JPH0125382B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to ESR (Electro Slag Remelting).
Refining method (hereinafter sometimes simply referred to as ESR method)
This invention relates to an improvement in a holding device for holding consumable electrodes and stubs used in.

Conventionally, as one of the methods for refining metals, the ESR method is known, in which the metal to be refined is shaped into a rod and the rod is used as a consumable electrode for refining. In this ESR method, a consumable electrode is placed vertically in a copper crucible, and its lower end is brought into contact with the slag in the copper crucible.
Then, the consumable electrode itself is gradually melted and refined from its lower end upward by the slag heat. Therefore, in this ESR method, it is necessary to lower the consumable electrode or raise the copper crucible as the consumable electrode wears out. Further, in order to prevent the consumable electrode from shooting against the side wall of the copper crucible, it is necessary to set the consumable electrode itself vertically within the copper crucible.

By the way, metals that are generally refined using the ESR method are often expensive. For this reason, all of the consumable electrodes are refined by welding a stub to one end of the consumable electrode, and holding the stub so that the consumable electrode is suspended in a copper crucible. However, when welding a stub to a consumable electrode, it is difficult to align the axes of the stubs, and as a result, the axes of the stubs are often bent or misaligned during welding. On the other hand, the ESR method requires a large current to flow;
Conventionally, as a holder for holding a stub, a wide semi-cylindrical holder as shown in FIG. 1 or 2 has been used. That is, the holder shown in FIG. 1 holds the stub 3 by tightening both ends of two separate semi-cylinders 1, 1 with bolts 2, 2, respectively, and the holder shown in FIG. The stub 3 is held by tightening the other ends of the half cylinders 1, 1 which are connected by a pin with a bolt 2. Since the wide semi-cylinders 1 and 1 are used as holders in this way, if the axes of the stub 3 and the consumable electrode are bent or misaligned and their straightness is poor, the consumable electrode cannot be hung vertically. It was extremely difficult to do so.

This invention was made in consideration of the above circumstances, and even if the straightness of the stub and the consumable electrode is poor, the consumable electrode can be hung vertically easily and in a short time, and a large current can flow without any problem. suitable for
The purpose of the present invention is to provide a holding device for consumable electrodes and stubs in the ESR refining method.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

The main parts of this device are the holding part A of the consumable electrode 11 and the stub 12 located below in FIG.
However, in addition to this, there is also a mounting part B for attaching this holding part A, and an operating part for operating the holding part A when attaching the consumable electrode 11 and stub 12 on this mounting part B. There is C. Here, each part will be explained in turn.

[About holding part A]

This holding part A has a major feature in that it can flow a large current for refining without any trouble by holding the consumable electrode 11 and the stub 12 in close contact by utilizing the boosting effect of the wedge. In this case, the wedge corresponds to a plurality of conductive chucks 16 surrounding the stub 12.
It is.

In the figure, reference numeral 13 denotes a conductive cylinder having an opening 14 at its lower end, and a tapered portion 15 that widens upward from the opening 14 is provided on its inner peripheral surface. This tapered portion 15 has three or more conductive chucks 16.
are arranged radially, thereby forming a group of conductive chucks for holding the stub 12. The outer surface of each chuck 16 has a shape corresponding to the tapered portion 15, and the inner surface thereof has a shape corresponding to the outer peripheral surface of the stub 12. Each chuck 16 is held by a holding member 17 located within the inner space S of the cylindrical body 13. Holding member 17
has a headed cylindrical shape with an open bottom end, and a substantially rectangular mounting hole 17a into which each chuck 16 is slidably mounted is formed in its side wall. This mounting hole 1
The lower end surface of each chuck 7a is inclined upward toward the inside, so that each chuck 16 is always in contact with the tapered portion 15. When the holding member 17 moves up and down, each chuck 1
6 slides along the tapered portion 15 so that the inner diameter formed by the chuck group changes.

[About mounting part B]

This attachment part B is for attaching the aforementioned holding part A, and after attachment, both parts A and B are integrated.

In the figure, reference numeral 18 denotes a cylindrical shaft that supports the entire device, and the upper part of the cylindrical body 13 is screwed into the lower end of the shaft and then welded and fixed thereto. The cylindrical shaft 18 is partially supported by an electricity introduction section 19 that is moved up and down by an elevating means (not shown). Then, a large current for refining is applied to the electricity introduction part 1 as shown by the arrow.
9, flows through the cylindrical shaft 18, the cylinder body 13, and the chuck 16 to the stub 12, and further flows to the consumable electrode 11. At this time, the cylinder 13 and each chuck 16 and each chuck 16 and stub 1
2 are in close contact with each other due to the boosting effect of the taper, so that when a large current flows, contact resistance is small, good current conduction is achieved, and power loss is reduced.

[About operation part C]

This operation part C includes a consumable electrode 11 and a stub 12.
The stub 12 is provided with a screw mechanism for vertically moving the holding portion 17 when the stub 17 is attached, and a press rod mechanism for pressing the head of the stub 12 after attachment to make the stub 12 more securely held.

A bearing 21 is attached above the cylindrical shaft 18 via a flange 20. A large handle 22 is attached to a bolt 23 on the bearing inner ring 21a of this bearing 21.
It is fixed by. A pipe 24 is slidably screwed into the center of the large handle 22, and is held so as to slide up and down but not rotate with respect to the cylindrical shaft. This pipe 24
penetrates the cylindrical shaft 18 and attaches its lower end to the holding member 1
It is fixed at the top of 7. Therefore, when the large handle 22 is turned, the pipe 24 moves up and down relative to the cylindrical shaft 18, and thereby the holding member 17 moves up and down relative to the cylindrical body 13. Further, a screw 24a is provided on the inner periphery of the upper end of the pipe 24, and a press rod 25 is screwed into this screw 24a. The pressing rod 25 passes through the pipe 24, the cylinder 13, and the holding member 17, and its lower end portion is located inside the holding member 17. Further, a small handle 26 is attached to the upper end of the press rod 25, and when the small handle 26 is turned, the press rod 25 moves up and down with respect to the pipe 24, thereby pushing the head of the stub 12. It is designed so that it can be pressed.

Next, a case will be described in which the consumable electrode 11 and the stub 12 are held using a holding device configured as follows.

First, turn the small handle 26 to pull the push rod 25 upward. Then, when the large handle 22 is turned and the holding member 17 is pulled up, the chuck 1
6 is raised along the tapered portion 15 of the cylindrical body 13 until the virtual inner diameter formed by the chuck 16 becomes larger than the diameter of the stub 12, after which the stub 12 is inserted therein. Next, while keeping the stubs 12 inserted into the chucks 16, turn the large handle 22 to lower the holding member 17.
, thereby reducing the imaginary inner diameter formed by the chuck 16. The stub 12 is then lowered and held in the chuck 16. Here, if the axes of the consumable electrode 11 and the stub 12 are bent, when the consumable electrode 11 is pushed in the direction to correct the bend, only the chuck 16 to which the load is applied bites into the stub 12, and this Adjust the consumable electrode 11 so that it hangs vertically. On the other hand, if the axis of the consumable electrode 11 and the axis of the stub 12 are misaligned, when the holding member 17 is pulled upward and the stub 12 is inserted into the chuck 16 as described above, the consumable electrode 11 and the stub The consumable electrode 11 is moved in a predetermined direction by an amount corresponding to the amount of deviation of each axis with respect to the stub 12, and the holding member 17 is lowered to lower the chuck 16 by the gap between the chuck 16 and the stub 12. Electrode 1
1 so that it hangs vertically at a predetermined position. After this, turn the small handle 26 to release the pressure rod 25.
When the pressure rod 25 is lowered, the lower end of the pressure rod 25 presses against the upper end of the stub 12, thereby bringing the stub 12 into closer contact with the chuck 16, thus causing the consumable electrode 11
Then, the installation of the stub 12 is completed.

In addition, when removing the consumable electrode 11 and the stub 12, the procedure may be reversed to that described above, and a detailed explanation thereof will be omitted.

Furthermore, in the above embodiment, both the inner circumferential surface of the cylindrical body 13 and the outer circumferential surface of the stub are provided with a taper, but a configuration in which only one of these is provided with a taper may also be used. It is not limited to. Further, in the above embodiment, a case was shown in which the stub 12 was attached to the consumable electrode 11, but it goes without saying that as a special embodiment, the consumable electrode 11 may be directly held in the apparatus of the present invention.

As explained above, according to the consumable electrode and stub holding device in the ESR refining method of the present invention, three or more conductive chucks 16 are provided in the conductive cylinder 13 so as to be individually slidable, and ,
The inner surface of the chuck 16 has a shape corresponding to the outer circumferential surface of the stub 12, and the outer surface has a shape corresponding to the tapered part 15 of the conductive cylinder 13, and the chuck 16 holds the stub 12 so that the cylinder 13 and Since the structure is such that a large current is passed through the chuck 16 to the stub 12 and the consumable electrode 11, even if the consumable electrode 11 and the stub 12 are not straight, each chuck 16 can be cut into the stub 12. Alternatively, by changing the vertical position of the chuck 16, the consumable electrode 11 can be vertically hung easily and in a short time, and the boosting action of the tapered portion 15 allows each chuck 16, the cylindrical body 13, and each Since the chuck 16 and the stub 12 have good adhesion, it is suitable for passing a large current without any trouble.

Further, by providing a screw mechanism for vertically moving the holding member 17 and a pressing rod 25 for pressing the upper end of the stub 12, the stub 12 can be held in the chuck 16 even more easily, and the consumable electrode 11 And the stub 12 can be held more reliably.

[Brief explanation of drawings]

1 and 2 are schematic diagrams showing a conventional consumable electrode and stub holder, respectively, FIG. 3 is a partially omitted longitudinal sectional front view showing an embodiment of the present invention, and FIG. 4 is the same as that shown in FIG. - Sectional view along the line, Figure 5 is the 3rd
FIG. 2 is a cross-sectional view taken along line - in the figure. A...Holding section, B...Mounting section, C...Operation section,
S...Space, 11...Consumable electrode, 12...Stub, 13...Cylinder, 14...Opening, 15...Tapered portion, 16...Chuck, 17...Holding member,
18... Cylindrical part, 19... Electric introduction part, 22...
Large handle, 24...pipe, 24a...screw,
25...pressing rod, 26...handle.

Claims (1)

[Claims] 1. When refining a metal, the metal is made into a rod shape and the metal itself is used as a consumable electrode for refining.
A cylindrical shaft 1 having an electricity introduction part 19, which is a large current conductive holding device used to hold a consumable electrode and/or a stub in the ESR refining method.
8, a conductive cylindrical body 13 provided at the lower end of the cylindrical shaft 18, and having a tapered portion 15 on its inner peripheral surface that widens upward from the opening 14 at the lower end;
The stub 1 is located within the inner space S of this cylinder 13.
3 or more conductive chucks 1 holding the outer circumference of 2
6 and a holding member 17 for holding each chuck 16, each chuck 16 is arranged radially outside the stub 12 and is held slidably in the radial direction with respect to the holding member 17, Its inner surface is shaped to correspond to the outer periphery of the stub 12, and its outer surface is shaped to correspond to the tapered part 15. A device for holding consumable electrodes and stubs in an ESR refining process, characterized in that the consumable electrodes and/or the consumable electrodes 11 are allowed to flow through the chuck 16 circuit. 2. When refining metal, the metal is made into a rod shape and used as a consumable electrode for refining.
A cylindrical shaft 1 having an electricity introduction part 19, which is a large current conductive holding device used to hold a consumable electrode and/or a stub in the ESR refining method.
8, a conductive cylindrical body 13 provided at the lower end of the cylindrical shaft 18, and having a tapered portion 15 on its inner peripheral surface that widens upward from the opening 14 at the lower end;
The stub 1 is located within the inner space S of this cylinder 13.
3 or more conductive chucks 1 holding the outer circumference of 2
6, a holding member 17 which holds each chuck 16 and which itself is moved up and down by a screw mechanism, and a pressing rod 25 which penetrates the cylindrical shaft 18 and the cylinder body 13 and presses the head of the stub 12. Each chuck 16 is arranged radially around the outer periphery of the stub 12 and is held slidably in the radial direction with respect to the holding member 17, and the inner surface thereof has a shape corresponding to the outer periphery of the stub 12. , its outer surface has a shape corresponding to the tapered part 15, and the electricity introduction part 19 and the cylindrical shaft 1.
A large current for refining flowing from 8 is caused to flow into the stub 12 and/or the consumable electrode 11 via the circuit of the cylinder 13 and the chuck 16.
Holding device for consumable electrodes and stubs in ESR refining process.