JP2000197967A - Gas fusion cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas fusion cutting capable of easily adjusting a supply quantity, as a result, improving welding workability and using an iron wire which is conventionally waste-disposed as a scrap. SOLUTION: In a gas fusion cutting method in which cutting oxygen, preheating oxygen, and fuel gas for preheating are injected through a nozzle 13 arranged to the tip part of a cutting torch 12 and an object 15 to be cut is cut, an iron wire 20 made of many twisted wires is supplied in front of a gas injection part of the cutting nozzle, the object 15 to be cut is cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an object to be cut which is difficult to cut by a normal gas cutting method (for example, a special steel which forms an oxide having a high melting point such as an extremely thick steel or stainless steel, and a slag is partially formed). Attached metal, general scrap, non-ferrous metals, etc.)
For cutting gas using a preheating fuel gas and oxygen.

[0002]

2. Description of the Related Art An oxygen fusing method, which is a flame fusing method, is conventionally known as a main fusing method for metals. This oxygen fusing method is used only for steel or low chromium alloy steel forming an oxide having a low melting point, for example, in the case of a high chromium alloy forming an oxide having a high melting point, or in the case of a specially thick steel material, Powder fusing is used as a powerful fusing method. In the powder fusing method, iron powder is put into a cutting oxygen stream, and the iron powder burns violently with a preheating flame and cutting oxygen to generate high temperature and heat. The molten iron powder is melted and accelerated by the kinetic energy of the cutting oxygen, collides with the object to be cut, and is removed from the cut portion. As a method of introducing the iron powder into the cutting oxygen gas stream, a method in which the iron powder stored in the powder feeder is guided to the cutting torch by compressed air or the like and directly put into the cutting oxygen gas stream, or the cutting oxygen gas stream from outside the preheating flame There is a way to put it inside. The amount of iron powder to be supplied must be adjusted according to the material and cutting thickness of the cutting object, the type and gas flow rate of cutting oxygen and preheating fuel gas used, and the structure of the blow pipe and crater used. There is.

[0003]

However, the conventional powder fusing method has the following problems to be solved. That is, since a large amount of high-purity iron powder is used for the iron powder, the fusing cost has risen. In addition, the adjustment of the supply amount of iron powder is affected by the pressure and supply amount of compressed air and the like, and the size, length, and bending of the supply pipe for iron powder and compressed air. The adjustment was difficult, and as a result, the fusing workability was poor. On the other hand, a large amount of steel wire is used in cargo handling operations such as cranes, and when this wire is used for a certain period of time, it is discarded as scrap and used as an iron source, but it is effectively used for other purposes. At present it was not used. The present invention has been made in view of such circumstances, and it is easy to adjust the supply amount, and as a result, the fusing workability is improved, and further, it is possible to use iron wire that has been conventionally discarded as scrap. It is an object to provide a gas fusing method.

[0004]

According to the present invention, there is provided a gas blowing method comprising the steps of: ejecting cutting oxygen, preheating oxygen, and preheating fuel gas through a crater provided at a tip of a cutting torch; In the gas fusing method for cutting an object to be cut, an iron wire composed of a large number of stranded wires is supplied in front of a gas ejection portion of a cutting torch to cut the object to be cut. Therefore, a large number of stranded wires constituting the iron wire exhibit the same action as the iron powder of the conventional powder fusing method, so that the object to be cut can be reliably cut. Here, by using a used steel wire as the iron wire, it is possible to effectively use the used steel wire. Further, by using the metal to be cut as a metal in a melting furnace of an ironworks, it is possible to reliably cut metal in a slag-covered metal.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a schematic configuration diagram of a gas fusing apparatus to which a gas fusing method according to an embodiment of the present invention is applied. As shown in FIG. 1, a gas fusing apparatus 10 to which a gas fusing method according to an embodiment of the present invention is applied is mounted on a traveling carriage 11 that can move in the front-back, left-right directions. A guide (not shown) is fixed on the traveling vehicle 11, and an advance / retreat frame (not shown) that can advance / retreat along the guide is attached. A cutting torch 12 is provided on the advance / retreat frame, and a crater 13 is provided at the tip of the cutting torch 12.
Is installed.

[0006] In the upstream portion of the cutting torch 12 (upper side in the figure), cutting oxygen is passed through a blow pipe 14 and a crater 13 toward a special steel 15 (for example, having a thickness of 1500 mm) which is an example of an object to be cut. For cutting oxygen, preheating oxygen, and fuel gas for preheating by cutting out the extra-thick special steel 15 by squirting preheating oxygen and fuel gas for preheating, and blowing pipe 14 and crater 1
Connection fittings 16 for supplying and discharging cooling water for cooling
7, 18 are provided. Connection fittings 16, 17, 18
Are connected to the corresponding fittings (not shown),
It is connected to a supply source or a discharge destination via a pipe or a hose.

A wire supply means 21 for supplying a steel wire 20, which is an example of an iron wire composed of a large number of stranded wires, is provided on the traveling carriage 11 in front of the gas ejection portion 19 of the cutting torch 12. ing. The diameter of the steel wire 20 is, for example, 9 to 26 mm (more preferably, 16 to 26 mm).
~ 22mm), wire rope type is 6 × 19,6
× 24, 6 × 37, etc. can be used.

[0008] Cutting torch 1 provided on the reciprocating frame
In the vicinity of 2, a fixed guide 22 that moves integrally with the cutting torch 12 and guides the supplied steel wire 20 to the front of the gas ejection portion 19 is attached. Fixed guide 22
Is formed in a pipe shape so that the steel wire 20 can pass therethrough. A wire 23 on which a steel wire 20 is wound is mounted on the traveling vehicle 11, and the steel wire 20 is rewound from the wire 23 and supplied to the front of the gas ejection portion 19 via a fixed guide 22. A supply mechanism 24 is provided. The wire supply mechanism 24 has upper and lower supply rollers 25 and 26 that are driven across a steel wire 20 by a drive source such as a motor (not shown).
A drive source such as a motor has a structure capable of controlling the supply speed of the steel wire 20. The wire aryl 23 is constantly urged in a direction of winding up the steel wire 20 by using an urging means separately.

On the traveling carriage 11, a wire guide mechanism 27 capable of guiding the steel wire 20 in accordance with the advance / retreat operation of the advance / retreat frame (that is, the cutting torch 12 and the fixed guide 22) is provided. As shown in the figure, the wire guide mechanism 27 includes a plurality of pipe-shaped moving guides 28 through which the steel wire 20 passes, a hanging wire 29 capable of hanging the moving guide 28, and a plurality of hanging wires 29. The upper hoop section 30 includes a guide rail 31 made of a slidable steel wire, and a chain 32 that is an example of a flexible material that connects adjacent moving guides 28. In the wire guide mechanism 27 shown in FIG. 1, the fixed guide 22, that is, the cutting torch 12 is in a state where it is at the forward limit. However, as shown in FIG.
Fixed on top. The wire supply means 21 includes a wire array 23, a wire supply mechanism 24, and a wire guide mechanism 27.

Next, a gas fusing method according to an embodiment of the present invention will be described using a gas fusing apparatus 10. The advance / retreat frame of the gas fusing device 10 is arranged at the retreat limit, and the wire supply mechanism 24 of the wire supply means 21 is arranged such that the tip of the steel wire 20 is in front of the gas ejection portion 19.
Is driven and adjusted. The traveling carriage 11 on which the gas fusing device 10 is mounted is moved back and forth, left and right, and the positioning of the cutting torch 12 with respect to the extra-thick special steel 15, that is, the positioning of the cutting start position is performed.

Next, the blowing pipe 14 and the crater 13 are cooled by cooling water.
While cutting, the cutting oxygen, the preheating oxygen, and the fuel gas for preheating are blown out through the blowing pipe 14 and the crater 13 to start cutting the extra-thick special steel 15. The steel wire 20 burns violently by the preheating flame and the cutting oxygen by the preheating oxygen and the preheating fuel gas to generate high temperature and heat. At this time, since the steel wire 20 is composed of a large number of stranded wires, it is easily melted, and the extra-thick special steel 15 is melted by utilizing the high temperature and high heat, and the steel wire 20 is melted by the kinetic energy of the cutting oxygen. Is accelerated, and can be cut by colliding with the extra-thick special steel 15.

As the gas fusing progresses in the thickness direction of the fixed extra-large special steel 15, the steel wire 20 that is damaged by the gas melting is advanced.
So that the tip of is always in front of the gas ejection part 19,
The steel wire 20 is supplied via the wire supply mechanism 24. At this time, the supply speed of the steel wire 20 is controlled in consideration of the material and thickness of the extra-thick special steel 15 and supply conditions of cutting oxygen, preheating oxygen, preheating fuel gas, and the like. further,
As the gas fusing proceeds in the length direction of the extra-thick special steel 15, the advance / retreat frame is advanced, and the cutting torch 12 and the fixed guide 22 are advanced.
4 so that the tip of the eroded steel wire 20 is always in front of the gas ejection portion 19.
Control the supply of At this time, the moving guide 2 attached via the chain 32 according to the advance of the fixed guide 22
Since the wire 8 moves along the guide rail 31, the steel wire 20 is reliably guided by the fixed guide 22.

In the above manner, when the gas cutting of the extra-thick special steel 15 is completed, the supply of the cutting oxygen, the preheating oxygen, and the fuel gas for preheating is stopped, and the wire supply mechanism 24 is moved while the advance / retreat frame is retracted. , The steel wire 20 is wound around the wire aryl 23, and the advance / retreat frame is moved to the retreat limit. Thereafter, the connection of the cutting oxygen, the preheating oxygen, and the fuel gas for preheating is released to complete all the operations.

Therefore, in the gas fusing method according to one embodiment of the present invention, the same effect as in the case where the steel wire 20 composed of many stranded wires is made of iron powder (powder fusing method) is exhibited. The required gas fusing effect can be obtained. Although a new steel wire 20 can be used, it is very economical because a used steel wire used for a crane or the like can be used. Also,
Since the steel wire 20 has a predetermined diameter of, for example, 9 to 26 mm, the supply of the steel wire 20, particularly the control of the supply speed, is extremely simple and reliable.

In the above-described embodiment, the special steel 15 to be cut has been described as an object to be cut. However, the present invention is not limited to this, and metal, scrap, and the like generated in a melting furnace of an ironworks can be used. In particular, in the case of ingots, since slag adheres to the surface, the gas fusing method of the present embodiment, which exhibits the same action as the powder fusing method, is extremely effective. The cutting torch 12 and the fixed guide 22 were mounted on the traveling vehicle 11 via an advance / retreat frame and moved forward and backward. However, if necessary, the cutting torch 12 and the fixed guide 22 were directly mounted on the traveling vehicle, and the fusing position was determined by moving the traveling vehicle back and forth or right and left. Can also be changed. In this case, the wire guide mechanism 27 becomes unnecessary. Further, although the cutting torch 12 and the wire supply means 21 are arranged on the traveling carriage 11, the cutting torch 12 and the wire supply means 21 can be mounted on different traveling carriages and controlled separately. As the preheating fuel gas, acetylene gas, propane gas, LPG (liquefied petroleum gas) or the like can be used.

[0016]

According to the gas fusing method of the present invention, an iron wire composed of a large number of stranded wires is supplied in front of a gas ejection portion of a cutting torch to cut an object to be cut. Therefore, a large number of stranded wires constituting the iron wire can perform the same operation as the iron powder in the conventional powder fusing method, and can surely cut the object to be cut. Is easily adjusted, and as a result, fusing workability is improved. In particular, in the gas fusing method according to the second aspect, by using the used steel wire for the iron wire, it is possible to effectively use the steel wire that has been conventionally discarded as scrap, and it is economical. is there. In the gas fusing method according to claim 3,
By using the metal to be cut as the metal of the melting furnace of the steel mill, the metal covered with the slag can be reliably cut, and the fusing workability is further improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a gas fusing method according to an embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 gas fusing device 11 traveling trolley 12 cutting torch 13 crater 14 blowpipe 15 extra-thick special steel (object to be cut) 16 connection fitting 17 connection fitting 18 connection fitting 19 gas ejection section 20 steel wire (iron wire) 21 wire supply means 22 Fixed guide 23 Wire aryl 24 Wire supply mechanism 25 Supply roller 26 Supply roller 27 Wire guide mechanism 28 Moving guide 28a Moving guide 29 Hanging wire 30 Hoop section 31 Guide rail 32 Chain (flexible member)

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[Procedure amendment]

[Submission date] November 30, 1999 (1999.11.
30)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Gas blowing method

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an object to be cut which is difficult to cut by a normal gas cutting method (for example, a special steel which forms an oxide having a high melting point such as an extremely thick steel or stainless steel, and a slag is partially formed). Attached metal, general scrap, non-ferrous metals, etc.)
For cutting gas using a preheating fuel gas and oxygen.

[0002]

2. Description of the Related Art An oxygen fusing method, which is a flame fusing method, is conventionally known as a main fusing method for metals. This oxygen fusing method is used only for steel or low chromium alloy steel forming an oxide having a low melting point, for example, in the case of a high chromium alloy forming an oxide having a high melting point, or in the case of a specially thick steel material, Powder fusing is used as a powerful fusing method. In the powder fusing method, iron powder is put into a cutting oxygen stream, and the iron powder burns violently with a preheating flame and cutting oxygen to generate high temperature and heat. The molten iron powder is melted and accelerated by the kinetic energy of the cutting oxygen, collides with the object to be cut, and is removed from the cut portion. As a method of introducing the iron powder into the cutting oxygen gas stream, a method in which the iron powder stored in the powder feeder is guided to the cutting torch by compressed air or the like and directly put into the cutting oxygen gas stream, or the cutting oxygen gas stream from outside the preheating flame There is a way to put it inside. The amount of iron powder to be supplied must be adjusted according to the material and cutting thickness of the cutting object, the type and gas flow rate of cutting oxygen and preheating fuel gas used, and the structure of the blow pipe and crater used. There is.

[0003]

However, the conventional powder fusing method has the following problems to be solved. That is, since a large amount of high-purity iron powder is used for the iron powder, the fusing cost has risen. In addition, the adjustment of the supply amount of iron powder is affected by the pressure and supply amount of compressed air and the like, and the size, length, and bending of the supply pipe for iron powder and compressed air. The adjustment was difficult, and as a result, the fusing workability was poor. On the other hand, a large amount of steel wire is used in cargo handling operations such as cranes, and when this wire is used for a certain period of time, it is discarded as scrap and used as an iron source, but it is effectively used for other purposes. At present it was not used. The present invention has been made in view of such circumstances, and it is easy to adjust the supply amount, and as a result, the fusing workability is improved, and further, it is possible to use iron wire that has been conventionally discarded as scrap. It is an object to provide a gas fusing method.

[0004]

According to the present invention, there is provided a gas blowing method comprising the steps of: ejecting cutting oxygen, preheating oxygen, and preheating fuel gas through a crater provided at a tip of a cutting torch; In a gas fusing method for cutting an object to be cut made of extra-heavy steel, special steel, or a metal in a melting furnace of an ironworks, a used torch composed of a number of stranded wires is provided in front of a gas ejection portion of the cutting torch. A steel wire is supplied to cut the object to be cut.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a schematic configuration diagram of a gas fusing apparatus to which a gas fusing method according to an embodiment of the present invention is applied. As shown in FIG. 1, a gas fusing apparatus 10 to which a gas fusing method according to an embodiment of the present invention is applied is mounted on a traveling carriage 11 that can move in the front-back, left-right directions. A guide (not shown) is fixed on the traveling vehicle 11, and an advance / retreat frame (not shown) that can advance / retreat along the guide is attached. A cutting torch 12 is provided on the advance / retreat frame, and a crater 13 is provided at the tip of the cutting torch 12.
Is installed.

[0006] In the upstream portion of the cutting torch 12 (upper side in the figure), cutting oxygen is passed through a blow pipe 14 and a crater 13 toward a special steel 15 (for example, having a thickness of 1500 mm) which is an example of an object to be cut. For cutting oxygen, preheating oxygen, and fuel gas for preheating by cutting out the extra-thick special steel 15 by squirting preheating oxygen and fuel gas for preheating, and blowing pipe 14 and crater 1
Connection fittings 16 for supplying and discharging cooling water for cooling
7, 18 are provided. Connection fittings 16, 17, 18
Are connected to the corresponding fittings (not shown),
It is connected to a supply source or a discharge destination via a pipe or a hose.

A wire supply means 21 for supplying a steel wire 20, which is an example of an iron wire composed of a large number of stranded wires, is provided on the traveling carriage 11 in front of the gas ejection portion 19 of the cutting torch 12. ing. The diameter of the steel wire 20 is, for example, 9 to 26 mm (more preferably, 16 to 26 mm).
~ 22mm), wire rope type is 6 × 19,6
× 24, 6 × 37, etc. can be used.

[0008] Cutting torch 1 provided on the reciprocating frame
In the vicinity of 2, a fixed guide 22 that moves integrally with the cutting torch 12 and guides the supplied steel wire 20 to the front of the gas ejection portion 19 is attached. Fixed guide 22
Is formed in a pipe shape so that the steel wire 20 can pass therethrough. A wire 23 on which a steel wire 20 is wound is mounted on the traveling vehicle 11, and the steel wire 20 is rewound from the wire 23 and supplied to the front of the gas ejection portion 19 via a fixed guide 22. A supply mechanism 24 is provided. The wire supply mechanism 24 has upper and lower supply rollers 25 and 26 that are driven across a steel wire 20 by a drive source such as a motor (not shown).
A drive source such as a motor has a structure capable of controlling the supply speed of the steel wire 20. The wire aryl 23 is constantly urged in a direction of winding up the steel wire 20 by using an urging means separately.

On the traveling carriage 11, a wire guide mechanism 27 capable of guiding the steel wire 20 in accordance with the advance / retreat operation of the advance / retreat frame (that is, the cutting torch 12 and the fixed guide 22) is provided. As shown in the figure, the wire guide mechanism 27 includes a plurality of pipe-shaped moving guides 28 through which the steel wire 20 passes, a hanging wire 29 capable of hanging the moving guide 28, and a plurality of hanging wires 29. The upper hoop section 30 includes a guide rail 31 made of a slidable steel wire, and a chain 32 that is an example of a flexible material that connects adjacent moving guides 28. In the wire guide mechanism 27 shown in FIG. 1, the fixed guide 22, that is, the cutting torch 12 is in a state where it is at the forward limit. However, as shown in FIG.
Fixed on top. The wire supply means 21 includes a wire array 23, a wire supply mechanism 24, and a wire guide mechanism 27.

Next, a gas fusing method according to an embodiment of the present invention will be described using a gas fusing apparatus 10. The advance / retreat frame of the gas fusing device 10 is arranged at the retreat limit, and the wire supply mechanism 24 of the wire supply means 21 is arranged such that the tip of the steel wire 20 is in front of the gas ejection portion 19.
Is driven and adjusted. The traveling carriage 11 on which the gas fusing device 10 is mounted is moved back and forth, left and right, and the positioning of the cutting torch 12 with respect to the extra-thick special steel 15, that is, the positioning of the cutting start position is performed.

Next, the blowing pipe 14 and the crater 13 are cooled by cooling water.
While cutting, the cutting oxygen, the preheating oxygen, and the fuel gas for preheating are blown out through the blowing pipe 14 and the crater 13 to start cutting the extra-thick special steel 15. The steel wire 20 burns violently by the preheating flame and the cutting oxygen by the preheating oxygen and the preheating fuel gas to generate high temperature and heat. At this time, since the steel wire 20 is composed of a large number of stranded wires, it is easily melted, and the extra-thick special steel 15 is melted by utilizing the high temperature and high heat, and the steel wire 20 is melted by the kinetic energy of the cutting oxygen. Is accelerated, and can be cut by colliding with the extra-thick special steel 15.

As the gas fusing progresses in the thickness direction of the fixed extra-large special steel 15, the steel wire 20 that is damaged by the gas melting is advanced.
So that the tip of is always in front of the gas ejection part 19,
The steel wire 20 is supplied via the wire supply mechanism 24. At this time, the supply speed of the steel wire 20 is controlled in consideration of the material and thickness of the extra-thick special steel 15 and supply conditions of cutting oxygen, preheating oxygen, preheating fuel gas, and the like. further,
As the gas fusing proceeds in the length direction of the extra-thick special steel 15, the advance / retreat frame is advanced, and the cutting torch 12 and the fixed guide 22 are advanced.
4 so that the tip of the eroded steel wire 20 is always in front of the gas ejection portion 19.
Control the supply of At this time, the moving guide 2 attached via the chain 32 according to the advance of the fixed guide 22
Since the wire 8 moves along the guide rail 31, the steel wire 20 is reliably guided by the fixed guide 22.

In the above manner, when the gas cutting of the extra-thick special steel 15 is completed, the supply of the cutting oxygen, the preheating oxygen, and the fuel gas for preheating is stopped, and the wire supply mechanism 24 is moved while the advance / retreat frame is retracted. , The steel wire 20 is wound around the wire aryl 23, and the advance / retreat frame is moved to the retreat limit. Thereafter, the connection of the cutting oxygen, the preheating oxygen, and the fuel gas for preheating is released to complete all the operations.

Therefore, in the gas fusing method according to one embodiment of the present invention, the same effect as in the case where the steel wire 20 composed of many stranded wires is made of iron powder (powder fusing method) is exhibited. The required gas fusing effect can be obtained. Further, since the steel wire 20 can use a used steel wire used for a crane or the like, it is very economical. The steel wire 20 is, for example, 9 to 2
Since it has a predetermined diameter of 6 mm, the steel wire 2
The supply of 0, in particular the control of the supply speed, is very simple and reliable.

In the above-described embodiment, the special steel 15 to be cut has been described as an object to be cut. However, the present invention is not limited to this, and metal, scrap, and the like generated in a melting furnace of an ironworks can be used. In particular, in the case of ingots, since slag adheres to the surface, the gas fusing method of the present embodiment, which exhibits the same action as the powder fusing method, is extremely effective. The cutting torch 12 and the fixed guide 22 were mounted on the traveling vehicle 11 via an advance / retreat frame and moved forward and backward. However, if necessary, the cutting torch 12 and the fixed guide 22 were directly mounted on the traveling vehicle, and the fusing position was determined by moving the traveling vehicle back and forth or right and left. Can also be changed. In this case, the wire guide mechanism 27 becomes unnecessary. Further, although the cutting torch 12 and the wire supply means 21 are arranged on the traveling carriage 11, the cutting torch 12 and the wire supply means 21 can be mounted on different traveling carriages and controlled separately. As the preheating fuel gas, acetylene gas, propane gas, LPG (liquefied petroleum gas) or the like can be used.

[0016]

According to the gas fusing method of the present invention, an iron wire composed of a large number of stranded wires is supplied in front of the gas ejection portion of the cutting torch to cut the object to be cut. As a result, the numerous stranded wires that make up the iron wire can perform the same function as iron powder in the conventional powder fusing method to reliably cut the object to be cut, and adjust the supply amount of the iron wire. Is easy, and as a result, the fusing workability is improved. In addition, by using a used steel wire for the iron wire, it is possible to effectively use the steel wire that has been conventionally discarded as scrap, which is economical. And especially, the object to be cut is
By using the metal in the melting furnace of an ironworks, the metal covered with slag can be reliably cut, and the fusing workability is further improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a gas fusing method according to an embodiment of the present invention.

[Description of Signs] 10: gas fusing device, 11: traveling trolley, 12: cutting torch, 13: crater, 14: blowpipe, 15 extra thick special steel (object to be cut), 16: connection fitting, 17: connection fitting, 18: Connection fitting, 19: Gas ejection part, 20: Steel wire (iron wire), 21: Wire supply means, 22: Fixed guide, 2
3: wire aryl, 24: wire supply mechanism, 25 supply roller, 26: supply roller, 27: wire guide mechanism,
28: movement guide, 28a: movement guide, 29: hanging wire, 30: hoop portion, 31: guide rail, 32: chain (flexible member)

Claims (3)

[Claims] 1. Cutting oxygen, preheating oxygen, and fuel gas for preheating are ejected through a crater provided at the tip of a cutting torch,
In a gas fusing method for cutting an object to be cut, in front of a gas ejection portion of the cutting torch, an iron wire composed of a number of stranded wires is supplied to cut the object to be cut. Fusing method. 2. The gas fusing method according to claim 1, wherein
The method according to claim 1, wherein the iron wire is a used steel wire. 3. The gas fusing method according to claim 1, wherein the object to be cut is a metal of a melting furnace of an ironworks.