KR101595102B1 - Method for the preparation thereof and plasma cutting electrode and torch head structures and preparing method thereof - Google Patents

Method for the preparation thereof and plasma cutting electrode and torch head structures and preparing method thereof Download PDF

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Publication number
KR101595102B1
KR101595102B1 KR1020150066334A KR20150066334A KR101595102B1 KR 101595102 B1 KR101595102 B1 KR 101595102B1 KR 1020150066334 A KR1020150066334 A KR 1020150066334A KR 20150066334 A KR20150066334 A KR 20150066334A KR 101595102 B1 KR101595102 B1 KR 101595102B1
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KR
South Korea
Prior art keywords
electrode
hafnium
silver
brazing
plasma cutting
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KR1020150066334A
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Korean (ko)
Inventor
김태홍
이흥수
강동화
김준영
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김태홍
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K10/00—Welding or cutting by means of a plasma
    • H05H2001/3442—

Abstract

The present invention relates to a method of manufacturing an electrode for plasma cutting, and more particularly, to a torch head structure having an electrode for plasma cutting and an electrode for plasma cutting, And a torch head structure equipped with electrodes for plasma cutting and electrodes for cutting plasma.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a torch head having an electrode for plasma cutting and an electrode for plasma cutting,

The present invention relates to a method for manufacturing a plasma cutting electrode capable of maximizing the service life of an electrode tip by reducing the consumption of hafnium used for an electrode tip of a plasma cutting electrode and a torch provided with an electrode for plasma cutting and an electrode for plasma cutting, Head structure.

Generally, plasma cutting is a device for cutting a metal plate, and is used for cutting various metal plates by using a plasma principle generated by a nozzle of a torch and an electrode.

The electrode used for cutting the plasma is mounted on the tip of the torch and becomes a main component for generating plasma.

The electrode is typically made of a copper (Cu) material and a bar-shaped hafnium is inserted and fixed in a middle portion of the electrode body.

In the case of the above-mentioned electrode, it has been difficult to manufacture in the prior art and it has been dependent on imports.

Conventionally, a method of manufacturing a plasma cutting electrode includes a method of brazing a silver (Au) lead by inserting hafnium (Hf) into an electrode body made of copper (Cu), a method of inserting a hafnium And then inserted into the electrode body again for bonding.

However, in the conventional manufacturing method using the brazing joint, since the body of copper (Cu) material does not have excellent thermal conductivity to transfer to hafnium (Hf), irregular arc heat is generated, so that the consumption of the hafnium (Hf) In addition, in the case of a manufacturing method in which a silver tube in which a hafnium (Hf) rod is inserted is inserted again into the electrode body, the hafnium (Hf) rod is forcedly inserted into the silver tube, A minute gap is formed between the fine silver tube and the electrode main body due to the temperature rise, irregular arc heat due to irregular conduction is generated, so that consumption of the hafnium (Hf) rod is accelerated and the lifetime is shortened.

Therefore, copper (Cu) and hafnium (Hf) are expensive materials. Therefore, frequent replacement of electrodes due to consumption of hafnium causes uneconomical problems

In order to solve the above problems, Japanese Patent Application Laid-Open No. 10-0750809 entitled " Plasma Cutting Electrode and Method for Manufacturing the Same " In order to reduce the consumption of the rods, a hafnium (Hf) rod which generates an arc is inserted into a silver (Ag) tube and is bonded in a vacuum furnace by a high-temperature vacuum brazing method. Cu), and is bonded by a vacuum brazing method using a silver wire in a high-temperature vacuum furnace, thereby prolonging the lifetime of the electrode.

In addition, in Patent Document 2, there is a step of forming an electrode body, a step of forming an electrode cap capable of fitting to the electrode body, a primary bonding step of fitting and fixing an electrode member to one side of the electrode cap, And a step of correcting the coupling concentricity of the electrode main body and the electrode cap. In this case, the bonding type by the deterioration phenomenon when the hafnium (Hf) is bonded to the electrode main body Which has been prevented from being deformed.

Korean Registered Patent No. 10-0750809 (2007.8.14) Korean Registered Patent No. 10-0891343 (Mar. 25, 2009)

In order to maximize the useful life of the electrode by reducing the consumption of hafnium in the electrode for plasma cutting, an electric conductor is formed between the electrode body and the hafnium, and silver having a high purity is formed into a rod shape, And a method of manufacturing an electrode for plasma cutting, which can be manufactured by brazing to an electrode body.

In the present invention, a method of brazing to the electrode body and hafnium by means of silver is difficult, and a brazing process adapted according to difficulties is constituted, and the electrode for plasma cutting is constituted by the method of manufacturing an electrode for plasma cutting It has its purpose.

It is another object of the present invention to provide a torch head structure having a torch to which a plasma cutting electrode is applied, in which electrodes for plasma cutting are provided so that the service life of hafnium can be further improved.

According to an aspect of the present invention for achieving the above object,

According to the invention described in claim 1, A silver bar manufacturing step in which a silver material is pulled out to form a rod shape and then cut along a length by a predetermined length to penetrate through a hollow portion into which the hafnium is inserted and an insertion groove into which the silver ring is inserted at the upper end of the hollow portion; ; A hafnium production step in which a material made of hafnium is processed into a rod shape by a predetermined length; A mounting groove is formed so that a silver bar integrated with hafnium can be inserted therein and a mounting groove is formed at a lower end of the mounting groove so as to have a length equal to the diameter of the silver wire and the length of silver wire and hafnium, An electrode body manufacturing step in which an adhesive groove is formed in an upper inner circumference of the groove to insert a silver-containing ring for brazing; And an insertion groove formed between the hafnium and the silver bar, and an adhesive groove formed between the silver bar and the electrode main body, wherein the silver bar is inserted into the mounting groove of the electrode main body, And a vacuum brazing step of vacuum-brazing and joining the first and second substrates to each other via silver soldering rings.

According to the invention described in claim 2, In the vacuum brazing step, a silver ring was interposed between the insertion groove formed between the hafnium and the silver bar and the adhesive groove formed between the silver bar and the electrode body, and the preform was subjected to a preheating process at 400 ° C for 40 minutes, followed by vacuum brazing at 900 ° C for 50 minutes Followed by vacuum brazing at 600 DEG C for 10 to 20 minutes through a cooling process.

According to the invention described in claim 3, The hollow material is drawn into a diameter of 5 to 8 mm to be formed into a rod shape, cut along a length of 5 to 6 mm, and a hollow portion into which hafnium is inserted is formed. The hollow portion passes through the hollow portion with a diameter of 2.4 mm. A silver bar having a diameter of 2.4 mm and a length of 8 mm and having an insertion groove into which a silver ring for brazing is inserted; a silver bar having a diameter equal to the diameter of the silver bar at the lower end for inserting the hafnium and the silver bar; And an insertion groove into which a silver ring for brazing is inserted is formed around an upper end inner periphery of the mounting groove, and an electrode main body in which hafnium is inserted into the hollow portion of the silver bar, Is inserted into the mounting groove of the electrode body, and a silver ring is inserted between the insertion groove and the adhesive groove between the silver bar and the electrode body between the hafnium and the silver bar, followed by vacuum brazing And a gong.

According to the invention described in claim 4, A plasma cutting apparatus, comprising: a torch body having an electrode (50) for cutting plasma according to any one of claims 1 to 3 mounted on a tip end thereof; a plasma gas conduit fastened to an outer periphery of the electrode; And a shield cap mounted on an outer periphery of the nozzle.

A cooling water space (H) for cooling the electrode (50) and the nozzle (52) is formed between the nozzle (52) and the shield cap (54) according to claim 5, (54a) through which the shield gas (S) passes is formed inside the shield cap (54).

According to the method of manufacturing an electrode for plasma cutting according to the present invention and the electrode for plasma cutting according to the present invention, a silver wire having a good electrical conductivity is processed into a rod shape, and then a silver wire having a certain thickness is vacuum brazed in the form of wrapping the hafnium, The arc heat generated during the plasma generation is uniformly conducted by the silver wire, and the arc heat is transmitted to the hafnium regularly, so that consumption of the hafnium is drastically reduced, thereby maximizing the service life of the electrode.

That is, the silver having excellent electrical conductivity is mediated between the hafnium and the electrode body, but the integrated brazing process can be performed without generating voids by a suitable brazing process, thereby providing a brazing technique with improved silver ring.

Further, the present invention provides a torch head structure including a plasma cutting electrode, wherein a cooling water space is formed between the nozzle and the shield cap to effectively cool the electrode and the nozzle to improve the service life of the electrode, the nozzle, and the torch Effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method of manufacturing an electrode for plasma cutting according to the present invention. FIG.
FIG. 2 is a diagram showing a manufacturing step of silver halide in the method of manufacturing an electrode for plasma cutting according to the present invention. FIG.
3 is a view showing a step of producing hafnium in the method for manufacturing an electrode for plasma cutting according to the present invention.
FIG. 4 is a diagram showing a manufacturing step of an electrode body in the method of manufacturing an electrode for plasma cutting according to the present invention. FIG.
5 is a view showing a brazing step in the method of manufacturing an electrode for plasma cutting according to the present invention.
6 is a perspective view showing a plasma cutting electrode manufactured by the plasma cutting electrode manufacturing method of the present invention.
7 is a cross-sectional view showing the structure of a torch head equipped with an electrode according to an embodiment of the present invention.
FIG. 8 is an enlarged cross-sectional view of an A portion of a torch head having an electrode according to an embodiment of the present invention. FIG.
FIG. 9 is a cross-sectional view illustrating an operation state of a torch head equipped with an electrode according to an embodiment of the present invention; FIG.
10 is a photograph showing a comparison between the electrode according to the present invention and the conventional electrode.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

FIG. 1 is a flowchart showing a method of manufacturing an electrode for plasma cutting according to the present invention, FIG. 2 is a diagram showing a step of manufacturing a silver rod in the method of manufacturing an electrode for plasma cutting according to the present invention, FIG. 4 is a view showing a manufacturing step of an electrode body in the method of manufacturing an electrode for plasma cutting according to the present invention, and FIG. 5 is a view showing a step of manufacturing an electrode body for plasma cutting according to the present invention. Fig.

As shown in FIG. 1, the method for manufacturing an electrode for plasma cutting according to the present invention comprises a silver electrode manufacturing step, a hafnium manufacturing step, an electrode body manufacturing step, and a vacuum brazing step.

1) silver-clad manufacturing step (S100)

The hollow portion 11 is formed by drawing a silver material into a rod shape 11a, cutting it along a length by a predetermined length, passing through a hollow portion 11 into which hafnium is inserted, (10) in which an insertion groove (12) for inserting an insertion hole (40) is formed.

2) Preparation of hafnium (S200)

The material made of hafnium 20 is processed into a rod shape by a predetermined length, and is processed longer than the length of the silver rod 10.

3) electrode body manufacturing step (S300)

The electrode body 30 is made of the same material and has a mounting groove 31 formed therein so that the silver bar 10 integrated with the hafnium 20 can be inserted and mounted. A T-shaped mounting groove 31 is formed by the length of the silver bar 10 and the hafnium 20 and an adhesive groove 31 for inserting a silver ring 40 for brazing around the upper end of the mounting groove 31 32 are formed.

4) Vacuum Brazing (S400)

The hafnium 20 is inserted into the hollow portion 11 of the silver rod 10 so that the upper end of the silver bar 10 and the upper end of the hafnium 20 are aligned with each other,

The silver electrode 10 having the hafnium 20 inserted therein is inserted into the mounting groove 31 of the electrode body 30.

An insertion groove 12 formed between the hafnium 20 and the silver bar 10 and an adhesive ring 32 formed between the silver bar 10 and the electrode body 30 are connected to a vacuum Brazing and joining.

The conditions of the vacuum brazing are that the proper preheating temperature during brazing of copper and silver is maintained at 400 ° C for 40 minutes.

The melting point of silver is 960 占 폚 and the melting point of syngas is 1080 占 폚.

At this time, as the melting point is lowered when the silver and the copper are bonded, a low melting point is most suitable for the temperature test, which is set at 900 ° C.

In this state, the silver braze is vacuum-brazed at 900 ° C for 50 minutes in a state where it is inserted into the mounting groove 31 of the electrode main body 30.

When brazing is completed, stable brazing is completed by cooling at 600 ° C. for about 10 to 20 minutes.

Meanwhile, in the vacuum brazing step, the brazing of the hafnium and the silver wire, and the silver wire between the silver wire and the electrode body, which are different materials from each other, are performed at the same time. The silver wire and the brazing of the electrode body may be separated into one or two pieces.

Hereinafter, a plasma electrode manufactured by the plasma cutting electrode manufacturing method according to the present invention will be described in detail.

6 is a perspective view of a plasma cutting electrode manufactured by the plasma cutting electrode manufacturing method of the present invention,

The hollow member 11 is formed by drawing a silver material into a rod having a diameter of 5 to 8 mm and cutting the rod into 5 to 6 mm along the length and inserting the hafnium 20 therein. And a silver bar 10 having an insertion groove 12 through which a silver ring 40 for brazing is inserted is formed at the upper end of the hollow part 11. [

The diameter of the silver bar 10 is equal to the diameter of the silver bar 10 at the lower end so that the hafnium 20 and the silver bar 10 are inserted. And a mounting groove 31 having a length equal to the length of the hafnium 20 and having an adhesive groove 32 formed therein for inserting a silver ring 40 for brazing around the upper end of the mounting groove 31 And an electrode body (30).

The hafnium 20 is inserted into the penetrating hollow portion 11 of the silver bar 10 so that the upper end of the silver bar 10 and the upper end of the hafnium 20 coincide with each other. And the inserted silver bar 10 is inserted into the mounting groove 31 of the electrode main body 30.

A silver ring 40 is inserted between the insertion groove 12 and the adhesive groove 32 between the silver bar 10 and the electrode body 30 between the hafnium 20 and the silver bar 10 and vacuum brazed, Thereby constituting an electrode.

As described above, the vacuum brazing is preheated at 400 ° C. for 40 minutes in a state where the silver-containing ring 40 is interposed therebetween, brazed at 900 ° C. for 50 minutes, cooled at 600 ° C. for 10 to 20 minutes The vacuum brazing is completed.

As described above, the plasma electrode 50 manufactured by the method for manufacturing a plasma cutting electrode according to the present invention has the silver electrode 10 having a predetermined thickness, which is excellent in electrical conductivity, and is formed by the hafnium 20 and the electrode body 30 ), Vacuum brazing is performed by a vacuum brazing process which is adapted so as not to generate voids between dissimilar materials, so that the arc heat generated in the course of plasma generation can be regularly transferred to the hafnium by the silver wire, The consumption of hafnium is reduced and the life of the electrode is maximized.

Hereinafter, the structure of the torch provided with the plasma cutting electrode of the present invention will be described.

FIG. 7 is a cross-sectional view illustrating a structure of a torch head having electrodes according to an embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view of an A portion of a torch head equipped with an electrode according to an embodiment of the present invention .

The electrode 50 according to the present invention is mounted on the tip of the torch body 60 and the plasma gas conduit 51 is mounted on the outer circumference of the electrode 50. A nozzle 52 is attached to the tip of the electrode 50 A shield cap 54 is mounted on the outer periphery of the nozzle 52 so that a cooling water space H is secured between the nozzle 52 and the shield cap 54, And a torch head structure in which a flow path 54a through which shield gas flows is formed inside the cap 54. [

9, the structure of the torch head structure has a structure in which a cooling water space H is secured between the nozzle 52 and the shield cap 54 at the same time as the effect of the electrode according to the present invention, It is possible to effectively prevent the electrode 50 and the nozzle 52 from being overheated due to the arc heat as the circulation of the cooling water W is smoothly performed and the lifetime can be improved and the shield gas 54 So that the shielding gas is directly communicated with the gas hole 52a between the nozzle 52 and the nozzle cap 53 without clogging so that the swell is amplified to maximize the restraint of the plasma, .

FIG. 10 shows a comparison between the electrode according to the present invention and the conventional electrode.

That is, after the plasma cutting operation using the conventional electrode and the torch and the electrode and torch of the present invention is performed for the same time, the electrode is cut and the consumed state of hafnium is shown. In the conventional electrode, It can be seen that the upper end portion of the hafnium is consumed in the case of the electrode of the present invention.

Therefore, it can be understood that the structure of the torch head provided with the electrode for plasma cutting according to the present invention is a technique for improving the service life of the torch 60 in addition to the electrode 50 and the nozzle 52.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.


10: Gypsum
20: hafnium
30: Electrode body
40: silver-free ring
50: Electrode
60: Torch body
51: gas conduit 52: nozzle 53: nozzle cap 54: shield cap
H: Cooling water space S: Shield gas

Claims (5)

The hollow material 11 is cut into a rod shape 11a having a length of 5 to 8 mm and cut with a length of 5 to 6 mm along the length of the hollow material 11. The hollow part 11 through which the hafnium is inserted is passed through with a diameter of 2.4 mm, A step (S100) of producing a silver bar (10) in which an insertion groove (12) into which a silver ring (40) is inserted is formed at an upper end of the hollow part (11);
A step (S200) of fabricating hafnium (20) which is formed by processing a material made of hafnium into a rod having a diameter of 2.4 mm and a length of 8 mm;
A mounting groove 31 is formed so that a silver bar 10 integrated with the hafnium 20 can be inserted and mounted. The mounting groove 31 is formed at the lower end of the silver bar 10, The mounting groove 31 is formed by the length of the mounting groove 31 and the adhesive groove 32 is formed around the upper end of the mounting groove 31 for inserting the silver ring 40 for brazing, (30) manufacturing step (S300);
The silver electrode 10 having the hafnium 20 inserted therein is inserted into the mounting groove 31 of the electrode body 30 after the hafnium 20 is inserted into the hollow portion 11 of the silver bar 10, And an insertion groove 40 formed between the insertion groove 12 formed between the hafnium 20 and the silver bar 10 and the adhesive groove 32 formed between the silver bar 10 and the electrode body 30, Brazing and joining,
(S400) of performing vacuum brazing at 400 DEG C for 40 minutes, vacuum brazing at 900 DEG C for 50 minutes, and vacuum brazing at 600 DEG C for 10 to 20 minutes through a cooling process Wherein the plasma cutting electrode is formed of a metal.
delete delete A plasma gas conduit 51 which is fastened to the outer circumference of the electrode 50 and an electrode 50 which is connected to the outer circumference of the electrode 50. The torch main body 60 has an electrode 50 for cutting plasma according to the manufacturing method of claim 1, And a shield cap 54 mounted on an outer periphery of the nozzle 52. The shield cap 54 is attached to the tip of the nozzle 52,
A cooling water space H for cooling the electrode 50 and the nozzle 52 is formed between the nozzle 52 and the shield cap 54,
And a flow path (54a) through which the shield gas (S) passes is formed inside the shield cap (54). delete
KR1020150066334A 2015-05-12 2015-05-12 Method for the preparation thereof and plasma cutting electrode and torch head structures and preparing method thereof KR101595102B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200048263A (en) 2018-10-29 2020-05-08 하영근 torch assembly for welding

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100750809B1 (en) 2005-10-07 2007-08-27 김태홍 Plasma cutting electrode and method for the preparation thereof
KR100891343B1 (en) 2007-06-21 2009-03-31 이일호 Plasma cutting machine electrode and manufacturing method thereof
KR20090105009A (en) * 2008-04-01 2009-10-07 김종헌 Electrode arc of plasma cutting machine
KR20150031188A (en) * 2013-09-13 2015-03-23 크엘베르크-스티프텅 Electrode structure for plasma cutting torches

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100750809B1 (en) 2005-10-07 2007-08-27 김태홍 Plasma cutting electrode and method for the preparation thereof
KR100891343B1 (en) 2007-06-21 2009-03-31 이일호 Plasma cutting machine electrode and manufacturing method thereof
KR20090105009A (en) * 2008-04-01 2009-10-07 김종헌 Electrode arc of plasma cutting machine
KR20150031188A (en) * 2013-09-13 2015-03-23 크엘베르크-스티프텅 Electrode structure for plasma cutting torches

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200048263A (en) 2018-10-29 2020-05-08 하영근 torch assembly for welding

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