EP0618023A1 - Procede de coulee d'une brame continue - Google Patents

Procede de coulee d'une brame continue Download PDF

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Publication number
EP0618023A1
EP0618023A1 EP92920028A EP92920028A EP0618023A1 EP 0618023 A1 EP0618023 A1 EP 0618023A1 EP 92920028 A EP92920028 A EP 92920028A EP 92920028 A EP92920028 A EP 92920028A EP 0618023 A1 EP0618023 A1 EP 0618023A1
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EP
European Patent Office
Prior art keywords
mold
casting
solidified shell
slab
time zone
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
Application number
EP92920028A
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German (de)
English (en)
Other versions
EP0618023B1 (fr
EP0618023A4 (fr
Inventor
Seiji; Technical Research Division Of Itoyama
Hirokazu; Technical Research Division Of Tozawa
Shuji; Technical Research Division Of Takeuchi
Kenichi; Technical Research Division Sorimachi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to AT92920028T priority Critical patent/ATE167416T1/de
Priority claimed from CA002098572A external-priority patent/CA2098572C/fr
Publication of EP0618023A1 publication Critical patent/EP0618023A1/fr
Publication of EP0618023A4 publication Critical patent/EP0618023A4/fr
Application granted granted Critical
Publication of EP0618023B1 publication Critical patent/EP0618023B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 present invention relates to a casting process for continuous castings, capable of obtaining the castings reduced in the depths of oscillation marks and suppressed in segregation at oscillation mark trough portions, in a continuous casting method, particularly, a vertical continuous casting method for metal.
  • the mechanism and cause of generating the segregations at oscillation mark trough portions were considered as follows: namely, the negative pressure is generated within a liquid phase lubricating film between the mold and the solidified shell due to oscillation of the mold;and due to this negative pressure, the non-solidified and concentrated molten steel between dendrites of the solidified surface layer permeates onto the surface of the shell.
  • An object of the present invention is to provide a process of withdrawing the continuous castings wherein, even in the low cycle condition that the oscillation frequency ⁇ f ⁇ of the mold is small, the segregations at oscillation mark trough portions on the surfaces of the castings are significantly reduced to the degree equivalent to that in the high cycle condition, and also the stable casting is made possible.
  • a casting process for continuous castings characterized by vertically oscillating a vertical continuous casting mold forming a casting space with two pairs of mold wall surfaces; and simultaneously repeating a series of actions composed of separating at least a pair of mold wall surfaces from a solidified shell at any period in each specified time zone within a positive strip time zone and a negative strip time zone, and of making the separated mold wall surfaces close to the solidified shell within the other time zones.
  • a casting process for continuous castings characterized by performing the casting under the condition of only a positive strip time zone, while vertically oscillating a vertical continuous casting mold forming a casting space with two pairs of mold wall surfaces; and repeating a series of actions composed of separating at least a pair of mold wall surfaces from a solidified shell at any period in each specified time zone within a mold ascending period and a mold descending period, and making the separated mold wall surfaces close to the solidified shell within the other time zones in the mold ascending period and the descending period
  • a distance between a mold wall 9 and a solidified shell 12 is increased from Xs to Xo, so that a mold powder 10 on a molten steel 11 is made to sufficiently flow in a gap between the mold wall 9 and the solidified shell 12 to thereby reduce the frictional force between the mold wall 9 and the solidified shell 12.
  • the arrow of Y indicates the direction of withdrawing the casting.
  • the mold walls are advanced to be close to the solidified shell, to be thus closed at the position of Xs. Namely, the distance X between the mold and the solidified shell is changed from Xo to Xs.
  • the effect describe above is not much dependent on the vertical oscillation waveform and a waveform for horizontally advancing/retarding (closing/opening) the mold walls (hereinafter, referred to as "horizontal oscillation"), and which is similarly effective in the cases of the non-sinusoidal wave or triangular wave other than the vertical oscillation of the sinusoidal wave and the horizontal wave of the trapezoidal wave as shown in Fig. 1.
  • the amplitude of the horizontal oscillation is preferably within the range of 1mm or less.
  • a horizontal oscillator generally used for a slab continuous casting machine has a mechanism of clamping mold short sides 2 with mold long sides 1 through short side clamping springs 3.
  • a hydraulic circuit for opening/closing a short side clamping hydraulic cylinder 4 so that the long sides 1 of the mold is moved by opening and closing the short side clamping hydraulic cylinder 4 through upper and lower solenoid valves 5 and 6 provided in a hydraulic circuit.
  • Numeral 7 indicates a hydraulic motor and numeral 8 is a hydraulic tank. If the gaps between the long sides and short sides of the mold are made excessively larger, molten steel permeates in the gaps, thereby causing the trouble. Accordingly, the retarded amount of the long sides of the mold is within the range of 1mm or less.
  • the casting of stainless steel was continuously cast using the above horizontal oscillator for horizontally oscillating the mold walls as shown in Fig. 3.
  • the segregation layer thickness (d2 -dl) at the oscillation mark portion was obtained.
  • the examination was made for the above segregation layer thickness (d2 -dl) and the segregation layer depth d2.
  • the examinations were made for the cases of generating only the vertical oscillation (sinusoidal wave) according to the conventional manner; and of generating such oscillating waves as shown in Figs.
  • Fig. 5(a) and 5(b) disclosed in Japanese Patent Laid-open No. Hei 2-290656.
  • Fig. 5(a) shows the case of moving the mold walls backward during the period when the oscillation of the mold lies in the negative strip time.
  • Fig. 5(b) shows the case of retarding the mold in the mold descending period.
  • the mold wall opening/closing timing is closed (at the position of Xs) for a period from 105 ° to 130 ° (from the time t2 to t3 in Fig. 1) in terms of angle conversion (zero angle, when V m is positively maximized), and a period from 240° to 275 ° (from the time t4 to t5 in Fig. 1), and is opened (at the position of Xo) for the other periods.
  • the moving velocity from the opening to the closing, or the closing to the opening was specified at 50mm/sec.
  • the mold power there was used a lubricant having a viscosity of 1.1 poise at 1300 ° C and the solidification temperature of 900° C.
  • T N 0 For the case of no negative strip time (T N 0), the test was carried out in the same manner as in Example 1, except that the amplitude S of the mold vertical oscillation was 2.0mm, and the horizontal opening and closing timing was closed in the period from 110 ° to 160 ° (from the time t1 to t2 in Fig. 2) and in a period from 250° to 290 ° (from the time t3 to t4 in Fig. 2), and was opened in the other periods.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Lorsqu'une brame est tirée pendant qu'un moule formé d'une longue paroi et d'une courte paroi est mis verticalement en vibration selon le procédé de coulée continue de type vertical, la longue paroi latérale est éloignée de la brame par un cylindre hydraulique (4) actionné au cours d'une période où une force de friction importante agit sur la brame. Par contre, au cours d'une période où une telle force n'agit pas sur la brame, la longue paroi latérale qui a été éloignée de la brame est rapprochée de celle-ci. De cette manière, le mouvement de la longue paroi latérale, l'éloignant et la rapprochant de manière répétée de la brame, permet de réduire la profondeur de la courbe d'oscillation, de sorte qu'une brame présentant une ségrégation inférieure, au niveau du creux de la courbe d'oscillation, peut être obtenue.
EP92920028A 1992-09-22 1992-09-22 Coulee continue de brames en lingotiere oscillee avec retrait horizontal des parois Expired - Lifetime EP0618023B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT92920028T ATE167416T1 (de) 1992-09-22 1992-09-22 Stranggiessen von brammen in oszillierender kokille mit horizontal zurückziebaren wänden

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002098572A CA2098572C (fr) 1992-09-22 1992-09-22 Procede de demoulage en coulee continue
PCT/JP1992/001205 WO1994006583A1 (fr) 1992-09-22 1992-09-22 Procede de coulee d'une brame continue

Publications (3)

Publication Number Publication Date
EP0618023A1 true EP0618023A1 (fr) 1994-10-05
EP0618023A4 EP0618023A4 (fr) 1996-10-23
EP0618023B1 EP0618023B1 (fr) 1998-06-17

Family

ID=4151802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92920028A Expired - Lifetime EP0618023B1 (fr) 1992-09-22 1992-09-22 Coulee continue de brames en lingotiere oscillee avec retrait horizontal des parois

Country Status (1)

Country Link
EP (1) EP0618023B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048960A1 (fr) * 1997-04-26 1998-11-05 Sms Schloemann-Siemag Aktiengesellschaft Methode de balancement d'une coquille de coulee continue
WO2000030783A1 (fr) * 1998-11-25 2000-06-02 Sms Schloemann-Siemag Aktiengesellschaft Procede pour faire osciller une lingotiere de coulee en continu selon des parametres d'oscillation variables
JP2014193475A (ja) * 2013-03-29 2014-10-09 Jfe Steel Corp 丸ビレットの連続鋳造方法
CN114367644A (zh) * 2021-12-15 2022-04-19 唐山渤海冶金智能装备有限公司 一种连铸结晶器振动轨迹曲线切换方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700024A (en) * 1969-10-16 1972-10-24 Concast Ag Method of continuously casting steel billets
WO1985004125A1 (fr) * 1984-03-19 1985-09-26 Amb Technology, Inc. Procede et appareil pour la coulee continue de metal
EP0372506A2 (fr) * 1988-12-08 1990-06-13 Kawasaki Steel Corporation Procédé pour l'oscillation d'une lingotière pour la coulée continue verticale
EP0570935A1 (fr) * 1992-05-21 1993-11-24 Kawasaki Steel Corporation Dispositif pour commander les oscillations du moule dans une lingotière de coulée continue

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700024A (en) * 1969-10-16 1972-10-24 Concast Ag Method of continuously casting steel billets
WO1985004125A1 (fr) * 1984-03-19 1985-09-26 Amb Technology, Inc. Procede et appareil pour la coulee continue de metal
EP0372506A2 (fr) * 1988-12-08 1990-06-13 Kawasaki Steel Corporation Procédé pour l'oscillation d'une lingotière pour la coulée continue verticale
EP0570935A1 (fr) * 1992-05-21 1993-11-24 Kawasaki Steel Corporation Dispositif pour commander les oscillations du moule dans une lingotière de coulée continue

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9406583A1 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048960A1 (fr) * 1997-04-26 1998-11-05 Sms Schloemann-Siemag Aktiengesellschaft Methode de balancement d'une coquille de coulee continue
CN1072049C (zh) * 1997-04-26 2001-10-03 Sms舒路曼-斯玛公司 使连铸结晶器振动的方法
US6363998B1 (en) * 1997-04-26 2002-04-02 Sms Schloemann-Siemag Aktiengesellschaft Method for swaying a continuous casting mold
WO2000030783A1 (fr) * 1998-11-25 2000-06-02 Sms Schloemann-Siemag Aktiengesellschaft Procede pour faire osciller une lingotiere de coulee en continu selon des parametres d'oscillation variables
JP2014193475A (ja) * 2013-03-29 2014-10-09 Jfe Steel Corp 丸ビレットの連続鋳造方法
CN114367644A (zh) * 2021-12-15 2022-04-19 唐山渤海冶金智能装备有限公司 一种连铸结晶器振动轨迹曲线切换方法
CN114367644B (zh) * 2021-12-15 2023-09-01 唐山渤海冶金智能装备有限公司 一种连铸结晶器振动轨迹曲线切换方法

Also Published As

Publication number Publication date
EP0618023B1 (fr) 1998-06-17
EP0618023A4 (fr) 1996-10-23

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