EP0977642A1 - Verfahren zur erzeugung der oszillation einer stranggiesskokille - Google Patents
Verfahren zur erzeugung der oszillation einer stranggiesskokilleInfo
- Publication number
- EP0977642A1 EP0977642A1 EP98922773A EP98922773A EP0977642A1 EP 0977642 A1 EP0977642 A1 EP 0977642A1 EP 98922773 A EP98922773 A EP 98922773A EP 98922773 A EP98922773 A EP 98922773A EP 0977642 A1 EP0977642 A1 EP 0977642A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- vibrations
- oscillation
- casting
- frequency
- 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 24
- 238000009749 continuous casting Methods 0.000 title claims abstract description 17
- 230000010355 oscillation Effects 0.000 claims abstract description 38
- 238000005266 casting Methods 0.000 claims abstract description 23
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 239000000314 lubricant Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000002893 slag Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000035876 healing Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008092 positive 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
Definitions
- the invention relates to a method for producing the oscillation of a mold in a continuous casting installation, in particular using a hydraulically driven lifting device.
- Mold oscillation is an essential part of the continuous casting process of metals. It ensures the required lubricating effect of the lubricant, for example casting powder or oil, and thus prevents the strand from sticking to the mold walls.
- lubricant for example casting powder or oil
- slag has established itself as a lubricant in the mold. It is created by melting casting powder, which is applied to the bathroom mirror in such a way that it permanently covers it.
- the simplest technical solution which also characterizes the predominant state of the art, is to set a continuous casting mold into an oscillating movement with the aid of a motor-driven eccentric. This results in a sinusoidal form of oscillation of the mold, the frequency and amplitude of which is predetermined by the speed of the motor and the eccentricity of the eccentric.
- the proportion of time in an oscillation period T in which the overtaking process V mold > V c takes place during the downward movement of the mold is generally referred to as a negative strip and is:
- V mold - mold speed (m / sec)
- v n - casting speed (m / sec)
- This negative strip corresponds to the so-called healing time, called heal , during each oscillation period
- the negative strip, healing time, amplitude and frequency of the mold oscillation, as well as their combination tailored to the present operating case, are decisive for the quality of the cast product and are adjusted to the properties of the melt to be cast and the casting powder used. must be.
- the selection of the oscillation parameters is an essential component in the optimization of the continuous casting process and essentially consists in the selection of an optimal combination of amplitude and frequency, the negative strip being to be within certain limits, usually between 15 and 40%.
- DE 37 04 793 C2 describes a lifting device with two rotatably driven eccentric shafts articulated on a lifting table for the continuous casting mold or directly on this. At least one cardan shaft is used in the connection between the rotary drive and the eccentric shafts, which meets at least one of the following two conditions:
- the rod end facing away from the eccentric shaft is arranged such that it can be changed in position
- the rod ends are arranged such that they can be rotated relative to one another.
- a non-sinusoidal movement of the mold results from the conscious use of the gimbal error that occurs when a propeller shaft is not inserted in alignment between the shafts.
- By changing the height and lateral displacement of the rotary drive different non-sinusoidal movements of the mold can be realized.
- 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 oscillation generating device is operated according to a preselected oscillation amplitude signal generated by a function generator at a frequency which is higher than the natural frequency of the oscillation device.
- EP 0 618 023 AI discloses a process 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 their throat has less segregation.
- EP 0 618 023 AI also suggests a mold vibration without overtaking.
- the slag penetrates into the gap between the strand and the mold wall made possible by the alternate expansion and narrowing of the mold.
- An essential feature of the known sinusoidal and non-sinusoidal speed profiles is that the mold has an identical speed and path profile for each period, which corresponds to the time between two successive overtaking processes of the strand by the mold as it moves downward, at a predetermined oscillation frequency and amplitude .
- the invention is based on the object of oscillating the continuous casting mold. le, which differs from all previously used, with which it is possible to control the heat transfer in the mold and the shell formation, and thus the quality of the cast product, in comparison to a simple sinusoidal or non-sinusoidal vibration with comparable frequency and amplitude targeted improvement.
- the invention advantageously opens up a possibility of varying the vibration profile of a continuous casting mold within wide limits with regard to the shape of the vibration, frequency and amplitude and, for example, optimally setting the relationship between negative strip, healing time and frequency.
- One embodiment of the invention provides that with a series of successive mold vibrations, these periodically shift their zero line relative to the position of the bath level in the mold up and down.
- an oscillation component with a significantly lower frequency can be introduced into the “mold strand” system.
- the frequency, amplitude and shape of this vibration component it is possible due to the sufficient time to largely influence and control the melting behavior of the casting powder, the heat transfer in the area of the bath level and the formation of the strand shell, thus significantly improving the quality of the cast product and the Increase operational security.
- An embodiment of the method according to the invention provides that the mold oscillation is brought about by superimposing at least two mutually independent vibrations which differ by speed curve or frequency alone or in combination or additionally in combination with the amplitude.
- the frequency of at least two successive identical mold vibrations is lower than the frequency with which the mold overtakes the strand during its downward movement.
- the implementation of the method is advantageously facilitated in that the mold is mounted in a frame and this is arranged on the lifting table and that both the frame and the lifting table are in mutual relationship in order to generate superimposed vibrations with different speed profiles and / or frequencies and / or amplitudes independent vibrations are excitable.
- the method can be used at least during one and / or several casting sections of the casting process, as a result of which the heat transfer in the mold and the strand formation can be controlled extremely variably and the quality of the cast product can thus be specifically improved.
- FIG. 1 shows for a mold oscillation, which consists of the sequence of eight consecutive different oscillations, the course of the speed and the path of the mold, as well as the constant strand withdrawal speed.
- a mold oscillation which consists of the sequence of eight consecutive different oscillations, the course of the speed and the path of the mold, as well as the constant strand withdrawal speed.
- an oscillation frequency 360 strokes / min and an amplitude of + 3.2 mm
- an additional periodic shift of the zero line of the mold vibrations of + 0.8 mm is achieved by the time of the maximum speed of the mold as it moves down periodically in two consecutive Vibrations each reduced by ten 10 degrees and in the two subsequent vibrations each increased by 10 degrees.
- FIGS. 2 to 6 show examples of the almost unlimited variation possibilities of the resulting mold vibrations, which can be achieved by superimposing at least two mutually independent vibrations with different vibration parameters.
- the two upper fields each show two vibration parameters that are independent of one another, the courses in the right field having a triple frequency in comparison to the courses in the left field.
- FIG. 6 A further exemplary embodiment of oscillation curves according to the invention is shown in FIG. 6.
- the speed curve consists of straight sections.
- the advantage of this curve is that, in addition to the positive effects already mentioned on the quality of the cast product, it is determined by a significantly smaller number of determination points and the programming effort for the control algorithms is correspondingly less.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19717778 | 1997-04-26 | ||
DE19717778 | 1997-04-26 | ||
DE19742794 | 1997-09-27 | ||
DE19742794A DE19742794A1 (de) | 1997-04-26 | 1997-09-27 | Verfahren und Erzeugung der Oszillation einer Stranggießkokille |
PCT/EP1998/002434 WO1998048960A1 (de) | 1997-04-26 | 1998-04-24 | Verfahren zur erzeugung der oszillation einer stranggiesskokille |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0977642A1 true EP0977642A1 (de) | 2000-02-09 |
EP0977642B1 EP0977642B1 (de) | 2002-01-09 |
Family
ID=26036135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98922773A Expired - Lifetime EP0977642B1 (de) | 1997-04-26 | 1998-04-24 | Verfahren zur erzeugung der oszillation einer stranggiesskokille |
Country Status (7)
Country | Link |
---|---|
US (1) | US6363998B1 (de) |
EP (1) | EP0977642B1 (de) |
JP (1) | JP2001522312A (de) |
CN (1) | CN1072049C (de) |
AT (1) | ATE211663T1 (de) |
ES (1) | ES2173581T3 (de) |
WO (1) | WO1998048960A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008006189A1 (de) | 2008-01-26 | 2009-07-30 | Sms Demag Ag | Einrichtung und Verfahren zum Regeln von Kokillenoszillationen |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101337267B (zh) * | 2008-08-13 | 2010-06-09 | 中冶连铸技术工程股份有限公司 | 板坯结晶器液压振动装置 |
CN102688995B (zh) * | 2012-06-13 | 2013-12-11 | 鞍钢股份有限公司 | 一种连铸结晶器振动台参数控制方法 |
KR101594654B1 (ko) * | 2013-12-20 | 2016-02-16 | 주식회사 포스코 | 연주기용 주형 진동장치 |
EP3162462B1 (de) * | 2014-06-27 | 2020-03-04 | Nippon Steel Corporation | Verfahren für den betrieb einer stranggussmaschine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4460034A (en) * | 1980-12-23 | 1984-07-17 | Tsuyoshi Saeki | Mold for continuous casting |
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 |
DE3704793A1 (de) * | 1987-02-16 | 1988-08-25 | Thyssen Edelstahlwerke Ag | Hubvorrichtung an einer stranggusskokille |
CA1316325C (en) * | 1987-08-29 | 1993-04-20 | Masatsugu Uehara | Method of oscillating continuous casting mold at high frequencies and mold oscillated by such method |
EP0618023B1 (de) * | 1992-09-22 | 1998-06-17 | Kawasaki Steel Corporation | STRANGGIESSEN VON BRAMMEN IN OSZILLIERENDER KOKILLE MIT HORIZONTAL ZURüCKZIEBAREN WÄNDEN |
US5579824A (en) * | 1993-11-29 | 1996-12-03 | Kawasaki Steel Corporation | Continuous casting process with vertical mold oscillation |
-
1998
- 1998-04-24 EP EP98922773A patent/EP0977642B1/de not_active Expired - Lifetime
- 1998-04-24 JP JP54658998A patent/JP2001522312A/ja active Pending
- 1998-04-24 ES ES98922773T patent/ES2173581T3/es not_active Expired - Lifetime
- 1998-04-24 WO PCT/EP1998/002434 patent/WO1998048960A1/de not_active Application Discontinuation
- 1998-04-24 CN CN98804542A patent/CN1072049C/zh not_active Expired - Fee Related
- 1998-04-24 US US09/403,555 patent/US6363998B1/en not_active Expired - Fee Related
- 1998-04-24 AT AT98922773T patent/ATE211663T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9848960A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008006189A1 (de) | 2008-01-26 | 2009-07-30 | Sms Demag Ag | Einrichtung und Verfahren zum Regeln von Kokillenoszillationen |
Also Published As
Publication number | Publication date |
---|---|
JP2001522312A (ja) | 2001-11-13 |
ATE211663T1 (de) | 2002-01-15 |
EP0977642B1 (de) | 2002-01-09 |
US6363998B1 (en) | 2002-04-02 |
CN1072049C (zh) | 2001-10-03 |
WO1998048960A1 (de) | 1998-11-05 |
CN1253517A (zh) | 2000-05-17 |
ES2173581T3 (es) | 2002-10-16 |
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