CA2121011A1 - Plant for manufacturing a steel strip from a cast steel billet - Google Patents
Plant for manufacturing a steel strip from a cast steel billetInfo
- Publication number
- CA2121011A1 CA2121011A1 CA002121011A CA2121011A CA2121011A1 CA 2121011 A1 CA2121011 A1 CA 2121011A1 CA 002121011 A CA002121011 A CA 002121011A CA 2121011 A CA2121011 A CA 2121011A CA 2121011 A1 CA2121011 A1 CA 2121011A1
- Authority
- CA
- Canada
- Prior art keywords
- plant
- steel billet
- rolls
- billet
- forming
- 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.)
- Abandoned
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 21
- 239000010959 steel Substances 0.000 title claims abstract description 21
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 5
- 239000007921 spray Substances 0.000 claims abstract description 14
- 238000009749 continuous casting Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 17
- 238000003825 pressing Methods 0.000 description 20
- 239000002245 particle Substances 0.000 description 13
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 238000012360 testing method 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- 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
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Nozzles (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A plant for manufacturing a steel strip by deforming a cast steel billet includes a continuous casting machine with an oscillating open-ended mold having cooled walls and a forming unit for the steel billet which is equipped with forming rolls and is arranged at the exit of the mold. Spray nozzles are directed against the forming rolls on the side of the forming rolls facing away from the billet.
A plant for manufacturing a steel strip by deforming a cast steel billet includes a continuous casting machine with an oscillating open-ended mold having cooled walls and a forming unit for the steel billet which is equipped with forming rolls and is arranged at the exit of the mold. Spray nozzles are directed against the forming rolls on the side of the forming rolls facing away from the billet.
Description
2121~11 BACKGROUND O~ THE INVENTION
1. Field of the ~n~ention The present invention relates to a plant for manufacturing a steel strip by deforming a cast steel billet. The plant includes a continuous casting machine with an oscillating open-ended mold having cooled walls and a forming unit for the steel billet which is equipped with forming rolls and is arranged at the exit of the mold.
1. Field of the ~n~ention The present invention relates to a plant for manufacturing a steel strip by deforming a cast steel billet. The plant includes a continuous casting machine with an oscillating open-ended mold having cooled walls and a forming unit for the steel billet which is equipped with forming rolls and is arranged at the exit of the mold.
2. Descri~tion o the Related Art A plant of the above-described type is known from EP-B1-0 326 190. This plant makes it possible to produce a billet which is close and free of shrinkage cavities and has a thickness which is substantially reduced as compared to the steel billet leaving the mold. In addition, a finely particulate cast structure can ~ -be achieved for further processing. The squeezing and pressing rolls of the forming unit arranged at the mold exit press the steel billet together to such an extent that the inner walls of the already solidified billet shells are welded together.
Because of the small thickness of the steel billet leaving the oscillating mold and the subsequent thickness reduction in the forming unit of the steel billet which has not yet fully :: ,:, . . : - . : . ., - -, , : - - , ~ - , . . .
,, . : , ,- , ,, :, :
: . . : ~ , 21210:~1 solidified, and by using at least one roll stand following the forming unit, it is easily possible to obtain steel billets having a thickness which is substantially below 25mm.
However, it has been found that slag and scale build up on the squeezing and pressing rolls. Consequently, in strips produced in such plants, this causes on the surfaces of the strips slag and scale troughs which can also not be removed in the subsequent high-reduction step, i.e., in the rolling stand.
The evaluation of strip sections with intentional emergency stoppage has shown that slag and scale are rolled into the cast steel billet in the squeezing and pressing roll gap when the cast steel billet travels through the forming unit.
Therefore, it has been attempted to remove slag and scal~
from the cast steel billet even before it enters the squeezing and pressing rollers. Tests in which slag and scale were removed by means of a stationary turborotor have shown that slag and scale can be completely removed from the strip surface when pressing water is used with pressures of more than 200 bars. It must be ensured in this connection that the pressing water and the removed scale and slag particles are completely suctioned off in order to avoid surface defects. This means that complicated equipment, substantial maintenance and high operating costs are ,, , ~ . ...
- : . - :. ~
required for the removal of the pressing water and of the separated slag and scale particles.
. :- . .., : ~
, ~, . I ~
4 ~ ::
, ~.
212~.0~1 S~MMARY 0~ THE INVENTION
Therefore, it is the primary object of the present invention to provide a plant of the above-described type in which it is ensured that a unit for removing slag and scale cooperating with the forming rolls does not cause surface defects in th~ steel strip.
In accordance with the present invention, spray nozzles are directed against the forming rolls on the side of the forming rolls facing away from the billet.
Surprisingly, it has been found that all of the above-mentioned disadvantages can be eliminated by spraying the pressing water directly against the forming rolls. The high impact energy of the water jets of the pressing water sprayed against the forming rolls has the effect that the water as well as slag and scale particles are separated from the surface and no longer enter the roll gap.
In accordance with a preferred further development of the invention, the spray nozzles are arranged in box-shaped enclosures. The er.closures are preferably biased against the forming rolls by means of springs.
, . . : ,, By arranging the spray nozzles in enclosures, it is ensured that the pressing water and the separated slag and scale particles do not again reach the strip surface and, thus, the -: : , ~- .
:~ .
212101~
roll gap. A separate removal of the pressing water and particles has become possible. Finally, by biasing the enclosures against the forming rolls by means of springs, the roll surfaces are stripped in front of and behind the nozzles, so that any slag and scale particles still adhering to the surfaces of the forming rolls and not yet separated by the pressing water jets are removed at the latest at this time and can no longer reach the strip surface.
In accordance with an alternative or supplemental feature, structural components, preferably in the form of baffle plates, are provided at the spray nozzles for removing the water and the scale and slag particles. The baffle plates are arranged following the forming rolls in casting direction, i.e., the baffle plates are arranged underneath the rolls. The baffle plates make it possible to collect the water and particles separated from the rolls and contained in the water and to remove the water from the roll area before it could again drop onto the rolls arranged underneath and before it can reach the strip -surface.
The various features of novelty which characterize the invention are pointed out with particularity in the claims ~ -annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, . ~: .. , - -. . .
specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there is illustrated .
and described a preferred embodiment of the invention.
,, .
"" ~, "',~, ., . . .
21210~ 1 BRIEF DESCRIPTION O~ THE D~AWING
In the drawing:
The single figure of the drawing is a schematic sectional view of the plant according to the present invention.
: :: ~ - , , ,,,, -.: ::: , :,, ~ . ~ . ~ -, -21~011 DESCRIPTION OF T~E PREFERR~D R~RO~IMENT
As shown in the drawing, a forming unit 2 is arranged at the exit of a mold 1. The drawing does not show the other components required for manufacturing thin steel strips from cast steel billets which are known in the art.
In the illustrated embodiment, the forming unit 2 includes upper squeezing rolls 3 and lower pressing rolls 4, wherein the squeezing rolls have a smaller diameter than the pressing rolls 4. The steel billet 5 which is leaving the mold 1 and whose core is still liquid is pressed together by the squeezing rolls 3 and pressing rolls 4 in such a way that the inner walls of the already solidified billet shell are welded together;
simultaneously, the rolls reduce the thickness of the steel billet 5 before the steel billet 5 is reduced to its final thickness in a single-stage high reduction carried out in a subsequent rolling stand.
Several spray nozzles 7 are arranged distributed over the length of each squeezing roll 3 and pressing roll 4. The spray nozzles 7 are arranged in box-like enclosures 6 on the side facing away from the billet 5. The spray nozzles 7 spray pressing water under high pressure against the roll surfaces and separate from the rolls any slag and scale particles which have been picked up from the surface of the steel billet 5 by the ', ..-,'' ', ' ,, ~ ','-` ,' , ', : ' ,' '' ~',, squeezing rolls 3 and the pressing rolls 4. Any residues or particles which still adhere to the roll surfaces are stripped off by the enclosures 6 which are biased against the roll surfaces by means of compression springs 8 and, consequently, provide with their edges resting against the rolls a stripping effect in front of and behind the spray nozzles 7. The slag and scale particles stripped off by the edges of the enclosures drop onto structural co~ponents in the form of baffle plates 9 which area arranged outwardly inclined from the steel billet 5 and, thus, convey the particles away from the billet and the plant.
If the enclosures 6 are not provided, the baffle plates 9 would additionally convey away the spray water.
Thus, the enclosures 6 and/or the baffle plates 9 ensure that the sprayed-on pressing water and the separated slag and scale particles do not again reach the surface of the steel billet 5 and the roll gaps of the squeezing rolls 4 and the pressing rolls 4.
The invention is not limited by the embodiment described above which is presented as an example only but can be modified in various ways within the scope of protection defined by the appended patent claims.
, ' ' " ::,: ' ' , ~ " ' ' ~ ' ' ' ,,
Because of the small thickness of the steel billet leaving the oscillating mold and the subsequent thickness reduction in the forming unit of the steel billet which has not yet fully :: ,:, . . : - . : . ., - -, , : - - , ~ - , . . .
,, . : , ,- , ,, :, :
: . . : ~ , 21210:~1 solidified, and by using at least one roll stand following the forming unit, it is easily possible to obtain steel billets having a thickness which is substantially below 25mm.
However, it has been found that slag and scale build up on the squeezing and pressing rolls. Consequently, in strips produced in such plants, this causes on the surfaces of the strips slag and scale troughs which can also not be removed in the subsequent high-reduction step, i.e., in the rolling stand.
The evaluation of strip sections with intentional emergency stoppage has shown that slag and scale are rolled into the cast steel billet in the squeezing and pressing roll gap when the cast steel billet travels through the forming unit.
Therefore, it has been attempted to remove slag and scal~
from the cast steel billet even before it enters the squeezing and pressing rollers. Tests in which slag and scale were removed by means of a stationary turborotor have shown that slag and scale can be completely removed from the strip surface when pressing water is used with pressures of more than 200 bars. It must be ensured in this connection that the pressing water and the removed scale and slag particles are completely suctioned off in order to avoid surface defects. This means that complicated equipment, substantial maintenance and high operating costs are ,, , ~ . ...
- : . - :. ~
required for the removal of the pressing water and of the separated slag and scale particles.
. :- . .., : ~
, ~, . I ~
4 ~ ::
, ~.
212~.0~1 S~MMARY 0~ THE INVENTION
Therefore, it is the primary object of the present invention to provide a plant of the above-described type in which it is ensured that a unit for removing slag and scale cooperating with the forming rolls does not cause surface defects in th~ steel strip.
In accordance with the present invention, spray nozzles are directed against the forming rolls on the side of the forming rolls facing away from the billet.
Surprisingly, it has been found that all of the above-mentioned disadvantages can be eliminated by spraying the pressing water directly against the forming rolls. The high impact energy of the water jets of the pressing water sprayed against the forming rolls has the effect that the water as well as slag and scale particles are separated from the surface and no longer enter the roll gap.
In accordance with a preferred further development of the invention, the spray nozzles are arranged in box-shaped enclosures. The er.closures are preferably biased against the forming rolls by means of springs.
, . . : ,, By arranging the spray nozzles in enclosures, it is ensured that the pressing water and the separated slag and scale particles do not again reach the strip surface and, thus, the -: : , ~- .
:~ .
212101~
roll gap. A separate removal of the pressing water and particles has become possible. Finally, by biasing the enclosures against the forming rolls by means of springs, the roll surfaces are stripped in front of and behind the nozzles, so that any slag and scale particles still adhering to the surfaces of the forming rolls and not yet separated by the pressing water jets are removed at the latest at this time and can no longer reach the strip surface.
In accordance with an alternative or supplemental feature, structural components, preferably in the form of baffle plates, are provided at the spray nozzles for removing the water and the scale and slag particles. The baffle plates are arranged following the forming rolls in casting direction, i.e., the baffle plates are arranged underneath the rolls. The baffle plates make it possible to collect the water and particles separated from the rolls and contained in the water and to remove the water from the roll area before it could again drop onto the rolls arranged underneath and before it can reach the strip -surface.
The various features of novelty which characterize the invention are pointed out with particularity in the claims ~ -annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, . ~: .. , - -. . .
specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there is illustrated .
and described a preferred embodiment of the invention.
,, .
"" ~, "',~, ., . . .
21210~ 1 BRIEF DESCRIPTION O~ THE D~AWING
In the drawing:
The single figure of the drawing is a schematic sectional view of the plant according to the present invention.
: :: ~ - , , ,,,, -.: ::: , :,, ~ . ~ . ~ -, -21~011 DESCRIPTION OF T~E PREFERR~D R~RO~IMENT
As shown in the drawing, a forming unit 2 is arranged at the exit of a mold 1. The drawing does not show the other components required for manufacturing thin steel strips from cast steel billets which are known in the art.
In the illustrated embodiment, the forming unit 2 includes upper squeezing rolls 3 and lower pressing rolls 4, wherein the squeezing rolls have a smaller diameter than the pressing rolls 4. The steel billet 5 which is leaving the mold 1 and whose core is still liquid is pressed together by the squeezing rolls 3 and pressing rolls 4 in such a way that the inner walls of the already solidified billet shell are welded together;
simultaneously, the rolls reduce the thickness of the steel billet 5 before the steel billet 5 is reduced to its final thickness in a single-stage high reduction carried out in a subsequent rolling stand.
Several spray nozzles 7 are arranged distributed over the length of each squeezing roll 3 and pressing roll 4. The spray nozzles 7 are arranged in box-like enclosures 6 on the side facing away from the billet 5. The spray nozzles 7 spray pressing water under high pressure against the roll surfaces and separate from the rolls any slag and scale particles which have been picked up from the surface of the steel billet 5 by the ', ..-,'' ', ' ,, ~ ','-` ,' , ', : ' ,' '' ~',, squeezing rolls 3 and the pressing rolls 4. Any residues or particles which still adhere to the roll surfaces are stripped off by the enclosures 6 which are biased against the roll surfaces by means of compression springs 8 and, consequently, provide with their edges resting against the rolls a stripping effect in front of and behind the spray nozzles 7. The slag and scale particles stripped off by the edges of the enclosures drop onto structural co~ponents in the form of baffle plates 9 which area arranged outwardly inclined from the steel billet 5 and, thus, convey the particles away from the billet and the plant.
If the enclosures 6 are not provided, the baffle plates 9 would additionally convey away the spray water.
Thus, the enclosures 6 and/or the baffle plates 9 ensure that the sprayed-on pressing water and the separated slag and scale particles do not again reach the surface of the steel billet 5 and the roll gaps of the squeezing rolls 4 and the pressing rolls 4.
The invention is not limited by the embodiment described above which is presented as an example only but can be modified in various ways within the scope of protection defined by the appended patent claims.
, ' ' " ::,: ' ' , ~ " ' ' ~ ' ' ' ,,
Claims (5)
1. A plant for manufacturing a steel strip by deforming a cast steel billet, the plant comprising a continuous casting machine with an oscillating open-ended mold having cooled walls and a mold exit, a forming unit arranged at the mold exit, the forming unit having forming rolls, each forming roll having a side facing away from the steel billet, further comprising spray nozzles directed against the forming rolls on the side facing away from the steel billet.
2. The plant according to claim 1, further comprising box-like enclosures, the spray nozzles being mounted in the enclosures.
3. The plant according to claim 1, comprising spring means for biasing the enclosures against the forming rolls.
4. The plant according to claim 1, comprising conveying means for conveying water and slag and scale away from the spray nozzles.
5. The plant according to claim 4, wherein the conveying means are baffle plates.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4312277.9 | 1993-04-15 | ||
| DE4312277A DE4312277A1 (en) | 1993-04-15 | 1993-04-15 | Plant for producing a steel strip from a cast steel strand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2121011A1 true CA2121011A1 (en) | 1994-10-16 |
Family
ID=6485511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002121011A Abandoned CA2121011A1 (en) | 1993-04-15 | 1994-04-11 | Plant for manufacturing a steel strip from a cast steel billet |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0620063B1 (en) |
| AT (1) | ATE163376T1 (en) |
| CA (1) | CA2121011A1 (en) |
| DE (2) | DE4312277A1 (en) |
| ES (1) | ES2113007T3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10325955A1 (en) | 2003-06-07 | 2004-12-23 | Sms Demag Ag | Process and plant for producing steel products with the best surface quality |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT314752B (en) * | 1971-04-30 | 1974-04-25 | Voest Ag | Continuous caster for slabs |
| DE3624794A1 (en) * | 1986-07-22 | 1988-02-04 | Mannesmann Ag | Device for continuous descaling |
| DE4010963A1 (en) * | 1990-04-05 | 1991-10-10 | Schloemann Siemag Ag | Continuous cast metal cleaner - has scrapers on both sides of metal under the die to detach scale and slag |
| DE4123956C2 (en) * | 1991-07-19 | 1994-07-21 | Thyssen Stahl Ag | Process and plant for producing a metal strand by casting |
-
1993
- 1993-04-15 DE DE4312277A patent/DE4312277A1/en not_active Withdrawn
-
1994
- 1994-04-06 AT AT94105298T patent/ATE163376T1/en active
- 1994-04-06 ES ES94105298T patent/ES2113007T3/en not_active Expired - Lifetime
- 1994-04-06 EP EP94105298A patent/EP0620063B1/en not_active Expired - Lifetime
- 1994-04-06 DE DE59405282T patent/DE59405282D1/en not_active Expired - Fee Related
- 1994-04-11 CA CA002121011A patent/CA2121011A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0620063B1 (en) | 1998-02-25 |
| EP0620063A1 (en) | 1994-10-19 |
| ES2113007T3 (en) | 1998-04-16 |
| DE4312277A1 (en) | 1994-10-20 |
| ATE163376T1 (en) | 1998-03-15 |
| DE59405282D1 (en) | 1998-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |