Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1993-06-01
1995-11-21
Rowan, Kurt
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164459, B22D 700, B22D 1104
Patent
active
054678099
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a liquid-cooled plate mold with adjustable width for the continuous casting of billets from steel in the form of slabs, particularly with a slab thickness of less than 100 mm.
BACKGROUND OF THE INVENTION
For the production of steel billets in the form of slabs, it is conventional to employ ingot molds whose free cross-sectional surface at the mold outlet corresponds to the desired billet format.
A corresponding ingot mold for a billet with oval cross section is known from U.S. Pat. No. 2,767,448. This mold is a corresponding ingot mold for a billet with oval cross so-called block ingot mold, i.e. the cross section of the ingot mold cannot be changed and it is not suitable for adjusting different billet formats. Further, an ingot mold is known from the prior art through DE 35 01 422 C2, whose narrow side walls can be adjusted to different billet dimensions and whose pour-in opening has an oval crosssectional surface. The ingot mold tapers toward the outlet end in such a way that the broad sides of the slab form parallel walls, while the narrow side walls diverge from the pour-in side to the pouring side, but retain their concave shape. Such an ingot mold is likewise known from EP 0 249 146 and U.S. Pat. No. 4,716,955.
Ingot molds are known from DE-A1 36 27 991 and WO 87/00099 which have plane surfaces on the narrow sides and convex broad sides along the entire height of the mold.
It must be noted that when using any of these ingot molds deformations occur in the billet shell when the billet passes through the mold, obviously because the billet shells contact the mold wall in different ways, and these deformations can result in cracks in the billet shell.
The object of the present invention is to improve the cooling conditions inside the continuous casting ingot mold and to prevent a blocking of the movement of the billet also in the width direction when the billet passes through the ingot mold so as to eliminate the risk of longitudinal cracks and fissures as far as possible.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a liquid-cooled plate mould with adjustable width for the continuous casting of billets from steel in the form of slabs particularly for a slab thickness of less than 100 mm, the mould having a pour-in side, a slab outlet end and a direction of casting; the mould comprising: oppositely disposed broad side plates forming in the direction of casting curved mould walls; narrow side plates slidably disposed between the broad side plates for increasing the width of the slab along a region of adjustment extending from a smallest slab width to a relatively larger slab width, the narrow side plates being arranged substantially parallel to one another along the height of the mould; the broad side plates including a cavity extending along at least the smallest slab width, the cavity having a curve length, a chord length and a depth, the depth of the cavity of the curved mould being at most 12 mm per 1,000 mm slab width at the pour-inside of the mould; the shape of the broad side plates at the slab outlet end of the mould corresponding to the slab being produced; the broad side plates having a plane inner surface in the region of adjustment of the narrow side plates; and a plurality of ducts within the broad side plates for cooling the mould.
Preferably, the depth or chord continuously decreases from the pour-in side of the mould to the slab outlet end of the motlid and maybe, on the pour-inside, between 5 and 12 mm. The broad side plates are constructed so as to be concave at the slab outlet end of the mould in such a way that the depth of the mould walls forming the curve is still at least 0.5 to 2 mm as seen in cross-section thereof. Preferably, the depth is constant along a first section comprising a third of the mould height. The mould further comprises a second section terminating at approximately half the height of the mould and adjoining the first section of constant depth; the depth of the second sectio
REFERENCES:
patent: 2767448 (1956-10-01), Harter et al.
patent: 4635702 (1987-01-01), Kolakowski
patent: 4716955 (1988-01-01), Fastert
patent: 4926930 (1990-05-01), Gay
patent: 4928747 (1990-05-01), Pleschiutschnigg
patent: 5188167 (1993-02-01), Perry
Arvedi Giovanni
Gosio Giovanni
Ludorff Harald
Manini Luciano
Parschat Lothar
Mannesmann Aktiengesellschaft
Rowan Kurt
LandOfFree
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