Metal founding – Including means to directly apply magnetic force to work or... – By electromagnetic means
Patent
1991-10-22
1993-08-24
Lin, Kuang Y.
Metal founding
Including means to directly apply magnetic force to work or...
By electromagnetic means
164466, B22D 2702, B22D 1110
Patent
active
052380513
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
This invention relates to a continuous casting apparatus, and more particularly to an electromagnetic brake device for a continuous casting mold which applies braking to a flow of molten steel from an immersion nozzle in the continuous casting of steel, thereby reducing inclusions contained in the molten steel.
Japanese Patent Unexamined Publication No. 63-203256 discloses a technique directed to an apparatus for decelerating a flow of molten steel from an immersion nozzle in a casting mold to reduce inclusions contained in the molten steel.
As shown in FIGS. 1 and 2, in this technique, two pairs of magnetic poles 12 of an electromagnetic brake are disposed locally laterally of a molten steel discharge flow path of an immersion nozzle 29. Electromagnets 11 used here have a laterally-elongated horse shoe-shape in a horizontal cross-section, and coils 28 are wound respectively on the opposite ends of each electromagnet, and these portions serve as the magnetic poles 12.
As shown in FIG. 3, the magnetic poles 12 are inserted respectively into openings 33 provided in long-side water boxes 2 of the mold, and are extended through long-side backup plates (not shown), and the end faces of the magnetic poles are secured to long-side copper plates 3 by bolts, thereby mounting yoke portions 13 of the electromagnets 11 on the long-side water boxes 2. The long-side water box 2 is mounted on a mold support frame 35 through support shafts 34 mounted on the opposite ends of this box. The mold support frame 35 is mounted on vibration tables 8. The long-side backup plate, covering a region 0.5 to 2 times larger in size than each side of the magnetic pole with reference to the center of the magnetic pole, is made of a magnetic material.
In FIGS. 1, 2 and 3, 4 denotes a short-side backup plate, 5 denotes a short-side copper plate, 26 denotes a cast piece, 29a denotes a molten steel outlet, 30 denotes the molten steel, and 40 denotes lines of magnetic force.
In the technique disclosed in the above Japanese Patent Unexamined Publication No. 63-203256, since the magnetic poles 12 are disposed locally along the molten steel discharge flow path of the immersion nozzle 29 as shown in FIG. 4A, the discharge flow, after passing past the magnetic field, hardly becomes a uniform flow, as shown in FIG. 4B, and the inclusions in the molten steel flow are involved internally to intrude deep into the molten steel, so that the effect of reducing the inclusions can not be sufficiently expected.
The electromagnetic brake device has a considerable weight, and in the type of construction fixedly mounted in the casting mold, this device vibrates together with the casting mold during the operation, and therefore it is necessary to firmly fix the device to the casting mold. As a result, particularly when grounding the device to an already-installed continuous casting apparatus, there are needed considerably extensive modifications of the equipment, such as an increased outer size due to a rigid construction of the casting mold, an increased motor capacity due to an increased load on the mold vibrating device, and an increased strength of a drive system necessitated by it. Therefore, much cost is required for the modifications, and there are encountered many drawbacks such as an installation difficulty.
Japanese Patent Publication No. 49-30613 discloses a technique in which magnetic poles of an electromagnet are disposed outside a casting mold, and windings are wound on them, and the magnetic poles are connected together by yokes to provide an integral construction. Lines of magnetic force pass through molten steel poured into the casting mold. However, in the technique disclosed in the above Japanese Patent Publication No. 49-30613, the width of the magnetic pole is small relative to the width of the casting mold, and as a result a sufficient magnetic flux density is not produced at the widthwise ends of the casting mold, and inclusions are inevitably involved internally to intruded own ward, so that the effect of reducing the incl
Funatsu Katsumi
Ishikawa Yoshiyasu
Ishizawa Takashi
Kageyama Ryuichi
Kanki Toyohiko
Lin Kuang Y.
Nippon Steel Corp.
Nittetsu Plant Designing Corp.
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