JP5544407B2 - Gouging carbon - Google Patents

Description

  The present invention relates to gouging carbon applied to arc grooving, and more particularly to gouging carbon using aluminum or an aluminum alloy as a main conductive material instead of copper plating.

  Gouging carbon currently on the market uses electroplated copper as the main conductive material for gouging carbon. Please refer to FIG. 1, but the existing gouging carbon is a combination of the copper plate 11 and the carbon rod 10 surface. By electroplating, a copper plating layer 12 is formed, and the electric resistance of the electrode rod is lowered to conduct a large current necessary for generating an arc. However, the smoke generated when copper is burned at high temperature is harmful to the human body.

  In addition, the existing copper electroplating process generates a large amount of copper ion-containing wastewater, and the electroplating generates acid gas, which causes heavy metal contamination of water quality, soil and air, so corresponding environmental protection equipment However, the environmental protection awareness is increasing day by day, resulting in an increase in manufacturing costs.

The existing copper electroplating method has the disadvantages that harm the human body, and the aluminum material cannot be bonded to the carbon rod by the electroplating method. After spray coating on the surface, it is further remelted at the melting temperature, and the consumed energy is very large, which is very inconvenient in use.
As a result, a kind of aluminum gouging carbon has been developed. It uses a thermal spraying method to coat the carbon rod surface with an aluminum material and then sinter it below the metal melting point. However, the existing thermal sprayed aluminum material has a small amount that can cover the surface of the carbon rod, often forms a waste of material, and the aluminum material is easily oxidized and the adhesion between the metal to be coated is not The electric resistance is low and the electric resistance is high, the electrode rod is consumed quickly, the service life is shortened, and since it is necessary to sinter again, the energy is consumed and the economy is inferior.

  However, due to the difficulties mentioned above due to the use of aluminum as a conductive material, one person researched and developed the use of an extrusion molding method. According to it, artificial graphite was the main material around the periphery of conductive metal. And kneading and forming a binder (coal tar, bitumen) and sintering in an inert environment at a temperature below the metal melting point. However, the sintering of the existing carbon rod electrode needs to reach a high temperature of 1000 degrees Celsius or higher, so that it becomes higher than the melting point of aluminum and most metals. On the other hand, when the sintering is performed at a low temperature, the electric resistance of the carbon rod is increased, and the cost for sintering conditions in an inert environment filled with an inert gas is high and continuous production cannot be performed.

  In addition, some people have researched and developed a method of sintering after inserting the metal rod into the carbon rod at a temperature below the metal melting point. There is a problem of poor adhesion.

  Existing gouging carbon has many of the above-mentioned drawbacks, and therefore the existing gouging carbon manufacturing method and structure need to be improved.

  The main object of the present invention is to provide a gouging carbon using aluminum or an aluminum alloy as a main conductive material instead of electroplated copper, and injecting it into a carbon rod in a molten state, so that aluminum in existing technology can be used. An object of the present invention is to reduce the energy consumption required for thermal spraying and bonding with a carbon rod, and to improve the problems that the amount of metal ejection during thermal spraying is small and the uniformity of the thickness of the coating layer is difficult to control.

  The main objectives of the present invention are to avoid the effects that form on the human body and the environment of contamination such as strong light, noise and metal dust generated during the existing thermal spraying process, as well as shorten the production time of metal spraying, It is to reduce the metal consumption and greatly reduce the manufacturing cost.

In order to achieve the above object, the present invention is formed by bonding aluminum or an aluminum alloy to a carbon rod unit.

  The above-mentioned carbon rod unit has an elongated main body, and a central portion is formed so as to penetrate the center of the above-mentioned main body, and the above-mentioned central portion forms a first opening end at the first end of the main body. And extended toward the second end of the body to form a second open end.

The above-mentioned aluminum or aluminum alloy is melted into a liquid state and injected into the central portion from the second opening end of the above-mentioned carbon rod unit using pressure, and after the above-mentioned aluminum or aluminum alloy is cooled and solidified, A covering cover section is formed at the center of the body, and the second open end of the body projects outwardly to form an exposed section.

Among them, the electrical resistance of the above-mentioned gouging carbon is 0.1 to 1.0 mΩ · cm . The length of the exposed section is 2-4 mm.

  In the carbon rod unit of the present invention, artificial graphite, petroleum coke, carbon black and a binder are mixed, molded with an extruder, and fired at a high temperature of 1000 ° C. or more.

The above carbon rod unit has a density of 1.76 to 1.84 g / cm ³ and a structural strength of 500 to 850 kgf / cm ² .

And the pure aluminum content of the above-mentioned aluminum or aluminum alloy must be 80 wt% or more.

The weight percentage of the above-mentioned aluminum or aluminum alloy is 10 to 40% of the total gouging carbon.

A feature of the present invention is that aluminum or an aluminum alloy is injected under pressure into the central portion of the carbon rod in a molten state to reduce the energy consumption required for thermal spraying of existing aluminum and bonding with the carbon rod. The problem is that it is possible to improve the problem that the adhesion amount of the metal ejection is small and the uniformity of the coating layer thickness is difficult to control.

  In addition, it avoids the effects of strong light, noise, and contamination such as metal dust on the human body and environment in the pressure injection process of subsequent applications, and shortens the manufacturing time for combining aluminum and carbon rods. Reduce metal consumption and drastically reduce manufacturing costs.

It is a display figure of the copper electroplating of the surface of the existing carbon rod. It is a three-dimensional view of the gouging carbon of the present invention. FIG. 3 is a cross-sectional view of FIG. 2. FIG. 4 is an exploded view of FIG. 3. It is a display figure of pressure injection to the carbon rod unit of aluminum or aluminum alloy of the present invention. It is a display figure of the application to the arc grooving process of the gouging carbon of this invention.

  In order to describe in detail the technical contents, structural features, and objects to be achieved of the present invention, examples will be described below in combination with the drawings.

Please refer to FIG. 2 to FIG. In a preferred embodiment, the gouging carbon 20 of the present invention is comprised of two parts, a carbon rod unit 21 and aluminum or aluminum alloy 22.

  The carbon rod unit 21 includes a long circular main body 211, and a cylindrical central portion 212 is formed so as to penetrate the center of the main body 211. The central portion 212 is a first portion of the main body 211. A first opening end 213 that communicates with the outside is formed at the end (ie, the front end), and a second opening end 214 that communicates with the outside is formed at the second end (ie, the rear end) of the main body 211 described above.

The above-described aluminum or aluminum alloy 22 is injected into the central portion 212 from the second opening end 214 of the above-described carbon rod unit 21 in a molten liquid state using pressure, and the above-described aluminum or aluminum alloy 22 is cooled and solidified. Then, a cylindrical covering cover section 221 corresponding to the cylindrical shape of the central portion 212 is formed at the central portion 212 of the main body 211, and is exposed outwardly from the second opening end 214 of the main body 211. The section 222 is formed, the outer diameter of the exposed section 222 is aligned with the outer diameter of the carbon rod unit 21 and the length of the exposed section 222 is 2 to 4 mm. The above-described carbon rod unit 21 is prevented from being damaged.

  The carbon rod unit 21 of the present invention is a mixture of artificial graphite, petroleum coke, carbon black and a binder, and is molded by an extruder and fired at a high temperature of 1000 degrees Celsius or higher. The density and structural strength of the material have been increased.

The density of the carbon rod unit 21 described above is 1.76 to 1.84 g / cm ³ and the structural strength is 500 to 850 kgf / cm ² , so that when the aluminum or aluminum alloy 22 is injected into the central portion 212. It can withstand the pressure of

The aluminum or aluminum alloy 22 of the present invention is pressurized and injected into the central portion 212 of the carbon rod unit 21 in a molten state, thereby closely bonding the metal and the carbon rod.

And the pure aluminum content of the above-mentioned aluminum or aluminum alloy 22 should be 80 wt% or more, thereby preventing the harmful environment of the harmful metals and the human body.

The weight percentage of the above-described aluminum or aluminum alloy 22 is 10 to 40% of the total gouging carbon 20, and can thereby conduct a large current necessary for arc discharge.

Please refer to FIG. When manufacturing the gouging carbon 20 of the present invention, the above-described carbon rod unit 21 is placed in the production space 31 formed by the two-part combined alloy mold 30, and the outside of the combined alloy mold 30 is connected to the press-fit piston 32. The molten aluminum or aluminum alloy 22 is injected into the carbon rod unit 21 placed in the combined alloy mold 30 described above.

Molten aluminum or aluminum alloy 22 is combined with the carbon rod unit 21 and then cooled to form the covered cover section 221 and the exposed section 222 described above.

Thus, the gouging carbon 20 having a resistance value of 0.1 to 1.0 mΩ · cm and good conductivity can be formed.

The performance of the gouging carbon 20 produced according to the present invention is superior to that of the current products produced by the thermal spraying method, and the performance was compared as follows based on the degree of wear.

In addition, the gouging carbon 20 produced in accordance with the present invention is consistent with the current operating use applied in the table below and does not generate a red hot phenomenon.

  See FIG. When the gouging carbon 20 of the present invention is applied to carbon rod arc grooving, an arc is generated between the carbon rod unit 21 and the metal material 40 (iron, cast iron), and the metal is melted by the high heat of the arc. At the same time, the molten metal is removed from the gouging torch 41 by the high-pressure air ejected along the carbon rod unit 21 to form a groove in the metal material or cut the metal.

Taken together, the present invention is, energy consumption is less necessary when aluminum or in an aluminum alloy is melted to a liquid, low manufacturing cost than the existing system, a high economic effect, and in a manner of injecting with a pressure, aluminum or An aluminum alloy can be made into a highly dense metal layer, and there are few metal oxides.

  In addition, it can prevent the effects of pollution caused by strong light, noise and metal dust generated during the existing thermal spraying process on the human body and the environment, and can shorten the manufacturing process time for combining aluminum and carbon rods, thereby reducing metal consumption. Manufacturing costs can be greatly reduced.

  The above description is only an example of the present invention, and does not limit the scope of the present invention. Any equivalent changes and modifications that can be made based on the scope of the claims of the present invention are all described in the present invention. Shall belong to the scope covered by the rights.

DESCRIPTION OF SYMBOLS 10 Carbon rod 11 Copper plate 12 Copper plating layer 20 Gouging carbon 21 Carbon rod unit 211 Main body 212 Central part 213 1st opening end 214 2nd opening end 22 Aluminum or aluminum alloy 221 Cover cover section 222 Exposed section 30 Combined alloy type 31 Production space 32 Press-fit piston 40 Metal 41 Gouging torch

Claims (8)

In gouging carbon,
A carbon rod unit having a long main body and having a central portion penetrating the center of the main body, the central portion forming a first opening end at a first end of the main body. , As well as the carbon rod unit extending toward the second end of the body to form a second open end;
Aluminum or an aluminum alloy , which is melted to be in a liquid state and is injected into the above-mentioned central portion from the second opening end of the above-mentioned carbon rod unit using pressure, and the above-mentioned aluminum or aluminum alloy is cooled and solidified. And forming the covering cover section in the center of the main body, and the aluminum or aluminum alloy , the second open end of the main body protruding outward to form an exposed section;
Gouging carbon, characterized in that   2. The gouging carbon according to claim 1, wherein the carbon rod unit is formed by mixing artificial graphite, petroleum coke, carbon black, and a binder, and molding with an extruder and firing at a high temperature of 1000 degrees Celsius or more. Gouging carbon. The gouging carbon according to claim 1, wherein the carbon rod unit has a density of 1.76 to 1.84 g / cm ³ . In gouging carbon according to claim 1, the structural strength of the aforementioned carbon rod unit, characterized in that it is a 500~850kgf / cm ^2, gouging carbon. The gouging carbon according to claim 1, wherein the pure aluminum content of the aluminum or aluminum alloy must be 80 wt% or more. The gouging carbon according to claim 1, wherein the weight percentage of the aluminum or aluminum alloy is 10 to 40% of the total gouging carbon. The gouging carbon according to claim 1, wherein the electric resistance of the gouging carbon is 0.1 to 1.0 mΩ · cm .   The gouging carbon according to claim 1, wherein the length of the exposed section is 2 to 4 mm.

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