WO2016128149A1

WO2016128149A1 - Casting system

Info

Publication number: WO2016128149A1
Application number: PCT/EP2016/050067
Authority: WO
Inventors: Thomas Heimann; Uwe Plociennik; Markus Reifferscheid; Christoph Tischner
Original assignee: Sms Group Gmbh
Priority date: 2015-02-13
Filing date: 2016-01-05
Publication date: 2016-08-18
Also published as: EP3256276B1; DE102015202608A1; EP3256276A1

Abstract

The invention relates to a casting system for casting liquid metal, in particular steel, into a cast strand. The casting system comprises a mold for producing a cast strand from the supplied metal melt and a strand guide for moving the cast strand into a horizontal position. The strand guide has at least one input roller segment arranged after the mold in the casting direction and, further thereafter, an output roller segment. In order to be able to produce and maintain the strand guide more simply and more economically, the input roller segment and the output roller segment of the strand guide, according to the invention, are structurally identical.

Description

casting plant

The invention relates to a casting plant for the casting of liquid metal, in particular steel to a casting strand.

Casting plants are basically known in the prior art, for example from Austrian Pat. No. 2,445,222 and German

Laid-Open Specification 2,117,110. Both documents disclose a casting installation with a mold for producing a casting strand from supplied molten metal and a strand guide for transferring the casting strand into the horizontal. The strand guide has at least one of the mold in the casting direction downstream input roller segment and the input roller segment downstream in the casting direction output roller segment.

Based on this prior art, the invention has the object, the strand guide of a known casting plant to the effect

educate that it is easier and cheaper to manufacture and maintain.

This object is solved by the subject matter of patent claim 1. This is characterized for the casting machine described in the introduction, characterized in that the input roller segment and the output roller segment of the strand guide are of identical construction.

The structurally identical design of the two segments in the strand guide saves the development and production of different roller segments. The development and production costs of the strand guide are therefore lower than in a strand guide, which has only each different roll segments. For the operator of the casting plant is also the maintenance of each Roller segments cheaper, because only one type of role segment held and maintained.

Within the scope of the present description, the term "roller segment" means in each case a segment consisting of a top frame and a bottom frame, on each of which a plurality of strand guide rollers are rotatably mounted. while the subframe, with its strand guide rollers mounted thereon, faces the underside of the cast strand, the top frame and the subframe are

typically via mechanical bolts or hydraulic cylinders fixed or variable spaced apart and interconnected. The cast strand is passed between the upper frame and the subframe. In each case one strand guide roller mounted on the upper frame forms a pair of rollers together with an opposite strand guide roller rotatably mounted on the subframe. In the context of the present invention, the term "roller segment" expressly does not mean single rollers or individual roller pairs, but exclusively the said segment construction

Intermediate roller segment without drive, d. H. without drive, stored. They are therefore not suitable, the cast strand from the mold and through the

Promote strand guide through.

According to a first embodiment, it is therefore necessary that a driving device is arranged in the casting direction behind the strand guide for pulling the casting strand out of the strand guide. The mold can be used as a funnel mold or as a parallel mold with parallel

Be formed broad side walls. Regardless, the mold may be straight or curved.

According to a preferred embodiment, the strand guide has only two roller segments, namely the said input roller segment and the identical output roller segment, wherein the two roller segments are then arranged directly behind one another in the casting direction and wherein the

Input radius of the output roller segment the output radius of the

Input roller segment corresponds.

In this constellation, the longitudinal section of the input roller segment and the output roller segment can each extend over an angular range of 45 °. The two successively arranged roller segments then cover a quarter circle completely.

Alternatively, the input roller segment and the output roller segment can also be designed such that their longitudinal sections only extend over an angular range of less than 45 °.

As an alternative to the configuration of the strand guide with only two roller segments, namely the input roller segment and the same

Outgoing roll segment, the strand guide between the

Input roller segment and the identical output roller segment also have an intermediate roller segment, wherein the input radius of the

Zwischenrollensegmentes then the output radius of the

Input roller segment and the output radius of the intermediate roller segment should then correspond to the input radius of the Ausgangsrollensegmentes to a smooth as possible, d. H. kink-free transition of the casting strand in the

To realize horizontal. The ZwischenroNensegment is then preferably formed with a circular arc or Doppelklothoidenförmigen longitudinal section.

The input roll segment and the output roll segment are in their

Longitudinal section each formed in a circular arc or in the form of a clothoid or each with a straight and a subsequent arcuate section.

To in a casting plant with a strand guide, which only the

Input role segment and the output role segment, so no

ZwischenroNensegment has, as smooth as possible, d. H. To realize kink-free deflection of the casting strand from the vertical to the horizontal, it is necessary to arrange the output roll segment in the strand guide such that its input radius corresponds to the output radius of the input roll segment. In the formation of the input and the output roller segment with a circular longitudinal section, this is automatically the case. In the formation of the input roller segment and the output roller segment with, however, klothoidenförmigem longitudinal section or with a straight and a subsequent arcuate section in longitudinal section, it is then necessary that the output roller segment mirrored to the identical

Input roller segment is arranged in the strand guide. These

mirror-offset arrangement is therefore necessary because in the two last-mentioned longitudinal sectional forms the input and the output roller segment each have a different from their output radius input radius

exhibit. Nevertheless, the smooth transition to the horizontal

Required condition that the input radius of the Ausgangsrollensegmentes corresponds to the output radius of the input roller segment, the said mirror offset arrangement of the output roller segment in the strand guide is required. In all cases in which the cast strand does not leave the strand guide tension-free in the direction of the horizontal, ie in particular in which the Strand guide rollers of Ausgangsrollensegment.es not already act as straightening rollers, it is necessary that the output roller segment in the casting direction is followed by a separate straightening device for transferring the

Casting strand in the horizontal. This is typically required, in particular, if the starting roll segment-just like the identical entry roll segment-is formed with a circular-arc-shaped or clothoid-shaped longitudinal cut.

The straightening device and the driver device can be designed as a structural unit, which reduces costs.

If the input and the output roller segment are each formed with a circular longitudinal section, they may, for example, have a radius of 2,100 mm and 10 strand guide roller pairs each.

The strand guide rollers of the input roller segment, the

Zwischenrollensegmentes or the output roller segment can be designed as axle or as a pin rollers. The strand guide may be followed by a furnace device in the casting direction for homogenizing the temperature of the casting strand.

The driver device, the straightening device or the structural unit can be arranged either between the strand guide and the furnace device or within the furnace device.

Between the output of the driver device and the furnace device or in the casting direction behind the furnace means a pair of scissors is provided for dividing the cast strand into slabs of suitable length. Advantageously, the maximum height of the casting plant from the entrance of the mold to the horizontal outlet of the strand guide is 4 m. The horizontal extent of the casting plant from the mold to the end of the strand guide is advantageously 3 m. The low height and the short length of the casting advantageously allow a relatively high exit temperature of the casting from the casting machine, this exit temperature is already close to the required inlet temperature of the casting in a casting plant typically downstream rolling mill. For this reason, the energy costs for reheating the casting strand before rolling

be kept comparatively low. The low height and the short length of the caster also favor the construction smaller

inexpensive casting halls.

Further advantageous embodiments of the casting plant according to the invention are the subject of the dependent claims.

The description is a total of 8 figures attached, where

Figure 1 shows a first embodiment of the casting machine according to the invention with a straight mold and clothoid-shaped strand guide;

Figure 2 shows a fifth embodiment of the casting machine according to the invention with a straight mold and a straight and an arcuate portion in the longitudinal section of the strand guide;

Figure 3 shows a second embodiment of the casting machine according to the invention with a curved mold and in longitudinal section clothoid-shaped strand guide;

Figure 4 shows the casting plant according to the invention with only two segments in the strand guide in a plan view; A third embodiment of the casting installation according to the invention with a bent mold and a circular strand guide and a scissors arranged between the strand guide and a furnace device arranged downstream in the casting direction,

Figure 6 shows a fourth embodiment of the casting machine according to the invention according to the third embodiment, wherein, however, the scissors is not arranged before, but in the casting behind the oven device; the temperature profile of the Gießstrangs when passing through the strand guide according to the invention; and FIG. 8 shows a size comparison of the micro-ultrathin strip production USP plant according to the invention with other known continuous casting plants. The invention will be described in detail below with reference to the said figures in the form of embodiments. In all figures, the same technical elements are designated by the same reference numerals.

FIG. 1 shows a first exemplary embodiment of the casting installation 100 according to the invention. Accordingly, the casting installation comprises a currently constructed and vertically oriented mold 1 10 and a strand guide 120 downstream in the casting direction of the mold. A cast strand 200 cast in the mold is moved into the horizontal with the aid of the strand guide 120 transferred or diverted. For this purpose, the strand guide in the first embodiment comprises only two segments, namely an input roller segment 122, which is arranged directly behind the mold. The input roller segment 122 is a Starting roller segment 124 downstream in casting. The

Input roller segment and the output roller segment are designed identical with, for example, each 12 Strangfuhrungsrollenpaaren. The two segments are each formed in their longitudinal section klothoidenformig. None of the roller pairs of the two segments is rotationally driven and therefore the roller pairs of the segments are not suitable for conveying the strand out of the mold or out of the strand guide. This task is done by one of the

Strand guide in the horizontal downstream driver device 130. As can be seen further in FIG. 1, the driver device 130 in the casting direction R is followed by a pair of scissors 140 and a furnace device 150. The height H of the caster is a maximum of 4 m; Its horizontal extent L is from the mold to the beginning of the horizontal guidance of the casting strand a maximum of 3 m.

The mold 1 10 may be formed as a funnel mold with a cone-shaped enlarged Eingießoffnung for the melt or as a parallel mold with two completely parallel broad side walls. In the one shown in FIG

Embodiment, both the input roller segment 122 as well as the output roller segment 124 in their longitudinal section each have a

Angular range α formed by 45 °. Therefore arranged in the casting direction immediately behind one another they cover a quarter circle to transfer the

Casting strand 200 from the vertical to the horizontal completely off.

The last rolls in the casting direction R of the output roll segment 124 are also used in the first embodiment as counter-pressure rolls for the straightening unit 160. The straightening unit 160 and the drive unit 130 may consist of a single roll

Roll pair exist.

Figure 2 shows a fifth embodiment of the invention

Casting plant. It substantially corresponds to the first embodiment, but with the only difference that the input roller segment 122 and the output roller segment 124 are not strict in their longitudinal section are formed clothoid-shaped, but each has a straight section and a subsequent curved section, here, for example, clothoid-shaped curved section. Compared to the first embodiment, the input segment 122 on the input side of the mold some additional trailing pairs of rollers - exemplified 3 - which are aligned as a straight portion of the input roller segment straight and connect the output of the mold 1 10 with the clothoid arcuate portion of the input roller segment 122. The same design, but compared to

Input roller segment mirrored arranged in the strand guide

Outgoing roll segment 124 comprises on the output side here by way of example three

Roller pairs, which are connected to the clothoid-shaped portion of the

Connect output roller segment 124. These three additional rollers are aligned horizontally. FIG. 3 shows a second exemplary embodiment of the invention

Casting plant. In contrast to the first embodiment shown in Figure 1, a bent mold 1 10 is used here, which in turn also

funnel-shaped or can be formed with completely plane-parallel broadsides. She herself represents or covers from a piece of a quarter circle to

Deflection of the cast strand 200 from the vertical to the horizontal. Therefore, the input roller segment 122 and the identical

Starting roller segment 124 in this case, each with only 10 pairs of rollers build shorter than in the first embodiment shown in Figure 1. With the 10th

Roller pairs is the arc length of the two roller segments 122, 124 chosen so that their transition is at a height of 45 ° of the four-circle; this corresponds to the point section A-A in Figure 3. But because the arc length of the two

Roll segments now no longer each covers a single circle, but is designed to be shorter, the output of the output roller segment 124 is not enough to the horizontal. The transition to the horizontal must therefore be made in this second embodiment of an additionally provided straightening device 160. The straightening device 160 is advantageously provided with a Driver device 130 realized in a structural unit. The structural unit then consists of at least 2 at least partially driven roller pairs. Also in the second embodiment according to FIG. 3, a scissors 140 and a furnace device 150 connect to the driver device 130

Casting direction R on. Also in the second embodiment are

Input roller segment 122 and the output roller segment 124 in their

Longitudinal section clothoid-shaped.

FIG. 4 shows a plan view of the casting installation 100 according to the invention, for example according to the first or second embodiment. The mold 1 can be seen on the left-hand edge of the picture. The mold is followed by the first input roller segment 122 and the output roller segment 124 in the casting direction. To recognize are also the connections 128 for the electrical power supply and the cooling water of the roller segments. Due to the different

Positions of the terminals 128 can be seen that the same

Roller segments 122, 124 in the example shown in Figure 4 and thus also in the first and second embodiments, mirrored in the

Strand guide 120 are arranged. Especially in the training of the

Input roller segment 122 and the output roller segment 124, each with a clothoid-shaped longitudinal section, it is necessary for a smooth, that is kink-free transition between the roller segments, that the input radius of the output roller segment 124 the output radius of the

Input roller segment 122 corresponds. This is achieved by the mirror-offset arrangement of the roller segments according to FIG.

FIG. 5 shows a third exemplary embodiment of the casting installation 100 according to the invention with a curved funnel mold 1 10 and a strand guide 120 adjoining it. The inlet roll segment 122 and the

Starting roller segment 124 are each formed with a circular longitudinal section. Therefore, the input radius of the output roller segment 124 is automatically equal to the output radius of the input roller segment 122 and It therefore does not require a mirror-offset use of the roller segment 124 in the strand guide 120. Preferably, the curvature of the mold 1 10 also corresponds to the radius of the input roller segment, so that even in the transition between the mold 1 10 and the input roller segment 122 no kink in the leadership of the cast strand 200th occurs. The last roles of the

Starting roller segment 124 act again in this third embodiment as an abutment to the sepratraten straightening unit 160. The straightening unit 160 and the driving means 130 for conveying the casting strand 200 from the mold 1 10 and the strand guide 120 and can consist of a single

Roll pair exist. As shown in Fig. 5, the third is also used

Embodiment after the driver device 130, a pair of scissors 140 and 150 furnace device provided.

The first rollers of the input roller segment do not act as bending rollers, because the cast strand already has its own tendency to continue with the mold radius when exited from the curved hopper mold 1 10. It therefore requires no bending forces to the cast strand on another

Bend radius to bring. FIG. 6 shows a fourth exemplary embodiment of the invention

Caster 100. It corresponds in its construction substantially to the third embodiment according to Figure 5, but with the difference that the scissors 140 is arranged in the casting direction not before, but behind the oven device 150. This offers the advantage that the cold strand, with the aid of which the cast strand is first conveyed out of the mold and through the strand guide at the beginning of each melting process, in an area between the strand guide and the kiln inlet from the guide line for the cast strand 200

can be taken out. FIG. 6 shows how, after passing through the strand guide 120, the cold strand can be led upwards outside the casting line. Unlike the third embodiment according to FIG 5 is the

Scissors 140 now no longer in the way the shown Abtrangsport the dummy strand. Due to the repositioning of the scissors, the oven device can be brought closer to the output of the strand guide 120 in this fourth embodiment, whereby advantageously the average temperature of the cast strand in the area between the end of the secondary cooling, ie the end of the output roll segment 124 and the kiln inlet only by approx 20 ° C drops.

FIG. 7 shows a typical temperature profile of the cast strand 200

Pass through the casting plant according to the invention. In FIG. 7, the upper temperature line shows the core temperature, the second or middle temperature line the average temperature, and the lower temperature line the temperature respectively in the middle of the upper side of the cast strand. The graph shows the Temperaturveraluf the cast strand in ° C above the casting direction R starting at the mold level in the mold 1 10. In casting direction, d. H. on the abscissa, following the mold, the input roller segment 122 and this the output roller segment 124 follows. The abscissa is, as I said, the casting direction, d. H. the strand guide length is plotted in meters. This size should not be confused with the horizontal extent of the casting plant, which is typically much shorter. Falling below the core temperature of the casting strand 200 below the line of solidus temperature at about 3.9 m from the casting level represents the position of the sump tip, d. H. the location of the solidification. In this position, which also depends on the casting speed of 5.80 m / min, which is chosen here by way of example, the sump tip is still located in front of the last roll of the strand guide 120, d. H. still within the output roll segment 124. The drop in the

Average temperature between the end of secondary cooling, d. H. The output of the output roller segment 124 and the kiln inlet at a distance of approx. 7.5 m from the casting level is only approx. 60 ° C. As a run-in temperature of the casting strand of 1 .210 ° C in the furnace means for the at the

Furnace 150 subsequent rolling mill is high enough, is only at low casting speeds require a short furnace device 150 or inductive heating.

FIG. 8 shows a merely exemplary size comparison of FIG

According to the invention micro-USP system with known from the prior art continuous casting, on the one hand with a known standard continuous-slap production CSP system and a micro-CSP system. The dimensions given by way of example in tabular form should be self-explanatory.

LIST OF REFERENCE NUMBERS

100 casting plant

1 10 mold

120 strand guide

122 input roll segment

124 output roll segment

126 strand guide roller

128 Connection for electrical and / or cooling water

130 driver device

140 scissors

150 Furnace or inductive heating

160 straightening device

200 cast strand

R casting direction

H height of the casting plant

L horizontal extension of the casting machine α angular range

Claims

claims:

1 . Caster (100) comprising:

a mold (110) for producing a cast strand (200) from supplied molten metal; and

a strand guide (120) for transferring the casting strand (200) in the horizontal with at least one of the mold (1 10) in the casting direction (R) downstream input roller segment (122) and a the

Input roller segment (122) in the casting direction (R) downstream

Exit roller segment (124);

characterized,

the input roller segment (122) and the output roller segment (124) of the strand guide (120) are of identical construction.

2. casting plant (100) according to claim 1,

marked by

a driving device (130) arranged in the casting direction (R) behind the strand guide (120) for pulling the casting strand (200) out of the strand guide (120).

3. casting plant (100) according to one of the preceding claims,

characterized in that

the mold (1 10) is designed as a funnel mold or as a parallel mold.

4. Casting plant (100) according to one of the preceding claims,

characterized in that

the mold (1 10) is straight or curved

5. casting plant (100) according to one of the preceding claims,

characterized in that

the strand guide (120) only the input roll segment (122) and the has identical output roller segment (124), which in the

Strand guide (120) in the casting direction (R) are arranged directly one behind the other, wherein the input radius of the Ausgangsrollensegments (124) corresponds to the output radius of the input roller segment (122).

6. casting plant (100) according to claim 5;

characterized in that

the input roller segment (122) and the output roller segment (124) in their longitudinal section each over an angular range (a) of 45 °

are formed.

7. casting installation (100) according to claim 5,

characterized in that

the input roller segment (122) and the output roller segment (124) are each formed in their longitudinal section over an angular range (a) of less than 45 °;

8. casting plant (100) according to one of claims 1 to 4,

marked by

a disposed in the strand guide (120) between the input roller segment (122) and the output roller segment (124)

Intermediate roller segment with an input radius corresponding to the output radius of the input roller segment (122) and with a

Output radius corresponding to the input radius of the

Output roll segment (124).

9. casting installation (100) according to claim 8,

characterized in that the intermediate roller segment is formed with a circular arc or Doppelklothoidenförmigen longitudinal section.

10. casting plant (100) according to one of the preceding claims, characterized in that

the input roller segment (122) and the output roller segment (124) are each formed in their longitudinal section in a circular arc or in the form of a clothoid or in each case with a straight and a subsequent arcuate section.

1 1 .Gießanlage (100) according to claim 5 and 10,

characterized in that

in training the input and output roller segment (122, 124) with clothoidal longitudinal section or gradem and then arcuate section in longitudinal section of the input and the

Output roll segment (122, 124) each one of hers

Output radius have different input radius; and

the output roller segment (124) in the strand guide (120) is arranged mirror-offset such that its input radius of the

Output radius of the input roller segment (122) corresponds.

12. casting installation (100) according to claim 10,

marked by

one the output roll segment (124) in the casting direction (R)

Downstream straightening device (160) for transferring the casting strand (200) in the horizontal, for example, when the output roll segment is formed with a circular arc or klothoidenförmigem longitudinal section.

13. casting plant (100) according to claim 2 and 12,

characterized in that

the straightening device (160) and driver device (130) are designed as a structural unit.

14. casting installation (100) according to claim 10,

characterized in that

the input and output roller segments (122, 124) each having a circular longitudinal section, advantageously with a radius of at least 2000 mm and exemplarily with 10

Strand guide roller pairs, is formed.

15. casting installation (100) according to one of the preceding claims,

characterized in that

the strand guide rollers (126) of the input, intermediate or output roller segment (122, 124) are formed as axle rollers or pin rollers.

16. casting plant (100) according to one of the preceding claims,

characterized in that

the strand guide (120) in the casting direction (R) a furnace device (150) is connected downstream.

17. Caster (100) according to claim 16,

characterized in that

the driver device (130), the straightening device (160) or the structural unit either between the strand guide (120) and the

Furnace device (150) or within the oven device (150) are arranged.

18. casting installation (100) according to claim 15,

characterized in that

a pair of scissors (140) between the output of the driver means (130) and the oven means (150) or in the casting direction (R) behind the

Furnace device (150) is connected.

19. casting plant (100) according to one of the preceding claims, characterized in that

the height (H) of the caster (100) from the entrance of the mold (1 10) to the horizontal outlet of the strand guide (120) is a maximum of 4 m.

20. casting plant (100) according to one of the preceding claims,

characterized in that

the horizontal extent (L) of the caster (100) from the mold (1 10) to the beginning of the horizontal guidance of the casting strand is a maximum of 3 m.