KR101001255B1 - Method for Manufacturing Grinding Tool Using Thermal Spraying Coating Method - Google Patents

Abstract

The present invention relates to a method of manufacturing a diamond and CBN grinding / cutting tool using a spray coating method, and to provide a method for manufacturing a grinding tool having excellent grinding characteristics at a simple and low cost. have.

The present invention comprises the steps of preparing a binder and the abrasive; Mixing the prepared binder and abrasive; Thermally coating the mixed mixture on the target to form a grinding tool on the target surface; And a method for producing a grinding tool comprising the step of separating the grinding tool from the target.

According to the present invention, a grinding tool having excellent grinding characteristics can be provided simply and at low cost.

Thermal spray coating, grinding tools, abrasives, binders, targets

Description

Method for Manufacturing Grinding Tool Using Thermal Spraying Coating Method

The present invention relates to a method for producing diamond and CBN grinding / cutting tools, and more particularly, to a method for manufacturing a grinding tool by using a thermal spraying coating (plasma spray coating).

Recently, materials applied to various fields such as special steel, light alloy, ceramic, etc. are widely used because of their excellent mechanical properties.

However, the cutting and grinding of these materials becomes increasingly difficult, and there is a limit to increasing the precision surface and work efficiency.

On the other hand, the hardest diamond and CBN on the ground is the primary abrasive used in the grinding and cutting applications.

Today diamond and CBN tools are widely used in the grinding of materials such as glass, ceramics, natural stones and light alloys.

For example, diamond particles, which are abrasive in diamond wheels, are placed around the bonding material or on the wheel surface.

Depending on the type of bonding material, grinding tools, for example, diamond wheels, are roughly divided into three types: resin bonded diamond wheels, metal bonded diamond wheels, and vitrified bonded diamond wheels.

The resin bonded diamond wheel is generally used to grind various cements, tungsten carbides, and ceramic high-speed-steel (HSS).

The metal-bonded diamond wheel is mainly used for grinding CRT (Cathode Ray Tube), glass, optical glass, automotive glass, and the like.

The vitrified bonded diamond wheel is mainly used for grinding camshafts, polycrystalline diamond / polycrystalline boron nitride (PCD / PCBN), and the like.

In general, there are three methods for producing diamond and CBN tools: an electro-deposition method, a sintering method, and a fusion method.

However, the production of grinding tools, for example diamond wheels, by these methods is complicated and time consuming.

In particular, in recent years, since the application range is gradually widened according to the change in product size and shape, using the method up to now also costs a lot.

For example, the sintering process is a process of mixing the powder, molding using a mold, sintering, finishing polishing to produce the required shape, and sometimes electric discharge.

Furthermore, if the diamond wheel manufactured by the conventional method is locally broken, not only is it difficult to repair with the same manufacturing method but also costs all costs (transportation and repair periods) incurred for the repair.

Therefore, there is a need for the development of a technology capable of manufacturing a grinding tool such as a diamond wheel having excellent grinding characteristics at a simple and low cost.

An object of the present invention is to provide a method for manufacturing a grinding tool having excellent grinding characteristics with a simple and low cost by manufacturing a grinding tool using a thermal spray coating method.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

The present invention comprises the steps of preparing a binder and the abrasive;

Mixing the binder and the abrasive prepared as above;

Forming a grinding tool on the target surface by thermally spraying the mixed mixture on the target; And it relates to a method of manufacturing a grinding tool using the thermal spray coating method comprising the step of separating the grinding tool from the target.

In addition, the present invention is a method of manufacturing a grinding tool in which an abrasive is bonded to a shank by a binder,

Preparing a binder, abrasive and shank;

Mixing the binder and the abrasive prepared as above; And

It relates to a method for manufacturing a grinding tool using the thermal spray coating method comprising the step of manufacturing a grinding tool by spray coating the mixture as described above to the shank.

In addition, the present invention is a method of manufacturing a grinding tool in which an abrasive is bonded to a shank by a binder,

Preparing a binder, abrasive and shank;

Mixing the binder and the abrasive prepared as above;

Coating a thermal expansion buffer on the surface of the shank; And

It relates to a method of manufacturing a grinding tool using a thermal spraying coating method comprising the step of thermally coating the mixture prepared as described above on the thermal shock-absorbing material coating layer to produce a grinding tool.

According to the present invention, a grinding tool having excellent grinding characteristics can be provided simply and at low cost.

In addition, according to the present invention, it is possible to easily repair when a local breakdown of the grinding tool occurs, and thus it is possible to reduce overall costs related to transportation and repair period required for the repair.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention is a method for manufacturing a grinding tool using the thermal spray coating method.

Here, the grinding tool is used to mean not only the original grinding tool but also the cutting tool and the grinding tool.

The manufacture of the grinding tool by hot spray coating can result in a simple manufacturing process and low manufacturing cost, and the advantage of the thermal spray coating acts as a driving force for the future development.

In general, thermal spray coating has been used as a versatile coating fabrication technique for improving the surface characteristics of metallic components.

The spraying process can be divided into individual processes by energy sources.

The coating of powder is sprayed and transported at high speed by using a gas flow to the target by heat and propulsion.

On the target surface the powder quickly forms an open coating and hardens.

Spraying is a key factor in the formation of a coating layer on the spray rate of the powder in the flame.

1 shows examples of particle temperature ranges according to particle collision rates of various spraying methods.

As shown in FIG. 1, PS (plasma spray), HVOF (high velocity oxide fuel flame spray), D-gun (detonation flame spray), and CS (cold spray) are diamonds on the shank by the maximum impact velocity. It can be used to form a coating of abrasive, such as CBN.

What is important in the present invention is to set the spray coating method and the spray coating conditions that can be produced for the grinding tool using an abrasive such as diamond and CBN.

One example of the present invention is to manufacture a grinding tool without a shank, another example is to manufacture a grinding tool comprising a shank, and another example is to manufacture a grinding tool comprising a shank and having a thermal expansion buffer coating layer on the shank surface. It is.

As shown in FIG. 2, in order to manufacture a grinding tool without a shank according to the present invention, a binder and an abrasive are first prepared, and when a grinding tool including a shank is prepared, a binder, an abrasive and a shank are prepared, and the shank is prepared. In the case of manufacturing a grinding tool including a thermal expansion buffer coating layer on the shank surface, a binder, an abrasive, a thermal expansion buffer and a shank are prepared.

The abrasive is not particularly limited, and preferred examples thereof include diamond, CBN, and the like, among which diamond is most preferred.

In addition, diamond coated with Ti or the like may be used.

The abrasive is not particularly limited, but preferably has a particle size of 1 ~ 500㎛.

The binder is not particularly limited, and representative examples thereof include metal binders including one or two or more selected from the group consisting of Cu, Sn, Co, Cr, W, and Ni, which are generally powder molded and sintered. It is a material used as a bonding material used in the method.

In addition, as the binder, a metal binder as well as a non-lipid binder may be used. As a representative example, Si is a main component, and selected from the group consisting of Al, Mg, Na, Ca, Li, B, Ti, and K elements. The binder containing 1 type or 2 or more types is mentioned.

When the thermal expansion coefficient of the mixed powder of the binder and the abrasive is different from the thermal expansion coefficient of the shank, it is preferable to coat the thermal expansion buffer in consideration of the thermal expansion coefficient between the shank and the mixed powder.

For example, when the material of the shank is made of Cu or a Cu-based alloy, the coating may be directly applied to the surface of the shank. However, when the shank is made of Al, an Al-based alloy, or an iron-based alloy, the intermediate degree of copper and other shank portions on the shank surface may be applied. It is preferable to reduce the impact due to the difference in the coefficient of thermal expansion and to improve the bonding force by finely applying the metal powder of.

The thermal expansion buffer is not particularly limited, and examples thereof include CuSn and NiCr alloys.

The material of the shank is not particularly limited, and representative examples thereof include iron-based, Al or Al-based, Cu or Cu-based.

Next, the binder prepared as described above and the abrasive are mixed.

At this time, the content of the abrasive is not particularly limited, but is preferably limited to 2 to 60 vol%.

If the content of the abrasive is less than 2vol%, there is a problem that the performance as a grinding tool such as diamond and CBN can not be exhibited, and if it exceeds 60vol%, there is a workability problem due to the manufacturing cost and mutual interference between the abrasives. Therefore, the content of the abrasive is preferably limited to 2 ~ 60vol%.

Next, in order to manufacture a grinding tool without a shank, the mixture is sprayed on the target to form a grinding tool on the target surface, and then the grinding tool is separated from the target to produce a soft tool.

In addition, in the case of manufacturing a grinding tool including a shank, the mixture is sprayed on the shank to prepare a soft tool.

In addition, in the case of manufacturing a grinding tool including a shank and having a thermal expansion buffer coating layer on the surface of the shank, the thermal expansion buffer is coated on the shank, and then the mixed mixture is sprayed on the shank to prepare an extension tool.

The gas for plasma generation during the thermal spray coating uses a gas obtained by mixing an inert gas or nitrogen gas with hydrogen gas.

Among the above inert gases, Ar gas is preferable.

The flow rate of the inert gas or nitrogen gas is preferably selected from 20 to 75 Slpm, and the flow rate of hydrogen gas is preferably selected from 1 to 28 Slpm.

The plasma generation current and the voltage are preferably selected from 200 to 600 A and 20 to 60 V, respectively.

The flow rate of the transport gas is preferably set to 1 to 10 Slpm, and the spraying distance is preferably set to 10 to 300 mm.

Spray coating time may vary depending on the thickness of the coating layer to be obtained, such as 30 seconds to 2 hours.

This can shorten the production time compared to the sintering time (minimum 1 hour, cooling time 10 hours or more) by the general powder sintering method.

The preferred spray coating time is about 10-20 minutes,

On the other hand, when the thermal expansion buffer coating layer is formed on the shank surface, the flow rate of the inert gas or the nitrogen gas is preferably set to 25 to 75 Slpm, and the flow rate of the hydrogen gas is preferably set to 1 to 34 Slpm1.

The plasma generation current and the voltage are preferably selected from 300 to 850 A and 30 to 85 V, respectively.

The flow rate of the transport gas is preferably selected to 1 to 10 Slpm.

The spraying distance is preferably selected to 10 ~ 300mm.

The spray coating time is preferably selected at least 1 second to 2 hours depending on the shape and thickness of the tool.

For example, if the size of the coated body is small and the coating can be performed with one spray, it can be produced in at least 10 seconds, and is preferable for manufacturing general grinding wheels 1A1 and 150D-10W-3X. The spray coating time is 10-20 minutes.

The thickness of the abrasive-containing coating layer of the grinding wheel produced according to the present invention is 0.01 to 20 mm.

The grinding tool applied to the present invention is not particularly limited, and typical examples thereof include grinding wheels of various types, multi-shaped grinding cutters, double head grinding wheels, grinding tables, edge wheels, wheels for CMP pads, honing stones, and the like. Tools, various cutting tools, abrasive tools, and the like.

Compared with the conventional method and the conventional method, the present invention using the thermal spray coating method can save 1/5 ~ 1/50 production time compared to the general powder sintering method and is required for the powder sintering method. It also has the advantage of reducing the mold manufacturing cost and eliminating the machining process necessary to separate and remove the mold after sintering.

In addition, when partial repair is required, partial repair is impossible with the manufacturing method by the powder sintering method, while using the present invention, local repair of the partially damaged grinding / cutting tool is possible.

Another advantage is that in the case of a multi-shaped product, the sintering mold cannot be manufactured into a complicated shape. Therefore, the sintering mold can be manufactured in a straight form, and then a shape can be manufactured using a machining process or a tool can only be manufactured in an electrodeposition form. In this case, any complex shape can be coated according to the shape of the shank, and the thickness of the sprayed layer can be easily adjusted from 0.010 to 20mm, and the manufacturing time can be lowered sufficiently than the electrodeposition method, and the environmental problem is solved. Can be.

Hereinafter, the present invention will be described in more detail with reference to Examples.

(Example)

Grinding wheels for glass edge processing were prepared by thermal spray coating as follows.

At this time, as shown in Table 1, the shank used aluminum shank, copper shank, and S45C steel shank, and the binder material was bronze (Cuze) alone having a particle size of 10 μm and a light alloy powder having a particle size of 20 μm ( Co25.5Cr10.5Ni7.5W0.5) was used.

In this case, the hard alloy powder improves the hardness of the diamond coating and also affects the bonding state because of its high wettability.

As the abrasive, diamond having a particle size of 45 μm and diamond coated with Ti were used, respectively.

15 vol.% Of diamond was mixed in the binder using a ball mill, and the mixed powder was thermally sprayed onto the shank for 10 minutes by APS (atmosphere plasma spraying) to obtain a thermal spray coating layer having a thickness of 1 mm.

At this time, Ar gas was used as the transport gas.

On the other hand, except for the Cu-based shank, NiCr thermal expansion buffer coating layer was formed for the aluminum shank and S45C steel shank, this coating layer formation time was about 1 minute, the thickness was about 100㎛.

At this time, the spray coating conditions were as shown in Table 2.

The hardness and abrasion degree of the grinding wheel manufactured as described above were examined, and the results are shown in Table 3 below.

The XRD spectrum of the diamond coating layer of the invention material (1) and the SEM photograph of the surface of the coating layer and the SEM photograph of the cross section of the coating layer were observed among the grinding wheels prepared as described above, and the XRD spectrum results are shown in FIG. 3 and the SEM photograph of the coating layer surface. The results are shown in FIG. 4, and the SEM photograph results of the coating layer cross section are shown in FIG. 5.

In addition, an enlarged view of the diamond identified in FIG. 5 is shown in FIG. 6.

On the other hand, the SEM photograph of the cross section of the coating layer of the invention material 4 in the grinding wheel was observed, and the result is shown in FIG.

Thus, the diamond grinding wheel made by the plasma spray method was evaluated by processing the edge surface of the glass. Plasma spray coated diamond grinding wheels on aluminum shanks were able to grind the edges of the glass.

In addition, as a result of grinding the edge surface of the glass using the invention material (9) of the grinding wheel prepared as described above, it was confirmed that the grinding is possible, and the cross-section and surface photo of the ground glass as a digital image and SEM picture It measured and the result is shown in FIG.

(A) of FIG. 8 is a digital image, (b) shows a SEM photograph.

The part shown in black in FIG. 8 (b) represents diamond particles.

In Table 3 below, the degree of abrasion shows wheel wear when a total of 40 mm was cut in a glass plate of 2 mm thickness x 40 mm length with a cutting amount of 10 μm / pass.

Psalm No. Shank Binder Abrasive Buffer coating layer thickness (㎛) Mix Coating Layer Thickness (㎛) Invention 1 Al shank CuSn Diamond 100 1000 Invention Material 2 Cu shank CuSn Diamond - 1000 Invention 3 S45C Steel Shank CuSn Diamond 100 1000 Invention 4 Al shank CuSn Coated Diamond 100 1000 Invention 5 Cu shank CuSn Coated Diamond - 1000 Invention Material 6 S45C Steel Shank CuSn Coated Diamond 100 1000 Invention Material 7 Al shank CuSn + Hard Alloy Diamond 100 1000 Invention Material 8 S45C Steel Shank CuSn + Hard Alloy Diamond 100 1000 Invention Material 9 Al shank CuSn Diamond 100 1000 Invention Material 10 S45C Steel Shank CuSn Diamond 100 1000 Invention Material 11 Al shank CuSn Diamond 100 1000 Invention Material 12 S45C Steel Shank CuSn Diamond 100 1000

Specimen No.
  Thermal expansion buffer coating layer formation conditions   Diamond-Containing Coating Layer Formation Conditions Ar
flux
(Sl pm) Hydrogen
flux
(Sl
pm) I'm
Liu
(A) I'm
Pressure
(V) transit
Gas (Ar) Flow Rate (Slpm) Warrior
Street
(mm) Spraying time (minutes) Ar
flux
(Sl
pm) Hydrogen
flux
(Sl
pm) I'm
Liu
(A) I'm
Pressure
(V) transit
Gas (Ar)
Flow rate (Slpm) Warrior
Street
(mm) Champion time
(minute) Invention 1 50 2 400 46 2.5 120 One 55 2 400 37 4 120 10 Invention 2 - - - - - - - 55 2 400 37 4 100 10 Invention 3 50 2 400 46 2.5 120 One 55 2 400 37 4 100 10 Invention 4 50 8 500 46 3 120 One 55 2 400 46 4 120 10 Invention 5 - - - - - - - 55 2 400 46 4 100 10 Invention 6 50 8 500 46 3 120 One 55 2 400 46 4 100 10 Invention Material7 50 6 650 55 3 120 One 55 2 500 55 4 90 10 Invention Material 8 50 6 650 55 3 120 One 55 2 500 46 4 90 10 Invention Material 9 50 8 500 55 3 120 One 55 2 500 55 4 90 10 Invention 10 50 8 500 55 3 120 One 55 2 400 46 4 80 10 Invention Material 11 50 8 500 55 3 120 One 55 2 600 64 4 100 10 Invention Material12 50 8 500 55 3 120 One 55 2 600 64 4 80 10

Psalm No. Hardness  Wear Invention 1 55.7 0.9387 Invention Material 2 67.3 0.6438 Invention 3 70.5 0.5135 Invention 4 82.6 0.3284 Invention 5 91.2 0.2167 Invention Material 6 85.4 0.2849 Invention Material 7 104.3 0.0815 Invention Material 8 101.5 0.1124 Invention Material 9 88.5 0.1012 Invention Material 10 92.7 0.05 Invention Material 11 80.5 0.1413 Invention Material12 75.6 0.1997

As shown in Table 3, in the case of the invention material (1-12) according to the present invention, it can be seen that the hardness and the degree of wear required by the polishing tool.

As shown in FIG. 3, the coating layer of the grinding wheel includes a bronze (CuSn) phase. It can be seen that some CuO was found.

This indicates that even a small amount of oxidation occurs during thermal spraying, but this copper oxidation is very fine and does not affect the performance of the grinding wheel.

As shown in Figure 4, it can be seen that the diamond particles are cleanly present and are bound on the binder.

5 and 6, it can be seen that the bonding layer (NiCr) between Al shank and the mixed powder has no obvious interface with the coating layer including diamond.

This indicates that two materials with significantly different coefficients of thermal expansion react with each other by coating a first bonding layer on Al shank and then a mixed powder layer, and the plasma spray coating bonds well.

In addition, it can be seen that the plasma-spray diamond coating layer is considerably dense and the porosity is less than 2 Vol%.

Therefore, it is easy to identify the diamond particles in the plasma spray coating layer, and it can be seen from the SEM photograph that the diamond is uniformly distributed in the mixed powder.

As shown in FIG. 7, when Ti-coated diamond particles are used, sharp edges of the thermally sprayed diamond particles are preserved.

This seems to be because the Ti layer coated on the diamond effectively prevents the diamond from being corroded by heat (heat graphitization and oxidation).

Therefore, since diamond has a good crystal surface and sharp edges, the grinding performance of the grinding wheel is also excellent.

In the case of using Ti coated diamond particles, it is also helpful to increase the bonding strength between the diamond particles and the metal powder used as the bond.

As shown in FIG. 8, it can be seen that after grinding the glass, grinding traces are formed on the glass surface, and the metal bonding layer is worn flat.

In addition, it can be seen that the diamond particles located in the center of the worn face are raised several micrometers on the worn face.

In general, the metal binder must wear away in front of the diamond particles, ie the cavity (a few micrometers deep), and the diamond height of the wear surface is much smaller than the average size of the diamond particles (40-50 μm), and the exposed diamond particles are strongly ground. It adheres to the metal bond of the wheel, allowing the surface of the workpiece to be removed during grinding.

1 is a schematic diagram showing examples of particle temperature ranges according to particle collision rates of various spraying methods.

2 is a process flowchart showing an example of a method for manufacturing a grinding tool using the spray coating method according to the present invention.

3 is an XRD spectrum of a diamond coating layer of a grinding wheel (invention material 1) in accordance with the present invention.

Figure 4 is a SEM photograph of the surface of the diamond coating layer of the grinding wheel (invention material 1) in accordance with the present invention

5 is a SEM photograph of a cross section of a diamond coating layer of a grinding wheel (invention material 1) according to the present invention.

6 is an enlarged photograph of the diamond shown in FIG.

7 is a SEM photograph of a cross section of a diamond coating layer of a grinding wheel (invention material 4) according to the present invention.

8 shows the grinding of glass ground using a grinding wheel (invention material 9) in accordance with the present invention.

Digital images and SEM photographs respectively showing the processed surface and the cross section, wherein (a) shows the digital image and (b) shows the SEM photograph.

Claims (50)

Preparing at least one abrasive selected from the group consisting of a binder and diamond coated with CBN and Ti on the surface; Mixing 2 to 60 vol% of the abrasive and 40 to 98 vol% of the binder prepared as described above; Forming a grinding tool on the target surface by thermally spraying the mixed mixture on the target; And separating the grinding tool from the target, In the spray coating, a plasma generation gas is used as a gas in which hydrogen gas having a flow rate of 1 to 28 Slpm is mixed with an inert gas or nitrogen gas having a flow rate of 20 to 75 Slpm, and a plasma generating current and voltage are 200 to 600 A and 20 to 60 V, respectively. The flow rate of the transport gas is 1 ~ 10Slpm, the spraying distance is 10 ~ 300mm, and the spray coating time is 1 second ~ 2 hours manufacturing method of the grinding tool using the spray coating method delete The method of manufacturing a grinding tool using the thermal spray coating method according to claim 1, wherein the abrasive has a size of 1 to 500 µm. The binder according to claim 1 or 3, wherein the binder is a metal binder comprising one or two or more selected from the group consisting of Cu, Sn, Co, Cr, W and Ni, or based on Si, wherein Method for producing a grinding tool using a thermal spray coating method characterized in that the bit-liquid binder containing one or two or more selected from the group consisting of Al, Mg, Na, Ca, Li, B, Ti and K elements delete delete delete delete delete delete In the manufacturing method of the grinding tool in which the abrasive is bonded to the shank by a binder, Preparing one abrasive and shank selected from the group consisting of a binder, diamond, CBN and Ti coated on the surface thereof; Mixing 2 to 60 vol% of the abrasive and 40 to 98 vol% of the binder prepared as described above; And And thermally coating the mixed mixture as described above to produce a grinding tool. In the spray coating, a plasma generation gas is used as a gas in which hydrogen gas having a flow rate of 1 to 28 Slpm is mixed with an inert gas or nitrogen gas having a flow rate of 20 to 75 Slpm, and a plasma generating current and voltage are 200 to 600 A and 20 to 60 V, respectively. The flow rate of the transport gas is 1 ~ 10Slpm, the spraying distance is 10 ~ 300mm, and the spray coating time is 1 second ~ 2 hours manufacturing method of the grinding tool using the spray coating method delete The method of manufacturing a grinding tool using the thermal spray coating method according to claim 11, wherein the abrasive has a size of 1 to 500 µm. The binder according to claim 11 or 13, wherein the binder is a metal binder comprising one or two or more selected from the group consisting of Cu, Sn, Co, Cr, W, and Ni, or based on Si, wherein Method for producing a grinding tool using a thermal spray coating method characterized in that the bit-liquid binder containing one or two or more selected from the group consisting of Al, Mg, Na, Ca, Li, B, Ti and K elements delete delete The method for manufacturing a grinding tool using the thermal spray coating method according to claim 11 or 13, wherein the shank is one selected from the group consisting of iron, Al, Al, Cu, and Cu. 15. The method of manufacturing a grinding tool using the thermal spray coating method according to claim 14, wherein the shank is one selected from the group consisting of iron, Al, Al, Cu and Cu. delete delete delete delete delete delete delete delete The grinding tool according to claim 11 or 13, wherein the grinding tool is one selected from the group consisting of a grinding wheel, a multi-shaped grinding cutter, a double head grinding wheel, a grinding table, an edge wheel, a CMP pad wheel, and a honing stone. Method for manufacturing a grinding tool using a thermal spray coating method 15. The thermal spray coating according to claim 14, wherein the grinding tool is one selected from the group consisting of a grinding wheel, a multi-shaped grinding cutter, a double head grinding wheel, a grinding table, an edge wheel, a CMP pad wheel, and a honing stone. Method of manufacturing grinding tools using the method 18. The thermal spray coating according to claim 17, wherein the grinding tool is one selected from the group consisting of a grinding wheel, a multi-shaped grinding cutter, a double head grinding wheel, a grinding table, an edge wheel, a CMP pad wheel, and a honing stone. Method of manufacturing grinding tools using the method In the manufacturing method of the grinding tool in which the abrasive is bonded to the shank by a binder, Preparing one abrasive and shank selected from the group consisting of a binder, diamond, CBN and Ti coated on the surface thereof; Mixing 2 to 60 vol% of the abrasive and 40 to 98 vol% of the binder prepared as described above; Coating a thermal expansion buffer on the surface of the shank; And And thermally coating the mixture prepared as above on the thermal expansion buffer coating layer to prepare a grinding tool. In the spray coating, a plasma generation gas is used as a gas in which hydrogen gas having a flow rate of 1 to 28 Slpm is mixed with an inert gas or nitrogen gas having a flow rate of 20 to 75 Slpm, and a plasma generating current and voltage are 200 to 600 A and 20 to 60 V, respectively. The flow rate of the transport gas is 1 ~ 10Slpm, the spraying distance is 10 ~ 300mm, and the spray coating time is 1 second ~ 2 hours manufacturing method of the grinding tool using the spray coating method delete The method of manufacturing a grinding tool using the thermal spray coating method according to claim 30, wherein the abrasive has a size of 1 to 500 µm. The binder according to claim 30 or 32, wherein the binder is a metal binder comprising one or two or more selected from the group consisting of Cu, Sn, Co, Cr, W, and Ni, or based on Si, wherein Method for producing a grinding tool using a thermal spray coating method characterized in that the bit-liquid binder containing one or two or more selected from the group consisting of Al, Mg, Na, Ca, Li, B, Ti and K elements delete delete 33. The method for manufacturing a grinding tool according to claim 30 or 32, wherein the shank is one selected from the group consisting of iron, Al, and Al. 34. The method of claim 33, wherein the shank is one selected from the group consisting of iron, Al, and Al. delete delete delete delete delete delete delete delete 33. The grinding tool according to claim 30 or 32, wherein the grinding tool is one selected from the group consisting of a grinding wheel, a multi-shaped grinding cutter, a double head grinding wheel, a grinding table, an edge wheel, a CMP pad wheel, and a honing stone. Method for manufacturing a grinding tool using a thermal spray coating method 35. The thermal spray coating according to claim 33, wherein the grinding tool is one selected from the group consisting of a grinding wheel, a multi-shaped grinding cutter, a double head grinding wheel, a grinding table, an edge wheel, a CMP pad wheel, and a honing stone. Method of manufacturing grinding tools using the method 37. The thermal spray coating according to claim 36, wherein the grinding tool is one selected from the group consisting of a grinding wheel, a multi-shaped grinding cutter, a double head grinding wheel, a grinding table, an edge wheel, a CMP pad wheel, and a honing stone. Method of manufacturing grinding tools using the method 38. The thermal spray coating according to claim 37, wherein the grinding tool is one selected from the group consisting of a grinding wheel, a multi-shaped grinding cutter, a double head grinding wheel, a grinding table, an edge wheel, a CMP pad wheel, and a honing stone. Method of manufacturing grinding tools using the method 19. The thermal spray coating according to claim 18, wherein the grinding tool is one selected from the group consisting of a grinding wheel, a multi-shaped grinding cutter, a double head grinding wheel, a grinding table, an edge wheel, a CMP pad wheel, and a honing stone. Method of manufacturing grinding tools using the method

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