CH449859A - Method for localizing the solidification front during the casting of metals, in particular during continuous casting - Google Patents
Method for localizing the solidification front during the casting of metals, in particular during continuous castingInfo
- Publication number
- CH449859A CH449859A CH1629566A CH1629566A CH449859A CH 449859 A CH449859 A CH 449859A CH 1629566 A CH1629566 A CH 1629566A CH 1629566 A CH1629566 A CH 1629566A CH 449859 A CH449859 A CH 449859A
- Authority
- CH
- Switzerland
- Prior art keywords
- casting
- solidification front
- metals
- localizing
- continuous casting
- Prior art date
Links
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
- B22D11/207—Controlling or regulating processes or operations for removing cast stock responsive to thickness of solidified shell
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
Verfahren zur Lokalisierung der Erstarrungsfront beim Giessen von Metallen, insbesondere beim Stranggiessen Die vorliegende Erfindung betrifft ein Verfahren zur Lokalisierung der Erstarrungsfront beim Giessen von Metallen, insbesondere beim Stranggiessen, wobei der Ort der Erstarrungsfront mit dem Ultraschall-Echo- Verfahren festgestellt wird.
Es ist bekannt, die Erstarrungsfront bzw. die Pha sengrenze festflüssig beim Stranggiessen mit Hilfe des Ultraschall-Impuls-Echo-Verfahrens zu lokalisieren. Da die Erstarrungsfront der Metalle je nach Erstarrungs- bedingungen meist nicht eben verläuft, beispielsweise infolge Dendritenwachstums, breiiger Erstarrung, irr homogenen Wärmeentzugs, usw., wird die reflektierende Wirkung der Phasengrenze für die Ultraschallwellen be deutend herabgesetzt.
Dadurch wird die Echoamplitude von der Erstarrungsfront kleiner als der Störpegel des Schallkopfes und die Phasengrenze kann somit nicht lo kalisiert werden. Dieser Zustand tritt ein, wenn die Un ebenheiten grösser als ein Zehntel der Schallwellenlänge sind. Beispielsweise ist die Schallwellenlänge bei Stahl etwa 5 mm bei Erstarrungstemperatur. Die Schallwellen länge kann aber nicht beliebig verkürzt werden, da die dazu notwendige Frequenzerhöhung eine höhere Dämp fung hervorruft.
Aufgabe der vorliegenden Erfindung ist es, den Re flexionsgrad der Schallwellen an der Erstarrungsfront zu erhöhen.
Diese Aufgabe wird dadurch gelöst, dass die Schmelze am Messort bewegt wird. Dadurch werden z. B. die in die Schmelze hineinragenden Dendriten ab gebrochen und die Zone der breiigen Erstarrung ver kleinert. Ebenso werden die durch irrhomogenen Wärme entzug bedingten Unebenheiten ausgeglichen.
Um dieses Verfahren auszuüben, kann am Mess- ort mit bekannten Mitteln, beispielsweise elektroma- gnetischen Rührspulen, ein Drehfeld erzeugt werden, wobei durch die magnetische Koppelung mit der Metall schmelze eine Strömung an der Erstarrungsfront erzeugt wird.
Mit Hilfe der Figur wird ein Beispiel der Einrich tung zur Durchführung des Verfahrens beschrieben. 1 stellt einen auf bekannte Art erzeugten Strang dar mit einer im Innern befindlichen Schmelze 2. Mit 3 ist die Erstarrungsfront bezeichnet. Mit Hilfe einer ein elektro magnetisches Drehfeld erzeugenden Spule 4 wird der Schmelze 2 eine Drehbewegung erteilt. Oberhalb der Spule 4 befindet sich ein Ultraschall-Echo-Gerät 5, wel ches auf bereits bekannte Weise den Ort der Erstar rungsfront misst.
Bei niedrigschmelzenden Metallen kann die Schmelze auch auf bekannte Weise mechanisch gerührt werden. Das beschriebene Verfahren kann aber nicht nur beim Stranggiessen, sondern beispielsweise auch beim Blockgiessen von Metallen, angewendet werden.
Method for localizing the solidification front when casting metals, in particular in continuous casting. The present invention relates to a method for localizing the solidification front when casting metals, in particular in continuous casting, the location of the solidification front being determined using the ultrasonic echo method.
It is known to localize the solidification front or the phase limit in solid form during continuous casting with the aid of the ultrasonic pulse-echo method. Since the solidification front of the metals is usually not flat, depending on the solidification conditions, for example due to dendrite growth, pulpy solidification, irrationally homogeneous heat extraction, etc., the reflecting effect of the phase boundary for the ultrasonic waves is significantly reduced.
As a result, the echo amplitude from the solidification front is smaller than the interference level of the transducer and the phase boundary can therefore not be calized. This condition occurs when the unevenness is greater than a tenth of the sound wavelength. For example, the sound wavelength for steel is about 5 mm at the solidification temperature. The sound wave length cannot, however, be shortened at will, since the frequency increase required for this causes greater attenuation.
The object of the present invention is to increase the degree of reflection of the sound waves at the solidification front.
This task is achieved in that the melt is moved at the measuring location. This z. B. the protruding into the melt dendrites broken off and ver smaller the zone of pulpy solidification. The unevenness caused by irregular heat extraction is also compensated.
In order to carry out this method, a rotating field can be generated at the measuring location with known means, for example electromagnetic stirring coils, with a flow being generated at the solidification front through the magnetic coupling with the metal melt.
With the aid of the figure, an example of the device for implementing the method is described. 1 shows a strand produced in a known manner with a melt 2 located in the interior. 3 denotes the solidification front. With the aid of a coil 4 generating an electromagnetic rotating field, the melt 2 is given a rotary movement. Above the coil 4 there is an ultrasonic echo device 5, which measures the location of the solidification front in an already known manner.
In the case of low-melting metals, the melt can also be mechanically stirred in a known manner. However, the method described can be used not only in continuous casting, but also, for example, in ingot casting of metals.
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1629566A CH449859A (en) | 1966-11-11 | 1966-11-11 | Method for localizing the solidification front during the casting of metals, in particular during continuous casting |
| AT999467A AT275774B (en) | 1966-11-11 | 1967-11-06 | Method for improving the localization of the solidification front when casting metals, especially in continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1629566A CH449859A (en) | 1966-11-11 | 1966-11-11 | Method for localizing the solidification front during the casting of metals, in particular during continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH449859A true CH449859A (en) | 1968-01-15 |
Family
ID=4416071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH1629566A CH449859A (en) | 1966-11-11 | 1966-11-11 | Method for localizing the solidification front during the casting of metals, in particular during continuous casting |
Country Status (2)
| Country | Link |
|---|---|
| AT (1) | AT275774B (en) |
| CH (1) | CH449859A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3952791A (en) * | 1974-01-08 | 1976-04-27 | Nippon Steel Corporation | Method of continuous casting using linear magnetic field for core agitation |
| US3981345A (en) * | 1973-05-21 | 1976-09-21 | Institut De Recherches De La Siderurgie Francaise (Irsid) | Method to improve the structure of cast metal during continuous casting thereof |
-
1966
- 1966-11-11 CH CH1629566A patent/CH449859A/en unknown
-
1967
- 1967-11-06 AT AT999467A patent/AT275774B/en active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3981345A (en) * | 1973-05-21 | 1976-09-21 | Institut De Recherches De La Siderurgie Francaise (Irsid) | Method to improve the structure of cast metal during continuous casting thereof |
| US3952791A (en) * | 1974-01-08 | 1976-04-27 | Nippon Steel Corporation | Method of continuous casting using linear magnetic field for core agitation |
Also Published As
| Publication number | Publication date |
|---|---|
| AT275774B (en) | 1969-11-10 |
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