JPH0957631A - Metal bond grinding wheel and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten the strength of a binder and increase the retaining force of abrasive grains. SOLUTION: Powder of one of titanium (Group 4A in Periodic Table), vanadium (Group 5A) and chromium (Group 6A) is mixed with a powder of a metal belonging to Group 1B, whereto an organic binder is added to prepare a paste- form material. This is applied to a base of metal 6 for a grindstone (grinding wheel), and from above it, abrasive grains 1 consisting of diamond or CBN are attached. The resultant is baked at a certain temp. and subjected to provisional fixation (primary baking process). A paste form mixture prepared by using paste-form material as matrix and filling it with particulates 3 consisting of diamond or CBN is applied to the inside of each pocket 5 produced in the primary baking process. The object obtained is subjected to a secondary baking process at a specified temp. Accordingly the abrasive grains 1 are retained by a binder 4 reinforced by the particulates 3, and precluded from premature fallout.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal bond grindstone using diamond abrasive grains and the like, and a method for manufacturing the same, and more particularly to a bond material (bonding material) for bonding the above abrasive particles to the above diamond abrasive particles. While using a brazing material having good wettability between and, the abrasive grains are preliminarily attached with the brazing material having good wettability, and then fine particles composed of small diamond particles or the like in the brazing material. The present invention relates to a metal bond grindstone in which the above-mentioned abrasive grains are firmly held (gripped) by the infinite number of reinforced bonding materials.

[0002]

2. Description of the Related Art Generally, there is a problem that diamond and a metal material forming a bonding material (a brazing material) have poor wettability between them. In order to solve this problem of wettability, various measures have been conventionally made. For example, titanium (Ti) is added to the brazing material to form a semi-metallic metallizing layer on the surface of the diamond abrasive grain. A technique for improving the wettability between them is known from Japanese Patent Laid-Open No. 3-131475. By the way, since diamond is generally vulnerable to high-temperature heat, its brazing material (bonding material) is a metal having a low melting point such as copper, silver, and gold of Group 1B of the periodic table. What is mainly formed is used. That is, the silver brazing material is mainly used. Therefore, in the above conventional one, an alloy such as copper-titanium, silver-titanium, gold-titanium, etc. is formed between the metal material forming these brazing materials, and finally,
A metal bond grindstone having the above diamond abrasive grains is formed.

[0003]

By the way, in the metal-bonded grindstone having these structures, the brazing material which is the bonding material for holding the diamond abrasive grains is made of an alloy based on copper, silver, gold or the like. However, these alloys do not have a very high value in their strength. Therefore, as shown in FIG. 3, when a large load is applied to the abrasive grains 10 in, for example, heavy grinding, the bond material (brazing material) 20 is extended and the abrasive grains 10 are inclined in the load direction. There is a problem. Finally, there is a problem that the abrasive grains 10 fall off from the bond material 20.

Further, as shown in FIG. 3, during grinding,
Grinding dust (cutting dust) 990 is generated from the work 90, and this grinding dust (cutting dust) 990 is
It is sent out to the pocket portion 50 formed between the abrasive grains. The cutting chips 990 delivered to the pocket portion 50 have a sharp shape and a relatively high hardness. Therefore, when these chips 990 are sent to the brazing material 20 made of the alloy of copper, silver, gold, etc., the brazing material 2
There is a case where it bites at 0, or the portion of the brazing material 20 is microscopically scraped off. As a result, the portion of the brazing material 20 that has wetted up around the abrasive grains 10 is gradually scraped off as the grinding process continues, and eventually the holding force of the abrasive grains 10 decreases. There is a point. In order to solve these problems, it is strengthened by countless particles so that the part of the brazing material (bonding material) does not extend or it is scraped off by grinding chips (swarf). It is an object (problem) of the present invention to provide a metal bond grindstone having a bonded bond material (a brazing material).

[0005]

In order to solve the above-mentioned problems, the following measures are taken in the present invention. That is, with respect to a metal bond grindstone composed of a plurality of abrasive grains and a bonding material made of a metal material that bonds the respective abrasive grains of the plurality of abrasive grains, each of the above-mentioned abrasive grains is treated with diamond and cubic boron nitride (CBN) One of the above is used, and the bonding material is made of titanium (T
Vanadium (V), a metal of Group 4A of the Periodic Table containing i)
An alloy of any one of the metals of Group 5A of the Periodic Table containing Cr and the metals of Group 6A of the Periodic Table containing chromium (Cr) and a metal of Group 1B of the Periodic Table. The raw material is formed of diamond or cubic boron nitride (CBN), and innumerable particles in the form of small particles are filled in the raw material.

Further, regarding a metal bond grindstone composed of a plurality of abrasive grains and a bonding material made of a metal material for bonding between the respective abrasive grains of the plurality of abrasive grains, each of the above-mentioned abrasive grains is replaced with diamond and cubic boron nitride. (CBN), and each of these abrasive grains contains titanium (Ti) in Group 4A of the periodic table, and Group 5A in the periodic table containing vanadium (V). Metal and chrome (C
r) is temporarily attached to the grinding stone base metal with a brazing material made of an alloy of any one of the metals of Group 6A of the periodic table containing the metal of Group 1B of the periodic table, A metal of Group 4A of the Periodic Table containing titanium (Ti), a metal of Group 5A of the Periodic Table containing vanadium (V), and chromium (Cr) are provided between the abrasive grains thus temporarily attached. Including Periodic Table No. 6
A brazing material made of an alloy of a metal of any one of Group A metals and a metal of Group 1B of the periodic table, in which diamond and cubic boron nitride are contained. It was decided to adopt a configuration in which the bonding material filled with an infinite number of fine particles formed of any one of (CBN) was used for bonding.

Further, with respect to the metal bond grindstone having the above structure, the manufacturing method thereof is constituted by the following steps. That is, Periodic Table 4 including Titanium (Ti)
A metal powder comprising one of a Group A metal, a metal of Group 5A of the periodic table containing vanadium (V), and a metal of Group 6A of the periodic table containing chromium (Cr);
The metal powder of Group 1B of the Periodic Table and further an organic binder are mixed together, and a mixture of these powders having a paste-like property (hereinafter referred to as a paste-like object) is a grindstone made of a metal material. A step of applying it on gold, a step of applying diamond or cubic boron nitride (CBN) abrasive grains in a uniform state on the paste-like object, and a step of polishing the paste-like object. A primary firing step in which particles having a uniform adherence are fired at a predetermined temperature and the abrasive particles are temporarily attached, and a pocket formed between the abrasive particles by the primary firing step. Part of the paste-like object is made of diamond or cubic boron nitride (CBN) and is in the form of small particles. In addition to applying a number of particles in the state of being filled (hereinafter referred to as a paste-like mixture), the above-mentioned state of applying the paste-like mixture in the pocket portion is fired again at a predetermined temperature. And a firing step.

[0008]

With the above construction, the following actions are exhibited in the present invention. That is, the grindstone according to the present invention, in the temporary attachment step of the primary firing step, first, when the abrasive grains are diamond, the surface of the abrasive grains is contained in the brazing material forming the bonding material. A titanium carbide layer will be formed between the titanium (Ti) and the titanium carbide layer. Since this titanium carbide layer is composed of a semi-metallic metallizing layer, the wettability between the abrasive grains and the brazing material is improved through this metallizing layer, and both are reliably bonded. Become. Also,
The bondability with other metals forming the brazing material is improved. That is, the wettability of a brazing material made of a metal of Group 1B of the periodic table such as copper (Cu), silver (Ag), and gold (Au) to the above-mentioned abrasive grains is improved, and each abrasive grain is The brazing material ensures that the grinding stone base metal is temporarily attached, that is, held. The same applies to the case where zirconium (Zr), vanadium (V), or chromium (Cr) is adopted instead of titanium (Ti).

In the present invention, after the temporary attachment in the primary firing step, titanium (Ti) and Periodic Table 1B are provided in the pocket portion formed in the primary firing step.
A mixture in the form of a group III metal powder or an organic binder is coated with a paste-like mixture consisting of small diamonds or innumerable particles (fine particles) of cubic boron nitride (CBN). Further, since the secondary firing step of firing the material in such a state again is adopted, an innumerable number of particles are filled between the abrasive grains by passing through the secondary firing step. Raw material is present. That is, each abrasive grain is in a state of being bonded by a brazing material filled with innumerable fine particles. Since the fine particles filled in the brazing material are made of diamond or cubic boron nitride (CBN), they are mixed with titanium (Ti) contained in the brazing material in the secondary firing step. A metalizing layer made of titanium carbide (Ti C) or the like is formed between them. Through the metallizing layer, the fine particles and the brazing material are bonded together, and the brazing material and the abrasive grains are bonded together. Therefore, the abrasive grains are in a state of being connected to each other through the fine particles filled in the brazing material. That is, each abrasive grain is in solid contact with the fine particles filled in the brazing material. Incidentally, in such a state, since each abrasive grain and the stone base metal are securely held by temporary attachment in the primary firing process, depending on the secondary firing process, the abrasive grains and the stone base are There is no intrusion of fine particles with gold. Therefore, the outer diameter of the grindstone can be formed with high accuracy without the lifting of the abrasive grains.

Even if such a grindstone is subjected to heavy grinding or the like and a large force (load) is applied to each abrasive grain,
The force (load) is transmitted from the abrasive grains to the fine particles filled in the brazing material. The force (load) transmitted to the fine particles filled in the brazing material is transmitted to the surrounding fine particles and finally to the adjacent abrasive grains. That is, the force (load) input to the abrasive grains by the heavy grinding is transmitted to the adjacent abrasive grains and the like by pressing the fine particles filled in the brazing material, and is dispersed around. . As a result, the problem that the brazing material is deformed to displace (tilt) the abrasive grains does not occur. That is, it can endure heavy grinding.

Further, diamond and cubic boron nitride (CBN), which are particles (fine particles) filled in the abrasive grains and the brazing material used in the present invention, are made of a material having a very high thermal conductivity. is there. Therefore, when the metal bond grindstone according to the present invention is subjected to heavy grinding or the like, high-temperature heat is generated between the metal-bonded grindstone and the work, but the heat passes through the abrasive grains and further in the brazing material. After passing through the particles, it will be released to the whetstone base metal. That is, the grindstone according to the present invention is also excellent in heat dissipation.
Therefore, the heat generated in the work and the cutting edge by the heavy grinding is efficiently dissipated, and the cooling effect on the work surface of the work is enhanced.

Further, when grinding is performed by the grindstone according to the present invention, sharply shaped grinding dust (cutting powder) is accumulated in the pocket portion formed between the above-mentioned abrasive grains. However, in the present invention, damage to the brazing material (bonding material) due to such cutting chips is prevented. That is, in the present invention, since the portion of the bonding material (raw material) forming the pocket portion is filled with fine particles of high hardness diamond or cubic boron nitride (CBN), Even if the tip of the grinding dust (cutting powder) comes into contact with the surface of the bonding material of the pocket, the surface of the bonding material is hardly scraped off. Therefore, problems such as damage to the bonding material due to grinding dust (cutting powder), which have been a concern in the conventional one, do not occur. That is, even if the grinding process by the grindstone according to the present invention is continuously performed, the gripping force of the abrasive grains by the bonding material does not decrease, and the heavy grinding can be continued.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The configuration of the embodiment of the present invention is, as shown in FIG. 1, a plurality of abrasive grains 1 made of diamond or cubic boron nitride (CBN) and a bonding material 4 for joining between the plurality of abrasive grains 1. And a whetstone base metal 6 for holding each of the above-mentioned abrasive grains 1 and the above-mentioned bonding material 4 on the basis. In addition, in such a structure, the joining material 4 is formed based on the brazing material 2 made of a metal material. Then, in the brazing material 2, diamond or cubic boron nitride (CB
N) and is composed of an infinite number of fine particles 3 in the form of small particles.

In addition, in such a basic structure, the brazing material 2 forming a part of the joining material 4 is a periodic table containing vanadium (V), a metal of Group 4A of the periodic table containing titanium (Ti). Any one of the metals of Group 5A and the metals of Group 6A of the periodic table containing chromium (Cr) and copper (Cu
), Silver (Ag), and gold (Au), at least one metal of Group 1B of the Periodic Table is used as the basis. Consider the case where the brazing material 2 is made of titanium (Ti), copper (Cu), silver (Ag), or the like in such a structure. That is, in this case, first, the metal powder made of titanium, copper, silver or the like and the organic binder are mixed. Then, the thus mixed and paste-like material, that is, such a paste-like object 7 is applied onto the whetstone base 6 made of a metal such as iron (Fe).
In this way, the paste-like object 7 is applied, and the abrasive grains 1 made of diamond or the like are attached so as to be distributed in a uniform state. And about 84
The abrasive grains 1 are burned at 0 ° C to 940 ° C and the abrasive stone base metal 6 is added.
Attach it temporarily. As the abrasive grains 1 temporarily attached, diamond abrasive grains or cubic boron nitride (C
Any one of BN) abrasive grains, or a mixture of these diamond abrasive grains and cubic boron nitride (CBN) abrasive grains is used.

With the abrasive grains 1 temporarily attached to the whetstone base metal 6 in this way, as shown in FIG. 2D, diamond is placed in the brazing material 2 based on the alloy containing titanium (Ti). Alternatively, a paste-like mixture 8 filled with fine particles 3 made of cubic boron nitride (CBN) is applied, and a secondary firing step is performed. As a result, the bonding material 4 filled with innumerable fine particles 3 fills the spaces between the abrasive grains 1. A strong bond structure is also formed between the fine particles 3 and the brazing material 2 through the metalizing layer. That is, the abrasive grains 1 are connected to each other through the brazing material 2 filled with the fine particles 3, as shown in FIG. Thus, each abrasive grain 1 is strongly held (gripped) by the bonding material 4 formed of the brazing material 2 filled with the fine particles 3.

That is, when the brazing material 2 is a brazing material containing, for example, titanium (Ti) around the abrasive grain 1, and the abrasive grain 1 is a diamond abrasive grain,
A metalizing layer made of titanium carbide (Ti C) is formed on the surface of the abrasive grain 1. Since the metallizing layer is made of a semi-metallic material, copper (Cu) forming the brazing material 2 is
It has the property of easily fusing with metals such as silver (Ag).
Therefore, each abrasive grain 1 comes to be bonded to the brazing material 2 through the metalizing layer formed on the surface thereof, as shown in FIG. As a result, the brazing material 2 is attracted to the entire circumference of the abrasive grain 1. That is, the brazing material 2 wets up around the abrasive grain 1 and is completely bonded to the abrasive grain 1, and the brazing material 2 itself also forms a strong bonding structure by forming an alloy. .

Next, a method for manufacturing a metal bond grindstone having such a structure will be described with reference to FIG. First, of the metals of Group 4A of the Periodic Table containing titanium (Ti), the metals of Group 5A of the Periodic Table containing vanadium (V), and the metals of Group 6A of the Periodic Table containing chromium (Cr). Periodic table 1B of metal powder formed of any one of them and copper (Cu), silver (Ag), gold (Au), etc.
An appropriate organic binder is added to the group 3 metal powder and mixed to prepare a paste-like material (paste-like object) 7. Then, such a paste-like object 7 is applied onto the whetstone base metal 6 as shown in FIG. Next, as shown in FIG. 2A, diamond abrasive grains or cubic boron nitride (CB) is placed on the paste-like object 7 in such a state.
N) The abrasive grains are attached in a uniform state. As a result, as shown in FIG. 2B, a state in which the abrasive grains 1 are attached via the paste-like object 7 is formed on the whetstone base metal 6. In addition to the above, in adhering the abrasive grains 1, a method of adhering a mixture of diamond abrasive grains and cubic boron nitride (CBN) abrasive grains in a predetermined ratio, or to a specific place A method is also conceivable in which diamond abrasive grains are adhered, cubic boron nitride (CBN) abrasive grains are adhered to other places, and the abrasive grains 1 are adhered in a mottled pattern as a whole.

Next, the thus formed material is fired in the firing process, and the abrasive grains 1 are temporarily attached to the whetstone base 6 by the brazing material 2 (primary firing process). . In addition,
In this primary firing, in order to prevent the metal material forming the brazing material 2 from forming an oxide, the atmosphere in the furnace for performing the firing step is set to an atmosphere of an inert gas such as argon gas. Hold the filled state or the vacuum state. In such a state, the primary firing step is performed. At this time, the temperature inside the furnace is 840 ° C to 940 ° C.
Heated to a temperature of the order. This temperature is within a range in which a metallizing layer made of titanium carbide (Ti C) is formed on the surface of the abrasive grains 1 and various metals forming the brazing material 2 are melted to form an alloy. That is,
Abrasive grains 1 when heated at a very high temperature for a long time
However, in the case of diamond, for example, the titanium carbide layer (Ti C) on the surface of the abrasive grain 1 becomes too deep, and the bond strength with the brazing material 2 may decrease. Therefore, in order to avoid this, the firing conditions are set within the above temperature range and within an appropriate time.

By passing through the temporary attaching process by the primary firing as described above, the periphery of the abrasive grain 1 is covered with the wet metal brazing material 2 as shown in FIG. The grain 1 is held by the brazing material 2. Further, also between the brazing material 2 and the grindstone base metal 6, since they are metals, an alloy is formed, whereby the two are bonded. That is, it will be temporarily attached. When the brazing material 2 is wet up, the brazing material 2 is pulled up, and a recessed pocket portion 5 is provided between the abrasive grains 1 as shown in FIG. Will be formed.

In the above structure, the metallizing layer has zirconium carbide (Zr C), vanadium carbide (VC), or chromium carbide (Cr) instead of the titanium carbide (Ti C).
It may be formed by C) or the like. Even in this case, these metallizing layers and copper (Cu), silver (Ag
), And the metal of Group 1B of the Periodic Table containing gold (Au) are easily fused with each other, so that the wettability between the diamond abrasive grains 1 and the brazing material 2 is improved, and the bonding force between them is strengthened. . In addition, the above-described configuration is such that cubic boron nitride (C
Similarly, when BN) is used, a metallizing layer is formed between boron (B) and titanium (Ti), which strongly bonds the two.

Next, in such a state, as shown in the step (d) of FIG. 2, the recessed pocket portion formed between the abrasive grains in the step (c) of FIG. 5
And a metal powder such as titanium (Ti), a metal powder of Group 1B of the periodic table, and an organic binder, which are mixed to have a paste-like property. Formed on the basis of the body 7, a paste-like mixture 8 filled with fine particles 3 of diamond or cubic boron nitride (CBN) is applied to the paste-like body 7. In this manner, the state in which the paste-like mixture 8 is applied to the inside of the pocket portion 5 is filled with the inert gas as in the case of the primary firing step (temporary attaching step), or Re-baking is performed at a temperature of about 840 ° C. to 940 ° C. in a furnace maintained in a vacuum state (secondary baking step).

By passing through such a secondary firing step, the brazing material 2 (step (c) in FIG. 2) formed in the primary firing step (temporary attachment step) and the paste-like mixture 8 The metal powder of No. 1 is re-fused to form a new bonding material 4 (FIG. 2 (E)). The new bonding material 4 is based on a brazing material 2 containing titanium (Ti) and is filled with innumerable fine particles 3 made of diamond or cubic boron nitride (CBN). It consists of Further, titanium carbide (TiC) is provided between the fine particles 3 and the titanium-containing brazing material 2 and between the titanium-containing brazing material 2 and the abrasive grains 1.
) And the like, which are firmly bonded to each other through a metallizing layer. In particular, as shown in FIG. 2E, the bonding material 4 is densely filled with fine particles 3 having high hardness, such as diamond or cubic boron nitride (CBN). There is. As described above, the strength and surface hardness of the main bonding material 4 are increased by the filling of the fine particles 3. Therefore, even if a large load (force) is applied to the abrasive grains 1 due to heavy grinding or the like, the bonding material 4 will not be deformed.

Next, the operation and the like of the embodiment of the present invention having such a configuration will be described. The operation of the embodiment of the present invention is basically the same as that described in the above section. That is, FIG.
As shown in FIG. 1, the present metal bond grindstone formed by undergoing the respective steps as shown in FIG. 1 is provided with a bonding material 4 around the abrasive grains 1, and moreover, the bonding material 4 has ductility and It is composed of a brazing material 2 having a high malleability and a myriad of fine particles 3 filled in the brazing material 2. The fine particles 3 are made of the same diamond or cubic boron nitride (CBN) as the abrasive grains 1 and have extremely high strength and hardness. Further, on the surface of the abrasive grains 1 and the fine particles 3, when the abrasive grains 1 and the fine particles 3 are diamond, titanium carbide (Ti C), vanadium carbide (V
C), a metallizing layer made of chromium carbide (Cr C) is formed, and the brazing material 2 and the abrasive grains 1 and the fine particles 3 are strongly bonded via the metallizing layer. Become.

Also in the brazing material 2 itself, an alloy of titanium (Ti), copper (Cu), silver (Ag), gold (Au), vanadium (V), copper (Cu),
Since an alloy composed of silver (Ag), gold (Au), or an alloy composed of chromium (Cr), copper (Cu), silver (Ag), gold (Au), etc. is formed, the wettability A certain strong bonding material will be formed. Therefore, in this embodiment, based on the brazing material 2 having excellent wettability, a strong bonding material 4 filled with fine particles 3 having high hardness and high strength is provided in the brazing material 2. Will be formed.

When melting the brazing material 2 as described above, as shown in FIG. 2C, first, the abrasive grains 1 are temporarily attached to the grinding stone base metal 6 by the brazing material 2. To be done.
Then, in the temporarily attached state, as shown in FIG. 2D, the titanium (Ti) -containing brazing material 2 is placed in the pocket portion 5 formed between the abrasive grains 1. A paste-like mixture 8 filled with fine particles 3 of diamond or cubic boron nitride (CBN), which is the base and is filled with the brazing material 2, is applied, and a secondary firing step is performed. Thereby, each of the above-mentioned abrasive grains 1 is
The bonding material 4 reinforced by the innumerable fine particles 3 strongly holds (grips) the grindstone base metal 6.

As described above, in the embodiment of the present invention, fine particles 3 having a high hardness are densely packed in the brazing material 2 having the above-described structure, as shown in FIG. Therefore, the surface hardness of the pocket portion 5 is also very high. Therefore, even if the grinding dust (cutting powder) 99 cut out from the work scrapes the portion of the bonding material 4 around the abrasive grains 1 in the pocket portion 5, the surface of the bonding material 4 is Almost never scraped off. Therefore, the surface layer of the bonding material 4 is not damaged,
The abrasive grains 1 are strongly gripped together with the portion of the brazing material 2 which is rich in wettability. As a result, the abrasive grains 1 do not fall off at an early stage.

Further, in the embodiment of the present invention, a concave portion is formed between the abrasive grains 1 due to the wetting phenomenon of the brazing material 2, and the concave portion is used as a basis. The pocket portion 5 as shown in FIG. 1 is formed. And these will form an escape part in a grinding wheel. Further, this relief portion is in a continuous state in its plan view (the grinding surface of the grindstone) and forms an escape groove on the grinding surface.
Therefore, the pocket portion (relief portion) 5 forms an oil reservoir for grinding oil or a reservoir for grinding debris (cutting chips) during grinding, and also forms these escape grooves. Therefore, the cutting powder 9 collected in the pocket 5 is
9 is discharged together with the grinding oil through the clearance groove. As a result, the pocket portion 5 contributes to cooling the grinding wheel and the work.

[0028]

According to the present invention, with respect to a metal bond grindstone composed of a plurality of abrasive grains and a bonding material made of a metal material for bonding the respective abrasive grains of the plurality of abrasive grains,
It is formed of either one of diamond and cubic boron nitride (CBN), and each of these abrasive grains contains vanadium (V), a metal of Group 4A of the periodic table containing titanium (Ti). Metals of Group 5A of the Periodic Table,
And a chromium (Cr) metal of any one of Group 6A of the Periodic Table and a metal of Group 1B of the Periodic Table, and a brazing material temporarily attached to the base metal of the grindstone. Furthermore, titanium (T
Vanadium (V), a metal of Group 4A of the Periodic Table containing i)
An alloy of a metal of any one of the metals of Group 5A of the Periodic Table and a metal of Group 6A of the Periodic Table containing chromium (Cr) with a metal of Group 1B of the Periodic Table. And a bonding material filled with an infinite number of fine particles formed of either diamond or cubic boron nitride (CBN). Since the configuration is such that they are bonded, the abrasive grains are held by a bonding material based on a flexible brazing material, and the brazing material and the abrasive grains are the surface of the abrasive grains. The entire bonding is performed through the metallizing layer formed in the above, and the abrasive grains are strongly held (gripped) by the bonding material.
Further, in the bonding material, a myriad of fine particles made of the same material as the abrasive grains are filled, so that the strength and rigidity of the flexible bonding material can be increased. The abrasive grains are strongly held by the above-mentioned bonding material, and can withstand heavy grinding.

Further, since each of the above-mentioned abrasive grains is surely held on the grindstone base metal by the temporary attachment means, depending on the secondary firing step, a fine gap may be formed between the abrasive grains and the grindstone base metal. No more particles intrude. Therefore, lifting of the abrasive grains is eliminated, and the outer diameter of the grindstone can be finished with high precision, and it is not necessary to perform truing processing after the grindstone is formed. Further, since the surface hardness of the bonding material is increased by filling the above-mentioned fine particles, abrasion of the bonding material due to grinding debris (cutting powder) can be prevented, which also contributes to early polishing of the abrasive grains. It came to be prevented from falling off.

Further, regarding the metal-bonded grindstone having the above structure, the manufacturing method is as follows: a metal of Group 4A of the periodic table containing titanium (Ti); a metal of Group 5A of the periodic table containing vanadium (V); A metal powder made of any one of the metals of Group 6A of the Periodic Table containing chromium (Cr), a metal powder of Group 1B of the Periodic Table, and an organic binder are mixed and A step of applying a mixture having a paste-like property (hereinafter referred to as a paste-like object) on a grinding stone base made of a metal material, and diamond or a cube on which the paste-like object is applied. A step of uniformly adhering a group of abrasive grains made of crystallized boron nitride (CBN), and a state in which the abrasive grains are adhered on these paste-like objects is fired at a predetermined temperature and temporarily attached. Based on the paste-like object, a diamond or a cubic boron nitride (in the first baking step, which is to be formed between the abrasive grains by the primary baking step, in the paste-like object. CBN) and innumerable particles in the form of small particles (hereinafter referred to as a paste-like mixture) are applied, and the above-mentioned paste-like mixture is applied in the pocket portion. The secondary firing process of re-firing the material at a predetermined temperature is performed, so that the holding force (grip force) of the abrasive grains is enhanced and the wear resistance of the pocket surface is enhanced. Also, metal bond grindstones have come to be manufactured easily and inexpensively.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing the overall configuration of a metal bond grindstone according to the present invention.

FIG. 2 is a view showing a manufacturing process of a metal bond grinding wheel according to the present invention.

FIG. 3 is a partial cross-sectional view showing a structure of a metal bond grindstone according to a conventional example.

[Explanation of symbols]

 1 Abrasive Grain 2 Raw Material 3 Particle (Fine Particle) 4 Bonding Material 5 Pocket 6 Grindstone Base Metal 7 Paste Object 8 Paste Mixture 99 Grinding Chips

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Noboru Hiraiwa, No. 1 Shiroyama, Maiki-cho, Okazaki-shi, Aichi 54 Toyoda Banmops Co., Ltd. (72) Takayuki Moroto, No. 54, Shiroyama, Maiki-cho, Okazaki, Aichi Prefecture Incorporated (72) Inventor Akasa Ninomiya 1-1, Asahi-cho, Kariya city, Aichi Toyota Koki Co., Ltd.

Claims (3)

[Claims] 1. A metal bond grindstone formed of a plurality of abrasive grains and a bonding material made of a metal material for bonding between the plurality of abrasive grains, wherein the abrasive grains are diamond and diamond. Vanadium, a metal of Group 4A of the periodic table containing titanium (Ti), is used as a bonding material which is formed of either one of cubic boron nitride (CBN) and bonds between these abrasive grains. Periodic Table 5A including (V)
It is formed of a brazing material made of an alloy of a metal of Group 1 and a metal of Group 1A of the Periodic Table, which contains chromium (Cr), and a metal of Group 1B of the Periodic Table. Further, in the brazing material, innumerable particles which are formed of either diamond or cubic boron nitride (CBN) and have a form smaller than the above-mentioned abrasive grains are used. A metal-bonded grindstone characterized by having the above structure. 2. A metal bond grindstone formed by a plurality of abrasive grains and a bonding material made of a metal material for bonding between the plurality of abrasive grains, wherein the abrasive grains are diamond and diamond. While forming with either one of cubic boron nitride (CBN), each of these abrasive grains,
Any of a metal of Group 4A of the periodic table containing titanium (Ti), a metal of Group 5A of the periodic table containing vanadium (V), and a metal of Group 6A of the periodic table containing chromium (Cr) A brazing material made of an alloy of a metal of one group and a metal of Group 1B of the periodic table is temporarily attached on the base metal of the grindstone, and the titanium particles are fixed between the abrasive grains thus temporarily attached. Any one of a metal of Group 4A of the periodic table containing (Ti), a metal of Group 5A of the periodic table containing vanadium (V), and a metal of Group 6A of the periodic table containing chromium (Cr). It is formed of a brazing material composed of an alloy of a metal of Group 1 and a metal of Group 1B of the Periodic Table, in which one of diamond and cubic boron nitride (CBN) is contained. We decided to join with a bonding material filled with innumerable fine particles formed by things Metal bond whetstone characterized by being composed of 3. A metal of Group 4A of the periodic table containing titanium (Ti), a metal of Group 5A of the periodic table containing vanadium (V), and a metal of Group 6A of the periodic table containing chromium (Cr). A metal powder comprising any one of the above, a metal powder of Group 1B of the Periodic Table, and an organic binder, and the mixture thereof having a paste-like property A step of applying (hereinafter referred to as a paste-like object) onto a whetstone base made of a metal material,
A step of uniformly applying an abrasive grain group formed by either one of diamond and cubic boron nitride (CBN) on the applied paste-like object, and the paste-like object A primary firing step of firing at a predetermined temperature a state in which the abrasive grains are evenly attached,
One of diamond and cubic boron nitride (CBN) is included in the paste-like object in the pocket formed between the abrasive grains by the primary firing step, based on the paste-like object. In addition to applying one of the above, innumerable particles in the form of small particles (hereinafter referred to as a paste mixture) are applied, and the paste mixture is applied in the pocket portion in this manner. And a secondary firing step in which the material in the above state is fired again at a predetermined temperature.