Twin roller casting

Details Twin roller casting Twin roller casting

1998-01-29

1999-06-29

Lin, Kuang Y.

Metal founding

Means to shape metallic material

Continuous or semicontinuous casting

164480, B22D 1106

Patent

active

059154543

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a twin-roll continuous casting machine in which a pool of molten metal is contained between a pair of spaced apart rotatable rolls and a pair of end dams urged against the ends of the rolls and on rotating the rolls, solidified shells of metal formed on the roll surfaces are continuously passed through the narrowest part of the gap between the rolls and are bonded together to form strip.
Each end dam is subjected to forces tending to push the end dam away from the ends of the rolls and external pressure has to be applied to the end dam to prevent this from occurring. The forces applied to the end dam which tend to push the end dam away from the rolls are due to passes through the narrowest part of the roll gap.
The force (c) is by far the greatest and most variable of the three forces and so the end dam has to be urged against the ends of the rolls with a force which is greater than this force (c) so that leakage does not occur. It will be appreciated that there is wear between the stationary end dam and the ends of the rotating rolls and the greater the contact pressure between the end dam and the rolls, the greater the wear.
Furthermore, the upper part of the end dam which helps to locate the molten pool should not encourage solidification of the molten metal whereas the lower part of the end dam does not necessarily have to promote solidification although it may be beneficial.
An object of the present invention is to provide a twin-roll continuous casting machine having improved end-dams.
It is known from JP-A-60 148646 for a twin roll continuous casting machine to have a pair of end dam structures disposed at and urged into engagement with the axial ends of a pair of rotatable rolls. Each end dam structure comprises three parts arranged in a stack. The uppermost dam part presses against the ends of the rolls with a constant pressure and each of the lower two parts are urged against the ends of the rolls such that if the pressure applied to these parts by the solidified casting exceeds a predetermined value, the parts move away from the ends of the rolls and return into engagement with the ends of the rolls when the pressure is reduced below the predetermined value.
According to the present invention a twin-roll continuous casting machine comprises a pair of rotatable rolls arranged in side-by-side parallel relation with a gap therebetween and a pair of end dam structures disposed at and urged into engagement with the axial ends of the roll barrels so that in use, a pool of molten metal is contained between the rolls and the end dam structures and solidified shells of metal pass continuously through the narrowest part of the gap between the rolls and are bonded together to form strip; characterised in that each end dam structure comprises a first part located adjacent the narrowest part of the gap and a second part above the first part, said first part being mounted on a support arm which has means for urging the support arm towards the ends of the roll barrels to force the first part into engagement with the ends of the roll barrels and pressure exerting means mounted on the support arm which serve to urge the second part into engagement with the ends of the roll barrels, said first part being urged into engagement with the rolls with a contact pressure which may be different than that between the second part and the rolls.
The part of each end dam which abuts the rolls adjacent the narrowest part of the gap is subjected to force (c) referred to above and the pressure applied by the support arm to this part of the end dam is sufficiently large to maintain sealing with the ends of the rolls.
The other part of the end-dam is usually subjected to a lower contact pressure with the ends of the rolls because the pressure exerted by the molten metal on this part of the end dam is lower.
By splitting the loadings on the end dam, if the load on the lower part is exceeded, the seal between the upper part of the end dam is likely to be maintained due to the independent loading. The possi

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