DE102006018748A1 - Bending driver and method for bending a strand - Google Patents

Abstract

In a bending driver (1) for bending a solidified strand (2), in particular steel strand, below a strand guide (6) of a vertical casting installation, comprising a first pair of rollers (17) for conveying the strand (2) out of the strand guide (6), a bending device (3) for bending the strand conveyed by the first pair of rollers (17), so that a turning point / tangent point (7) is established at the level of the first pair of rollers (17) for the strand (2), the bending device (3) is as one second pair of rollers (18), with a bending roller (16) and a counter roller (19), of which at least one roller is driven. The two rollers (16, 19) are each frictionally engaged on opposite surfaces of the strand and are not only used for bending, but also for the additional conveying out of the strand.

Description

The The invention relates to a bending driver and a method for turning a solidified strand, especially steel strand, below a strand guide a vertical caster, comprising a first driven pair of rollers for conveying the Stranges from the strand leadership, one Turning device with a turning roller for turning of the first pair of rollers ausgeförderten Stranges, so that up of the first pair of rolls for sets the strand a turn point / tangent point.

at known vertical installations, in particular CSP installations, is the solidified strand below the strand guide in Bending driver bent and directed in the straightening driver. Such systems are, for example, from the company's technical report Continuous Casting and rolling; First CSP plans for stainless steel at SAT, Italy, authors: G. Brascugli, A. Mascanzoni, F. Quix and K. Schwellenbach known by acciai speciali terni and SMS Demag.

Out DE 196 37 545 A1 is known in a device for redirecting a cast in a continuous casting thin slab strand from the vertical casting direction in a horizontal Ausförderrichtung the thin slab strand is conveyed by rollers and bent and then straightened by straightening rollers. To achieve a simpler, more cost-effective design of a continuous casting with lesser height several re bending rollers are successively arranged following pairs of drive rollers, whose position corresponds to a multi-stage reduction of the bending radius of the thin slab strand.

A driving and bending device of a continuous casting is in DE 1 289 955 described. The device has at least one pair of drive rollers, a downstream bending roller and acting as Gegenhalterolle role, the bearings of at least one pair of drive rollers during the casting operation transverse to the strand and roller axis are movable together.

in the Bending drivers are because of the required extract / conveyance and Abbiegekräfte arranged at least two driven pairs of rollers. A support of a Stranges with liquid Swamp is in the bending driver because of the large role division of example 700 mm to 1000 mm not possible.

Of the Invention is based on the object, an improved bending driver and an improved method for bending a solidified strand specify the vertical machine height at the same metallurgical Support length can be shortened can or for an increase the production output (casting speed, Casting thickness) same vertical machine height the metallurgical support length by at least the roll pitch of the bending driver can be increased. It has to be both the retraction of the rigid cold strand, the separation of the cold strand from the hot strand, the overbending of the strand at the first turn, the continuous turn of strand and expelling of the hot strand possible be.

These Task is inventively characterized solved, that in a bending driver according to the preamble of claim 1, the turning device as a second pair of rollers is formed, which in addition to the turning roller additionally a Counter roll has, and that the turning roller and / or the counter roll is driven and both rollers each frictionally engaged in Reference to opposite Surfaces the strand are arranged to the strand in addition to the first pair of rollers feeding out.

From the two pairs of rollers in the bending driver is that in the prior art provided pair of rolls above the turn-off point (tangent point) replaced by a pair of rollers below the turn-off point in the pouring arc. This will cause the height of the bending driver around the height of the roller pair is reduced above the turn-off point / tangent point.

Around the one to carry out of the strand required power are two drive levels necessary in the form of a first pair of rollers at the tangent point and a second, arranged below the first pair of rollers, roller pair, the consists of a turning roller and a counter-roller, of which at least one is powered. The second pair of rollers according to the invention has a double function: on the one hand it serves for turning and on the other hand - in addition to the first pair of rollers - also to carry out of the strand from the strand guide.

In order to the respective driven turning roller and / or counter-roller the Ausförderungskraft effectively transfers to the strand, the Turning roller and the counter-roller with respect to the strand so hired be that they have a normal force to transmit the drive torque to exercise on the strand, so that a frictional engagement between the turning roller and the strand and between the strand and the counter-roll. The frictional connection allows advantageously a secure transmission that of the respective driven turning roller and / or counter-roller Applied Ausförderkraft on the strand.

For the roller adjustment on the fixed and the lot side, the Zy Linder- / Lagermitten arranged outside the two base frame. To retract the cold strand, the turning roller moves to Passline. The driving in and out is done with the cold runner driver and the bending roller pair at the turn-off point.

The Separating the cold strand from the hot strand, overstretching the strand and The continuous turning is done as before with the turning roller. The counter-roll is driving no later than in the continuous bending position against the strand to the Ausförderung of the strand. For large required pull-out forces is the opposite role already in the separation of the cold strand from the hot strand hired against the rope.

Further Embodiments of the device will be apparent from the relevant Dependent claims.

at a method according to the invention for Turning a solidified strand below the strand guide a Senkrechtgießanlage in a bending driver, will be below the turn point / tangent point a pair of rollers, consisting of a turning roller and a counter-roller, hired against the rope.

Further Embodiments of the method result from the relevant Dependent claims.

embodiments The invention will be described in more detail with reference to two very schematic drawings.

1 in side view a bending device according to the prior art, and

2 in side view a bending device according to the invention.

In 1 is a bending driver 1 for bending a strand 2 shown. The bending driver 1 According to the prior art consists of two pairs of rollers 4 . 5 and a strand guide arranged above it 6 , The solidified strand 2 becomes at the tangent point 7 from a turn-down device 3 , a non-propelled turning roller 8th , in the pouring radius 9 bent. The pair of roles 4 is above the tangent point 7 arranged. Below the turning wheel 8th is a powered pair of rollers 10 provided for raising or lowering a cold strand. On every role level 11 . 12 . 13 . 14 is a role about cylinders 15 against the strand 2 unemployable.

The 2 shows a bending driver 1 and a strand guide arranged above it 6 according to the invention. The solidified strand 2 becomes at the tangent point 7 from a turntable 16 in the casting radius 9 bent. The bending driver 1 consists of a driven pair of rollers 17 at the tangent point 7 and a pair of roles 18 that below the tangent point 7 is arranged. The arrangement corresponds approximately to the position of the turning roller 8th in the prior art 1 , The pair of roles 18 consists of the turning roller 16 and a counter-roll 19 ,

Here is the axis of rotation 20 the turntable 16 about the height difference 22 from the axis of rotation 21 the counter role 19 spaced, wherein the axis of rotation 21 above the axis of rotation 20 is arranged.

From the role pair 18 , consisting of turning roller 16 and counter role 19 , at least one role is driven.

Both the turning role 16 as well as the counter role 19 be by means of cylinder 23 . 24 separately to the fixed side 25 or lot page 26 of the strand 2 hired.

All roles or pairs of roles 10 . 16 . 17 . 18 . 19 will be in stock 27 held and in guideways 28 . 29 . 30 guided. The arrangement of these device parts takes place in a base frame 31 ,

1

bending driver

2

strand

3

Abbiegeeinrichtung

4

roller pair

5

roller pair

6

strand guide

7

roller pair

8th

fixed side

9

casting radius

10

Abbiegerolle

11

role level

12

role level

13

role level

14

role level

15

cylinder

16

Abbiegerolle

17

roller pair

18

roller pair

19

counter-roller

20

axis of rotation Abbiegerolle

21

axis of rotation counter-roller

22

height difference

23

cylinder

24

cylinder

25

fixed side

26

loose side

27

camp

28

guideway

29

guideway

30

guideway

31

base frame

32

cylinder

33

cylinder

Claims (11)

Bending driver ( 1 ) for bending a solidified strand ( 2 ), in particular steel strands, below a strand guide ( 6 ) of a vertical caster, comprising: a first driven roller pair ( 17 ) for conveying out the strand ( 2 ) from the strand guide ( 6 ), a turning device ( 3 ) with a turning roller ( 16 ) for turning off the first pair of rollers ( 17 ) conveyed strand, so that at the height of the first pair of rollers ( 17 ) for the strand ( 2 ) a turn-off point / tangent point ( 7 ), characterized in that the turning device ( 3 ) as a second pair of rolls ( 18 ) is formed, which next to the turning roller ( 16 ) additionally a counter-roll ( 19 ), and that the turning roller and / or the counter-roller is driven and both rollers are each frictionally arranged with respect to the opposite surfaces of the strand, in order to deliver the strand in addition to the first pair of rollers. Bending driver according to claim 1, characterized in that the axis of rotation ( 21 ) of the counter-roll ( 19 ) is higher than the axis of rotation ( 20 ) of the turning roller ( 16 ) Bending driver according to claim 1 or 2, characterized in that the height difference ( 22 ) of the rotary axes ( 20 . 21 ) is greater than 30 mm and less than 120 mm. Bending driver according to claim 2 or 3, characterized in that the height difference ( 22 ) of the rotary axes ( 20 . 21 ) for the continuous turn position preferably according to the formula ΔH = H - (R-Dm-Dr / 2) × H / (R + Dr / 2) where ΔH: distance of the axes of rotation in mm H: distance of the point of turn / tangent point to the axis of rotation of the turning roller in mm R: casting radius in mm Dm: mean strand thickness in mm Dr: roll diameter in mm Bending driver according to claim 1, characterized in that the guideway ( 29 ) the storage ( 27 ) of the turning roller ( 16 ) and the counter-roll ( 19 ) outside the guideway ( 28 ) the storage ( 27 ) of the pair of rolls ( 17 ) at the turn point / tangent point ( 7 ) lies. Bending driver according to one of claims 1 to 5, characterized in that the cylinders ( 32 . 33 ) outside the basic framework ( 31 ) in the middle of the guideways ( 28 . 30 ) are arranged. Bending driver according to one of claims 1 to 6, characterized in that the contact force of the turning roller ( 16 ) for a bending strength of the strand ( 2 ) by Max. 350 N / mm ² plus the contact force of the counter-roller ( 19 ). Method for bending a solidified strand ( 2 ) below a strand guide ( 6 ) of a vertical caster in a bending driver ( 1 ), characterized in that below the turn-off point / tangent point ( 7 ) a pair of rolls ( 18 ) consisting of a turning roller ( 16 ) and a counter-roll ( 19 ), against the strand ( 2 ) is hired. A method according to claim 8, characterized in that the contact force of the counter-roller ( 19 ) is designed depending on the required drive power. A method according to claim 8 or 9, characterized in that when separating the cold strand from the hot strand, the immediately subsequent turning with short-time over bending of the hot strand and the return to the continuous bending position, the speed of the turning roll ( 16 ) and the counter-roll ( 19 ), when putting the rollers on the strand ( 2 ), depending on the casting speed, distance to the turn point / tangent point and the horizontal roll position (strand position) is controlled. A method according to claim 8, 9 or 10, characterized in that in the continuous bending position, the rotational speed of the counter-roller ( 19 ) in the ratio of the radial difference is less than the rotational speed of the turning roller ( 16 ).