DE102018203746A1 - Roller leveler and method of operating such - Google Patents

Abstract

The invention relates to a roller leveling machine (1) comprising a set of upper and lower straightening rollers (2), each straightening roller (2) being provided with a rotary drive (3) for causing the straightening roller (2) to be actuated by a machine control (4) rotate and so to promote a metallic flat material to be conveyed in a conveying direction (F) and to direct it. In order to achieve an improved and optimized straightening result, the invention provides that each straightening roller (2) has a first rotary drive (L, L, ..., L) which can rotate the one axial end of the straightening roller (2), and a second rotary drive (R, R, ..., R) capable of rotating the other axial end of the straightening roller (2), the machine controller (4) being configured to rotate the respective first and second rotary drives (L, L,. .., L, R, R, ..., R) after setting a value individually with a rotational movement of the straightening roller (2) determining parameters to apply. Furthermore, the invention relates to a method for operating such a roller leveler.

Description

The invention relates to a roller leveler with a set of upper and lower straightening rollers, each straightening roller is provided with a rotary drive to, caused by a machine control, to rotate the straightening roller and so to promote a metallic flat material to be straightened in a conveying direction and thereby. Furthermore, the invention relates to a method for operating such a roller leveler.

When straightening high-strength strips and sheets, a high moment is introduced into the straightening rolls in order to set the necessary overextension for the production of planar materials. The permissible moment is limited by the geometry of the leveling pin.

Are known on both sides driven straightening machines, which generally have a group drive. Also known are single drives of straightening rollers with which the straightening rollers are driven only on one side.

The DE 1 930 349 A discloses both a two-sided drive the straightening rollers, as well as their individual drive. In this solution, however, it is provided to use the two-sided drive exclusively for reasons of space, to provide sufficient space for the arrangement of individual drives.

By arranging the drive on both sides of a straightening roller, each drive can work with half the power and thus be accommodated in a reduced space.

The KR 10 1508711 B1 provides a pair of drift rollers in front of or behind the straightening roller unit to apply an additional strip tension to the material. This should limit the required torques.

When straightening high-strength strips and sheets, special demands are placed on the entire straightening machine in order to set the best possible flatness of the material. It is necessary for the straightening process to initiate very high moments in the leveling rolls. At the same time, however, the straightening rollers must be able to realize complex flatness errors via individual control of machine functions.

When unilaterally driven straightening rollers can occur at high torque input to unimpressable twists between the straightening roller and the material to be straightened, resulting in uneven straightening, which is associated with quality losses in the straightening result. In addition, the amount of permissible torque is limited by the dimensioning of the leveling journal.

In the case of double-sided straightening rollers with group drive, the torque can only be adjusted jointly for all straightening rollers. Accordingly, the adjustment of the torque or the speed for setting a straightening gap can be done disadvantageously only for all straightening rollers together. In addition, the necessary transfer cases have additional loss and distribution deficits.

The arrangement of additional driver rollers for applying a forward or retraction has a negative effect on the straightening roller geometry, because in this way the straightening rollers are deflected in the pulling direction. Thus, the straightening gap is geometrically deformed and the straightening result is degraded.

The invention is therefore based on the object, a roller leveler of the type mentioned above and a method for operating such a way that in comparison with the above-known prior art solution, an improved and optimized directional result can be achieved.

The solution of this object by the invention is characterized in that each straightening roller has a first rotary drive which can rotate the one axial end of the straightening roller, and a second rotary drive which can rotate the other axial end of the straightening roller, wherein the machine control is formed in that the respective first and second rotary drives are individually subjected to a parameter determining the rotary movement of the straightening roller after the specification of a value.

The machine control can be in connection with a setpoint default, which specifies the parameters for the rotational movement of the straightening rollers for all rotary actuators.

The machine control is preferably designed to apply a predetermined torque to the respective first and second rotary drives. Similarly, the machine controller may be configured to apply a predetermined rotational speed to the respective first and second rotary actuators.

The machine control can also be designed to control the parameters determining the rotational movement of the straightening roller in a closed loop. In this case, it is preferably provided that arranged in the region of the first and second rotary actuators sensors for detecting the torque and / or the rotational speed are in communication with the machine control.

The method for operating such a roller straightening machine according to the invention provides that each straightening roller has a first rotary drive, which rotates the one axial end of the straightening roller, and a second rotary drive which rotates the other axial end of the straightening roller, wherein the machine control for the respective individual values for at least one parameter determining the rotational movement of the straightening roller are specified for the first and second rotary drives.

1. a) Betreiben nur der ersten Drehantriebe der Richtwalzen;
2. b) Betreiben nur der zweiten Drehantriebe der Richtwalzen;
3. c) Betreiben sowohl der ersten Drehantriebe als auch der zweiten Drehantriebe der Richtwalzen.

It is preferably provided that the machine control is optionally operated in one of the following operating modes:

1. a) operate only the first rotary drives of straightening rollers;
2. b) operating only the second rotary drives of straightening rollers;
3. c) operating both the first rotary actuators and the second rotary drives of the straightening rollers.

The machine control can be specified by a setpoint default setpoints for the parameters for the rotational movement of the straightening rollers.

The setpoint adjuster can be in communication with a module in which a number of different straightening strategies are stored, wherein for each straightening strategy a data set for the parameters for the rotational movement of the straightening rollers is present, wherein the module sets the setpoint default the record according to a selected straightening strategy.

Thus, the invention provides that each individual straightening roller can be driven either on one side or on both sides. Each straightening roller drive can have its own drive control.

Based on the above-described prior art solution is accordingly a roller leveling machine and a method for their operation is provided which allows optimal control of the individual, two-sided drives of each straightening roller and thus allows an individually influenced straightening process.

It can be a setpoint specification of the drive parameters (torque, speed or rotational speed) according to the specification of a drive unit. In this case, the drive unit can be controlled or regulated by a directional strategy. The straightening strategy can take into account local changes in the straightening gap. It is a precise adjustment of the drive parameters of each driven straightening roller (in terms of speed and / or torque) possible, in particular a one-sided or a double-sided drive.

It can thus also be a targeted distribution of the drive parameters on the sides and / or the selection of straightening rollers. It is also possible synchronization of the drive parameters and, if necessary, a targeted trim the drive parameters.

The proposed solution can also be a load balancing control for targeted torque distribution, whereby an optimized utilization of the component life of the components in the drive train is possible. Such a load balancing scheme can be based on the indicative strategy.

Furthermore, it is very advantageous that in the reversing operation of the straightening machine completely symmetrical conditions for the preceding straightening stitch can be set.

In the proposed method, a control of the (active) straightening roller drives can be carried out after specification of desired values, which are predetermined by the straightening strategy of the drive unit. Subsequently, the straightening process is carried out with the provided or predetermined drive values for the individual straightening rollers. If necessary, (in the closed loop), a correction of the control of the active straightening roller drives take place, d. H. Based on a target-actual-value comparison of the drive values during a roughing pass.

In this case, a separate or a common control or control of the drives can take place. As mentioned, a synchronized operation of the drives is possible.

The straightening strategy can take into account error types of the material to be straightened. Likewise, wear and tear on the equipment (ie, tool wear) can be taken into account.

The drive for the straightening rollers can be an assembly unit, which consists of an (electric or hydraulic) drive motor and possibly an associated transmission gear (including spindle, shafts and couplings, etc.).

In most cases, all straightening rollers are actively driven. However, it is also possible that partially straightening rollers are not driven. Accordingly, according to the specification of a straightening strategy used for the purpose Straightening roller drives are actively switched, provided that they are actively involved in the forming process of the material and should transmit torque. However, individual drives can run loosely (not driven) without transmitting torque into the roller; such rollers can also be switched off completely, their drives are then passive.

The proposed roller leveler or the described method is preferably used in high-strength materials in which a very high torque of straightening rollers is required for the straightening process. They are particularly suitable for straightening high-strength steel sheets or strips.

Advantageously, therefore, results from the proposal according to the invention that can be responded individually and promptly due to the separate two-sided presetting and control of torque and / or speed of the straightening rolls on locally acting faults and flatness errors, namely at the introduction of very high torques.

Thus, the straightening range of a straightening machine can be extended, so that the product range, which can be processed in a given system configuration, is extended. Thus, in the given case eliminates the need to invest in another leveler, because a higher coverage of the product range can be achieved. Alternatively, the size of a leveler can be reduced with existing task.

It can also be a targeted change in the straightening effect by unilateral or two-sided change in torque on one or more straightening rollers set so that the known employment of straightening rollers (employment, bending, pivoting) another effective actuator for improving the flatness is provided.

When reversing the straightening machine fully symmetric conditions can be made to the previous straight stitch.

In the drawing, an embodiment of the invention is shown. The single figure shows in plan view schematically a roller leveler for straightening a metallic band.

The figure shows a schematic representation of the plan view of a roller leveler 1 with a number of straightening rollers 2 of which only one sentence is shown. For straightening a metallic strip, not shown, is an upper and a lower set of straightening rolls 2 intended. During the straightening process, the belt is in a conveying direction F promoted.

Every straightening roller 2 has a rotary drive 3 , Which consists in the present case of a first rotary drive and a second rotary drive, each in the two axial ends of the straightening rollers 2 are arranged. Every straightening roller 2 So has a drive on both sides, each by a machine control 4 is controllable. This is exemplary for the left side of the Rollenrichtmaschine 1 shown, with the first rotary actuators L ₁ . L ₂ . .. , to L _{n are} designated. Corresponding are second rotary actuators R ₁ . R ₂ . .. , to R _{n provided} on the right side.

Through the respective first and second rotary drives, the straightening rollers 2 get their operating parameters through the machine control 4 specified. This single control applies to both axial ends of the straightening rollers, so for both rotary actuators. The right-sided and left-sided control of all straightening rollers 2 takes place independently of each other.

It applies to each of the first and second rotary actuators that are given for this by the machine control the relevant parameters for the rotary drive, ie in particular the torque Md , with the rotary drive the straightening rollers 2 drives, as well as their speed (or rotational speed). The specified values for the torque or the rotational speed are maintained by the machine control 4 in a closed loop, including sensors 6 are present (of which only one is shown in the figure), which detect the actual values (for the torque or the speed) and to the machine control 4 pass, so that in case of deviations from target values, a readjustment can take place.

The control of the machine is beyond the control of all drives 4 Continue adjusting parameters to the leveler to set the leveling gap and to maintain it in a regulated manner at specified values. This is done via the employment of the immersion depth, the bending, the pivoting, the compensation systems, etc. However, this is the previously known operation of a Rollenrichtmaschine, so that said control is shown only schematically in the figure as a dashed arrow.

It should be noted in this context on the mutual influence of Richtspaltdimensionen, material parameters, Anstellparametern and drive parameters, so that any change is not considered in isolation, but is taken into account as part of the overall control concept.

The machine control 4 stands with a setpoint generator 5 in conjunction, in which the concrete data for torques and speeds are available. The machine control 4 thus sets the of Sollwertvorgeber 5 Data received as a setpoint specification are converted into control values for machine functions. The setpoint specification contains all the necessary parameters, including the drive parameters for setting each straightening roller of the straightening machine and the straightening gap for the respective topping.

The exact adjustment of the drive parameters (torque, speed) of each straightening roller 2 can be extended by the choice between a one-sided or a two-sided (double-sided) drive, which is specified depending on the desired straightening strategy. There is a module for this 7 for storing and / or calculating straightening strategies, with which the setpoint generator is supplied. The selection of a defined directional strategy thus leads to the specification of corresponding data from the module 7 to the setpoint default 5 and on to the machine control 4 ,

In addition, can be set by the individual control of the left or right straightening roller drive L _n , R _n a targeted distribution of the drive parameters, so that the drives are synchronized or controlled with an intended specified trim or regulated. Thus, it is possible to specify the directional influence on the material to be straightened.

Particularly advantageous is the individual control of the two drives of each straightening roller with respect to a load balancing control of two adjacent straightening rollers. This can be positive effects on the life of the drives achieved by a targeted torque distribution.

The integration of the drive control in a control, ie the adaptation of the manipulated variables torque Md or speed n is shown on the right side of the figure. The powertrain becomes the measured variables Md and or n through the sensor 6 determined and as set / actual value comparison to the machine control 4 which corrects the control deviation. This individual control is intended for every right-hand and left-hand drive. Only for reasons of clarity, this control loop is in the representation of 1 limited to drive R1.

The proposed roller straightening machine 1 may have various concepts and corresponding specific design details for changing the rollers. For this purpose, it is useful (but not necessarily required) to set the drives, at least the side to which the roll change should take place, on a common Grundrahen to as simple as possible, in a block to realize the proposed process. It can be provided an exchange of all rolls or individual rolls. In any case, the roller or the entire set of rollers must be decoupled from their drives, on both sides and for those rollers that are to be removed from the range of straightening machine.

For the roll change, the drive of one side (individually or for the entirety of all rolls) is removed from the roll change zone. For this purpose, the drive is moved depending on the space conditions of the system layout in the direction of the roll axis and / or transversely, so that the space in front of the straightening machine is free to remove the set of rollers or a single roller and a new roll or a set of rolls in to introduce the leveler.

Subsequently, the drive is returned to its operating position, coupled the straightening rollers to the drives and the straightening machine is ready for operation.

The proposed roller leveler can be used to process sheets, strips and cutouts thereof. The material thicknesses are preferably between 1 mm and 70 mm, more preferably between 1 mm and 30 mm; the maximum material thickness is 150 mm.

The material width is preferably between 600 mm and 6,000 mm; the maximum material width is 7,000 mm. The material temperature during processing in the roller leveler is less than 600 ° C. The yield strength of the material is preferably above 460 MPa, in particular above 800 MPa.

LIST OF REFERENCE NUMBERS

1

Roller straightener

2

straightening roll

3

rotary drive

4

machine control

5

Sollwertvorgeber

6

sensor

7

Module for storing directional strategies

L ₁ , L ₂ , ..., L _n )

first rotary drive

R ₁ , R ₂ , ..., R _n )

second rotary drive

F

conveying direction

Md

torque

n

Rotational speed

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 1930349A [0004]
• KR 101508711 B1 [0006]

Claims (10)

A roll leveling machine (1) having a set of upper and lower straightening rolls (2), each straightening roll (2) being provided with a rotary drive (3) to rotate the straightening roll (2) caused by a machine control (4) and so on to be directed metallic flat material in a conveying direction (F) to promote and thereby to judge, characterized in that each straightening roller (2) has a first rotary drive (L ₁ , L ₂ , ..., L _n ) having the one axial end the straightening roller (2) can rotate, and a second rotary drive (R ₁ , R ₂ , ..., R _n ) which can rotate the other axial end of the straightening roller (2), wherein the machine control (4) is formed, the respective first and second rotary drives (L ₁ , L ₂ , ..., L _n , R ₁ , R ₂ , ..., R _n ) after setting a value individually with a rotational movement of the straightening roller (2) determining parameters apply. Roller straightening machine after Claim 1 , characterized in that the machine control (4) with a setpoint default (5) is in connection, for all rotary actuators (L ₁ , L ₂ , ..., L _n , R ₁ , R ₂ , ..., R _n ) specifies the parameters for the rotational movement of the straightening rollers (2). Roller straightening machine after Claim 1 or 2 , characterized in that the machine controller (4) is formed, the respective first and second rotary actuators (L ₁ , L ₂ , ..., L _n , R ₁ , R ₂ , ..., R _n ) with a predetermined torque (Md) to apply. Roller straightening machine according to one of Claims 1 or 2 , characterized in that the machine controller (4) is formed, the respective first and second rotary actuators (L ₁ , L ₂ , ..., L _n , R ₁ , R ₂ , ..., R _n ) with a predetermined rotational speed (n) to act on. Roller straightening machine according to one of Claims 1 to 4 , characterized in that the machine control (4) is designed to control the rotational movement of the straightening roller (2) determining parameters in the closed loop. Roller straightening machine after Claim 5 , characterized in that in the region of the first and second rotary drives (L ₁ , L ₂ , ..., L _n , R ₁ , R ₂ , ..., R _n ) sensors (6) for the detection of the torque (Md ) and / or the rotational speed (s) are arranged, which are in communication with the machine control (4). A method of operating a roller leveler (1) comprising a set of upper and lower straightening rollers (2), each straightening roller (2) being provided with a rotary drive (3) for causing the straightening roller (2) to be actuated by a machine controller (4) ) and thus to convey a metallic flat material to be straightened in a conveying direction (F) and thereby to direct it, characterized in that each straightening roller (2) has a first rotary drive (L ₁ , L ₂ , ..., L _n ) which rotates the one axial end of the straightening roller (2), and a second rotary drive (R ₁ , R ₂ , ..., R _n ), which rotates the other axial end of the straightening roller (2), via the machine control ( 4) for the respective first and second rotary drives (L ₁ , L ₂ , ..., L _n , R ₁ , R ₂ , ..., R _n ) individual values for at least one of the rotational movement of the straightening roller (2) determining parameters be specified. Method according to Claim 7 , characterized in that the machine control (4) is selectively operated in one of the following operating modes: a) operating only the first rotary drives (L ₁ , L ₂ , ..., L _n ) of the straightening rollers (2); b) operating only the second rotary actuators (R ₁ , R ₂ , ..., R _n ) of the straightening rollers (2); c) operating both the first rotary actuators (L ₁ , L ₂ , ..., L _n ) and the second rotary actuators (R ₁ , R ₂ , ..., R _n ) of the straightening rollers (2). Method according to Claim 7 or 8th , characterized in that the machine control (4) from a setpoint preselector (5) setpoints for the parameters for the rotational movement of the straightening rollers (2) are specified. Method according to Claim 9 , characterized in that the setpoint generator (5) is connected to a module (7) in which a number of different straightening strategies are stored, wherein for each straightening strategy a data set for the parameters for the rotational movement of the straightening rollers (2) is present, the module (7) predefines the setpoint generator (5) with the data set in accordance with a selected directional strategy.

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