EP1059126A2 - Method for controlling the tension between the rolling stands of rolling trains for steel bars, wires or profiles - Google Patents

Abstract

Regulating pull between roll stands of roll trains comprises quantitatively acquiring a fluctuation amplitude and fluctuation frequency during rolling rods or wires from the fluctuations that the rod or wire produce between two subsequent roll stands, and determining a pull and/or the pressure prevailing in the rolling stock between the roll stands by comparing with identification points.

Description

The invention relates to a method for tension control between the rolling stands of roller mills for steel bars, wire or profiles with control of the drive speeds successive roll stands.

Tensile and compressive forces influence both the tolerances of the dimensions of the cross section of the rolling stock strands, as well as the uniformity of the rolling process itself. An effective train control, by means of which in particular prevented is that in the rolling stock pressure builds up in the longitudinal direction is therefore of great importance. Various tension control methods are known from the prior art for rolling mills. One method is the To calculate quotients of rolling moment and rolling force and from this to the Close rolling stock prevailing train. Furthermore, an advance method is known at the speed differences of the rolling stock between successive Scaffolds are evaluated. Next are loop regulations known, where the loop height is a measure of the tension or pressure forms in the rolling stock.

It is also known (DE-OS 1 602 020) in two successive roll stands on the first scaffold, measurements equivalent to the train, such as the load current of the Determine the rolling mill drive, compare it with a fixed experience value and the resulting deviations for regulating the regulating and control devices of the drive of the following second mill stand. In another method (DE 4 220 121), that with only one comparison value works and takes into account only one point of the load current profile of the rolling mill drives, can change the temperature structure over the length of the rolling stock not recorded and therefore not used for control purposes. An other suggestion (DE-OS 2 448 033 and DE-PS 38 06 063), the ratio of the armature current of the drive to the rolling force resulting from the deformation in the roll gap To use pressure transducers installed in the roll stand as a control variable, did not prevail in practice because of the arrangement and reliability of the Pressure measuring devices, especially their maintenance, difficulties that have not yet been remedied brought with it. Also a suggestion, the load current values of the downstream devices to be recorded and in each case with the recorded and stored values from the to compare previous scaffolding and a relative comparison value Training for rule corrections did not prevail in practice.

The invention is based, so the generic method task improve that the tension control between the stands of the rolling mill with the help simple, commercially available measuring and computing devices arranged outside the scaffolding can be achieved.

This object is achieved in that when rolling rods or wires of the vibrations that the rod or wire between two successive Rolling stands performs at least one property of the vibrations quantitatively recorded and by comparison with characteristics from it, in the rolling stock, tension or pressure prevailing between the scaffolding is determined, and one of the Roll stands are adjusted in such a way that there is in the rolling stock between the roll stands builds up a debit train.

As the invention further provides, a vibration detection device can be installed between the roll stands for quantitative recording of at least one characteristic Property of a vibration of the rolling stock transverse to a direction of transport be arranged from the front to the rear roll stand and this be connected to a train detection device, by means of which by comparison with characteristics a train prevailing in the rolling stock between the rolling stands or pressure can be determined.

The characteristic property of the vibration can be the frequency and / or be the amplitude of the vibration. The roll stand can be readjusted, for example in that due to a difference between prevailing Tension or pressure and target tension the readjusted roll stand with an additional speed setpoint is applied.

If the characteristic property of the vibration using a camera device is detected, the at least one at least one-dimensional dynamic Image of the rolling stock transversely to the direction of transport is the capture of the characteristic property particularly simple.

If the camera device has two at least one-dimensional dynamic images of the rolling stock transversely to the direction of transport, the images from each other the vibration is independent exactly detectable from their vibration level. A variation of the vibration level can arise in particular in the case of rod-shaped rolling stock.

If at least one dimension of the rolling stock is obtained using the dynamic images determined transversely to the direction of transport is an even better determination of the possible in the rolling stock between the rolling stands prevailing train or pressure. In addition, it is possible that due to the specific dimension of the Rolled stock at least one control parameter of the front roll stand, in particular a speed or a nip is varied. For rod-shaped rolling stock the determined dimension preferably the profile width, since this is more sensitive to tension than the profile height.

If the camera device is arranged in a frame that can be moved as a unit is, the camera device is in a particularly simple manner from the rolling mill extendable.

When the frame is closed, there is overpressure inside and the interior is cooled, the camera device is particularly reliable and reliable operable.

The characteristics may have been theoretically determined beforehand. Preferably but there is a gradual self-calibration.

• daß nach dem Einlaufen der Walzgutspitze in das vordere Walzgerüst und vor dem Einlaufen der Walzgutspitze in das hintere Walzgerüst ein von dem vorderen Walzgerüst aufgebrachtes vorderes Freimoment erfaßt wird,
• daß nach dem Einlaufen der Walzgutspitze in das hintere Walzgerüst ein von dem vorderen Walzgerüst aufgebrachtes vorderes Zugmoment erfaßt wird,
• daß aus einem Vergleich von vorderem Freimoment und vorderem Zugmoment ein in dem Walzgut herrschender Zug ermittelt wird und
• daß der Zug und die bei diesem Zug gemessene charakteristische Eigenschaft der Schwingung als Kennpunkt im einem Speicher abgespeichert wird.

The rolling stock has a rolling stock tip. The self-calibration can therefore be carried out, for example, by

• that after the rolling stock tip has entered the front rolling stand and before the rolling stock tip has entered the rear rolling stand, a front clearance applied by the front rolling stand is detected,
• that after the rolling stock tip has entered the rear roll stand, a front tensile moment applied by the front roll stand is detected,
• that a train prevailing in the rolling stock is determined from a comparison of the front clearance torque and the front tension torque and
• that the train and the characteristic property of the vibration measured during this train is stored as a characteristic point in a memory.

• daß nach dem Auslaufen des Walzgutendes aus einem dem vorderen Walzgerüst unmittelbar vorgelagerten Vorgerüst und vor dem Auslaufen des Walzgutendes aus dem vorderen Walzgerüst ein von dem hinteren Walzgerüst aufgebrachtes hinteres Zugmoment erfaßt wird,
• daß nach dem Auslaufen des Walzgutendes aus dem vorderen Walzgerüst ein von dem hinteren Walzgerüst aufgebrachtes hinteres Freimoment erfaßt wird,
• daß aus einem Vergleich von hinterem Freimoment und hinterem Zugmoment ein in dem Walzgut herrschender Zug ermittelt wird und
• daß der Zug und die bei diesem Zug gemessene charakteristische Eigenschaft der Schwingung als Kennpunkt im einem Speicher abgespeichert wird.

The rolling stock also has a rolling stock end. Self-calibration can therefore also be carried out by

• that after the end of the rolling stock has run out of a roughing stand directly upstream of the front rolling stand and before the end of the rolling stock has run out of the front rolling stand, a rear tensile moment applied by the rear rolling stand is detected,
• that after the end of the rolling stock has run out of the front roll stand, a rear clearance torque applied by the rear roll stand is detected,
• that a train prevailing in the rolling stock is determined from a comparison of the rear clearance torque and the rear tension torque and
• that the train and the characteristic property of the vibration measured during this train is stored as a characteristic point in a memory.

If, in addition, a temperature prevailing in the rolling stock is also recorded and stored is connected with the quality of the rolling stock a complete, reproducible information about the characteristic point is available.

When rolling profile bars, the invention provides that between two successive Scaffolding the profile of the rod measured with profile measuring devices and the values of the respective flange widths detected by these in a computing device compared with predetermined fixed values, to correct the Speed control values of the following stands are used. The values of Flange widths recorded by the profile measuring devices can have values of Flange widths are compared, that of the two mill stands upstream other profile measuring devices were detected. You can also use the Flange width of profile measuring laser measuring devices or line cameras used become. Another possibility according to the invention consists in Arrangement of the measuring devices in one, from an input-side universal scaffold, an intermediate compression stand and an exit-side universal stand Compact roller group between the universal stand and a first measurement of the flange width of the Compact rolling group to run incoming profile strand before this has reached the universal scaffolding on the output side, which is then followed by a second measurement, when the universal scaffold on the output side has gripped the profile strand.

This procedure takes advantage of the changes in the dimensions of the profile cross section from the tension acting on the profile bar between two roll stands surrender. This change occurs with beams and similar profiles whose flange width is particularly clear and can be used with the specified Means can be precisely recorded in a simple manner.

Figur 1

einen Ausschnitt einer mehrgerüstigen Walzstraße,

Figur 2

eine Schwingungserfassungseinrichtung mit erfaßtem Walzgut,

Figur 3 u. 4

Antriebsmoment-Zeit-Diagramme,

Figur 5

eine Walzgerüstanordnung zum Walzen von Profilstäben in schematischer Darstellung, und

Figur 6

einen Schnitt nach der Linie A-A durch Fig. 5.

The inventions are explained below with reference to exemplary embodiments shown in the drawing. The drawings show:

Figure 1

a section of a multi-stand rolling mill,

Figure 2

a vibration detection device with detected rolling stock,

Figure 3 u. 4th

Drive torque-time diagrams,

Figure 5

a roll stand arrangement for rolling profile bars in a schematic representation, and

Figure 6

a section along the line AA through Fig. 5th

According to FIG. 1, a rolling mill for a rolling stock 1 has a front roll stand 2 and a rear roll stand 3. The rolling stock is transported in a transport direction x transported from the front to the rear roll stand 2, 3. The rolling stock leads 1 between the roll stands 2, 3 an oscillation with an oscillation amplitude A and an oscillation frequency f transverse to the transport direction x.

According to Figure 1, the front roll stand 2 is designed as a vertical stand, while the rear roll stand 3 is designed as a horizontal stand. In the mill stands 2, 3 is therefore a rod-shaped rolling stock 1, z. B. bar steel or wire, rolled. The rolling stock 1 could also be a strip. The rolling stock 1 can Steel, copper, aluminum, brass or any other metal.

A vibration detection device 4 is located between the roll stands 2, 3 arranged. The vibration amplitude is determined by means of the vibration detection device 4 A and the oscillation frequency f of the oscillation, ie its characteristic properties, quantifiable.

The detected vibration frequency f and the detected vibration amplitude A become a tension detection device 5 supplied with which the vibration detection device 4 is connected. The train determination device 5 compares the detected vibration amplitude A and the detected vibration frequency f with Characteristics that are stored in a memory 6. It determines from this a train Z that prevails in the rolling stock 1. If the determined value of the train Z is negative there is 1 pressure in the rolling stock.

The tension detection device 5 is control engineering with a tension control device 7 connected, which it feeds the train Z. The tension control device 7 is also a Target train Z * fed. The tension control device 7 determines on the basis of a difference between train Z and target train Z * an additional speed setpoint δn *, which they send to a Passes speed control device 8, which is connected to it in terms of control technology. The Speed control device 8 also becomes a target speed n * and - as an actual value - one Speed n supplied. The front roll stand 2 is therefore due to a difference between prevailing tension Z or pressure and target tension Z * with the additional speed setpoint δn * applied so that there is in the rolling stock 1 between the rolling stands 2, 3 the target train Z * builds up.

In principle, it is sufficient if a characteristic property of the Vibration, i.e. only the vibration amplitude A or only the vibration frequency f, is detected. However, the detection of both properties A, f is special It is an advantage because then a mutual plausibility check of the two recorded properties A, f is possible.

The vibration detection device 4, by means of which the characteristic property (s) A, f of the vibration can be detected, for example, as a camera device 4 be formed. Commercial CCD cameras, for example deliver at least one-dimensional dynamic images with a resolution of 5000 pixels at a frame rate of 50 Hz. This is sufficient for many applications. If necessary, CCD cameras with higher frame rates can also be used up to 2 kHz can be used.

According to FIG. 2, the camera device 4 has two cameras 9, 10, which are under different image directions are arranged with respect to the rolling stock 1 .are. The images that the cameras 9, 10 deliver transversely to the transport direction x are thus taken from different image directions. in the In individual cases, however, the use of only one camera 9 or 10 can suffice his.

It is possible for the images recorded by the cameras 9, 10 in an evaluation device 11 only with regard to the characteristic properties A, f evaluate the vibration. However, width b and Height h of the rolling stock 1 also recorded. So it is by means of dynamic images the dimensions h, b of the rolling stock 1 determined transversely to the transport direction x. The train prevailing in the rolling stock 1 can also be measured from the dimensions h, b Z can be determined.

As a rule, it is sufficient to determine the tension Z prevailing in the rolling stock 1 Evaluation of the frequency f of the vibration. Especially with a very small train Z or with pressure, however, the amplitude A of the vibration also takes large values , so that with a small train Z and with pressure the amplitude A is also sensibly evaluated can be.

The evaluation of frequency f and amplitude A of the vibration becomes unreliable, if the roll stands 2, 3 are operated at a speed n, which in Resonance frequency range of the rolling stock 1 is. Because of the small amplitude A Vibration is the evaluation of frequency f and amplitude A of the vibration also unreliable even if the rolling stock 1 has a large cross section having. In this case, however, it is easy to determine what prevails in the rolling stock 1 Zug Z possible based on the width b.

As a result, with only one sensor, namely the camera device 4, despite variable operating conditions through appropriately adapted evaluation of the signal supplied by the camera device 4 is always reliable in the Rolling stock 1 prevailing train Z can be determined.

Due to the determined height h and the determined width b of the rolling stock 1 also at least one control parameter of the front roll stand 2 varies. For example, it is possible to define the roll gap s by specifying a to vary the new target roll gap s * accordingly. This is the camera device 4 with a roll gap control device 8 'for the front roll stand 2 in terms of control technology connected. Also, due to the dimensions h, b detected Rolled stock 1 speed control of the front roll stand 2 take place.

According to FIG. 2, the camera device 4 is in a closed frame 12 arranged. Inside the frame 12 there is overpressure, so that contamination cannot get inside the frame 12. Furthermore, that Inside of the frame 12 cooled by means of a cooling device 13 so that the inside of the frame 12 arranged components 9, 10, 11 work reliably. The frame 12 is, as indicated in FIG. 2 by a double arrow, as Unit can be moved out of the rolling mill. Dismantling in the rolling mill is therefore not necessary.

The characteristic points on the basis of which the train Z is determined can be determined in advance and have been stored in memory 6. But it is also possible to use the characteristics to be determined experimentally and / or updated. To update in particular drive torques M2, M3 are evaluated, which are from the front or rear roll stand 2, 3 are applied in the start-up or run-down phase.

For example, the rolling stock 1 has a rolling stock tip 1 '. As long as the rolling stock tip 1 'is between the roll stands 2, 3, the rolling stock 1 of the front roll stand 2 transported draft-free to the rear roll stand 3. If on the other hand, the rolling stock tip 1 'has run into the rear roll stand 3 the rear roll stand 3 the train Z on the rolling stock section between the Exercise roll stands 2, 3.

According to FIG. 3, the rolling stock tip 1 'runs into the front roll stand at time T1 2 a. This running-in (= tapping) briefly causes a strongly fluctuating Driving torque M2 in the front roll stand 2. These strong fluctuations have ended at time T2. After this point in time T2 that will drive torque M2 applied by the front roll stand 2 is recorded several times, fed to a computing unit 15 and averaged. This mean is shown below front free moment called M2F.

At a point in time T3, the rolling stock tip 1 'runs into the rear roll stand 3. This again results in strong fluctuations in the front roll stand 2 applied drive torque M2. The strong fluctuations are too at a time T4. From this point in time T4, this is repeated several times drive torque M2 applied by the front roll stand 2, the computing unit 15 fed and averaged. This new mean is called the front one Tension moment M2Z designated.

From a comparison of the front clearance torque M2F and the front tension torque M2Z can the train Z prevailing in the rolling stock 1 from the computing unit 15 be determined.

At the same time as measuring the front tensile torque M2Z, the characteristic ones Properties A, f of the vibration of the rolling stock 1 and the Computing unit 15 supplied. Furthermore, a temperature detection device 14 detects a temperature T of the rolling stock 1 and supplies it to the computing unit 15. Vibration amplitude A, vibration frequency f, width b, height h, Temperature T and train Z are then used by the computing unit 15 as a characteristic point summarized and stored in memory 6. Possibly. can also the captured Rolling stock dimensions h, b can also be stored.

In an analogous manner, the outlet of the rolling stock 1 can also be used to determine Characteristics are used.

According to FIG. 4, the rolled material end 1 ″ runs out of the one at a time T5 front mill stand 2 immediately preceding rough stand 16. From this Time T5 becomes a driving torque applied by the rear roll stand 3 M3 recorded several times, fed to the computing unit 15 and averaged. The mean is referred to below as the rear tensile torque M3Z.

This moment detection and averaging is ended before the rolling stock ends 1 '' runs out of the front roll stand 2 at a time T6. To the end of the rolling stock 1 '' from the front roll stand 2 is again several times the drive torque M3 applied by the rear roll stand 3, supplied to the computing unit 15 and averaged. This new mean will hereinafter referred to as the rear release torque M3F. Acquisition and averaging is before a time T7, at which the rolling stock end 1 '' from the rear mill stand 3 ends.

By comparing the rear release torque M3F and the rear pull torque M3Z the train Z in the rolling stock 1 between the roll stands 2, 3 can be determined again become. As in the case of the rolling stock tip 1 ', the characteristic ones become analogous again Properties A, f of the vibration together with the dimensions h, b of the rolling stock 1 and the temperature T of the rolling stock 1 and the measured Train Z is stored by the computing unit 15 as a characteristic point in the memory 6.

With the tension control method according to the invention and the corresponding one Rolling mill can achieve a variety of advantages. One is in particular continuous draft control possible with minimal draft. The train control can also started in any sections of rolling stock between two roll stands 2, 3 become. The detected dimensions h, b of the rolling stock 1 are also for the Roll gap control can be used. In addition, the detection of the rolling stock 1 as such can also be used for material flow tracking. Finally is the train control method can be implemented cost-effectively and also with existing ones Rolling mills can be easily retrofitted.

As can be seen from FIGS. 5 and 6, there is the roll stand arrangement for rolling of profile bars, in particular H-beams from a compact rolling group, the one on the input side Universal scaffold UR and an output-side universal scaffold UF and has a compression frame E arranged between them. This compact rolling group is usually operated reversing. Between the input side Universal scaffold UR and the compression scaffold E is a measuring device MG arranged that (see Fig. 5) the height b of the two flanges FL1 and FL2, i.e. the width of the flanges of the profile bar PS determined from both sides. This Measured values determined are sent to a computing device in a manner not shown forwarded.

Reference list

1

Rolling stock

1'

Rolling tip

1''

End of rolling stock

2, 3, 16

Scaffolding

4th

Vibration detection device

5

Train determination device

6

Storage

7, 8, 8 '

Control devices

9, 10

Cameras

11

Evaluation device

12th

frame

13

Cooling device

14

Temperature detection device

15

Arithmetic unit

A

Vibration amplitude

b

width

f

Vibration frequency

H

height

M2, M2F, M2Z, M3, M3F, M3Z

Moments

n, n *, δn *

Speeds

s, s *

Nips

T

temperature

T1 - T7

Times

x

Direction of transport

Z, Z *

Trains

UR

Universal scaffold

UF

Universal scaffold

E

Compression frame

MG

Measuring device

FL1

flange

FL2

flange

PS

Profile bar

Claims (23)

1. method for tension control between the roll stands of roll trains for steel bars, wire or profiles with control of the drive speeds of successive roll stands,
characterized,
that when rolling rods or wires, the vibrations that the rod or the wire executes between two successive rolling stands (2, 3) quantitatively ascertains at least one property (A, f) of the oscillation and, by comparing them with characteristics, a result in the rolling stock ( 1) prevailing tension (Z) or pressure between the roll stands (2, 3) is determined, and a roll stand (2) of the two roll stands (2, 3) is readjusted in such a way that the rolling stock (1) between the roll stands ( 2, 3) builds a target train (Z *). 2. train control method according to claim 1,
characterized,
that the characteristic property (A, f) of the vibration is the frequency (f) and / or the amplitude (A) of the vibration. 3. train control method according to claim 1 or 2,
characterized,
that the readjusted roll stand (2) is subjected to an additional speed setpoint (δn *) due to a difference between the prevailing tension (Z) or pressure and target tension (Z *). 4. train control method according to claim 1, 2 or 3,
characterized,
that the characteristic property (A, f) of the vibration is recorded by means of a camera device (4) which provides at least one at least one-dimensional dynamic image of the rolling stock (1) transverse to the transport direction (x). 5. train control method according to claim 4,
characterized,
that the camera device (4) delivers two at least one-dimensional dynamic images of the rolling stock (1) transversely to the transport direction (x), the images being taken from different directions of the image. 6. train control method according to claim 4 or 5,
characterized,
that at least one dimension (h, b) of the rolling stock (1) transverse to the transport direction (x) is determined by means of the dynamic images. 7. train control method according to claim 6,
characterized,
that at least one control parameter (s *) of the front roll stand (2), in particular a roll gap (s *) or a speed (n), is varied on the basis of the determined dimension (h, b) of the rolling stock (1). 8. train control method according to one of the above claims,
characterized, that the rolling stock (1) has a rolling stock tip (1 '), that after the run-in of the rolling stock tip (1 ') into the front rolling stand (2) and before the running-in of the rolling stock tip (1') into the rear rolling stand (3), a front clearance (M2F) applied by the front rolling stand (2) is detected , that after the rolling stock tip (1 ') has entered the rear roll stand (3), a front tensile moment (M2Z) applied by the front roll stand (2) is detected, a train (Z) prevailing in the rolling stock (1) is determined from a comparison of the front clearance torque (M2F) and the front tension torque (M2Z) and that the train (Z) and the characteristic property (A, f) of the vibration measured during this train (Z) are stored as a characteristic point in a memory (6). 9. train control method according to one of the above claims,
characterized, that the rolling stock (1) has a rolling stock end (1 ''), that after the rolling stock end (1 '') has run out of a roughing stand (16) directly upstream of the front rolling stand (2) and before the rolling stock end (1 '') has left the front rolling stand (2), one of the rear rolling stand (3 ) applied rear tension torque (M3Z) is recorded, that after the end of the rolling stock (1 '') has run out of the front roll stand (2), a rear clearance torque (M3F) applied by the rear roll stand (3) is detected, a tension (Z) prevailing in the rolling stock (1) is determined from a comparison of the rear clearance torque (M3F) and the rear tension torque (M3Z) and that the train (Z) and the characteristic property (A, f) of the vibration measured during this train (Z) are stored as a characteristic point in a memory (6). 10. train control method according to claim 8 or 9,
characterized,
that in addition a temperature (T) prevailing in the rolling stock (1) is recorded and stored. 11. Rolling mill for rolling stock (1), in particular rod-shaped rolling stock (1), for. B. steel or wire, with a front and a rear roll stand (2, 3), a tension detection device (5) with a tension control device (7) for the rolling stock (1) between the roll stands (2, 3) is connected in terms of control technology,
characterized, that between the roll stands (2, 3) a vibration detection device (4) for quantitative detection of at least one characteristic property (A, f) of a vibration of the rolling stock (1) transverse to a transport direction (x) from the front to the rear roll stand (2, 3) is arranged that the vibration detection device (4) is connected to the tension detection device (5), and that a tension (Z) or pressure prevailing in the rolling stock (1) between the rolling stands (2, 3) can be determined by means of the tension determination device (5) by comparison with characteristic points. 12. rolling mill according to claim 11,
characterized,
that the characteristic property (A, f) of the vibration is the frequency (f) and / or the amplitude (A) of the vibration. 13. rolling mill according to claim 11 or 12,
characterized,
that the tension control device (7) for specifying an additional speed setpoint (δn *) is connected to a speed control device (8) for one (2) of the roll stands (2, 3) in terms of control technology. 14. rolling mill according to claim 11, 12 or 13,
characterized,
that the vibration detection device (4) is designed as a camera device (4), by means of which at least one at least one-dimensional dynamic image of the rolling stock (1) can be delivered transversely to the transport direction (x). 15. rolling mill according to claim 14,
characterized,
that the camera device (4) has two cameras (9, 10) which are arranged under different image directions with respect to the rolling stock (1). 16. rolling mill according to claim 14 or 15,
characterized,
that the camera device (4) is connected to a control device (8 ') for the front roll stand (2) in terms of control technology. 17. rolling mill according to claim 14, 15 or 16,
characterized,
that the camera device (4) is arranged in a frame (12) movable as a unit. 18. rolling mill according to claim 17,
characterized,
that the frame (12) is closed, there is overpressure in its interior and the interior is cooled. 19. Rolling mill according to one of claims 11 to 18,
characterized,
that a temperature detection device (14) is arranged between the roll stands (2, 3). 20. Process for tension control between the roll stands of roll trains for steel bars, wire or profiles, with control of the drive speeds of successive roll stands,
characterized,
that when profile bars are rolled between two successive stands, the profile of the bar is measured with profile measuring devices and the values of the respective flange widths detected by them are used in a computing device with predetermined fixed values compared to corrections of the speed setting values of the subsequent roll stands. 21. The method according to claim 20,
characterized,
that the values of the flange widths detected by the profile measuring devices are compared with values of flange widths which were recorded by the further profile measuring devices arranged upstream of the two roll stands. 23. The method according to claim 20,
marked by
the use of laser measuring devices or line cameras which measure the flange width of profiles. 24. The method according to claim 20,
characterized,
that when the measuring devices are arranged in a compact rolling group consisting of an input-side universal stand (UR), a compression stand (E) and an output-side universal stand (UF) between the input-side universal stand (UR) and the compression stand (E), a first measurement of the flange width (b ) of the profile strand (PS) entering the compact rolling group takes place before it has reached the exit-side universal stand (UF), and that this follows a second measurement when the exit-side universal stand (UF) has detected the profile strand (PS).

Images