| 摘要 |
The method involves a moulding stage for forming a partially solidified strand with a molten core, the partially solidified strand passing to a roller stage on leaving the moulding stage, the method comprising, at least during a portion of a casting cycle :- providing a first portion of the rolling stage with a reducing separation between rollers, thereby defining a volume occupied by the strand in that portion; changing the volume of the strand between the rollers in that portion by changing the position of one or more rollers; and providing a further portion of the rolling stage with a reducing separation between rollers. By varying the volume of the strand between the rollers in that portion the volume of the strand can be increased therein, for instance to move the zone of soft reduction away from the moulding stage, or alternatively to lower the level of the meniscus within the solidifying strand. Alternatively, the volume of the strand between the rollers in that portion can be decreased, for instance to move the zone of soft reduction towards the moulding stage, or alternatively to increase the level of the meniscus within the moulding stage. More accurate soft reduction and less wastage material during close down of a casting run result from the application of the invention. <IMAGE> |
