JPS6031585B2 - Molten metal stirring device in continuous casting equipment - Google Patents

Abstract

1. Apparatus for stirring metal melts in continuous casting plants during the solidification process by means of a constant magnetic field which passes through the string (2), which is guided between rollers (3), at right angles to the direction of movement of the string, and which also cuts a constant current which is passed through the string (1) at right angles to the direction of movement thereof and to the constant field, in which the yoke (6) of an electromagnet (4) which produces the constant field, is arranged on the wide side of the string outside the guide rollers (3), and the magnetic poles are each provided with a pole shoe (9) embracing at least one of the guide rollers (3), whilst on the other wide side of the string (1), there is arranged a return armature (5) having correspondingly designed poles (11) and in which, in order to supply the constant current, contact brushes or contact rolls, which can be directly pressed against the narrow sides of the surface of the string, are provided, characterised in that on the yoke (6) of the electromagnet (4), there are arranged two magnetic systems, the field coils (7) of which produce oppositely-directed magnetic fields.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides for penetrating a coin guided between guide loaves during the solidification process of continuous casting perpendicular to the direction of its movement;
and an electromagnetic yoke generating a direct current magnetic field intersecting a direct current passed through the coin piece also perpendicular to its direction of movement is arranged outside the guide roller on one wide side of said mirror piece, and Each of its magnetic poles is provided with a magnetic pole piece that embraces at least one of said guide lobes, while on the other opposite side of the mirror piece there is arranged a return core part having a magnetic pole formed corresponding to said magnetic pole; and relates to a barrel layer of molten metal in a continuous casting installation, which is provided with contact brushes or contact rollers that are pressed directly against the outer surface of the coins for the purpose of passing a direct current.

In the previously proposed device of this type described in the specification of the special specification No. 55-6165, the mainstream field of the molten metal is generated by the electromagnetic field of the liquid molten metal that has not yet solidified inside the mirror piece. It consists of a current and a flow based on convection, and is asymmetrical with respect to the axis of the coin.

As a result, an asymmetry occurs in the structure of the mirror piece. In addition, it is also possible for iron members, such as the supports of guide rollers, which are magnetically coupled to each other and run symmetrically with respect to the length of the magnet arrangement, to assist in the formation of a strong stray magnetic field. The object of this invention is to make the flow field of molten metal inside the key piece symmetrical with respect to the axis of the mirror piece, and to eliminate the harmful influence of iron members.

The above-mentioned object is achieved according to the invention in the above-mentioned device in that two magnet systems are arranged in the yoke of the electromagnet and the excitation coils of these magnet systems generate magnetic fields of opposite polarity. .

Due to the magnetic field of opposite polarity, a main stream of molten metal is generated in the direction of the longitudinal axis of the mirror piece and symmetrically about the axis of the bracket.

The iron members passing symmetrically with respect to the longitudinal axis of the coin are located at the same magnetic potential, so that no compensating magnetic flux appears. Next, details of the invention will be explained based on embodiments shown in the drawings.

Figure 1 shows coin coins 1 in the Kyoyoso layer of continuous casting equipment.
represents a horizontal cross-sectional view of.

In this figure, the core portion 2 of the coin 1, which is supported on its two wide sides by guide rollers 3, is still in liquid form. An electromagnet 4 having a return iron core portion 5 is arranged in this portion. Two excitation coils 7 wound in opposite directions are provided on the yoke 6 of the electromagnet, and these excitation coils generate magnetic fields of opposite polarity. Two magnetic poles having the same symbol and located adjacent to each other in the two magnet systems configured in this manner are combined into a common magnetic pole leg 8. As is clear from FIG. 2, the pole leg 8 branches into a plurality of pole pieces 9, and the spacing between the pole pieces is adapted to the diameter of at least one guide roller, and the distance between the pole pieces 9 is adjusted to the diameter of at least one guide roller. at least one guide roller 3 is held in each case.

In the same way, the central leg 10 of the return iron section also has a plurality of magnetic pole pieces 11.
branch to. Similarly, the outer magnetic pole 12 of the electromagnet 4,
13 and the corresponding return iron D section 5 magnetic poles each have a plurality of magnetic pole pieces on one leg. Not shown in FIG. 1 are the contact rollers or contact brushes arranged on the narrow sides of the coin and for conducting the direct current which, in cooperation with the magnetic field, produces the damming effect.

Due to the magnetic field of opposite polarity of the electromagnet, a partial flow is formed in the core of the still liquid coin, which partial flow exits in the region of the central leg 8, e.g. marked with a plus sign, above the plane containing the drawing. It is also indicated by a minus sign and joins the main stream flowing from top to bottom of the plane containing the drawing. This main stream then flows symmetrically to the longitudinal axis of the coin. By branching the central leg 8 and the corresponding leg 10 of the return core into a plurality of pole pieces, the magnetic field is adapted to the streamline bulge in the center of the sickle piece. As a result, the efficiency of the poetics device is significantly improved. The guide roller 3 located within the field of action of the electromagnetic system is preferably made of a non-magnetic material. This allows the lines of magnetic force emerging from the pole piece to pass through the mirror piece without being affected by the presence of the guide roller. The supports 16 of the guide rollers, which are arranged symmetrically with respect to the longitudinal axis of the coin and are interconnected via the main frame, lie at the same potential as a result of the opposite magnetism of the magnetic fields.
As a result, no unnecessary stray magnetic flux is generated. The use of an electromagnet with two oppositely wound coils to generate magnetically opposed magnetic fields makes the present Roku-Azusa apparatus suitable for the production of slabs with different dimensions without any further modification. Provides the advantage of being usable.

As explained above, this invention penetrates the rust piece guided between the guide rollers during the solidification process perpendicularly to the direction of movement of the rust piece, and passes the rust piece through the rust piece perpendicularly to the direction of movement of the rust piece. A yoke of an electromagnet generating a steady magnetic field intersecting the applied direct current is arranged outside the guide rollers on one wide side of said coin, and at least one of said guide rollers is attached to each of its magnetic poles. A magnetic pole piece is provided to hold the coin piece, and a return iron core portion having a magnetic pole formed corresponding to the magnetic pole is disposed on the other wide side of the coin piece, and a return iron part having a magnetic pole formed in correspondence with the magnetic pole piece is disposed on the other wide side of the coin piece. In direct casting of molten metal in continuous casting equipment, which is provided with contact brushes or contact rollers pressed against the surface, two magnet systems are arranged in the yoke of the electromagnet, and the excitation coils of these magnet systems generate magnetic fields of opposite polarity. This has the effect of making the flow field of the molten metal inside the mirror piece symmetrical with respect to the axis of the strand and eliminating the harmful influence of the iron member.

[Brief explanation of the drawing]

FIG. 1 shows a horizontal cross-sectional view of a strand in a part of the pouring device of the present invention in a continuous casting facility, and FIG.
The figure shows a cross-sectional view along the cutting line D-0 shown in FIG. 1... Slab, 3... Guide roller, 4...
...Electromagnet, 5...Return iron core, 6...Yoke, 7...Exciting coil, 8...Magnetic pole leg, 9,
11...Magnetic pole piece, 10...Central leg of return iron core. F/6. No F/Evening. 2

Claims (1)

[Scope of Claims] 1. In the process of continuous casting, a slab that is guided between guide rollers is passed through perpendicularly to the direction of its movement, and is also flowed through the slab perpendicularly to the direction of its movement. A yoke of an electromagnet generating a direct current magnetic field intersecting a direct current is arranged outside the guide rollers on one wide side of said slab, and at least one of said guide rollers is attached to each of its magnetic poles.
A return iron core portion having magnetic poles formed corresponding to the magnetic poles is disposed on the other wide side of the cast piece, and a return iron core portion having magnetic poles formed to correspond to the magnetic poles is disposed on the other wide side of the cast piece, and a return iron core portion is provided directly to the cast piece for passing a direct current. In a device for stirring molten metal in a connected casting installation, which is provided with contact brushes or contact rollers that are pressed against the outer surface of the piece, two magnet systems are arranged in the yoke of the electromagnet and the excitation coils of these magnet systems have opposite polarity. A molten metal stirring device characterized by generating a magnetic field of 2. The molten metal stirring device according to claim 1, wherein adjacent magnetic poles of the same polarity of the two magnet systems are coupled to one magnetic pole leg. 3. The apparatus according to claim 2, wherein each of the magnetic pole legs and the central leg of the return core section is branched into a plurality of magnetic pole pieces, and the distance between these magnetic pole pieces is at least as large as the guide roller. A stirring device for molten metal, characterized in that it is adapted to the diameter of one piece.