JP2889929B2 - Magnetic levitated continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a magnetic levitation continuous casting apparatus.

(Prior Art) It is known to produce a wire or a bar made of, for example, Al or Cu by continuous casting means (Japanese Patent Laid-Open No. 59-133958, etc.). That is, the molten metal is supplied to the upper casting or molding section from the lower side as a molten metal column, and is cooled and solidified sequentially while being moved in the casting or molding section by being exposed to an alternating magnetic field. The magnetic levitation continuous casting method, which is taken out from the upper part of the forming section, has been put to practical use as an industrially effective means. That is, according to the magnetic levitation continuous casting method, the molten metal column to be cast or formed exhibits a zero-gravity state in the alternating magnetic field. This is because not only the operation is reduced, but also there is an advantage that the molten metal column is internally agitated at the stage of passing the alternating magnetic field and exhibits a high degree of homogeneity.

On the other hand, as an apparatus for carrying out the above-mentioned magnetic levitation continuous casting method, there is known a magnetic levitation continuous casting apparatus in which a main part configuration is shown in cross section in FIG. A molten metal holding furnace 2 for containing and holding the molten metal 1; a cylindrical casting vessel 3 placed upright to receive the molten metal 1 in the form of a molten metal column for solidification; Heat exchange means incorporated in the casting vessel 3 for cooling and solidifying the molten metal column introduced into the vessel 3, and alternating magnetic field generating means for generating an alternating magnetic field for electromagnetically moving the molten metal column upward;・
A means for taking out the solidified casting from the upper part of the casting vessel 3; a molten metal supply passage 4 for supplying the molten metal 1 to be cast from the molten metal holding furnace 2 into the casting vessel 3 from below; And a displacer 5 for pressing the molten metal 1 in the molten metal holding furnace 2 and supplying the molten metal 1 to the casting vessel 3 through the molten metal supply path 4. An apparatus comprising the above is put into practical use. The heat exchange means for cooling and solidifying the molten metal column introduced into the casting container 3 and the alternating magnetic field generating means for electromagnetically moving the molten metal column upward are incorporated into the casting container 3 as follows. ing. That is, a heat exchange means, for example, a cooling medium flow path and an alternating magnetic field generating means for generating an alternating magnetic field are coaxially arranged on substantially the entire outer peripheral surface of the casting container body. Further, the molten metal 1 to be cast from the molten metal holding furnace 2 is placed in a casting vessel 3.
A molten metal supply passage 4 for supplying the molten metal from below is formed to protrude from a side wall near the bottom of the molten metal holding furnace 2 and includes a horizontal portion 4a, a rising portion 4b, and a connecting portion 4c connecting these. I have.

(Problems to be Solved by the Invention) However, the magnetic levitation continuous casting apparatus having the above configuration has the following inconveniences, and improvement thereof is desired. That is, the molten metal supply path 4 for supplying the molten metal 1 to be cast from the molten metal holding furnace 2 into the casting vessel 3 from below is provided in such a manner that the molten metal is continuously maintained in the casting vessel while maintaining a required molten state. In this case, a graphite tube having good conductivity is used, and high-frequency heating means is arranged on the peripheral wall. By the way, the graphite pipe constituting the molten metal supply path 4 is inferior in durability, such as being oxidized and oxidized with oxygen in the air or the molten metal. There is a problem that road repair / replacement work is required. That is, in the repair / replacement work of the molten metal supply path 4, there are many connection points such as a connection between the horizontal part 4a and the molten metal holding furnace 2 and the connection part 4c, and a connection between the rising part 4b and the connection part 4c. In addition, there is a problem that not only the work is complicated but also the possibility of leakage of the molten metal (hot water) 1 is high. Thus, the possibility of the molten metal 1 leakage is promoted even when the required casting operation is not performed, because the hydrostatic pressure of the molten metal 1 is applied to the connection points. Moreover,
In the repair / replacement work of the molten metal supply path 4,
It is necessary to discard or collect the molten metal 1 in the molten metal holding furnace 2, and there is a problem in terms of efficiency such as waste of raw materials.

The present invention has been made in view of the above circumstances, and can reduce or suppress the leakage of molten metal (hot water) from a molten metal supply path, and can reduce the complexity of repair / replacement work of the molten metal supply path 4. On the other hand, an object of the present invention is to provide a magnetic levitation continuous casting apparatus that does not require the operation of discarding or collecting the molten metal 1 in the molten metal holding furnace 2.

[Constitution of the Invention] (Means for Solving the Problems) In the magnetic levitation continuous casting apparatus having the above constitution, the present invention supplies a molten metal to be cast from a molten metal holding furnace into a casting vessel main body from below. When the displacer is pulled up from the molten metal, the cylindrical molten metal supply passage is projected and arranged almost horizontally on the molten metal holding furnace side wall above the molten metal surface, and a slight It is characterized in that it is configured to be connected to the casting container body at the rising portion.

(Operation) According to the present invention, since the molten metal supply path has no connection portion, the problem of molten metal leakage can be largely solved. In addition, the molten metal supply path is disposed relatively above the molten metal holding furnace, and when the casting operation is stopped (No Cast), hydrostatic pressure due to the molten metal is applied to the molten metal supply path. Therefore, not only does the risk of the molten metal leak occur, but also in the case of maintenance of the molten metal supply path, the molten metal in the molten metal supply path is collected in the molten metal holding furnace, and the molten metal is held. The required maintenance can be achieved without discarding the molten metal in the furnace.

Embodiment An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a cross-sectional view showing a main part of a magnetic levitation continuous casting apparatus according to the present invention. In FIG. 1, reference numeral 2 denotes a molten metal holding furnace for containing and holding molten metal 1; It is a casting container received from below in the form of a metal column. Thus, the casting container 3 is provided with an alternating magnetic field which is disposed on the outer periphery of the casting container body and generates an alternating magnetic field for electromagnetically moving the molten metal column received in the casting container body. Generating means and a molten metal column which is integrally disposed on the outer periphery of the casting container main body (inside the alternating magnetic field generating means), is received in the casting container main body, and moves upward by the action of the alternating magnetic field generating means. A cooling means for cooling and solidifying, for example, a cooling water passage. Reference numeral 4 denotes a molten metal supply passage for supplying the molten metal 1 to be cast from the molten metal holding furnace 2 into the casting vessel 3 from below, and the molten metal supply passage is provided with a displacer 5 pulled up from the molten metal 1. In this case, the molten metal holding furnace 2 is disposed so as to project substantially horizontally from the side wall of the molten metal holding furnace 2 above the surface of the molten metal 1 and is connected to the casting vessel 3 with a slight rising portion 4c. The molten metal holding furnace 2 is provided with a high-frequency heating means on its peripheral wall to keep the molten metal 1 housed and held therein in a molten state, and to supply the molten metal supply path 4 in a required molten state. I have.

In the magnetic levitation continuous casting apparatus according to the present invention, a molten metal supply path 4 called a launder tube for supplying the molten metal 1 to be cast from the molten metal holding furnace 2 to a casting vessel 3 called a reviator is provided by: In addition to the above graphite, ceramics having electrical conductivity sufficient for high-frequency heating, but having heat resistance and mechanical strength enough to withstand molten metal, such as TiB ₂ , ZrB ₂ , HfB ₂ , MoB ₂ , boride-based ceramics such as CrB _2, TiN, ZrN, NbN, nitride ceramics and ZrC such VN, HfC, VC, may be constituted by a carbide ceramic such as TiC.

Next, referring to FIG. 2, an operation or a method of using the magnetic levitation continuous casting apparatus according to the present invention having the above-described configuration will be described. First, the molten metal holding furnace 2, the casting vessel 3, and the molten metal supply path 4 are prepared so that required continuous casting can be performed.
Set. Next, the displacer 5 is driven, and the displacer 5 is sequentially immersed in the molten metal 1 in the molten metal holding furnace 2. By the immersion operation of the displacer 5, the surface of the molten metal 1 is sequentially raised and supplied to the casting container 3 through the molten metal supply path 4, and a predetermined magnetic levitation continuous casting is performed. On the other hand, when the displacer 5 is pulled out of the molten metal 1 by the end or stop of the casting operation, the surface of the molten metal 1 in the molten metal holding furnace 2 is lowered and the molten metal 1 in the molten metal supply path 4 is melted. The metal flows down and is collected in the molten metal holding furnace 2.

As described above, except for the required continuous casting operation, that is, when the continuous casting operation is stopped, the application of the hydrostatic pressure due to the molten metal to the connection portion of the molten metal supply passage 4 and the like is completely avoided. The problem of leakage is largely eliminated. In addition, even when the molten metal supply path 4 is maintained, the molten metal 1 is collected in the molten metal holding furnace 2. Further, since the molten metal supply path 4 is protruded relatively above the molten metal holding furnace 2, it is not necessary to discard the molten metal 1 during maintenance of the molten metal supply path 4.

[Effects of the Invention] As can be seen from the above description, according to the magnetic levitation continuous casting apparatus of the present invention, the molten metal supply path system that supplies the molten metal to be cast from the molten metal holding furnace to the casting vessel body. Since the molten metal does not accumulate when casting is stopped, maintenance of the molten metal supply path is facilitated. Moreover, since the molten metal supply path has no intermediate connection part,
The possibility of occurrence of molten metal leakage at the connection portion is reduced. That is, when the casting is stopped, the molten metal supply path system is not subjected to the hydrostatic pressure due to the molten metal, so that not only the risk of molten metal leakage at the connection portion and the like can be largely avoided, but also the molten metal supply path can be removed. In the replacement operation, it is not necessary to dispose of the molten metal in the molten metal holding furnace. Thus, it can be said that the magnetic levitation continuous casting apparatus according to the present invention provides many practical advantages such as safety of operation or operation, ease of maintenance, and effective (efficient) use of molten metal for casting.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a main part of a magnetic levitation continuous casting apparatus according to the present invention. FIG. 2 is a cross-sectional view schematically showing an example of use of the magnetic levitation continuous casting apparatus according to the present invention. FIG. 3 is a cross-sectional view showing a main configuration of a conventional magnetic levitation continuous casting apparatus. 1 ... molten metal 2 ... molten metal holding furnace 3 ... casting vessel 4 ... molten metal supply path 4a ... horizontal part of molten metal supply path 4b ... ... rising part of molten metal supply path 4c ... supply of molten metal Road connection 5: Displacer

Claims (1)

(57) [Claims] 1. A molten metal holding furnace for containing and holding a molten metal, a casting container body for receiving the molten metal from below in the form of a molten metal column, and integrally disposed on an outer periphery of the casting container body. And, an alternating magnetic field generating means for generating an alternating magnetic field for electromagnetically moving the molten metal column received in the casting container body, and disposed integrally on the outer periphery of the casting container body,
Cooling means for cooling and solidifying the molten metal column received in the casting vessel body and moving upward by the action of the alternating magnetic field; and a molten metal to be cast from the molten metal holding furnace into the casting vessel body from below. A molten metal supply path to be supplied, a high-frequency heating means disposed on a peripheral wall of the cylindrical molten metal supply path, and a casting vessel which presses the molten metal in the molten metal holding furnace and passes through the molten metal supply path. A magnetic levitation type continuous casting apparatus comprising a displacer having an action of supplying the molten metal into the molten metal supply path, wherein the molten metal supply path extends from the molten metal holding furnace side wall above the molten metal surface when the displacer is pulled up from the molten metal. A magnetic levitation type continuous casting apparatus characterized in that it is protruded substantially horizontally and is connected to the casting vessel main body at a slight rising portion without going through a connection portion.