EP0363702A1 - Apparatus for continuous casting of metal strip - Google Patents
Apparatus for continuous casting of metal strip Download PDFInfo
- Publication number
- EP0363702A1 EP0363702A1 EP89117471A EP89117471A EP0363702A1 EP 0363702 A1 EP0363702 A1 EP 0363702A1 EP 89117471 A EP89117471 A EP 89117471A EP 89117471 A EP89117471 A EP 89117471A EP 0363702 A1 EP0363702 A1 EP 0363702A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molten metal
- dams
- pair
- pool
- rolls
- 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
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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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
Definitions
- the present invention relates to an improvement in a twin roll continuous casting apparatus for continuously casting a metal strip directly from a molten metal such as a molten steel.
- twin roll continuous casting apparatus in which a pair of internally cooled rolls having respectively horizontal axes and rotating in opposite direction to each other are disposed parallel to each other with an appropriate gap therebetween, a pool of molten metal is formed on the circumferential surfaces (the upper halves cylindrical surfaces in the axial directions) of the rolls above the gap and the molten metal is continuously cast into a metal strip through the gap while being cooled by the circumferential surfaces of the rotating rolls.
- twin roll continuous apparatus applied to a case of continuous casting of steel to produce a steel strip directly from molten steel.
- a pair of front and rear dams (referred to herein as “longitudinal dams") having their surfaces along the roll axes may be erected orthogonally to the side dams on the circumferential surfaces of the rolls so as to form a box-like pool for molten metal with the side dams and the longitudinal dams.
- the box-like pool serves to prevent waves of molten metal in the pool from directly hitting the surfaces of the rolls, thereby preventing formation of wrinkles (called “molten metal wrinkles”) on the surfaces of the cast strip.
- the molten metal stagnates at those corners of the pool, which are formed by the inside walls of the longitudinal dams and the surfaces of the rolls, where it is liable to be solidified forming so-called triple point shells on lower edges of the longitudinal dams, since it is cooled by both the longitudinal dams and rolls.
- the triple point shells grow to a certain size, they drop from the longitudinal dams and are incorporated in surfaces of the strip being cast, causing defects of the product.
- An object of the invention is to provide an improved twin roll continuous casting apparatus having a pair of longitudinal dams, which is capable of preventing formation of triple point shells and avoiding adverse affects of waves of molten metal, thereby ensuring a stable production of a strip of good quality.
- An apparatus for continuously casting a metal strip according to the invention comprises a pair of internally cooled rolls rotating in the opposite direction to each other and disposed parallel to each other with their axes held horizontal, and pairs of side dams and longitudinal dams for forming a pool of molten metal on the circumferential surfaces of the pair of rolls, said pair of side dams being disposed opposite to each other in a direction perpendicular to the roll axes with a space therebetween approximately corresponding to the width of a metal strip to be cast, said pair of longitudinal dams being disposed opposite to each other in a direction parallel to the roll axes, thereby continuously casting molten metal in the pool into a metal strip through a gap between the pair of rolls, wherein said pair of longitudinal dams are disposed with their bottom surfaces held slightly above the roll surfaces so that openings are formed between the bottom surfaces of the longitudinal dams and the roll surfaces and that during stationary running of the apparatus the openings are positioned at a
- the apparatus according to the invention further comprises a pouring device having an exhaling slit on the bottom for supplying molten metal through the slit to the pool which is disposed above the pool so that the slit is positioned above the surface of molten metal in the pool and extends parallel to the gap of rolls.
- a pouring device having an exhaling slit on the bottom for supplying molten metal through the slit to the pool which is disposed above the pool so that the slit is positioned above the surface of molten metal in the pool and extends parallel to the gap of rolls.
- reference numerals 1a, 1b designate a pair of internally cooled rolls rotating in the opposite direction to each other (the rotational directions of both rolls are shown by ar rows) and opposed parallel to each other with their roll axes held horizontal.
- Reference numerals 2a, 2b designate side dams slidably contacting respective side surfaces of the rolls, and 3a, 3b longitudinal dams disposed in parallel to the roll axes and perpendicularly to the side dams.
- the bottom surfaces of the longitudinal dams and the surfaces of the rolls are substantially parallel to each other respectively with respective openings between them as described hereinafter in detail.
- Fig. 1 depicts an example of the apparatus according to the invention, which is provided with a pouring device 4 for supplying molten metal to the pool defined by the longitudinal and side dams and the surfaces of the rolls.
- Reference numeral 5 designates a surface level of molten metal in the pool, 6 a parent nozzle for supplying molten metal to the pouring device, and 7 a strip being cast.
- Fig. 2 is a cross-sectional view of the apparatus of Fig. 1 taken along a plane perpendicular to the roll axes at the center of the rolls, showing the state of casting.
- the pouring device is an intermediate vessel having an exhaling slit 8 on the bottom for supplying molten metal through the slit 8 to the pool, and is disposed above the pool so that the slit 8 is positioned above the surface 5 of molten metal in the pool and extends parallel to the gap of rolls.
- the pouring device is located in position so that the direction in which the slit 8 extends is substantially in a plane which contains the narrowest gap 9 of the rolls 1a, 1b and is perpendicular to the surface 5 of molten metal.
- the length of the slit 8 is preferably as close as possible to the length of the longitudinal dams (the distance between the side dams).
- molten metal is continuously supplied through the parent nozzle 6 to the pouring device 4 at an appropriate rate to form a film flow of molten metal parallel to the inside surfaces of the longitudinal dams 3a, 3b, which falls through the slit 8 of the pouring device 4 in the pool at the central portion of the longitudinal dams (the position corresponding to the narrowest gap between the rolls 1a, 1b), thereby producing the strip 7 while maintaining the surface 5 of molten metal in the pool at a predetermined level.
- Fig. 3 is an enlarged cross-sectional partial view of the longitudinal dam 3b and the surface of the roll 1b during stationary running of the apparatus. The same conditions symmetrically appear on the side of the longitudinal dam 3a, As shown in Fig. 3, the longitudinal dam 3 is disposed with the bottom surface 10 held slightly above the roll surface R so that an opening 11 is formed between the bottom surface 10 of the longitudinal dam 3 and the roll surface R and that during stationary running of the apparatus the opening 11 is positioned at a level of the surface 5 of molten metal in the pool.
- the longitudinal dam 3 has an inside surface 12, an outside surface 13 and a predetermined thickness 14 therebetween
- the bottom surface 10 within the range of the thickness 14 is formed a flat, preferively ably curved, surface corresponding the circumferential surface of the roll
- the longitudinal dam 3 is disposed so that the level of the surface 5 of molten metal is positioned during stationary running of the apparatus between a level of an inside lower edge 15, defined by the inside surface 12 and the bottom surface 10, and a level of an outside lower edge 16, defined by the outside surface 13 and the bottom surface 10.
- the apparatus is operated under such conditions that the surface 5 of molten metal in the pool is always positioned in the opening 11.
- the longitudinal dam 3 is partly dipped in the pool with its inside lower edge 15 immersed in molten metal and stop waves on the surface of molten metal with its inside surface 12.
- the outside lower edge 16 does not contact the molten metal entering the opening 11. If the clearance of the opening 11 is suitable, the molten metal in the opening 11 stationary forms a narrow round surface 17 which is uniform in the transverse direction (of the strip being cast) owing to a surface tension of the molten metal and the rotation of the roll 1.
- the clearance of the opening 11 should preferably be from about 2 to 10 mm. If the clearance of the opening 11 is too small, the molten metal does not effectively enter the opening 11, and thus, the advantageous results of the invention cannot be enjoyed.
- Figs. 4 and 5 show examples outside the scope of the invention.
- the longitudinal dam 3 is erected on the circumferential surface R of the roll with the bottom surface of the dam slidably contacting the surface R, and the surface 5 of molten metal is positioned substantially above the above-mentioned slidable contact surface.
- molten metal is liable to be solidified forming a so-called triple point shell 19 on the inside lower edge of the longitudinal dam, since it is cooled by both the longitudinal dam and roll.
- the longitudinal dam 3 is disposed with a considerably large opening between its bottom surface and the roll surface, and so that the whole bottom surface of the dam 3 is submerged in the molten metal.
- the casting is carried out under such conditions that the surface of molten metal goes beyond the outer lower edge 16 and reaches the circumferential surface of the roll outside the longitudinal dam 3.
- the edge 20 of the surface of molten metal coming in contact with the circumferential surface of the roll does not become linear in the transverse direction of the strip (in the direction perpendicular to the plane of the figure) and looks something like side waves hitting something.
- defects molten metal wrinkles
- the surfaces of solidified shells formed on the circumferential surface of the roll and thus, on the surfaces of the cast strip.
- occurrence of such surface defects can be prevented, since a round edge 17 of the surface of molten metal, which is linear in the transverse direction of the strip, is formed in the opening 11 by the surface tension of molten metal.
- Waves beating upon the inside surface 12 of the longitudinal dam 3 may be further minimized by providing the pouring device equipped with the exhaling slit 8 on the bottom in the manner as shown in Figs. 1 and 2, thereby eliminating or further reducing any surface defects caused by waving of the surface of molten metal in the pool.
- the longitudinal dam in the manner as shown in Fig. 4 or 5.
- the purpose of the invention is not achieved unless that position of the surface of molten metal which contact the roll surface is retained within the opening 11 formed between the bottom sur face of the longitudinal dam and the roll surface.
- the level of the surface 5 of molten metal in the pool is substantially the same as or slightly higher than the level of the round surface 17 of molten metal in the opening 11. An excessively high level of the surface 5 of molten metal in the pool should be avoided. It should also be avoided to immerse the longitudinal dam 3 so deeply that the molten metal may go beyond the longitudinal dam 3.
- the surface 17 of molten metal in the opening 11 is vigorously renewed by the rotation of the roll and the viscosity of the molten metal; no triple point corners where molten metal tends to stagnate are formed in the pool; and cooling of molten metal in the vicinity of the inside lower edge 15 is reduced, since the longitudinal dam 3 is not cooled by the roll, and therefore, formation of the triple point solidified shells 19, as shown in Fig. 4, can be effectively prevented.
- the longitudinal dams partly dam up a surface flow of molten metal in the pool, and pose a problem in that a solidified skin is likely formed on the surface of molten metal in the pool.
- This problem is, however, effectively overcome by using the pouring device 4 equipped with the exhaling slit 8 on the bottom, thereby continuously supplying super heated molten metal over the whole width of the surface of molten metal in the pool.
- the film flow of molten metal supplied by the pouring device 4 is uniform widthwise, thereby reducing localized rises of molten metal in the pool, and in turn further enhancing the widthwise uniformity of the surface 17 of molten metal in the opening 11.
- the longitudinal dams in the apparatus according to the invention do not suffer from the problem, generally inherent in longitudinal dams, of formation of the solidified skin on the surface of molten metal in the pool, and are productive of the above-mentioned desirable results.
- a suitable opening of the slit 8 is within the range of from about 2 to 7 mm.
- the apparatus according to the invention makes it possible that the surface of molten metal may come in contact with the surfaces of the rolls while forming the transversely uniform contacting edges, by means of the prescribed longitudinal dams capable of preventing formation of triple point solidified shells, and therefore, the apparatus according to the invention is productive of metal strips having enhanced surface quality which are substantially free from molten metal wrinkles.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
- The present invention relates to an improvement in a twin roll continuous casting apparatus for continuously casting a metal strip directly from a molten metal such as a molten steel.
- Well known in the art is a so-called twin roll continuous casting apparatus in which a pair of internally cooled rolls having respectively horizontal axes and rotating in opposite direction to each other are disposed parallel to each other with an appropriate gap therebetween, a pool of molten metal is formed on the circumferential surfaces (the upper halves cylindrical surfaces in the axial directions) of the rolls above the gap and the molten metal is continuously cast into a metal strip through the gap while being cooled by the circumferential surfaces of the rotating rolls. There has also been proposed such a twin roll continuous apparatus applied to a case of continuous casting of steel to produce a steel strip directly from molten steel.
- When a metal strip is continuously cast through a gap between a pair of rolls, it is necessary to form a pool of molten metal on the circumferential surfaces of the pair of rolls above the gap therebetween and to maintain a level of the molten metal in the pool substantially constant by continuously pouring the molten metal into the pool. In order to form the pool of molten metal, there are required a pair of dams having their surfaces perpendicular to the roll axes which prevent an overflow of molten metal along the roll axes on the circumferential surfaces of the rolls. These dams also serve usually to regulate the width of the cast strip and are referred to herein as "side dams". In addition to the side dams disposed at the left and right sides of the rolls, a pair of front and rear dams (referred to herein as "longitudinal dams") having their surfaces along the roll axes may be erected orthogonally to the side dams on the circumferential surfaces of the rolls so as to form a box-like pool for molten metal with the side dams and the longitudinal dams. The box-like pool serves to prevent waves of molten metal in the pool from directly hitting the surfaces of the rolls, thereby preventing formation of wrinkles (called "molten metal wrinkles") on the surfaces of the cast strip.
- If the longitudinal dams are erected on the surfaces of the rolls so as to intercept the molten metal in the pool by inside surfaces of the dams, as shown in Fig. 4, the molten metal stagnates at those corners of the pool, which are formed by the inside walls of the longitudinal dams and the surfaces of the rolls, where it is liable to be solidified forming so-called triple point shells on lower edges of the longitudinal dams, since it is cooled by both the longitudinal dams and rolls. When the triple point shells grow to a certain size, they drop from the longitudinal dams and are incorporated in surfaces of the strip being cast, causing defects of the product.
-
- An object of the invention is to provide an improved twin roll continuous casting apparatus having a pair of longitudinal dams, which is capable of preventing formation of triple point shells and avoiding adverse affects of waves of molten metal, thereby ensuring a stable production of a strip of good quality.
- An apparatus for continuously casting a metal strip according to the invention comprises a pair of internally cooled rolls rotating in the opposite direction to each other and disposed parallel to each other with their axes held horizontal, and pairs of side dams and longitudinal dams for forming a pool of molten metal on the circumferential surfaces of the pair of rolls, said pair of side dams being disposed opposite to each other in a direction perpendicular to the roll axes with a space therebetween approximately corresponding to the width of a metal strip to be cast, said pair of longitudinal dams being disposed opposite to each other in a direction parallel to the roll axes, thereby continuously casting molten metal in the pool into a metal strip through a gap between the pair of rolls, wherein said pair of longitudinal dams are disposed with their bottom surfaces held slightly above the roll surfaces so that openings are formed between the bottom surfaces of the longitudinal dams and the roll surfaces and that during stationary running of the apparatus the openings are positioned at a level of the surface of molten metal in the pool.
- Preferably, the apparatus according to the invention further comprises a pouring device having an exhaling slit on the bottom for supplying molten metal through the slit to the pool which is disposed above the pool so that the slit is positioned above the surface of molten metal in the pool and extends parallel to the gap of rolls.
- Preferred embodiments of the invention will now be described with reference to the attached drawings in which :
- Fig. 1 is a perspective view showing principal portions of an embodiment of the apparatus according to the invention;
- Fig. 2 is a cross-sectional view of the apparatus of Fig. 1 taken along a plane perpendicular to the roll axes at the center of the rolls;
- Fig. 3 is an enlarged cross-sectional partial view of the apparatus of Fig. 1 similar to Fig. 2 showing the opening between the longitudinal dam and the surface of the roll;
- Fig. 4 is a cross-sectional view similar to Fig. 3 showing an example outside the scope of the invention; and
- Fig. 5 is a cross-sectional view similar to Fig. 4 showing another example outside the scope of the invention.
- Referring to Fig. 1, reference numerals 1a, 1b designate a pair of internally cooled rolls rotating in the opposite direction to each other (the rotational directions of both rolls are shown by ar rows) and opposed parallel to each other with their roll axes held horizontal.
Reference numerals 2a, 2b designate side dams slidably contacting respective side surfaces of the rolls, and 3a, 3b longitudinal dams disposed in parallel to the roll axes and perpendicularly to the side dams. The bottom surfaces of the longitudinal dams and the surfaces of the rolls are substantially parallel to each other respectively with respective openings between them as described hereinafter in detail. The respective longitudinal dams and the respective side dams contact each other so that leakage of molten metal be prevented. The side dams may be of a type as disclosed in JP A 62-84,555 corresponding to US Patent No. 4,811,780, in which side dams are forcibly moved downwards while being abrasively worn by the rolls. Fig. 1 depicts an example of the apparatus according to the invention, which is provided with apouring device 4 for supplying molten metal to the pool defined by the longitudinal and side dams and the surfaces of the rolls.Reference numeral 5 designates a surface level of molten metal in the pool, 6 a parent nozzle for supplying molten metal to the pouring device, and 7 a strip being cast. - Fig. 2 is a cross-sectional view of the apparatus of Fig. 1 taken along a plane perpendicular to the roll axes at the center of the rolls, showing the state of casting. As shown in Figs 1 and 2, the pouring device is an intermediate vessel having an exhaling slit 8 on the bottom for supplying molten metal through the slit 8 to the pool, and is disposed above the pool so that the slit 8 is positioned above the
surface 5 of molten metal in the pool and extends parallel to the gap of rolls. Namely, the pouring device is located in position so that the direction in which the slit 8 extends is substantially in a plane which contains thenarrowest gap 9 of the rolls 1a, 1b and is perpendicular to thesurface 5 of molten metal. The length of the slit 8 is preferably as close as possible to the length of the longitudinal dams (the distance between the side dams). During stationary running of the apparatus, molten metal is continuously supplied through theparent nozzle 6 to thepouring device 4 at an appropriate rate to form a film flow of molten metal parallel to the inside surfaces of thelongitudinal dams pouring device 4 in the pool at the central portion of the longitudinal dams (the position corresponding to the narrowest gap between the rolls 1a, 1b), thereby producing thestrip 7 while maintaining thesurface 5 of molten metal in the pool at a predetermined level. - Fig. 3 is an enlarged cross-sectional partial view of the
longitudinal dam 3b and the surface of the roll 1b during stationary running of the apparatus. The same conditions symmetrically appear on the side of thelongitudinal dam 3a, As shown in Fig. 3, thelongitudinal dam 3 is disposed with thebottom surface 10 held slightly above the roll surface R so that an opening 11 is formed between thebottom surface 10 of thelongitudinal dam 3 and the roll surface R and that during stationary running of the apparatus the opening 11 is positioned at a level of thesurface 5 of molten metal in the pool. More particularly, whereas thelongitudinal dam 3 has aninside surface 12, anoutside surface 13 and apredetermined thickness 14 therebetween, thebottom surface 10 within the range of thethickness 14 is formed a flat, prefer ably curved, surface corresponding the circumferential surface of the roll, and thelongitudinal dam 3 is disposed so that the level of thesurface 5 of molten metal is positioned during stationary running of the apparatus between a level of an insidelower edge 15, defined by theinside surface 12 and thebottom surface 10, and a level of an outsidelower edge 16, defined by theoutside surface 13 and thebottom surface 10. In other words, the apparatus is operated under such conditions that thesurface 5 of molten metal in the pool is always positioned in the opening 11. - Thus, the
longitudinal dam 3 is partly dipped in the pool with its insidelower edge 15 immersed in molten metal and stop waves on the surface of molten metal with itsinside surface 12. The outsidelower edge 16 does not contact the molten metal entering the opening 11. If the clearance of the opening 11 is suitable, the molten metal in the opening 11 stationary forms anarrow round surface 17 which is uniform in the transverse direction (of the strip being cast) owing to a surface tension of the molten metal and the rotation of the roll 1. To the contrary, if the molten metal passes through the opening 11 and goes beyond the outerlower edge 16 to reach the roll surface outside thelongitudinal dam 3, the edge on the molten metal does not become linear in the transverse direction, that is, the surface of molten metal comes in contact with the circumferential surface R of the roll forming an irregular intersection line, which is a cause of occurrence of molten metal wrinkles on the surface of the cast strip. It has been found that the clearance of the opening 11 should preferably be from about 2 to 10 mm. If the clearance of the opening 11 is too small, the molten metal does not effectively enter the opening 11, and thus, the advantageous results of the invention cannot be enjoyed. On the other hand, with an opening of an unduly large clearance, a desirably roundnarrow surface 17 of molten metal is not formed in the opening, that is, the surface of molten metal in the opening becomes irregular and runs in waves. The above-mentioned clearance of from about 2 to 10 mm has been experimentally found suitable. - Figs. 4 and 5 show examples outside the scope of the invention. In the example shown in Fig. 4, the
longitudinal dam 3 is erected on the circumferential surface R of the roll with the bottom surface of the dam slidably contacting the surface R, and thesurface 5 of molten metal is positioned substantially above the above-mentioned slidable contact surface. In that case, at that corner of the pool, which is formed by the inside wall of thelongitudinal dam 3 and the surface R of the roll, molten metal is liable to be solidified forming a so-calledtriple point shell 19 on the inside lower edge of the longitudinal dam, since it is cooled by both the longitudinal dam and roll. When the triple point shell grows to a certain size, it drops from the longitudinal dam and passes through the gap of rolls together with sound shells, causing defects of the product. According to the invention, formation of such a triple point shell is prevented. In the example shown in Fig. 5, thelongitudinal dam 3 is disposed with a considerably large opening between its bottom surface and the roll surface, and so that the whole bottom surface of thedam 3 is submerged in the molten metal. In this example, the casting is carried out under such conditions that the surface of molten metal goes beyond the outerlower edge 16 and reaches the circumferential surface of the roll outside thelongitudinal dam 3. In that case, theedge 20 of the surface of molten metal coming in contact with the circumferential surface of the roll does not become linear in the transverse direction of the strip (in the direction perpendicular to the plane of the figure) and looks something like side waves hitting something. As a result surface , defects (molten metal wrinkles) appear on the surfaces of solidified shells formed on the circumferential surface of the roll, and thus, on the surfaces of the cast strip. According to the invention, occurrence of such surface defects can be prevented, since around edge 17 of the surface of molten metal, which is linear in the transverse direction of the strip, is formed in the opening 11 by the surface tension of molten metal. - Waves beating upon the
inside surface 12 of thelongitudinal dam 3 may be further minimized by providing the pouring device equipped with the exhaling slit 8 on the bottom in the manner as shown in Figs. 1 and 2, thereby eliminating or further reducing any surface defects caused by waving of the surface of molten metal in the pool. - As described above, it is outside the scope of the invention to use the longitudinal dam in the manner as shown in Fig. 4 or 5. The purpose of the invention is not achieved unless that position of the surface of molten metal which contact the roll surface is retained within the opening 11 formed between the bottom sur face of the longitudinal dam and the roll surface. The level of the
surface 5 of molten metal in the pool is substantially the same as or slightly higher than the level of theround surface 17 of molten metal in the opening 11. An excessively high level of thesurface 5 of molten metal in the pool should be avoided. It should also be avoided to immerse thelongitudinal dam 3 so deeply that the molten metal may go beyond thelongitudinal dam 3. In the apparatus according to the invention, thesurface 17 of molten metal in the opening 11 is vigorously renewed by the rotation of the roll and the viscosity of the molten metal; no triple point corners where molten metal tends to stagnate are formed in the pool; and cooling of molten metal in the vicinity of the insidelower edge 15 is reduced, since thelongitudinal dam 3 is not cooled by the roll, and therefore, formation of the triple pointsolidified shells 19, as shown in Fig. 4, can be effectively prevented. - The longitudinal dams partly dam up a surface flow of molten metal in the pool, and pose a problem in that a solidified skin is likely formed on the surface of molten metal in the pool. This problem is, however, effectively overcome by using the pouring
device 4 equipped with the exhaling slit 8 on the bottom, thereby continuously supplying super heated molten metal over the whole width of the surface of molten metal in the pool. Furthermore, the film flow of molten metal supplied by the pouringdevice 4 is uniform widthwise, thereby reducing localized rises of molten metal in the pool, and in turn further enhancing the widthwise uniformity of thesurface 17 of molten metal in the opening 11. - Accordingly, the longitudinal dams in the apparatus according to the invention, in which the pouring
device 4 having the exhaling slit 8 is provided, do not suffer from the problem, generally inherent in longitudinal dams, of formation of the solidified skin on the surface of molten metal in the pool, and are productive of the above-mentioned desirable results. In order that the slit is not clogged and capable of continuously supplying a film flow of molten metal sufficiently extending widthwise, it has been found that a suitable opening of the slit 8 is within the range of from about 2 to 7 mm. - While the invention has been illustrated with respect fixed side dams, it should be appreciated that the invention can be applied to movable side dams as well as to abradable side dams erected on the surfaces of the rolls so that st least a part of the width of each dam slidably contact the surface of each roll. Entities of the respective longitudinal dams and pouring device are made of adiabastic refractory materials.
- As described hereinabove, the apparatus according to the invention makes it possible that the surface of molten metal may come in contact with the surfaces of the rolls while forming the transversely uniform contacting edges, by means of the prescribed longitudinal dams capable of preventing formation of triple point solidified shells, and therefore, the apparatus according to the invention is productive of metal strips having enhanced surface quality which are substantially free from molten metal wrinkles. These advantages of the apparatus according to the invention are further promoted by using the herein described pouring device having the slit-shaped nozzle.
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24399488A JPH0761526B2 (en) | 1988-09-30 | 1988-09-30 | Thin plate continuous casting equipment |
JP243994/88 | 1988-09-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0363702A1 true EP0363702A1 (en) | 1990-04-18 |
EP0363702B1 EP0363702B1 (en) | 1992-12-16 |
Family
ID=17112134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890117471 Expired EP0363702B1 (en) | 1988-09-30 | 1989-09-21 | Apparatus for continuous casting of metal strip |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0363702B1 (en) |
JP (1) | JPH0761526B2 (en) |
DE (1) | DE68903922T2 (en) |
ES (1) | ES2036775T3 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2305144A (en) * | 1995-09-14 | 1997-04-02 | Ishikawajima Harima Heavy Ind | Strip casting using nozzle with side openings |
CN115106494A (en) * | 2022-05-27 | 2022-09-27 | 燕山大学 | Flexible forming device and method for spiral groove pipe |
-
1988
- 1988-09-30 JP JP24399488A patent/JPH0761526B2/en not_active Expired - Fee Related
-
1989
- 1989-09-21 EP EP19890117471 patent/EP0363702B1/en not_active Expired
- 1989-09-21 DE DE1989603922 patent/DE68903922T2/en not_active Expired - Fee Related
- 1989-09-21 ES ES89117471T patent/ES2036775T3/en not_active Expired - Lifetime
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN, vol. 12, no. 222 (M-712)[3069], 24 June 1988; & JP-A-63 20 141 (KAWASAKI STEEL CORP.) 27 January 1988 * |
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 263 (M-342)[1700], 4 December 1984; & JP-A-59 137 162 (ISHIKAWAJIMA HANIMA JUKOGYO K.K.) 7 August 1984 * |
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 152 (M-391)[1875], 27 June 1985; & JP-A-60 27 448 (ISHI KAWAJIMA HARIMA JUKOGYO K.K.) 12 February 1985 * |
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 60 (M-364)[1783], 16 March 1985; & JP-A-59 193 739 (NIPPON KOKAN K.K.) 2 November 1984 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2305144A (en) * | 1995-09-14 | 1997-04-02 | Ishikawajima Harima Heavy Ind | Strip casting using nozzle with side openings |
GB2305144B (en) * | 1995-09-14 | 1999-09-01 | Ishikawajima Harima Heavy Ind | Strip casting |
CN115106494A (en) * | 2022-05-27 | 2022-09-27 | 燕山大学 | Flexible forming device and method for spiral groove pipe |
CN115106494B (en) * | 2022-05-27 | 2023-08-18 | 燕山大学 | Flexible forming device and method for spiral groove pipe |
Also Published As
Publication number | Publication date |
---|---|
JPH0292440A (en) | 1990-04-03 |
JPH0761526B2 (en) | 1995-07-05 |
DE68903922T2 (en) | 1993-07-01 |
DE68903922D1 (en) | 1993-01-28 |
ES2036775T3 (en) | 1993-06-01 |
EP0363702B1 (en) | 1992-12-16 |
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