass substrates 5.
The glass substrate 5 is attached at a constant interval so that the center of the thickness of the glass substrate 5 is aligned with the center of the width of the glass substrate 5. The plurality of glass substrates 5 are firmly fixed to the rotating shaft 10 by the stoppers 13, 13, and the glass substrate 5 is set on the rotating shaft 10.

Next, both the center 6 on the thickness side of the glass substrate 5 and the center of the long groove 4 are aligned to form a rotating shaft 10.
The rotating shaft 10 is moved in the direction of the wax grindstone 1 while rotating at a high speed of 3000 rpm, and the end face of the glass substrate 5 is pushed into each long groove 4 as shown by an arrow A, and the glass is moved along the long groove 4. The end face of the glass substrate 5 is polished by moving the rotating shaft 10 at a speed of 40 mm / sec in the depth direction of the paper while rotating the substrate 5.

When the end face is polished, cooling water 8 is discharged from the water supply pipe 7 to sufficiently cool the polished portion to prevent the wax from softening. In this manner, the end faces of the plurality of glass substrates 5 can be efficiently polished by one polishing.

In this case, the wax grindstone 1 can be repeatedly used as a raw material of the wax grindstone 1 after it has been used once. Further, a plurality of glass substrates 5 are
Is set and polishing is performed while rotating the rotating shaft 10, so that the end faces of a plurality of glass substrates 5 can be polished at once.

Since the polishing is performed while cooling the polishing section, the wax grindstone 1 does not soften due to frictional heat. As described above, the embodiments of the present invention have been described. However, various embodiments can be made without departing from the spirit of the present invention. For example, in the embodiments of the present invention, description has been made using abrasive grains made of the first rare earth element. However, the abrasive grains are made of silicon carbide,
Alumina, diamond carbon or the like may be used. In the embodiment of the present invention, the corners of the long groove 4 are cut, but the groove may have any shape such as a U-shaped groove or a V-shaped groove.

In the embodiment of the invention, the glass substrate 5 is moved along the long groove. However, the wax grindstone 1 may be moved in the long groove direction, or the glass substrate and the wax grindstone may be moved along the long groove. May be moved at the same time in the facing direction. The shape of the wax grindstone may be any shape as long as it matches the object to be polished.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a main part of a wax whetstone according to an embodiment of the present invention.

FIG. 2 is a front view illustrating a state of a set for polishing a glass substrate end face according to the embodiment of the present invention.

FIG. 3 is an explanatory view of a conventional grindstone.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wax whetstone, 2 ... Whetstone main body, 3 ... Top surface, 4 ... Long groove, 5 ... Glass substrate, 6 ... Center, 10 ... Rotation axis.

Claims (3)

[Claims] 1. A wax whetstone for polishing an object to be polished, wherein a whetstone main body is formed by mixing abrasive grains with a solid oil wax at room temperature. 2. The wax grindstone according to claim 1, wherein a plurality of straight long grooves for polishing an end face of the glass substrate are provided in parallel on the upper surface of the grindstone main body at a predetermined interval. 3. A method for polishing an end face of a glass substrate using a wax grindstone according to claim 2, wherein a rotation shaft is inserted into a center hole of a plurality of donut-shaped glass substrates, and a width of a long groove of the wax grindstone is determined. The center on the thickness side of the glass substrate is aligned with the center and set at a fixed interval. The end face of the glass substrate is pushed into the long groove of the wax grindstone while rotating the rotating shaft at a high speed. A glass substrate, characterized in that an end surface of a glass substrate is polished while simultaneously moving the rotating shaft and / or the wax whetstone or both so as to move along a long groove of the wax whetstone, and cooling a polishing part. End face polishing method.