Method for controlling and/or regulating the cooling stretch of a hot strip rolling mill for rolling metal strip, and corresponding device
AssigneeSiemens Aktiengesellschaft
InventorsOtto Gramckow, Rolf-Martin Rein, Klaus Weinzierl
Life of this patent
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Abstract
A method and device for the automation of a cooling section in a hot strip rolling mill, wherein an individual course of cooling over time for each strip point of the metal strip is specified and whereby the cooling specifications can be determined from the desired properties of the steel, independent of variable process value.
Claims15
A method for an open-loop and/or closed-loop control of a cooling section of a hot strip rolling mill for rolling metal strip, wherein microstructural properties of the rolled metal strip are adjusted by cooling, comprising specifying for each strip point of the metal strip, an individual course of cooling over time, said course of cooling of different strip points having different coiling temperatures;
- determining for each strip point of the metal strip, an actual cooling curve as a function of time;
- comparing the determined time function of the actual course of cooling with a specification of the course of cooling over time for each strip point of the metal strip;
- and deriving process control signals for the control of the cooling section from any deviations of the determined time curves from the actual course of cooling.
A device for controlling a cooling section of a hot strip rolling mill for rolling metal strip comprising a cooling section, in which a metal strip running there through is contacted with a coolant dispensed from adjustable valves, means for determining temperature-time functions of each individual strip point of the metal strip a process control unit for obtaining process control signals for open-loop and/or closed-loop control of the cooling section in accordance with specified criteria, further comprising means for specifying for each strip point of the metal strip an individual course of cooling over time.
Dependencies are inferred from the claim text.