Metal founding – Combined – Including continuous casting apparatus
Patent
1989-02-21
1990-09-11
Seidel, Richard K.
Metal founding
Combined
Including continuous casting apparatus
164418, 164424, 164442, B22D 1104, B22D 1112
Patent
active
049554280
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for the continuous casting of slabs which have a considerable larger width than thickness, particularly of steel slabs with a thickness below 80 mm, whereby molten material is poured from a casting vessel into a mold, having a charge and pour-in cross-section, whose middle portion deviates from the desired casting contour in a cross-section increasing fashion, but corresponding to the desired casting format in the edge zone, and whereby maintaining the cross-sectional format at the charge and pour-in side of the mold is maintained over the entire mold length, and the casting skin as emerging from the mold is to be deformed in the middle portion, by means of guide and support means arranged directly downstream from the mold such that following passage through the deforming path, the surfaces of the entire casting are situated in the surfaces of coinciding with the edge zone.
A mold for continuous casting of this kind is known from British Patent No. A 1,199,805, whereby not only the crosssectional contour, but the cross-section itself, remains uniform from the entrance and charge end to the exit and discharge end of the mold. The final contour of the crosssection of the continuous casting is formed exclusively through rolls which are arranged downstream from the mold.
European Patent No. A 0,149,734, which corresponds to German Patent No. 3,400,220, moreover, makes known a mold for continuous casting of steel strip, wherein the wide sides form an upper funnel shaped pour-in and charge zone.
This mold has the disadvantage that in the transition from a cross-section increasing pour-in zone, to the desired form and format of the continuous casting strong bending forces are exerted upon the skin of the casting within the mold. For reducing the wear resulting from this bending, it is necessary to maintain small the deforming angle alpha, while, in addition, the casting speed and the cooling speed have to be selected within tight limits in order to make sure that the skin can be moved out of the mold without formation of cracks. Molds configured in this fashion exhibit a strong friction in the transition zone which friction can be reduced only to a relatively small extent by means of known lubrication. The known mold, moreover, has the additional disadvantage that upon maintaining a small deforming angle alpha, preferably smaller than 10.degree., the mold has to be made the longer the thinner the slab is supposed to be.
It is an object of the present invention to provide a method and equipment such that steel slabs with a thickness below 80 mm can be manufactured without defects and with a high surface quality.
The object is attained in accordance with the invention by operation of the features which include the following cross-section in the middle portion of the casting is uniformly bulged, but is smaller on the discharge at exit from the mold, as compared with a larger bulge cross-section at the pour-in and charge side, and that lines of transition from the plane slab surface to the bulge surface has a conicity in longitudinal direction matching the cross-sectional and conicity increase of the bulging portion, but to be not more than 1.2%, that the spacing and distance from the outer periphery 18 of a casting pipe and spout, and the apex point of the bulge at the pour-in and charge side in the surface level of the molten material is at least 20 mm; that at least one roll of at least one pair of rolls of the guide and support means downstream from the mold is provided with sizing dimension matching the emerging casting; and that the distance between the rolls of a roller pair from roller pair to roller pair reduces in the direction of casting by at least 0.5 mm, but not more than 25 mm, such that the deformation at the front of solidification does not exceed a value of 0.5%.
The degree of bulging is selected in accordance with the invention such that in dependance upon the outer diameter of the casting spout and pipes, as used in the mold, it has a minimum distance of 3
REFERENCES:
patent: 3974559 (1976-08-01), Kawawa et al.
patent: 4493363 (1985-01-01), Fredriksson et al.
patent: 4635702 (1987-01-01), Kolakowski et al.
patent: 4716955 (1988-01-01), Fastert
Batten, Jr. J. Reed
Mannesmann AG
Seidel Richard K.
Siegemund Ralf H.
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