WO2000007756A1 - Verfahren und einrichtung zum giessen eines stranges aus flüssigem metall - Google Patents
Verfahren und einrichtung zum giessen eines stranges aus flüssigem metall Download PDFInfo
- Publication number
- WO2000007756A1 WO2000007756A1 PCT/DE1999/002273 DE9902273W WO0007756A1 WO 2000007756 A1 WO2000007756 A1 WO 2000007756A1 DE 9902273 W DE9902273 W DE 9902273W WO 0007756 A1 WO0007756 A1 WO 0007756A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- level
- mold
- casting
- strand
- liquid metal
- Prior art date
Links
- 238000005266 casting Methods 0.000 title claims abstract description 52
- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000013642 negative control Substances 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000013589 supplement Substances 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
Definitions
- the invention relates to a method and a device for casting a strand of liquid metal, which is poured into a mold and pulled out of the mold.
- a strand is poured from liquid metal using a mold and is pulled out of the mold.
- An essential factor for a good quality of action of the strand cast in this way is keeping the casting level constant, ie the level of liquid metal in the mold. It is known to regulate the mold level.
- the controller design is difficult because the parameters of the controlled system, ie the casting apparatus and the mold, are sometimes subject to strong fluctuations or disturbances affect the casting level.
- liquid metal flows through a dip tube with an outlet opening m.
- the inflow of liquid metal through the dip tube into the mold is influenced by a stopper.
- it is an object of the invention to provide a method and a device for casting a strand ofdoseigem Me ⁇ tall indicate by means of a mold, by means of which and by means of which the effect on the meniscus by ex bruche of deposits, eg at the plug or Area of the dip tube can be reduced.
- the object is achieved by a method according to claim 1, 2 or 3 and a device according to claim 8, 9 or 10.
- the casting level i.e. the level of the liquid metal in the mold is regulated to a predetermined casting level setpoint by means of a casting level regulator.
- the difference between the actual level and the target level is advantageously monitored and the level controller outputs a predetermined additional value if the difference between the actual level and the target level exceeds a tolerance threshold.
- the object is also achieved by pouring a mold for casting a strand of liquid metal and pulling it out of a mold as a strand, the casting level, ie the level of the liquid metal in the mold, being applied to a predetermined casting level by means of a level control Setpoint is regulated, and the difference between the actual level of the casting level and the level of the casting level is advantageously monitored.
- a predetermined additional value is added to the output of the mold level controller if the difference between the actual level of the mold level and the set level value exceeds a tolerance threshold. The sum of the additional value and the cisne ⁇ gem initial value of the mold level controller then forms the new output value of the mold level controller.
- the object is achieved particularly advantageously in that a mold is poured for casting a strand of liquid metal and is pulled out of the mold as a strand, the mold level, ie the level of the liquid metal m of the mold, using a mold level regulator with at least one integrator a predetermined set level is regulated, and the difference between the actual level and the set level is advantageously monitored.
- the output of the integrator of the mold level controller is replaced by a predetermined additional value if the difference between the actual level of the mold level and the set level value exceeds a tolerance threshold.
- Supplements in this sense mean that the output of the integrator is replaced by the additional value, or that the additional value is added to the integrator output in a particularly advantageous manner, the sum of the additional value and the previous output value of the integrator forming the new output value of the integrator.
- the tolerance threshold in particular as a function of the standard deviation, the difference between the actual level of the casting level and the desired level of the level or a quantity equivalent to the standard deviation, is adapted to the casting process. In this way it is possible to prevent mold level fluctuations by incorrectly recognizing an odor, even though there is no termination.
- the tolerance threshold is limited to a value between 0.02 and 0.1, between 0.04 and 0.1 and / or between 0.06 and 0.1. In this way, the stability of a method according to the invention is increased. Further advantages and details result from the following description of exemplary embodiments. In detail show:
- FIG. 4 shows an exemplary embodiment of an abort pre-control according to FIG. 2,
- FIG. 5 shows a particularly advantageous exemplary embodiment of an abort pre-control according to FIG. 3.
- liquid metal 13 in this case steel, is poured into a distributor tube 7.
- the liquid metal flows out of the distribution channel 7 via a dip tube 5 with an outlet opening 6 into the mold 3.
- a strand 1 is formed from the liquid metal and is pulled out of the mold 3 via rollers 4.
- Chill mold 3 is influenced by a stopper 8, which is moved by a mechanism 9, which has a support arm and a lifting rod.
- the lifting rod is in turn driven by a hydraulic cylinder 10, which is controlled or regulated via an automation device 12 depending on a hydraulic cylinder manipulated variable S.
- the position of the lifting rod and thus the stopper position h is measured by means of a position measuring device 15 and transmitted to the automation device 12.
- the arrangement has a mold level measuring device 11 which measures the mold level g, ie the level of liquid metal in the mold 3.
- the casting mirror measuring device 11, like the position measuring device 15 and the hydraulic cylinder 10, is connected in terms of data technology to the automation device 12.
- the automation device 12 regulates a casting level g.
- the strand 1 pulled out of the mold 3 has a bottom pointed, ie a liquid core 2, and a solidified shell 14.
- a mold level controller 20 and a stopper position controller 23 are provided to control the mold level g.
- the mold level controller 20 has a P-element 21 and an integrator 22.
- the casting level controller 20 determines a stopper position setpoint h * as a function of the difference between a casting level setpoint g * and the casting level g.
- the stopper position controller 23 determines a manipulated variable s for the lifting cylinder 10 as a function of a stopper position control difference ⁇ h.
- Stopper position control difference ⁇ h is the difference between stopper position setpoint h * and stopper position h.
- an abort pilot control 24 is provided.
- the abort pre-control determines an additional value c depending on the control deviation ⁇ g.
- the output of the integrator 22 is supplemented with the additional value c and reset in a sampling step if the negative control deviation - ⁇ g exceeds a certain tolerance value.
- the control deviation ⁇ g is the difference between the casting level setpoint g * and the casting level actual value g.
- the termination feedforward control 24 and the termination feedforward control 25 differ essentially in that the tolerance thresholds according to the termination feedforward control 25 are determined over a certain time window as a function of the standard deviation ⁇ of the control deviation ⁇ g.
- the standard deviation ⁇ is determined by means of the statistical block 26, which in the present exemplary embodiment is a standard deviation generator over a specific time window. However, it can be replaced by more complex statistical function blocks, as well as fuzzy logic or neural networks.
- FIG. 4 shows a simple exemplary embodiment of an abort pre-control 24 according to FIG. 2. This has a negator
- the abort pre-control has a tolerance value checker 31, a holding member 32 and a switch 33.
- the holding element 32 closes the switch 33 for one scanning step.
- the abort feedforward control 24 outputs an additional value c in this sampling scan. If the scan pre-control 24 outputs an additional value c, the output value of the integrator 22 m FIG 2 is supplemented by the additional value c and reset.
- the additional value c is composed of a plurality of staggered values d, c 2 , c 3 , as is shown in FIG. 5 by way of example.
- the particularly advantageous embodiment of the abort feedforward control 25 has a negator 30, holding members 32, tolerance value checkers 40, 41, 42, P members 43, 44, 45 with reinforcements KK 2 , K lr Limiter 46, 47, 48 and switches 49, 50 and 51 on.
- tolerance values are provided for the tolerance value checkers 40, 41, 42, which are advantageously adapted to the casting process.
- the standard deviation ⁇ is multiplied by a gain K 3 , K 2 , Ki by means of the P terms 43, 44, 45 and then limited by the limiters 46, 47, 48.
- the initial value of the limiters 46, 47, 48 is the tolerance value that is used in the tolerance value checker 40, 41, 42.
- the tolerance value checkers 40, 41, 42 it is checked whether the negative control deviation - ⁇ g exceeds this tolerance value. If one of the tolerance value checkers 40, 41, 42 determines that its tolerance value has been exceeded by the negative control deviation - ⁇ g, the corresponding holding element 32 closes the corresponding switch 49, 50, 51. According to the combination of closed switches 49, 50, 51, an additional value c spent. If an additional value c is present, the output of the integrator 22 in FIG. 3 is supplemented by the additional value c in this sampling step and reset.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/762,348 US6505676B1 (en) | 1998-08-05 | 1999-07-23 | Method and device for casting a strand of liquid metal |
AT99948676T ATE227182T1 (de) | 1998-08-05 | 1999-07-23 | Verfahren und einrichtung zum giessen eines stranges aus flüssigem metall |
DE59903333T DE59903333D1 (de) | 1998-08-05 | 1999-07-23 | Verfahren und einrichtung zum giessen eines stranges aus flüssigem metall |
EP99948676A EP1100639B1 (de) | 1998-08-05 | 1999-07-23 | Verfahren und einrichtung zum giessen eines stranges aus flüssigem metall |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19835421.5 | 1998-08-05 | ||
DE19835421A DE19835421C2 (de) | 1998-08-05 | 1998-08-05 | Verfahren und Einrichtung zum Gießen eines Stranges aus flüssigem Metall |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000007756A1 true WO2000007756A1 (de) | 2000-02-17 |
Family
ID=7876582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1999/002273 WO2000007756A1 (de) | 1998-08-05 | 1999-07-23 | Verfahren und einrichtung zum giessen eines stranges aus flüssigem metall |
Country Status (6)
Country | Link |
---|---|
US (1) | US6505676B1 (de) |
EP (1) | EP1100639B1 (de) |
KR (1) | KR100621266B1 (de) |
AT (1) | ATE227182T1 (de) |
DE (2) | DE19835421C2 (de) |
WO (1) | WO2000007756A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101837368B (zh) * | 2010-04-27 | 2012-02-01 | 新星化工冶金材料(深圳)有限公司 | 镁合金板的连续铸轧成型方法 |
CN101862819B (zh) * | 2010-06-18 | 2011-05-11 | 新星化工冶金材料(深圳)有限公司 | 自动调节液面高度的控制机构及其镁合金板连续铸轧系统 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04339552A (ja) * | 1991-05-16 | 1992-11-26 | Sumitomo Metal Ind Ltd | 連続鋳造機の溶鋼レベル制御方法 |
US5311924A (en) * | 1991-09-12 | 1994-05-17 | Kawasaki Steel Corporation | Molten metal level control method and device for continuous casting |
JPH07232252A (ja) * | 1993-12-27 | 1995-09-05 | Kawasaki Steel Corp | 連続鋳造におけるモールド内溶融金属レベル制御方法 |
JPH08243703A (ja) * | 1995-03-14 | 1996-09-24 | Kawasaki Steel Corp | 連続鋳造における湯面レベル制御方法 |
DE19633738A1 (de) * | 1996-08-22 | 1998-02-26 | Siemens Ag | Verfahren und Einrichtung zum Gießen eines Stranges aus flüssigem Material |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4597048A (en) * | 1983-09-07 | 1986-06-24 | United States Steel Corporation | Digital flow regulation of liquid-level control for a continuous casting mold |
EP0798061A4 (de) * | 1995-10-18 | 1999-06-30 | Sumitomo Metal Ind | Verfahren zur überwachung des schmelzniveaus in einer stranggiessanlage |
-
1998
- 1998-08-05 DE DE19835421A patent/DE19835421C2/de not_active Expired - Lifetime
-
1999
- 1999-07-23 WO PCT/DE1999/002273 patent/WO2000007756A1/de active IP Right Grant
- 1999-07-23 EP EP99948676A patent/EP1100639B1/de not_active Expired - Lifetime
- 1999-07-23 AT AT99948676T patent/ATE227182T1/de active
- 1999-07-23 KR KR1020017001537A patent/KR100621266B1/ko not_active IP Right Cessation
- 1999-07-23 US US09/762,348 patent/US6505676B1/en not_active Expired - Fee Related
- 1999-07-23 DE DE59903333T patent/DE59903333D1/de not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04339552A (ja) * | 1991-05-16 | 1992-11-26 | Sumitomo Metal Ind Ltd | 連続鋳造機の溶鋼レベル制御方法 |
US5311924A (en) * | 1991-09-12 | 1994-05-17 | Kawasaki Steel Corporation | Molten metal level control method and device for continuous casting |
JPH07232252A (ja) * | 1993-12-27 | 1995-09-05 | Kawasaki Steel Corp | 連続鋳造におけるモールド内溶融金属レベル制御方法 |
JPH08243703A (ja) * | 1995-03-14 | 1996-09-24 | Kawasaki Steel Corp | 連続鋳造における湯面レベル制御方法 |
DE19633738A1 (de) * | 1996-08-22 | 1998-02-26 | Siemens Ag | Verfahren und Einrichtung zum Gießen eines Stranges aus flüssigem Material |
Non-Patent Citations (4)
Title |
---|
NIEMANN M ET AL: "MODULAR AUFGEBAUTE GIESSSPIEGELREGELUNG FUER STRANGGIESSANLAGEN", STAHL UND EISEN,DE,VERLAG STAHLEISEN GMBH. DUSSELDORF, vol. 117, no. 9, pages 77-83, XP000703434, ISSN: 0340-4803 * |
PATENT ABSTRACTS OF JAPAN vol. 017, no. 191 (M - 1396) 14 April 1993 (1993-04-14) * |
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 01 31 January 1996 (1996-01-31) * |
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 01 31 January 1997 (1997-01-31) * |
Also Published As
Publication number | Publication date |
---|---|
DE19835421A1 (de) | 2000-02-24 |
DE19835421C2 (de) | 2001-11-15 |
US6505676B1 (en) | 2003-01-14 |
KR100621266B1 (ko) | 2006-09-13 |
ATE227182T1 (de) | 2002-11-15 |
EP1100639B1 (de) | 2002-11-06 |
KR20010053632A (ko) | 2001-06-25 |
DE59903333D1 (de) | 2002-12-12 |
EP1100639A1 (de) | 2001-05-23 |
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