JPS6350080Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrode rod for oxygen arc cutting that performs cutting work by supplying oxygen and generating an arc.

[Conventional technology]

Conventionally, as shown in the cross-sectional view of FIG. 6, an electrode rod for oxygen arc cutting mainly consists of a tube body 51 such as a steel tube with an oxygen flow hole 50 formed in the axial direction in the center. A flux layer 52 is coated on the surface, and a film layer 53 is further provided on the outer periphery.

Various materials are adopted as the material for the tube body 51, and the tube body 51 may have a double tube structure or a double tube structure so that an optimal arc shape can be obtained by adjusting the diameter ratio of the oxygen flow hole 50 and the tube body 51. It is constructed so as to satisfy the usage conditions by adopting a multi-tube structure or by changing the composition and thickness of the flux layer 52.

[Problem that the invention attempts to solve]

However, when the pipe body 51 is made of metal such as steel pipe, it is quite heavy in the case of long lengths and may limit workability, which increases costs in the logistics process and requires too much weight for cutting. Requires effort. In addition, since combustion is caused by the heat of the oxidation reaction of iron,
Although it is possible to improve the cutting speed, the rod wears out too quickly and must be replaced frequently during work. Further, when carbon is used as the material for the tube body 51, the oxidation reaction of carbon is slower than that of iron, so the degree of wear of the rod can be reduced, but it is prone to breakage. Furthermore,
It requires equipment that generates a high current, and the cutting speed is slower than steel pipe cutting rods, so it cannot be used for non-ferrous metals.

As described above, depending on the material of the tube body 51, there is a problem in that the material is consumed during combustion and it is not possible to obtain an appropriate arc shape, which may impede the cutting operation or waste electricity and labor. .

The purpose of this invention is to make efficient cutting work possible by taking advantage of the respective strengths of electrode rods that are mainly made of tubular bodies such as steel pipes, and electrode rods that are mainly made of carbon, and by compensating for their respective drawbacks. The purpose is to

[Means and actions for solving problems]

The present invention is an electrode rod for oxygen arc cutting that has an oxygen flow hole in the shaft core and has a coating layer disposed on the outermost layer to have at least a three-layer structure. The weight of the electrode rod is reduced by using a metal tube and a carbonized layer between the metal tube and the oxygen flow hole to protect the carbonized material from external pressure and utilize the heat of oxidation reaction in the metal tube. This improves cutting efficiency by increasing the combustibility of carbonized materials.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a perspective view of an electrode rod for oxygen arc cutting according to the present invention, and FIG. 2 is a sectional view thereof.

In the figure, 1 is a metal inner tube with an oxygen flow hole 2 penetrated in the axial direction, and its material is a steel tube, aluminum tube, stainless steel tube, or copper tube treated with chrome plating and colorizing.
Ceramic coating layers 3 and 4 are formed on the inner and outer circumferential surfaces of the metal inner tube 1, respectively.
Note that the ceramic coating layers 3 and 4 may be further subjected to a colorizing process, and there is no problem in use even if the ceramic coating layers 3 and 4 and the colorizing process are not provided.

Furthermore, materials such as urea resin, plastic, paper, wood, bamboo, etc. can be used to form the oxygen flow holes 2.

5 is a carbonized layer formed around the metal inner tube 1;
As the material, electrode materials normally used for blasting and gouging can be used. Furthermore, artificial graphite can be used for direct current so that it can be used in water, or graphite with silicon added can be used for alternating current so that it can be used in the atmosphere.

Reference numeral 6 denotes a metal tube formed around the outer periphery of the carbonized layer 5, and its material is a steel tube, an aluminum tube, a stainless steel tube, or a copper tube that has been chromed and colorized. In addition to this metal tube 6, urea resin, plastic, paper,
Wood, bamboo, etc. can be used.

Reference numeral 7 denotes a flux layer provided around the outer periphery of the metal tube 6 by winding coated cellulose paper or the like.

This flux layer 7 is made of talc, red iron, calcium lime, titanium (rutile) kneaded with sodium silicate and impregnated with paper, cellulose wood powder, cellulose human silk, rutile, asbestos, manganese dioxide. , talc, mica, wheat flour, and calcium carbonate are kneaded with sodium silicate, and cellulose paper is impregnated with the mixture. Furthermore, the underwater flux layer 7 can be made of lime titania, or made of vinyl-based flammable and water-resistant synthetic resin, making it possible to work underwater by taking advantage of its water resistance. It can be done.

The metal tube 6 is used as an intermediate layer and the flux layer 7 is used as an outer layer to constitute a coating layer A of the carbonized layer 5.

In the above configuration, since the carbonized layer 5 with good electrical conductivity and combustibility is arranged around the metal inner tube 1,
The fusing work can be performed reliably.

By the way, in actual work, the inner carbonized layer 5
is several mm smaller than the outer layer metal tube 6 and flux layer 7.
An arc is generated from the tip of the carbonized layer 5 by starting with the carbonized layer 5 protruding to a certain extent. The purpose of this is to concentrate the arc and encourage arc generation at low current. If the tips of the electrode rods are aligned, more current will flow through the metal tube 6, and the electrode rods will be attracted to and welded to the object to be cut without generating an arc.

On the other hand, in the electrode rod of the present invention, if the carbonized layer 5 with the oxygen flow holes 2 is made to protrude, oxygen is supplied at the same time as the arc, thereby improving combustion of the electrode rod and cutting into the object to be cut. It is possible to start the That is, because the flux layer 7 and the metal tube 6 always burn several mm ahead of the carbonized layer 5 due to the difference in melting point, the cutting process can proceed while maintaining a stable arc.

Here, if the carbonized layer 5 is made too thick, an excessive amount of current is required, so the diameter of this carbonized layer 5 is
If the diameter is 8.5 mm or more, copper plating may be applied, paper or cellulose paper may be further wound around the outer periphery, and the metal tube 6 may be closely disposed around the outermost periphery. In this case, the outer periphery of the metal tube 6 is covered with cellulose paper, and as described above, talc, red iron oxide,
Since the flux layer 7 containing calcium lime and titanium kneaded with sodium silicate is formed, the work can be performed without requiring excessive electric power, and the combustion is extremely good.

Furthermore, since it has a carbonized structure made of carbon or the like, which is lighter in weight than the conventional one mainly made of metal tubes, it is lightweight, and the work effort can be reduced. Further, since the life of the electrode rod can be extended within the range of allowable weight and possible supply current, loss time due to replacement can be reduced, and workability can be improved.

In addition to the above, the carbonaceous layer 5, which does not generate an arc unless the current is several hundred to 1000A, is covered with a metal tube 6, so that an appropriate arc is formed even with a low current.
If the thickness is less than 11mm, an appropriate arc can be obtained with a low current of about 150 to 250A, and because the current is so low, almost no resistance heat is generated. This prevents the electrode rod from exploding due to heat and oxygen, allowing for safe operation.

Here, the structure of the electrode rod shown in FIGS. 1 and 2 can be modified in various other ways, and elements for this modification include the following.

(1) Presence or absence of the metal inner tube 1 forming the oxygen flow hole 2.

(2) Make the metal tube 6 a multiple tube.

(3) Select the material of the metal tube 6 arbitrarily.

(4) When the 6 parts of the metal pipe are multi-pipe, it is a combination of different types of metal pipes.

In Figure 3, the metal inner tube 1 that forms the oxygen flow hole 2 is removed, and the outer metal tube 6 has a multi-tube structure, which satisfies the conditions (1) and (2) above. It is something.

If condition (3) is added to this, the metal tube 6 can be selected to be optimal for combustion, and if condition (4) is added, it can be replaced with multiple tubes made of different metals.

Here, in the electrode rod for oxygen arc cutting, it is already known that the shape of the generated arc changes depending on the relative relationship between the diameter d of the oxygen flow hole 2 and the outer diameter D of the metal tube 6 including the flux layer 7. Are known.

As shown in Figure 4, the most ideal shape of the arc F is to taper toward the tip so that the entire arc F is concentrated.To achieve this, the inner surface of the consumable area 20 at the tip of the electrode rod should be shaped into a parabolic shape. Or it needs to be an ellipsoidal surface.

Experiments have shown that in order to satisfy the shape conditions of the consumable portion 20, D:d may be set in the range of 3:1 to 4:1.

In addition, when the diameter d of the oxygen flow hole 2 is larger than 3 mm, a required number of small diameter metal wires 10 are inserted into the oxygen flow hole 2 as shown in FIGS. The ratio of the cross-sectional area S of the wall thickness to the total cross-sectional area s of the inserted metal wire 10 is S:s=1:
If it is 1.5 to 3, the optimal wear point 2 as shown above
It was confirmed through experiments that the shape of 0 was obtained.

FIG. 5a shows a structure in which five metal wires 10 are inscribed in the inner periphery of the ceramic coating layer 3 and are arranged in contact with each other, so that the oxygen flowing inside the oxygen distribution hole 2 is made to flow uniformly to prevent unbalanced combustion. This is a configuration that can prevent this.

Figure b shows one more metal wire 10 than in case a, and similarly the ceramic coating layer 3 is
The metal wires 10 are arranged so as to be inscribed in the inner periphery of the metal wire 10 and in contact with each other.

Figure c shows a configuration in which metal wires 10 are densely arranged on the entire inner circumference of the ceramic coating layer 3
In this case, in order to satisfy the relationship between the cross-sectional area of the metal inner tube 1 and the total cross-sectional area of the metal wire 10, the diameter of the metal wire 10 is made smaller than in cases a and b.

Figure d shows a configuration in which the metal wires 10 have a larger diameter and are arranged in a dense manner, and Figure e shows a configuration in which oxygen flow pipes 2a are attached to the inner periphery of a plurality of metal wires 10 arranged in the circumferential direction. It is.

By changing the number of metal wires 10 and the ratio to the cross-sectional area of the oxygen flow holes 2,
The amount of oxygen supplied can also be easily adjusted.

[Effect of idea]

As explained above, the electrode rod for oxygen arc cutting of the present invention has a structure with a lightweight carbonized layer, which improves workability and reduces transportation costs, and is less affected by its own weight. The length of the electrode rod can also be increased within the allowable current range.
Furthermore, by providing the carbonized layer, the overall amount of wear is reduced and the shape of the generated arc can be optimized, allowing efficient cutting work.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of the electrode rod according to the present invention, Fig. 2 is a cross-sectional view of the same, Fig. 3 is a cross-sectional view of another embodiment, and Fig. 4 is the tip of the electrode rod. FIG. 5 is a cross-sectional view showing a state in which an arc occurs, FIG. 5 is a cross-sectional view when a metal wire is inserted into the oxygen flow hole, and FIG. 6 is a cross-sectional view of a conventional structure. 1...Metal inner tube, 2...Oxygen distribution hole, 3, 4...
...ceramic coating layer, 5...carbonized layer,
6...Metal tube, 7...Flux layer.

Claims (1)

[Scope of utility model registration request] In an electrode rod for oxygen arc cutting, which has an oxygen flow hole in the shaft core and has at least a three-layer structure with a film layer disposed on the outermost part, the outer layer of the film layer is a flux layer, and the middle layer is a metal tube. An electrode rod for oxygen arc cutting, characterized in that a carbonized layer is provided between the metal tube and the oxygen flow hole.