This circular rolling mill has a fixed main frame, a pair of cylindrical rollers, internal and external, to shape internal and external radial faces of an annular part and supported by a first secondary frame mounted on the main frame, as well as a pair of conical rollers, upper and lower, to shape opposite front faces of the part and supported by a second secondary frame mounted on the main frame. At least one rack and pinion assembly moves a roller in translation relative to one of the secondary frames. At least one electric geared motor drives the pinion of the rack and pinion assembly. The electric geared motor is fixedly mounted relative to one of the auxiliary frames. A fluid discharge mechanism is interposed in a kinematic chain for transmitting force between the rack and the roller moved by this rack. The fluid discharge mechanism has at least one variable volume chamber supplied with pressurized fluid and the volume of which varies as a function of the relative position of the roller and of the rack.

A rolling mill for producing rolling mill product is provided. The rolling mill includes a rolling mill line that moves the rolling mill product. A plurality of rolling mill stands are coupled to the rolling mill line that receives the rolling mill product and rolls the rolling mill product. A plurality of speed measuring devices that are positioned in close proximity to each rolling mill stand, where each speed measuring device measures the speed of the rolling mill product as it passes the speed measuring devices. A control device receives information associated with the speed measuring devices and adjusts the speed of the rolling mill product for any speed differential that might exist between any of the rolling mill stands.

A metal band (1) is first rolled in a front (upstream) and then in a rear (downstream) roll stand (2a, 2b) of a multi-stand rolling train. A looper (3) applied on the metal band (1) between the roll stands (2a, 2b) detects a band tension (Z) present in the metal band (1). The band tension (Z) is supplied to a first and a second tension controller (8, 9), which determine an application additional target value (s*, F*) and a speed additional target value (v*). The second tension controller (9) only determines a value less than or greater than 0, as the speed additional target value (v*), if the band tension (Z) is above or below an upper or lower band tension limit (Z1, Z2). Otherwise, same returns the speed additional target value (v*) to the value 0. The first tension controller (8) is also supplied with a target tension (Z*) that falls between the band tension limits (Z1, Z2). The first tension controller (8) determines the application additional target value (s*, F*) using a determining standard based on the deviation of the band tension (Z) from the target tension (Z*). The determining standard also permits a value different to 0 as the application additional target value (s*, F*) if the band tension (Z) falls between the band tension limits (Z1, Z2). The application additional target value (s*, F*) acts on the rear roll stand (2b). The speed additional target value (v*) acts on the front roll stand (2a) with a positive indicator, or on the rear roll stand (2b) with a negative indicator.

A metal band (1) is first rolled in a front (upstream) and then in a rear (downstream) roll stand (2a, 2b) of a multi-stand rolling train. A looper (3) applied on the metal band (1) between the roll stands (2a, 2b) detects a band tension (Z) present in the metal band (1). The band tension (Z) is supplied to a first and a second tension controller (8, 9), which determine an application additional target value (s*, F*) and a speed additional target value (v*). The second tension controller (9) only determines a value less than or greater than 0, as the speed additional target value (v*), if the band tension (Z) is above or below an upper or lower band tension limit (Z1, Z2). Otherwise, same returns the speed additional target value (v*) to the value 0. The first tension controller (8) is also supplied with a target tension (Z*) that falls between the band tension limits (Z1, Z2). The first tension controller (8) determines the application additional target value (s*, F*) using a determining standard based on the deviation of the band tension (Z) from the target tension (Z*). The determining standard also permits a value different to 0 as the application additional target value (s*, F*) if the band tension (Z) falls between the band tension limits (Z1, Z2). The application additional target value (s*, F*) acts on the rear roll stand (2b). The speed additional target value (v*) acts on the front roll stand (2a) with a positive indicator, or on the rear roll stand (2b) with a negative indicator.

Rolling station intended to couple with a respective rolling cartridge or stand provided with two rolling cylinders, wherein the rolling station has a supporting frame of the transmissions suitable for housing a pair of transmission devices of which a first transmission device is intended to couple with a first rolling cylinder and a second transmission device is intended to couple with a second rolling cylinder, the first rolling cylinder being put in rotation by a first motor via the first transmission device and the second rolling cylinder being put in rotation by a second motor via the second transmission device.

Rolling station intended to couple with a respective rolling cartridge or stand provided with two rolling cylinders, wherein the rolling station has a supporting frame of the transmissions suitable for housing a pair of transmission devices of which a first transmission device is intended to couple with a first rolling cylinder and a second transmission device is intended to couple with a second rolling cylinder, the first rolling cylinder being put in rotation by a first motor via the first transmission device and the second rolling cylinder being put in rotation by a second motor via the second transmission device.

A method for reducing the strip tension of a rolling stock, may include: transporting the rolling stock using a roller table between two successive rolling units, wherein a rolling stock loop is formed in a depression in a section of the roller table between the two rolling units, the rolling stock loop being supported by the roller table at least in one off-center portion of the section, wherein the supporting line of the roller table in this portion corresponds to the catenary curve of the free span; measuring a loop depth of the rolling stock loop; calculating a desired value of the loop depth that corresponds substantially to the free span, e.g., depending on the material, thickness and temperature of the rolling stock; controlling the main drives and/or the gap adjustment of the rolling units based on the desired value and the measured loop depth, such that the loop depth substantially corresponds to the desired value.

A method for reducing the strip tension of a rolling stock, may include: transporting the rolling stock using a roller table between two successive rolling units, wherein a rolling stock loop is formed in a depression in a section of the roller table between the two rolling units, the rolling stock loop being supported by the roller table at least in one off-center portion of the section, wherein the supporting line of the roller table in this portion corresponds to the catenary curve of the free span; measuring a loop depth of the rolling stock loop; calculating a desired value of the loop depth that corresponds substantially to the free span, e.g., depending on the material, thickness and temperature of the rolling stock; controlling the main drives and/or the gap adjustment of the rolling units based on the desired value and the measured loop depth, such that the loop depth substantially corresponds to the desired value.

A method is disclosed for actuating a tandem roll train, in particular a cold-strip tandem roll train, for producing a strip, e.g., a metal strip, wherein a plurality of drives are provided in a production direction of the strip, the speeds of which drives are adapted via cascade control by way of a master drive, wherein a property of the strip is determined and the direction of action of the cascade control is changed depending on said property, by a control factor (K) being provided, by way of which the direction of action of the cascade control is changed, wherein 0K1, and wherein if 0<K<1 the action direction is split proportionally between upstream cascading and downstream cascading.

A method is disclosed for actuating a tandem roll train, in particular a cold-strip tandem roll train, for producing a strip, e.g., a metal strip, wherein a plurality of drives are provided in a production direction of the strip, the speeds of which drives are adapted via cascade control by way of a master drive, wherein a property of the strip is determined and the direction of action of the cascade control is changed depending on said property, by a control factor (K) being provided, by way of which the direction of action of the cascade control is changed, wherein 0K1, and wherein if 0<K<1 the action direction is split proportionally between upstream cascading and downstream cascading.