JPS62118999A - Processing method for plasma electrode - Google Patents

Abstract

PURPOSE:To press-fit an electrode material 51 to an electrode aperture without pressing in by forming with pressure the flat diameter part having more than two opposing faces at least after inserting the electrode material by piercing the electrode aperture at the tip part of the electrode base part. CONSTITUTION:The electrode apertures 25e, 35e, 45e in which an electrode material 51 is inserted at the tip part of the base part 25a, 35a, 45a of electrode 25, 35, 45 are pieced. Then, the electrode material 51 is press-fitted by forming with pressure the flat diameter part 25f, 35f, 45f having at least two opposing faces, after inserting the electrode material 51 corresponding to the diameter and depth of the electrode aperture. There is therefore no difficulty like a press-in, nor dropping. Moreover, in the electrode 45 screwed by a thread part 45s the flat diameter part 45f may be used for applying a spanner.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for processing a plasma electrode used in a plasma cutting torch, and more specifically, a method for attaching an electrode material such as zirconium or hafnium to the tip of an electrode base. It is related to.

Prior art and its problems Generally, this type of plasma electrode is used in plasma cutting torches as shown in FIGS. 5 to 7. The configuration of this plasma cutting torch is as follows: torch body 1. Shield cup 2. Chip 3. Gas branch pipe 4. Electrode 5. The electrode holder is composed of a 6° copper pipe 7 and the like. Then, a plasma arc 9 is generated between the electrode 5 and the base material 8 to cut the base material 8. At this time, in this type of plasma cutting (air plasma), compressed air is used as the gas, and this compressed air is also supplied to the cutting portion of the base material 8 at the same time as the cutting power source (not shown) is turned on. The compressed air is appropriately fed into the torch body 1, passes through the gas passage 6a provided in the electrode holder 6 from the copper vibe 7, and is branched off at the gas branch pipe 4, with one end passing through the orifice of the gas branch pipe 4. Pass through 4a,
The working gas 10 is released from the chip hole 3a of the chip 3 after passing through the chip 3. In addition, in rural areas, gas branch pipe 4
The cooling gas 11 passes through the gas passage 3b of the chip 3 surrounded by the shield cup 2 from outside, and is released from the cup hole 2a of the shield cup 2 as cooling gas 11.

Note that 12 is a torch switch, and 13 is a torch cable.

However, especially in air plasma, the electrode 5 is subject to significant wear due to oxidation, so generally an electrode material such as zirconium or hafnium is attached to the tip of the electrode 5.

Conventionally, the fourth electrode of this plasma cutting torch has been used.
Electrodes such as those shown at 15 in the figure were used. This electrode 15 has both ends of an electrode base 15a (small pillars 15
An electrode hole 15e was bored in the electrode hole 15e, and an electrode material 51 such as zirconium or hafnium was press-fitted into the electrode hole 15e. In addition, 15d is a step part, and this step part 15-
d, the electrode 15 is supported between the gas branch pipe 4 and the electrode holder 6. However, in this type of plasma cutting torch, the electrode material 51 used for the electrode 15 is
However, since the diameter is 1.6 to 2 mm and the length is 3 to 5 mm, and the electrode material 51 is attached to the electrode hole 15e by press-fitting in the axial direction, the electrode material 51 is not deformed. There were various problems in machining, such as making it difficult to press fit, and finishing by cutting and shaping the tip after press fitting, which caused loosening due to the heat effect and falling off when punched.

OBJECTS OF THE INVENTION An object of the present invention is to facilitate the attachment of an electrode material to the tip of the plasma electrode used in a plasma cutting torch, and to prevent the electrode material from falling off the electrode base after processing. The present invention provides a plasma electrode processing method that does not cause such problems.

Embodiments of the Invention Figures 1 to 3 show different embodiments of the invention. FIGS. 1 and 2 show respective electrodes that can be applied to a plasma cutting torch (hereinafter simply referred to as a torch) having the internal structure shown in FIGS. 6 and 7. The electrode 25 shown in FIG. 1 has an electrode base 25a constituted by a flame pillar part 25b and small pillar parts 25c connected to both sides of the flame pillar part 25b.
Electrode holes 25e are bored at both ends of the electrode hole 25e. This electrode hole 25e is machined to be somewhat larger than the electrode material 51. Then, a pre-processed electrode material 51 corresponding to the diameter and depth of the electrode hole 25e is inserted and crimped. Of course, the electrode material 51 is
These include zirconium and hafnium. The electrode 25 shown in FIG. 1 has small pillars 25c on both sides and electrode materials 51 are placed on each side so that when one side is worn out, the direction can be changed and both sides can be used. , electrode 25
This is to double the lifespan. Also in this case, 2
The crimped portion indicated by 5f is exemplified as a rectangular crimped portion. The electrode 35 shown in FIG. 2 is the same as the electrode 2 shown in FIG.
5, the small pillar part 35c is provided only on one side of the flame pillar part 35b, and these constitute the electrode base part 35a.

Then, the electrode material 51 is inserted into the electrode hole 35e and crimped. The crimp portion 35f in this case is shown in a hexagonal shape. Electrodes 25.35 as described in FIGS. 1 and 2
As mentioned earlier, these are designed to be applicable to the torches shown in FIGS. 6 and 7, and for this purpose, stepped portions 25d and 35d are provided, and these 01 portions 25d and 35
d or another side 35d', a gas branch pipe 4. It is held and supported by the electrode holder 6.

The electrode 45 in FIG. 3 has a threaded portion 45 that supports the electrode 45.
This is an example of use in a torch that can be appropriately screwed and supported inside the torch (not shown) by s. Therefore, the first
Like the electrodes 25.35 in FIG.
5d is not required. That is, an electrode hole 45e is provided at one end of the electrode base 45a, and the electrode material 51 is inserted and crimped.
A threaded portion 45s is provided at the other end. The crimp portion 45f is formed by flat diameter portions on two opposing surfaces.

In the embodiment of the present invention, an electrode hole into which an electrode material can be inserted is made in the electrode base, and an electrode material of a predetermined diameter and length corresponding to the depth is inserted and then crimped. Swaging processing or the like may also be used. In short, it is sufficient that flat diameter portions on two or more opposing surfaces are formed by pressure molding and electrode materials are attached.

Effects of the Invention The plasma electrode processing method of the present invention includes pressure molding,
Since it is attached to the electrode material, there is no difficulty in processing unlike press-fitting, and there is no possibility that the punch will fall off after press-fitting. Furthermore, since flat diameter parts are formed on two or more opposing faces, the electrode that is attached by the threaded part has the following characteristics:
The flat diameter portion can be used as a wrench hook, and for this reason, there is an advantage that there is no need to specially process the flat diameter portion.

[Brief explanation of drawings]

4 Figures 1 to 3 show examples of different electrodes processed by the method of the invention. FIG. 4 shows an example of an electrode processed by a conventional method. FIG. 5 is an external view of a plasma cutting torch using the electrode according to the present invention. FIG. 6 is a partial sectional view showing the main part of FIG. 5. 7th
The figure is an exploded perspective view of FIG. 6. 1... Torch body 5, 25, 35.45...
····electrode

Claims (1)

[Claims] An electrode hole into which a predetermined electrode material can be inserted is bored at the tip of the electrode base, and then the electrode material corresponding to the diameter and depth of the electrode hole is inserted, and then the flat diameter of at least two or more opposing surfaces is inserted. 1. A method for processing a plasma electrode, comprising: performing pressure molding to form a portion, and attaching an electrode material to the electrode hole.