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(11) | EP 0 998 992 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Roll position control in cluster mills |
| (57) A dynamic position control means for a cluster mill which has a two-part pre-stressed
housing in which the two parts are joined by hydraulic cylinders and associated columns.
It comprises an actuating means located between the housings of the mill, so as to
vary the relative separation or the relative orientation or both of the two halves
of the housing during rolling. The actuating means includes at least one hydraulic
lifting ram disposed substantially between the two halves of the housing, and ideally
four hydraulic lifting rams each ram disposed at the corner position of a rectangular
housing. The hydraulic lifting rams are of the doughnut type, encompassing each of
the hydraulic cylinder's columns. The dynamic position control means includes position
monitoring means, in particular, four position transducers mounted between the four
respective corners of the housings. Control means then adjust the actuating means
in response to the position monitoring means or other measured data. |