JPH0569332A - Composite aluminum group grinding wheel and its manufacture - Google Patents

Abstract

PURPOSE:To reduce weight and improve the abrasion resistance of an abrasive grain layer by using a composite aluminum group as a binder. CONSTITUTION:An abrasive grain layer is composed of a spongy metallic core bodies 10, which are having three-dimensional network structure, and in which super abrasive grains and whiskers 16 are dispersedly arranged on a fiber surface of the structure; and filling layers 22 consisting of aluminum or aluminum alloy packed in respective pores of the spongy metallic core bodies 10. Hard intermetallic compound layers 20 of metal, composing the spongy metallic core bodies 10, and aluminum are formed on interface surfaces between the filling layers 22 and the spongy metallic core bodies 10. Many independent pores are formed between parts of super abrasive grains 14, inside of the spongy metallic core bodies 10, and fibers themselves of the spongy metallic core bodies 10 are made porous.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite aluminum-based grindstone which is lighter than a normal metal-bonded grindstone and has an abrasive layer having a proper wear resistance, and a method for producing the same.

[0002]

2. Description of the Related Art Conventional metal bond grindstones are made of Cu, S
After mixing metal powder (bonding material) such as n, tungsten carbide, Fe, and Ni with superabrasive grains such as diamond or CBN, it is filled with a base metal into a mold, pressure-molded, and sintered. After sintering, a shape is given by grinding or electric discharge machining to obtain a product.

As a material of the base metal, it is an essential condition that it can withstand the thermal strain during sintering of the above-mentioned binder, and in general, S is used.
45C, SK5, brass, etc. are used.

[0004]

Since the conventional metal-bonded grindstone uses a material having a relatively large specific gravity as described above as a binder and a base metal, the grindstone inevitably has a large weight and mechanical rigidity. The small grinder had the drawback that it could not be registered. In addition, a large driving force is required at the time of high-speed rotation, and vibration due to an imbalance in weight is likely to occur, which makes it difficult to use.

Therefore, it is conceivable to use lightweight aluminum or aluminum alloy as the metal binder, but these metals are too soft and lack sufficient force to hold the superabrasive grains, so that sufficient grinding ability cannot be obtained. Therefore, it is not practical.

[0006]

The present invention has been made to solve the above problems, and a composite aluminum-based grindstone of the present invention has a three-dimensional network structure in which superabrasive grains are dispersedly arranged in the fibers. An abrasive grain layer comprising a spongy metal core made of Ni, Co, Cu or an alloy thereof and a filling layer made of aluminum or an aluminum alloy filled in each cell of the spongy metal core. A grindstone having, the boundary surface of the filling layer and the spongy metal core,
An intermetallic compound layer of the metal and aluminum forming the spongy metal core is formed, and in each fiber of the spongy metal core, a large number of pores are formed between some of the superabrasive grains. It is characterized by being

Whiskers may be dispersed in the fibers of the spongy metal core together with the superabrasive grains. Further, in the fibers of the spongy metal core, continuous ventilation holes may be formed along the centers of these fibers.

On the other hand, in the method for producing the composite aluminum-based grindstone of the present invention, while precipitating the metal plating phase on the fiber surface of the resin porous body having the three-dimensional network structure, the superabrasive grains whose surface is metal-coated in advance are fixed. Then, after creating a spongy metal core body in which the fiber itself is porous and has a spongy shape as a whole,
Each cell of the spongy metal core is filled with a molten metal of aluminum or an aluminum alloy to form a filling layer, and at the same time, an intermetallic compound layer is formed on the boundary surface between the metal plating phase and the filling layer to polish the metal. The feature is to obtain a grain layer.

When fixing the superabrasive grains, whiskers may be fixed to the surface of the porous resin body together with the superabrasive grains.

[0010]

In the composite aluminum-based grindstone of the present invention, since the filling layer occupying most of the abrasive grain layer is made of aluminum or aluminum alloy having a small specific gravity, the weight of the abrasive grain layer itself can be reduced and the abrasive grain layer itself can be reduced. Since the grain layer does not require sintering,
The base metal does not require heat distortion resistance, and a base metal that is lighter than a conventional metal bond grindstone can be used, and the grindstone can be made lighter as a whole.

In addition, since a spongy metal core is embedded in the entire area of the abrasive grain layer and a hard intermetallic compound is present throughout the surface layer of the spongy metal core, soft aluminum (alloy) is used. While using, the strength of the abrasive grain layer is high and it is difficult to deform.

Further, since the hard intermetallic compound layer is formed only in the vicinity of the abrasive grains, the intermetallic compound layer supports the abrasive grains and enhances the abrasive grain holding force. Therefore,
Even under harsh grinding conditions, unnecessary grain removal does not occur, and it can withstand heavy grinding.

Further, since the portion of the filling layer remains relatively soft, when the filling layer is exposed to the grinding surface, the wear rate at the portion where the filling layer is exposed is relatively high, and the portion of the filling layer is locally worn. As a result, a recess is formed. At the same time, since pores are formed between some of the superabrasive grains inside the spongy metal core, these pores are also sequentially opened on the ground surface as the abrasive grain layer is worn. Therefore, both the concave portion and the pores act as chip pockets and discharge chips during grinding, so that the chip discharging property is improved.

When whiskers are fixed to the spongy metal core together with the superabrasive grains, these whiskers are also taken into the inside of the filling layer, so that the spongy metal core and the filling layer are bonded together. In addition to improving the force, the strength of the filling layer itself is improved, and the strength of the abrasive grain layer is further increased.

Further, when the fibers forming the spongy metal core are hollow, the continuous ventilation holes having a three-dimensional mesh structure are formed inside the abrasive grain layer, and therefore the abrasive grains are passed through these continuous ventilation holes. The grinding liquid flows in and out of the layer, and the cooling property of the abrasive grain layer and the chip discharge property are improved.

On the other hand, according to the method of the present invention, the metal-coated superabrasive grains are adhered to the fiber surface of the resin porous body having a three-dimensional network structure while precipitating the metal plating phase, and are themselves sponge-like. After the metal core is prepared, the spongy metal core is filled with the molten metal of aluminum or aluminum alloy to form the filling layer, so that the grindstone having the above-described excellent effects can be easily obtained. Further, since the sintering process is not included, the flexibility of the material of the base metal is high. Further, the base metal itself has an advantage that it can be integrally molded with an aluminum alloy.

[0017]

EXAMPLES Examples of the composite aluminum-based grindstone and the method for producing the same according to the present invention will be described in detail below.

FIG. 1 is an enlarged sectional view showing an abrasive grain layer of an embodiment of a composite aluminum-based grindstone. The present invention is characterized by the internal structure of the abrasive layer, the material and shape of the base metal, the shape of the abrasive layer is any shape conventionally used,
It may be made of a material, or may be used as a grindstone having only an abrasive grain layer without a base metal, if necessary.

This abrasive grain layer is mainly composed of a spongy metal core having a three-dimensional mesh structure shown by reference numeral 10 in FIG. 1 and a filling layer 22 filled in each pore of the spongy metal core 10. It is composed.

The spongy metal core 10 has a metal coating 2 on the surface of each fiber of the metal body 12 having a non-directional three-dimensional mesh structure.
4 (FIG. 2), the superabrasive grains 14 such as diamond or CBN, and the whiskers 16 are uniformly dispersed and embedded, and as shown in FIG. 2, a part of the superabrasive grains 14 and the whiskers 16 are formed. Between the independent pores 26
Are formed in large numbers. Further, in the center of each fiber of the spongy metal core body 10, as shown in FIG. 1, continuous ventilation holes 18 are formed throughout the entire length.

The material of the metal body 12 is Ni, C
o, Cu, Cr, etc. can be used, but especially the filling layer 2
A hard intermetallic compound (Ni
Ni or a Ni alloy is preferable because it forms Al).

The ratio of the metal body 12 in the abrasive grain layer is 5
It is preferably about 50% by volume. 5 vol%
If it is less than the above range, sufficient abrasion resistance of the abrasive grain layer cannot be obtained, and the abrasive grain retaining force becomes insufficient. On the other hand, when it is more than 50 vol%, the abrasion resistance of the abrasive grain layer is too strong, and the action of causing the superabrasive grains 14 to appropriately grow on the ground surface (autogenic blade action) is lowered, and the sharpness is deteriorated. ..

The average grain size of the superabrasive grains 14 is appropriately determined according to the method of using the grindstone. Superabrasive grain 1 occupying the entire abrasive grain layer
The content of 4 is 3 to 35 vol%, and if it is out of these ranges, the sharpness and the grinding ability are deteriorated and it cannot be used.
More specifically, the optimum value of the content of abrasive grains depends on the use of the grindstone as described below. Straight grindstone: 5 to 35 vol% Cup grindstone: 3 to 30 vol%

The content of the whiskers 16 in the whole abrasive grain layer is 0.5 to 20% by volume. If the whisker content is less than 0.5 vol%, sufficient toughness of the abrasive grain layer cannot be obtained. On the other hand, when it is more than 20 vol%, the abrasion resistance of the abrasive grain layer is too strong, the self-developing blade action is lowered, and the sharpness is deteriorated. More specifically, the optimum value of the whisker content depends on the application of the grindstone as described below. Straight grindstone: 2 to 15 vol% Cup grindstone: 1 to 10 vol%

The material of the whiskers 16 is SiC,
Si ₃ N ₄ , potassium titanate and the like are preferable, and among these, Si ₃ N _{4 which} has excellent strength is particularly preferable. The length of the whiskers is not particularly limited, but from the viewpoint of enhancing the strength of the abrasive grain layer, about 5 to 50 μm is effective.

The total porosity of the abrasive grain layer in which the volumes of the independent pores 26 and the continuous air holes 18 are combined is preferably about 3 to 50 vol%. If the total porosity is less than 3 vol%, the cooling effect is reduced, or the chip pocket forming effect is reduced, and the chip discharge property is reduced. On the other hand, if the total porosity is higher than 50 vol%, the abrasive grain holding power becomes insufficient, resulting in unnecessary loss of abrasive grains.

Next, a method of manufacturing the grindstone having the above structure will be described. First, the resin porous body 30 as shown in FIG.
To prepare. The resin porous body 30 is a highly foamed resin using a foaming agent, and has an isotropic three-dimensional network structure.

As a concrete material for the porous resin body 30, polyurethane foam or the like, which is easy to mold and inexpensive, is suitable. For example, “Eperlite SF” (trade name) manufactured by Bridgestone Corporation has high cell-to-cell communication and is suitable for the purpose of the present invention. In addition, what is called a cell here is the resin porous body 3 as shown by the code | symbol C in FIG.
It is a substantially spherical bubble-like space surrounded by mesh fibers inside 0.

The cell diameter of the resin porous body 30 is equal to that of the superabrasive grains 14.
It is desirable that the average particle diameter is 5 times or more. If this value is less than 5 times, the electrodeposition of the superabrasive grains 14 will be hindered in the electrodeposition process described below, and it will be difficult for the superabrasive grains 14 to be uniformly dispersed in the metal body 12.

Next, over the entire surface of the fibers of the resin porous body 30, a metal coating as a base for forming the metal body 12 is formed by electroless plating. Specifically, first, the surface of the resin porous body 30 is subjected to a surface catalyzation treatment for promoting metal deposition.

This treatment is for providing precious metal catalyst nuclei such as Au, Pt, Pd and Ag. For example, PdCl is used.
_The porous resin body 30 is immersed in a salt solution of the precious metal such as ₂ to adsorb the precious metal on the surface of the porous resin body 30, and then washed with water. The conditions such as the concentration of the treatment solution, the temperature, and the treatment time at that time may be the same as those in the case of performing the conventional electroless plating.

The resin porous body 30 which has been treated is treated with Ni,
It is immersed in an electroless plating solution containing metal ions such as Co and Cu, and a metal coating is formed under appropriate treatment conditions. The thickness of the metal coating may be about 1-5 μm.

Next, the metal body 12 is deposited on the metal coating of the resin porous body 30, and the superabrasive grains 14 and the whiskers 16 coated with the metal are dispersed therein to form the spongy metal core 10. To do. Although the electroless plating method can be used to deposit and form the metal body 12, since the deposition rate is low, the electrolytic plating method is more efficient.

The metal-coated superabrasive grains have been commercially available, and the surface of the superabrasive grains 14 such as diamond or CBN is coated with a metal coating 24 as shown in FIG. Is formed in. Ni, Co, Cu or the like can be used as the material of the metal coating 24, and the thickness thereof is about 1 to 5 μm.

To form the metal body 12 by electrolytic plating, the metal-coated resin porous body 30 and the anode are immersed in an electrolytic plating solution containing metal ions to form the metal body 12, and the metal body 12 is immersed in the electrolytic plating solution. While the metal-coated superabrasive grains 14 and the whiskers 16 are dispersed, the resin porous body 30 is used as a cathode to conduct electricity.

Then, the superabrasive grains 14 and the whiskers 16 are uniformly dispersed inside the cells C of the resin porous body 30, and a part of them is taken into the metal body 12 deposited on the metal coating of each part. In this process, the metal body 12 is not deposited only on the metal coating of the resin porous body 30, but is also deposited on the metal coating 24 of the superabrasive grains 14 conducting to the metal coating of the resin porous body 30. Since they are sequentially deposited, the independent pores 26 partially remain between the superabrasive grains 14, and the metal body 12 becomes porous. When the metal body 12 reaches a predetermined thickness, the current supply is stopped and the metal body 12 is washed to obtain the spongy metal core body 10 containing the porous resin body 30 as shown in FIG.

Next, in the cell C of the spongy metal core 10,
A filling layer 22 is formed by filling a molten metal of Al or Al alloy. At this time, the resin porous body 30 remaining in the spongy metal core 10 is decomposed by the heat of the molten metal, most of it is removed, and the continuous ventilation hole 18 is formed in the trace.

At the same time, Al in the molten metal and the spongy metal core 1
As shown in FIG. 1, the intermetallic compound (NiAl,
(CoAl, CuAl, etc.) is generated, and the intermetallic compound layer 20 having a three-dimensional network structure is constructed. Since the molten metal also partially penetrates into the open pores 26 of the spongy metal core body 10, the intermetallic compound layer 20 is formed into an extremely complicated three-dimensional structure.

In order to completely remove the resin porous body 30 from the spongy metal core body 10, another heating step may be provided, or at the stage of the spongy metal core body 10, the metal body 12 is formed. It is also possible to immerse the spongy metal core 10 in a concentrated alkaline solution or the like that does not dissolve the resin porous body 30 and dissolves and removes the resin porous body 30.

When the molten metal is sufficiently solidified, it is shaped and fixed on a base metal to form a grindstone. At this time, both ends of the spongy metal core 10 may be ground by a predetermined thickness to expose the ends of the continuous ventilation holes 18. In that case, it is also possible to supply water to the grinding surface from the base metal through the continuous ventilation hole 18.

According to the composite aluminum-based grindstone having the above structure, the following excellent effects can be obtained. The filling layer 22 occupying most of the abrasive grain layer is made of aluminum or aluminum alloy having a small specific gravity, and a large number of pores 18 and 26 are formed inside the spongy metal core body 10. In addition to reducing the weight of itself,
Since the abrasive grain layer does not need to be sintered, the base metal is not required to have heat distortion resistance, and a base metal lighter than the conventional metal bond grindstone can be used. Therefore, the entire grindstone can be significantly reduced in weight, can be mounted on a grinder having low mechanical rigidity, and can be easily used under high-speed rotation conditions.

A spongy metal core 1 is formed on the entire surface of the abrasive grain layer.
0 is buried, and the hard intermetallic compound layer 20 is further present on the entire surface layer of the spongy metal core body 10. Therefore, the filling layer 22 is made of soft aluminum (alloy). In addition, the strength of the abrasive grain layer is high and it is difficult to deform, and is comparable to the general metal bond abrasive grain layer.

Since the hard intermetallic compound layer 20 is formed only near the superabrasive grains 14, the intermetallic compound layer 20 supports the superabrasive grains 14 to enhance the abrasive grain holding force,
Even under harsh grinding conditions, unnecessary grain removal does not occur and it withstands heavy grinding and has a long life.

Particularly in the present invention, since the metal body 12 of the spongy metal core body 10 is made into a porous body including a large number of independent pores 26 by using the metal-coated superabrasive grains 14, the filling layer 22 is The intermetallic compound layer 20 is formed into an extremely complicated three-dimensional structure by penetrating into the open independent pores 26. Therefore, the effects of the above are further enhanced as compared with the case where the independent pores 26 are not formed.

Since the portion of the filling layer 22 is relatively soft, when the filling layer 22 is exposed to the ground surface, the wear rate at this exposed portion is relatively high, and it locally wears to cause chip pockets (recesses). ) Occurs. Since these chip pockets discharge chips during grinding, the chip discharging property is high and clogging is less likely to occur.

Whiskers 16 on the spongy metal core 10
Are dispersed and the whiskers 16 are also taken inside the filling layer 22, so that the spongy metal core 10 and the filling layer 22 have a high binding force, and the strength of the filling layer 22 itself is also increased, which is synergistic. The effect further improves the strength of the abrasive grain layer.

A large number of continuous ventilation holes 18 and independent pores 26 having a three-dimensional mesh structure are formed inside the sponge-like metal core body 10, and the grinding fluid enters and leaves the abrasive grain layer through these pores 18 and 24. The cooling performance is high and the chip discharging property can be further improved. Further, since the pores 18 and 24 are formed over the entire area of the abrasive grain layer, the abrasive grain layer has a cushioning property. Therefore, although the abrasive grain layer strength is high, each superabrasive grain 14 hits the work material softly, and it is possible to prevent the superabrasive grain 14 from excessively penetrating the work material and improve the finished surface roughness.

On the other hand, according to the method of the present invention, it is possible to easily obtain a grindstone having the above-mentioned excellent effects. Moreover, since the sintering is not included, the degree of freedom of the material of the base metal is improved. In addition, since the resin porous body 30 such as polyurethane foam can be adjusted in a wide range of fiber diameter and cell diameter, it has an advantage that the distribution density of the superabrasive grains 14 can be arbitrarily set according to the application of the grindstone. ing.

In the present invention, the whiskers 16 may not be dispersed in the abrasive grain layer, or a filler other than the whiskers, such as graphite particles or SiC particles, may be added to the abrasive grain layer. ..

[0050]

[Experimental Example] Next, the effect of the present invention will be demonstrated with reference to an experimental example. (Experimental example) As the resin porous body 30, HR-13 (cell range: 11 to 16 cells / inch) of "Epperlite SF" manufactured by Bridgestone Co., Ltd. is prepared, and first immersed in a PdCl ₂ solution and held for 30 minutes. After that, by washing with water,
A catalytic nucleus of Pd was provided. This resin porous body 30 is
It was dipped in an electroless plating solution to form a metal coating of 3 μm.

Next, the metal-coated resin porous body 30 and the anode are immersed in an electrolytic plating solution containing Ni ions to disperse the metal-coated diamond superabrasive grains 14 and whiskers 16 in the electrolytic plating solution. While stirring, the resin porous body 30 is used as a cathode to energize the metal body 12 to 150 μm.
Formed to a thickness of.

The average grain size of the superabrasive grains is 50 μm, the metal coating species on the superabrasive grains is electroless Ni plating, the thickness of this metal coating is 1 μm, the whisker species is Si ₃ N ₄ , and the whisker length is 3
It was set to 0 μm.

Next, in the cell C of the spongy metal core 10,
A molten metal of an Al alloy (AC4C) that was heated and melted at 650 ° C. was filled to form the filling layer 22. At this time, the resin porous body 30 remaining in the spongy metal core 10 was decomposed by the heat of the molten metal, and most of it was removed.

After the molten metal was sufficiently solidified, the abrasive grain layer was shaped to obtain a straight type grindstone. The size of the obtained grindstone has an outer diameter of 20.
The thickness was 0 mm, the thickness was 5 mm, the thickness of the abrasive layer was 5 mm, and the inner diameter of the central hole was 40 mm. When the internal structure was observed with a microscope, the ratio of the metal body 12 in the abrasive grain layer: 32 vol
%, Content of superabrasive grains 14: 11 vol%, continuous ventilation hole 18
And the total number of independent pores 26: 9 vol%, content of whiskers 16: 6 vol%, intermetallic compound layer (Ni
The thickness of Al) 20 was 20 μm, and the weight of the grindstone was 410 g.

Next, a grinding test was performed on the work material with the above grindstone. The experimental conditions are as follows. Work Material: 92% Al ₂ O ₃ Work Material Dimensions: 100 mm x 100 mm x 5 mm Grindstone peripheral speed: 1500 m / min Cutting depth: 0.03 mm Grinding method: Wet

(Comparative Example) On the other hand, the same experiment as described above was conducted using a Cu-Sn based metal bond grindstone as a comparative example. The dimensions of the grindstone and base metal are exactly the same as in the above experimental example. As the base metal material, S45C is used because it undergoes a sintering process.

The composition of the binder in the abrasive layer is 90% by weight of Cu,
The Sn weight of 10%, the content of superabrasive grains and the average grain size are the same as those in the above-mentioned experimental example. However, no metal coating was formed on the superabrasive grains and no whiskers were dispersed. Wheel weight is 1
250 g, the porosity of the abrasive layer was zero.

Table 1 shows the results of grinding using the above two types of grindstones. The grinding ratio is the ratio of the amount of the removed work material to the amount of wear of the grindstone, and the grinding power is the value after 20 m grinding.

[0059]

[Table 1]

[0060]

As described above, according to the composite aluminum-based grindstone of the present invention, the filling layer occupying most of the abrasive grain layer is made of aluminum or aluminum alloy having a small specific gravity. The weight of the grain layer itself can be reduced, and since the abrasive grain layer does not need to be sintered, the base metal is not required to have heat distortion resistance, and a base metal lighter than a conventional metal bond grindstone can be used. Therefore, the entire grindstone can be significantly reduced in weight, can be mounted on a grinder having low mechanical rigidity, and can be easily used under high-speed rotation conditions.

Further, since the spongy metal core is embedded in the entire area of the abrasive grain layer and the hard intermetallic compound is present in the entire surface layer of the spongy metal core, soft aluminum (alloy) is used. While using, the strength of the abrasive grain layer is high and it is difficult to deform.

Further, since the hard intermetallic compound layer is formed only in the vicinity of the abrasive grains, the intermetallic compound layer supports the abrasive grains to enhance the abrasive grain holding force. Therefore,
Even under harsh grinding conditions, unnecessary grain removal does not occur, and it can withstand heavy grinding.

Further, since the portion of the filling layer remains relatively soft, when the filling layer is exposed to the ground surface, the wear rate at the portion where the filling layer is exposed is relatively high, and the portion of the filling layer is locally worn. As a result, a recess is formed. At the same time, since pores are formed between some of the superabrasive grains inside the spongy metal core, these pores are also sequentially opened on the ground surface as the abrasive grain layer is worn. Therefore, since both the concave portion and the pores function as chip pockets and discharge chips during grinding, the chip discharging property is improved and clogging is less likely to occur.

When the whiskers are fixed to the spongy metal core together with the superabrasive grains, these whiskers are also taken into the inside of the filling layer, so that the spongy metal core and the filling layer are bonded together. In addition to improving the force, the strength of the filling layer itself is improved, and the synergistic effect of these increases the strength of the abrasive grain layer.

Further, when the fibers constituting the spongy metal core are hollow, the continuous ventilation holes having a three-dimensional network structure are formed inside the abrasive grain layer, and therefore the abrasive grains are passed through these continuous ventilation holes. The grinding liquid flows in and out of the layer, and the cooling property of the abrasive grain layer and the chip discharge property are improved.

On the other hand, according to the method of the present invention, the metal-coated superabrasive grains are adhered to the fiber surface of the resin porous body having a three-dimensional network structure while precipitating the metal plating phase, and are themselves porous sponge-like. After the metal core is prepared, the spongy metal core is filled with the molten metal of aluminum or aluminum alloy to form the filling layer, so that the grindstone having the above-described excellent effects can be easily obtained. Further, since the sintering process is not included, the flexibility of the material of the base metal is high.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing an abrasive grain layer of an example of a composite aluminum-based grindstone according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a spongy metal core body of the whetstone.

FIG. 3 is an enlarged view showing a resin porous body used in the method for manufacturing the whetstone.

FIG. 4 is an enlarged cross-sectional view showing a spongy metal core before forming a filling layer.

[Explanation of symbols]

 10 Spongy Metal Core 12 Metal Body 14 Super Abrasive Grains 16 Whiskers 18 Continuous Vents 20 Intermetallic Compound Layer 22 Filling Layer 24 Metallic Coating of Super Abrasive Grains 26 Independent Porosity 30 Resin Porous Body C Cell

Claims (5)

[Claims] 1. A sponge-like metal core body made of Ni, Co, Cu or an alloy thereof in which superabrasive grains are dispersed and arranged in a fiber having a three-dimensional network structure, and each of the sponge-like metal core bodies. A grindstone having an abrasive grain layer having a filling layer made of aluminum or an aluminum alloy filled in a cell, wherein the spongy metal core is provided at an interface between the filling layer and the spongy metal core. An intermetallic compound layer of a metal constituting the body and aluminum is formed, and in each fiber of the spongy metal core, a large number of pores are formed between a part of the superabrasive grains, A composite aluminum-based grindstone. 2. The composite aluminum-based grindstone according to claim 1, wherein whiskers together with superabrasive grains are dispersed in the fibers of the spongy metal core. 3. The composite aluminum-based grindstone according to claim 1, wherein in the fibers of said spongy metal core body, continuous ventilation holes are formed along the centers of these fibers. 4. Precipitating a metal plating phase on a fiber surface of a resin porous body having a three-dimensional network structure and fixing superabrasive grains whose surface is metal-coated in advance, and the fiber itself is porous and sponge as a whole. After creating a spongy metal core that makes a shape,
Each cell of the spongy metal core is filled with molten metal of aluminum or aluminum alloy to form a filling layer, and at the same time, an intermetallic compound layer is formed on the interface between the metal plating phase and the filling layer to form abrasive grains. A method for producing a composite aluminum-based grindstone, which comprises obtaining a layer. 5. The method for producing a composite aluminum-based grindstone according to claim 4, wherein whiskers are fixed together with the superabrasive particles on the surface of the resin porous body when the superabrasive particles are fixed.