EP0545104B1 - Method and apparatus for continuous casting of ingots or blooms - Google Patents

Method and apparatus for continuous casting of ingots or blooms Download PDF

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Publication number
EP0545104B1
EP0545104B1 EP92119157A EP92119157A EP0545104B1 EP 0545104 B1 EP0545104 B1 EP 0545104B1 EP 92119157 A EP92119157 A EP 92119157A EP 92119157 A EP92119157 A EP 92119157A EP 0545104 B1 EP0545104 B1 EP 0545104B1
Authority
EP
European Patent Office
Prior art keywords
spindles
casting
continuous casting
soft reduction
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.)
Revoked
Application number
EP92119157A
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German (de)
French (fr)
Other versions
EP0545104A3 (en
EP0545104A2 (en
Inventor
Hans Streubel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
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SMS Schloemann-Siemag AG
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Filing date
Publication date
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Priority to DE19914138740 priority Critical patent/DE4138740A1/en
Priority to DE4138740 priority
Application filed by SMS Schloemann-Siemag AG filed Critical SMS Schloemann-Siemag AG
Publication of EP0545104A2 publication Critical patent/EP0545104A2/en
Publication of EP0545104A3 publication Critical patent/EP0545104A3/en
Application granted granted Critical
Publication of EP0545104B1 publication Critical patent/EP0545104B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6445547&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0545104(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Anticipated expiration legal-status Critical
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/128Accessories for subsequent treating or working cast stock in situ for removing

Description

  • The invention relates to a method and a device for the continuous casting of slabs or blocks in a continuous casting installation with a soft reduction path, which can be adjusted individually or as a segment by means of hydraulic cylinders against one another and can be infinitely adjusted with respect to one another by means of spindles.
  • Continuous casting plants, in which a plurality of opposing pairs of rollers are combined into one unit in a strand guide segment, have become known from GB-A-1 166 044 and EP-A-0 194 656. The strand guide segments are assigned several hydraulic cylinders with which, for example, the rollers above the strand can be adjusted against the lower rollers. By means of the supporting or adjusting means in the form of threaded spindles assigned to the hydraulic cylinders, which are acted upon by mechanical adjusting devices, fine adjustments can be made, namely in the event of deviations from the desired thickness of the cast strand. The slabs or blocks produced in such continuous casting plants serve as the starting material for rolling mill products, such as in particular slabs or thin slabs for the production of sheets or strips. In order to reduce segregation in the strand during casting and to achieve a better structure, a thickness reduction between 0.5 mm per meter and 3 mm per meter is carried out in a soft reduction section of the continuous casting plant in the area of final solidification.
  • When continuously casting slabs or blocks, for example in an arc continuous caster, the width of the mouth is adjusted according to the shrinking behavior of the strand over the length of the machine. In the soft-reduction section, the pairs of rolls, individually or combined into segments, are adjusted more closely beyond the shrinking behavior of the strand in order to (The page 2 of the original documents remains unchanged.)
  • Residual solidification to achieve an improvement in internal quality. Truss and roll deflections, e.g. through the use of split continuous casters, can be kept small across the width of the strand.
  • In the case of rollers mounted in segments, the upper yoke is inclined from the inlet towards the outlet so that there is a smaller mouth width on the outlet side than on the inlet side. However, the soft reduction no longer leads to an improvement in the internal structure of the cast strand if the strand has already solidified before entering the soft reduction path or if it has not solidified at the end of the soft reduction path. The strand should therefore run into this stretch with a targeted reduction in thickness with a residual sump and be solidified at the end of the soft reduction stretch. However, this often fails due to the changing casting parameters, such as in particular the casting speed, the steel temperature, the steel quality and the secondary cooling, because the mouth width set during the casting break or the clear distance in the soft reduction section only corresponds to a narrow casting speed range. If the residual solidification is not in the soft reduction section, there is no reduction in segregation and no compression of the core structure.
  • It has therefore already been proposed to adjust the clear distance or the mouth width during casting via spindles depending on the current casting parameters. This solution has the disadvantage that the spindles and the drive elements have to be designed for adjustment under load. With a solidified slab, the force on the spindles can correspond to the cylinder force. Another proposal to solve the problem, namely the clear distance or the mouth width via hydraulic cylinders With built-in inductive displacement measurement and servo valves, it can be set continuously, is cost-intensive and requires a high level of maintenance. In both cases, a computational or metrological determination of the position of the swamp tip is required.
  • The invention has for its object to provide a method and an apparatus that with simple means a dynamic distance or mouth width adjustment even during the casting operation, i.e. enable under load, especially in adaptation to the changing position of the soft reduction section due to changing casting parameters.
  • This object is achieved in that the contact force is reduced during the casting and the spindles are moved to a desired width-reduced dimension. The desired jaw width can thus be adjusted continuously using the reduced-load spindles. For this purpose, pressure transducers, which enable continuous force measurement, can be arranged between the spindles in the upper part of the segment and the lower part of the segment. Due to this astonishingly simple measure of pressure relief, an essentially load-free, inexpensive and reliable adjustment of the spindles inside and outside the cooling chamber of the continuous casting plant can be achieved. Another considerable advantage is that the length of the soft reduction section and the reduction in thickness can be adapted to the casting speed, ie at a lower casting speed the length of the soft reduction section is shortened and the thickness decrease in mm per meter; at higher speeds, however, the length of the soft reduction section is increased. Finally, it is possible that Thickness reduction can be set differently within the soft reduction range and thus support the improvement of the internal quality.
  • If the difference between the cylinder force and the ferrostatic load is advantageously measured continuously, on the one hand the hydraulic pressure of the adjusting cylinders can be reduced during casting so that the force acting on the spindle can only be a fraction of the operating force - the maximum force that occurs during operation up to 100 t, if, for example the strand is solidified - corresponds, for example, to just 2 to 3 t, so that an opening width adjustment is possible in a simple manner, for which only a low drive power is required. On the other hand, an excess of force can be determined and, from the forces which occur, it can be concluded where the strand still has a residual sump or where it has solidified and thus determine the position of the soft reduction path. This enables rapid process optimization in the sense that the exact position of the soft reduction section and the decrease in thickness can be determined as a function of essentially the casting speed, the secondary cooling and the steel quality.
  • The spindles can be based on a load cell according to a proposal of the invention. These show both the excess force from the segment or roller locking force that enables the determination of the soft reduction path and the relieved hydraulic pressure, which enables the spindles to be moved with reduced load during casting.
  • According to a further proposal of the invention, the spindles can be driven against a hydraulic stop which is subjected to a force which exceeds the locking or setting force is. In this case, only the hydraulics need to be depressurized to adjust the rollers to a new internal width dimension or a new clearance dimension, and the spindles can then be moved to the new dimension with reduced load.
  • It is proposed that a plunger is arranged between a spindle and a support of the lower yoke, which has a fixed stop in its cylinder space. In the casting operation, the plungers can be driven against their fixed stops with an excess of force, which support the spindles with a pressure exceeding the starting pressure. In order to be able to make adjustments to the internal dimension or spacing during casting, it is only necessary to depressurize the plungers, and the spindles can then be moved to the new dimension with reduced load. After the adjustment, the plungers are pressurized again until they come into contact with the pistons against the fixed stops; in this position the rollers then take the desired distance from each other.
  • The invention is explained in more detail below on the basis of the exemplary embodiments illustrated in the drawings. The drawings show:
  • Figure 1
    an inventive strand guide segment with adjusting spindles based on pressure cells in the front view;
    Figure 2
    a strand guide segment of FIG 1, but with adjusting spindles based on plungers.
    Figure 3
    a strand guide segment shown in Figures 1 and 2 in the side view. and
    Figure 4
    3 shows a top view of the strand guide segment according to FIG. 3.
  • In a continuous caster, not shown, for casting slabs or blocks, numerous rollers 2, either arranged individually or in strand guide segments 1, form a guide, which may have a thickness reduction on an extruded strand 3 (see FIG. 3). The rollers 2 can be adjusted to one another to the desired thickness 4 by means of hydraulic cylinders 5, the cylinder tubes 6 of which are fastened to the lower yoke 7 and the piston rods 8 of which engage the upper yoke 9 of the strand guide segment 1, as is shown in FIGS. 1 and 2. Each at the inlet and outlet 11 or 12 (see FIG. 3) of the strand guide segment 1 are paired, adjustable by a motor 13, a gear 14 and drive shafts 15 (see FIG. 4) adjustable or adjusting spindles 16 1, which are based on pressure transducers 17 in the embodiment according to FIG. 1 and on plungers 18 in the embodiment according to FIG. 2, which are arranged on a support 19 of the lower yoke 7. The cylinder housings 21 of the plungers 18 have a fixed stop 23 in their cylinder space 22, against which the plungers 24 bear.
  • Both by means of the pressure transducers 17 and the plungers 18, it is possible to adjust the pressure spindles 16 also during the casting, ie dynamically, since they allow the pressure spindles 16 to be relieved. In order to adjust the thickness dimension or the clear distance 4 between two rollers 2 or in the case of rollers 2 mounted in strand guide segments 1, the mouth width 25 or 26 (see FIG. 3), the pressure prevailing in the hydraulic cylinders 5 is reduced, which is caused by the Pressure transducers 17 measured and is displayed so that the pressure spindles 16 can be adjusted to the new dimension via the drive (motor 13, gear 14, drive shafts 15). The same effect, namely the reduced-load adjustment of the pressure spindles 16 during the casting operation is achieved in the embodiment according to FIG. 2 with the support of the pressure spindles 16 on the plunger 18 in that the plungers 18 in the casting operation with excess force with their pistons 24 against the fixed stops 23 in the cylinder space 22 can be driven. For adjustment during casting, the plungers 18 are depressurized, and the pressure spindles 16 relieved in this way can be moved to the new jaw size 25, 26 or 4.
  • The thus reduced-load adjustment of the pressure spindles 16 makes it possible to adapt the rolls to be moved closer to one another in this zone than required as a result of the shrinkage of the strand, even during operation, to changing casting parameters in a continuous casting installation. The soft reduction section is located where there is still a residual sump 27 in the section 3, but after the exit from the soft reduction section the section is completely solidified (cf. FIG. 3); it shifts - in relation to the strand running direction - with changing casting parameters such as, in particular, different casting speeds up or down. The forces are measured continuously by means of the pressure load cells 17 and can be inferred from measured values which differ from one another, where the strand 3 still has a residual sump 27 or where it has already solidified. If it is found that the position of the soft reduction path has shifted, it is now possible to adjust the strand guide rollers 2 during the casting operation and to adapt them to the position of the soft reduction path, ie to adjust them more closely than is necessary due to the shrinkage , since the pressure spindles 16 reduced load can be adjusted.
  • If the strand guide rollers 2 are mounted in a segment 1, as shown in FIG. 3, the upper yoke 9 is inclined towards the outlet 12 on the basis of the measured values, so that the mouth width 25 is greater at the inlet 11 than at the outlet 12 (cf. Mouth width 26 in Fig. 3) results. The wedge can be adjusted in accordance with the residual sump 27 so that the strand 3 within the solidification section is as short as possible before the solidification point - cf. in Fig. 3 the sump tip numbered 28 - a deformation with a decrease in thickness of e.g. 0.5 mm to 3 mm per meter. Based on the determination of the changing position of the soft reduction path and the reduced-load adjustment of the pressure spindles 16 during the casting operation, the strand guide rollers 2 - regardless of whether they can be adjusted individually or as a segment - can always be adjusted to changing casting parameters and / or one correspondingly Adapt the changing position of the sump tip 28.
  • In order that the wedge shape shown in FIG. 3 towards the outlet 12 can be achieved in the case of guide rollers 2 mounted in strand guide segments 1, position adjusters 29 (see FIG. 4) are also assigned to the spindle adjustments, which - starting from a calibration value which can be e.g. can be reached by lowering the upper yoke 9 to fixed stops - allow a more or less wide opening at the inlet and outlet 11, 12.

Claims (6)

  1. Method for continuous casting of slabs or blocks in a continuous casting plant with a soft reduction path, which comprises rollers adjustable relative to one another individually or as a segment by means of hydraulic cylinders and steplessly settable relative to one another in their clear spacing (gap width) by means of spindles, characterised thereby that the adjusting force reduces during the casting and the spindles are driven load-reduced to a desired gap width dimension.
  2. Method according to claim 1, characterised thereby that the difference between cylinder force and ferrostatic load is continuously measured.
  3. Method according to claim 1 or 2, characterised thereby that the spindles are driven against a hydraulic abutment.
  4. Device for performance of the method according to claim 1, in a continuous casting plant with a soft reduction path, which comprises rollers (2) adjustable relative to one another individually or as a segment by means of hydraulic cylinders and steplessly settable relative to one another in their clear spacing (gap width) by means of spindles (14), characterised thereby that the spindles (14) are supported on pressure elements (17), which continuously measure the adjusting force, and are connected with an adjusting drive (13, 14, 15).
  5. Device for performance of the method according to claim 1, characterised thereby that a respective plunger (18) is arranged between each spindle (16) and a support (19) of the lower yoke (7).
  6. Device according to claim 5, characterised thereby that the plunger (18) comprises a fixed abutment (23) in its cylinder chamber (21).
EP92119157A 1991-11-26 1992-11-09 Method and apparatus for continuous casting of ingots or blooms Revoked EP0545104B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19914138740 DE4138740A1 (en) 1991-11-26 1991-11-26 METHOD AND DEVICE FOR CONTINUOUSLY casting slabs or blocks
DE4138740 1991-11-26

Publications (3)

Publication Number Publication Date
EP0545104A2 EP0545104A2 (en) 1993-06-09
EP0545104A3 EP0545104A3 (en) 1993-06-30
EP0545104B1 true EP0545104B1 (en) 1997-04-02

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EP92119157A Revoked EP0545104B1 (en) 1991-11-26 1992-11-09 Method and apparatus for continuous casting of ingots or blooms

Country Status (6)

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US (1) US5348074A (en)
EP (1) EP0545104B1 (en)
AT (1) AT150993T (en)
CA (1) CA2083804C (en)
DE (1) DE4138740A1 (en)
ES (1) ES2099784T3 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5577548A (en) * 1993-10-14 1996-11-26 Voest-Alpine Industrieanlagenbau Gmbh Continuous casting process and plant
EP0875316A2 (en) * 1997-04-24 1998-11-04 MANNESMANN Aktiengesellschaft Strand withdrawing apparatus
EP1060816A1 (en) * 1999-06-19 2000-12-20 SMS Demag AG Device for adjusting strand guiding segments of a twin roll continuous casting installation
US6568459B2 (en) 1999-07-16 2003-05-27 Mannesmann Ag Process and apparatus for casting a continuous metal strand
US6568460B1 (en) 1999-04-10 2003-05-27 Sms Schloemann-Siemag Aktiengesellschaft Method and apparatus for adjusting the profile of a continuously cast slab, particularly of a thin slab

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2697182B1 (en) * 1992-10-26 1995-01-13 Clecim Sa Device for guiding a casting bar from the exit of its casting wheel to the entry of a rolling mill.
FR2728817B1 (en) * 1994-12-29 1997-02-28
DE19511113A1 (en) * 1995-03-25 1996-09-26 Schloemann Siemag Ag Strand guidance of a continuous caster for thin slabs
AT404807B (en) * 1996-05-08 1999-03-25 Voest Alpine Ind Anlagen Actuating device for setting the location of strand support elements
DE19627336C1 (en) * 1996-06-28 1997-09-18 Mannesmann Ag Guiding a cast strip in e.g. steel strip casting units
DE19745056A1 (en) * 1997-10-11 1999-04-15 Schloemann Siemag Ag Process and plant for producing slabs in a continuous caster
DE19809807C2 (en) 1998-03-09 2003-03-27 Sms Demag Ag Setting process for a roller segment of a continuous caster
DE19824366A1 (en) * 1998-05-30 1999-12-02 Schloemann Siemag Ag Strand guide segment for slab caster
DE19921296A1 (en) * 1999-05-07 2000-11-09 Sms Demag Ag Method and device for the production of continuously cast steel products
DE10007706A1 (en) * 2000-02-19 2001-08-23 Sms Demag Ag Process and plant for casting primary products in a continuous caster
DE10011689A1 (en) 2000-03-10 2001-09-13 Sms Demag Ag Process for the continuous casting of slabs and in particular thin slabs
DE10040271A1 (en) * 2000-08-17 2002-02-28 Sms Demag Ag Device for the continuous casting of metals, in particular steel
AT409465B (en) * 2000-12-12 2002-08-26 Voest Alpine Ind Anlagen Method for adjusting a casting split on a strand guide of a continuous casting system
DE10118518A1 (en) * 2001-04-14 2002-10-24 Sms Demag Ag Process for continuously casting slabs, especially thin slabs, in a continuously casting device comprises forming bulges from a casting strand within a region of a liquid core path
DE10119550A1 (en) * 2001-04-21 2002-10-24 Sms Demag Ag Production of continuously cast pre-material comprises casting strands in a continuous casting device, deforming below the mold and/or within or outside the strand guide using roller pairs to form pre-profiles, and rolling into profiles
DE10122118A1 (en) 2001-05-07 2002-11-14 Sms Demag Ag Method and device for the continuous casting of blocks, slabs and thin slabs
DE10153960A1 (en) * 2001-11-06 2003-05-22 Sms Demag Ag Method and casting machine for the continuous casting of billet and block formats or the like
CA2470961C (en) * 2002-02-22 2010-11-09 Axel Weyer Method and device for the continuous casting and direct shaping of a metal strand, in particular a steel cast strand
JP4218383B2 (en) * 2002-04-08 2009-02-04 住友金属工業株式会社 Continuous casting method, continuous casting apparatus and continuous cast slab
DE102004002783A1 (en) * 2004-01-20 2005-08-04 Sms Demag Ag Method and device for determining the position of the sump tip in the casting strand in the continuous casting of liquid metals, in particular of liquid steel materials
DE102006048511A1 (en) * 2006-10-13 2008-04-17 Sms Demag Ag Strand guiding device and method for its operation
US10226801B2 (en) 2012-01-12 2019-03-12 Nippon Steel & Sumitomo Metal Corporation Casting product reduction apparatus
KR101752991B1 (en) * 2013-05-02 2017-07-03 신닛테츠스미킨 카부시키카이샤 Continuous casting facility
JP2015226918A (en) * 2014-05-30 2015-12-17 新日鐵住金株式会社 Steel continuous casting method

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US3891025A (en) * 1972-06-29 1975-06-24 Schloemann Siemag Ag Apparatus for withdrawing a casting and feeding a dummy bar in a continuous casting machine for steel
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5577548A (en) * 1993-10-14 1996-11-26 Voest-Alpine Industrieanlagenbau Gmbh Continuous casting process and plant
EP0875316A2 (en) * 1997-04-24 1998-11-04 MANNESMANN Aktiengesellschaft Strand withdrawing apparatus
US6062295A (en) * 1997-04-24 2000-05-16 Mannesmann Aktiengesellschaft Device for withdrawing a strand
US6568460B1 (en) 1999-04-10 2003-05-27 Sms Schloemann-Siemag Aktiengesellschaft Method and apparatus for adjusting the profile of a continuously cast slab, particularly of a thin slab
EP1060816A1 (en) * 1999-06-19 2000-12-20 SMS Demag AG Device for adjusting strand guiding segments of a twin roll continuous casting installation
US6568459B2 (en) 1999-07-16 2003-05-27 Mannesmann Ag Process and apparatus for casting a continuous metal strand

Also Published As

Publication number Publication date
EP0545104A2 (en) 1993-06-09
AT150993T (en) 1997-04-15
US5348074A (en) 1994-09-20
EP0545104A3 (en) 1993-06-30
DE4138740A1 (en) 1993-05-27
ES2099784T3 (en) 1997-06-01
CA2083804C (en) 2000-05-23
CA2083804A1 (en) 1993-05-27

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