JP2002274944A - Raw material for grinder, resin wheel and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacturing a resin wheel or a raw material for a grinder containing amorphous carbon with high accuracy. SOLUTION: A super abrasive 2' is dispersed in a liquid phase phenol resin 4 and calcined at the temperature as low as about 200 deg.C in a pressurized state. Then the material is fired at >=500 deg.C in a nonoxidative atmosphere to form an abrasive layer containing amorphous carbon converted from the phenol resin. The abrasive layer 10 is pulverized to obtain amorphous carbon particles 6 containing the pulverized irregular super abrasive 2'. The particles 6 are added together with the main super abrasive 2 to a phenol resin 6C and fired at the temperature as low as about 200 deg.C to obtain a resin wheel 1 in a thin plate ring state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin wheel used for, for example, cutting various kinds of work materials, a method of manufacturing the same, and a raw material for a grinding wheel of the resin wheel.

[0002]

2. Description of the Related Art A resin bond grindstone is prepared by mixing a raw material powder of a thermosetting resin such as an epoxy resin or a phenol resin with superabrasive grains such as diamond or CBN, and singly or as required. And press-molding and firing to form a resin-bonded abrasive layer. Resin-bonded grinding stones are used to grind relatively hard workpieces because the resin binder phase that holds the superabrasive particles is relatively soft and brittle. The binder phase breaks or wears out and falls off. Therefore, resin-bonded grindstones have the drawback of severe wear, but are less likely to cause sharpness reduction compared to metal-bonded grindstones and can be ground efficiently, and the resin bonding phase has an elastic effect, so the work material is less damaged . For this reason, for example, by using it as a resin wheel for a cutter having a thin ring shape, high-precision cutting can be performed. Further, in a conventional resin-bonded grindstone, there is a resin-bonded grindstone in which a solid lubricant such as hBN or graphite is dispersed as a filler in a resin binder phase in order to suppress frictional heat generated by grinding and cutting resistance.

[0003]

However, in the above-described resin-bonded grindstone, the grinding and cutting resistance can be reduced by the solid lubricant dispersed and disposed as a filler in the resin-bonded phase, but the resin-bonded phase itself is easily embrittled and the grinding force is reduced. In view of such a problem, the present invention, in view of such a problem, has a problem in that the effect of improving the wear resistance of the grain layer is poor, and in view of such a problem, it is possible to reduce the grinding resistance and improve the wear resistance. And a method for producing the same. Another object of the present invention is to provide a raw material for a grinding wheel such as a resin-bonded grinding wheel capable of reducing the grinding resistance and improving the wear resistance.

[0004]

The raw material for a grindstone according to the present invention is prepared by dispersing superabrasive grains in a phenolic resin, firing in a pressurized state, and then firing in a non-oxidizing atmosphere at 500 ° C. or higher. It is characterized in that phenol resin is made into amorphous carbon. In order to convert phenolic resin into amorphous carbon, it is necessary to first bake at a relatively low temperature of about 200 ° C and solidify it, and then heat it at a relatively high temperature of 500 ° C or higher. Therefore, thermal deformation occurs in the abrasive layer made of superabrasives and phenolic resin, so that it is not possible to accurately manufacture a thin resin bond wheel such as a resin wheel using amorphous carbon as a resin bonding phase. In this regard, according to the present invention, by using an abrasive layer in which a phenolic resin in which superabrasive particles are dispersed and converted into amorphous carbon in advance is used as a raw material for a grinding wheel, the subsequent firing for producing a resin bond grinding wheel is 150 to 45.
It can be performed at a relatively low temperature of about 0 ° C.

In the resin wheel according to the present invention, an abrasive grain layer in which superabrasive grains are dispersed and dispersed in an amorphous carbonized phenol resin is crushed, and the crushed pieces are added to a phenol resin or a polyimide resin and fired. It is characterized by becoming. By adding crushed pieces made of amorphous carbon or amorphous carbon including superabrasive grains to a phenolic resin or a polyimide resin (along with the main superabrasive grains) and firing them, firing is performed at a relatively low temperature of about 150 to 450 ° C. This makes it possible to manufacture thin resin wheels with high precision while suppressing thermal distortion. Moreover, the amorphous carbon is dispersed and arranged in a resin binder phase such as a phenolic resin or a polyimide resin and acts as a lubricant.
Further, since the hardness, the compressive strength, the bending strength, and the like are larger than those of a solid lubricant such as graphite, deformation and uneven wear of the grindstone can be effectively suppressed.

In the method for manufacturing a resin wheel according to the present invention, super-abrasive grains are dispersed in a phenol resin and fired in a pressurized state, and then fired in a non-oxidizing atmosphere at 500 ° C. or higher to make the phenol resin amorphous. It is characterized in that the abrasive layer which has been carbonized and which has been converted into amorphous carbon is pulverized, and the pulverized pieces are added to a phenol resin or a polyimide resin and fired. Abrasive layers made of super-abrasive grains and amorphous carbon are manufactured in advance, and crushed pieces of amorphous carbon containing the super-abrasive grains obtained by crushing this are added to phenolic resin or polyimide resin and fired to contain amorphous carbon. The firing temperature for manufacturing the resin wheel can be set to a relatively low temperature of about 150 to 450 ° C., and the heat distortion due to firing can be suppressed, and a thin resin wheel can be manufactured with high precision.

The raw material for a grinding wheel according to the present invention is obtained by mixing superabrasives with a liquefied phenol formaldehyde resin, removing the liquid used for the liquefaction, heating and calcining, and then heating at 500 ° C. or higher. Characterized in that the phenol formaldehyde resin is converted into amorphous carbon by firing in a non-oxidizing atmosphere. Since phenol formaldehyde resin cannot exhibit a liquid phase, it is liquefied by adding a liquid such as alcohol, mixed with superabrasives, and then the liquid is removed. Then, by heating at a relatively high temperature of 500 ° C. or more, the phenol formaldehyde resin can be converted to amorphous carbon, and at that time, by firing at a high temperature, thermal distortion occurs in the abrasive layer made of super-abrasive grains and the phenol formaldehyde resin. For this reason, it is impossible to accurately manufacture a thin resin bond grindstone such as a resin wheel using amorphous carbon as a resin binding phase. In that regard, according to the present invention, by using the abrasive layer in which the phenol formaldehyde resin in which the superabrasive particles are dispersed into amorphous carbon is used as a raw material for the grinding wheel, the subsequent amorphous carbon is contained in the resin binder phase as a lubricant. Firing for manufacturing resin bond whetstones such as resin wheels is 150
It can be performed at a relatively low temperature of about 450 ° C., and a resin bond grindstone such as a resin wheel can be manufactured with high accuracy.

The resin wheel according to the present invention crushes an abrasive grain layer in which superabrasive grains are dispersed and arranged in an amorphous carbonized phenol formaldehyde resin, adds the crushed pieces to a phenol resin or a polyimide resin, and fires the crushed pieces. It becomes. By adding amorphous carbon or crushed pieces containing superabrasives thereto (together with main superabrasives) to a phenolic resin or a polyimide resin and firing, the firing is reduced to one.
It can be performed at a relatively low temperature of about 50 to 450 ° C., and a thin resin wheel can be manufactured with high precision while suppressing thermal distortion. Moreover, the amorphous carbon is dispersed and arranged in a resin binder phase such as a phenol resin or a polyimide resin to act as a lubricant, thereby reducing the grinding and cutting resistance between the workpiece and the material to suppress the generation of grinding heat. Since the hardness, the compressive strength, the bending strength, and the like are larger than those of a solid lubricant such as graphite, the deformation and uneven wear of the grindstone can be effectively suppressed.

The method for producing a resin wheel according to the present invention comprises mixing a phenol formaldehyde resin in a liquefied state with superabrasive grains, removing the liquid used in the liquefaction, heating and calcining, and further heating at 500 ° C. or higher. Baking in a non-oxidizing atmosphere to form phenol formaldehyde resin into amorphous carbon, crushing the amorphous carbonized abrasive layer, and adding the crushed pieces to phenol resin or polyimide resin and baking. Features. Abrasive layers made of superabrasive grains and amorphous carbon are manufactured in advance, and crushed pieces of the amorphous carbon obtained by crushing the abrasive grains are added to a phenol resin or a polyimide resin and fired. Can be performed at a relatively low temperature of about 450 ° C.
A thin resin wheel can be manufactured with high precision while suppressing thermal distortion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a resin wheel according to the present invention will be described with reference to the accompanying drawings. FIG. 1A is a partial sectional view of a resin wheel according to an embodiment, FIG. 1B is an enlarged sectional view of amorphous carbon particles contained in the resin wheel shown in FIG. 1, and FIG. 2 is a partial sectional view of a resin wheel according to a modification. FIG. 3 (a),
(B), (c), (d) is a figure which shows the manufacturing process of a resin wheel. The resin wheel 1 according to the present embodiment shown in FIG. 1A is used for grinding and cutting a work material, for example, with a cutter formed in a thin plate shape having a thickness of several tens μm to several hundreds μm in a ring shape. is there. The resin wheel 1 has an abrasive layer 5 in which main superabrasive grains 2 such as diamond and cBN are dispersed and arranged in a resin binder phase 4, and the resin binder phase 4 is, for example, a thermosetting resin such as a phenol resin or a polyimide resin. A large number of amorphous carbon particles 6 of irregular shape are dispersed and arranged as fillers in a resin binder phase 4 which is made of a conductive resin. As shown in FIG. 1 (b), the amorphous carbon particles 6 are composed of one or more superabrasive grains 2 'dispersed in the amorphous carbon 7, but do not include the superabrasive grains. In addition, as other fillers in the resin binder phase 4, other than the amorphous carbon particles 6, Si may be used.
At least one or more of hard fillers, hollow glass, and the like among C, SiO ₂ , Ag, Cu, and Ni may be included.

The amorphous carbon particles 6 constitute a lubricant and are formed into irregularly shaped pulverized pieces. The particle size is not particularly limited, but is preferably 1% of the particle size of the main superabrasive particles 2.
/ 10 to 2 times. Here, when the particle diameter of the amorphous carbon particles 6 is less than 1/10 of the particle diameter of the main superabrasive particles 2, the effect of reducing grinding cutting resistance to suppress generation of grinding heat and the effect of improving wear resistance are obtained. Weak, main super abrasive 2
When the particle diameter exceeds twice the dispersion pitch of the amorphous carbon particles 6, the contact length between the work material and the resin binder phase 4 increases, resulting in an increase in grinding and cutting resistance. The amorphous carbon particles 6 may be crushed pieces by themselves or may be crushed pieces by being combined with the superabrasive grains 2 '.
FIG. 1A shows that the amorphous carbon particles 6 are composed of the abrasive layer 5.
1 shows a configuration of the resin wheel 1 having a particle size larger than or equal to that of the main superabrasive grains 2, that is, from 1 to 2 times the particle size of the main superabrasive grains 2. FIG. 2 shows amorphous carbon particles 6.
Shows the configuration of the resin wheel 1 in which the particle diameter is smaller than the main superabrasive grains 2 of the abrasive layer 5, that is, 1/10 to less than 1 times the particle diameter of the main superabrasive grains 2. In the case of the abrasive layer 5 of FIG. 2, the superabrasive grains 2 ′ have a smaller particle size than the main superabrasive grains 2. The structure of the amorphous carbon particles 6 included in each case is shown in FIG.
It is the same as that shown in FIG. The total amount of the amorphous carbon particles 6 is, for example, 5 to 60 vol% in volume ratio of the resin binder phase 4 excluding the main superabrasive particles 2 of the abrasive layer 5. here,
When the amount of the amorphous carbon particles 6 is less than 5 vol%, the effect of containing the amorphous carbon particles 6
For example, the effects of reducing grinding heat and improving wear resistance due to grinding cutting resistance are not sufficient. When the amount of the amorphous carbon particles 6 exceeds 60 vol%, the ratio of the resin binder phase 4 occupying in the abrasive layer 5 is reduced, and the strength of the abrasive layer 5 is greatly reduced. This causes a problem that the performance is reduced.

Further, the shore hardness Hs of the amorphous carbon particles 6 is set to Hs = 100 to 120. Here, if the shore hardness is less than 100, the hardness of the amorphous carbon particles 6 is small. In addition to the fact that deformation and uneven wear cannot be suppressed, the low lubricating property makes it difficult to reduce the grinding resistance between the workpiece and the workpiece, thereby preventing the generation of grinding heat. Further, the amorphous carbon particles 6 are formed by firing a phenol resin or a phenol formaldehyde resin at 500 ° C. to 3000 ° C. When fired at 500 ° C. or less, the Shore hardness Hs becomes less than 100, and the amorphous carbon particles 6 fired at a high temperature of 600 ° C. or more have high hardness and excellent lubricity, and are preferably fired at 700 ° C. or more. Thus, amorphous carbon particles 6 having a Shore hardness Hs of 100 to 120 can be obtained.

Next, the resin wheel 1 according to the embodiment will be described.
3 will be described with reference to FIG. As shown in FIG. 3A, the tank is filled with a liquid phase phenolic resin 7A,
The superabrasive grains 2 'are put into the liquid phase phenol resin 7A and dispersed. In this state, the phenol resin 7A is heated and baked while being pressurized at a relatively low temperature of, for example, about 200 ° C. to change the liquid phase to a solid phase.
The firing is performed in a relatively high temperature non-oxidizing atmosphere up to about 3000 ° C. As a result, the phenol resin 7A is converted into amorphous carbon, and as shown in FIG. 3 (b), a state of the abrasive layer 10 in which the superabrasive particles 2 'are dispersed and arranged in the amorphous carbon 7 in the solid phase. Since the abrasive layer 10 is fired at a high temperature, thermal distortion is generated, and the surface thereof has irregularities and the like and has low flatness. For example, a thin plate having a thickness of about 100 μm cannot be formed. Next, by grinding this abrasive grain layer 10, amorphous carbon grains 6 of irregular shape containing superabrasive grains 2 ′ in amorphous carbon 7 are formed as a large number of crushed pieces as shown in FIG. Will be. At the time of grinding the abrasive layer 10, the superabrasive grains 2 'have a higher hardness than the amorphous carbon 7 and are not crushed. Will be done.

In the next step, as shown in FIG. 3D, amorphous carbon particles 6 having an irregular shape containing superabrasive particles 2 'in a liquid phase, for example, phenol resin 4A filled in the tank, or superabrasive particles. Amorphous amorphous carbon particles 6 not containing 2 'are charged together with superabrasive particles and are dispersed and arranged by stirring or the like. Next, about 150 ° C. to 450 ° C., which is a temperature within a range where the phenol resin 4A does not deteriorate,
For example, it is baked under pressure at a low temperature of about 200 ° C. to form a solid phase.
Thus, the ring-shaped thin resin wheel 1 can be manufactured. In this case, since the resin wheel 1 is fired at a relatively low temperature of about 200 ° C., it can be manufactured as a high-precision thin plate-shaped cutter having high flatness without causing thermal distortion or the like.

Since the resin wheel 1 according to the present embodiment has the above-described configuration, the frictional resistance between the processing surface of the work material and the surface of the abrasive layer 5 during grinding and cutting is suppressed, and the resin bonding phase 4 is reduced. By ensuring the lubricity of the work material, the increase in grinding heat can be suppressed and the wear resistance of the abrasive layer 5 can be improved. In particular, since the amorphous carbon particles 6 have high lubricity and have a higher elastic modulus than, for example, a phenol resin forming the resin binder phase 4, the elastic modulus of the abrasive layer 5 can be improved and the abrasive layer 5 can be improved. Can be improved, and the mechanical strength of the abrasive grain layer 5 holding the main superabrasive grains 2 can be improved. Further, the amorphous carbon particles 6 act as a lubricant to reduce the cutting resistance against the work material to suppress the generation of the cutting heat, and in addition to the solid lubricant such as graphite. Since the hardness, compressive strength, bending strength, and the like are higher than those of the resin wheel 1, deformation and uneven wear of the resin wheel 1 can be effectively suppressed, and cutting characteristics of a work material as a cutter are improved. I do. Moreover, even if the amorphous carbon particles 6 exposed from the surface of the abrasive grain layer 5 come into contact with the work material, the frictional resistance is small, and the generation of frictional heat is suppressed to a small level.

Further, the total amount of the amorphous carbon particles 6 is in the range of 5 to 60 vol% by volume ratio of the resin binder phase 4 excluding the main superabrasive particles 2 of the abrasive layer 5.
As in the case of less than 5 vol%, the effect of reducing the grinding heat and improving the wear resistance due to the grinding resistance is not sufficient, or as in the case of more than 60 vol%, the strength of the abrasive layer 5 is greatly reduced. Therefore, it is possible to prevent the problem that the wear resistance of the abrasive layer 5 is reduced. Further, the shore hardness Hs of the amorphous carbon particles 6 is Hs
= 100 to 120, the resin wheel 1 is prevented from being deformed or unevenly worn as in the case where the Shore hardness Hs is less than 100, and the grinding resistance between the resin wheel 1 and the work material is reduced. It is possible to reduce the generation of grinding heat.

Further, when a hard wear-resistant filler such as SiO ₂ is added to the resin binder phase 4 to suppress wear of the abrasive grain layer 5 and extend the life of the grinding wheel,
By dispersing the amorphous carbon particles 6, the cutting resistance can be reduced without lowering the grinding ratio.

In this embodiment, in addition to the amorphous carbon particles 6, SiO ₂
However, the present invention is not limited thereto, and a lubricating filler and a hollow glass such as a sphere may be further dispersed in the resin binder phase 4. . Here, the lubricating filler is not particularly limited, but is preferably made of graphite, at least one filler of hBN and fluororesin, and is, for example, graphite. In this case, the cutting resistance is reduced by the lubricating fillers dispersed and arranged in the resin binder phase 4, and the sharpness is designed so that the work material can be cut smoothly by the main superabrasive grains 2 during grinding. By adding the amorphous carbon particles 6 to the resin wheel 1 having a good quality, the grinding ratio can be improved without increasing the grinding and cutting resistance. In addition, chip pockets are formed on the surface of the abrasive layer 5 by breaking the hollow glass to improve chip dischargeability, and the abrasive layer 5 is reduced by the addition of the hollow glass. The resin bond whetstone 20 whose strength can be improved by the amorphous carbon particles 6, has good sharpness, and has improved whetstone strength, particularly compression strength, can be obtained.

In the above-described embodiment,
Although the hollow glass and the wear-resistant filler or the lubricating filler are added and dispersed in the resin binder phase 4, the present invention is not limited to this. At least one of the hollow glass, the wear-resistant filler, and the lubricating filler is used. It may be omitted. Further, in the present embodiment, the outer surface of amorphous carbon particles 6 may be coated with a metal coating layer. As a result, the thermal conductivity of the abrasive layer 5 can be improved, and the heat of grinding and cutting can be quickly dissipated to prevent the resin binder phase 4 from deteriorating. In the present embodiment, the resin binding phase 4
It is assumed that the hollow glass is dispersedly arranged therein, but the present invention is not limited to this.
1% may be contained. In this case, the elasticity of the abrasive layer 5 can be improved, which has a remarkable effect on the improvement of the ground surface roughness of the work material. Here, if the pores are less than 5 vol%, the above-described effect is weak, and if the pores exceed 40 vol%, the strength of the abrasive layer 5 is reduced.

As described above, according to the resin wheel 1 of the present embodiment, since the amorphous carbon particles 6 are contained in the resin binder phase 4, they act as a lubricant and reduce the grinding resistance with the work material. In addition to being able to suppress the generation of grinding cutting heat, deformation and uneven wear of the resin wheel 1 can be effectively suppressed.
In addition, since the amorphous carbonized abrasive layer 10 is pulverized into a raw material for a grinding wheel, it is not necessary to raise the sintering temperature when manufacturing the resin wheel 1 or the like using the raw material for the grinding wheel. A thin plate-shaped cutter blade can be manufactured with high precision without receiving the same.

In the above-described embodiment, the super-abrasive grains 2 'are dispersed and arranged in a phenol resin 7 as a raw material for a grindstone and sintered to form amorphous carbon grains 6. The material for the grindstone is not limited to such a configuration and manufacturing method. For example, a phenol formaldehyde resin may be used in place of the phenol resin 7, and the superabrasive grains 2 'may be dispersed in the phenol formaldehyde resin to turn the phenol formaldehyde resin into amorphous carbon. In this case, since the phenol formaldehyde resin does not exhibit a liquid phase, it is liquefied by adding a liquid such as alcohol in advance. Then, the superabrasive grains 2 'are added and dispersed in the liquefied phenol formaldehyde resin, and then the alcohol is removed. Then, the phenol formaldehyde resin in which the superabrasive grains 2 'are dispersed is heated at about 200 ° C. in a pressurized state and baked.
By baking in a non-oxidizing atmosphere at a temperature of 00 ° C. or more, an abrasive layer in which phenol formaldehyde resin is converted into amorphous carbon can be obtained. Next, the abrasive layer is pulverized, and the pulverized amorphous carbon pulverized pieces and amorphous carbon pulverized pieces including the superabrasive grains 2 ′ are crushed together with the main superabrasive grains 2 in a phenol resin or a polyimide resin. By adding and dispersing, the resin wheel is baked at about 150 ° C. to 450 ° C., for example, about 200 ° C. in the case of a phenol resin, and about 250 to 450 ° C. in the case of a polyimide resin to obtain a thin plate-shaped resin wheel.

If a phenol formaldehyde resin is used as the material of the amorphous carbon, a higher quality amorphous carbon can be produced with a smaller degree of porosity than a material using the phenol resin.

[0023]

As described above, the grindstone raw material according to the present invention is obtained by dispersing superabrasive grains in a phenol resin and firing under pressure, and thereafter, in a non-oxidizing atmosphere at 500 ° C. or higher. Since the phenol resin is converted to amorphous carbon by firing, the abrasive layer formed by pre-amorphizing the phenol resin in which the super-abrasive particles are dispersed is used as a raw material for the grinding wheel, and then firing for manufacturing a resin-bonded grinding wheel Can be performed at a relatively low temperature, and a resin bond grindstone such as a resin wheel with high precision can be manufactured while suppressing thermal distortion.

In the resin wheel according to the present invention, an abrasive grain layer in which superabrasive grains are dispersed and dispersed in an amorphous carbonized phenol resin is crushed, and the crushed pieces are added to a phenol resin or a polyimide resin and fired. So
A thin resin wheel can be manufactured with high precision while suppressing thermal distortion. Moreover, the amorphous carbon is dispersed and arranged in a resin binder phase such as a phenol resin or a polyimide resin to act as a lubricant, thereby reducing the grinding and cutting resistance between the workpiece and the material to suppress the generation of grinding heat. Since the hardness, the compressive strength, the bending strength, and the like are larger than those of a solid lubricant such as graphite, the deformation and uneven wear of the grindstone can be effectively suppressed.

In the method for manufacturing a resin wheel according to the present invention, superabrasive grains are dispersed in a phenol resin and fired in a pressurized state, and then fired in a non-oxidizing atmosphere at 500 ° C. or higher to convert the phenol resin to an amorphous state. Since the carbonized, abrasive layer of amorphous carbon was pulverized, and the pulverized pieces were added to phenol resin or polyimide resin and fired, the firing temperature for producing resin wheels containing amorphous carbon was relatively low. The temperature can be set to a low temperature, and a resin wheel can be manufactured with high precision while suppressing thermal distortion due to firing.

The raw material for a grinding wheel according to the present invention is obtained by mixing superabrasives with a liquefied phenol formaldehyde resin, removing the liquid used for the liquefaction, and sintering the mixture. Since phenol formaldehyde resin is converted into amorphous carbon by baking in an oxidizing atmosphere, a raw material for non-porous high-quality amorphous carbon can be manufactured using phenol formaldehyde resin that does not exhibit a liquid phase, and a resin wheel can be manufactured. Can be performed at a relatively low temperature, and a resin bond grindstone such as a resin wheel can be manufactured with high precision.

In the resin wheel according to the present invention, an abrasive grain layer in which superabrasive grains are dispersed and dispersed in an amorphous carbonized phenol formaldehyde resin is crushed, and the crushed pieces are added to a phenol resin or a polyimide resin and fired. Therefore, firing can be performed at a relatively low temperature, and a thin resin wheel can be manufactured with high precision while suppressing thermal distortion. Moreover, the amorphous carbon is dispersed and arranged in the resin binder phase and acts as a lubricant, reducing the grinding and cutting resistance between the workpiece and the workpiece, suppressing the generation of grinding heat, and further reducing the generation of grinding heat with a solid lubricant such as graphite. Since the hardness, the compressive strength, the bending strength, and the like are large, it is possible to effectively suppress the deformation and uneven wear of the grindstone.

In the method for producing a resin wheel according to the present invention, a phenol formaldehyde resin is liquefied, superabrasives are mixed, the liquid used for liquefaction is removed, and the mixture is heated and calcined. Baking in a non-oxidizing atmosphere to turn phenol formaldehyde resin into amorphous carbon, crushing the amorphous carbonized abrasive layer, and adding the crushed pieces to phenol resin or polyimide resin and firing Can be performed at a relatively low temperature, and a resin wheel can be manufactured with high precision while suppressing thermal distortion.

[Brief description of the drawings]

FIG. 1A is a partial longitudinal sectional view of a resin wheel according to an embodiment of the present invention, and FIG. 1B is a sectional view of amorphous carbon particles contained in the resin wheel.

FIG. 2 is a partial longitudinal sectional view showing a modified example of the resin wheel according to the embodiment.

FIGS. 3 (a), (b), (c), and (d) show steps of manufacturing a resin wheel according to an embodiment.
(A) is a diagram showing a state in which superabrasive particles are added to a phenol resin, (b) is a diagram showing an abrasive layer obtained by sintering the superabrasive particles and the phenol resin, and (c) is an amorphous layer obtained by pulverizing the abrasive layer. FIG. 3D is a diagram showing carbon particles, and FIG. 4D is a diagram showing a state where amorphous carbon particles pulverized in a phenol resin and main superabrasive particles are added.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin wheel 2 Main superabrasive grain 2 'superabrasive grain 4 Resin bonding phase 5,10 Abrasive grain layer 6 Amorphous carbon particle (crushed piece) 7 Amorphous carbon

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) C09K 3/14 550 C04B 35/52 B (72) Inventor Masato Nakamura 246 Egoshi Egoshi Kurosuno Izumicho Iwaki City, Fukushima Prefecture -1 Mitsubishi Materials Corporation Iwaki Works F term (reference) 3C063 AA10 AB03 BB02 BB14 BC03 EE31 FF08 FF30 4G032 AA01 AA14 AA37 BA02 GA01 GA12

Claims (6)

[Claims] 1. A grindstone raw material obtained by dispersing superabrasive grains in a phenol resin and firing under pressure, and then firing in a non-oxidizing atmosphere at 500 ° C. or higher to turn the phenol resin into amorphous carbon. . 2. A resin wheel obtained by crushing an abrasive layer in which superabrasive grains are dispersed and arranged in an amorphous carbonized phenol resin, adding the crushed pieces to a phenol resin or a polyimide resin, and firing. 3. An abrasive grain layer in which superabrasive grains are dispersed in a phenol resin is fired in a pressurized state, and then fired in a non-oxidizing atmosphere at 500 ° C. or higher to convert the phenol resin into amorphous carbon. A method for manufacturing a resin wheel, comprising: grinding the amorphous carbonized abrasive grain layer; adding the ground pieces to a phenol resin or a polyimide resin; and firing the resin wheel. 4. A liquefied phenol formaldehyde resin mixed with superabrasives, the liquid used for the liquefaction is removed, and the mixture is heated and calcined.
A raw material for grinding stones made by baking in a non-oxidizing atmosphere at a temperature of ℃ or more to turn phenol formaldehyde resin into amorphous carbon. 5. A resin wheel obtained by crushing an abrasive layer in which superabrasive particles are dispersed and dispersed in an amorphous carbonized phenol formaldehyde resin, adding the crushed pieces to a phenol resin or a polyimide resin, and firing. 6. A liquid obtained by liquefying a phenol formaldehyde resin mixed with superabrasives, and thereafter, the liquid used for the liquefaction is removed, and the resultant is baked by heating, and further baked in a non-oxidizing atmosphere at 500 ° C. or higher. A method for producing a resin wheel, comprising: converting a phenol formaldehyde resin into amorphous carbon to pulverize the amorphous carbonized abrasive layer; adding the pulverized pieces to a phenol resin or a polyimide resin;