JPH05305572A - Abrasive grinding wheel - Google Patents

Abstract

PURPOSE:To minimize abrasive resistance by mixing diamond superfine powder having a grain size less than a specified number to a binder as a lubricating material. CONSTITUTION:To a binder 1 consisting of resin or metal, diamond superfine powder 2 having a grain size less than 100Angstrom is mixed as a lubricating material to provide a desired abrasive grinding wheel. The diamond superfine powder 2 has extremely high abrasive resistance, and shows a high rigidity and high lubricating performance when rolled on the critical surface between a material to be polished and the grinding wheel. Thus, a low abrasive resistance is realized, and also an improvement in lubricating performance by the life improvement of the lubricating material is realized. Further, by using the diamond superfine powder 1 less than 100Angstrom , an optical abrasive surface is provided without flawing the surface to be worked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone for polishing hard and brittle materials such as glass.

[0002]

2. Description of the Related Art Conventionally, as a grinding / polishing grindstone for hard and brittle materials, one disclosed in Japanese Patent Publication No. 53-8950 is known. As shown in FIG. 6, this grindstone has a binder 11 which is made by adding 2 to 15% by weight of tungsten disulfide 10 to a resin or a metal serving as a base material of the grindstone binder.
The abrasive grains 12 are diamond or cubic boron nitride. And, in this grindstone, in the grinding process of hard and brittle material, the grinding resistance is small due to the wear resistance and lubricity of the tungsten disulfide arranged in the binder, and it has excellent wear resistance. There is. Note that molybdenum disulfide, graphite, and the like are known as lubricants added to the binder for the same purpose as above.

[0003]

However, in the above-mentioned conventional grindstone, although tungsten disulfide, molybdenum disulfide, etc. are used as the lubricant, these are all low in hardness (molybdenum disulfide <tungsten disulfide). : Mohs hardness is 1 to 1.5), and abrasion is likely to occur when processing a hard and brittle material such as glass, and the effect as a lubricant cannot be maintained for a long time. Further, there is a risk that the lubrication effect will be reduced due to friction during processing and the lubrication effect will be reduced, and clogging due to the attachment of polishing debris may occur, resulting in a decrease in the surface accuracy of the work surface due to an increase in polishing resistance. There was a problem. SUMMARY OF THE INVENTION It is an object of the present invention to provide a polishing grindstone that solves the above-mentioned problems of the prior art and can prevent a decrease in surface accuracy due to polishing resistance.

[0004]

In order to achieve the above object, the polishing grindstone of the present invention, as shown in FIG. 1, has a bonding material 1 made of resin or metal, and a diamond super-particle having a particle size of 100 Å or less. The fine powder 2 was mixed and used as a lubricant. The abrasive grains 3 of the polishing grindstone of the present invention include materials such as cerium oxide, alumina-based, silicon carbide-based, zirconium oxide, and the like, and the binder 1 is polyimide-based, phenol-based, polyamide-based. , ABS-based resins, metals such as tin, copper, nickel, and alloys thereof.

[0005]

According to the polishing grindstone having the above structure, the ultrafine diamond powder has a very high abrasion resistance and exhibits high rigidity during rolling at the interface between the object to be ground and the grindstone, thus exhibiting high lubricating performance. A low polishing resistance is realized, and at the same time, the lubrication ability is improved by improving the life of the lubricant. Furthermore, by using ultrafine diamond powder of 100 Å or less, it is possible to obtain an optically polished surface without scratching the surface to be processed, and because the hardness is higher than that of conventional lubricants, the grindstone after detachment from the binder A dressing effect on the surface is also obtained.

[0006]

[Embodiment 1] FIG. 2 is an enlarged cross-sectional view showing Embodiment 1 of a grinding stone for polishing according to the present invention. When the polishing grindstone is formed, the cerium oxide abrasive grains 3 are weighed so that the specific gravity is 55% by weight, the abrasive grain binder 1 is 40% by weight, and the ultrafine diamond powder 2 is 5% by weight. Here, a polyimide resin is used for the abrasive grain binding material 1, and the diamond ultrafine powder 2 has a particle diameter of 100.
Å Use the following. Then, the abrasive grain binding material 1 is dissolved in a pyrrolidone-based organic solvent and mixed with the ultrafine diamond powder 2 by stirring, and this solution is dried in a drying furnace at 70 ° C. for 48 hours and pulverized. The pulverized material and the abrasive grains 3 were sufficiently mixed, compression-molded, and then fired at 100 ° C. to produce a polishing grindstone.

The samples of the optical glass BK-7 (φ30) were respectively subjected to the number of rotations of the grinding wheel by the grinding wheel of the present example and the conventional grinding wheel similarly manufactured by using tungsten disulfide as a lubricant. The results when polishing is performed at 1000 rpm are shown. FIG. 3 is an interference fringe diagram of a surface to be processed by the polishing grindstone of the present embodiment, and FIG. 4 is an interference fringe diagram of a conventional polishing grindstone using tungsten disulfide. The surface to be processed of the sample is shown. Immediately after lapping the grindstone, both could be machined with the same surface accuracy, but at the 50th piece, there was a difference in the accuracy of the surface to be machined as shown in FIGS. 3 and 4. This is because, in the conventional grinding wheel using tungsten disulfide, the polishing resistance increases due to the above-mentioned reason, and vibration occurs during processing, which deteriorates the surface accuracy. Further, in comparison of the polishing allowance, the polishing grindstone of this example has a ratio of 1.2 to 1.3 times that of the conventional polishing grindstone, and since the grinding ratio is the same, high polishing property is obtained. You can see that it has been obtained. That is, in the polishing grindstone of the present embodiment, the ultrafine diamond powder 2 mixed with the binder 1 has a large lubricating effect and a large hardness, so that the polishing grindstone has a sharpening function. Therefore, it is considered that the polishing property is improved.

In this embodiment, the case was explained in which the diamond superfine powder 2 was mixed with the binder 1 in an amount of 5% by weight to produce a polishing grindstone.
It can be carried out by mixing within a range of 0.1 to 20% by weight, and within this range, an effect of low polishing resistance is obtained. When the amount of the ultrafine diamond powder 2 added was less than 0.1% by weight, the effect of low polishing resistance was not obtained so much, and when it was more than 20% by weight, the polishing property was deteriorated. The particle size of the ultrafine diamond powder 2 is 1
Although it is set to 00 Å or less, this means that when a particle having a maximum particle size of more than 100 Å is used, the diamond powder causes scratches on the surface to be processed, and the optically polished surface cannot be stably obtained. This is because.

[0009]

[Embodiment 2] FIG. 5 is an enlarged cross-sectional view showing Embodiment 2 of a grinding wheel for polishing according to the present invention. The polishing wheel of this embodiment is
The surface of the ultrafine diamond powder 2 is coated with a solvent-resistant water repellent 4 (silicone-based, fluorine-based water repellent, or a substance that reduces adhesiveness to a substance used as a binder).
It was manufactured by mixing in the binder 1. This accelerates the detachment of the ultrafine diamond powder 2 from the binder 1 and facilitates the presence of the ultrafine diamond powder 2 in the free state at the interface between the work piece and the polishing grindstone, thereby providing a lubricating action and a dressing action. Decided to improve. When manufacturing the polishing grindstone of the present embodiment, as a pre-process of melting and melting the binder 1 and mixing the diamond ultrafine powder 2 in the manufacturing process of the polishing grindstone of Example 1 above, The surface is coated with the water repellent 4. The subsequent manufacturing process is the same as that of the first embodiment.

According to this embodiment, the ultrafine diamond powder 2 is used.
Is coated with the water repellent 4 and mixed with the binder 1,
The wettability between the ultrafine diamond powder 2 and the binder 1 is reduced,
The force for holding the ultrafine diamond powder 2 is reduced. As a result, the ultrafine diamond powder 2 is easily separated from the binder 1 during polishing, and a lubricating action and a dressing action are likely to occur at the processing interface.

In this embodiment, since the ultrafine diamond powder 2 treated with the water repellent agent is used, the grinding ratio tends to decrease due to the easy removal of the ultrafine diamond powder 2, but with the water repellent agent 4. The coated ultrafine diamond powder 2 and the uncoated ultrafine diamond powder 2 are mixed at a desired ratio according to the work piece and mixed with the binder 1 to suppress a decrease in the grinding ratio and to provide a lubricating action. , It can have a sharpening effect. Further, when the diamond ultrafine powder 2 is excessively released due to the work piece, a coupling agent such as silane-based or titanium-based is used in place of the water repellent 4, so that the binder 1 and the diamond ultrafine powder 2 are separated from each other. It is possible to improve the wettability and to increase the force for holding the ultrafine diamond powder 2.

In the first and second embodiments, the case where cerium oxide is used as the abrasive grains 3 has been exemplified, but alumina type, silicon carbide type, zirconium oxide type or the like may be used. In addition, although the case where a polyimide resin is used as the binder 1 is illustrated, a resin such as a phenol resin, a polyamide resin, or an ABS resin, or a metal such as tin, copper, or nickel unless scratches are formed on the workpiece. And its alloys may be used.

[0013]

As described above, according to the present invention, since ultrafine diamond powder is mixed as the lubricant into the binder, the polishing resistance is reduced and the lubricating ability is improved by the life of the lubricant being improved. Further, since the ultrafine diamond particles have a particle size of 100 Å or less, they can be processed without causing scratches on the surface to be processed, and since the hardness is large, the dressing effect after separation is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a polishing grindstone of the present invention.

FIG. 2 is an enlarged sectional view showing a polishing grindstone of Example 1 of the present invention.

FIG. 3 is an interference fringe diagram of a surface to be processed which is processed by a polishing grindstone according to an embodiment of the present invention.

FIG. 4 is an interference fringe diagram of a processed surface processed by a conventional polishing grindstone.

FIG. 5 is an enlarged sectional view showing a polishing grindstone according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a conventional polishing grindstone.

[Explanation of symbols]

 1 Binder 2 Diamond Ultrafine Powder 3 Abrasive Grains

Claims (1)

[Claims] 1. A polishing grindstone obtained by fixing an abrasive with a binder made of resin or metal, wherein the binder is mixed with ultrafine diamond powder having a particle size of 100 Å or less as a lubricant. A grindstone for polishing.