Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1990-04-09
1991-10-29
Lin, Kuang Y.
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164480, B22D 1106
Patent
active
050607146
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a twin roll continuous casting apparatus for continuously casting a metal strip directly from a molten metal such as a molten steel.
BACKGROUND OF THE INVENTION
Well known in the art is a so-called twin roll continuous casting apparatus in which a pair of internally cooled rolls having respectively horizontal axes and rotating in opposite direction to each other are disposed parallel to each other with an appropriate gap therebetween, a pool of molten metal is formed on the circumferential surfaces (the upper halves of cylindrical surfaces in the axial directions) of the rolls above the gap and the molten metal is continuously cast into a metal strip through the gap while being cooled by the circumferential surfaces of the rotating rolls. There has also been proposed such a twin roll continuous apparatus applied to a case of continuous casting of steel to produce a steel strip directly from molten steel.
When a metal strip is continuously cast through a gap between a pair of rolls, it is necessary to form a pool of molten metal on the circumferential surfaces of the pair of rolls above the gap therebetween and to maintain a level of the molten metal in the pool substantially constant by continuously pouring the molten metal into the pool. In order to form the pool of molten metal, there are required a pair of dams having their surfaces perpendicular to the roll axes which prevent an overflow of molten metal along the roll axes on the circumferential surfaces of the rolls. These dams also serve usually to regulate the width of the cast strip and are referred to herein as "side dams". In addition to the side dams disposed at the left and right sides of the rolls, a pair of front and rear dams (referred to herein as "longitudinal dams") having their surfaces along the roll axes may be erected orthogonally to the side dams on the circumferential surfaces of the rolls so as to form a box-like pool for molten metal with the side dams and the longitudinal dams. However, when the pair of rolls have sufficiently large radii respectively, the front and rear gates along the roll axes are not always needed. In this case, the circumferential surfaces of the pair of rolls may fulfill by themselves roles of the front and rear gates.
There are known, as the pair of side dams, movable side dams which urge a pair of endless metal belts, caterpillars and the like against both edge surfaces of the rolls (side surfaces of the rolls perpendicular to the roll axes) at a location of the roll gap and move at a speed corresponding to the casting speed, and fixed side dams which have plate-like bodies of refractories fixed to left and right side surfaces of the rolls. Generally, with the latter fixed side dams, the constitution of the apparatus is simple and the control of running is not complicated, compared with the former movable side dams. Also known in the art is a system of combined side dams in which fixed side dams are combined with movable side dams. See JP A-62-214,835 which corresponds to U.S. Pat. No. 4,754,802.
Two systems of the fixed side dams are known. One is a system in which the distance between the plate-like bodies of the fixed side dams is smaller than the roll width (the length of roll from one end to the other end), and the other is a system in which the distance is the same as the roll width. According to the former system, the pair of side dams are erected on the circumferential surfaces of the rolls such that the bottoms of the side dams slidably contact the circumferential surfaces of the rolls. According to the latter system, the side dams are fixedly provided so that the respective inside surfaces of the side dams slidably contact the side surfaces of the rolls, that is, the pair of side dams sandwich the pair of rolls on the side surfaces of the rolls.
Usually, the fixed side dams are made of refractory material having a good adiabatic property. This is because the molten metal contacting the side dams has to be pre
REFERENCES:
patent: 4811780 (1989-03-01), Yamauchi et al.
Hasegawa Morihiro
Yamauchi Takashi
Lin Kuang Y.
Nisshin Steel Co. Ltd.
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