JPS59120396A - Production of continuous gouging electrode - Google Patents

Abstract

PURPOSE:To produce efficiently a continuous gouging electrode by winding spirally a flexible metallic plate to form a pipe, and packing a kneaded material composed of a carbonaceous material contg. a fibrous carbon material and a binder therein. CONSTITUTION:A thin belt-like metallic plate (a) having flexibility is wound to a cylindrical shape by winding rolls (b) to form a metallic pipe (c), and a kneaded material (e) consisting essentially of a carbonaceous material is packed therein to form a gouging electrode. The material (e) is prepd. by kneading a carbonaceous material contg. at least a fibrous carbon material or carbide and a graphite material as well as a binder such as tar while heating the same to about 100-300 deg.C. Arc burning takes place at the top end (f) of the metallic pipe filled therein with the material (e) by high current and therefore the top end is sintered in a short time and is calcined to a specified shape, thus providing a function as a gouging electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a gouging electrode (hereinafter referred to as a "continuous gouging electrode") suitable for continuous operation, and more specifically relates to a method for manufacturing a gouging electrode suitable for continuous work. A metal pipe made by spirally winding a thin band-shaped metal plate is filled with a mixture of at least a fibrous carbonaceous substance, a carbonaceous material containing carbide, or a graphite material and a binder. This invention relates to a method for manufacturing continuous gouging electrodes by sintering them using the heat generated during combustion.

Conventionally, this kind of! As the electrode, for example, as shown in FIG. 1, an electrode as described in Japanese Patent Publication No. 45-24009 has been proposed.

This electrode is characterized by being a gouging electrode made by filling a flexible metal pipe (1) with a mixture of graphite and a binder (2).

However, the above electrode is made of, for example, 300 meshes of powdered artificial graphite, tar, pitch, phenol, etc. in a cylindrical metal pipe. Since it is filled with a mixture with a binder such as V resin or urea resin, it has the following problems and is an unresolved problem in practical use.

(a) Since the metal pipe is wound in a spiral shape, when the electrode is bent or stretched (when used in a straight line), the spiral portion of the metal plate may be slightly affected by metal plasticity or elastic strain stress. A gap is created, and the mixture of powdered graphite and binder filled in the metal pipe spills out from the gap, and part of the graphite powder in the nodal-filled mixture cannot be used effectively. They were worried about such inconveniences.

Even if a metal pipe from the filled mixture, in which graphite powder in particular begins to fall off, is used as an electrode, a pole will be formed on the metal pipe itself and it will not be able to withstand the heavy ring arc heat and will melt. It is difficult to dig grooves in the base material to be gouged, and the shape of the grooves becomes extremely unstable, making it difficult to perform gouging operations smoothly.

(b) The binder filled in the electrode due to the thermal conduction of the die cut 1 arc heat during the gouging operation melts before sintering, softens and flows, and the shape of the electrode collapses, creating a cavity. A pole is formed in the pipe and is directly heated, resulting in abnormally fast oxidation and consumption. There are problems such as the fact that harmful gases generated from the air can easily scatter.

In order to solve the problems of the prior art, the present invention provides a carbonaceous material containing at least fibrous carbon material or ash instead of powdered graphite.

A kneaded mixture of a graphite material and a binder is filled into a metal, and the heat generated during combustion of the electrode is used to sinter the carbonaceous material containing a fibrous mixture or the kneaded mixture of a graphite material and a binder. It is an object of the present invention to provide a method for manufacturing a continuous gouging electrode characterized by continuously firing a carbonaceous or graphite electrode into a fixed shape in a metal pipe.

Hereinafter, the present invention will be specifically explained based on the drawings.

FIG. 2 is an explanatory diagram showing an example of the method for manufacturing a continuous gouging electrode of the present invention.

In FIG. 2, (A) is a metal plate, for example, a thin band-shaped flexible material such as iron, steel, aluminum, or copper. (B) is a winding roll, which forms a cylindrical metal pipe (C) by winding the metal plate (A) into a cylindrical shape.

The metal pipe (c) is filled with a kneaded object of a carbonaceous material containing at least a fibrous carbon material or a graphite material and a binder) via the raw material supply pipe.

The fibrous carbon material or carbonaceous material containing carbide here refers to, for example, various organic fibers containing at least carbon (nylon, vinylon, polyacrylic).
1) Full fibers or carbon fiber precursors such as cotton, hemp, bulb fibers, tar, pitch raw carbon fibers, etc., or carbon materials that retain their original fibrous shape by carbonizing a part or all of carbon-containing materials. carbonaceous material or graphite material, etc.

These fibrous carbon materials are different from powdered carbonaceous materials such as coke powder or graphite materials such as graphite powder, and when filled into a metal pipe, they are easily distributed in the pipe against the powder raw material in a mesh-like manner. Since it has the property of not falling off or scattering, it can solve the unresolved problems of conventional electrodes of this type.

In addition, binders include oxides of various substances, thermosetting resins such as phenol resin and Evoquin resin, tar, pitches, and viscous substances such as water glass, CMC, polyphosphates, and alginates. .

The carbonaceous material or graphite material containing these fibrous carbon substances or carbides and the binder are heated at 100 to 300°.
The mixture is kneaded while heating at a temperature of about C and degassing generated harmful gases as necessary.

The warmed product thus obtained is a kneaded product.

What is particularly important in the present invention is that, as mentioned above, the metal pipe is not simply filled with a mixture of powdered graphite material and a binder, but is filled with at least acrylonitrile (PAN).
), tar, pitch as the main raw materials, carbon fiber intermediate products or carbonaceous materials containing several percent or more of ash obtained by steaming various natural and synthetic fibers and retaining the original shape of the fibers, or graphite. A kneaded material of a graphite material or a graphite material and a binder is continuously supplied during the forming of a metal pipe, and is press-filled into the formed metal pipe.

The reason for adopting such a process is that if the metal is simply filled with a mixture of graphite powder and a binder as in the prior art, the graphite powder will fall off and be lost when the metal pipe is bent and stretched, so this can be prevented. Therefore, by filling a metal pipe with a kneaded mixture of a carbonaceous material containing carbide or graphite 4A and a binder that maintains at least the original shape of a fibrous S-shape, the residual retention property in the pipe is reduced to white clay. There is a particular thing.

That is, carbonaceous materials or graphite materials containing fibrous mixtures, such as coke powder containing several percent or more of waste products of carbon fiber intermediate products or curved products, graphite V
) and carbonaceous or graphite materials such as tar, pinch,
The kneaded mixture with various binders such as phenol resin and water glass is heated to 100°C to 300'C in advance and kneaded, which is accompanied by a slight chemical reaction and is sufficiently degassed as a viscous mixture. Due to the fact that the mixture is adjusted to -C and the presence of the fibrous mixture, it is easy to adhere to the wall of the metal pipe, and it also has excellent retention characteristics, so graphite powder is This can prevent it from separating from the mixture with the binder and falling off.

The tip of the metal pipe is sintered in a short time by using the heat generated by this combustion, and is fired into a certain shape. can do. As a result, those near the poles of the arc are formed in the fired body within a short time, and function as a gouging electrode.

As mentioned above, in the present invention, this material contains a binding compound that is partially polymerized by performing a preliminary chemical reaction while heating a carbonaceous material or a graphite material and various binders. Therefore, it is presumed that relatively high-molecular substances such as various fibrous materials form nuclei, and the firing of the carbonaceous material or graphite material can be completed within a short time.

As described above, according to the method of the present invention, the problems of the prior art can be solved and continuous gouging electrodes can be efficiently manufactured.

Examples of the present invention will be described below.

Example A mild steel metal plate (thickness 0.2
60% artificial graphite, 20% pitch raw fiber and pitch 2 using a roll (b).
0% and kneaded at 150°C (E) into the supply pipe), and wound into a spiral shape with an inner diameter of 6
A continuous gouging electrode 3Q77J of H was obtained.

Using the continuous gouging electrode obtained in Example 1 above, the length of the continuous gouging electrode is 30n, and the length of both ends is 201m.
A bending test was conducted in which the pipe was bent 10 times per second, and it was confirmed that the filling material did not fall out from inside the pipe.

A gouging test was carried out using the continuous gouging electrode obtained in Example 1, and the iron base material (T) was measured at 1i1t with a current of 300A and a gouging speed of 9501aT/im.
Depth 5M11 groove width 9 removal amount 1BOF/Various gouging performance was obtained.

As explained above, the continuous gouging electrode of the present invention solves the unresolved problems of conventional gouging electrodes of the same type, and allows continuous gouging electrodes to be manufactured efficiently.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram (9) of conventional continuous gouging electrode production, and FIG. 2 is an explanatory diagram of continuous gouging electrode production of the present invention. (A)・・・・・・・・・Metal plate, Naka）・・・・・・・・・
・Involving roll, (c)...curved metal pipe, (ii)...supply pipe, (e)...curved kneaded material, (f)...・Arc combustion, (g)...
The song... is the number material. Name of patent applicant: Ibiden Co., Ltd. Representative Junichi Taga (10)

Claims (1)

[Claims] 1. Gold with flexible acid 14. When forming a plate pipe, a kneaded mixture of a carbonaceous material or a graphite material containing at least a fibrous carbon substance or carbide and a binder is filled into the metal pipe, and the heat generated during combustion of the gouging electrode A method for manufacturing a continuous gouging electrode, comprising sintering the interfering material.