JP2002052472A - Self-lubricating grinding wheel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-lubricating grinding wheel superior in cutting performance in dry grinding, preventive of the rough machined surface of a material to be ground and of discoloration during grinding, and excellent in machining accuracy, and its manufacture. SOLUTION: The self-lubricating grinding wheel comprises carbon particulates deposited in fine cavities in the grinding wheel. The grinding wheel is immersed in an organic solvent and the fine cavities in the grinding wheel are impregnated with the organic solvent and dried. Then, organic matters in the fine cavities in the grinding wheel are dried and carbonized in a inactive atmosphere, whereby carbon particulates are deposited in the fine cavities in the grinding wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a self-lubricating grindstone and a method for producing the same.

[0002]

2. Description of the Related Art Generally, wet grinding, in which a grinding surface is wetted with a grinding fluid, is mainly used for grinding using a grinding wheel, particularly for precision grinding and cutting, in order to impart a lubricating effect, a cooling effect and a cleaning effect to the ground surface. It has been done. As a result, the life of the cutting edge of the grinding wheel can be prolonged, and not only can the chip be easily discharged, but also the surface roughness of the workpiece, grinding burn,
This solves the problem of processing accuracy.

However, depending on the material to be ground, it was necessary to perform dry grinding instead of wet grinding. In this case, since the lubricating property at the contact portion between the grinding wheel and the workpiece is insufficient, not only does the sharpness drop during grinding,
Unnecessary grinding resistance is increased, so that the grinding temperature is increased, the machining accuracy is degraded, the finished surface roughness of the material to be ground is deteriorated, and uncut portions and cracks occur.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of such problems of the related art,
An object of the present invention is to provide a self-lubricating grindstone excellent in sharpness in dry grinding, excellent in surface roughness of a material to be ground, prevention of grinding burn and processing accuracy, and a method of manufacturing the same.

[0005]

That is, according to the present invention, there is provided a self-lubricating grindstone characterized by depositing fine carbon particles in fine voids of a grinding grindstone. At this time, in the present invention, it is preferable that the grinding wheel is a vitrified wheel. Further, in the present invention, the pore diameter of the vitrified grindstone is preferably 10 to 800 μm, and the porosity of the vitrified grindstone is preferably 30 to 45% by volume.

Further, according to the present invention, there is provided a method of manufacturing a self-lubricating whetstone in which carbon fine particles are deposited in fine voids of a grinding whetstone, wherein the grinding whetstone is immersed in an organic solution, After impregnated with organic solution and dried,
Under an inert atmosphere, a method for producing a self-lubricating grindstone is provided, wherein carbon fine particles are deposited in the minute gaps of the grinding wheel by dry-distilling and carbonizing organic substances in the minute gaps of the grinding wheel. Is done.

At this time, in the present invention, the solute of the organic solution is preferably a saccharide such as a monosaccharide or a disaccharide, and more preferably sucrose. In the present invention, the solvent of the organic solution is preferably water.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The self-lubricating whetstone of the present invention is obtained by depositing carbon fine particles in fine voids of a grinding whetstone. That is, the self-lubricating grindstone of the present invention has abrasive grains, a binder,
By depositing carbon fine particles (graphite) in the voids of the grinding wheel composed of voids (pores), even during dry grinding, the carbon fine particles are removed from the voids of the grinding abrasives and the grinding wheel and the material to be ground. The lubrication between the grinding wheel and the material to be ground can be improved because it is constantly supplied to the contact portion with the grinding wheel.

Further, in the self-lubricating grindstone of the present invention, since the void portion of the grinding wheel is deposited with fine carbon particles, chips generated during cutting do not enter the void portion and do not clog. .

From the above, the self-lubricating grindstone of the present invention has excellent sharpness in dry grinding, and is excellent in surface roughness of a material to be ground, prevention of grinding burn, and processing accuracy. still,
The shape of the self-lubricating grindstone of the present invention is not particularly limited, and is a rough ore, a disk shape cut into a final shape, a round bar shape,
Any of strip shape may be used.

The grinding wheel used in the present invention is not particularly limited, and can be applied to all natural grinding wheels and artificial wheels. In particular, it is a vitrified grinding wheel rich in fine pores. Is preferred. At this time, the pore diameter of the vitrified grindstone is preferably 10 to 800 μm, and the porosity of the vitrified grindstone is preferably 30 to 45% by volume. In addition, the vitrified whetstone is
Abrasive grains such as fused alumina and silicon carbide are melt-bonded with a compound such as feldspar or clay.

Next, a method for producing the self-lubricating grindstone of the present invention will be described. First, the grinding wheel from which the moisture in the fine gap is removed in advance by depressurization or drying is immersed in an organic solution, and while rocking the grinding wheel, the organic solution is impregnated in the fine gap of the grinding wheel, and then dried. I let it. Then, the grindstone impregnated with the solute of the organic solution in the fine voids is mixed with an organic substance in the fine voids of the grinding grindstone under inert atmosphere for 200 minutes.
~ 400 ° C, dry distillation and carbonization for 3-6 hours. The self-lubricating grindstone of the present invention can be obtained through the carbon fine particle deposition step as described above. The inert atmosphere can be realized by using an inert gas such as a nitrogen gas or a carbon dioxide gas, or by making the grinding wheel airtight with an aluminum foil or the like.

Further, the self-lubricating grindstone of the present invention arbitrarily adjusts the amount of carbon fine particles in the fine voids of the grinding grindstone by the number of carbon atoms and the dissolved concentration of the solute in the organic solution, and the number of carbon fine particle deposition steps. be able to.

The solute of the organic solution used in the present invention is:
It is preferable that the organic material is easily soluble in a solvent, has a low solution viscosity, and has a large number of carbon atoms. Typical organic substances include, for example, monosaccharides and disaccharides. Among them, sucrose is particularly preferable because of its high solubility in water and high permeability to the fine voids of the grinding wheel.

As the solvent of the organic solution used in the present invention, mineral oil, alcohol, esters, and the like can be appropriately used depending on the type of the solute. When the solute is a saccharide, it is preferably water. .

[0016]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. (Examples 1 and 2) Count: 800 #, Size: 2 × 10 ×
A 100 mm vitrified grindstone (manufactured by Cleinton) [base material] was pre-dried at 50 ° C. for 2 hours. Then, the predried vitrified grindstone is put into an impregnation tank (capacity: 2000 ml) and immersed in an aqueous sucrose solution. Then, while rocking the vitrified grindstone, the aqueous sucrose solution is placed in the fine voids at room temperature for 4 hours. Impregnated.

Finally, the surface of the vitrified grindstone impregnated with the aqueous sucrose solution was dried and wiped off, then airtightly wrapped with aluminum foil, and carbonized at 300 ° C. for 3 hours. Through the steps as described above, self-lubricating whetstones having different carbon fine particle contents were produced respectively (Examples 1 to 5).
2).

Next, using the self-lubricating grindstone (Examples 1 and 2) obtained as described above, dry grinding of steel (SK-3, manufactured by Daido Steel Co., Ltd.) as a typical work material was performed. . Table 1 shows the results.

The aqueous sucrose solution was prepared by adding 700 g of sugar manufactured by Nisshin Seiko to 300 ml of tap water,
After stirring and dissolving for a period of time, the supernatant solution was used as a stock solution.
Then, a solution twice as thin as the original solution was used.

(Comparative Examples 1-2) Next, the count: 800 #,
The wet grinding (Comparative Example 1) and the dry grinding (Comparative Example 2) of the SK-3 were performed using a vitrified grindstone of 2 × 10 × 100 mm (manufactured by Cleetton). Table 1 shows the results. When wet grinding (Comparative Example 1) was performed, Crecut # 50 (a 20-fold solution of ET50, manufactured by Cleetton Co., Ltd.) was used as a grinding fluid.

[0021]

[Table 1]

(Consideration: Examples 1 and 2, Comparative Examples 1 and 2) From the results shown in Table 1, Examples 1 and 2 are compared with Comparative Example 1.
There was no streak on the ground surface of the work material, and dry grinding was possible while maintaining good finished surface roughness. Further, in Examples 1 and 2, since the grinding was performed by dry grinding, there was no need to use a grinding fluid as in Comparative Example 2, and the working environment was good. Further, as in Example 2, it has been found that by adjusting the content of the carbon fine particles, it is possible to optimize the sense of contact with the work material.

[0023]

As described above, according to the present invention,
A self-lubricating grindstone excellent in sharpness in dry grinding, excellent in surface roughness of a material to be ground, prevention of grinding burn and processing accuracy, and a method for manufacturing the same can be provided.

Claims (8)

[Claims] 1. A self-lubricating grindstone characterized by depositing fine carbon particles in fine voids of a grinding grindstone. 2. The self-lubricating whetstone according to claim 1, wherein the grinding whetstone is a vitrified whetstone. 3. A vitrified grindstone having a pore diameter of 1
The self-lubricating whetstone according to claim 1, wherein the whetstone has a thickness of 0 to 800 μm. 4. The porosity of a vitrified whetstone is 3
The self-lubricating whetstone according to any one of claims 1 to 3, which is 0 to 45% by volume. 5. A method for producing a self-lubricating whetstone in which carbon fine particles are deposited in fine voids of a grinding wheel, wherein the grinding wheel is immersed in an organic solution, and an organic solution is impregnated in the fine voids of the grinding wheel. Self-lubricating characterized by depositing carbon fine particles in the fine voids of the grinding wheel by drying and carbonizing the organic matter in the fine voids of the grinding wheel under an inert atmosphere after drying. Manufacturing method of whetstone. 6. The method according to claim 5, wherein the solute of the organic solution is a saccharide such as a monosaccharide or a disaccharide. 7. The method for producing a self-lubricating whetstone according to claim 6, wherein the solute of the organic solution is sucrose. 8. The organic solvent according to claim 5, wherein the solvent is water.
8. The method for producing a self-lubricating grindstone according to any one of items 7 to 7.