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US 9,174,255 B2Granted
Energy-saving rolling mill train and energy-saving process for operating a combined casting and rolling station
AssigneeSiemens Aktiengesellschaft
InventorsMichael Diez, Norbert Moritz, Günther Winter
Life of this patent
Estimating the term…
Abstract
In a rolling mill train (2; 30; 56) for processing rolling stock (4, 32), at least three rolling stands (10) are directly adjacent in the rolling direction and are driven by electric motors (20) having superconducting windings. It is thereby possible to keep the distances between the rolling stands smaller than with conventional electric drives, thus reducing energy losses during the rolling process. A combined casting and rolling station (40), which is equipped with such an electric motor (20) in the rolling stands, is configured and/or operated efficiently in terms of the required heating power.
Claims24
A rolling mill train for processing rolling stock, comprising
- a plurality of rolling stands immediately adjacent to one another in a rolling direction,
- wherein each rolling stand includes at least a first working roll and a second working roll for processing the rolling stock,
- a plurality of electric motors with superconducting windings arranged to a side next to the rolling stands,
- wherein, for a first one of the rolling stands, a first one of the plurality of superconducting electric motors is connected only to the first working roll of the first rolling stand to drive only the first working roll of the respective rolling stand and a second one of the plurality of superconducting electric motors is connected only to the second working roll of the first rolling stand to drive only the first working roll of the first rolling stand, such that each of the first and second superconducting electric motors is connected to exactly one working roll, the first and second electric motors being arranged on the same lateral side of the first rolling stand, and
- wherein for a second one of the rolling stands, both the first and second working rolls of the second rolling stand are mechanically coupled via a branching transmission that is connected to a shaft of a single one of the electric motors, such that the single electric motor drives both the first and second working rolls of the second rolling stand.
2 more elements
A combined casting and rolling station for continuous production of hot strip, the combined casting and rolling station comprising:
- a caster configured to cast a strip, and
- a rolling mill train arranged downstream from the caster and configured receive the strip from the caster in a continuous cast-and-roll process, the rolling mill train comprising:
- a plurality of rolling stands immediately adjacent to one another in a rolling direction,
- wherein each rolling stand includes at least two working rolls for processing the strip cast by the caster, and
- a plurality of electric motors with superconducting windings arranged to a side next to the rolling stands, and
- wherein for a particular one of the rolling stands, both the first and second working rolls of the second rolling stand are mechanically coupled via a branching transmission that is connected to a shaft of a single one of the electric motors, such that the single electric motor drives both the first and second working rolls of the particular rolling stand.
3 more elements
A method for operating a combined casting and rolling station, the method comprising:
- providing a combined casting and rolling station comprising:
- a caster configured to cast a strip;
- a rolling mill train downstream from the caster and comprising:
- a plurality of rolling stands immediately adjacent to one another in a rolling direction,
- wherein each rolling stand includes at least two working rolls for processing the strip cast by the caster,
- at least one electric motor with superconducting windings arranged to a side next to the rolling stands,
- the at least one electric motor connected to at least one of the working rolls of the rolling mill train;
- and
- a heating device arranged before or after the rolling mill train and configured to heat the strip;
- transmitting the strip with a mass throughput ({dot over (m)}) through the rolling mill train;
- and
- operating the heating device with a heat output in accordance with:
- P<k·{dot over (m)}
- wherein P represents a heating power, and k is a constant with a value between 0.11 (MW·h/t) and 0.14 (MW·h/t).
11 more elements
A combined casting and rolling station for continuous production of hot strip, the combined casting and rolling station comprising:
- a caster configured to cast a strip, and
- a rolling mill train arranged downstream from the caster and configured receive the strip from the caster in a continuous cast-and-roll process, the rolling mill train comprising:
- a plurality of rolling stands adjacent to one another in a rolling direction,
- wherein each rolling stand includes at least two working rolls for processing the strip cast by the caster, and
- a plurality of superconducting electric motors arranged to a side next to the rolling stands,
- wherein a first electric superconducting motor and a second superconducting electric motor are connected to the first and second working rolls, respectively, of a particular rolling stand, and
- wherein the first and second superconducting electric motors, which are connected to the first and second working rolls of the particular rolling stand, partially overlap each other along a direction parallel to the axis of rotation of the first working roll, such that a collective width of the first and second superconducting electric motors along a width direction perpendicular to the axis of rotation of the first working roll is less than a sum of a width of the first superconducting electric motor and a width of the second superconducting electric motor along the width direction.
4 more elements
Dependencies are inferred from the claim text.