Metal treatment – Compositions – Heat treating
Patent
1975-02-20
1977-01-04
Lake, Roy
Metal treatment
Compositions
Heat treating
266 50, 164263, B23K 3110
Patent
active
040010511
ABSTRACT:
Methods and apparatus are provided for protecting the supporting rolls of continuously moving freshly cast heavy metal strands (e.g., continuously cast billets and slabs), so that the rolls are not damaged by cutting torches while the strands being supported are being worked upon by those torches. This is achieved by sequentially pivoting individual ones of the supporting rolls out of the support path only momentarily as the cutting torch passes in the vicinity thereof, while continuously rotating the retracted support roll, and returning the roll to normal position after the torch has passed. Pivoting movement of a support roll, either in the retracting or return direction is caused to take place during the moments of highest exposure of the roll to flying slag from the torch in order to minimize the time of such exposure. This pivoting sequence of individual rolls takes place while still maintaining proper support of the strand by means of adjacent, operative support rolls. Adequate protection of the rolls is afforded even though the rolls are pivoted in a path somewhat parallel to the support path of the strand and are not retracted far from such path. The new arrangement simplifies the protective covering requirements of the support rolls and enables an inexpensive, rugged pivoting mechanism to be utilized for moving the support rolls. The pivoting devices may be reversible hydraulic cylinders connected to a common pump through an appropriate valving arrangement and may provide for equal or different pivoting speeds in the movement of the various support rolls away from and back to their working positions.
REFERENCES:
patent: 3511489 (1970-05-01), Field
patent: 3788620 (1974-01-01), Lotz
Bell Paul A.
DEMAG Aktiengesellschaft
Lake Roy
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