The invention relates to a method and to a device for the stretch-bend leveling of a metal strip (B), wherein the metal strip (B) is alternately bent around stretching rollers (1-5) under a tensile stress and the degree of stretching is thus increased, wherein one or more stretching rollers (1-5) are provided with a non-metal coating. The method and the device are characterized in that one or more stretching rollers are provided with a coating (8) of plastic.

The invention relates to a method and to a device for the stretch-bend leveling of a metal strip (B), wherein the metal strip (B) is alternately bent around stretching rollers (1-5) under a tensile stress and the degree of stretching is thus increased, wherein one or more stretching rollers (1-5) are provided with a non-metal coating. The method and the device are characterized in that one or more stretching rollers are provided with a coating (8) of plastic.

A manufacturing assembly for manufacturing a metal part comprises a flattening module having a trolley and at least one pressing roller. The flattening module is movable along a hemming of the metal part. The flattening module comprises at least one pressing actuator that is arranged to move the at least one pressing roller in a determined pressing direction relative to the trolley and to place the pressure roller bearing against the free surface such that the at least one pressing roller exerts pressure on the free surface in said determined pressing direction. The pressure increases auto-adaptively with an altitude of the free surface in a direction opposite the determined pressing direction.

A manufacturing assembly for manufacturing a metal part comprises a flattening module having a trolley and at least one pressing roller. The flattening module is movable along a hemming of the metal part. The flattening module comprises at least one pressing actuator that is arranged to move the at least one pressing roller in a determined pressing direction relative to the trolley and to place the pressure roller bearing against the free surface such that the at least one pressing roller exerts pressure on the free surface in said determined pressing direction. The pressure increases auto-adaptively with an altitude of the free surface in a direction opposite the determined pressing direction.

Dual-stage multi-roll leveler embodiments of the general inventive concept include independent sets of first stage work rolls and second stage work rolls, with each set of work rolls including one or more upper work rolls disposed above one or more lower work rolls. An adjustable but equal entry side-to-exit side gap is present between the upper and lower work rolls of each work roll set. An exemplary dual-stage leveler removes shape defects and coil set and/or curl from a moving strip material through a combination of work roll gap adjustment and first and/or second stage work roll bending. Because there is no feathering out of work roll penetration in either stage, differential roll speed and the problems associated therewith are eliminated.

Dual-stage multi-roll leveler embodiments of the general inventive concept include independent sets of first stage work rolls and second stage work rolls, with each set of work rolls including one or more upper work rolls disposed above one or more lower work rolls. An adjustable but equal entry side-to-exit side gap is present between the upper and lower work rolls of each work roll set. An exemplary dual-stage leveler removes shape defects and coil set and/or curl from a moving strip material through a combination of work roll gap adjustment and first and/or second stage work roll bending. Because there is no feathering out of work roll penetration in either stage, differential roll speed and the problems associated therewith are eliminated.

In a stretching-bending-straightening system and a method for the actuation thereof, material in strip form is fed to a high-tension region (50) and a low-tension region (52), wherein the low-tension region (52) is arranged downstream of the high-tension region (50). A bending-straightening unit is arranged in the high-tension region (50). A measuring system determines first measured values in the high-tension region (50). A controller (C) is intended and suitable for determining a deviation of the first measured values from a setpoint value of the bending-straightening result and for determining at least one manipulated variable for the bending-straightening unit in dependence on the determined deviation within a first closed control loop. By additionally providing at least one measuring system for determining second measured values in the low-tension region, by having a controller (C) intended and suitable for determining a deviation of the second measured values from the setpoint value of the bending-straightening result and for determining the at least one manipulated variable in dependence on the determined deviation within a second closed control loop, and by providing selecting means that are intended and suitable for selecting the first or second closed control loop for reducing the deviation of the first and/or second measured values from the predetermined or predeterminable setpoint value, a stretching-bending-straightening system and a method for the actuation thereof are designed in such a way that the quality of the strips processed thereby is increased.

In a stretching-bending-straightening system and a method for the actuation thereof, material in strip form is fed to a high-tension region (50) and a low-tension region (52), wherein the low-tension region (52) is arranged downstream of the high-tension region (50). A bending-straightening unit is arranged in the high-tension region (50). A measuring system determines first measured values in the high-tension region (50). A controller (C) is intended and suitable for determining a deviation of the first measured values from a setpoint value of the bending-straightening result and for determining at least one manipulated variable for the bending-straightening unit in dependence on the determined deviation within a first closed control loop. By additionally providing at least one measuring system for determining second measured values in the low-tension region, by having a controller (C) intended and suitable for determining a deviation of the second measured values from the setpoint value of the bending-straightening result and for determining the at least one manipulated variable in dependence on the determined deviation within a second closed control loop, and by providing selecting means that are intended and suitable for selecting the first or second closed control loop for reducing the deviation of the first and/or second measured values from the predetermined or predeterminable setpoint value, a stretching-bending-straightening system and a method for the actuation thereof are designed in such a way that the quality of the strips processed thereby is increased.

Dual-stage multi-roll leveler embodiments of the general inventive concept include independent sets of first stage work rolls and second stage work rolls, with each set of work rolls including one or more upper work rolls disposed above one or more lower work rolls. An adjustable but equal entry side-to-exit side gap is present between the upper and lower work rolls of each work roll set. An exemplary dual-stage leveler removes shape defects and coil set and/or curl from a moving strip material through a combination of work roll gap adjustment and first and/or second stage work roll bending. Because there is no feathering out of work roll penetration in either stage, differential roll speed and the problems associated therewith are eliminated.

Dual-stage multi-roll leveler embodiments of the general inventive concept include independent sets of first stage work rolls and second stage work rolls, with each set of work rolls including one or more upper work rolls disposed above one or more lower work rolls. An adjustable but equal entry side-to-exit side gap is present between the upper and lower work rolls of each work roll set. An exemplary dual-stage leveler removes shape defects and coil set and/or curl from a moving strip material through a combination of work roll gap adjustment and first and/or second stage work roll bending. Because there is no feathering out of work roll penetration in either stage, differential roll speed and the problems associated therewith are eliminated.