JPH05345279A - Manufacture of grinding wheel for grinding and polishing - Google Patents

Abstract

PURPOSE:To provide a grinding wheel for grinding and polishing capable of reducing plugging on the surface of the grinding wheel due to chips ground and polished off and grinding and polishing well. CONSTITUTION:In manufacturing a grinding wheel for grinding and polishing containing particulates soluble in a grinding and polishing liquid, the soluble particulates selected for the purpose of grinding and polishing are dissolved in a solvent. In this solution, abrasive grains selected for the purpose of grinding and polishing are scattered, mixed and stirred. Mixture of the abrasive grains and the solution of the soluble particulates is dried and made into powder. The powder provided through the above process is stabilized with a bonding agent. Arrangement of the soluble particulates inside of the grinding stone is limited in the neighborhood of the abrasive grains and chip pockets made due to elusion of the soluble particulates at the time of processing are arranged in the neighborhood of the abrasive grains.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to optical parts, mechanical parts,
The present invention also relates to a method for manufacturing a grindstone for grinding and polishing, which is suitable for grinding and polishing of parts made of ceramics, metals and the like.

[0002]

2. Description of the Related Art Conventionally, a manufacturing method of a grindstone for grinding and polishing includes:
For example, a method disclosed in JP-A-53-63692 is known. The method is a method for producing a grindstone for grinding and polishing containing therein particles (sodium chloride, potassium chloride, calcium chloride, sodium carbonate, sodium bromide, potassium bromide, etc.) soluble in a grinding and polishing liquid. The process is shown in. In this method, first, the required amount of soluble particles is prepared, and the required amount is added to the thermosetting resin to form a binder. Then, the abrasive grains are mixed with this bonding material so as to have a desired degree of concentration. Then, the mixed substance is fired at a predetermined temperature and pressure to manufacture a grindstone for grinding and polishing.

[0003]

According to the above-mentioned conventional manufacturing method, since the binder is a thermosetting resin in which the soluble particles are dispersed, most of the soluble particles in the formed body are obtained. It exists in the state of being surrounded by the resin, and some of them are in contact with the abrasive grains.
The effect of the soluble particles is that the chip pockets generated on the grindstone processing surface due to the dissolution of the soluble particles into the grinding / polishing liquid mainly serve as an escape site for grinding / polishing debris. When these chip pockets are generated in the vicinity of the abrasive grains that are the source of grinding and polishing chips, they exert the maximum effect as an escape area for grinding and polishing chips.

However, in the conventional grinding wheel,
Since the soluble particles are almost surrounded by the resin,
The escape area of grinding and polishing dust generated by the elution does not always exist near the abrasive grains. The chip pocket, which is generated when the soluble particles surrounded by the resin are eluted, has a smaller effect as an escape area for grinding and polishing chips than the chip pocket generated in the vicinity of the abrasive grains. Further, when there are no soluble particles in the vicinity of the abrasive grains and no chip pockets in the vicinity of the abrasive grains, there is a possibility that clogging may occur in the vicinity of the abrasive grains, which is a source of grinding and polishing dust.

The present invention has been made in view of the above conventional problems. By limiting the disposition of the soluble particles to the periphery of the abrasive grains, the chip pocket when the soluble particles are eluted is disposed in the vicinity of the abrasive grains. Thus, it is an object of the present invention to provide a method for manufacturing a grinding stone for grinding and polishing, which can reduce the occurrence of clogging and can obtain a sharp grinding stone.

[0006]

In order to achieve the above object, a method for producing a grinding stone for grinding and polishing according to the present invention comprises a step of dissolving soluble particles soluble in a grinding and polishing solution in a solvent to prepare a solution. Abrasive grains for grinding and polishing were mixed to form a mixture, the mixture was dried to form powder, and the powder was fixed with a binder to obtain a grindstone for grinding and polishing.

That is, according to the present invention, as shown in FIG.
In the manufacturing method of the grinding and polishing wheel containing particles soluble in the grinding and polishing liquid in the grinding and polishing wheel, the soluble particles selected according to the purpose of the grinding and polishing are dissolved in a solvent, according to the purpose of the grinding and polishing. A step of dispersing and mixing the selected abrasive grains, a step of drying the mixture of the abrasive grains and a solution of soluble particles into a powder, and a step of fixing the powder obtained by the above step with a binder. It has and.

[0008]

According to the above-mentioned production method of the present invention, by dipping the abrasive particles in the solution of the soluble particles and making it into a dry powder, the particles having the surface of the abrasive particles or the porous particles crystallize the soluble particles even inside the grindstone. Therefore, the soluble particles are arranged in a limited portion of the abrasive grain surface layer. As a result, the disposition of the soluble particles inside the grindstone when formed into a compact is limited to the vicinity of the abrasive grains, and the chip pockets due to the elution of the soluble particles are disposed near the abrasive grains during processing.

[0009]

[Embodiment 1] FIG. 2 shows a manufacturing process diagram of a method for manufacturing a grindstone for grinding and polishing according to this embodiment. In this embodiment, in order to generate a chip pocket for the purpose of reducing the grinding resistance,
A method of manufacturing a grindstone for grinding and polishing in which a water-soluble substance is placed in the grindstone will be described.

First, sodium chloride particles selected as a water-soluble substance for forming a chip pocket were dissolved in 100 cc of water at 60 ° C. as a solvent so as to be saturated. Next, add # 800 synthetic diamond grains 2 to this solution.
0 g was immersed and stirred. After the liquid temperature was lowered to 40 ° C., it was filtered to collect the synthetic diamond abrasive grains. Then, the abrasive grains are mixed with polyimide resin powder so that the concentration is 75, and the temperature is 500 ° C., 0.5 kg / cm ² , and 20 min.
It was molded into pellets under the firing conditions of. In this example, the pellets were processed into a desired grindstone shape and used as a grinding grindstone for grinding glass.

According to the manufacturing method of the present embodiment, the synthetic diamond particles are dispersed in the saturated aqueous solution of sodium chloride, and then the liquid temperature is lowered to cause crystallization of sodium chloride with the synthetic diamond particles as nuclei. In the filtered state, as shown in FIG. 3, sodium chloride grains 2 are attached around the synthetic diamond grains 1. FIG. 4 shows a cross-sectional view of the synthetic diamond abrasive grain 3 molded using a polyimide resin 4 serving as a binder. This grindstone forms a clearance 5 for grinding and polishing chips by elution of sodium chloride, which is a water-soluble particle, into the grinding and polishing liquid during processing. Since the escape area 5 for the grinding and polishing dust is in the vicinity of the synthetic diamond abrasive grain 3, it is particularly effective for clogging of the periphery of the synthetic diamond abrasive grain 3 by the grinding and polishing dust. Further, in order to investigate the influence of the manufacturing method on the processing performance of the grindstone, by using the grindstone manufactured in this example and the grindstone manufactured by dispersing water-soluble particles in the binder as in the conventional method. When the optical glass BK-7 was processed under the same conditions and the grinding allowance was measured, the grinding allowance of about 112% was obtained with the grindstone manufactured in this example as compared with the conventional grindstone.

That is, in this embodiment, it was possible to provide a grinding stone for grinding and polishing which has a great effect of the chip pocket generated by the soluble particles and has a good sharpness.

Although sodium chloride is used as the soluble particles in the present embodiment, particles of calcium chloride, sodium carbonate, potassium chloride, sodium bromide, potassium bromide or the like may be used.

[0014]

[Embodiment 2] FIG. 5 shows a manufacturing process diagram of a method for manufacturing a grindstone for grinding and polishing according to this embodiment. In this example, a method of manufacturing a grinding and polishing grindstone in which a water-soluble substance is placed in the grindstone for the purpose of improving the chemical grinding ability and forming chip pockets will be described.

First, the second nitric acid selected as the water-soluble substance
The cerium oxide abrasive was immersed in a saturated aqueous solution of cerium ammonium. Next, vacuum degassing was performed with a vacuum suction device while stirring the above mixture. Liquid temperature from 60 ℃ to 40 ℃
And then filtered to collect the synthetic diamond abrasive. The degree of concentration of these abrasive particles on the polyimide resin powder is 200
Mix so that it becomes 500 ℃, 0.5kg / cm ² , 20mi
It was molded into pellets under a firing condition of n 2. In this example, the pellets were processed into a desired grindstone shape and used as a grindstone for polishing glass.

According to the manufacturing method of the present embodiment, by adhering the soluble particles to the periphery of the abrasive grains in the same manner as in the first embodiment, it is possible to form a chip pocket effective as an escape place for grinding and polishing dust, and the soluble particles. The chemical action can be obtained by elution of the ceric ammonium nitrate, which is the same as the above, and by performing vacuum defoaming at the same time when dispersing and mixing and stirring, an aggregate of fine powder forms particles like a cerium oxide abrasive. In the case of forming particles and those having porous cracks in the particles, soluble particles can be attached even to a slight gap, and even if there are aggregates of particles, etc. Has the advantage of being attached.

In the present embodiment, the soluble particles are converted into the second nitric acid.
Although cerium ammonium was used, cerium hydroxide and other soluble substances depending on the workpiece may be used. Further, in the above-mentioned Examples 1 and 2, synthetic diamond is used as the abrasive grains,
Although the cerium oxide and the polyimide resin are used as the binder, the same effect can be obtained by using abrasive grains such as zirconium oxide, c-BN and red iron oxide, and a thermosetting resin such as phenol type and polyamide imide type. Further, in addition to the method described in the examples, the method of fixing the abrasive particles to which the soluble particles are adhered with the binder is coated with the resin so that the abrasive having the water-soluble particles arranged around it is provided with a desired concentration. After that, it is molded and fired, or the binder is weighed to achieve the desired concentration, dissolved in a solvent, and then water-soluble particles are placed around and the abrasive is mixed and dispersed in the solution and poured into the mold. However, known methods such as a method of drying and baking are also possible.

[0018]

As described above, according to the manufacturing method of the present invention, it is possible to reduce the clogging of the surface of the grindstone due to the grinding and polishing dust, and it is possible to manufacture the grindstone for grinding and polishing having excellent sharpness.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram showing the concept of the present invention.

FIG. 2 is a manufacturing process diagram showing the first embodiment of the present invention.

FIG. 3 is a sectional view showing a synthetic diamond abrasive grain 3 in Example 1.

FIG. 4 is a cross-sectional view of the grindstone obtained in Example 1.

FIG. 5 is a manufacturing process diagram showing a second embodiment of the present invention.

FIG. 6 is a manufacturing process diagram showing a conventional example.

[Explanation of symbols]

 1 synthetic diamond grain 2 sodium chloride grain 3 synthetic diamond abrasive grain 4 polyimide resin 5 escape area

Claims (1)

[Claims] 1. A solution in which soluble particles soluble in a grinding and polishing liquid are dissolved in a solvent to prepare a solution, and abrasive grains for grinding and polishing are mixed into the solution to form a mixture, and the mixture is dried to form a powder. A method of manufacturing a grindstone for grinding and polishing, which comprises fixing a body with a binder to obtain a grindstone for grinding and polishing.