JP2003175470A - Grinding wheel, and method of working hole using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformly and smoothly work an inner face of a working hole in glass and a ceramic, without damaging the inner face. <P>SOLUTION: In this grinding wheel 10, there are provided a base 11 and an abrasive grain member 12, and the abrasive grain member 12 has a tapered shape. In this hole working method, a tapered angle of the abrasive grain member 12 is made 84.3-89.9°. A glass material or a ceramic material is fixed to a honing machine, the grinding wheel 10 is set to the honing machine, the wheel 10 is presses in the glass material or the ceramic material, while rotated, to be moved vertically with respect to the glass material or the ceramic material, and prescribed hole working is conducted thereby. A rotating speed of the grinding wheel 10 is made 500-5000 rpm. A speed of a reciprocating motion of the wheel 10 is made 1.0 mm/min-50 mm/min. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding wheel for making holes in a glass material or a ceramic material and a hole making method using the grinding stone.

[0002]

2. Description of the Related Art Conventionally, a honing machine or the like has been used for making a small-diameter hole in a glass material or a ceramic material. Glass material or ceramic material (hereinafter,
Described as "workpiece". 1), the workpiece is first fixed to a honing machine (not shown), and the honing machine is provided with a cylindrical base 1 and a base 1 having the same central axis as shown in FIG. A rotatable grinding wheel 3 composed of a cylindrical abrasive grain 2 having a diameter larger than that of the base 1 is set. Next, while the grinding wheel 3 is being rotated, the grinding stone 3 is pushed into the work material and reciprocally moved in the vertical direction with respect to the work material, thereby performing a predetermined hole drilling.

[0003]

In the drilling using the grinding wheel 3, when a drilled hole having a certain length is drilled in the workpiece, deep scratches such as cracks may be formed on the inner surface of the drilled hole. . The scratches formed on the glass material or the ceramic material cause a serious problem in terms of quality, for example, the strength thereof is significantly reduced. One of the causes of the scratches is glass powder or ceramic powder produced when a glass material or a ceramic material is ground. The glass powder or the ceramic powder is sandwiched between the side surface of the abrasive grain 2 and the inner surface of the processed hole of the workpiece, and deep scratches the inner surface of the processed hole of the workpiece. The reason why the glass powder or the ceramic powder is sandwiched between the side surface of the abrasive grain 2 and the inner surface of the processed hole of the workpiece is as follows. The inner diameter of the processing hole formed in the workpiece by the grinding wheel 3 is
Since the outer diameter of the abrasive grain 2 is almost equal to that of the
This is because it is difficult to discharge the scraped powder from the processed hole smoothly.

The present invention has been made in view of the above circumstances, and provides a grinding wheel that can be machined uniformly and smoothly without damaging the inner surface of a machined hole of glass or ceramics, and a hole machining method using the same. The challenge is to provide.

[0005]

The above problems can be solved by a grinding wheel provided with a substrate and an abrasive grain, wherein the abrasive grain has a tapered shape. The taper angle of the abrasive grains is preferably 84.3 to 89.9 degrees. Further, the above-mentioned problem can be solved by a hole drilling method in which a predetermined hole is drilled by pushing the work into a work material while rotating the grinding wheel and moving it in a direction perpendicular to the work material. The rotation speed of the grinding wheel is preferably 500 to 5000 rpm. The reciprocating speed of the grinding wheel is 1.0 mm / min to 50 m
It is preferably m / min.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
FIG. 1 is a front view showing an example of the grinding wheel of the present invention.
The grinding wheel 10 of this example includes a cylindrical base 11 and a base 1.
1 is provided with one end having the same central axis as that of the base 1 and has a tapered abrasive grain body 12 whose diameter gradually increases from the joint with the base body 11 toward the tip of the grinding wheel 10. There is.

The diameter and length of the base body 11 are appropriately set in accordance with the size of a hole machined in the glass or ceramic material by using the grinding wheel 10. Also, the abrasive grain 1
In No. 2, the diameter of the upper surface 12a is larger than the diameter of the base body 11, and the diameter of the bottom surface 12b is larger than the diameter of the upper surface 12a. The size of the abrasive 12 is also the base 1
Similar to No. 1, it is appropriately set according to the size of the processed hole.

The taper angle of the abrasive 12 (angle d between the bottom surface 12b of the abrasive 12 shown in FIG. 1 and the hypotenuse 12c) is preferably 84.3 to 89.9 degrees.
More preferably, it is 87.2 to 89.5 degrees. If the taper angle of the abrasive 12 is within the above range, the glass powder or the ceramic powder, which is formed when grinding the glass material or the ceramic material and drilling holes, is smooth from the upper surface 12a side of the abrasive body 12. Then, it is discharged out of the processed hole. Therefore, the glass powder or the ceramic powder is not caught between the side surface of the abrasive grain body 12 and the inner surface of the processed hole of the glass material or the ceramic material, and the inner surface of the processed hole is not deeply scratched,
The inner surface of the processed hole can be uniformly and smoothly ground.
If the taper angle of the abrasive 12 is less than 84.3 degrees, the inner surface of the processed hole cannot be ground smoothly. If the taper angle of the abrasive 12 exceeds 89.9 degrees, it becomes difficult for glass powder or ceramic powder to be smoothly discharged out of the processed hole, resulting in deep scratches on the inner surface of the processed hole.

The base 11 is made of iron, stainless steel or the like. The abrasive grains 12 are integrally formed by fixing abrasive grains such as diamond and CBN to the base 11 by metal bonding.

Next, the hole drilling method of the present invention will be described with reference to FIG. According to the hole drilling method of the present invention, a glass material or a ceramic material, which is a workpiece, is fixed to a honing machine (not shown), and the grinding wheel 10 is set on the honing machine.
While the grinding wheel 10 is being rotated, the grinding wheel 10 is pushed into the workpiece and moved in the vertical direction with respect to the workpiece, so that a predetermined hole is drilled. At this time, the rotation speed of the grinding wheel 10 is preferably set to 500 to 5000 rpm. If the rotation speed is less than 500 rpm, the inner surface of the processed hole formed in the glass material or the ceramic material cannot be polished smoothly. If the rotation speed exceeds 5000 rpm, the inner surface of the processed hole is likely to be scratched. Further, the processing speed of the grinding wheel 10 is 1.0 mm / min to 50 mm / m.
It is preferably in. Processing speed is 1.0 mm / m
If it is less than in, the inner surface of the processed hole cannot be uniformly and smoothly polished, and the processing speed is slow, which is not suitable for productivity. If the machining speed exceeds 50 mm / min, the inner surface of the machined hole cannot be polished uniformly and smoothly, and the inner surface of the machined hole is easily scratched.

According to the hole machining method of the present invention, the standard deviation of the center line average roughness Ra of the inner surface of the machined hole can be 5 μm or less. Further, the inner surface of the machined hole can be uniformly and smoothly ground without making deep scratches on the inner surface of the machined hole.

Further, in the hole boring method of the present invention, as a pretreatment for boring a glass material or a ceramic material using the grinding wheel 10, the grinding wheel 10 is inserted into the glass material or the ceramic material. A pilot hole may be formed.

Hereinafter, the effects of the present invention will be clarified by showing concrete examples. First, a cylindrical glass material made of pure quartz was prepared. Next, this glass material was fixed to a honing machine. Next, a grinding wheel with a taper angle of 85 degrees was set on the honing machine, and while the grinding wheel 10 was rotating at a rotation speed of 2000 rpm, the glass material was vertically pushed at a speed of 20 mm / min to form a predetermined hole. Was done. Such a series of hole processing was performed on 100 glass materials. As a result, the standard deviation of the center line average roughness Ra of the inner surface of the processed hole was 5 μm, which was 20 μm when processed by the conventional grinding wheel. Further, no large scratch was generated on the inner surface of the processed hole.

[0014]

As described above, the grinding wheel of the present invention is a grinding wheel provided with a substrate and an abrasive grain, and since the abrasive grain is tapered, it has a hole of glass or ceramics. It can be processed uniformly and smoothly without damaging the inner surface. The taper angle of the abrasive grains is 84.3 to 8
If it is 9.9 degrees, the glass powder or the ceramic powder, which is produced when the glass material or the ceramic material is ground and the hole is processed, is smoothly discharged from the upper surface side of the abrasive grain to the outside of the hole. . Therefore, glass powder and ceramic powder
It is sandwiched between the side surface of the abrasive grain and the inner surface of the hole of the glass material or the ceramic material, and the inner surface of the hole can be ground uniformly and smoothly without making deep scratches on the inner surface of the hole.

Further, according to the hole drilling method of the present invention, a predetermined hole is drilled by pushing the grinding grindstone into the work material and moving it in a direction perpendicular to the work material while rotating the grinding wheel. The inner surface of the machined hole can be uniformly and smoothly ground without making deep scratches on the inner surface of the machined hole. The reciprocating speed of the grinding wheel is 1.0 mm /
If it is set to min to 50 mm / min, the inner surface of the processed hole can be made uniform and smooth.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a grinding wheel of the present invention.

FIG. 2 is a front view showing a conventional grinding wheel.

[Explanation of symbols]

10 ... Grinding wheel, 11 ... Base, 12 ... Abrasive body

Continued front page    (72) Inventor Kuniharu Himeno             Fuji Co., Ltd. 1440 Rokuzaki, Sakura City, Chiba Prefecture             Kura Sakura Office F term (reference) 3C063 AA02 AB02 BA02 BA21 BB02                       BC02 EE16 EE21 FF23 FF30                 4G015 FA09 FC00

Claims (5)

[Claims] 1. A grinding wheel provided with a base and an abrasive grain, wherein the abrasive grain has a tapered shape. 2. The taper angle of the abrasive grains is 84.3-8.
The grinding wheel according to claim 1, which is 9.9 degrees. 3. A predetermined hole is drilled by rotating the grinding wheel according to claim 1 or 2 and pushing it into a workpiece and moving it in a direction perpendicular to the workpiece. Hole drilling method. 4. The rotation speed of the grinding wheel is 500 to 50.
The hole drilling method according to claim 3, wherein the speed is set to 00 rpm. 5. The reciprocating speed of the grinding wheel is 1.0
mm / min-50 mm / min, The hole drilling method of Claim 3 or 4 characterized by the above-mentioned.