MANUFACTURING METHODS AND APPARATUS FOR TARGETED COOLING IN HOT METAL ROLLING

摘要

A rolling mill apparatus and methods of hot rolling with targeted cooling. In one aspect, a mill having multiple roller stacks includes a cooling system that directs the bulk coolant flow to a heat exchanger having first and second heat exchangers in parallel. The first heat exchanger is adapted to cool the heated coolant to a first temperature for use in a first coolant stream discharged through a first set of nozzles during rolling, while the second heat exchanger is adapted to cool heated coolant to a lower temperature for use in a second coolant stream at a second temperature lower than the first for discharge through a second set of nozzles downstream to facilitate rolling or coiling of the rolled metal.

主权项

1. A sheet metal rolling apparatus for rolling a sheet metal, said apparatus comprising:
a first roll stand and a second roll stand positioned in series in a conveyance direction along which the sheet metal is conveyed, wherein each of the first and second roll stands includes a pair of rolls through which the sheet metal is rolled; a first set of cooling nozzles adapted to discharge a cooling fluid to an entry surface of rolls of the first rolling stand, the first set comprising one or more cooling nozzles; a second set of cooling nozzles adapted to discharge the cooling fluid to the exit surfaces of the work rolls of the first roll stand, the second set comprising one or more cooling nozzles; a heat exchanger system that cools the cooling fluid heated by the work rolls after discharge from the first and second set of cooling nozzles sufficiently for subsequent discharge through the first and second set of cooling nozzles, wherein the heat exchanger system comprises:
a first heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a first temperature; anda second heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a second temperature lower than first temperature; and a piping system through which the cooling fluid collected after discharge is transported to the heat exchanger system and the first and second set of cooling nozzles, the piping system being configured such that cooling fluid exiting the first heat exchanger is discharged by the first set of cooling nozzles and cooling fluid exiting the second heat exchanger is discharged by the second set of cooling nozzles.