Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1996-01-16
1999-05-11
Batten, Jr., J. Reed
Metal founding
Process
Shaping liquid metal against a forming surface
164476, 164477, 164480, B22D11/06
Patent
active
059017775
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a twin-roll continuous casting method and apparatus for conducting in-line rolling of a thin sheet casting during its transfer, and more particularly to an improved twin-roll continuous casting method which improves the rolling conditions in in-line rolling and a twin-roll continuous casting machine used for this method.
This invention relates to a production method of an ordinary steel sheet corresponding to a hot-rolled steel sheet by using a cast strip produced by the present method as a starting material, and more particularly to a method of reducing variance of materials typified by elongation of the steel material.
BACKGROUND ART
Generally, a twin-roll continuous casting machine is known as an apparatus applying a Bessemer type continuous casting method, and is used for producing a metal thin sheet by pouring a molten metal between a pair of water-cooled casting rolls and solidifying it.
The production of the thin sheet by a twin-roll continuous casting machine 11 of this kind is carried out as shown in FIG. 3. A molten metal L is poured from above and between a pair of casting rolls 12a and 12b disposed with a predetermined gap between them as shown in the drawing, and these casting rolls cooled inside with water 12a, 12b are rotated inwardly downward. Then, the molten metal L are brought into contact with the casting rolls 12a, 12b and is cooled, and is solidified as the solidified shell S in an arcuate form on the surface of each casting roll 12a, 12b. Each solidified shell S is brought close to the other with the revolution of the casting rolls 12a, 12b and is pressed at the minimum portion of the roll gap (hereinafter referred to as the "roll kiss point") into a casting C having a predetermined thickness. The casting C is pulled down from between the casting rolls 12a, 12b.
In this case, it is the point F (hereinafter referred to as the "solidification start point") at which the molten metal L comes into contact with each casting roll 12a, 12b that solidification of the solidified shell S starts. Each solidified shell S which starts solidifying from the solidification start point F of each casting roll 12a, 12b continues to grow till the roll kiss point, and at this roll kiss point, each solidified shell S is rolled into the casting C having a predetermined thickness.
An associated technology for winding the casting C so produced onto a coiler as-cast and shipping the product is described in Japanese Unexamined Patent Publication (Kokai) No. 58-359.
The gist of the invention disclosed in this prior art resides in the following point. In the method, a runner box encompassed by a frame is defined between a pair of water cooling rolls and a tundish, and the upper surface of a molten steel runner box frame is brought into close contact with the bottom surface of said tundish so that an iron hydrostatic pressure of the molten steel level inside said tundish is allowed to act on the solidified shells formed on the pair of said water cooling rolls.
Because this process can obtain a thin cast strip having a casting thickness equivalent to that of a hot-rolled steel sheet obtained through existing rough rolling and finish rolling, at the time of casting, the process can eliminate the hot rolling step according to the prior art and can drastically reduce the cost of production. However, the steel sheet in the form of the cast strip as it is involves the problem that it is inferior in the aspect of the material.
In other words, according to the invention of the prior art, the casting so produced is used, in the as-cast state, as the product. Therefore, the crystal grain size is great, and both elongation and machinability are low. In other words, satisfactory mechanical strength cannot be obtained. Further, because scales of about 100 .mu.m adhere to the surface of the thin sheet casting as-cast, the surface of the casting is rough and coarse.
Therefore, in order to finish the casting C so casted to the product, there are a method which removes the scales of th
REFERENCES:
patent: Re21261 (1939-11-01), Hazelett
patent: 5584337 (1996-12-01), Nakashima et al.
Patent Abstracts of Japan, vol. 012, No. 236 (M-715), Jul. 6, 1988 & JP 63-030158 A (Nippon Kokan KK), Feb. 8, 1988.
Patent Abstracts of Japan, vol. 009, No. 226 (M412), Sep. 12, 1985 & JP 60-083745 A (Mitsubishi Jukogyo KK), May 13, 1985. JP-58 159947 A (Ishikawajima Harima Jukogyo KK), Sep. 22, 1983.
Akamatsu Satoshi
Koyama Kazuo
Matsumura Yoshikazu
Mizoguchi Toshiaki
Morimoto Yoshio
Batten, Jr. J. Reed
Nippon Steel Corporation
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