Abstract:
To cool a metal strip (1), liquid coolant (5) is supplied to the strip by a supply device (9) from a feed line (10). A valve (13) in the feed line (10) sets the valve (13) to a respective opening position (s) for adjusting the coolant flow (F) to the metal strip (1) per unit of time. An upstream condition detection device (14) upstream of the valve device (13) in the feed line (10) detects an upstream condition (ZV) of the coolant (5). A control unit (6) determines a set point (s*) for an opening position (s) of the valve device (13) corresponding to the set point (F*) for the coolant flow (F) based on a set point (F*) for the coolant flow (F*), the upstream condition (ZV) of the coolant (5) and a valve characteristic (C) of the valve device (13). The valve characteristic (C) follows a characteristic curve (K) of the coolant flow (F) as a function of the opening position (s) of the valve device (13), relative to a reference condition (ZR) of the coolant (5) upstream of the valve device (13) in the feed line (10). The control unit (6) sets the opening position (s) of the valve device (13) according to the set point (s*) that has been determined.
Abstract:
A method and a device for balancing out amount fluctuations while simultaneously increasing the temperature of an export gas (2) used in a reduction process (1). A first partial amount (3) of a recycling gas (4) is cooled in at least one recycling-gas cooler (5) to form a cold recycling gas (6) and the cold recycling gas (6) is fed to the export gas (2) in a pressure-controlled and/or amount-controlled manner in order to balance out amount fluctuations of the export gas (2). A second partial amount of the recycling gas (4) is fed to the export gas (2) as hot recycling gas (7) having a higher temperature than the cold recycling gas (6). Then an export gas mixture (8) of the cold recycling gas (6) and the hot recycling gas (7) is introduced into the reduction process (1), wherein the temperature of the export gas mixture (8) is higher than the temperature of the export gas (2). The temperature of the export gas (2) or of the export gas mixture (8) is set in such a way that temperature is higher than the dew point or dew point temperature of the export gas mixture.
Abstract:
A device (1) for inductive heating of a workpiece (2) in a rolling mill, the device (1) including: a converter (3) for creating an alternating voltage, a capacitor bank (6) electrically connected to the converter (3), and having a plurality of capacitors (7) connected in parallel, a working field (8), in which an upper coil (10) and a lower coil (11) are arranged. The workpiece (2) is able to be passed between the coils (10, 11) and is thereby inductively heated by cross-field heating. A housing (4) arranged next to, below or above the working field (8). The converter (3) and capacitor bank (6) are arranged in the housing (4). The coils (10, 11) are each electrically connected to the capacitor bank (6) by a flexible cable (12, 13). The cable (12, 13) is a coaxial cable (27), with one phase of the alternating voltage applied to an inner conductor (28) and the other phase of the alternating voltage applied to an outer conductor (29) of the coaxial cable (27). The cables (12, 13) are cooled by a fluid, such as air or water (21).
Abstract:
A six-high rolling (also known as sexto) mill stand that is suited for hot rolling an intermediate strip into a thin strip that is less than 0.8 mm thick. A combined casting and rolling installation that includes the six-high rolling mill stand allowing for hot rolling in long uninterrupted sequences, without any change of the work rolls to obtain a strip with good geometry due to moderate rolling forces.
Abstract:
A six-high rolling (also known as sexto) mill stand that is suited for hot rolling an intermediate strip into a thin strip that is less than 0.8 mm thick. A combined casting and rolling installation that includes the six-high rolling mill stand allowing for hot rolling in long uninterrupted sequences, without any change of the work rolls to obtain a strip with good geometry due to moderate rolling forces.
Abstract:
A method for cold rolling rolled stock (2) in a mill train (1) with multiple roll stands (3 to 7). An upper limit temperature and/or a lower limit temperature is provided for a rolled stock temperature of the rolled stock (2) for at least one rolling pass, and the rolled stock temperature is controlled and/or regulated by at least one control or regulating measure such that during the at least one rolling pass, the rolled stock temperature does not exceed the upper limit temperature specified for the rolling pass and/or the rolled stock temperature does not fall below the lower limit temperature specified for the rolling pass.
Abstract:
A method for determining mechanical properties of a first rolled material by a hybrid model that includes production datasets relating to further rolled materials, a physical production model and a statistical data model. The production dataset relating to the first rolled material is used to determine a first mechanical dataset, a further production dataset and a metallurgical dataset and also a second mechanical dataset. An averaged normalized distance value for production datasets relating to the further rolled materials is determined that is used to ascertain the mechanical properties of the rolled material as a weighted average from the first and second mechanical datasets. When creating the hybrid model, the physical production model is used to determine further production datasets relating to the further rolled goods for training the statistical data model.
Abstract:
An optimization method in which a computer ascertains expected values (E1) for actual variables (I1) of a technical process based on values (R) for target variables (Z1) of the technical process that attain the values (R) as far as possible. From data records (D), the computer provisionally selects a number (n1) of records (D) in which the variables (I1) display a minimum distance from the values (E1). The computer then ascertains expected values (E2) for the actual variables (I2) based on the values (R) and the values (E1). From the provisionally selected data records (D), the computer selects a predetermined second number (n2) of data records (D) in which the variables (I1, I2) display a minimum distance from the values (E1, E2). The computer ascertains set values (S) for the variables (Z2) for a yet-to-be-executed cycle to attain variables (Z1) as close to possible to the values (R).
Abstract:
Energy-efficient production of a ferritic hot-rolled strip (6) in an integrated casting-rolling plant (1), which modifies the known processes for producing a ferritic hot-rolled strip (6) in an integrated casting-rolling plant (1) so that the ferritic hot-rolled strip (6) can be produced significantly more energy-efficiently but nevertheless has good metallurgical properties and a good surface quality.
Abstract:
A rolling device (1), a method and a rolling train (35) for the cold rolling of rolled stock (3). The rolling device (1)-a rolling stand (5), multiple assembly sets for optionally assembling the rolling stand (5) with one of the assembly sets, and a working-roll drive. Each assembly set comprises two working rolls (7, 8), and for each working roll (7, 8) two working-roll chocks (9). A spindle head (11), can be connected to a working roll journal (16) of the working roll (7, 8). The working rolls (7, 8) of different assembly sets have different working-roll diameter ranges, which are determined by a respective minimum working-roll diameter and maximum working-roll diameter. The rolling stand (5) has mountings (19) for a respective working-roll chock (9) of an assembly set. The working-roll drive has two drive spindles (27), each for driving a working roll (7, 8) via the spindle head (11) assigned to the working roll (7, 8) by rotations about a longitudinal axis of the drive spindle (27).