JPH0255670A - Oxygen arc automatic cutting method - Google Patents

Abstract

PURPOSE:To continuously and efficiently cut material to be cut by continuously supplying an iron wire impressed with the voltage to the inside of a metallic pipe and blowing O2 into the metallic pipe at the same time to burn the iron wire while generating an arc between the iron wire tip and the material to be cut. CONSTITUTION:The iron wire 5 is pulled out from a coil 6 and the prescribed DC required for generating the arc is given thereto via a supply roll 7 and the wire 5 is introduced continuously into the metallic pipe 1 from a seal part of the pipe 1. During this time, O2 is blown from an O2 supply port 2 of the pipe 1 and injected toward the material 10 to be cut from an open end 4. By this method, spark discharge is produced to generate the arc between the iron wire 5 tip and the material 10 to be cut and an oxidation reaction is generated between the wire tip and the injected O2 and the iron wire 5 is burnt. A part to be cut of the material 10 to be cut is then molten by the combustion heat and blown off by the O2, by which the material 10 to be cut is cut.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an oxygen arc automatic cutting method.

Conventional technology Conventionally, when cutting materials, plasma cutting methods, emery cutting methods, oxygen arc cutting methods, powder cutting methods using iron powder and acetylene gas, etc. have been used. Electroslag method (
The powder cutting method is mainly used to cut ingots manufactured by the CESR method (hereinafter referred to as the CESR method).

Problems to be Solved by the Invention By the way, the cutting method using plasma can only cut up to about 190 pieces at most, and the cutting method using emery can only cut up to about 190 pieces.
This requires a huge amount of equipment, leading to high costs, and it cannot be said to be a simple cutting method. Further, the powder cutting method has a disadvantage in that the material to be cut must be preheated to 1000° C. in order to use acetylene gas.

On the other hand, with the oxygen arc cutting method, oxygen is introduced into the metal pipe and the metal pipe is combusted to perform the cutting, so when the metal pipe is used up, it is necessary to replace it with a new metal pipe and the cutting operation is performed. There was a problem that it could only be carried out continuously.

The present invention has been made in view of the above-mentioned problems in the conventional technology.

Therefore, an object of the present invention is to provide a cutting method that can continuously and efficiently cut a material to be cut using a simple device.

Means and Effects for Solving the Problems The present inventors have found that the oxygen arc cutting method is most efficient and most preferable for hot or warm cutting of ingots, etc. in the CESR method, and the oxygen arc cutting method As a result of considering the development of a method to continuously implement
The present invention has now been completed.

The oxygen arc automatic cutting method of the present invention continuously supplies a voltage-applied iron wire into a metal pipe having an oxygen supply port, and at the same time blows oxygen from the oxygen supply port.
While generating an arc between the ear tip and the material to be cut,
It is characterized by burning iron wire and using the combustion heat to cut the material to be cut.

In the present invention, when a voltage-applied iron wire is supplied into a metal pipe, an arc is generated between the tip of the iron wire and the material to be cut. Note that the voltage may be either a direct current voltage or an alternating current voltage, but a direct current voltage is preferable in terms of arc stability. The iron wire undergoes an oxidation reaction with the oxygen supplied from the oxygen supply port of the metal pipe due to the generated arc, combusts, and generates heat. This combustion heat melts the part of the material to be cut, and the material to be cut is cut. For example, the iron wire is held in a coiled state and fed continuously, so the cutting operation of the material to be cut can be carried out continuously, making it possible to automate the cutting operation. Become.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1st
The figure is an explanatory diagram showing a schematic configuration of an oxygen arc automatic cutting device that implements the present invention. In the figure, 1 is a metal pipe, for example, a pipe made of copper and having an inner diameter of about 10 to 20 knots is used. Preferably, this metal pipe has an outer jacket having a cooling water flow path. An oxygen supply port 2 for introducing oxygen is provided near one end of the metal pipe.

Further, one end of the metal pipe is an open end 3, and one end of the pond is a seal portion 4. Coil 6 in the seal part
The iron wire 5 from above is introduced in a sealed state. The iron wire 5 usually has a diameter of 3 to 4
++n or so is used. 7 is a supply roll connected to the power source 9, and 8 is a supply roll. Further, 10 indicates a material to be cut.

In order to carry out the present invention, the iron wire 5 is drawn out from the coil 6 by a suitable driving means (not shown), and a predetermined direct current necessary for arc generation is applied to the supply roll 7.
It is continuously introduced into the metal pipe from the seal part 4 of the metal pipe 1. Oxygen is blown into the metal pipe from the oxygen supply port 2 and ejected from the open end 4 toward the material to be cut 10 .

The tip of the iron wire introduced into the metal pipe causes a spark discharge with the material to be cut, generating an arc, and an oxidation reaction with the ejected oxygen, resulting in combustion.

The part of the material to be cut 10 to be cut is melted by the heat of combustion, and is blown away with oxygen, thereby being cut.

Effects of the Invention Since the cutting method of the present invention has the above configuration,
It is now possible to perform oxygen arc cutting continuously using simple equipment, and therefore, according to the present invention, it is possible to automate the cutting operation and efficiently cut the material to be cut. I can do it.

Also, what kind of materials can the present invention be applied to? In particular, is it effective for cutting materials that undergo hot cutting or warm cutting, such as cutting ingots manufactured by the CESR method? It is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a schematic configuration of an oxygen arc automatic cutting device implementing the present invention. DESCRIPTION OF SYMBOLS 1...Metal pipe, 2...Oxygen supply port, 3...Open end, 4...Seal part, 5...Iron wire, 6...
Coil, 7... Supply roll, 8... Supply roll, 9
... Power supply, 10... Material to be cut. Patent applicant: Daido Steel Co., Ltd. Representative: Patent attorney Tsuyoshi Hirobe

Claims (1)

[Claims] (1) A voltage-applied iron wire is continuously supplied into a metal pipe that has an oxygen supply port, and at the same time oxygen is blown from the oxygen supply port to generate an arc between the tip of the iron wire and the material to be cut. An oxygen arc automatic cutting method characterized by burning iron wire and cutting the material to be cut using the combustion heat.