DE10102037B4 - Method and device for controlling or regulating the rolling process of rolling stock - Google Patents

Abstract

Method for controlling or controlling the rolling process of rolling stock (1) in a single or multi-stand rolling train, one or more duo-, quarto- or sexto-scrapers (2) having supporting (3), intermediate (4) or work rolls (5 ) are used
in which at least two work rolls (5) cooperatively roll the rolled stock (1) to be processed and
in which at least one, preferably two, work rolls (5) are pivoted relative to the perpendicular (S) to the conveying direction (R) of the rolling stock (1) by a small pivoting angle (α) in the horizontal plane (H),
wherein means (6) are provided with which the swivel angle (α) can be adjusted,
characterized,
that the method comprises the steps:
a) measuring the axial force (F), the at least one of the rollers (3, 4, 5), preferably the work roll (5) on which this bearing housing exerts;
b) supplying the measured value of the axial force (F) to an evaluation device (7);
c) Comparison of the measured value (F) with ...

Description

The The invention relates to a method for controlling or regulating the Walzvorgangs of rolling in a single or multi-stand rolling mill, wherein a or several duo-, quarto- or sexto-frameworks with support, intermediate or work rolls be used, in which at least two work rolls cooperatively to roll the rolling stock to be machined and in which at least one, preferably two, Work rolls opposite the perpendicular to the conveying direction of the rolling stock by a small tilt angle in the horizontal plane be pivoted, wherein means are provided, with which the swivel angle can be adjusted.

Of Furthermore, the invention relates to a device for controlling or Control of the rolling process of rolling stock in a single or multi-stand rolling train.

The generic rolling process is known in the production of steel, ie in the area of steel rolling mills. When rolling a slab between two work rolls, it is occasionally observed that an undesirable waviness is formed on the rolling stock or that the rolling stock has insufficient dimensional stability, which is caused by the rolling process. It has been found that a quality improvement can be accomplished by the work rolls - and possibly also the support and intermediate rolls - are pivoted relative to the perpendicular to the conveying direction of the rolling stock by a slight pivot angle in the horizontal plane of the rolling stock. As a swivel angle, a value of less than 1 ° is usually sufficient. The prior art is referred to the company publication "Mitsubishi Pair Cross Mill" of Mitsubishi Heavy Industries, Ltd., Tokyo, Japan. In the method described there, the two work rolls, which contact the rolling stock, are each rotated by the said pivot angle relative to each other, so that the roll center lines form an "X" in plan view. This is on 2 the description referenced.

It has been found that with the generic method a noteworthy quality improvement can be achieved. However, when applying the method also a much stronger dimensioned storage of the rollers needed because by the pivoting between roller and rolling a force perpendicular to the conveying direction of the Walzguts is generated, which in the storage of the roller an axial force causes. This makes it necessary to roll bearings so too dimension that they can absorb significantly higher forces. This makes the storage systems more expensive for the rollers considerably.

Problematic is in particular that it is very difficult to reliable Predictions about the size of yourself to make the resulting axial force. As a result, the bearings either strongly oversized be, which costs disadvantageous or that the bearings are overstressed due to excessive forces, which leads to premature failure or the conversion parts overly strong wears.

From the DE 27 46 937 C2 It is known to provide a device for measuring forces in a rolling bearing, wherein at least two arranged at different locations of the bearing strain gauges are provided on the outer or inner ring of the bearing. With this known solution, it is possible to determine the axial force received by the bearing. This can be forwarded to the appropriate circuit where it is used for process control.

Of the Invention is based on the object, a method and an associated device for controlling or regulating the rolling process when using the generic method to propose with which it is possible is, both an oversizing to exclude the roll bearings as well as to ensure that the bearings and the conversion parts (eg latches) the required service life exhibit. So it's for that Care should be taken to ensure that the roller bearings are only up to the permissible Be operated load.

• a) Messen der Axialkraft, die zumindest eine der Walzen, vorzugsweise die Arbeitswalze, auf das diese lagernde Gehäuse ausübt;
• b) Zuleiten des gemessenen Wertes der Axialkraft an eine Auswerteeinrichtung;
• c) Vergleich des gemessenen Wertes mit einem gespeicherten vorgegebenen maximalen Wert;
• d) Auslösen eines Signals, sobald der gemessene Wert den gespeicherten vorgegebenen Wert übersteigt, wobei das Signal die Mittel zum Einstellen des Schwenkwinkels so beeinflusst, dass ein geringerer Schwenkwinkel eingestellt wird, der eine Axialkraft hervorruft, die unter dem vorgegebenen Wert liegt.

The solution of this object by the invention is characterized in that the method comprises the following steps:

• a) measuring the axial force, the at least one of the rollers, preferably the work roll on which this bearing housing exerts;
• b) supplying the measured value of the axial force to an evaluation device;
• c) comparing the measured value with a stored predetermined maximum value;
• d) triggering a signal as soon as the measured value exceeds the stored predetermined value, the signal influencing the means for adjusting the swivel angle so that a lower swivel angle is set, which produces an axial force which is below the predetermined value.

The proposal according to the invention thus provides that in a rolling mill stand, the axial force between the roller and the housing is determined, which must therefore be taken up by the bearing of the roll neck. The measured axial force value is constantly compared with a predetermined maximum value, and measures are taken as soon as the predetermined value is exceeded. It is further provided that the di rectification of the fault is rectified to the effect that in the closed loop a return of the swivel angle takes place. In particular, it is provided that the signal influences the means for adjusting the pivot angle so that a lower pivot angle is set, which causes an axial force which is below the predetermined value.

at huge It may be advantageous to measure the measured value of the axial force to transmit wirelessly preferably an inductive transmission or such can be envisaged by radio.

The device for controlling or regulating the rolling process of rolling stock has means with which one, preferably two, work rolls can be pivoted relative to the perpendicular to the conveying direction of the rolling stock by a small pivoting angle in the horizontal plane. The proposal according to the invention is characterized by
at least one sensor for measuring the axial force applied by the roller to the housing supporting it,
an evaluation unit for comparing the measured axial force with a predetermined maximum value and
Means for generating and / or outputting a signal as soon as the measured value exceeds the stored predetermined value, the means being suitable for setting a lower pivoting angle which produces an axial force which is below the predetermined value.

With the proposed measures it is ensured that an excessive increase of the axial force in the roll neck bearing due to an oversized swing angle not remains undetected, but immediately leads to the initiation of countermeasures. This can be achieved that overuse the bearing is excluded and consequently the life of the storage significantly increased becomes.

In the drawing is an embodiment of Invention shown. Show it:

1 schematically the cross section through a six-high stand of a rolling mill,

2 schematically the top view of the six-high scaffold, but only the two work rolls are shown.

In 1 is a sexto scaffold 2 to see in a rolling mill, in the rolling stock 1 is rolled. The rolling stock 1 is transported in the conveying direction R. The scaffolding 2 has a total of six rollers 3 . 4 . 5 on, on each other or on the rolling stock 1 roll. The work rolls 5 stand with the intermediate rollers 4 in connection; These act in turn with the support rollers 3 together.

2 shows the top view of the slab to be rolled 1 , where the two work rolls 5 are sketched. To improve quality, the two work rolls run 5 not parallel to each other, but are pivoted by a slight pivot angle α relative to the perpendicular S to the conveying direction R in the horizontal plane H. To set the pivot angle α serve means 6 , which are sketched here schematically as piston-cylinder units. By means of the adjustment means 6 the swing angle α can be changed. In general, it is sufficient to provide a swivel angle α smaller than 1 ° in order to produce the desired effect, namely the waviness of the rolling stock 1 reduce or the dimensional stability of the rolling stock 1 to improve. Not shown is that the intermediate or backup rollers 3 . 4 be rotated in accordance with the pivot angle α, so that the working, intermediate and support roller with respect to their axis of rotation are parallel to each other.

The setting of a pivot angle α not equal to zero has the consequence that the work roll 5 during rolling of the rolling stock 1 a lateral Abdrückkraft perpendicular to the conveying direction R undergoes. This axial force F must be absorbed by the roll neck bearing (not shown). In storage is a sensor 8th known manner, with which it is possible, the axial force between roller 5 and determine housing. The one from the sensor 8th Measured axial force value F is in the embodiment via a wireless signal transmission unit 11 to the evaluation device 7 directed. In the facility 7 the maximum value for the axial force F _{max is} stored. Therefore, a comparison between actual value F and maximum value F _{max can be} made in it. As long as the measured value F is smaller than the maximum value F _max , no action is required. If, however, the permissible value F _{max is} exceeded, the control or regulating device initiates 9 A measure. In the simplest case, for example, an acoustic signal generator 10 activates so that the operating personnel are made aware that too high axial force values are generated in the roll neck bearing. It can then be ensured that by reducing the pivot angle α, a reduction of the axial force, so that an overuse of storage or wear on the conversion parts omitted.

Preferably, however, by the control or regulating device 9 directly on the funds 6 for setting the swivel angle α are acted: If too large value for the current axial force F can about the means 6 a reduction of the swivel angle α be caused, so that in the sequence also reduces the axial force F. The setting of the swivel angle α can thus be carried out in a closed loop such that an exceeding of a maximum limit F _max for the axial force is omitted.

1

rolling

2

Scaffolding in one rolling train

3

supporting roll

4

intermediate roll

5

Stripper

6

medium for adjusting the swivel angle

7

evaluation

8th

sensor

9

Rule- or control device

10

acoustic signaler

11

wireless Signal transmission unit

α

swivel angle

S

vertical

R

conveying direction

H

WL

F

axial force

F _max

maximum axial force

Claims (5)

Method for controlling or regulating the rolling process of rolling stock ( 1 ) in a single or multi-stand rolling train, one or more duo-, quarto- or sexto-scrapers ( 2 ) with support ( 3 ), Between- ( 4 ) or work rolls ( 5 ) are used, in which at least two work rolls ( 5 ) cooperatively the rolling stock to be processed ( 1 ) and in which at least one, preferably two, work rolls ( 5 ) relative to the vertical (S) to the conveying direction (R) of the rolling stock ( 1 ) are pivoted by a small pivot angle (α) in the horizontal plane (H), wherein means ( 6 ), with which the swivel angle (α) can be set, characterized in that the method comprises the steps of: a) measuring the axial force (F), the at least one of the rollers ( 3 . 4 . 5 ), preferably the work roll ( 5 ) on which this bearing housing exerts; b) supplying the measured value of the axial force (F) to an evaluation device ( 7 ); c) comparing the measured value (F) with a stored predetermined maximum value (F _max ); d) triggering a signal as soon as the measured value (F) exceeds the stored predetermined value (F _max ), the signal being the means ( 6 ) is adjusted to adjust the swivel angle (α) so as to set a lesser swivel angle (α) which causes an axial force (F) lower than the predetermined value (F _max ). Method according to claim 1, characterized in that the measured value (F) is transmitted wirelessly. Method according to claim 2, characterized in that that wireless transmission done by induction. Method according to claim 2, characterized in that that wireless transmission by radio. Device for controlling or regulating the rolling process of rolling stock ( 1 ) in a single or multi-stand rolling train, one or more duo-, quarto- or sexto-scrapers ( 2 ) with support ( 3 ), Between- ( 4 ) or work rolls ( 5 ), the funds ( 6 ), with which one, preferably two, work rolls ( 5 ) relative to the vertical (S) to the conveying direction (R) of the rolling stock ( 1 ) can be pivoted about a small pivoting angle (α) in the horizontal plane (H), characterized by at least one sensor ( 8th ) for measuring the roll ( 3 . 4 . 5 ) on which this bearing housing applied axial force (F), an evaluation unit ( 7 ) for comparing the measured axial force (F) with a predetermined maximum value (F _max ) and mean ( 9 . 10 ) for generating and / or outputting a signal as soon as the measured value (F) exceeds the stored predetermined value (F _max ), the means ( 9 . 10 ) are suitable for setting a smaller swivel angle (α), which causes an axial force (F) which is below the predetermined value (F _max ).