CN113600775A - Slab continuous casting machine slab stagnation rapid treatment method - Google Patents
Slab continuous casting machine slab stagnation rapid treatment method Download PDFInfo
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- CN113600775A CN113600775A CN202110990933.XA CN202110990933A CN113600775A CN 113600775 A CN113600775 A CN 113600775A CN 202110990933 A CN202110990933 A CN 202110990933A CN 113600775 A CN113600775 A CN 113600775A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 96
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000000630 rising effect Effects 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000010009 beating Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000112 cooling gas Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000006748 scratching Methods 0.000 claims description 3
- 230000002393 scratching effect Effects 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005204 segregation 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a slab continuous casting machine slab stagnation rapid treatment method, which comprises the following steps: rapidly inspecting the sector section in a full line, and manually lifting the roll gap of the sector section by 50-100 mm; opening the roller gaps of the clamping rollers of the sections 1, 2 and 3 one by 100-150mm, selecting and removing the sections 2 and 3 from the machine side, trying to pull the blank to see whether to walk, and trying to pull the blank after lifting the drive rollers of the sections 5 if not trying to walk, wherein the operations are required to be completed within half an hour; quickly lifting the non-rotating driving roller to eliminate friction resistance and then starting blank drawing; the roller rotates the unsmooth section, lifts it to make it break away from the casting blank surface and reduce the resistance of drawing blank, depend on the drive roller drawing blank; when a segment which is scratched due to the fact that the roller bearing seat supports against the surface of the casting blank is found, the roll gap of the segment is lifted by about 100 mm; the roll gap value of the fan-shaped section is set to be smaller, the roll gap value of the horizontal section of the casting machine is quickly tracked to the basic roll gap, the basic roll gap with the thickness of 220mm is 225mm, the basic roll gap with the thickness of 250mm is 255mm, and the pressing force of the fan-shaped section on the continuous casting billet is quickly eliminated.
Description
Technical Field
The invention relates to analysis of reasons for a fan-shaped section blank stagnation accident in the production process of a slab caster and a solution method thereof, in particular to a method for rapidly treating blank stagnation of the slab caster.
Background
The slab stagnation of the slab caster is mainly caused by the following aspects: 1. the roller of the sector section does not rotate, the roller and the surface of the casting blank are directly rubbed to scrape off iron oxide scales on the surface of the casting blank and accumulate between the casting blank and the roller, more accumulated objects are accumulated along with the time, the accumulated iron oxide scales are changed into slag blocks with very high density and hardness through opposite extrusion of the casting blank and the roller, and the temperature of the slag blocks is lower than that of the casting blank and the hardness of the slag blocks is higher than that of the casting blank, so that the slag blocks dig off a layer of skin on the surface of the casting blank like a plane cutter to form scratches, the larger the accumulated slag blocks are, the wider and deeper the surface of the casting blank is scratched, the formed blank drawing resistance is larger, and the blank stagnation accident is caused when the resistance is larger than the blank drawing force of the drive roller of the sector section. 2. The radian of the fan-shaped section is abnormal and large to cause that the adjacent upper and lower rollers form large shearing force to the inner and outer arcs of the casting blank between the sections, the blank drawing resistance is greatly increased, the formation reason is that the foundation bolts of the fixed fan-shaped section are stretched and loosened due to the fact that the fan-shaped section is lack of maintenance for a long time or the fan-shaped section is subjected to strong blank drawing, the radian between the sections is infinitely increased, rollers of the adjacent sections form a slab staggering similar to a step, the large shearing force is formed between the upper and lower adjacent rollers of the slab staggering, and slab stagnation accidents are caused when the shearing force is large enough. The drive roller does not rotate due to the fault of a drive motor of a specific sector section or the blockage of a gearbox, the drive roller is pressed on a casting blank according to the given pressure of a system, the blank drawing resistance is increased (the torque of the drive motor is abnormally increased, the torque of a single motor exceeds 70 TRQ), the total torque of the drive motor is different from 850TRQ during blank drawing, the blank drawing force is exerted, the bending stress is increased due to overcooling of the blank after short-time parking, and blank stagnation is caused when the sum of the friction resistance caused by the non-rotating drive roller and the bending stress of the continuous casting blank is larger than the blank drawing force. 4. The bearing failure or lack of lubrication of the sector rollers causes the rollers to rotate and generate difficulty, the blank drawing resistance is increased, the rotation of a single sector is not smooth enough to cause blank stagnation, but the rollers of a plurality of sectors are not flexible enough to cause blank stagnation accidents. 5. The core shaft of the upper frame roller of the sector section is broken, the roller has the reduction range of 1-3mm under the action of soft reduction during blank drawing, the roller is upwards supported by a casting blank during the reduction, and the bearing seat for fixing the core shaft is relatively protruded to press the casting blank to directly rub the casting blank due to the broken core shaft of the roller, so that the blank drawing resistance is increased, the protruded bearing seat can form scratches on the surface of the casting blank when the casting machine is not stopped, but the blank stagnation phenomenon basically cannot occur, but the blank stagnation is likely to form when the straightening stress is increased after the casting machine is temporarily stopped to enable the casting blank to be supercooled. 6. The roll gap value of the sector section is smaller, in order to ensure the internal quality of the continuous casting blank, the roll gap of the sector section is gradually contracted, the contraction is larger, particularly, in order to reduce the segregation casting machine, the horizontal section basically belongs to a static soft reduction state, the sector section is continuously pressed down to cause considerable resistance to blank drawing, and particularly, the lower the temperature of the casting blank, the greater the resistance is formed by difficult compression soft reduction. 7. The continuous casting billet is overcooled due to long stopping time of a casting machine tundish heat exchange and other reasons or water leakage of a fan-shaped roller and other factors, so that the straightening stress of the continuous casting billet is overlarge to cause billet stagnation. 8. The roll gap of the sector section is abnormally smaller or larger due to electrical or mechanical reasons, the continuous casting billet is forcibly flattened by the sector section when the roll gap is smaller, and the billet which is not flattened at the back cannot pass through the sector section with the smaller roll gap value to cause billet stagnation; when the roll gap value is larger, the blank shell is subjected to bulging deformation under the static pressure action of molten steel in the limited space of the close-packed roll without the fan-shaped section on the upper surface of the blank shell, and the bulging deformed blank cannot pass through the fan-shaped section of the normal roll gap to form a blank stagnation. 9. When steel leakage occurs during casting or tail billet is discharged, accidents such as tail billet rising and the like do not occur well during capping, so that the continuous casting billet and the segment roller are adhered together to cause blank stagnation. The roller of the sector section does not rotate, the roller and the surface of the casting blank are directly rubbed to scrape off iron oxide scales on the surface of the casting blank and accumulate between the casting blank and the roller, more accumulated objects are accumulated along with the time, the accumulated iron oxide scales are changed into slag blocks with very high density and hardness through opposite extrusion of the casting blank and the roller, and the temperature of the slag blocks is lower than that of the casting blank and the hardness of the slag blocks is higher than that of the casting blank, so that the slag blocks dig off a layer of skin on the surface of the casting blank like a plane cutter to form scratches, the larger the accumulated slag blocks are, the wider and deeper the surface of the casting blank is scratched, the formed blank drawing resistance is larger, and the blank stagnation accident is caused when the resistance is larger than the blank drawing force of the drive roller of the sector section.
Disclosure of Invention
The invention aims to provide a slab stagnation rapid treatment method for a slab continuous casting machine, which can avoid slab stagnation accidents and ensure normal production.
The technical scheme adopted by the invention is as follows: a slab continuous casting machine slab stagnation rapid treatment method comprises the following steps: 1. rapidly inspecting the sector section in a full-line manner, manually lifting the roll gap of the sector section by 50-100mm at the machine side in a maintenance mode when a large slag accumulation casting blank is scratched between the rollers of the sector section, rapidly cleaning the slag block, and restarting to perform blank drawing; 2. in order to eliminate the shearing force formed by the upper and lower rollers between adjacent sections on the casting blank, the roller gaps of the clamping rollers of the sections 1, 2 and 3 are opened one by 100-150mm, the sections 2 and 3 are selected and removed from the machine side, the drive is tried to pull the blank to see whether the blank is moved, if the drive is not tried to be moved and then the drive rollers of the sections 5 are lifted, the blank is tried to be pulled, and the operations are completed within half an hour; 3. quickly lifting the non-rotating driving roller to eliminate friction resistance and then starting blank drawing; 4. the roller rotates the unsmooth section, lifts it to make it break away from the casting blank surface and reduce the resistance of drawing blank, depend on the drive roller drawing blank; 5. checking the sector section, lifting a roll gap of the sector section by about 100mm when a roller bearing seat is found to abut against the section which is scratched on the surface of the casting blank, lifting the driving roller if the roller bearing seat is the cause of the driving roller, opening the roll gap to remove the pressure on the casting blank no matter whether the scratching position is on the inner arc side or the outer arc side, and pulling the casting blank out of the sector section after starting the blank drawing; 6. setting the roll gap value of the sector section to be smaller, quickly tracking the roll gap value of the horizontal section of the casting machine to a basic roll gap, wherein the basic roll gap with the thickness of 220mm is 225mm, the basic roll gap with the thickness of 250mm is 255mm, quickly eliminating the pressing force of the sector section on the continuous casting blank, and then lifting the roll gap of the section causing larger friction force for the running of the casting blank to normally draw the blank; 7. the shutdown time is long due to the heat exchange of a tundish of a casting machine and the like, or continuous casting billets are overcooled due to factors such as water leakage of a roller at a sector section, so that the straightening stress of the casting billets is overlarge to cause billet stagnation; the steps 2 and 6 are adopted to reduce the withdrawal resistance and quickly withdraw the continuous casting billet; 8. the roll gap of the sector section is abnormally smaller or larger due to electrical or mechanical reasons, the continuous casting billet is forcibly flattened by the sector section when the roll gap is smaller, and the billet which is not flattened at the back cannot pass through the sector section with the smaller roll gap value to cause billet stagnation; rapidly checking the roll gap value of the sector segment, rapidly beating the sector segment with abnormal roll gap to a forced manual state to manually intervene the roll gap, manually lifting the segment with smaller roll gap value until the roll gap value is set, and not immediately pressing down the segment with larger roll gap to prevent the unsolidified molten steel from being extruded, and only lifting the roll gap of the sector segment to be passed by segment while pulling the billet until the casting blank is completely pulled out of the sector segment; 9. when steel leakage occurs during casting or tail billet is produced, accidents such as tail billet rising and the like do not occur well during capping, so that the continuous casting billet and the segment roller are adhered together to cause billet stagnation; if the adhesion between the continuous casting blank and the roller is small due to steel leakage and rising, the casting blank is tried to be restarted and pulled, if the casting blank can run, the pulling speed is increased to 1.2 m/min of the casting blank, if the casting blank is still pulled still, secondary cooling water and gas are quickly closed in order to prevent the casting blank from being cooled too fast, the casting blank is directly cut off by a cutting knife between the branch guide section and the first section, and the casting blank can be pulled out of the fan-shaped section when the casting blank is still hot.
In summary, the invention is primarily intended to quickly find the point of failure in minutes and seconds, since the higher the temperature the lower the straightening force required for the strand, the lower the withdrawal resistance. It is not effective to take all measures when the surface of the slab has cooled and blackened. In order to protect the precision of a continuous casting machine, violent forced blank drawing is firmly avoided, and when the surface temperature of a casting blank is too low or the blank drawing is ineffective after multiple attempts, only a blank freezing treatment program can be started. Therefore, when a slab stagnation accident happens, if the reason of slab stagnation can not be quickly confirmed, the secondary cold water and the secondary cold air must be firstly closed, the fan-shaped section is cooled by the cooling water of the casting machine fan-shaped section roller, so that the temperature drop speed of the continuous casting slab is the lowest, and after the continuous casting slab is effectively pulled by taking measures, the cooling water and the compressed air of the section through which the tail slab passes must be started to quickly cool the fan-shaped section to protect the fan-shaped section.
The invention relates to a method for analyzing and solving the reason of slab stagnation in the production of slabs, which can control the working condition of a continuous casting machine in real time in advance through analysis, avoid slab stagnation accidents, quickly find out the fault reason of the slab stagnation accidents and rapidly process the slab stagnation accidents by adopting a symptomatic method, avoid the irreversible damage to the whole casting machine caused by forced slab withdrawal by an incorrect processing method, improve the working efficiency and reduce the consumption of manpower and material resources. The method is suitable for the same type of continuous casting machine, can improve the operation stability, greatly reduce the accident handling time of the continuous casting machine, improve the operation rate of the casting machine and reduce the production cost of the continuous casting machine.
Detailed Description
A slab continuous casting machine slab stagnation rapid treatment method comprises the following steps: 1. rapidly inspecting the sector section in a full-line manner, manually lifting the roll gap of the sector section by 50-100mm at the machine side in a maintenance mode when a large slag accumulation casting blank is scratched between the rollers of the sector section, rapidly cleaning the slag block, and restarting to perform blank drawing; 2. in order to eliminate the shearing force formed by the upper and lower rollers between adjacent sections on the casting blank, the roller gaps of the clamping rollers of the sections 1, 2 and 3 are opened one by 100-150mm, the sections 2 and 3 are selected and removed from the machine side, the drive is tried to pull the blank to see whether the blank is moved, if the drive is not tried to be moved and then the drive rollers of the sections 5 are lifted, the blank is tried to be pulled, and the operations are completed within half an hour; 3. quickly lifting the non-rotating driving roller to eliminate friction resistance and then starting blank drawing; 4. the roller rotates the unsmooth section, lifts it to make it break away from the casting blank surface and reduce the resistance of drawing blank, depend on the drive roller drawing blank; 5. checking the sector section, lifting a roll gap of the sector section by about 100mm when a roller bearing seat is found to abut against the section which is scratched on the surface of the casting blank, lifting the driving roller if the roller bearing seat is the cause of the driving roller, opening the roll gap to remove the pressure on the casting blank no matter whether the scratching position is on the inner arc side or the outer arc side, and pulling the casting blank out of the sector section after starting the blank drawing; 6. setting the roll gap value of the sector section to be smaller, quickly tracking the roll gap value of the horizontal section of the casting machine to a basic roll gap, wherein the basic roll gap with the thickness of 220mm is 225mm, the basic roll gap with the thickness of 250mm is 255mm, quickly eliminating the pressing force of the sector section on the continuous casting blank, and then lifting the roll gap of the section causing larger friction force for the running of the casting blank to normally draw the blank; 7. the shutdown time is long due to the heat exchange of a tundish of a casting machine and the like, or continuous casting billets are overcooled due to factors such as water leakage of a roller at a sector section, so that the straightening stress of the casting billets is overlarge to cause billet stagnation; the steps 2 and 6 are adopted to reduce the withdrawal resistance and quickly withdraw the continuous casting billet; 8. the roll gap of the sector section is abnormally smaller or larger due to electrical or mechanical reasons, the continuous casting billet is forcibly flattened by the sector section when the roll gap is smaller, and the billet which is not flattened at the back cannot pass through the sector section with the smaller roll gap value to cause billet stagnation; rapidly checking the roll gap value of the sector segment, rapidly beating the sector segment with abnormal roll gap to a forced manual state to manually intervene the roll gap, manually lifting the segment with smaller roll gap value until the roll gap value is set, and not immediately pressing down the segment with larger roll gap to prevent the unsolidified molten steel from being extruded, and only lifting the roll gap of the sector segment to be passed by segment while pulling the billet until the casting blank is completely pulled out of the sector segment; 9. when steel leakage occurs during casting or tail billet is produced, accidents such as tail billet rising and the like do not occur well during capping, so that the continuous casting billet and the segment roller are adhered together to cause billet stagnation; if the adhesion between the continuous casting blank and the roller is small due to steel leakage and rising, the casting blank is tried to be restarted and pulled, if the casting blank can run, the pulling speed is increased to 1.2 m/min of the casting blank, if the casting blank is still pulled still, secondary cooling water and gas are quickly closed in order to prevent the casting blank from being cooled too fast, the casting blank is directly cut off by a cutting knife between the branch guide section and the first section, and the casting blank can be pulled out of the fan-shaped section when the casting blank is still hot.
Claims (1)
1. A slab continuous casting machine slab stagnation rapid processing method is characterized by comprising the following steps: 1. rapidly inspecting the sector section in a full-line manner, manually lifting the roll gap of the sector section by 50-100mm at the machine side in a maintenance mode when a large slag accumulation casting blank is scratched between the rollers of the sector section, rapidly cleaning the slag block, and restarting to perform blank drawing; 2. in order to eliminate the shearing force formed by the upper and lower rollers between adjacent sections on the casting blank, the roller gaps of the clamping rollers of the sections 1, 2 and 3 are opened one by 100-150mm, the sections 2 and 3 are selected and removed from the machine side, the drive is tried to pull the blank to see whether the blank is moved, if the drive is not tried to be moved and then the drive rollers of the sections 5 are lifted, the blank is tried to be pulled, and the operations are completed within half an hour; 3. quickly lifting the non-rotating driving roller to eliminate friction resistance and then starting blank drawing; 4. the roller rotates the unsmooth section, lifts it to make it break away from the casting blank surface and reduce the resistance of drawing blank, depend on the drive roller drawing blank; 5. checking the sector section, lifting a roll gap of the sector section by about 100mm when a roller bearing seat is found to abut against the section which is scratched on the surface of the casting blank, lifting the driving roller if the roller bearing seat is the cause of the driving roller, opening the roll gap to remove the pressure on the casting blank no matter whether the scratching position is on the inner arc side or the outer arc side, and pulling the casting blank out of the sector section after starting the blank drawing; 6. setting the roll gap value of the sector section to be smaller, quickly tracking the roll gap value of the horizontal section of the casting machine to a basic roll gap, wherein the basic roll gap with the thickness of 220mm is 225mm, the basic roll gap with the thickness of 250mm is 255mm, quickly eliminating the pressing force of the sector section on the continuous casting blank, and then lifting the roll gap of the section causing larger friction force for the running of the casting blank to normally draw the blank; 7. the shutdown time is long due to the heat exchange of a tundish of a casting machine and the like, or continuous casting billets are overcooled due to factors such as water leakage of a roller at a sector section, so that the straightening stress of the casting billets is overlarge to cause billet stagnation; the steps 2 and 6 are adopted to reduce the withdrawal resistance and quickly withdraw the continuous casting billet; 8. the roll gap of the sector section is abnormally smaller or larger due to electrical or mechanical reasons, the continuous casting billet is forcibly flattened by the sector section when the roll gap is smaller, and the billet which is not flattened at the back cannot pass through the sector section with the smaller roll gap value to cause billet stagnation; rapidly checking the roll gap value of the sector segment, rapidly beating the sector segment with abnormal roll gap to a forced manual state to manually intervene the roll gap, manually lifting the segment with smaller roll gap value until the roll gap value is set, and not immediately pressing down the segment with larger roll gap to prevent the unsolidified molten steel from being extruded, and only lifting the roll gap of the sector segment to be passed by segment while pulling the billet until the casting blank is completely pulled out of the sector segment; 9. when steel leakage occurs during casting or tail billet is produced, accidents such as tail billet rising and the like do not occur well during capping, so that the continuous casting billet and the segment roller are adhered together to cause billet stagnation; if the adhesion between the continuous casting blank and the roller is small due to steel leakage and rising, the casting blank is tried to be restarted and pulled, if the casting blank can run, the pulling speed is increased to 1.2 m/min of the casting blank, if the casting blank is still pulled still, secondary cooling water and gas are quickly closed in order to prevent the casting blank from being cooled too fast, the casting blank is directly cut off by a cutting knife between the branch guide section and the first section, and the casting blank can be pulled out of the fan-shaped section when the casting blank is still hot.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110990933.XA CN113600775A (en) | 2021-08-26 | 2021-08-26 | Slab continuous casting machine slab stagnation rapid treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110990933.XA CN113600775A (en) | 2021-08-26 | 2021-08-26 | Slab continuous casting machine slab stagnation rapid treatment method |
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| CN113600775A true CN113600775A (en) | 2021-11-05 |
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| CN202110990933.XA Pending CN113600775A (en) | 2021-08-26 | 2021-08-26 | Slab continuous casting machine slab stagnation rapid treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589295A (en) * | 2022-03-08 | 2022-06-07 | 宝钢湛江钢铁有限公司 | Roll gap adjusting method for casting machine for abnormal final casting of slab continuous casting |
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| CN114589295B (en) * | 2022-03-08 | 2024-02-27 | 宝钢湛江钢铁有限公司 | Roller gap adjusting method for casting machine for abnormal final casting of slab continuous casting |
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