EP0542024A1 - Procédé de la coulée de métaux liquides dans une machine de coulée continu - Google Patents
Procédé de la coulée de métaux liquides dans une machine de coulée continu Download PDFInfo
- Publication number
- EP0542024A1 EP0542024A1 EP92118311A EP92118311A EP0542024A1 EP 0542024 A1 EP0542024 A1 EP 0542024A1 EP 92118311 A EP92118311 A EP 92118311A EP 92118311 A EP92118311 A EP 92118311A EP 0542024 A1 EP0542024 A1 EP 0542024A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- strand
- wall
- casting
- elongation
- 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
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000009749 continuous casting Methods 0.000 title claims abstract description 9
- 239000002184 metal Substances 0.000 title claims description 3
- 229910052751 metal Inorganic materials 0.000 title claims description 3
- 238000005266 casting Methods 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims 2
- 238000005058 metal casting Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- 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
Definitions
- liquid steel is poured from a distributor into a water-cooled mold, usually a copper mold.
- a water-cooled mold usually a copper mold.
- the mold is moved in the strand pulling direction at a frequency of about 1 to 3 Hertz.
- a lubricating film is normally maintained between the steel and the inside of the mold wall. Due to the cooling of the steel through the mold walls, a steel strand with solidified strand shells and a still liquid core is formed.
- the steel strand which has been partially solidified in this way is pulled out of the mold by means of suitable pull-out means, it being supported and guided by rollers arranged below the mold.
- the invention is based on a method for casting metals in a continuous casting installation, the strand being continuously withdrawn from the mold and the casting process being controlled as a function of the stresses which occur in the continuous casting installation when the strand is extracted.
- the object of the invention is to provide measures in such a method with which breaks in the strand can be avoided in a simple manner.
- the solution to this problem in the aforementioned method is that during the continuous strand withdrawal, the expansion of the inner wall of the mold caused by the occurrence of mechanical forces in the strand withdrawal direction is measured, and the measurement values obtained are used to control the casting process in such a way that when exceeded the casting speed is reduced or the casting process is interrupted.
- the method according to the invention is based on the knowledge that, in the event of pull-out forces acting on the strand, in the event of caking (adhesive), there is a short-term expansion of the mold wall which is in the elastic range.
- This short-term expansion which is overlaid by the general thermal expansion of the mold wall, is an excellent signal for the occurrence of a breakthrough in the mold.
- this signal is generated without a time delay, so that the Measures of reducing the casting speed or even stopping the casting process can be taken early enough to prevent the liquid metal from flowing out.
- the method according to the invention can also be used to distinguish between light and heavy caking.
- slight caking it is sufficient if the casting speed is reduced in such a way that the remaining time in the mold is sufficient to allow a new, stable and solidified strand shell to be formed at the breakthrough point due to the continuous cooling. Then the casting speed can be increased slowly and continuously.
- heavy caking on the other hand, the casting process must be interrupted immediately, because with such caking the time remaining in the mold is not sufficient to heal the breakthrough.
- the strain measurement can in principle be carried out at any point on each mold wall. However, it has turned out that it is beneficial not to close to the corners of the mold, because there the stretch of the mold wall is the least due to the great rigidity of the construction. It is therefore advantageous if the points lie in the middle area of the mold walls. You should get at least one from the corners of the mold
- One third of the width of the side wall in question preferably should be in the middle of the walls.
- the strain measurement is carried out directly on the strand-side parts of the mold walls by means of suitable sensors, in particular strain gauges, this means a not inconsiderable effort, in particular because of the supply lines to the sensors and lines arranged in the interior of the water tank.
- the strain measurement is carried out on the outer wall of the water box remote from the strand when the water box forms a rigid unit with the mold inner wall.
- strain gauges 2a, 2b On the back of the broad side wall 1 shown in FIG. 1 there are two strain gauges 2a, 2b in the center, one of which is a strain gauge 2a in the strand pull-out direction and the other strain gauge 2b is arranged transversely thereto.
- These strain gauges 2a, 2b form a bridge circuit with two resistors R3, R4, in the diagonal of which an amplifier 3 is arranged, which supplies an output signal.
- the bridge circuit fed by a voltage source 4 is designed such that the amplifier 3 delivers no or a small output signal if the resistance values of the strain gauges 2a, 2b are the same. This is always the case if, due to the lack of caking on the mold wall and effective extraction forces, only thermal expansion occurs.
- the bridge circuit is detuned by the fact that the resistance value for the strain gauge 2a increases.
- the amplifier 3 delivers a suddenly increasing output signal, as is shown in the expansion time diagram of FIG. 3 for the time between 140 and 150 seconds. This suddenly rising output signal is evaluated in an evaluation circuit. Depending on this evaluation, the casting process is either slowed down or interrupted.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4137588A DE4137588C2 (de) | 1991-11-15 | 1991-11-15 | Verfahren zum Gießen von Metallen in einer Stranggießanlage |
| DE4137588 | 1991-11-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0542024A1 true EP0542024A1 (fr) | 1993-05-19 |
| EP0542024B1 EP0542024B1 (fr) | 1997-01-02 |
Family
ID=6444874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92118311A Expired - Lifetime EP0542024B1 (fr) | 1991-11-15 | 1992-10-27 | Procédé de la coulée de métaux liquides dans une machine de coulée continu |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5482106A (fr) |
| EP (1) | EP0542024B1 (fr) |
| CA (1) | CA2082887A1 (fr) |
| DE (2) | DE4137588C2 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004082869A1 (fr) * | 2003-03-22 | 2004-09-30 | Sms Demag Aktiengesellschaft | Procede pour determiner les temperatures de mesure dans des coquilles pour la coulee continue et coquille elle-meme |
| RU2448804C1 (ru) * | 2008-06-25 | 2012-04-27 | Смс Зимаг Аг | Кристаллизатор для разливки металла |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19843033B4 (de) * | 1998-09-19 | 2017-11-09 | Sms Group Gmbh | Durchbrucherkennungsverfahren für eine Stranggießkokille |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2501868C3 (de) * | 1975-01-15 | 1978-08-03 | Mannesmann Ag, 4000 Duesseldorf | Verfahren zur Regelung und Überwachung des Stranggießens von Stahl |
| DE2923900C2 (de) * | 1979-06-13 | 1984-09-13 | Hoesch Werke Ag, 4600 Dortmund | Verfahren zum Verhindern von Durchbrüchen des Strangs in Stranggießanlagen |
| US4774998A (en) * | 1985-02-01 | 1988-10-04 | Nippon Steel Corporation | Method and apparatus for preventing cast defects in continuous casting plant |
| EP0389139A2 (fr) * | 1989-03-20 | 1990-09-26 | Inland Steel Company | Découverte de rupture en coulée continue |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5362733A (en) * | 1976-11-18 | 1978-06-05 | Nippon Steel Corp | Horizontal continuous casting method |
| DE3037048A1 (de) * | 1980-10-01 | 1982-04-29 | Böhler AG, 4000 Düsseldorf | Verfahren zur steuerung des strangabzuges |
| US4615375A (en) * | 1983-04-18 | 1986-10-07 | United States Steel Corporation | Continuous casting mold friction monitor |
| DE3541445A1 (de) * | 1985-11-23 | 1987-06-04 | Mannesmann Ag | Stranggiesskokille mit temperaturmesseinrichtungen |
| JPS62286655A (ja) * | 1986-06-05 | 1987-12-12 | Nippon Kokan Kk <Nkk> | 鋳造異常判定装置 |
| JPH02247054A (ja) * | 1989-03-20 | 1990-10-02 | Sumitomo Metal Ind Ltd | 連続鋳造におけるパウダ流入異常検出方法 |
-
1991
- 1991-11-15 DE DE4137588A patent/DE4137588C2/de not_active Expired - Fee Related
-
1992
- 1992-10-27 DE DE59207803T patent/DE59207803D1/de not_active Expired - Fee Related
- 1992-10-27 EP EP92118311A patent/EP0542024B1/fr not_active Expired - Lifetime
- 1992-11-13 CA CA002082887A patent/CA2082887A1/fr not_active Abandoned
-
1994
- 1994-08-06 US US08/286,986 patent/US5482106A/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2501868C3 (de) * | 1975-01-15 | 1978-08-03 | Mannesmann Ag, 4000 Duesseldorf | Verfahren zur Regelung und Überwachung des Stranggießens von Stahl |
| DE2923900C2 (de) * | 1979-06-13 | 1984-09-13 | Hoesch Werke Ag, 4600 Dortmund | Verfahren zum Verhindern von Durchbrüchen des Strangs in Stranggießanlagen |
| US4774998A (en) * | 1985-02-01 | 1988-10-04 | Nippon Steel Corporation | Method and apparatus for preventing cast defects in continuous casting plant |
| EP0389139A2 (fr) * | 1989-03-20 | 1990-09-26 | Inland Steel Company | Découverte de rupture en coulée continue |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004082869A1 (fr) * | 2003-03-22 | 2004-09-30 | Sms Demag Aktiengesellschaft | Procede pour determiner les temperatures de mesure dans des coquilles pour la coulee continue et coquille elle-meme |
| RU2448804C1 (ru) * | 2008-06-25 | 2012-04-27 | Смс Зимаг Аг | Кристаллизатор для разливки металла |
Also Published As
| Publication number | Publication date |
|---|---|
| US5482106A (en) | 1996-01-09 |
| DE59207803D1 (de) | 1997-02-13 |
| CA2082887A1 (fr) | 1993-05-16 |
| DE4137588A1 (de) | 1993-05-19 |
| DE4137588C2 (de) | 1994-10-06 |
| EP0542024B1 (fr) | 1997-01-02 |
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