EP3210681A1 - Device and method for rolling a strip of material with variable thickness - Google Patents

Abstract

The invention relates to a device for rolling strip material (1) with periodically variable strip thickness, wherein the device comprises a rolling stand (3) with a set of rollers and a Anstellsystem (6) for adjusting the roll gap of the set of rolls, which roll gap, the strip material (1) an output thickness is supplied on the input side of a take-off reel (7) and from which the strip material (1) with the respective desired final thickness on the output side of a reel (8) is supplied, both between the uncoiler (7) and the rolling stand (3) as between the rolling stand (3) and the reel (8) is arranged a roller assembly with a dipping roller (9, 10) around which the strip material (1) is guided, and the dipping rollers (9, 10) at a constant roller speed of the nip determining rollers (4, 5) of the roll stand (3) in dependence on the position of the rollers (4, 5) are position-controlled to the speed changes of the rolled good s at the inlet and at the outlet of the roll stand (3) to compensate, and the uncoiler (7) and the reel (8) are operated zuggeregelt, so that the winding lines of the strip material (1) are kept constant.

Description

The invention relates to a device for rolling strip material with periodically varying strip thickness, wherein the apparatus comprises a roll stand with a set of rollers and a Anstellsystem for adjusting the roll gap of the set of rolls, which roll gap, the strip material is fed with an output thickness on the input side of a spool and from which from the strip material with the respective desired final thickness on the output side of a reel is supplied.

Furthermore, the invention relates to a method for operating a device for rolling strip material with periodically varying strip thickness, wherein the apparatus comprises a roll stand with a set of rollers and a Anstellsystem for adjusting the roll gap of the set of rollers, wherein the roll gap, the strip material with an output thickness on the input side of a Uncoiler is supplied from and from which the strip material with the respective desired, by the Walzspalt certain end thickness on the output side of a coiler is supplied.

A device of the generic type and a method of the generic type are known in the art. In such devices or methods usually strip materials are processed from steel strip material. In particular, from the EP 1 121 990 B2 a generic device known. In this case, a possibility is shown in the prior art, with the wound in an economic manner to coils wound metal strips under train, reduced in thickness and then wound up again under train, wherein on the inlet side, a relatively constant strip thickness is provided and a periodic variable strip thickness to be achieved on the outlet side. In the cited document, this is achieved in that between Abhaspel and rolling mill and between the rolling mill and the coiler each a balancing or dancer roll is arranged around which the strip material is looped around and the force at a constant peripheral speed of the roll gap determining rollers of the rolling mill to apply a wanted strip tension. It is also necessary that the reels are speed-controlled.

Although this proposed device is useful in principle, but in particular the force control of balancing or dancer rolls is possible only with a relatively large amount of time, so that rolling errors due to the periodically variable Tape thickness can not be compensated fast enough. As a result, bands of periodically varying tape thickness produced by the apparatus are defective due to the high tape speeds.

Also, the speed control of the reels is expensive and can also lead to errors in the operation of the corresponding device.

Based on this prior art, the present invention seeks to provide an alternative solution for a corresponding device or a corresponding method available, the or the features of the force control of a balance or dancer role and a speed control of the reels no Use makes and achieves a faster automatic adjustment of the roll gap and thus a high quality of a periodically variable band material in adaptation to the high belt speeds, taking into account the different belt speeds at the inlet and outlet of the roll gap.

To achieve this object, the invention proposes that both between the reel and the rolling stand and between the rolling stand and the coiler, a roller assembly is arranged with a dipping roll around which the strip material is guided, and that the dipping rolls at a constant roll speed of the nip determining rollers of the roll stand in dependence on the employment of Rolls are position controlled to compensate for the changes in speed of the rolling stock at the inlet and at the outlet of the rolling stand, and that the uncoiler and the coiler are operated zuggeregelt.

According to the invention, the dipping rollers are position-controlled directly by the adjustment of the nip, which results in a result in a significantly faster correct setting with changing nips and to an exact rolling result. In addition, both the uncoiler and the coiler operated zuggeregelt, which is particularly advantageous for the use of the device.

In addition, it is preferably provided that before each dipping roll and behind each dipping roll a support roll for the strip material is arranged, over which the strip material is guided, and that each support roll has a strip length detection device and / or a belt speed monitoring device.

Such an arrangement and configuration, it is possible to control the position of the dipping roller not only in dependence on the setting of the roll gap, but in addition, the respectively produced strip length and the belt speed in the adjustment of the dipping roll is taken into account. This leads to an even better result with respect to the rolling process.

In addition, it can be provided that the uncoiler and the coiler are provided with a tension measuring device, by means of which the power supply to the drive motors of the reels can be regulated.

In particular, it can also be provided that a machine control is provided, which detects the employment of the rollers for a predeterminable nip and by means of which the dipping rollers are position-controllable in dependence thereon.

In addition, it is preferably provided that the rolls of the rolling stand which determine the roll gap circulate at a constant roll speed.

A method according to the invention is characterized in that both between the uncoiler and the rolling stand and between the rolling stand and the coiler a roller arrangement is arranged with a transverse adjustable to the direction of the strip material dipping roller around which the strip material is guided, wherein the dipping rollers in dependence the position of the rolls of the rolling stand are position-controlled, so that are compensated by the change in position speed changes of the rolling stock at the inlet and at the outlet of the rolling stand, and that the uncoiler and the coiler are operated zugeregelt.

In this case, it is preferably provided that the strip length and the speed of the continuous strip material are detected in front of and behind each dipping roller and fed to a controller for the rolling mill Position detection and / or correction of the position of the dipping rollers are generated.

Furthermore, it is preferably provided that for the purpose of tension control of the reels, the tensile forces of the reels detected and the data collected are fed to a control device by means of which the power supply to the drive systems of the reels is controlled such that the reel train adapted in each case to the requirements of the operating parameters becomes.

It is also preferably provided that the setting of the rollers for a predetermined roll gap detected and these are supplied as signals of a control device by means of which the dipping rollers are placed in a roll gap associated in the control as a data pattern stored target movement.

Furthermore, it is preferably provided that the rolls of the roll stand determining the roll gap are operated at a constant roll speed.

Figur 1

eine schematische Darstellung einer Vorrichtung zum Walzen von Bandmaterial in Seitenansicht;

Figur 2

Besonderheiten einer erfindungsgemäßen Ausgestaltung;

Figur 3

weitere Einzelheiten der erfindungsgemäßen Ausgestaltung.

An embodiment of the invention is illustrated in the drawing and described in more detail below. It shows:

FIG. 1

a schematic representation of an apparatus for rolling strip material in side view;

FIG. 2

Special features of an embodiment according to the invention;

FIG. 3

further details of the embodiment according to the invention.

In FIG. 1 In general, a device according to the invention for rolling strip material 1 with periodically variable strip thickness is shown. The device is shown schematically in side view. The direction of passage of the strip material is indicated at 2. The apparatus comprises a roll stand 3, of which the essential components, namely a roll set with two rolls 4 and 5 is shown. Furthermore, a positioning system 6 is shown schematically, which is designed to adjust the roll gap of the set of rollers 4, 5.

The nip, in particular in FIG. 2 and 3 is clearly visible, is set according to the desired band thickness to be generated. The strip gap 1, the strip material is fed with an initial thickness on the input side of a take-off reel 7 and from the nip of the strip material 1 with the respective desired final thickness on the output side of a reel 8 is supplied. Both between the uncoiler 7 and the rolling stand 3 and between the rolling stand 3 and the reel 8, a roller assembly with at least one dipping roller 9 and 10 is arranged. In addition to the dipping rollers 9 and 10, which are movable in the direction of the movement arrows 11 and 12, tape guide rollers 13, 14, 15, 16 are arranged, wherein between the guide roller 13 and the take-off reel 7 another guide and guide roller 17 and also between the guide roller 16 and the coiler 8 another guide and guide roller 18th arranged. The continuous strip material 1 is guided around the rollers 17, 13, 9, 14 and 15, 10, 16, 18, respectively.

The dipping rollers are seen by means of an actuator 19 and 20 in the direction of the movement arrows 11 and 12 up or down in the plane of the drawing adjustable and are at constant roller speed of the roll gap determining rollers 4, 5 of the roll stand 3 in dependence on the Positioning of the rollers 4, 5 controlled to compensate for the changes in speed of the rolling stock, ie the strip material 1, at the inlet and at the outlet of the roll stand 3. The uncoiler 7 and the reel 8 are operated zuggeregelt.

The upstream of each dipping roller 9 and behind each dipping roll 10 arranged support rollers 13, 14 and 15, 16, over which the strip material 1 is guided, each have a tape length detection device and a belt speed monitoring device 21, 22 and 23, 24. Further, the uncoiler 7 and the coiler 8 are each provided with a tension measuring device ZM, by means of which the power supply, which is indicated at 25, 26, to the drive motors MA of the reels 7, 8 is adjustable to the reel train adapted to the requirements of the operating parameters to keep.

Furthermore, a machine control 27 is provided which detect and process or store the setting values for the setting of the rolls 4, 5 for a predeterminable roll gap and by means of of which the dipping rollers 9, 10 are position-controllable depending thereon. For this purpose, the machine control communicates 27 with the Anstellsystem 6, with the tape length detection devices and belt speed monitoring devices 21, 22, 23, 24 with the adjusting devices 19, 20 for the dipping rollers 9, 10, so that by means of the machine control 27, the employment of the rollers 4, 5 for the detected predetermined roll gap and the dipping rollers 9, 10 are position-controlled in dependence thereon.

The roller gap determining rollers 4, 5 of the roll stand 3 are operated at a constant roller speed. In the drawing are in FIG. 1 above the areas of constant speed of the strip material 1 and variable speed of the strip material 1 on the inlet side and outlet side indicated with v _E = constant, v _E = variable, v _A = variable and v _A = constant.

The entire area from the uncoiler 7 to the rolling mill 3 is referred to as the lead-in area and the area from the rolling stand 3 to the reel 8 as the lead-out area.

The speed changes of the rolling stock (strip material 1) resulting from the rolling of periodically variable strip thicknesses at a constant roll speed in the inlet and outlet of the roll stand 3 are compensated by the movement of the two dipping rolls 9 and 10. The dipping rollers 9, 10 are position-controlled. The control takes place directly from the employment of the rollers 4, 5 in Connection with signals to the rolled strip length. The operation of the two reels 7 and 8 is zuggeregelt.

The aim is to derive the movement of the dipping rollers 9, 10 directly from the operating parameters of the rolling process. In this way, the direction of movement and the type of movement (constant speed, acceleration or deceleration) of the dipping rollers 9, 10 should be determined by the profile of the rolled material.

As regards the control of the dipping roller movement, this is derived directly from the signals for the roller adjustment and the band length signals, which are detected by means of the detection devices 21, 22, 23, 24.

The movement of the dipping rollers 9, 10 takes place periodically. Each period of the dipping rollers 9, 10 in the inlet and outlet is assigned to exactly one rolling period.

For further explanation will now be to the Figures 2 and 3 Referenced.

In order to be able to assign the movement T of the dipping rollers 9, 10 exactly, the profile of the rolled material of a rolling period L is subdivided into segments. The individual segments each comprise areas with constant strip thickness (a with s ₁ and b with s ₂ ) and with variable strip thickness (Y and Z). By determining the individual cross-sections can always be a segment in the outlet a cross-sectional equal and thus massegleiches segment in the roll inlet are assigned (a _E and b _E and y _E and z _E with the input tape thickness s). The result for a rolling period L is the mass of the same length in the inlet L _E.

From the individual segments of a rolling period, an average band thickness s _M in the outlet can be calculated. This average strip thickness is equivalent to the average speed in the roll outlet (V _AM ) and thus also determines the average speed in the inlet (V _EM ). The reel speeds in the inlet and outlet then each correspond to these average speeds, as if under constant conditions the incoming strip of thickness s would be rolled down to the thickness s _M.

The segment-by-segment analysis of the ratios between the average strip thickness and the thickness in a segment allows a conclusion about the respective speed ratio. The greater the differences in thickness, the greater the speed difference in this segment of the roll outlet.

For the roller inlet, the movements of the roller adjustment and thus the rolling profile are also decisive for the current speed. At constant roll speed and consistent traction, the infeed speed is higher with a low pass decrease than with a large pass decrease. The segments in the outlet can always be cross-sectionally equal segments in the roll inlet assign. From the segments of a complete period, it is then possible to determine both an average speed in the inlet and to determine the movement of the dipping rollers 9, 10 according to segments.

The type and direction of the Tauchrollenbewegungen 11, 12 (constant speed up / down, deceleration, dead center or acceleration) thus result from the rolling parameters. In order to assign the movement of the dipping rollers 9, 10 exactly to the rolling process, the outgoing rolling profile of a period L is compared in segments with a volume equal section of equal length L with the average thickness s _M.

The segment b is thicker than the average thickness s _M with the thickness s ₂ . This means that the speed of the outgoing band v _{A2 is} less than the average speed v _AM . To compensate for this, a constant upward movement of the dipping roller is required. The segment Z is divided into two sections (Z ₁ and Z ₂ ) by crossing the thickness of the medium-thickness rolled profile. In the area Z ₁ , the thickness is reduced to the average thickness. This means that the speed of the outgoing band is accelerated, up to the average speed v _AM . At the crossing point, the average speed and the speed of the outgoing band are identical. For the dipping roll this results in that the upward movement of the dipping roll is braked and in the crossing point the roll reaches its top dead center. In the area Z ₂ , the thickness continues reduced to the thickness s ₁ . The speed of the outgoing belt is accelerated up to the speed v _A1 . The dipping roller is accelerated downwards in this area.

The segment a is thinner than the average thickness s _M with the thickness s ₁ . The speed of the outgoing band v _A1 is thus greater than the average speed v _AM . The dive roller compensates for this by a constant downward movement.

For the segment Y, the speed of the outgoing band is reduced to the speed v _A2 . In the area Y ₁ , the downward movement is slowed down to the bottom dead center and in the area Y ₂ the dipping roller is accelerated upward again. The control of the dipping roller movement in the inlet follows the dipping roller control of the outlet.

In the segment b _E the speed of the incoming band v _{E2 is} higher than the average speed and in the segment a _E the speed v _{E1 is} lower.

The dipping roller movement compensates for this and goes upwards in the segment b _E at constant speed and also downwards in the segment a _E. The segments Z _E and Y _E are also characterized by braking, dead center and acceleration. The dead points are each controlled simultaneously with the outlet-side dead centers.

In order to monitor and, if necessary, correct the movements of the dipping rollers, the rollers in each case before the inlet and after the exit of a dipping roller are provided with pulse detectors for the detection of the belt lengths and the speed.

The signals for the dipping roller movement can therefore be matched exactly to the roller adjustment and thus to the rolled section.

Corrections may be necessary, for example, if during very rapid movements of the roll adjustment, the influence of the roll diameter is so large that the additional in the inlet displaced or released material shares affect the Tauchrollenbewegung or if thickness deviations of the strip influence the rolling process.

Since the movement of the dipping rollers can be adapted very precisely to the roller adjustment and thus to the respective profile change, a constant winding speed and thus an exact tension control for both reels is possible without problems.

It remains to be noted that the operations shown in the embodiment are only an example. There are also more than four segments possible for a rolling period.

The invention is not limited to the embodiments, but in the context of the disclosure often variable.

All disclosed in the description and / or drawing single and combination features are considered essential to the invention.

Track directory:

1

band material

2

Movement direction of 1

3

rolling mill

4

roller

5

roller

6

adjustment system

7

uncoiler

8th

coiler

9

diving role

10

diving role

11

Movement direction of 9

12

Movement direction of 10

13

idler pulley

14

idler pulley

15

idler pulley

16

idler pulley

17

leadership

18

leadership

19

Setting device of 9

20

Actuator of 10

21

Tape length detection and tape length speed monitoring device

22

Tape length detection and tape length speed monitoring device

23

Tape length detection and tape length speed monitoring device

24

Tape length detection and tape length speed monitoring device

25

Power supply of 7

26

Power supply of 8

ZM

tensile gauge

MA

drive motor

27

machine control

T

Movement of dipping rollers

L

rolling period

Claims (10)

Device for rolling strip material (1) with periodically variable strip thickness, the device having a roll stand (3) with a set of rolls and a positioning system (6) for setting the roll gap of the roll set, which roll gap has the strip material (1) with an initial thickness on the input side a rewinder (7) is fed from and from which the strip material (1) with the respective desired final thickness on the output side of a reel (8) is fed, characterized in that both between the uncoiler (7) and the rolling stand (3) and between the rolling stand (3) and the reel (8) a roller assembly with a dipping roller (9, 10) is arranged, around which the strip material (1) is guided around, and that the dipping rollers (9, 10) at a constant roller speed of the nip determining rollers (4, 5) of the roll stand (3) in dependence on the position of the rollers (4, 5) are position-controlled to the speed changes of the rolled good s at the inlet and at the outlet of the roll stand (3) to compensate, and that the uncoiler (7) and the reel (8) are operated zuggeregelt. Apparatus according to claim 1, characterized in that before each dipping roll (9, 10) and behind each dipping roll (9, 10) a support roll (13, 14, 15, 16) for the strip material (1) is arranged, over which the strip material (1) is guided, and that each support roller (13, 14, 15, 16) a tape length detection device and / or a belt speed monitoring device (21, 22; 23, 24). Device according to one of claims 1 or 2, characterized in that the uncoiler (7) and the reel (8) are provided with a tension measuring device (ZM), by means of which the power supply to the drive motors (MA) of the reels can be regulated. Device according to one of claims 1 to 3, characterized in that a machine control (27) is provided which detects the employment of the rollers (4, 5) for a predeterminable roll gap and by means of which the dipping rollers (9, 10) position controllable in dependence thereon are. Apparatus according to claim 1 to 4, characterized in that the roll gap determining rollers (4, 5) of the rolling stand (3) rotate at a constant roller speed. Method for operating a device for rolling strip material (1) with periodically variable strip thickness, the device having a roll stand (3) with a set of rolls and a setting system (6) for adjusting the roll gap of the set of rolls, the strip gap comprising the strip material (1) is fed with an initial thickness on the input side of a spool (7) and from which the strip material (1) with the respective desired, determined by the nip end thickness on the output side of a reel (8), characterized in that both between the uncoiler (7) and the rolling stand (3) and between the rolling stand (3) and the coiler (8) has a roller arrangement with a transverse to the direction (2) of the strip material ( 1) adjustable immersion roller (9, 10) is arranged around which the strip material (1) is guided around, wherein the immersion rollers (9, 10) are position-controlled in dependence on the employment of the rollers (4, 5) of the roll stand (3), so that the changes in position speed changes of the rolling stock at the inlet and at the outlet of the roll stand (3) are compensated, and that the uncoiler (7) and the coiler (8) are operated zugeregelt. A method according to claim 6, characterized in that before and behind each dipping roller (9, 10) detects the tape length and the speed of the continuous strip material (1) and a controller (27) is supplied to the rolling mill, from the detected data signals for position detection and / or correcting the position of the dipping rollers (9, 10) are generated. Method according to one of claims 6 or 7, characterized in that for the purpose of tension control of the reels (7, 8) detects the tensile forces of the reels (7, 8) and the detected data are fed to a control device, by means of which the power supply to the drive systems the reels (7, 8) is controlled such that the Hoist is adapted to the requirements of the operating parameters. Method according to one of claims 6 to 8, characterized in that the employment of the rollers (4, 5) detected for a predetermined roll gap and these are supplied as signals to a control device (27), by means of which the dipping rollers (9, 10) in a assigned to the roll gap in the control stored as a data pattern target position can be adjusted. Method according to one of Claims 6 to 9, characterized in that the rolls (4, 5) of the roll stand (3) which determine the roll gap are operated at a constant roll speed.

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