KR20200077239A - Metal powder for manufacturing carbide spacer and method for manufacturing carbide spacer comprising thereof - Google Patents

Abstract

The present invention relates to metal powder for manufacturing a carbide spacer and a method for manufacturing a carbide spacer including the same. The present invention includes the steps of manufacturing a ring shape, forming a coupling hole, and forming the carbide spacer.

Description

Metal powder for manufacturing cemented carbide spacer and method for manufacturing cemented carbide spacer comprising the same (metal powder for manufacturing carbide spacer and method for manufacturing carbide spacer comprising thereof)

The present invention relates to a metal powder for manufacturing a cemented carbide spacer and a method for manufacturing a cemented carbide spacer comprising the same, and more particularly, to a metal powder for manufacturing a cemented carbide spacer comprising tungsten carbide powder and cobalt powder, and a method for manufacturing a cemented carbide spacer comprising the same.

Excavators are a kind of heavy equipment used in construction and civil engineering sites, and are widely used for crushing strong ground such as rocks or excavating the ground to spread work objects such as soil.

The excavator includes an excavator body provided with a transport unit and a cab, an excavator arm coupled to the excavator body to rotate, and a bucket having a gourd shape provided at an end of the excavator arm to contain a work object such as soil. The bucket is coupled to a removable end of the excavator arm.

When connecting a bucket (not shown) to the excavator arm 1 of FIG. 1, the spacer 5 having the coupling hole 6 formed must be connected to the fastening hole 2 of the excavator arm 1 and the bolt 7. To this end, a bolt hole is formed in each of the excavator arm 1 and the spacer 5.

The spacer 5 may form part of the excavator arm 1 as described above, but is also used as a bushing for preventing wear of the excavator arm 1 corresponding to the movement of the bucket. However, due to the nature of the excavator used in a place where there is a large amount of foreign matter, foreign matter can penetrate between the excavator arm (1), spacer (5), and the bucket, causing abnormal wear and play, and even if there is no foreign matter, the movement of the bucket Therefore, the sliding part is worn and the bucket may operate abnormally. According to the existing technology (Korea Patent Registration No. 10-0956998) to solve such a problem, the spacer is formed of a cemented carbide welding film directly on the carbon steel body in order to form a cemented carbide layer on an iron-based base material, thereby separately separating the abrasion resistant portion of the cemented carbide material. It is proposed to manufacture a spacer by a powder powdering process that does not require a process such as casting and sintering for manufacturing, and does not require a silver lead process requiring skill.

However, this known technique has limitations such as non-uniformity of powder distribution during powder powdering process and relying on manual work during manufacturing. Therefore, the present invention is intended to present a cemented carbide spacer by a PTA (Plasma Transferred Arc) process that is simpler and more automated than the existing technology, and the manufacturing of the cemented carbide spacer using the PTA process is simple while the manufacturing process is performed, but is performed by a cemented carbide overcoat. It has excellent wear resistance and uniform wear properties.

Korean Registered Patent No. 10-0956998

In order to solve the above-mentioned problems, the present invention is a simple process of forming an abrasion-resistant portion on the sliding portion of the cemented carbide spacer, and it is easy to combine the cemented carbide spacer, but has a metal powder for manufacturing a cemented carbide spacer having excellent wear resistance and a cemented carbide comprising the same Provides a spacer manufacturing method.

In order to solve the above-mentioned problem, the present invention according to the first aspect is a cemented carbide spacer for plasma transfered arc (PTA) cultivation welding including 85 to 95 parts by weight of tungsten carbide powder and 5 to 15 parts by weight of cobalt powder. A metal powder for production is provided.

The present invention according to the second aspect comprises the steps of (i) preparing an integral ring shape of carbon steel; (ii) forming a coupling hole for fixing with the excavator arm on one surface of the ring shape; And (iii) a cemented carbide spacer through plasma transfer arc (PTA) cultivation welding using the metal powder of any one of claims 1 or 2 as a spray material between coupling holes formed on one surface of the ring shape. It provides a method of manufacturing a cemented carbide spacer comprising the step of forming.

The present invention according to the third aspect provides a carbide spacer for mounting an excavator arm manufactured by the above manufacturing method.

In the method of manufacturing a cemented carbide spacer according to the present invention, a cemented carbide nurturing welding film is directly formed on the carbon steel body, so that processes such as casting and sintering for separately manufacturing abrasion resistant parts of a cemented carbide material are unnecessary, and a silver soldering process requiring skill is not required. This is not only to eliminate the quality non-uniformity that may occur during the joining process, but is also more advantageous for automation.

In addition, the cemented carbide spacer manufactured according to the method for manufacturing a cemented carbide spacer according to the present invention has a simple manufacturing process, and has excellent wear resistance and uniform abrasion characteristics by a cemented carbide overcoat.

1 is an exploded perspective view showing a cemented carbide spacer connected to an excavator arm according to an embodiment of the present invention.
Figure 2 schematically shows the structure of the torch portion of the plasma transfer arc welding machine used in an embodiment of the present invention.
3 is an enlarged view of a metal powder in which tungsten carbide (WC) powder and cobalt (Co)-based binder powder used in an embodiment of the present invention are mixed.
Figure 4 shows the results of the wear resistance test according to an embodiment of the present invention.
Figure 5 shows the Rockwell hardness test results according to an embodiment of the present invention.
FIG. 6 is a photograph of a cemented carbide spacer after plasma-transferred arc cultivation welding according to an embodiment of the present invention. (a) shows a picture after completion of a PTA operation, (b) shows a surface after polishing, and (c) shows a picture after surface treatment. will be.
7 is an enlarged photograph of the change of the cemented carbide particles in the current supply amount according to an embodiment of the present invention.
Figure 8 is a photograph of the interfacial structure of the cemented carbide spacer according to an embodiment of the present invention, (a) is a tungsten carbide and cobalt particles are preserved form and the underlying tissue photo, (b) is an interfacial photograph of a cemented carbide spacer formed by PTA method , ① is an enlarged SEM photograph of tungsten carbide and cobalt particles in (a), ② is a base tissue photograph in (a), and ③ is an enlarged SEM photograph of the interface in (b).
9 is a photograph of actually applying a cemented carbide spacer according to an embodiment of the present invention to an excavator arm.
10 is a reversing prevention screw holder 30 for preventing loosening of a bolt 7 fixed to a cemented carbide spacer 5 and an excavator arm 1.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the description of the present invention, when it is determined that a detailed description of related known technologies may obscure the subject matter of the present invention, the detailed description will be omitted. Throughout the specification, when a part “includes” a certain component, this means that other components may be further included rather than excluding other components, unless specifically stated to the contrary.

The present invention can be applied to various transformations and can have various embodiments, and thus, specific embodiments will be illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present invention, terms such as include or have are intended to designate the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features, numbers, or steps. It should be understood that it does not preclude the existence or addition possibility of the operation, components, parts or combinations thereof.

<Metal powder for manufacturing cemented carbide spacers>

The present invention according to the first aspect provides a metal powder for manufacturing a cemented carbide spacer for Plasma Transferred Arc (PTA) cultivation welding comprising tungsten carbide powder and cobalt powder.

The tungsten carbide has a very high strength and is used in the production of machine tools, armored shells for tanks, ballpoint pens, and the like. However, tungsten carbide has a high brittleness and a very high melting point, so it is almost impossible to manufacture it in a certain shape through direct casting or forging. Therefore, it is used by sintering cobalt or nickel as a substrate.

The tungsten carbide may have a purity of 99% by weight or more. When the purity of tungsten carbide is less than 99% by weight, the strength of the cemented carbide spacer to which the metal powder is applied may be lowered.

The tungsten carbide powder may have a particle size (FSSS) of 2 to 4 μm and an apparent density of 3.3 to 3.8 g/cm 3. When the particle size and the apparent density are out of the above-described range, the strength of the cemented carbide spacer to which the metal powder is applied may be lowered.

The content of the tungsten carbide powder may be 85 to 95 parts by weight based on 100 parts by weight of the metal powder for manufacturing a cemented carbide spacer. If the content of tungsten carbide is less than 85 parts by weight, the hardness of the spacer may be lowered, and if it exceeds 95 parts by weight, the hardness is satisfactory, but due to the high brittleness of tungsten carbide, the spacer may easily break or cracks due to stress may occur during cooling. In addition, the surface of the grown weld bead may be rough, resulting in excessive surface processing cost.

The cobalt powder is melted to form a matrix, and may include tungsten carbide powder inside the matrix.

The cobalt powder may have a particle size (FSSS) of 1.0 to 1.5 μm and an apparent density of 7.0 to 12.0 g/cm 3. When the particle size and apparent density of the cobalt powder are out of the above-described range, the strength of the cemented carbide spacer to which the metal powder is applied may be lowered.

The content of the cobalt powder may be 5 to 15 parts by weight based on 100 parts by weight of the metal powder for preparing a cemented carbide spacer. If the content of the cobalt powder is less than 5 parts by weight, matrix formation is difficult, and the dispersibility of the tungsten carbide powder may be lowered. If it exceeds 15 parts by weight, hardness and abrasion resistance may be reduced.

The metal powder including the tungsten carbide powder and cobalt powder may have a powder particle size (FSSS) of 45 to 150 μm, a flow rate (50 g) of 8.5 to 12.0 sec, and an apparent density of 6.0 to 7.5 g/cm 3.

<Carbide spacer manufacturing method>

The present invention according to the second aspect

(i) preparing an integral ring shape of carbon steel;

(ii) forming a coupling hole for fixing with the excavator arm on one surface of the ring shape; And

(iii) forming a cemented carbide spacer through plasma transfer arc (PTA) foster welding by using the metal powder for manufacturing the cemented carbide spacer as a thermal spray material between coupling holes formed on one surface of the ring shape Provides a spacer manufacturing method.

The cemented carbide spacer may be formed by repeatedly performing a plasma-transferred arc (PTA) growth welding process one or more times so that a desired film thickness is formed. In addition, a further uniform thickness can be formed by mechanically polishing the growth welding film after the growth welding process.

As an example, the plasma transfer arc (Plasma Transferred Arc: PTA) foster welding may be performed at a working current of 110 to 150 A. The amount of current supplied from the plasma shift arc welding is a major factor that determines the amount of plasma generated and the temperature of the welding. When the working current is less than 110 A, the melting of cobalt powder is not smooth, and thus separation of tungsten carbide and cobalt powder may occur. When a current exceeding 150 A is supplied, tungsten carbide particles may melt or reprecipitate, resulting in lower strength. have.

<Carbide spacer for mounting excavator arm>

The present invention according to the third aspect provides a carbide spacer for mounting an excavator arm manufactured by the method for manufacturing a carbide spacer.

The carbide spacer for mounting an excavator arm manufactured by the method of manufacturing the carbide spacer is based on 100 parts by weight of the carbide spacer, 20 to 30 parts by weight of tungsten, 4 to 6 parts by weight of cobalt, 5 to 15 parts by weight of carbon and 50 of iron It may be to include 70 parts by weight.

The cemented carbide spacer 5 connects the bucket to the hole 4 formed in the excavator arm to couple the bucket to the excavator arm 1, and a hole is formed in the center to connect the excavator arm 1 and the bucket. It is in the form of a disc, and 2 to 10 engaging holes 6 for being fixedly fixed to the excavator arm 1 may be provided at regular intervals on the exposed surface of the spacer.

1 is an exploded perspective view of a cemented carbide spacer and an excavator arm according to an embodiment of the present invention.

The cemented carbide spacer 5 according to an embodiment of the present invention is in the form of a ring integrally made of carbon steel, and can be manufactured through a casting process and additional machining. The sliding portion of the carbon steel cemented carbide spacer 5, which requires a high level of hardness and abrasion resistance, is provided with abrasion resistance by forming a plasma-transferred arc-producing welding film using a metal powder having excellent durability as a filler.

In the excavator arm 1, a hole 4 is formed to seat the cemented carbide spacer 5, and a plurality of fastening holes 2 are formed radially in the hole 4, and in the center of the hole 4 The pin insertion portion 3 is formed.

The cemented carbide spacer 5 is seated in the hole 4 formed in the excavator arm 1 and is formed in a disk-shaped ring shape with a central portion pierced therein, and a plurality of couplings so as to face the fastening holes 2 around it. Holes 6 are formed.

A bolt 7 is fastened to the engaging hole 6 of the cemented carbide spacer 5 and the fastening hole 2 of the excavator arm 1.

The carbide spacer for mounting the excavator arm of the present invention will be described with reference to FIG. 1 as follows.

The cemented carbide spacer according to an embodiment of the present invention may be manufactured in a disc shape, and a hole for connecting the excavator arm 1 and the bucket may be provided at the center portion. In addition, the excavator arm 1 may be provided with two carbide spacers 5 on both sides. A pin insertion portion 3 is formed in the excavator arm 1, and the excavator arm 1 and the bucket can be fixed with pins (see FIG. 9). In addition, the cemented carbide spacer 5 may be composed of a non-exposed surface that is a part in contact with the excavator arm and an exposed surface that is a part in contact with the bucket, and 2 to 10 pieces are preferable on the exposed surface to be securely fixed to the excavator arm. Preferably 4 to 8, more preferably 6 engaging holes 6 may be provided at regular intervals. When the number of the coupling holes is less than two, the fixing of the cemented carbide spacer 5 may not be smooth, and thus may be detached during operation. When more than ten coupling holes are provided, the area of the spacer excluding the coupling hole 6 is reduced, and thus the cemented carbide spacer The strength of can drop.

The exposed surface of the spacer may be formed through a plasma transfer red arc (PTA) growth welding process between the coupling holes using the metal powder.

During the plasma transfer arc-growth welding process, the cemented carbide powder is transferred to a plasma torch in an inert gas atmosphere and melted while being ejected directly into the arc and melt-bonded to the surface of the base material. Plasma shift arc growth welding is advantageous in that it is easy to synthesize carbide powder, can form a relatively thick growth welding coating, has low cost, high heat input, high welding efficiency, and easy workability.

At this time, when forming a welding film by plasma transfer arc nurturing welding, in order to achieve a smoothness of the welding film surface and to prevent cracks in the welding interface, the welding film is subjected to one welding transfer process to the target surface of the base material. It is preferably formed. However, two or more types of nursing welding films may be stacked or used, or a plasma-transfer arc nurturing welding may be repeatedly performed two or more times when a thick welding film is required.

In one example, the thickness of the welding film formed by the plasma transfer arc-growth welding may be 0.5 to 6 mm. When the thickness of the welding film is less than 0.5 mm, the wear resistance life may be reduced, and when it exceeds 6 mm, the durability and ease of welding process of the welding film may be reduced.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described to be easily carried out by those of ordinary skill in the art. In addition, in the description of the present invention, when it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, certain features shown in the drawings are enlarged or reduced or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

<Example 1-2 and Comparative Example 1-5>

Example 1

Metal powder was prepared by mixing tungsten carbide powder 88% by weight with a purity of 99% by weight and 12% by weight of cobalt powder.

The metal powder was formed on a processed ring-shaped cemented carbide spacer base made of SM45C by using a plasma transfer arc growth method to form a growth welding film with a thickness of 5 mm on the sliding surface of the sliding portion. At this time, the working current was performed at 120 A. After forming a nurturing welding film, a cemented carbide spacer was produced through plane polishing.

Example 2

It was carried out in the same manner as in Example 1, except that the working current was used as 140 A.

Comparative Example 1

In Example 1, a tungsten carbide was used in the same manner, except that 60 wt% cobalt powder and 40 wt% were used, and the working current was 110 A.

Comparative Example 2

In Comparative Example 1, the same operation was performed except that the working current was used as 140 A.

Comparative Example 3

In Example 1, the same operation was performed except that 100 A was used.

Comparative Example 4

It was carried out in the same manner as in Example 1 except that the working current was used as 160 A.

Comparative Example 5

In Example 1, the same operation was performed except that 180 A was used.

<Physical property evaluation-Experimental Example 1-4>

Experimental Example 1

Using the cemented carbide spacers prepared in Examples 1-2 and Comparative Examples 1-2, a wear resistance test was performed in the manner shown in ASTM G65-B.

<ASTM G65-B>

The surface of the cemented carbide spacer prepared according to Examples 1-2 and Comparative Examples 1-2 was brought into contact with a rotating rubber wheel (RPM: 200, surface pressure: 130N), and then sand (US SILICA (AFS 50/70) )) to form a scratch on the surface of the cemented carbide spacer for 10 minutes.

The weight of the cemented carbide spacer before scratch formation and the weight of the cemented carbide spacer after scratch formation were measured, respectively, and the wear amount of the cemented carbide spacer was measured.

Before experiment (g) After experiment (g) Deviation Amount of wear (mm ³ ) Example 1 212.0873 212.0454 0.0419 4.48 Example 2 217.0936 217.0191 0.0745 7.96 Comparative Example 1 212.8780 212.6289 0.2491 25.87 Comparative Example 2 212.8011 212.4261 0.3750 38.94

As shown in Table 1 and 4, when using a metal powder containing a tungsten carbide powder and cobalt powder according to the present invention, and performing a plasma transfer arc-growth welding under 110 to 150 A working current to form a cemented carbide spacer , It was confirmed that the wear resistance is excellent.

Experimental Example 2

Rockwell hardness was specified using the cemented carbide spacers prepared in Examples 1-2 and Comparative Examples 1-2. The specificity of Rockwell hardness was performed using DTR-200N of Daekyung Tech, and it was measured by calculating the average value of 5 times minus the minimum and maximum values after each 7 measurements using the finished surface specimen.

One 2 3 4 5 Average Example 1 83.7 84.4 83.7 83.5 84.6 84.18 Example 2 81.8 82.6 81.7 81.1 83.1 82.03 Comparative Example 1 83.0 82.8 83.0 82.1 83.4 82.86 Comparative Example 2 79.2 79.7 79.6 80.1 79.2 79.56

As shown in Table 2 and Fig. 5, when using a metal powder containing tungsten carbide powder and cobalt powder according to the present invention, and performing a plasma transfer arc-growth welding under a working current of 110 to 150 A to form a cemented carbide spacer , It was confirmed that the hardness is excellent. Particularly, when the working current of the plasma shifting arc nurturing welding was set to 120 A (Example 1), it was confirmed that the hardness was the best.

Experimental Example 3

Cross-sectional tissues were measured using the cemented carbide spacers prepared in Example 1 and Comparative Examples 3-5. As shown in FIG. 7, in the case of Comparative Example 3 in which current was supplied at 100 A, a phenomenon in which the matrix part produced by cobalt powder and tungsten carbide were separated, and Comparative Example 4-5 in which current was supplied at 160 A or more. In the case of, it was confirmed that a chemical change such as melting or reprecipitation of tungsten carbide occurs due to high heat.

Experimental Example 4

The composition ratio of the cemented carbide spacer prepared according to Example 1 was investigated. Table 3 shows the measured composition ratio.

ingredient Example 1 (% by weight) tungsten 25.1 cobalt 4.9 carbon 10.1 iron 59.9 Sum 100

As shown in Table 3, the composition ratio of the cemented carbide spacer was confirmed to be higher in the content of carbon and iron than the composition ratio of the metal powder. This is the result of the bonding with the base iron by the plasma transfer arc cultivation method, the content of iron is increased, it is judged that the content of carbon is increased by the mixed carbon dioxide. Through this, it was confirmed that the metal powder according to the present invention is strongly bonded to the base by a plasma shifting arc-growing method. In addition, as shown in FIG. 8, in the case of using an appropriate plasma transfer arc cultivation welding method (b, ②, ③ in FIG. 8), tungsten carbide and cobalt particles are evenly distributed in the base layer melted at the interface with iron, and particle growth It was confirmed that the suppressed tungsten carbide has high hardness and wear resistance.

10 is a reversing prevention screw holder 30 for preventing loosening of a bolt 7 fixed to a cemented carbide spacer 5 and an excavator arm 1. The reversing prevention screw receiving portion 30 is coupled to the lower portion of the bolt head to prevent loosening of the bolt 7 and is composed of an upper reversing preventing screw receiving portion 31 and a lower reversing preventing screw receiving portion 34.

The upper reversing prevention screw receiving 31 is formed on the upper surface of the upper tooth 32 which is in contact with the bottom surface of the head of the bolt 7, and the lower surface of the lower cam surface at an angle greater than the thread inclination angle of the bolt 7 on the lower surface ( 33) is provided with a structure formed, the lower reversing prevention screw receiving 34 is formed with a lower tooth 35 on the lower surface, the upper surface so as to engage the lower cam surface 33 of the upper reversing prevention screw receiving (31) The upper cam surface 36 having an angle greater than the thread inclination angle of the bolt 7 is provided in a structure.

Therefore, the lower teeth 35 of the lower reversing prevention screw receiving 34 are in close contact with the upper fixing plate 21, and successively, the upper reversing preventing screw receiving 31 is stacked on the lower reversing preventing screw receiving 34. After the upper cam surface 36 of the reverse reversing prevention screw 34 and the lower cam surface 33 of the upper reversing prevention screw receiving 31 are meshed with each other, the bolt 7 is then subjected to the upper reversing prevention screw receiving 31. And the lower reversal prevention screw receiver 34 and the mounting surface.

Accordingly, the upper teeth 32 of the upper reversing prevention screw receiving 31 are in close contact with the bottom surface of the head of the bolt 7, so that the bolt 7 can be prevented from being loosened, and eventually the upper portion of the stopper 20. The fixing plate 21 is firmly mounted on the ground.

On the other hand, the outer surface of the cemented carbide spacer 5 may be coated with an antifouling coating layer made of an antifouling coating composition to effectively achieve prevention and removal of contaminants.

The anti-pollution coating composition contains an alkylate polyglucoside and an aminoalkyl slovetaine in a molar ratio of 1:0.01 to 1:2, and the total content of the alkylate polyglucoside and the aminoalkyl slovetaine is 1 to 10 relative to the total aqueous solution. Weight percent.

The alkylate polyglucoside and aminoalkyl slovetaine are preferably 1:0.01 to 1:2 as the molar ratio, and when the molar ratio is outside the above range, the coating property of the substrate is lowered or the moisture absorption on the surface after application is increased to remove the coating film. There is a problem.

The alkylate polyglucoside and aminoalkyl slobtaine are preferably 1 to 10% by weight in the total composition aqueous solution, and if it is less than 1% by weight, there is a problem that the coatability of the substrate decreases, and when it exceeds 10% by weight, the thickness of the coating film increases. Crystal precipitation is likely to occur.

On the other hand, it is preferable to apply the composition for prevention of contamination onto the substrate by a spray method. In addition, the thickness of the final coating film on the substrate is preferably 500 to 2000 mm 2, more preferably 1000 to 2000 mm 2. If the thickness of the coating film is less than 500Å, there is a problem that deterioration occurs in the case of high temperature heat treatment, and if it exceeds 2000Å, there is a disadvantage that crystal precipitation on the coating surface tends to occur.

In addition, the present anti-pollution coating composition can be prepared by adding 0.1 mol of alkylate polyglucoside and 0.05 mol of aminoalkyl slovetaine to 1000 ml of distilled water and then stirring.

Since the specific parts of the present invention have been described in detail above, it will be apparent to those of ordinary skill in the art that these specific techniques are only preferred embodiments, and the scope of the present invention is not limited thereby. will be. Accordingly, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

1: Excavator arm 2: Fastening hole
3: Pin insertion portion 4: Hole portion
5: Carbide spacer 6: Coupling hole
7: Bolt

Claims (5)

Metal powder for manufacturing cemented carbide spacer for plasma transfer arc (PTA) cultivation welding, comprising 85 to 95 parts by weight of tungsten carbide powder and 5 to 15 parts by weight of cobalt powder. The plasma transfer arc (Plasma) of claim 1, wherein the metal powder has a powder particle size (FSSS) of 45 to 150 μm, a flow rate (50 g) of 8.5 to 12.0 sec, and an apparent density of 6.0 to 7.5 g/cm ³ . Transferred Arc:PTA) Metal powder for manufacturing cemented carbide spacers for growth welding. Method of manufacturing a cemented carbide spacer comprising the following steps:
(i) preparing an integral ring shape of carbon steel;
(ii) forming a coupling hole for fixing with the excavator arm on one surface of the ring shape; And
(iii) The metal powder of any one of claims 1 or 2 is used as a thermal spray material between the coupling holes formed on one surface of the ring shape, and a plasma transferred arc at a working current of 110 to 150 A :PTA) Forming a cemented carbide spacer through nurturing welding. It is manufactured by the manufacturing method according to claim 3,
Carbide spacer for mounting an excavator arm comprising 20 to 30 parts by weight of tungsten, 4 to 6 parts by weight of cobalt, 5 to 15 parts by weight of carbon, and 50 to 70 parts by weight of iron, based on 100 parts by weight of cemented carbide spacer. According to claim 4,
In the excavator arm 1, a hole 4 is formed to seat the cemented carbide spacer 5, and a plurality of fastening holes 2 are formed radially in the hole 4, and in the center of the hole 4 A pin insertion portion 3 is formed;
The cemented carbide spacer 5 is seated in the hole 4 formed in the excavator arm 1 and is formed in a disk-shaped ring shape with a central portion pierced therein, and a plurality of couplings so as to face the fastening holes 2 around it. A hole 6 is formed;
Carbide spacer for mounting an excavator arm, characterized in that a bolt 7 is fastened to the coupling hole 6 of the cemented carbide spacer 5 and the coupling hole 2 of the excavator arm 1.

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