EP1313579A1 - Stranggiessanlage mit soft-reduction-strecke - Google Patents
Stranggiessanlage mit soft-reduction-streckeInfo
- Publication number
- EP1313579A1 EP1313579A1 EP01969503A EP01969503A EP1313579A1 EP 1313579 A1 EP1313579 A1 EP 1313579A1 EP 01969503 A EP01969503 A EP 01969503A EP 01969503 A EP01969503 A EP 01969503A EP 1313579 A1 EP1313579 A1 EP 1313579A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- soft
- pressure
- printing
- hard
- segment
- 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
- 238000009749 continuous casting Methods 0.000 title claims abstract description 18
- 238000009434 installation Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000005266 casting Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 abstract 4
- 239000007788 liquid Substances 0.000 description 6
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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
-
- 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
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
Definitions
- the invention relates to a method and a device for the continuous casting of slabs or blocks, in particular thin slabs in a continuous casting installation, comprising in a strand guide below the mold a soft reduction section with pressure rollers or support rollers, which are used individually or as a segment by means of hydraulics -Cylinders are infinitely variable against each other and can be limited by stops with a clamping force.
- the method and the corresponding device are mainly installed in the horizontal part of the strand guide of the continuous casting plants and serve to improve the structural quality and the surface quality of the cast product.
- the soft reduction effect is achieved by reducing the strand thickness in the area of its solidification with a molten core up to the tip of the liquid sump.
- the area in which the soft reduction has a significant influence on the internal strand quality lies in the solidification at FS: 0.3 to 0.8, corresponding to a length position on the solidification path.
- the soft reduction, the targeted reduction in thickness in the specified area demonstrably reduces the tendency towards segregation in the melt.
- the zone in which the strand thickness is reduced must be changeable in the longitudinal position of the strand.
- position-controlled clamping cylinders are used in the support segments.
- the invention has for its object to provide, starting from the aforementioned prior art, a method and an apparatus for the continuous casting of slabs or blocks, in particular thin slabs of the type mentioned in the preamble of claim 1, which is a highly effective soft reduction with reduced technical effort Allows for high quality results. '
- the method according to the invention is based on the knowledge gained from practical operation that a solidified part of the strand, if it comes into the area of soft reduction, must not be deformed, because otherwise the support rollers or pressure rollers or their bearings or the Scaffold structure of the segments would be damaged, especially if several segments form the soft reduction area and are conical.
- Such a case can occur, for example, if the casting speed changes or as a result of an interruption in operation.
- the clamping pressure for soft reduction, the hard pressure to soft printing with preferably 40% of the hard pressure at the outlet section of the strand.
- this changeover takes place automatically from hard printing to soft printing - and possibly vice versa - by determining a pressure rise pulse which arises in the clamping cylinders as a result of the non-deformable solidified strand entering the conically adjusted segment.
- One embodiment of the method provides that when the hard reduction of the soft reduction section is in operation, when the upper limit or switchover value is reached, the switch is made to soft print, and vice versa when the soft pressure is in the operating state when the lower pressure, limit or Switchover value is switched to hard printing.
- the method according to the invention is further developed in such a way that when a non-deformable, solidified strand part enters a segment that is conically set for hard printing, a changeover from hard printing to soft printing takes place due to the pressure rise impulse that occurs in the clamping cylinders.
- the clamping cylinders are primarily subjected to soft reduction pressure, the so-called hard pressure, each movement of the cylinder piston causing a change in pressure.
- a pressure sensor on the cylinder ensures that the pressure increase in the cylinder is used to switch to soft printing.
- a shut-off valve is partially opened by a relief valve, so that the segment in the hydraulic circuit can yield, that is to say that the segment mouth width can change and the solidified strand piece can pass the segment under soft pressure.
- an embodiment of the method according to the invention provides that after switching over a segment to an operating state with soft printing for a solidified strand part, in the case of the subsequent entry of a non-solidified strand part into the segment, a pressure query is started, with short, intermittent time intervals of Soft printing is switched to hard printing - and vice versa - and it is checked whether the pressures remain unchanged or whether they are above or below the respective limit or switchover value and that the setting for hard printing or soft printing is made depending on the pressure test. This measure prevents the segment from being opened too far by the ferrostatic pressure of the melt.
- a further embodiment of the method according to the invention provides that all support segments in the soft reduction area and in the segments behind them are subjected to the intermittent pressure query until the end of the machine. This ensures a uniform quality of the cast product.
- An expedient embodiment of the method provides that, in particular in the horizontal part of the continuous casting installation, a continuous section is determined in which the soft reduction conditions apply for the operating conditions of the casting operation and for the types of steel used.
- a continuous section is determined in which the soft reduction conditions apply for the operating conditions of the casting operation and for the types of steel used.
- special care must be taken to ensure that all support segments can be individually adjusted with the required taper in such a way that the continuous strand receives the deformation required for soft reduction.
- the method can provide that the hydraulically adjustable support segments against mechanical stops with a predetermined thickness are individually adjusted to a predetermined degree of soft reduction.
- the mechanical stops prevent the support rollers from moving too close together and thus damage the entire support structure.
- a device for the continuous casting of slabs or blocks, in particular thin slabs in a continuous casting installation comprising in a strand guide a soft-reduction section with pressure or support rollers which can be stepped individually or as a segment by means of hydraulic cylinders and can be limited by stops with one Clamping force can be applied, comprises a segment with support rollers or pressure rollers which can be pressed onto the strand and driven at an adjustable speed in a segment frame with upper frame part and lower frame part, as well as with hydraulic cylinders.
- a hydraulic circuit is provided with a pressure sensor and with the pressure changeover valve controllable by it, as well as with a shut-off valve arranged in its circuit, a control valve and a relief valve, and with a pipe rupture protection device, including a pressure relief device with a check valve.
- the device serves the purpose of applying a clamping force with hard pressure within a region of the soft reduction path that has not yet solidified or a clamping force with soft pressure within the region that has solidified of the soft reduction path, and to switch from hard pressure to soft pressure and vice versa.
- the clamping force is applied evenly into the pressure rollers by the hydraulic cylinders both via the upper frame part and via the lower frame part.
- Figure 1 shows a part of a support segment for the cast strand in a purely schematic representation, with an associated circuit diagram for performing the method according to the invention
- FIG. 2 shows a support segment in the open position for the entry of a strand with a partially liquid core in the area of the sump tip.
- FIG. 1 shows the part of a support segment 1 for the strand 2 cast in a continuous casting installation, for example a thin slab.
- the support segment is located within the soft reduction section of the strand guide and has pressure or support rollers 3, 4 which, individually or, as in the present case, as a segment, are continuously subjected to a clamping force by means of the hydraulic cylinder 7.
- Numeral 30 designates a mechanical stop of the intended thickness, against which the segment lower part 6 can be adjusted individually against the segment frame upper part 5 by pulling the piston rod of the cylinder 7 to the degree of soft reduction.
- the thickness of the cast thin slab is reduced in small increments to reduce segregation inside the strand and to improve the surface quality.
- the soft reduction section comprises at least large lengths of the strand with a molten core up to the tip of the liquid sump.
- a special hydraulic circuit is provided in order to adapt the position of the support segments to the position of the sump tip that changes as a result of different operating conditions.
- the working pressure of the hydraulic circuit above and below the piston in the hydraulic cylinder 7 is tapped and evaluated by the pressure sensor 10.
- This pressure sensor 10 on the cylinder 7 ensures that a pressure increase in the cylinder is used, for example, to switch from hard printing to soft printing.
- the pressure sensor 10 is connected to the pressure changeover valve 11 via signal lines.
- the clamping cylinders 7 are primarily subjected to the soft reduction pressure, ie hard pressure, and are equipped with a check valve 12, for example a pipe rupture safety device or an unlockable check valve in connection with an overpressure valve.
- Fuse 15 connected in such a way that every movement of the cylinder piston causes a pressure change which - as said - is used to switch to soft pressure in the event of an increase in pressure in the cylinder.
- the shut-off valve 12 is opened by the relief valve 14, so that the segment can yield, i.e. that the segment mouth width can change, as a result of which the solidified strand piece 2 can pass through the segment 1 under soft pressure.
- segment 1 If a non-solidified strand area with liquid sump arrives at another time in segment 1, segment 1, when applied with soft pressure, would yield under the ferrostatic pressure of strand 2 and open even more, which is not permitted and a reduction in quality of the Cast strand caused.
- a pressure query is started in the hydraulic circuit, in which the control valve 13 is switched from soft pressure to hard pressure via the pressure sensor 10 at short intervals and the unlockable Check valve 12 is closed.
- FIG. 2 shows a segment 1 for the entry of the strand 2 with strand shells 2 'not closed by a core 8 of liquid melt.
- Segment frame includes the segment frame upper part 5 and the segment frame I
- the segment 1 has the pressure guide rollers 2 and 4, which are partially provided with drives, for example, as is generally known.
- the hydraulic cylinders 7 ' are subjected to soft pressure and the hydraulic cylinders 7 to hard pressure in the sense of the invention.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10042079 | 2000-08-26 | ||
DE10042079A DE10042079A1 (de) | 2000-08-26 | 2000-08-26 | Stranggießanlage mit Soft-Reduction-Strecke |
PCT/EP2001/008574 WO2002018077A1 (de) | 2000-08-26 | 2001-07-25 | Stranggiessanlage mit soft-reduction-strecke |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1313579A1 true EP1313579A1 (de) | 2003-05-28 |
EP1313579B1 EP1313579B1 (de) | 2004-06-16 |
Family
ID=7653960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01969503A Expired - Lifetime EP1313579B1 (de) | 2000-08-26 | 2001-07-25 | Stranggiessanlage mit soft-reduction-strecke |
Country Status (12)
Country | Link |
---|---|
US (1) | US6871693B2 (de) |
EP (1) | EP1313579B1 (de) |
JP (1) | JP2004507363A (de) |
KR (1) | KR100796638B1 (de) |
CN (1) | CN1280042C (de) |
AT (1) | ATE269180T1 (de) |
AU (1) | AU2001289743A1 (de) |
CA (1) | CA2420604C (de) |
DE (2) | DE10042079A1 (de) |
ES (1) | ES2220803T3 (de) |
TR (1) | TR200401680T4 (de) |
WO (1) | WO2002018077A1 (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10236367A1 (de) | 2002-08-08 | 2004-02-19 | Sms Demag Ag | Verfahren und Vorrichtung zum dynamischen Anstellen von einen Giessstrang aus Metall, insbesondere aus Stahl, beidseitig stützenden und/oder führenden Rollensegmenten |
DE102004002783A1 (de) * | 2004-01-20 | 2005-08-04 | Sms Demag Ag | Verfahren und Einrichtung zum Bestimmen der Lage der Sumpfspitze im Gießstrang beim Stranggießen von flüssigen Metallen, insbesondere von flüssigen Stahlwerkstoffen |
CN100493772C (zh) * | 2005-07-28 | 2009-06-03 | 西安重型机械研究所 | 铸轧及动态轻压下用液压系统 |
DE102005055530A1 (de) * | 2005-11-22 | 2007-05-24 | Sms Demag Ag | Verfahren und Vorrichtung zum Anstellen von mindestens einem Rollensegment einer Strangführungseinrichtung an einen Strang |
DE102006048511A1 (de) * | 2006-10-13 | 2008-04-17 | Sms Demag Ag | Strangführungsvorrichtung und Verfahren für deren Betrieb |
DE102007016045A1 (de) * | 2007-03-30 | 2008-10-02 | Sms Demag Ag | Vorrichtung zum hydraulischen Anstellen von Bauteilen |
DE102008009136A1 (de) * | 2008-02-14 | 2009-10-15 | Sms Siemag Aktiengesellschaft | Strangführung, insbesondere für eine Stahlbrammen-Stranggießanlage |
DE102008025548A1 (de) * | 2008-05-28 | 2009-12-03 | Sms Siemag Aktiengesellschaft | Strangführung, insbesondere für eine Stahlbrammen-Stranggießanlage |
CN101920323B (zh) * | 2010-08-02 | 2013-05-08 | 河北钢铁股份有限公司邯郸分公司 | 基于压力反馈检测铸坯凝固液芯末端的动态轻压下方法 |
CN103894572B (zh) * | 2014-04-10 | 2016-09-07 | 北京科技大学 | 一种连铸坯预处理方法 |
US10076783B2 (en) | 2014-05-14 | 2018-09-18 | Nippon Steel & Sumitomo Metal Corporation | Method for continuous-casting slab |
CN104148387B (zh) * | 2014-07-11 | 2016-05-04 | 中冶东方工程技术有限公司 | 一种连铸热芯轧制方法 |
KR102410492B1 (ko) * | 2015-07-23 | 2022-06-20 | 삼성디스플레이 주식회사 | 글라스 성형 장치 |
CN109500370B (zh) * | 2018-11-12 | 2020-12-22 | 包头钢铁(集团)有限责任公司 | 一种宽厚板铸机压力控制动态轻压下的方法 |
CN112355262B (zh) * | 2020-11-09 | 2021-10-15 | 湖南工程学院 | 一种用于板坯连铸动态轻压下的控制装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63238965A (ja) * | 1987-03-26 | 1988-10-05 | Nkk Corp | 軽圧下鋳造方法 |
JPS63242452A (ja) * | 1987-03-30 | 1988-10-07 | Nkk Corp | 軽圧下鋳造方法 |
JPS63278655A (ja) * | 1987-05-12 | 1988-11-16 | Nkk Corp | 軽圧下鋳造方法 |
US5211217A (en) * | 1989-08-16 | 1993-05-18 | Diado Tokushuko Kabushiki Kaisha | Vertical continuous casting method and casting apparatus |
JPH04231104A (ja) * | 1990-12-28 | 1992-08-20 | Nippon Steel Corp | 未凝固圧延装置 |
EP0776708B1 (de) * | 1995-11-28 | 1999-01-20 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Verfahren und Vorrichtung zum geregelten Vorwalzen von aus einer Stranggiessanlage austretenden Dünnbramme |
DE19718886A1 (de) * | 1997-05-03 | 1998-11-05 | Bosch Gmbh Robert | Verfahren zur Herstellung von porösen Formkörpern |
DE19720768C1 (de) * | 1997-05-07 | 1999-01-14 | Mannesmann Ag | Verfahren und Vorrichtung zum Erzeugen von Brammen aus Stahl |
DE10007706A1 (de) * | 2000-02-19 | 2001-08-23 | Sms Demag Ag | Verfahren und Anlage zum Gießen von Vorprodukten in einer Stranggießanlage |
-
2000
- 2000-08-26 DE DE10042079A patent/DE10042079A1/de not_active Withdrawn
-
2001
- 2001-07-25 KR KR1020037002405A patent/KR100796638B1/ko not_active IP Right Cessation
- 2001-07-25 ES ES01969503T patent/ES2220803T3/es not_active Expired - Lifetime
- 2001-07-25 DE DE50102621T patent/DE50102621D1/de not_active Expired - Lifetime
- 2001-07-25 AU AU2001289743A patent/AU2001289743A1/en not_active Abandoned
- 2001-07-25 EP EP01969503A patent/EP1313579B1/de not_active Expired - Lifetime
- 2001-07-25 TR TR2004/01680T patent/TR200401680T4/ unknown
- 2001-07-25 US US10/362,252 patent/US6871693B2/en not_active Expired - Fee Related
- 2001-07-25 WO PCT/EP2001/008574 patent/WO2002018077A1/de active IP Right Grant
- 2001-07-25 AT AT01969503T patent/ATE269180T1/de not_active IP Right Cessation
- 2001-07-25 JP JP2002523037A patent/JP2004507363A/ja not_active Withdrawn
- 2001-07-25 CN CNB018147100A patent/CN1280042C/zh not_active Expired - Fee Related
- 2001-07-25 CA CA002420604A patent/CA2420604C/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0218077A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2420604A1 (en) | 2003-02-26 |
CN1449314A (zh) | 2003-10-15 |
DE50102621D1 (en) | 2004-07-22 |
ES2220803T3 (es) | 2004-12-16 |
CN1280042C (zh) | 2006-10-18 |
US6871693B2 (en) | 2005-03-29 |
JP2004507363A (ja) | 2004-03-11 |
WO2002018077A1 (de) | 2002-03-07 |
KR20030036708A (ko) | 2003-05-09 |
AU2001289743A1 (en) | 2002-03-13 |
TR200401680T4 (tr) | 2004-08-23 |
DE10042079A1 (de) | 2002-04-25 |
US20040026066A1 (en) | 2004-02-12 |
ATE269180T1 (de) | 2004-07-15 |
CA2420604C (en) | 2010-01-19 |
KR100796638B1 (ko) | 2008-01-22 |
EP1313579B1 (de) | 2004-06-16 |
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