Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1981-08-13
1984-07-03
Hampilos, Gus T.
Metal founding
Process
Shaping liquid metal against a forming surface
164416, B22D 1104
Patent
active
044573561
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a continuous casting mold which is used for a continuous casting machine.
DESCRIPTION OF THE PRIOR ART
Continuous casting of steel is generally conducted with the use of a continuous casting machine comprising a tundish, a mold, a group of guide rolls, and a group of pinch rolls. Continuous casting machines are broadly classified into the vertical type continuous casting machine and the horizontal type continuous casting machine. In the case of a vertical type continuous casting machine, molten steel received in the tundish is poured through an immersion nozzle provided in the bottom wall of the tundish into the mold. The molten steel cooled in the mold forms a solidified shell. The molten steel having thus formed the solidified shell is withdrawn, while being guided by the group of guide rolls sequentially arranged below the mold, through the group of pinch rolls. In the meantime, the solidified shell, cooled by cooling water sprayed from a plurality of nozzles arranged between said rolls, gradually increases the thickness thereof, and forms a continuously cast strand having a prescribed cross-sectional shape.
In the above-mentioned continuous casting operation, there is a problem of the molten steel seizing to the inner surface of the mold at the time of withdrawing the molten steel having formed the solidified shell from the mold. It is therefore the usual practice to vibrate the mold with a certain amplitude in the withdrawing direction of the cast strand with a view to preventing seizure of molten steel to the inner surface of the mold. This vibration of the mold has usually been effected by a mechanical means. However, in order to vibrate a mold by a mechanical means, it was necessary to provide large-scale facilities with huge quantities of energy. In addition, a mechanical means, with which is difficult to vibrate the mold at a high frequency, causes wavy vibration marks on the cast strand surface under the effect of mold vibration, which may in turn cause surface cracks of the cast strand and was therefore problematic in terms of the quality of cast strand.
Recently, the horizontal type continuous casting machine forming a cast strand by horizontally withdrawing molten steel having formed a solidified shell from a horizontal mold provided at the lower part of a side wall of the tundish has been industrially applied because of the low installation costs and other advantages. In the horizontal type continuous casting machine, the horizontal mold is directly connected to the lower part of a side wall of the tundish. It was therefore impossible to vibrate the horizontal mold alone by a mechanical means.
As a measure to solve the above-mentioned problems, a vibrating apparatus of a continuous casting mold has been disclosed in Japanese Patent Provisional Publication No. 86,432/79 dated July 10, 1979 (hereinafter referred to as the "prior art"), which comprises:
a plurality of ultrasonic vibrators, fitted to the outer surface of each of the side walls of a continuous casting mold, at prescribed intervals in the axial direction of said mold; said mold being vibrated in the axial direction thereof by the vibration of said plurality of ultrasonic vibrators.
The above-mentioned prior art appartus will be discussed with reference to the single FIG. 1 of the present application. In FIG. 1, 1 is a tundish; 2 is a molten steel discharge hole provided in the bottom wall of the tundish 1; 3 is a mold arranged below the molten steel discharge hole 2 of the tundish 1; and 8 is an immersion nozzle attached to the molten steel discharge hole 2, the lower end of the immersion nozzle 8 being located in the mold 3. The mold 3 is supported by a mold frame 6 provided on the outer peripheral surface thereof. Also 7 is a channel for cooling water provided in the interior of the mold 3. The mold 3 is cooled by cooling water flowing through the channel 7.
A plurality of ultrasonic vibrators 4 are fitted to the outer surface of each of the side walls of the mold 3 alo
REFERENCES:
patent: 3075264 (1963-01-01), Wognum
patent: 3153820 (1964-10-01), Criner
patent: 3672436 (1972-06-01), Wognum et al.
Hasebe Nobuhisa
Kawada Hiroshi
Komine Isamu
Batten, Jr. J. Reed
Hampilos Gus T.
Nippon Kokan Kabushiki Kaisha
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