CN114682752A - Method for quickly replacing online tundish of ultra-wide thin slab continuous casting machine - Google Patents
Method for quickly replacing online tundish of ultra-wide thin slab continuous casting machine Download PDFInfo
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- CN114682752A CN114682752A CN202210355945.XA CN202210355945A CN114682752A CN 114682752 A CN114682752 A CN 114682752A CN 202210355945 A CN202210355945 A CN 202210355945A CN 114682752 A CN114682752 A CN 114682752A
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- 238000000034 method Methods 0.000 title claims abstract description 65
- 238000009749 continuous casting Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 125
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 239000002893 slag Substances 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000000498 cooling water Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 description 23
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B22D11/16—Controlling or regulating processes or operations
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
The invention discloses a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine, which comprises the following specific steps: before the tundish is replaced, the thickness of a casting powder layer in the crystallizer is controlled, sintered slag blocks in the casting powder layer are cleaned, and casting powder slag strips attached to the wall of the crystallizer are cleaned; before the tundish is replaced and after the ladle is closed, the drawing speed is controlled to be reduced along with the continuous reduction of molten steel in the old tundish, and secondary cold water weak cooling control is carried out in the process of controlling the drawing speed; after the tundish is replaced, controlling the pulling speed to be increased, and controlling the secondary cooling water to be cooled normally; the method is suitable for the continuous casting machine, and can effectively realize the quick and safe replacement of the ultra-wide thin slab tundish through the method.
Description
Technical Field
The invention belongs to the technical field of continuous casting machines, and particularly relates to a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine.
Background
The continuous casting machine crystallizer is used for forcibly cooling high-temperature molten steel continuously injected into the continuous casting machine crystallizer through the water-cooled copper plate, guiding heat of the high-temperature molten steel out, enabling the high-temperature molten steel to be rapidly solidified into a casting blank with a required section shape and blank shell thickness, and enabling the casting blank with a liquid core part to be continuously pulled out from the lower opening of the crystallizer, so that conditions are created for the complete solidification of the casting blank in a secondary cooling area. Because the service life of the tundish lining and other shaping refractory materials is limited, the tundish needs to be replaced when the service life is limited. In the past, ultra-wide thin slabs (the thickness is 150mm, the maximum width is 3250mm) are replaced by tundish according to the modes of pouring stopping, tail slab pulling, ingot pulling, pouring starting and the like, the downtime is 65min, and the effective operation rate is limited to a certain extent.
In the test of quickly changing the tundish before the ultra-wide thin slab, due to the large width and the relatively thin thickness of the ultra-wide thin slab, the situation that the slab shell of the casting blank tail slab in the crystallizer is excessively shrunk to generate a large air gap with the wall of the crystallizer is caused, the molten steel seeps out of the crystallizer along the air gap after re-casting is caused, so that the foot roll of the crystallizer is stuck with cold steel, and large production hidden troubles exist. Moreover, when a new tundish is placed at a pouring position, the tundish is pulled out after the tundish is poured, and is forced to be pulled out manually, production preparation is made again, and the single-time influence time reaches 4 hours. Therefore, a special attack on the ultra-wide thin slab quick-change tundish is developed, and an online tundish quick-change replacing method of an ultra-wide thin slab continuous casting machine is provided to solve the problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine comprises the following specific steps:
(S1) before replacing the tundish, controlling the thickness of the casting powder layer in the crystallizer, cleaning sintered slag blocks in the casting powder layer, and cleaning casting powder slag strips attached to the wall of the crystallizer;
(S2) before replacing the tundish and after closing the ladle, controlling the pulling speed to fall along with the continuous falling of molten steel in the old tundish, and performing secondary cold water weak cooling control in the pulling speed controlling process;
after the tundish is replaced, controlling the pulling speed to be increased, and controlling the secondary cooling water to be cooled normally;
(S3) switching the new tundish and the old tundish in the pouring position at the first preheating position by starting the first tundish car and the second tundish car, and simultaneously driving the first tundish car from the first preheating position to the pouring position.
Preferably, the step (S2) of controlling the pulling rate to be reduced is to reduce the pulling rate from normal 1.20m/min to 0.4 m/min;
the node for controlling the secondary cold water weak cooling in the step (S2) is that the pulling speed is reduced to 0.8 m/min;
in the step (S2), after the tundish is replaced, the casting blank pulling speed is increased to 0.8 m/min.
Preferably, the method also comprises a step of preventing the shrinkage of the tail billet shell, and the specific steps are as follows:
after the old tundish at the original casting position stops casting, vertically inserting the shrinkage-proof insert into the casting blank shell and connecting the shrinkage-proof insert with the unset molten steel, wherein the shrinkage-proof insert is supported between the inner arc and the outer arc of the casting blank shell;
controlling the crystallizer, and reducing the cooling water quantity of the crystallizer to 3000 NL/min;
and when the steel ladle containing the molten steel and the new tundish reach the pouring position to prepare for pouring, the water flow of the crystallizer is restored to 5200NL/min which is automatically controlled.
Preferably, the method also comprises a new tundish submerged nozzle and casting blank control process, and comprises the following specific steps:
controlling the tail part of the casting blank shell to descend to a set position through a withdrawal and straightening system during the replacement of a new tundish and an old tundish;
after the new tundish reaches the pouring position, controlling the first tundish car to descend to a set height;
and after the first tundish car carrying the new tundish reaches the pouring position, rotating the ladle turret to transfer the ladle containing the molten steel to be poured to the pouring position.
Preferably, in the new tundish submerged nozzle and casting blank control process, the withdrawal and straightening system controls the tail of the casting blank shell to descend to a set position, and the set height is as follows: the tail part of the casting blank shell is 350mm away from the upper opening of the crystallizer;
in the new tundish submerged nozzle and casting blank control procedure, after a new tundish reaches a pouring position, a first tundish car is controlled to descend to a set height, and the set height is as follows: the distance from the bottom of the submerged nozzle to the upper surface of the unset molten steel at the tail part of the casting blank shell is 50-60 mm.
Preferably, the method also comprises a wide-section casting blank reconnection control process, and the method comprises the following specific steps:
opening a steel ladle sliding plate containing molten steel to be poured;
pouring the molten steel into a new tundish, performing full-flow casting on the new tundish when the depth of the molten steel in the new tundish is 200mm, and adding new covering slag when the molten steel is immersed on the upper edge of the side hole of the submerged nozzle;
and starting a casting blank withdrawal and straightening system, pulling a casting blank at a withdrawal speed of 0.3m/min, measuring and calculating the withdrawal speed of the casting blank which is reprinted out of the lower opening of the crystallizer, and gradually increasing the withdrawal speed to 0.8 m/min.
Preferably, the method further comprises a control process of the automatic continuous printing roller, and the specific steps are as follows:
when the old tundish stops casting, the working mode of the casting machine is switched to a 'mixed casting' mode, and the tail position of the casting blank shell can be automatically marked in the mode, namely the casting blank reconnection position;
with the increase of the casting speed of the new tundish, the casting blank is re-printed and enters the fan-shaped section along with the exit of the casting blank from the crystallizer;
and before every 2-8 sections of driving roller positions, the system can adjust the lifting of the driving roller according to the marked casting blank reconnection printing position, so that the fractured casting blank reconnection printing or the damage to the driving roller is avoided.
According to the invention, through the adjustment of cooling water of the crystallizer, the thickness control of the casting powder and the shrinkage prevention connecting plug-in, the shrinkage of the tail billet in the crystallizer before quick replacement is greatly reduced, the steel infiltration at the lower opening of the re-cast crystallizer is avoided, and the good connection of new and old casting blanks is realized; by controlling the quick-change forward drawing speed, the secondary cooling strength and the like, the thickness of a formed good tail billet shell is realized, the withdrawal and straightening resistance of the fan-shaped section is reduced, and the casting blank is normally drawn out of the fan-shaped section after quick change;
the method for quickly replacing the ultra-wide thin slab tundish is convenient for personnel to use and operate, reduces the labor intensity, improves the working efficiency, lightens the bonding probability of the casting crystallizer, and greatly improves the effective operation rate of the ultra-wide thin slab casting machine.
Drawings
FIG. 1 is a schematic view showing the operation of the present invention for replacing the mold flux before the tundish is replaced;
FIG. 2 is a schematic view of a replacement tundish of the present invention;
FIG. 3 is a schematic view of tundish submerged nozzle and casting blank control in the present invention;
FIG. 4 is a graph showing the pull-up control curve of the present invention.
Reference numerals: 1. a crystallizer; 2. casting blank shell; 3. non-solidified molten steel; 4. a first tundish car; 5. a second tundish car; 6. a ladle turret; 7. a new tundish; 8. an old tundish; 15. a ladle; 17. an immersion nozzle; 18. a protective slag layer; 19. covering slag strips; 20. an anti-shrink insert; 21. an air gap; 23. the crystallizer wall.
Detailed Description
The following further describes a specific embodiment of the method for rapidly replacing the online tundish of the ultra-wide thin slab caster according to the invention with reference to the attached drawings 1-4. The method for rapidly replacing the online tundish of the ultra-wide thin slab caster is not limited to the description of the following embodiment.
Example 1:
the embodiment provides a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine, which comprises the following specific steps as shown in figures 1-4:
(S1) controlling the thickness of the protective slag layer 18 in the crystallizer 1 30 minutes before the tundish is replaced quickly, accelerating the updating of the protective slag near the submerged nozzle 17, cleaning up the sintering slag blocks in the protective slag layer 18, and cleaning up the protective slag strips 19 attached to the wall 23 of the crystallizer simultaneously, so as to avoid the steel leakage accident caused by the fact that the slag strips are wound into a blank shell after the tundish is replaced;
(S2) before replacing the tundish and after closing the ladle 15, reducing the drawing speed from normal 1.20m/min to 0.4m/min according to a control curve of a graph 4 along with the continuous reduction of molten steel in the old tundish 8, and performing secondary cold water weak cooling control in the process of controlling the drawing speed to avoid the abnormal condition of immovable drawing caused by over-thick thickness and over-high hardness of the casting blank shell 2 during low drawing speed and stopping drawing and straightening;
after the tundish is replaced, the casting blank casting speed is increased to 0.8m/min, and secondary cooling water is controlled to be cooled normally;
(S3), the new tundish 7 at the first preheating position is switched to the old tundish 8 at the casting position by operating the first tundish car 4 and the second tundish car 5, and the first tundish car 4 is driven from the first preheating position to the casting position.
Example 2:
the embodiment provides a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine, which comprises the following specific steps as shown in figures 1-4:
(S1) controlling the thickness of the protective slag layer 18 in the crystallizer 1 30 minutes before the tundish is replaced quickly, accelerating the updating of the protective slag near the submerged nozzle 17, cleaning up the sintering slag blocks in the protective slag layer 18, and cleaning up the protective slag strips 19 attached to the wall 23 of the crystallizer simultaneously, so as to avoid the steel leakage accident caused by the fact that the slag strips are wound into a blank shell after the tundish is replaced;
(S2) before replacing the tundish and after closing the ladle 15, reducing the drawing speed from normal 1.20m/min to 0.4m/min according to a control curve of a graph 4 along with the continuous reduction of molten steel in the old tundish 8, and performing secondary cold water weak cooling control in the process of controlling the drawing speed to avoid the abnormal condition of immovable drawing caused by over-thick thickness and over-high hardness of the casting blank shell 2 during low drawing speed and stopping drawing and straightening;
after the tundish is replaced, the casting blank casting speed is increased to 0.8m/min, and secondary cooling water is controlled to be cooled normally;
(S3), the first tundish car 4 is moved from the first preheating position to the pouring position while the first tundish car 4 is moved to the pouring position by switching the first tundish car 4 and the second tundish car 5 between the new tundish 7 at the first preheating position and the old tundish 8 at the pouring position.
The method also comprises a working procedure of preventing the shrinkage of the tail billet shell, and comprises the following specific steps:
after the old tundish 8 at the original casting position stops casting, the anti-shrinkage insert 20 is vertically inserted into the casting blank shell 2 and is connected with the non-solidified molten steel 3, and the anti-shrinkage insert 20 is supported between the inner arc and the outer arc of the casting blank shell 2 so as to reduce the shrinkage of the inner arc and the outer arc towards the non-solidified molten steel 3 side;
controlling the crystallizer 1, reducing the cooling water amount of the crystallizer 1 to 3000NL/min, weakening the heat released from the casting blank shell 2 by weakening the water flow of the crystallizer 1, thereby lightening the cooling shrinkage, ensuring that an air gap 21 generated between the casting blank shell 2 and the crystallizer wall 23 does not extend to the lower opening of the crystallizer wall 23, and avoiding the molten steel poured from a new tundish 7 from seeping out of the crystallizer 1;
and when the steel ladle 15 containing the molten steel and the new tundish 7 reach the pouring position to prepare for pouring, the water flow of the crystallizer 1 is restored to 5200NL/min which is automatically controlled.
Example 3:
the embodiment provides a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine, which comprises the following specific steps as shown in figures 1-4:
(S1) controlling the thickness of the protective slag layer 18 in the crystallizer 1 30 minutes before the tundish is replaced quickly, accelerating the updating of the protective slag near the submerged nozzle 17, cleaning up the sintering slag blocks in the protective slag layer 18, and cleaning up the protective slag strips 19 attached to the wall 23 of the crystallizer simultaneously, so as to avoid the steel leakage accident caused by the fact that the slag strips are wound into a blank shell after the tundish is replaced;
(S2) before the tundish is replaced and after the ladle 15 is closed, the drawing speed is reduced to 0.4m/min from normal 1.20m/min according to a control curve of a graph 4 along with the continuous reduction of molten steel in the old tundish 8, and secondary cooling water weak cooling control is carried out in the process of controlling the drawing speed, so that the abnormal condition of pulling immobility caused by the excessively thick thickness and the excessively large hardness of the casting blank shell 2 during the low drawing speed and the pulling straightening stopping period is avoided;
after the tundish is replaced, the casting blank casting speed is increased to 0.8m/min, and secondary cooling water is controlled to be cooled normally;
(S3), the new tundish 7 at the first preheating position is switched to the old tundish 8 at the casting position by operating the first tundish car 4 and the second tundish car 5, and the first tundish car 4 is driven from the first preheating position to the casting position.
The method also comprises a new tundish 7 submerged nozzle 17 and a casting blank control process, and comprises the following specific steps:
during the replacement of the new tundish 7 and the old tundish 8, the withdrawal and straightening system controls the tail part of the casting blank shell 2 to descend to a position 350mm away from the upper opening of the crystallizer 1, and withdrawal and straightening are stopped;
after the new tundish 7 reaches the pouring position, operating the first tundish car 4 to descend until the distance between the bottom of the submerged nozzle 17 and the protective slag on the non-solidified molten steel 3 at the tail part of the casting blank shell 2 is 50-60 mm;
after the first tundish car 4 carrying the new tundish 7 reaches the pouring position, the ladle turret 6 is rotated to rotate the ladle 15 carrying the molten steel to be poured to the pouring position.
Example 4:
the embodiment provides a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine, which comprises the following specific steps as shown in figures 1-4:
(S1) controlling the thickness of the protective slag layer 18 in the crystallizer 1 30 minutes before the tundish is replaced quickly, accelerating the updating of the protective slag near the submerged nozzle 17, cleaning up the sintering slag blocks in the protective slag layer 18, and cleaning up the protective slag strips 19 attached to the wall 23 of the crystallizer simultaneously, so as to avoid the steel leakage accident caused by the fact that the slag strips are wound into a blank shell after the tundish is replaced;
(S2) before replacing the tundish and after closing the ladle 15, reducing the drawing speed from normal 1.20m/min to 0.4m/min according to a control curve of a graph 4 along with the continuous reduction of molten steel in the old tundish 8, and performing secondary cold water weak cooling control in the process of controlling the drawing speed to avoid the abnormal condition of immovable drawing caused by over-thick thickness and over-high hardness of the casting blank shell 2 during low drawing speed and stopping drawing and straightening;
after the tundish is replaced, the casting blank casting speed is increased to 0.8m/min, and secondary cooling water is controlled to be cooled normally;
(S3), the first tundish car 4 is moved from the first preheating position to the pouring position while the first tundish car 4 is moved to the pouring position by switching the first tundish car 4 and the second tundish car 5 between the new tundish 7 at the first preheating position and the old tundish 8 at the pouring position.
The method also comprises a wide-section casting blank reconnection control process, and the method comprises the following specific steps:
opening a sliding plate of a steel ladle 15 containing molten steel to be poured;
pouring the molten steel into a new tundish 7, performing full-flow pouring of the tundish when the depth of the molten steel in the new tundish 7 is 200mm, and adding new protective slag when the molten steel is immersed on the upper edge of the side hole of the submerged nozzle 17;
and starting a casting blank withdrawal and straightening system, pulling a casting blank at a pulling speed of 0.3m/min, measuring and calculating the pulling speed which is gradually increased to 0.8m/min after the casting blank is reprinted out of the lower opening of the crystallizer 1.
Example 5:
the embodiment provides a method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine, which comprises the following specific steps as shown in figures 1-4:
(S1) controlling the thickness of the protective slag layer 18 in the crystallizer 1 30 minutes before the tundish is replaced quickly, accelerating the updating of the protective slag near the submerged nozzle 17, cleaning up the sintering slag blocks in the protective slag layer 18, and cleaning up the protective slag strips 19 attached to the wall 23 of the crystallizer simultaneously, so as to avoid the steel leakage accident caused by the fact that the slag strips are wound into a blank shell after the tundish is replaced;
(S2) before replacing the tundish and after closing the ladle 15, reducing the drawing speed from normal 1.20m/min to 0.4m/min according to a control curve of a graph 4 along with the continuous reduction of molten steel in the old tundish 8, and performing secondary cold water weak cooling control in the process of controlling the drawing speed to avoid the abnormal condition of immovable drawing caused by over-thick thickness and over-high hardness of the casting blank shell 2 during low drawing speed and stopping drawing and straightening;
after the tundish is replaced, the casting blank casting speed is increased to 0.8m/min, and secondary cooling water is controlled to be cooled normally;
(S3), the new tundish 7 at the first preheating position is switched to the old tundish 8 at the casting position by operating the first tundish car 4 and the second tundish car 5, and the first tundish car 4 is driven from the first preheating position to the casting position.
The method also comprises a control process of the automatic driving avoiding roller for re-printing, and the specific steps are as follows:
when the old tundish 8 stops casting, the working mode of the casting machine is switched to a 'mixed casting' mode, and the tail position of the casting blank shell 2 can be automatically marked in the mode, namely the casting blank reprinting position;
with the increase of the casting pulling speed of the new tundish 7, the casting blank is re-printed and enters the fan-shaped section along with the casting blank out of the crystallizer 1;
and before every 2-8 sections of driving roller positions, the system can adjust the lifting of the driving roller according to the marked casting blank reconnection printing position, so that the fractured casting blank reconnection printing or the damage to the driving roller is avoided.
The following can be seen by combining real-time examples 1 to 5: according to the invention, through the adjustment of cooling water of the crystallizer 1, the thickness control of the casting powder and the shrinkage prevention connecting plug-in, the shrinkage of the tail billet in the crystallizer 1 before quick replacement is greatly reduced, the steel infiltration at the lower opening of the casting crystallizer 1 is avoided, and the good connection of new and old casting blanks is realized; by controlling the quick-change forward drawing speed, the secondary cooling strength and the like, the thickness of a formed good tail billet shell is realized, the withdrawal and straightening resistance of the fan-shaped section is reduced, and the casting blank is normally drawn out of the fan-shaped section after quick change;
the method for quickly replacing the ultra-wide thin slab tundish is convenient for personnel to use and operate, reduces the labor intensity, improves the working efficiency, lightens the bonding probability of the casting crystallizer 1, and greatly improves the effective operation rate of an ultra-wide thin slab casting machine.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A method for quickly replacing an online tundish of an ultra-wide thin slab continuous casting machine is characterized by comprising the following steps: the method comprises the following specific steps:
(S1) before replacing the tundish, controlling the thickness of the casting powder layer in the crystallizer, cleaning sintered slag blocks in the casting powder layer, and cleaning casting powder slag strips attached to the wall of the crystallizer;
(S2) before replacing the tundish and after closing the ladle, controlling the pulling speed to fall along with the continuous falling of molten steel in the old tundish, and performing secondary cold water weak cooling control in the pulling speed controlling process;
after the tundish is replaced, controlling the pulling speed to be increased, and controlling the secondary cooling water to be cooled normally;
(S3), switching the new tundish at the first preheating position and the old tundish at the pouring position by starting the first tundish car and the second tundish car, and simultaneously opening the first tundish car from the first preheating position to the pouring position.
2. The method of quickly replacing an on-line tundish of an ultra-wide thin slab caster as recited in claim 1, wherein: the step (S2) of controlling the pulling rate to decrease is to decrease the pulling rate from normal 1.20m/min to 0.4 m/min;
the node for controlling the secondary cold water weak cooling in the step (S2) is that the pulling speed is reduced to 0.8 m/min;
in the step (S2), after the tundish is replaced, the casting blank pulling speed is increased to 0.8 m/min.
3. The method of quickly replacing an on-line tundish of an ultra-wide thin slab caster as recited in claim 1, wherein: the method also comprises a working procedure of preventing the shrinkage of the tail billet shell, and comprises the following specific steps:
after the old tundish at the original casting position stops casting, vertically inserting the shrinkage-proof insert into the casting blank shell and connecting the shrinkage-proof insert with the unset molten steel, wherein the shrinkage-proof insert is supported between the inner arc and the outer arc of the casting blank shell;
controlling the crystallizer, and reducing the cooling water quantity of the crystallizer to 3000 NL/min;
and when the steel ladle containing the molten steel and the new tundish reach the pouring position to prepare for pouring, the water flow of the crystallizer is restored to 5200NL/min which is automatically controlled.
4. The method of quickly replacing an on-line tundish of an ultra-wide thin slab caster as recited in claim 1, wherein: the method also comprises a new tundish submerged nozzle and casting blank control process, and the method comprises the following specific steps:
controlling the tail part of the casting blank shell to descend to a set position through a withdrawal and straightening system during the replacement of a new tundish and an old tundish;
after the new tundish reaches the pouring position, controlling the first tundish car to descend to a set height;
and after the first tundish car carrying the new tundish reaches the pouring position, rotating the ladle turret to transfer the ladle containing the molten steel to be poured to the pouring position.
5. The method of rapidly replacing an on-line tundish of an ultra-wide thin slab caster as recited in claim 4, wherein: in the new tundish submerged nozzle and casting blank control procedure, the withdrawal and straightening system controls the tail of the casting blank shell to descend to a set position, and the set height is as follows: the tail part of the casting blank shell is 350mm away from the upper opening of the crystallizer;
in the new tundish submerged nozzle and casting blank control procedure, after a new tundish reaches a pouring position, a first tundish car is controlled to descend to a set height, and the set height is as follows: the distance from the bottom of the submerged nozzle to the upper surface of the unset molten steel at the tail part of the casting blank shell is 50-60 mm.
6. The method of quickly replacing an on-line tundish of an ultra-wide thin slab caster as recited in claim 1, wherein: the method also comprises a wide-section casting blank reconnection control process, and the method comprises the following specific steps:
opening a steel ladle sliding plate containing molten steel to be poured;
pouring the molten steel into a new tundish, performing full-flow casting on the new tundish when the depth of the molten steel in the new tundish is 200mm, and adding new covering slag when the molten steel is immersed on the upper edge of the side hole of the submerged nozzle;
and starting a casting blank withdrawal and straightening system, pulling a casting blank at a withdrawal speed of 0.3m/min, measuring and calculating the withdrawal speed of the casting blank which is reprinted out of the lower opening of the crystallizer, and gradually increasing the withdrawal speed to 0.8 m/min.
7. The method of quickly replacing an on-line tundish of an ultra-wide thin slab caster as recited in claim 1, wherein: the method also comprises a control process of the automatic driving avoiding roller for re-printing, and the specific steps are as follows:
when the old tundish stops casting, the working mode of the casting machine is switched to a 'mixed casting' mode, and the tail position of the casting blank shell can be automatically marked in the mode, namely the casting blank reconnection position;
with the increase of the casting speed of the new tundish, the casting blank is re-printed and enters the fan-shaped section along with the exit of the casting blank from the crystallizer;
and before every 2-8 sections of driving roller positions, the system can adjust the lifting of the driving roller according to the marked casting blank reconnection printing position, so that the fractured casting blank reconnection printing or the damage to the driving roller is avoided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355945.XA CN114682752A (en) | 2022-04-06 | 2022-04-06 | Method for quickly replacing online tundish of ultra-wide thin slab continuous casting machine |
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Cited By (3)
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| CN115213366A (en) * | 2022-07-22 | 2022-10-21 | 山东钢铁股份有限公司 | Method for quickly replacing steel grade of large-section continuous casting production line |
| CN115401193A (en) * | 2022-09-28 | 2022-11-29 | 山东莱钢永锋钢铁有限公司 | Method for hot exchanging tundish in billet continuous casting machine |
| CN116871470A (en) * | 2023-09-06 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Continuous casting method of round billet continuous casting machine special steel type without connecting billet and connecting piece |
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| CN115213366A (en) * | 2022-07-22 | 2022-10-21 | 山东钢铁股份有限公司 | Method for quickly replacing steel grade of large-section continuous casting production line |
| CN115213366B (en) * | 2022-07-22 | 2024-03-01 | 山东钢铁股份有限公司 | Method for quickly replacing steel grade in large-section continuous casting production line |
| CN115401193A (en) * | 2022-09-28 | 2022-11-29 | 山东莱钢永锋钢铁有限公司 | Method for hot exchanging tundish in billet continuous casting machine |
| CN116871470A (en) * | 2023-09-06 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Continuous casting method of round billet continuous casting machine special steel type without connecting billet and connecting piece |
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