Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1998-10-14
2000-11-14
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164268, 164428, 164480, B22D 1106, B22D 1107
Patent
active
061455814
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a twin drum type strip casting apparatus, including a pair of cooling drums and for continuously casting a strip, in which a portion where an end surface of each cooling drum contacts a side dam can be effectively lubricated. Also, the present invention relates to continuous casting method for continuously casting a strip by the above twin drum type continuous strip casting apparatus.
BACKGROUND ART
Recently, a method for directly producing a strip with a thickness which is within several millimeters of the thickness of a final product, from a molten metal such as molten steel, has been studied with keen interest. When the above continuous casting method is adopted, unlike conventional continuous casting methods, it is not necessary to provide a hot rolling process including a large number of processing stages, and further it is sufficient to conduct rolling only lightly on the strip so as to obtain a final produce. Accordingly, it is possible to simplify the process and apparatus on the production line.
One of the continuous casting methods developed to accomplish the above object is a twin drum type continuous casting method disclosed in Japanese Unexamined Patent Publication (Kokai) No. 60-137562.
FIG. 1 is a perspective view to explain an outline of the above twin drum type continuous casting method. In this system, there are horizontally provided a pair of cooling drums 1a, 1b rotated in opposite directions. There is formed a recess portion between the cooling drums 1a, 1b and the side dams 2a, 2b. This recess portion is used as a molten metal pool 3 in which molten metal is accommodated. Molten metal is poured from a container such as a tundish into this molten metal pool 3 via a nozzle, and some of molten metal 4 accommodated in this molten metal pool 3 comes into contact with the cooling drums 1a, 1b and is cooled and solidified, so that a solidified shell can be formed.
This solidified shell is moved in accordance with the rotation of the cooling drums 1a, 1b. At a position where the pair of cooling drums 1a, 1b come most close to each other, that is, at a drum gap portion 6, the solidified shells respectively formed on the surfaces of the cooling drums 1a, 1b are pressed to each other, so that a target strip casting 5 can be obtained. In this case, reference numeral 15 is an end surface of the cooling drum, and reference numeral 16 is a sliding surface.
As disclosed in Japanese Unexamined Utility Model Publication (Kokai) No. 63-90548, each side dam 2a, 2b of this continuous sheet bar casting apparatus includes: a heat insulator accommodated in the side dam case; a base member attached to the heat insulator; and a ceramic plate attached to a portion of the base member corresponding to the cooling drum. Due to the foregoing arrangement, the side dam is pushed against the end surface of the cooling drum at the time of casting, and the ceramic plate is worn away when it comes into contact with the end surface of the cooling drum, so that a gap between the ceramic plate and the end surface of the cooling drum can be eliminated. Therefore, it is possible to prevent a leakage of molten steel. As disclosed in Japanese Unexamined Patent Publication (Kokai) No. 61-266160, in general, the side dam is oscillated, so that the abrasion of the ceramic plate can be accelerated.
In the above continuous strip casting apparatus, an amount of steel to be cast is determined by an abrasion speed of the ceramic plate of the side dam which slides on the end surface of the cooling drum. Therefore, it is very important to suppress the abrasion of the ceramic plate in order to increase an amount of steel to be cast.
The abrasion of the ceramic plate is affected by the factors such as its hardness, surface temperature and surface roughness. In order to suppress the abrasion of the ceramic plate, lubricant is fed onto the abrasion surface of the ceramic plate slidably coming into contact with the end surface of the cooling drum. Due to the foregoing, the abrasion can be r
Egashira Masanobu
Hamai Kazuo
Saito Tatsumi
Sawano Kiyoshi
Takeuchi Tomohide
Lin Kuang Y.
Nippon Steel Corporation
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