JPS6216852A - Device for producing thin sheet - Google Patents

Abstract

PURPOSE:To obtain a thin metallic sheet having high quality while preventing the outflow of a molten metal with a simple construction by disposing an electric conductor in proximity to an endless belt so as to face the surface of said belt along the outside periphery of a molten metal pool on the endless belt. CONSTITUTION:The molten metal stored in a vessel 4 for the molten metal falls, in the form of pouring flow 6, via a pouring nozzle 5 onto the molten metal pool 7 formed on the metallic belt 1. A solidified shell 8 formed by cooling from the belt 1 surface is coiled on a coiler 10. Electric current is supplied from a high-frequency power source 12 to the electrical conductor 11 for generating electromagnetic force installed to enclose the pool 7 on the belt 1, by which the electric currents in the opposite directions are induced in the pool 7. The side edge of the pool 7 receives the repulsive force from the conductor 11 by the cross effect of these two currents, by which the outflow and diffusion of the molten metal pool are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention continuously casts a wide sheet slab by pouring molten metal onto a moving metal belt, cooling and solidifying the molten metal on the belt. It is related to the device.

BACKGROUND OF THE INVENTION Conventional methods for manufacturing thin steel sheets generally include producing a slab with a thickness of 200 to 250 mm from a steel ingot by blooming rolling or continuous casting, and then hot rolling the slab to obtain a thin steel sheet. ·be.

However, these methods require large-scale hot rolling equipment and energy to heat the slab, so the development of technology for directly casting thin sheets has become an important issue.

In order to provide an efficient direct casting method and apparatus for thin sheets, the applicant has already filed a patent application for a method and apparatus for solidifying molten metal on one side on a moving metal belt (Japanese Patent Application No. 188862/1983). ).

In such single-sided solidification casting on a moving metal belt, a possible method is to place a weir that is fixed or moves at a speed synchronized with the surface of the metal belt in order to restrict the area in which the molten metal spreads. , the mechanical equipment to prevent molten metal from being inserted between the metal belt surface and the weir becomes complex and large-scale. To solve this problem, one of the inventors proposed a method and apparatus for controlling the flow area of molten metal using a moving magnetic field instead of a mechanical weir in Japanese Patent Application No. 57-158.
It was proposed in 987.

This invention will be explained with reference to FIG. 6. FIG. 6 is a plan view (the side view is similar to FIG. 1), and through a pulley,
On the surface of the metal bell (1), which is driven to the left and whose left side is inclined upwards, an injection stream 6 of molten metal falls, forming a molten metal pool 7 and its leading edge 7'. The solidified shell 8 is pulled out to the left.

The gist of the invention is that in continuous casting by single-sided solidification of molten metal on a metal plate as described above, a device that generates a moving magnetic field is disposed near the molten metal, and the moving magnetic field causes the molten metal to The idea is to provide electromagnetic force to control the flow range of the fluid in a predetermined area.

However, in this method and apparatus, the coil for generating the moving magnetic field is large-scale and occupies a large area on the metal belt, making it difficult to arrange the coil and the injection device without any problems.

Problems to be Solved by the Invention An object of the present invention is to provide a single-sided solidification type thin plate continuous casting apparatus that solves the above-mentioned problems in the prior art and is capable of producing high quality thin metal sheets with a simple structure. The purpose is to

Means for Solving the Problems In the present invention, in order to solve the problems, a simple electric conductor is used in place of the moving magnetic field generating coil. That is, the present invention provides a thin plate continuous casting apparatus configured to solidify molten metal on one side on an endless metal belt which is inclined so that the casting direction is upward A and is equipped with a cooling device. This is a thin plate casting apparatus in which a conductor is arranged in close proximity to the surface of the endless metal belt along the outer periphery.

The structure of the present invention will be explained below with reference to FIG.

An inclined metal belt 1 rotates around a pulley 2 in the direction of the arrow, and is cooled from below by a cooling device 3.

Molten metal stored in a molten metal container 4 falls through an injection nozzle 5 as an injection stream 6 onto a molten metal pool 7 formed on a metal belt. A solidified shell 8 formed by cooling from the surface of the metal belt is wound around a coiler 10 via a rolling roll 9.

A conductive cable 1 is connected to an electromagnetic force generating conductor 11 installed surrounding the molten metal pool on the belt from a high frequency power source 12.
Electric current is supplied via 3. The length of the electromagnetic force generating conductor along the casting direction may be any length as long as it can cover the leading edge 72 of the molten metal pool.

FIG. 2 shows a plan view of a continuous thin plate casting apparatus according to the present invention.

FIG. 3 shows a sectional view perpendicular to the casting direction of the continuous thin plate casting apparatus according to the present invention.

The high frequency current flowing through the electromagnetic force generating conductor 11 induces a current in the opposite direction in the molten metal pool 7, and due to the interaction of these two types of currents, the side edges of the molten metal pool are drawn away from the electromagnetic force generating conductor 11. The repulsive force prevents the molten metal pool from flowing out and spreading.

In order to insulate between the electromagnetic force generating conductor, the metal belt and the molten metal pool, the surface of the electromagnetic force generating conductor 11 can be coated with an abrasion-resistant, heat-resistant insulating coating 14, as shown in FIG. It may be necessary.

FIG. 5 shows a sectional view of the electromagnetic force generating conductor 11.

In order to cool the electromagnetic force generating conductor 11, it may be necessary to flow the cooling water 16 inside the insulating coating 15.

EXAMPLE The following experiment confirmed that the flow zone of a molten metal pool can be regulated by the method of the present invention.

Molten metal: Low melting point alloy (Pb, Sn, Bi) melting point 100℃, injection temperature 130"0 Base: Metal plate (6
mm thickness) Inclination angle 2° Rating: 20V, 800A, 2KHz Approximately 6 under these conditions
It was possible to stop the flow of 1 kg of low melting point alloy.

Effects of the Invention According to the present invention, high-quality thin metal plates can be continuously cast with a simple structure while preventing molten metal from flowing out, so the effects of the invention are significant.

[Brief explanation of drawings]

Fig. 1 is an elevational view of an embodiment of the present invention, Fig. 2 is a plan view thereof,
FIG. 3 is a sectional view perpendicular to the casting direction of the apparatus shown in FIG. 1;
FIG. 4 is a vertical sectional view showing another embodiment of the present invention, and FIG.
The figure is a sectional view of the electromagnetic force generating conductor 11 of the present invention, and FIG. 6 is a plan view of the prior art. 18 fists/metal belt, 2 e e pulleys, 3ψ...
Cooling device, 4... Molten metal container, 5 fist φ injection nozzle, 6... Injection flow, 7... fist molten metal pool (pool)
, 8...solidified shell, 9φ working rolling roll lQ**
*Coiler, 11@--Conductor for electromagnetic force generation, 12...
High frequency power supply, 13... Conductive cable, 14. ψΦ wear-resistant and heat resistant insulation coating, 15 φ.. Insulating coating, 16. Life φ cooling water, 20.. Moving magnetic field generator for edge control, 21.
... Moving magnetic field generator for trailing edge control, 72・Fist・Leading edge of molten metal pool.

Claims (1)

[Claims] In a thin plate continuous casting device that solidifies molten metal on one side on a moving metal belt, a conductor is disposed close to the surface of the metal belt along the outer circumference of a molten metal pool on the metal belt, and a conductor is placed close to the surface of the metal belt. A thin plate casting device characterized by holding molten metal by electromagnetic force generated by a flowing high-frequency current and preventing the molten metal from flowing out.