JPH0735553B2 - Method for manufacturing electrode for remelting electroslag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing an electrode for remelting electroslag (hereinafter referred to as an ESR electrode), and particularly to a manufacturing method capable of reducing the manufacturing cost.

[Conventional technology]

The ESR electrode is held by the stub. That is,
As shown in FIG. 3, the ESR electrode 2 is tightly connected to the stub 4, the stub 4 has a function of holding the electrode 2 and conducting electricity, and the stub 4 is generally connected to the electrode 2 having various diameters. Is smaller than the diameter of the electrode 2 to be melted.

Conventionally, two methods are mainly used to connect the electrode 2 and the stub 4. One of them is the electrode 2 as shown in FIG.
Is machined to form the groove portion 6, and is fastened with the flange 8 and the bolt 10. The disadvantage of this method is that the machining is very costly.

Another method is to weld and connect the stub 4 and the electrode 2 each time they are melted, as shown in FIG. However, this method has a drawback that it cannot be applied to materials having poor weldability such as high C and high Cr materials.

In addition, Japanese Patent Publication No.
No. 17 is known, but it is similar to the method of FIG. 3 in that threading is required and the cost is considerable.

[Problems to be solved by the invention]

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a method for manufacturing an ESR electrode, which is inexpensive and can be reliably connected to a stub without requiring machining, regardless of the electrode material.

[Means for solving problems]

The gist of the present invention is as follows. That is, in a method for manufacturing an electroslag remelting electrode, in which a flange is fitted in a horizontal groove provided on the upper part of the electrode, and the flange and the stub are fastened with a bolt, the electrode and the flange having the shape of the groove are formed. Pre-molding a mold equipped with a current-carrying iron ring sandwiched between,
The electroslag re-forming process comprises the steps of: assembling the surface plate and the mold by incorporating the mold therein; and pouring the electrode by pouring molten metal into the assembled surface plate and the mold. It is a manufacturing method of a melting electrode.

The details of the present invention will be described with reference to the embodiment shown in FIG.
A mold 14 for forming the groove portion 6 of the electrode 2 is formed in advance.
This mold 14 is made of sand, wood, refractory, etc., and is easily dismantled after casting. When the electrode 2 after casting is turned upside down, the upper part of the electrode 2 is different from the conventional electrode 2 shown in FIG. Groove 6 of the same type
The structure has Also, the mold 14 is, as shown in FIG.
A ferrous iron ring 16 is attached to an upper portion of the inner surface, that is, a portion sandwiched between the electrode 2 and the flange 8 when connected to the stub 4. The current-carrying iron ring 16 needs to have a thickness of 5 mm or more and have a smooth display.

Next, the mold 22 is assembled while the mold 14 is incorporated into the surface plate 20 provided with the runner 17 and the riser 18. When the mold 22 spreads upward, it is necessary to take measures to prevent the mold 14 from floating during casting.

When the assembling of the mold 22 is completed as described above, the molten metal is poured into the mold 22 through the runner 17 and the run-up 18, and the electrode 2 is cast.

[Action]

When the cast-in electrode 2 is removed from the mold 22 and the surface plate 20, the manufactured electrode 2 has a groove portion 6 for flange fastening at the upper part without being machined, and a current-carrying iron ring 16 is welded. ing. Therefore, the electrode 2 of the present invention can be fastened to the stub 4 with the bolt 10 as shown in FIG. 2 without any processing, and the iron ring 16 for electric current application having a smooth surface has one side electrode. Since it is welded to No. 2 and can contact the flange 8 on the other side, it can be connected to the stub 4 with the same electrical conductivity as when the conventional upper part is machined.

〔The invention's effect〕

The present invention, by casting the ESR electrode using a mold for mounting a current-carrying iron ring and forming a groove portion for flange fastening on the electrode upper part, at low cost without performing machining,
It was possible to manufacture an ESR electrode that has the same level of electrical conductivity as when subjected to conventional machining and can be connected to a stub.

[Brief description of drawings]

FIG. 1 is a sectional view of a casting apparatus used in an embodiment of the present invention, FIG. 2 is a sectional view showing a connection between an electrode and a stub in the embodiment of the present invention, and FIGS. 3 and 4 are all conventional electrodes. Fig. 3 is a cross-sectional view showing a method of connecting the stub and the stub. Fig. 3 shows a flange bolt method and Fig. 4 shows a welding method. 2 ... Electrode, 4 ... Stub 6 ... Groove, 8 ... Flange 10 ... Bolt, 14 ... Mold 16 ... Conductive iron ring, 20 ... Surface plate 22 ... Mold

Claims (1)

[Claims] 1. A method of manufacturing an electrode for remelting electroslag, wherein a flange is fitted in a horizontal groove provided on an upper portion of the electrode, and the flange and the stub are fastened with a bolt.
Pre-molding a mold having an energizing iron ring sandwiched between the electrode and the flange and having the shape of the groove, and assembling the platen and the mold by incorporating the mold inside, A method of manufacturing an electrode for remelting electroslag, comprising the steps of pouring molten metal into an assembled surface plate and a mold to cast the electrode.