EP1133370A1 - Verfahren zum oszillieren einer stranggiesskokille mittels variabler oszillationsparameter - Google Patents
Verfahren zum oszillieren einer stranggiesskokille mittels variabler oszillationsparameterInfo
- Publication number
- EP1133370A1 EP1133370A1 EP99958061A EP99958061A EP1133370A1 EP 1133370 A1 EP1133370 A1 EP 1133370A1 EP 99958061 A EP99958061 A EP 99958061A EP 99958061 A EP99958061 A EP 99958061A EP 1133370 A1 EP1133370 A1 EP 1133370A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oscillation
- frequency
- casting
- mold
- stroke
- 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
- 230000010355 oscillation Effects 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009749 continuous casting Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 54
- 230000001133 acceleration Effects 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 241000309551 Arthraxon hispidus Species 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005204 segregation Methods 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the moulds
-
- 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
- B22D11/166—Controlling or regulating processes or operations for mould oscillation
Definitions
- the invention relates to a method for oscillating a continuous casting mold by means of vertically reciprocating movements in the casting direction or in the opposite direction, the stroke and frequency of the oscillation being adjustable parameters in accordance with the casting speed and with the leading speed of the mold relative to the strand, the so-called negative strip, liquid and / or solid casting medium is drawn into the gap between the mold and the strand.
- the mold used for this is set in a periodic movement in order to generate a relative movement between the strand and the mold.
- granular to powdery casting powder on the bath surface is drawn into the gap between the mold and the crack as a lubricant, thus reducing the friction between the mold and the strand. This effect considerably reduces wear on the mold and prevents the strand from sticking to the mold wall.
- the periodic mold movement usually forms a sine oscillation in the course of the position and speed, which has a constant stroke, for example in the case of eccentric oscillators, and a period that is adapted to the casting speed.
- the type of friction changes as the mold slides past the strand:
- a negative strip When the mold's leading speed relative to the strand, referred to as a negative strip, and after its reversal of direction to the positive strip, there is sliding friction; There is static friction between the negative strip and positive strip in the area of reversal of direction.
- This alternating upsetting or stretching process of the strand shell causes an oscillating excitation of the entire strand. If this is in an unfavorable, for example harmonic, frequency range, this can cause the entire casting system to vibrate.
- the duration of the oscillation period becomes shorter with increasing casting speed. This proportionally increases the time in which liquid and solid casting medium to minimize friction in the gap between the mold and Strand can penetrate. This increases the closure of the mold and the risk that the strand sticks to the mold wall, which in the worst case can lead to a breakthrough. 2. Increased casting speeds lead to increased oscillation frequencies and thus to increased accelerations of the moving masses. In addition, the casting system is made to vibrate by the increased alternation of sliding friction and static friction as a result of a higher frequency.
- document DE 37 04 793 C2 describes a mold lifting device with two, rotatably drivable eccentric shafts that are articulated on a lifting table for the continuous casting mold or directly on it. At least one cardan shaft is used in the connection between the rotary drive and the eccentric shafts, in which the joint head facing away from the eccentric shaft is arranged such that it can be changed in position and the joint heads can be rotated relative to one another.
- a non-sinusoidal motion of the mold is created by the deliberate use of the gimbal error, which occurs when a propeller shaft is not inserted in alignment between the shafts.
- the gimbal error which occurs when a propeller shaft is not inserted in alignment between the shafts.
- Document EP 0 121 622 B1 describes a process for continuous casting using a mold mounted in a frame, which is set in vibration by an electro-hydraulic servo device.
- the device for generating vibrations is operated in accordance with a Tor generated preselected vibration amplitude signal operated at a frequency which is higher than the natural frequency of the vibration device.
- Document EP 0 618 023 A1 discloses a method for continuous casting, in which a mold with a comparatively long side wall and a comparatively narrow transverse wall is used. Simultaneously with the oscillation of the mold, the side walls of the mold are moved away from the cast strand by a small transverse amount with each oscillation in a time phase in which the difference between the mold speed and the strand withdrawal speed exceeds a predetermined value, while in the remaining time at approximately the same speed of Strand and mold the side walls are again placed closer to the cast strand.
- This alternating widening and narrowing of the mold is intended to reduce the tensile and compressive forces acting on the strand shell, so that the depth of the oscillation marks is reduced and the center of the strand has less segregation. In this case, the penetration of the slag into the gap between the strand and the mold is facilitated by the alternate expansion and narrowing of the mold.
- the negative strip, amplitude and frequency of the mold oscillation and their combination which is tailored to an operating case, are decisive for the quality of the cast product and must be adjusted to the properties of the melts to be cast and of the casting powder used.
- the selection of the oscillation parameters is essential for the optimization of the continuous casting process and consists in an optimal combination of amplitude and frequency, whereby the negative strip should be within certain limits, usually between 15 and 40%.
- the invention has for its object to provide a method of the type mentioned in the preamble of claim 1 which, while overcoming the disadvantages, difficulties and technical limits mentioned, in particular at higher casting or strand withdrawal speeds, the production of continuous casting products with optimal Quality enables, the acceleration of the masses of a continuous caster is reduced, the pulling forces on the oscillators are reduced, the negative strip time is kept at least constant as the casting speed increases and slag is evenly drawn in by setting a constant relative speed between the mold and the strand.
- the method according to the invention has the great advantage that, with the same casting speed, the acceleration of the entire moving system is reduced by lowering the frequency, or is kept approximately constant with increasing casting speed.
- the frequency reduction method with a dynamically adjusted oscillation stroke has the following advantageous effects for sine oscillations:
- the accelerations of the masses are reduced by up to 25%, which also significantly reduces the pulling forces on the oscillators.
- a resulting vibration of the system of the casting machine is prevented; the foundations and mechanical equipment are less stressed; the mold level in the mold is not excited by vibrations; the negative strip time is the same in percentage, but absolutely up to 30% longer.
- the casting medium is given a longer period of time to be drawn in and spread out in the caliber between the strand shell and the copper plate.
- a targeted variation of the absolute negative strip time is made possible; the negative strip time can be kept constant with increasing casting speed; a constant and even intake of slag is achieved by setting a constant relative speed between the mold and the strand; A uniform supply of slag lubricant is possible with increasing casting speeds by adjusting the stroke and frequency; overall, higher casting speeds can be achieved.
- Non-sinudial trapezoidal speed forms are characterized by an asymmetrical course, which is especially for fast pouring Casting machines is suitable and is slower in the downward movement in the casting direction than in the upward movement.
- Fig. 1 in the diagram over the casting speed plotted comparison curves for the course of frequency and amplitude a) the vibration parameters according to the prior art b) the vibration parameters according to the invention.
- Table I contains a numerical example for the vibration curves of the
- FIG. 1 two frequency curves rising at an acute angle are plotted against the casting speed.
- the one after the conventional Chen state of the art - marked by black rectangles - frequency curve shows a much steeper increase than a frequency curve drawn below it with dash-dotted lines, which is initially much flatter than the conventional frequency curve up to a break point and then changes into a constant curve.
- the assigned curves for the mold stroke or for the amplitude run unchanged in a straight line, while the curve for the mold stroke changed according to the invention, plotted against the casting speed, increases.
- FIG. 4 shows vibration curves with symmetrical or asymmetrical mold oscillation according to the invention.
- the stroke of 3.9 mm is approximately 25% greater than that of the corresponding curve in FIG. 3 (3.1 mm), and the acceleration is 4.0 m / s 2 , ie it is approximately 30 % less than in the corresponding vibration example of FIG. 3 (5.3 m / sec 2 ).
- negative strip time 34 ms negative strip:
- negative strip time '41 ms negative strip
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Confectionery (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19854329 | 1998-11-25 | ||
| DE19854329A DE19854329A1 (de) | 1998-11-25 | 1998-11-25 | Verfahren zum Oszillieren einer Stranggießkokille mittels variabler Oszillationsparameter |
| PCT/EP1999/008836 WO2000030783A1 (de) | 1998-11-25 | 1999-11-17 | Verfahren zum oszillieren einer stranggiesskokille mittels variabler oszillationsparameter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1133370A1 true EP1133370A1 (de) | 2001-09-19 |
| EP1133370B1 EP1133370B1 (de) | 2002-09-04 |
Family
ID=7888938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99958061A Expired - Lifetime EP1133370B1 (de) | 1998-11-25 | 1999-11-17 | Verfahren zum oszillieren einer stranggiesskokille mittels variabler oszillationsparameter |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1133370B1 (de) |
| KR (1) | KR100634049B1 (de) |
| AT (1) | ATE223268T1 (de) |
| DE (2) | DE19854329A1 (de) |
| ES (1) | ES2183628T3 (de) |
| MX (1) | MXPA01005160A (de) |
| WO (1) | WO2000030783A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101105905B1 (ko) * | 2004-12-27 | 2012-01-17 | 주식회사 포스코 | 스테인리스 304강의 연주주편 제조방법 |
| DE102017213647A1 (de) * | 2017-03-29 | 2018-10-04 | Sms Group Gmbh | Stranggießanlage und Verfahren zu deren Betrieb |
| DE102018215566A1 (de) | 2018-09-13 | 2020-03-19 | Sms Group Gmbh | Verfahren und Computerprogrammprodukt zum Betreiben einer Oszillationsvorrichtung sowie die entsprechende Oszillationsvorrichtung |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2002366B1 (de) * | 1970-01-14 | 1971-01-21 | Mannesmann Ag | Sinusfoermige Kokillenbewegung beim Stranggiessen |
| US4577277A (en) * | 1983-03-07 | 1986-03-18 | Kabushiki Kaisha Kobe Seiko Sho | Method and apparatus of continuous casting by the use of mold oscillating system |
| DE3343479C1 (de) * | 1983-12-01 | 1984-08-23 | Fried. Krupp Gmbh, 4300 Essen | Verfahren zum Oszillieren einer in sich starren Horizontal-Stranggiesskokille fuer Metalle,insbesondere Stahl |
| DE3704793A1 (de) * | 1987-02-16 | 1988-08-25 | Thyssen Edelstahlwerke Ag | Hubvorrichtung an einer stranggusskokille |
| DE58901200D1 (de) * | 1988-01-28 | 1992-05-27 | Clecim Sa | Verfahren und vorrichtung zum oszillieren einer stahlstranggiesskokille. |
| FR2689045B1 (fr) * | 1992-03-31 | 1994-06-24 | Clecim Sa | Procede de coulee continue. |
| EP0618023B1 (de) * | 1992-09-22 | 1998-06-17 | Kawasaki Steel Corporation | STRANGGIESSEN VON BRAMMEN IN OSZILLIERENDER KOKILLE MIT HORIZONTAL ZURüCKZIEBAREN WÄNDEN |
-
1998
- 1998-11-25 DE DE19854329A patent/DE19854329A1/de not_active Withdrawn
-
1999
- 1999-11-17 DE DE59902597T patent/DE59902597D1/de not_active Expired - Lifetime
- 1999-11-17 KR KR1020017006319A patent/KR100634049B1/ko not_active Expired - Fee Related
- 1999-11-17 AT AT99958061T patent/ATE223268T1/de active
- 1999-11-17 EP EP99958061A patent/EP1133370B1/de not_active Expired - Lifetime
- 1999-11-17 ES ES99958061T patent/ES2183628T3/es not_active Expired - Lifetime
- 1999-11-17 MX MXPA01005160A patent/MXPA01005160A/es not_active IP Right Cessation
- 1999-11-17 WO PCT/EP1999/008836 patent/WO2000030783A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0030783A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59902597D1 (de) | 2002-10-10 |
| ES2183628T3 (es) | 2003-03-16 |
| MXPA01005160A (es) | 2005-06-20 |
| ATE223268T1 (de) | 2002-09-15 |
| EP1133370B1 (de) | 2002-09-04 |
| KR100634049B1 (ko) | 2006-10-16 |
| DE19854329A1 (de) | 2000-05-31 |
| WO2000030783A1 (de) | 2000-06-02 |
| KR20010080508A (ko) | 2001-08-22 |
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