DE10321553A1 - Method and device for oscillating a continuous casting mold and for guiding a casting strand when casting liquid metals, in particular liquid steel materials - Google Patents

Abstract

A method and a device for oscillating a continuous casting mold (1) and for guiding the casting strand (2) in a support roller stand (5) when casting liquid metals, in particular liquid steel materials, with a continuous casting mold (1) supported on a lifting table (3) In terms of process engineering, it can cover a wide range of motion processes, various types of continuous casting plant and a large number of format thicknesses (13) by using oscillation drives (7; 8) arranged one behind the other in the casting direction (6) in one and the same continuous casting device for vertical casting both oscillation drives (7; 8) for the same oscillation movements (7a; 8a) with the same strokes and, on the other hand, for an arcuate casting for unequal oscillation movements (7b; 8b) with the same strokes, the front oscillation drive (8) in the casting direction (6) being controlled over shorter strokes r the rear oscillation drive (7) is controlled.

Description

The The invention relates to a method for oscillating a continuous casting mold and to lead of a casting strand when pouring of liquid Metals, especially liquid ones Steel materials in which the continuous casting mold with its weight supported on a lifting table and the lifting table in one guide the casting strand oscillates and moves in its guideway transported in a support roller frame becomes.

Such oscillation processes and associated support roller stands are known ( DE 198 17 7012 C2 ). The continuous casting mold, which oscillates in the casting direction and is held in a lifting table, executes any speed curve, such as an asymmetrical sine curve. The purpose of this method and the device are aimed at the lubrication between the mold wall and the strand skin formed. Special effects are achieved, for example, with a negative strip time. Their effects are an improved oscillation mark formation with a smaller oscillation mark depth. Another effect is the improved temperature stability of the strand skin over the full width of the continuous casting mold. This method is carried out on the basis of mechanical or hydraulic oscillation drives, settings of the strokes, the sinusoids, their modification and the like. Like. Can be carried out relatively easily within a regulating and control device with electrical-mechanical and / or electrical means alone.

The known devices see parallel to the direction of casting on the casting strand sides arranged means for guiding of the lifting table and hydraulic next to the casting line Piston-cylinder units as an oscillation drive. The means to lead consist for example of packages of leaf springs, which at the same time as Resonance springs work and the supply of drive energy in the reduce the vibrating system in operation. So far the well-known swing system successful in practice for Oscillation devices for casting billets, blocks, blooms, billets, slabs and thin slab casting molds applied Service.

Various Rod guide designs, which are preceded by the mold oscillation movements the for the oscillation suitable means for guiding the lifting table in the casting direction.

The continuous casting differ from those for execution of the casting process following strand guides (Support roller stands) in vertical, Vertical cornering and arches (e.g. circular arches). The mold oscillation must for every execution the strand guide and the strand dimensions are adjusted.

The The invention has for its object an oscillation method and an associated one To propose establishment through standardization of funds procedurally covers a wide range of motion sequences, to the various types of continuous casting plants and to a large number of formats of the casting strand can be applied.

The The object is achieved according to the invention in that at in the casting direction independent, individually controllable and adjustable oscillation drives in one and the same continuous casting device with adjustable or at least partially interchangeable if necessary Roller segments of the support roller frame on the one hand for vertical to water both oscillation drives for same oscillation movements with the same strokes and on the other hand for an arcuate casting for unequal ones Oscillating movements with unequal strokes electrically and / or hydraulically can be controlled, the front oscillating drive in the casting direction over shorter strokes compared to the rear oscillation drive is controlled. The advantages are variable setting of the oscillation curve from an infinite Radius (vertical or vertical turning system) to smaller ones Radii (arc system) such as a circular arc system within a continuous caster. At the same time, the desired Strand format (strand thickness) can be changed later if necessary. Can on the lift table interchangeable continuous casting molds for different Formats can be assembled, creating a standardized continuous caster arises. Corresponding assemblies of the support roller stand are adjusted or replaced.

A Design provides that on the basis of variable, shorter strokes of the front oscillation drive the oscillation curve and / or the Format thickness when casting of casting strands of different thicknesses become. As a result, the desired standardization also occurs a, with a uniform vibration system a large number of the movements and the strand dimensions.

The device is based on a prior art for the oscillation of a continuous casting mold and for guiding the casting strand when casting liquid metals, in particular when casting liquid steel materials, with a continuous casting mold mounted on a lifting table and at least least two independent hydraulic oscillation drives, which act on the lifting table, as well as with regulating and control devices for the lifting heights and oscillating movements of the oscillating drives.

The In terms of device technology, the object is thereby achieved solved, that in the middle, neutral plane or symmetrical to the middle Level of the pouring vein in the casting direction at least two oscillation drives are arranged one behind the other, being a first oscillation drive behind the lift table and a second oscillation drive is arranged in front of the lifting table. Thereby become vertical and arcuate Oscillating movements in a continuous caster as well as different ones Bows and different thicknesses of the casting strand allows.

A Changeover to changed Gießstrangabmessungen can be done, for example, by the fact that the front oscillation drive dependent on the arched Oscillation movement and / or the format thickness of the casting strand on changed Strokes adjustable is.

ever depending on the dimensions and the type of strand format, it is advantageous if the strokes of the rear oscillation drive and / or the front oscillation drive independently can be changed by the set oscillation frequency.

The predominantly Hydraulically acting oscillation drives can have other features are advantageously controlled in that the regulating and control devices a hydraulic circuit for the rear Oscillationsan and a substantially the same hydraulic circuit for have the front oscillation drive.

The Control means are also organized in such a way that the hydraulic circuit of the regulating or control device for the rear oscillation drive and the fixed side of the support roller frame and the hydraulic circuit of the regulating or control device for the front oscillation drive and the loose side of the support roller frame separated are provided.

To Further features suggest that the piston-cylinder units the fixed side and the loose side of the support roller frame each over a Solenoid valve are connected to a separate pressure source.

to Operation is provided according to another embodiment, that a hydraulic pressure accumulator each on the piston-cylinder units is connected to compensate for pressure fluctuations.

The Circuit is also for hydraulic, electrical or electronic measuring equipment executed in such a way that in the area of piston-cylinder units electronics modules located using compressed air via a connected compressed air line are cooled.

In the drawing are exemplary embodiments of the Invention shown, which are explained in more detail below.

It demonstrate:

1 a vertical section through a continuous casting mold with a casting strand and support roller frame and the two oscillation drives for a parallel oscillation movement,

2 the same vertical cut as 1 for arcuate oscillation movements,

3 the embodiment of the 2 as a scheme for the oscillation system of the continuous casting mold,

4 the application of the oscillation system to different format thicknesses,

5 a hydraulic circuit diagram for the rear and front oscillation drive,

6 an enlarged left half 5 for the rear oscillation drive arranged on the fixed side of the support roller stand and

7 an enlarged right half 5 for the front oscillation drive arranged on the loose side of the support roller frame.

In a continuous casting mold 1 A casting strand is used for billet, block, bloom, slab or thin slab formats 2 cast from liquid metal, in particular from liquid steel material, and oscillates for detachment by means of lubricants (casting powder) introduced on the format surfaces. The continuous casting mold 1 is with her weight on a lifting table 3 supported and the lifting table 3 will be in a tour 4 (e.g. from leaf springs, rollers with support surfaces and the like) moved oscillating, the guide 4 mold oscillation by means of a support roller frame adjusted to the shrinking format by cooling 5 is continued.

The leadership 4 in the casting direction 6 is an oscillatory movement 7a . 8a (represented by arrows) of consecutive, independent, individually controllable and controllable oscillation drives 7 and 8th inside the continuous caster assigned, the required adjustable or at least partially interchangeable roller segments 9 of the respective support roller frame 5 having.

The same continuous caster is used for vertical casting ( 1 ) equipped with two vertical, parallel and synchronous oscillation drives.

For an arcuate casting ( 2 ) become uneven oscillatory movements 7b . 8b controlled differently with unequal strokes electrically and / or hydraulically according to the desired arch shape.

The oscillation drives 7 . 8th are basically in the casting direction 6 as a rear oscillation drive 7 and as a front oscillation drive 8th arranged. The arcuate pouring direction 6 conditioned that the strokes of the front oscillation drive 8th are shorter than the strokes of the rear oscillation drive 7 ,

In 3 is the oscillation system of the continuous casting mold 1 with articulated oscillation drives 7 and 8th shown. The oscillation takes place around a plant center 10 instead, the continuous casting mold 1 the corresponding radius 11 or 12 and thus the format thickness 13 results. The oscillation curve 14 is therefore a circular arc with an average radius between the radii 11 and 12 , In the support roller frame 5 forms the format thickness 13 the continuation of the pouring vein between the pairs of support rollers 13a ,

4 shows the adjustment of the radii 11 and 12 depending on the different format thicknesses 13 , The individual format thicknesses 13 (formats 1 . 2 . 3 ) correspond to the middle levels 15 with the radii R1, R2 and R3, the oscillation drives 7 . 8th are individually in the middle plane lying on the middle radius 15 or alternatively for very heavy lifting tables with heavy continuous casting molds, in pairs symmetrical to the middle level 15 arranged. The respective middle levels 15 at the beginning of the plane of the radii R1, R2, R3 run vertically in space.

Each of the oscillation drives 7 . 8th is in the oscillatory movements 7b . 8b adjustable in different parameters. So is the front oscillation drive 8th depending on the arcuate oscillation movement and / or the format thickness 13 on the one hand, adjustable to changed strokes. On the other hand, the strokes of the rear oscillation drive 7 and / or the front oscillation drive 8th can be changed independently in the form of the oscillating movement and the set oscillation frequency.

In the 5 to 7 is to the regulation and control facilities 16 a hydraulic circuit 17 shown. In the embodiment is for the rear oscillation drive 7 and for the front oscillation drive 8th the same hydraulic circuit 17 selected. Here is the rear oscillation drive 7 the fixed page 18 and the front oscillation drive 8th the loss side 19 of the support roller frame 5 assigned.

The oscillation drives 7 . 8th consist of piston-cylinder units 20 same design. These piston-cylinder units 20 be on the hard page 18 and on the loss side 19 of the support roller frame 5 each via an electromagnetic valve 21 (Directional control valve) to a pressure source 22 connected. To the piston-cylinder units 20 are measuring sensors located there (such as position sensors, pressure sensors and the like) and electronic circuits cooled by compressed air. The compressed air is through a compressed air pipe 23 fed, which is laid together with the hydraulic lines, and to the two circuits 17 is branched off.

According to 6 becomes compressed air both at the piston end 24 as well as to the piston rod end 25 led where the electronic assemblies are located. The hydraulic pressure fluid flows through a tank line 26 to. Via a leakage line 27 leakage fluid flows back into the tank.

According to the 6 and 7 are on the piston-cylinder units 20 into the tank line 26 one hydraulic pressure accumulator each 28 connected to compensate for pressure fluctuations.

Inside a dash-dotted housing 29 there are all measuring elements that are directly assigned to the piston-cylinder unit.

1

continuous casting

2

cast strand

3

Lift table

4

guide

5

Supporting roll framework

6

casting

7

rear oscillatory

7a

just oscillatory

7b

arcuate oscillatory motion

8th

front oscillatory

8a

just oscillatory

8b

arcuate oscillatory motion

9

roller segment

10

Conditioning center

11

radius

12

radius

13

size thickness

13a

casting strand

14

oscillation curve

15

middle (neutral) level

16

Rule- and control devices

17

hydraulic circuit

18

fixed side

19

loose side

20

Piston-cylinder unit

21

Solenoid valve

22

pressure source

23

Pneumatic tubes

24

piston side The End

25

piston rod-sided The End

26

tank line

27

Leakage line

28

hydraulic accumulator

29

casing

Claims (10)

Process for oscillating a continuous casting mold ( 1 ) and for guiding a casting strand ( 2 ) when casting liquid metals, in particular liquid steel materials, in which the continuous casting mold ( 1 ) with their weight on a lifting table ( 3 ) supported and the lifting table ( 3 ) in a guided tour ( 4 ) oscillating and in the guideway of the casting strand ( 2 ) in a support roller frame ( 5 ) is transported, characterized in that when in the casting direction ( 6 ) independent, individually controllable and adjustable oscillation drives arranged one behind the other ( 7 ; 8th ) in one and the same continuous casting device with, if necessary, adjustable or at least partially interchangeable roller segments ( 9 ) of the support roller frame ( 5 ) on the one hand for vertical casting both oscillation drives ( 7 ; 8th ) for the same oscillation movements ( 7a ; 8a ) with the same strokes and on the other hand for an arcuate casting for uneven oscillating movements ( 7b ; 8b ) can be controlled electrically and / or hydraulically with unequal strokes, the in the casting direction ( 6 ) front oscillation drive ( 8th ) over shorter strokes compared to the rear oscillation drive ( 7 ) is controlled. A method according to claim 1, characterized in that on the basis of variable, shorter strokes of the front oscillation drive ( 8th ) the oscillation curve ( 14 ) and / or the format thickness ( 13 ) when casting casting strands of different thickness ( 2 ) can be set. Device for the oscillation of a continuous casting mold ( 1 ) and to guide the casting strand ( 2 ) when casting liquid metals, especially liquid steel materials, with one on a lifting table ( 3 ) stored continuous casting mold ( 1 ) and at least two independent hydraulic oscillation drives, which are on the lifting table ( 3 ) attack, as well as with regulating and control devices ( 16 ) for the lifting heights and oscillation movements of the oscillation drives ( 7 ; 8th ), characterized in that in the middle, neutral level ( 15 ) or symmetrical to the middle plane ( 15 ) the pouring vein ( 13a ) in the casting direction ( 6 ) at least two oscillation drives ( 7 ; 8th ) are arranged one behind the other, a first oscillation drive ( 7 ) behind the lifting table ( 3 ) and a second oscillation drive ( 8th ) in front of the lifting table ( 3 ) is arranged. Device according to claim 3, characterized in that the front oscillation drive ( 8th ) depending on the arcuate oscillation movement ( 8b ) and / or the format thickness ( 13 ) of the casting strand ( 2 ) can be adjusted to changed strokes. Device according to one of claims 3 or 4, characterized in that the strokes of the rear oscillation drive ( 7 ) and / or the front oscillation drive ( 8th ) can be changed independently of the set oscillation frequency. Device according to one of claims 3 to 5, characterized in that the regulating and control devices ( 16 ) a hydraulic circuit ( 17 ) for the rear oscillation drive ( 7 ) and essentially the same hydraulic circuit ( 17 ) for the front oscillation drive ( 8th ) exhibit. Device according to claims 3 and 6, characterized in that the hydraulic circuit ( 17 ) of the regulating or control device ( 16 ) for the rear oscillation drive ( 7 ) and the fixed page ( 18 ) of the support roller frame ( 5 ) and the hydraulic circuit ( 17 ) of the regulating or control device ( 16 ) for the front oscillation drive ( 8th ) and the loss side ( 19 ) of the support roller frame ( 5 ) are provided separately. Device according to one of claims 3 to 7, characterized in that the piston-cylinder units ( 20 ) the fixed page ( 18 ) and the loss side ( 19 ) of the support roller frame ( 5 ) each via an electromagnetic valve ( 21 ) to its own pressure source ( 22 ) are connected. Device according to one of claims 3 to 8, characterized in that the piston-cylinder units ( 20 ) at least one hydraulic pressure accumulator ( 28 ) is connected to compensate for pressure fluctuations. Device according to one of claims 3 to 9, characterized in that in the region of the piston-cylinder units ( 20 ) located electronic assemblies by means of compressed air via a connected compressed air pipe ( 23 ) are cooled.