EP4489928A1 - Bogensegment einer strangführungseinrichtung - Google Patents
Bogensegment einer strangführungseinrichtungInfo
- Publication number
- EP4489928A1 EP4489928A1 EP23703560.5A EP23703560A EP4489928A1 EP 4489928 A1 EP4489928 A1 EP 4489928A1 EP 23703560 A EP23703560 A EP 23703560A EP 4489928 A1 EP4489928 A1 EP 4489928A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strand
- strand guide
- casting
- guide rollers
- rollers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1285—Segment changing devices for supporting or guiding frames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/14—Plants for continuous casting
- B22D11/142—Plants for continuous casting for curved casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1282—Vertical casting and curving the cast stock to the horizontal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
Definitions
- the invention relates to an arch segment in the arch area of a strand guide device for guiding and deflecting a cast metal strand into the horizontal after leaving a mold.
- the invention also relates to a strand guiding device with such an arc segment.
- Strand guide devices with arc segments are basically known in the prior art, for example from the German patent application DE 10 2008 009 136 A1.
- This patent application teaches that each arch segment has an upper frame and a base on which a plurality of strand guide rollers are rotatably mounted.
- the upper frame and the undertakings are connected to one another, in particular positioned against one another, in such a way that their respective strand guide rollers are spaced apart from one another and form an arcuate guide channel for guiding the casting strand through.
- the individual strand guide rollers on the upper frame and the undertaking may or may not be rotationally driven.
- the casting strand has a tendency to bulge, i.e. bulge, after leaving the mold, particularly due to a so-called ferrostatic pressure that prevails in the interior of the not yet solidified strand, especially where it is in the area the strand guide not e.g. B. is prevented from doing so by strand guide rollers, i.e. in particular in the spaces between two strand guide rollers adjacent in the casting direction.
- the invention is based on the object of providing a known arch segment and a known strand guide with such an arch segment to further develop that a bulge of the casting strand in the curved area of the strand guide is reduced.
- the arch segment according to the invention is characterized in that at least one of the strand guide rollers on the upper frame and/or the lower frame is designed in the form of an axle roller.
- Strand guide rollers support the warm casting strand on its broad sides and are typically dimensioned so that they can accommodate predetermined loads or support loads for supporting the casting strand within the strand guide device and that required adjusting forces can be applied to the casting strand via the strand guide rollers.
- the adjusting forces must be dimensioned large enough, particularly in the case of driven strand guide rollers, to convey the casting strand within the strand guide device.
- the adjusting forces must be dimensioned in such a way that they can counteract the ferrostatic forces of the casting strand that has not yet solidified perpendicular to the surface of the casting strand and thus counteract any bulging of the casting strand.
- the strand guide rollers must be designed or designed.
- the claimed design of at least one of the strand guide rollers as axle rollers with a fixed axis offers the advantage that they can be built with a smaller outside diameter compared to the pin roller with a rotating axis that is common in the prior art for arch segments under the same load, see last paragraph.
- the background is that the clamping point for the fixed axle on axle rollers can absorb loads better than the bearing point for the rotating axle on pin rollers.
- the smaller roller diameter offers the advantage that the distances between two strand guide rollers adjacent in the casting direction on the upper frame and/or the lower frame can be reduced in the casting direction. This allows the number of strand guide rollers on the top and/or the undercarriage to be increased compared to the exclusive use of pin rollers.
- the required load and support loads and adjusting forces of an entire segment area can then be distributed over the larger number of strand guide rollers with the advantage that each individual strand guide roller can be designed for a lower load.
- the smaller (clear) roller spacing and the increased number of strand guide rollers lead to a reduced bulging of the casting strand, ie to a reduced elongation of the outer and especially the inner fibers (liquid - solid phase boundary) of the still warm casting strand in the area between two adjacent strand guide rollers. This enables improved surface and internal quality of the casting strand while at the same time increasing casting speed and thus higher productivity.
- the object of the invention is further achieved by a strand guide device with at least one of the arch segments according to the invention and with preferably a cooling device for the strand guide rollers of the arch segment.
- a strand guide device with at least one of the arch segments according to the invention and with preferably a cooling device for the strand guide rollers of the arch segment.
- the invention can be used in casting systems in the form of arch systems and vertical bending systems alike. Corresponding solutions to the problem are specified in claims 14 and 15.
- Arch systems typically have an arch-shaped mold to which arch segments are connected in the casting direction.
- the strand routing exists Arch systems only consist of arch segments.
- Vertical bending systems on the other hand, have a vertically aligned straight mold to which one or more vertical segments are connected in the casting direction before arc segments are connected to the vertical segments.
- the strand guidance in vertical bending systems consists of both vertical segments and curved segments.
- the present invention relates to the strand guides and the arch segments in arch systems and in vertical turning systems. The invention does not relate to the vertical segments mentioned.
- the present invention and in particular the arch segment according to claim 1 applies equally to both undivided and divided strand guide rollers.
- the strand guide rollers of the arch segments are divided into a plurality of partial rollers over their total bale length, with support bearings for the upper or lower frame being provided between the partial rollers.
- total bale length includes not only the bale lengths of the partial rolls but also the width of the support bearings.
- FIG. 1 shows a strand guiding device, in particular with arch segments according to the invention
- FIG. 2 shows a detailed view of the arch segments according to FIG. 1; and Fig. 3 shows a comparison of pin rollers and axle rollers.
- the invention will be described in detail below with reference to the figures mentioned. The same technical elements are designated with the same reference numerals in all figures.
- Figure 1 shows a casting system 100 according to the invention.
- a melt in particular a steel melt
- an intermediate container 120 typically a so-called distribution channel
- the melt is filled from the intermediate container into a mold 140 via an immersion tube 130.
- the initially still liquid melt is primarily cooled, so that a so-called strand shell is formed on the walls of the mold.
- the cast strand 200 which has been partially solidified in this way and has a solid strand shell but still a liquid core, is then pulled out of the mold 140 and deflected horizontally with the help of the segmented strand guide 150.
- Figure 1 shows, using the example of a so-called curved system, that the strand guide in the casting direction G behind the mold 140 initially consists of an arcuate part 150-1 and then of a horizontal part 150-11. Both parts each consist of a plurality of so-called segments arranged one behind the other in the casting direction G in order to guide the casting strand.
- Each segment consists of an upper frame 162 and a lower frame 164, on each of which a preferably identical plurality of strand guide rollers 170 is rotatably mounted.
- the upper frame and the companies 162, 164 are connected to one another in such a way that their respective strand guide rollers 170 are spaced apart from one another and create a guide channel for guiding the casting strand 200 through.
- the strand guide 150-1 is arcuate because the strand guide rollers 170 provide an arcuate guide channel for the cast strand 200 there.
- the segments there are therefore also referred to as arc segments 160.
- Fig. 2 illustrates two such arc segments 160 in detail. What can be seen in particular is the arcuate guide channel spanned by the arc segments 160, the outer radius r of which corresponds to the radius of the casting arc.
- the arch segments 160 may have driven and/or non-driven strand guide rollers 170.
- the arch segments are the subject of the present invention. In Figures 1 and 2, the white strand guide rollers symbolize that they are not driven, while the strand guide rollers marked by a cross symbolize driven rollers.
- the rollers of the strand guide segments form a horizontal, straight guide channel.
- the segments with a straight guide channel are not the subject of the present invention.
- Figure 3 illustrates two different basic types of strand guide rollers, namely so-called pin rollers, as shown in the upper figure of Figure 3, and so-called axle rollers, or also called jacket rollers, as shown in the lower figure of Figure 3.
- the difference between the two types of rollers is that in the journal roller the roller axis and the roller barrel are designed in one piece, while the axle roller is designed in several parts.
- the axle roller typically has a fixed, i.e. non-rotating axle and a roller jacket is rotatably mounted on this axis of rotation via a roller bearing.
- the pin roller is typically used as a drive roller because a drive torque acting on the pin of the pin roller is also transmitted directly to the ball of the pin roller.
- the axle roller is typically not used as a driven roller because, as mentioned, its axle is typically clamped in a rotationally fixed manner.
- At least one of the strand guide rollers on the upper frame 162 and / or the company 164 in the form of a Axis roller is formed.
- the arch segment 160 has at least one driven and/or non-driven strand guide roller 170 on its upper frame 162.
- the first exemplary embodiment provides for the respective driven strand guide rollers 170 to be designed in the form of a pin roller. At least some of the non-driven strand guide rollers 170, preferably at least three, more preferably at least five, more preferably all of them are designed in the form of axle rollers.
- the design of the driven strand guide rollers in the form of pin rollers is still necessary in order to transmit the torque of a drive device via the pin of the roller to the bale of the pin roller.
- non-driven strand guide rollers there is no need for a rotary drive and therefore, according to the present invention, they are designed in the form of axle rollers in order to be able to exploit the associated advantages described above, in particular the reduced roller distances a with two strand guide rollers next to one another in the casting direction.
- the driven pin rollers may have a larger diameter than the non-driven axle rollers.
- the radius r of the casting arc of the arc segment is less than or equal to 7m.
- the casting arc is measured, as shown in Figure 2, from the center of the arc of the strand guide to the support surface for the casting strand within the strand guide device formed by the outer sides of the strand guide rollers of the subframe.
- the clear distance d between the outer surfaces of 2 strand guide rollers 170 on the upper frame 162 and the undertaking 164, which face each other as a pair of rollers transversely to the casting direction G is less than or equal to 210 mm.
- At least 6, preferably at least 7, more preferably at least 8 or more preferably at least 9 strand guide rollers are rotatably mounted on the upper frame and the undertaking.
- the strand guide rollers of the arch segment according to the invention each have a total bale length transverse to the casting direction of up to 2,400 mm. This enables the arch segment according to the invention to be able to guide casting strands with widths of up to 2,350 mm, preferably up to 2,200 mm.
- the strand guide device typically has a secondary cooling device for cooling the cast strand.
- the nozzles of the secondary cooling device are then typically arranged between two strand guide rollers adjacent in the casting direction and aligned so that coolant sprays through the gap between the two adjacent strand guide rollers onto the casting strand guided in the strand guide device.
- a minimum dimension is required for the clear distance a between two strand guide rollers adjacent in the casting direction, which is, for example, 40-50mm.
- the clear distance a is a maximum of 50mm, preferably a maximum of 45mm.
- these nozzles of the secondary cooling device can also be used to Cool strand guide rollers from the outside. Therefore, the present invention provides that the nozzles of the strand guide device are designed and aligned to spray coolant not only onto the casting strand, but also onto the strand guide rollers. In this way, the strand guide rollers are cooled from the outside.
- this type of cooling can also be used for the driven strand guide rollers, which according to the invention are typically designed as pin rollers, regardless of whether the pin rollers are cooled internally or not. If necessary, both the internal cooling and the external cooling work together through the nozzles of the secondary cooling device.
- the secondary cooling device is also not available for cooling the strand guide rollers.
- the warm casting strand is cooled via contact with the strand guide rollers and the prevailing ambient temperature.
- the (clear) distance a between two strand guide rollers adjacent in the casting direction can theoretically be reduced to a minimum of Omm on the fixed and loose sides of the arch segment.
- the fixed side of the arch segment is typically formed on the outside of the arch by the companies 164, while the loose side is formed on the inside of the arch by the upper frames 162.
- the strand guide rollers can also be cooled by the external cooling device, the nozzles of which are then arranged and designed in such a way that they direct coolant (only) onto the outer sides of the strand guide rollers 170 (and not directly onto the casting strand). This applies regardless of whether the strand guide rollers are driven or not.
- the external cooling has an additional effect.
- the cooling device if it is only provided - as described - for external cooling of the strand guide rollers, can be equipped with a smaller cooling capacity than the secondary cooling device, which is designed to cool the casting strand.
- the external cooling only needs to be dimensioned so that it is sufficient to cool the strand guide rollers; it does not have to be designed for cooling the casting strand.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022202362.5A DE102022202362A1 (de) | 2022-03-09 | 2022-03-09 | Bogensegment einer Strangführungseinrichtung |
| PCT/EP2023/052690 WO2023169747A1 (de) | 2022-03-09 | 2023-02-03 | Bogensegment einer strangführungseinrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4489928A1 true EP4489928A1 (de) | 2025-01-15 |
| EP4489928B1 EP4489928B1 (de) | 2025-09-17 |
Family
ID=85175689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23703560.5A Active EP4489928B1 (de) | 2022-03-09 | 2023-02-03 | Bogensegment einer strangführungseinrichtung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20250178077A1 (de) |
| EP (1) | EP4489928B1 (de) |
| DE (1) | DE102022202362A1 (de) |
| WO (1) | WO2023169747A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008009136A1 (de) | 2008-02-14 | 2009-10-15 | Sms Siemag Aktiengesellschaft | Strangführung, insbesondere für eine Stahlbrammen-Stranggießanlage |
| RU2553139C2 (ru) * | 2012-07-04 | 2015-06-10 | Актиеболагет Скф | Распределяющий элемент, роликовая линия и устройство для непрерывной разливки |
| DE102013212951A1 (de) * | 2013-07-03 | 2015-01-22 | Sms Siemag Ag | Gießwalzanlage und Verfahren zum Herstellen von metallischem Walzgut |
| DE102015202608A1 (de) * | 2015-02-13 | 2016-08-18 | Sms Group Gmbh | Gießanlage |
| DE102020200001A1 (de) * | 2020-01-01 | 2021-07-01 | Aktiebolaget Skf | Rollenlinieneinheit & Stranggießanlage |
-
2022
- 2022-03-09 DE DE102022202362.5A patent/DE102022202362A1/de active Pending
-
2023
- 2023-02-03 WO PCT/EP2023/052690 patent/WO2023169747A1/de not_active Ceased
- 2023-02-03 EP EP23703560.5A patent/EP4489928B1/de active Active
- 2023-02-03 US US18/844,974 patent/US20250178077A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022202362A1 (de) | 2023-09-14 |
| EP4489928B1 (de) | 2025-09-17 |
| US20250178077A1 (en) | 2025-06-05 |
| WO2023169747A1 (de) | 2023-09-14 |
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