Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1996-07-29
1998-11-24
Hail, III, Joseph J.
Metal founding
Process
Shaping liquid metal against a forming surface
164418, 164436, 164442, 164459, B22D 11128, B22D 1114, B22D 1104
Patent
active
058395032
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This application is a 371 of PCT/DE95/00094 filed Jan. 20 1995.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a continuous casting installation for guiding strands.
2. Description of the Prior Art
It is known from DE 39 07 351 A 1 to provide continuous casting installations 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 270 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 strand 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 installation 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 installation for guiding a cast strand, which casting installation includes a continuous casting mold having a height and an outlet opening, and a strand guide stand arranged downstream of the casting mold. The continuous casting mold includes a pair of cooled first side plates and a pair of second side plates which are arranged between the first side plates in a stationary or adjustable manner. The first side plates are cambered (i.e. concave). The camber extends from a vertical portion in an upper 80% of the mold height, preferably in the upper 30%, up to and including 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. The strand guide stand has support roll pairs which are arranged downstream of the continuous casting mold and are configured so that the camber of the mold continues into some of the support roll pairs.
In another embodiment of the invention the degree of shrinkage of the cast strand is taken into account in configuring the camber of the continuous casting mold and the support roll pairs.
In yet another embodiment of the invention the camber of the support roll pairs extends beyond the crater end of the strand.
Yet another embodiment of the invention provides that the camber extends as a concave shape from the start of one narrow side plate to the start of the other, opposite narrow side plate.
In still a further embodiment of the invention the concave shape extends linearly from a center axis in the direction of the narrow side plates.
In a further embodiment of the invention the concave shape extends non-linearly from the center axis toward the narrow side plates.
Still a further embodiment of the invention provides that the concave shape is formed from the center axis of the mold preceding from circle radii with a common turning point.
Still an additional embodiment of the invention provides that the concave shape extends from the center axis of the mold along only a part of the length of the broad-side plates of the mold which length corresponds to the minimum cast width of a narrowest cast strand. The broad-side plates run parallel in the region of the minimum width and the maximum widt
REFERENCES:
patent: 4926930 (1990-05-01), Gay et al.
patent: 4955428 (1990-09-01), Schrewe
patent: 5188167 (1993-02-01), Perry et al.
patent: 5460220 (1995-10-01), Coassin
Hail III Joseph J.
Lin I.-H.
Mannesmann Aktiengesellschaft
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