Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1996-07-29
1998-03-24
Hai, III, Joseph J.
Metal founding
Process
Shaping liquid metal against a forming surface
164418, 164491, 164436, B22D 1104
Patent
active
057302073
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This application is a 371 of PCT/DE95/00092 filed Jan. 20, 1995.
BACKGROUND OF THE INVENTION
The invention is directed to a continuous casting mold for guiding strands.
DESCRIPTION OF THE PRIOR ART
It is known from DE 39 07 351 A1 to provide continuous casting molds for thin slabs with a funnel-shaped recess in their upper part, that is, in the region of the inlet cross section. This step influences the strand thickness, but has no effect on casting speed.
In the course of development, the following limiting values have taken shape for casting speed with standard strand formats: mm mm 100.times.100 mm.
When these maximum values are exceeded, there is a considerable increase in casting defects in the form of breakout. This is a result of the weaving motion of the strand in the strand guide which occurs at higher speeds. The strand oscillates back and forth in the direction of the narrow sides of the mold. This weaving motion results in nonuniform contact between the strand and the narrow sides of the mold and accordingly leads to asymmetrical heat transfer and to an asymmetrical isotherm profile in the strand shell in the casting direction and vertical thereto.
This disruption of the isotherms leads to stresses and different strand shell thicknesses and accordingly also to distortions of the stand shell which results in an increased breakout rate.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a continuous casting mold in which the weaving of the strand, also known in technical literature as "snaking", is prevented.
Pursuant to this object, and others which will become apparent hereafter, one aspect of the present invention resides in a continuous casting mold for guiding strands, particularly steel strands, which mold is comprised of a pair of cooled first side plates and a pair of second side plates arranged between the first side plates either in a stationary manner or adjustable to the strand width. The first side plates have a cambered shape which extends from a vertical position in an upper 80% of the mold height, and particularly the upper 30%, up to the mold outlet opening. The percentage of mold height being determined from the outlet opening, i.e., the mold inlet opening being at 100% of the mold height.
In another embodiment of the invention the camber of the first side plates is configured to take into account the degree of shrinkage of the cast strand.
In still another embodiment of the invention the first side plates are broad side plates and the second side plates are narrow side plates. The camber being configured to extend in a concave manner from a start of a first one of the narrow side plates to a start of a second one of the narrow side plates.
In still yet another embodiment of the invention the concave shape of the camber extends linearly from a center axis of the mold toward the narrow side plates.
Yet another embodiment of the invention provides that the concave shape extends non-linearly from the center axis toward the narrow side plates.
Still another embodiment of the invention provides the concave shape to be formed from the center axis proceeding with a common turning point from circle radii.
The concave shape, in another embodiment of the invention, extends from the center axis along only part of the length of the broad-side plates corresponding to the minimum cast width of a narrowest cast strand. The broad-side plates run parallel in the region of the minimum width and maximum width of cast strands of different width while the narrow side plates are adjustable to different widths of the cast strand in this region.
Yet another embodiment of the invention provides that the side plates run linearly and at an angle in the regions of minimum width and maximum width to reduce the strand thickness outwardly.
In a further embodiment the concave shape of the broad-side plates in the region of the center axis has a maximum height of 5% of the strand thickness at the transitional region between t
REFERENCES:
patent: 4635702 (1987-01-01), Kolakowski et al.
patent: 4926930 (1990-05-01), Gay et al.
patent: 5188167 (1993-02-01), Perry et al.
patent: 5311922 (1994-05-01), Streubel
Hai, III Joseph J.
Lin I.-H.
Mannesmann Aktiengesellschaft
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