EP2017018B1 - Method for producing wire and wire rolling mill - Google Patents

Abstract

The method involves passing a rolled wire (1) through a cooling and/or adjusting section (4) behind a finishing stand (2) in a conveying direction (F). The wire is pulled by a driver (5) through the cooling and/or adjusting section. A winding head (6) is arranged behind the driver in the conveying direction, where the wire is stored as windings using the winding head. Another driver (7) is operated such that the wire between the drivers form a loop (8) with a loop height (H), which is measured from a straight target line (9). An independent claim is also included for a wire rolling mill with a finishing stand for rolling a wire.

Description

The invention relates to a method for producing wire, in which the wire is rolled in at least one finishing stand of a wire rolling mill, wherein the rolled wire passes behind the final finishing stand in the conveying direction a cooling and / or compensation path, wherein the wire by a at the end of Cooling and / or balancing path arranged first driver is pulled through the cooling and / or balancing section and wherein in the conveying direction behind the first driver a a Windungsleger for the wire, with which it can be stored in turns, upstream second driver is arranged. Furthermore, the invention relates to a wire rolling mill for carrying out the method. Such a method and wire rolling mill are by the DE 3601 753 A1 known.

In wire rolling, in a final rolling process, the wire is rolled in a finishing block from a number of finishing stands and brought to the final desired wire diameter. The wire then passes through a cooling and equalizing section before being laid in turns by means of a layer.

Other solutions according to the prior art are for two possible embodiments in the Figures 1 and 2 shown. Shown is a part of a wire rolling mill 3, of which in particular a finished block with a number finishing stands 2 can be seen. The wire 1 is finally rolled in the finishing stands 2. He leaves the finished block in the conveying direction F at a speed v _D. Behind the finished block, the wire 1 enters a cooling and equalizing section 4. According to Fig. 1 behind the cooling and balancing section 4, a driver 5 is arranged, which pulls the wire 1 through the cooling and balancing section 4. Immediately behind the driver 5 a Windungsleger 6 is arranged, which deposits the wire 1 in a known manner in turns.

The solution according to Fig. 2 differs from the one after Fig. 1 essentially only in that a further driver 5 is arranged here within the cooling and equalizing section 4, which keeps the wire 1 under tension as it passes the cooling and equalizing section 4.

It is shown in both figures that due to the design of the system, the wire 1 in the area of the driver 5 and the turntable 6 has the speed v _D , with the wire 1 leaves the finished block.

The wire 1 thus leaves the finished block or its finishing stands 2 at the speed v _D , which, however, is not absolutely constant. Rather, the velocity v _D fluctuates around an average value. This variation in speed results in that the shed shape of the wire is not optimal, that is, the winding diameter of the wire 1 laid down by the layer is not constant, since the layer rotates at a constant speed, but the wire has a non-constant speed when entering the layer.

The invention is therefore based on the object to provide a method and an associated wire rolling mill, with which it is possible to achieve an improved shingling of the laid wire from the layer, in particular to deposit the wire with a very constant winding diameter.

The solution of this problem by the invention according to the method is characterized in that the arranged before the Windungsleger second driver is operated so that the wire between the two drivers forms a loop with a measured from the straight nominal line loop height.

The drive of the second driver can be controlled so that the loop height is within a predetermined range of values.

Preferably, the drive speed of the Windungslegers is further controlled or regulated in dependence on the conveying speed of the second driver.

The wire is held in the cooling and / or compensation path between the last finishing stand and the first driver of this preferably under a predetermined train. Furthermore, it can be provided that within the cooling and / or compensation path, a further driver is arranged, which exerts a tensile force on the wire.

The proposed wire rolling mill is characterized according to the invention in that the second driver arranged in front of the layer is drivable so that the wire between the two drivers forms a loop with a loop height measured from the straight nominal line.

In this case, to control the size of the loop preferably measuring means for detecting the loop height of the loop are provided. Furthermore, control means are advantageously present which are connected to the measuring means and can influence a drive motor for the second driver.

The control means may also influence a drive motor of the layer, so that in this way a synchronization of the operating speed of the second driver and the Windungslegers can be made.

With the proposal according to the invention it is achieved that it can be ensured with relatively simple means that the wire can be stored by the layer with a constant diameter. Variations in the wire speed, which are present behind the finished block, can be compensated in a simple manner.

The rolling process is thus decoupled from the laying process.

Advantageously, there are better wire coils, fewer problems with deviations in the diameter of the turns and less downtime of the system.

Fig. 1

schematisch einen Ausschnitt aus einem Drahtwalzwerk mit einem Fer- tigblock, einer Kühl- und Ausgleichsstrecke, einem Treiber und einem Windungsleger gemäß dem Stand der Technik;

Fig. 2

eine zu Fig. 1 alternative Ausgestaltung eines Drahtwalzwerks gemäß dem Stand der Technik;

Fig. 3

in der Darstellung nach den Figuren 1 und 2 einen Ausschnitt aus ei- nem Drahtwalzwerk gemäß einer Ausgestaltung der Erfindung; und

Fig. 4

eine vergrößerte Darstellung einer Einzelheit von Fig. 3, wobei der Be- reich zwischen zwei Treibern dargestellt ist.

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

Fig. 1

schematically a section of a wire rolling mill with a finished block, a cooling and balancing section, a driver and a Windungsleger according to the prior art;

Fig. 2

one too Fig. 1 alternative embodiment of a wire rolling mill according to the prior art;

Fig. 3

in the illustration after the Figures 1 and 2 a section of a wire rolling mill according to an embodiment of the invention; and

Fig. 4

an enlarged view of a detail of Fig. 3 , where the area between two drivers is shown.

In Fig. 3 is a section of a wire rolling mill 3 to see, which is constructed analogously to the solution described above according to the prior art (s. Fig. 1 and 2 ). The wire 1 leaves in the conveying direction F the finishing stands 2 of a finished block in order to reach a cooling and equalizing section 4. The wire 1 is pulled by the cooling and equalizing section 4 by means of a first driver 5; the driver 5 holds the wire 1 when passing the cooling and balancing section 4 under train. The driving speed of the first driver 5 is determined by the wire speed V _{D of} the wire 1 behind the finished block. There, the wire 1 has the velocity V _D , which is not constant, but fluctuates around an average value. Behind the cooling and equalizing section 4 of the wire 1 enters a Windungsleger 6, which deposits it in a known manner in turns, z. B. on a conveyor belt.

It is essential that in the conveying direction F behind the first driver 5 and before the Windungsleger 6, a second driver 7 is arranged. The two drivers 5 and 7 are spaced apart. The second driver 7 is selectively operated so that the wire 1 between the two drivers 5 and 7 forms a loop 8. As in Fig. 3 can be seen, the loop 8 has a loop height H, which is measured from the straight line or ideal line 9 from.

The second driver 7 conveys the wire 1 at a speed V _T , which is kept substantially constant and on account of which the winding diameter of the wire results when it is laid down by the layer 6. Namely, the second driver 7 is operated at a constant speed V _T , wherein the drive speed of the coil former 6 is coupled to the drive speed of the second driver 7.

Variations in the speed V _D can be compensated in this way by means of the sling 8, and the supply of the wire 1 in the layers 6 takes place by means of the second driver 7 at a constant speed V _T. This leads to an optimal shed image, since the winding diameter is constant.

Details are in Fig. 4 shown. As shown, in order to be able to compensate for speed variations in the wire speed at the outlet from the finished block, the wire 1 is not guided linearly along the reference line 9 between the two drivers 5 and 7, but curved, so that the loop 8 is formed. At the apex, the loop 8 has a loop height H, which may move between a predeterminable minimum value H _min and a maximum value H _max . The respective courses of the wire 1 are shown with dashed lines.

The current value of the loop height H is determined by means of a measuring means 10, in which it is z. B. can act to a light barrier, which can measure the maximum deflection of the wire 1 from the target line 9. The value determined by the measuring means 10 for the loop height H is fed to a control means 11.

The control means 11 drive a drive motor 12 for the second driver 7 so that the loop height H is within the allowable range. If the value of the loop height becomes too large, the drive motor 12 is caused to rotate faster, and if the value becomes too small, the drive motor 12 becomes slower. The loop height H is thus kept in the closed loop at a desired value.

As in Fig. 4 is indicated only schematically, the control means 11 can also take corresponding effect on the drive of the Windungslegers 6, so that the operating speeds of the second driver 7 and that of the Windungslegers 6 are synchronized. The result is laid turns with uniform winding diameter.

LIST OF REFERENCE NUMBERS

1

wire

2

finishing stand

3

Wire rod mill

4

Cooling and / or balancing section

5

first driver

6

laying head

7

second driver

8th

loop

9

target line

10

measuring Equipment

11

control means

12

drive motor

F

conveying direction

H

loop height

H _min

minimum loop height

H _max

maximum loop height

V _D

Speed of the wire behind the finishing stand

V _T

Speed of the wire behind the second driver

Claims (10)

1. A method for producing wire (1), in which the wire (1) is rolled in at least one finishing stand (2) of a wire rod mill (3), wherein the rolled wire (1) passes through a cooling and/or soaking section (4) downstream of the last finishing stand (2) referred to the conveying direction (F), wherein the wire (1) is pulled through the cooling and/or soaking section (4) by a first driver (5) that is arranged at the end of the cooling and/or soaking section (4), and wherein a second driver (7) is arranged downstream of the first driver (5) referred to the conveying direction (F) and upstream of a coil laying head (6) for the wire (1), by means of which it can be laid down in the form of coils,
   characterized in
   that the second driver (7) arranged upstream of the coil laying head (6) is operated in such a way that the wire (1) forms a loop (8) with a loop height (H) measured from the straight reference line (9) between the two drivers (5, 7).
2. The method according to Claim 1,
   characterized in
   that the drive of the second driver (7) is controlled in such a way that the loop height (H) lies within a predefined range (H_min, H_max).
3. The method according to Claim 1 or 2,
   characterized in
   that the driving speed of the coil laying head (6) is controlled or regulated in dependence on the conveying speed (v_T) of the second driver (7).
4. The method according to one of Claims 1 to 3,
   characterized in
   that the wire (1) is held under predefined tension by the first driver in the cooling and/or soaking section (4) between the last finishing stand (2) and the first driver (5).
5. The method according to one of Claims 1 to 4,
   characterized in
   that another driver (5) is arranged within the cooling and/or soaking section (4) and exerts a tensile force upon the wire (1).
6. A wire rod mill (3) with at least one finishing stand (2) for rolling the wire (1), wherein a cooling and/or soaking section (4) for the wire (1) is arranged downstream of the last finishing stand (2) referred to the conveying direction (F), wherein a first driver (5) is arranged at the end of the cooling and/or soaking section (4) and can pull the wire (1) through the cooling and/or soaking section (3), and wherein a second driver is arranged downstream of the first driver (5) referred to the conveying direction (F) and upstream of a coil laying head (6) for the wire (1), particularly for carrying out the method according to one of Claims 1 to 5,
   characterized in
   that the second driver (7) arranged upstream of the coil laying head (6) can be driven in such a way that the wire (1) forms a loop (8) with a loop height (H) measured from the straight reference line (9) between the two drivers (5, 7).
7. The wire rod mill according to Claim 6,
   characterized by
   measuring means (10) for measuring the loop height (H) of the loop (8).
8. The wire rod mill according to Claim 7,
   characterized by
   control means (11) that are connected to the measuring means (10) and assigned to a driving motor (12) for the second driver (7).
9. The wire rod mill according to Claim 8,
   characterized in
   that the control means (11) are assigned to a driving motor of the coil laying head (6).
10. The wire rod mill according to one of Claims 6 to 9,
    characterized in
    that another driver (5) is arranged within the cooling and/or soaking section (4).

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