CN104889354B - Method for controlling torque of withdrawing and straightening machines for improving screw-down effects for solidification tail ends of continuous casting slabs - Google Patents
Method for controlling torque of withdrawing and straightening machines for improving screw-down effects for solidification tail ends of continuous casting slabs Download PDFInfo
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- CN104889354B CN104889354B CN201510304514.0A CN201510304514A CN104889354B CN 104889354 B CN104889354 B CN 104889354B CN 201510304514 A CN201510304514 A CN 201510304514A CN 104889354 B CN104889354 B CN 104889354B
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Abstract
The invention relates to a method for controlling torque of withdrawing and straightening machines for improving screw-down effects for solidification tail ends of continuous casting slabs. The method includes enabling various frequency converters to acquire actual output torque of corresponding driving rolls in real time in continuous casting slab solidification procedures; computing total output torque of current casting flow; uniformly distributing load factors of the various driving rolls according to the number of the withdrawing and straightening machines when the various withdrawing and straightening machines output equal force for withdrawing and casting the continuous casting slabs in the continuous casting slab solidification procedures; setting output torque of the various driving rolls as products of the total output torque and the corresponding load factors of the various driving rolls; setting load factors of the various driving rolls according to screw-down regions of the different continuous casting slabs when the various withdrawing and straightening machines output unequal force for withdrawing and casting the continuous casting slabs in the continuous casting slab solidification procedures, and determining set output torque of the various driving rolls; adjusting the rotational speeds of the various driving rolls according to deviation of the set output torque and the actual output torque of the various driving rolls.
Description
Technical field
The invention belongs to bloom, sheet billet continuous casting production field are and in particular to a kind of improve continuous casting billet solidifying end pressure
The withdrawal straightening machine torque control method of effect.
Background technology
Continuous casting billet dynamic soft-reduction is to improve continuous casting billet center segregation and loose effective Technology, and its implementation principle exists
In: it is applied around pressure (thermal stress and mechanical stress) and produces certain drafts and hinder containing by solidifying latter stage in continuous casting billet
The molten steel flow of enrichment segregation element thus eliminating center segregation, dredged with eliminating center by the solidification shrinkage amount simultaneously compensating continuous casting billet
Pine.Pressure range refers to the enforcing location of slighter compress, how to be represented using strand center solid rate；Drafts is to determine that pressure is implemented
How many important parameters, the drafts in unit distance is typically represented with reduction ratio.According to the difference of casting condition, depress area
Between, drafts/Soft Reduction Gradient is also not quite similar.
With the broadening thickening of casting blank section, the green shell drag depressing process dramatically increases, therefore for reaching solute segregation
Molten steel extruding exclusion, improves the pressure effect of strand consistency, solidification end drafts certainly will increase.However, in pressure process
In, in addition to pressed compact power, strand certainly will also suffer from the power in throwing direction.Casting billet surface drafts is in solid liquid interface transmittance process
Major part is dissipated in strand and spreads and extend in deformation.Therefore, control strand to extend to strain, make strand be in " piling of steel " pressure
State, can effectively improve soft reduction process effect it is ensured that drafts can effectively be transferred to wick-containing, the technique being really achieved extruding wick-containing
Effect.In actual production process, by controlling each driven roller rotating speed, the indirect control of achievable driven roller moment of torsion.Therefore, drive
Roller moment of torsion control technology is to realize strand " piling of steel pressure " it is ensured that drafts is effectively transferred to the effective means of wick-containing.
Symmetrical load or equilibrium pulling rate method is mostly adopted to control driven roller moment of torsion, that is, according to setting at present in casting process
Pulling rate equilibrium assignment each withdrawal straightening machine moment of torsion.The method that partial monopoly give also moment of torsion control, such as cn104001886a are passed through to draw
Enter sharing of load coefficient and achieve withdrawal straightening stands total load freely distributing on each withdrawal straightening machine, adjusted by closed loop and achieve
The automatically controlling of throwing power；Patent cn101648264a depresses the moment of torsion distribution leading to during aiming to solve the problem that bloom slighter compress
Uneven.Above-mentioned patent is proposed the control method to driven roller moment of torsion in continuous casting production process, but does not all prolong from reduction strand
Exhibition deformation, improves soft reduction process effect angle design driving torque distribution method.
Content of the invention
For the deficiencies in the prior art, the present invention proposes a kind of withdrawal straightening machine improving continuous casting billet solidifying end pressure effect and turns round
Square control method.
A kind of withdrawal straightening machine torque control method improving continuous casting billet solidifying end pressure effect, comprises the following steps:
Step 1: in continuous casting billet solidification processing, the corresponding driven roller of each converter Real-time Collection of tension leveller of continuous casting machine system
Reality output moment of torsion For the reality output moment of torsion of i-th driven roller, n is that current casting stream participation is negative
The driven roller number of units of lotus distribution, calculates total output torque of this casting stream current
Step 2: determine the setting output torque of each driven roller according to total output torque of this casting stream current
Step 2.1: when withdrawal straightening machine equalization each in continuous casting billet solidification processing exerts oneself cast, the load of each driven roller because
Number according to withdrawal straightening machine number mean allocation, each driven roller set output torque as its corresponding load of total output torque because
The product of number；
Step 2.2: when withdrawal straightening machine each in continuous casting billet solidification processing is unequal exert oneself cast when, according to different continuous casting billet pressures
Lower region sets the load-factor of each driven roller, determines the setting output torque of each driven roller；
Step 2.2.1: when withdrawal straightening machine each in continuous casting billet solidification processing is unequal exert oneself cast when, set continuous casting billet different
The load-factor in region: set the load-factor before region depressed by continuous casting billet as account for full payload 50%～150%, set continuous casting
The load-factor that base is depressed in region is account for full payload -50%～100%, sets the load-factor after region depressed by continuous casting billet
For accounting for -50%～the 50% of full payload, the load-factor summation in each region of continuous casting billet is 100%；
Step 2.2.2: in continuous casting billet pressure region, calculated in continuous casting billet pressure region according to each driven roller drafts
The setting output torque of each withdrawal straightening machine:Wherein, μ=1,2...m, m depress region for continuous casting billet
Interior driven roller number of units, εμDepress the setting output torque of μ platform withdrawal straightening machine in region, g for continuous casting billetμDepress area for continuous casting billet
The control gain of the output torque of μ platform withdrawal straightening machine in domain；rμDepress μ platform withdrawal straightening machine or fan-shaped section in region for continuous casting billet
Drafts, rallDepress total amount in continuous casting billet pressure region；
Step 2.2.3: before continuous casting billet pressure region and behind continuous casting billet pressure region, the setting output of each driven roller is turned round
Square is the product of total output torque and each driven roller load-factor；
Step 2.3: set maximum setting output torque tmax, when the setting output torque of driven rollerSet more than maximum
Output torque tmaxWhen, then set output torque t by maximummaxSetting output torque as this driven roller；
Step 3: set the deviation of output torque and reality output moment of torsion according to each driven rollerEach driven roller rotating speed is entered
Row adjustment:
Step 3.1: calculate the deviation that each driven roller sets output torque and reality output moment of torsionAccording to
This deviationEach driven roller rotating speed is progressively adjusted with setting fine setting rotating speed；
Step 3.2: whether the driven roller rotating speed after judging to adjust and the initial deviation setting pulling rate exceed initial setting is drawn
± the 20% of speed, if so, then no longer adjusts driven roller rotating speed, otherwise, execution step 3.3；
Step 3.3: judge whether the output torque of driven roller reaches the setting output torque of this driven roller, if so, no longer
Adjustment driven roller rotating speed, otherwise, return to step 3.1.
Described sets fine setting rotating speed as -0.20～0.20m/min.
The invention has the beneficial effects as follows:
The present invention proposes to be applied to a kind of raising continuous casting billet solidifying end pressure effect of bloom, sheet billet continuous casting production field
The withdrawal straightening machine torque control method of fruit, on the contact position of driven roller and strand, strand is subject to the dual of frictional force and pressure
Effect, as shown in Figure 1.Wherein frictional force general direction is throwing direction, and that is, frictional force drives strand moves ahead；Pressure mass action
Direction is pressed compact direction, even if solid liquid interface deforms and plays the effect that solidification end is depressed.When throwing power is excessive, now cast
Base Impact direction tends to level, and strand is deformed into primary deformable direction to extend.Therefore, reduce throwing power and can significantly reduce strand
Extending and deform, making strand more they tend to compression, thus improving pressure effect.Therefore, it is an advantage of the current invention that passing through to improve
Each withdrawal straightening machine output torque, strand tension force between effective control each driven roller, make the strand during pressure more they tend to compression,
Thus lifting Inner Quality of Billet.
Brief description
Fig. 1 is that the casting blank deformation of the continuous casting billet solidifying end pressure process in the specific embodiment of the invention is divided with stress
Analysis；
Fig. 2 is the withdrawal straightening machine moment of torsion control improving continuous casting billet solidifying end pressure effect in the specific embodiment of the invention
The flow chart of method.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the invention is described in detail.
The present invention is applied to certain steel mill 380mm × 490mm large square bland continuous-casting machine, and it has 12 withdrawal straightening machines, wherein can depress
Withdrawal straightening machine 10, to produce based on the middle and high carbon alloy steel such as bearing steel, cold-forging steel.In wherein 2#～9#, 11#, 12# withdrawal straightening machine
Arc is provided with driven roller, in the present embodiment, initially sets pulling rate as 0.5m/min, and casting steel grade is gcr15 bearing steel.
A kind of withdrawal straightening machine torque control method improving continuous casting billet solidifying end pressure effect, as shown in Fig. 2 include following
Step:
Step 1: in continuous casting billet solidification processing, the corresponding driven roller of each converter Real-time Collection of tension leveller of continuous casting machine system
Reality output moment of torsion For the reality output moment of torsion of i-th driven roller, n is that current casting stream participation is negative
The driven roller number of units of lotus distribution, calculates total output torque of this casting stream current
In present embodiment, driven roller number of units n that current casting stream participates in sharing of load is 10, and Real-time Collection drives accordingly
The reality output moment of torsion of rollerNumerical value is: 21.8nm, 22.5nm, 22.2nm, 22.1nm, 22.7nm,
22.7nm、21.6nm、20.9nm、23.2nm、21.9nm.
Then total output torque in this casting stream a certain momentFor 221.6nm.
Step 2: determine the setting output torque of each driven roller according to total output torque of this casting stream current
Step 2.1: when withdrawal straightening machine equalization each in continuous casting billet solidification processing exerts oneself cast, the load of each driven roller because
Number according to withdrawal straightening machine number mean allocation, each driven roller set output torque as its corresponding load of total output torque because
The product of number.
In present embodiment, when withdrawal straightening machine equalization each in continuous casting billet solidification processing exerts oneself cast, each driven roller
Load-factor is 10% it is contemplated that production process fluctuation etc. affects according to withdrawal straightening machine number mean allocation, each driven roller
Set output torque and be about 20.0～25.0nm.
Step 2.2: when withdrawal straightening machine each in continuous casting billet solidification processing is unequal exert oneself cast when, according to different continuous casting billet pressures
Lower region sets the load-factor of each driven roller, determines the setting output torque of each driven roller.
Step 2.2.1: when withdrawal straightening machine each in continuous casting billet solidification processing is unequal exert oneself cast when, set continuous casting billet different
The load-factor in region: set the load-factor before region depressed by continuous casting billet as account for full payload 50%～150%, set continuous casting
The load-factor that base is depressed in region is account for full payload -50%～100%, sets the load-factor after region depressed by continuous casting billet
For accounting for -50%～the 50% of full payload, the load-factor summation in each region of continuous casting billet is 100%.
In present embodiment, when 1486～1496 DEG C of cast temperatures with 0.5m/min pulling rate under the conditions of produce bearing steel
During gcr15, continuous casting billet pressure region is located between 5#～8# withdrawal straightening machine.
Set the load-factor of the 2#～4# driven roller before region depressed by continuous casting billet as account for full payload 75%, set even
The load-factor that the 5#～8# driven roller in region depressed by strand is account for full payload 19%, after setting continuous casting billet pressure region
The load-factor of 9#, 11#, 12# driven roller be account for full payload 6%, the load-factor summation in each region of continuous casting billet is
100%.
Step 2.2.2: in continuous casting billet pressure region, calculated in continuous casting billet pressure region according to each driven roller drafts
The setting output torque of each withdrawal straightening machine:Wherein, μ=1,2...m, m depress region for continuous casting billet
Interior driven roller number of units, εμDepress the setting output torque of μ platform withdrawal straightening machine in region, g for continuous casting billetμDepress area for continuous casting billet
The control gain of the output torque of μ platform withdrawal straightening machine, r in domainμDepress μ platform withdrawal straightening machine or fan-shaped section in region for continuous casting billet
Drafts, rallDepress total amount in continuous casting billet pressure region.
In present embodiment, continuous casting billet pressure region is located between 5#～8# withdrawal straightening machine, then in continuous casting billet pressure region
Driven roller number of units m=4, according to patent zl200910187338.1, " a kind of bloom continuous-casting dynamic gentle pressure amount is in line traffic control
Method processed " calculate the drafts that withdrawal straightening machine 5#～8# in region depressed by continuous casting billet, 5#～8# withdrawal straightening machine in continuous casting billet pressure region
Output torque control gain be -50～+50 rate mu-factor, then according to each driven roller drafts calculate continuous casting billet pressure
The setting output torque of the 5#～8# withdrawal straightening machine in lower region is about 38.8nm, 37.9nm, -12.4nm, -14.3nm.
Step 2.2.3: before continuous casting billet pressure region and behind continuous casting billet pressure region, the setting output of each driven roller is turned round
Square is the product of total output torque and each driven roller load-factor.
In present embodiment, the setting output torque of the 2#～4# driven roller before region depressed by continuous casting billet respectively may be about
57.8nm, 54.5nm, 55.3nm, the setting output torque of 9#, 11#, 12# driven roller after region depressed by continuous casting billet is respectively about
For 2.2nm, 3.7nm, 3.7nm, total output torque in this casting stream a certain moment is 227.2nm.
Step 2.3: set maximum setting output torque tmax, when the setting output torque of driven rollerSet more than maximum
Output torque tmaxWhen, then set output torque t by maximummaxSetting output torque as this driven roller.
In present embodiment, maximum setting output torque tmaxFor 350nm.
Step 3: set the deviation of output torque and reality output moment of torsion according to each driven rollerEach driven roller rotating speed is entered
Row adjustment.
Step 3.1: calculate the deviation that each driven roller sets output torque and reality output moment of torsionAccording to
This deviationEach driven roller rotating speed is progressively adjusted with setting fine setting rotating speed.
In present embodiment, set fine setting rotating speed as -0.10m/min～0.10m/min.
Step 3.2: whether the driven roller rotating speed after judging to adjust and the initial deviation setting pulling rate exceed initial setting is drawn
± the 20% of speed, if so, then no longer adjusts driven roller rotating speed, otherwise, execution step 3.3.
Step 3.3: judge whether the output torque of driven roller reaches the setting output torque of this driven roller, if so, no longer
Adjustment driven roller rotating speed, otherwise, return to step 3.1.
In present embodiment, after being adjusted, each withdrawal straightening machine sharing of load factor, setting output torque and setting straightening
Machine pulling rate is as shown in table 1:
The each withdrawal straightening machine sharing of load factor of table 1, setting output torque and setting withdrawal straightening machine pulling rate
After technology implementation, produce slab quality effect and significantly improve, center porosity reduces by 1.0 grades about with shrinkage cavity defect.
Claims (3)
1. a kind of continuous casting billet solidifying end that improves depresses the withdrawal straightening machine torque control method of effect it is characterised in that including following
Step:
Step 1: in continuous casting billet solidification processing, the reality of the corresponding driven roller of each converter Real-time Collection of tension leveller of continuous casting machine system
Border output torqueFor the reality output moment of torsion of i-th driven roller, n is that current casting stream participation load divides
The driven roller number of units joined, calculates total output torque of this casting stream current
Step 2: determine the setting output torque of each driven roller according to total output torque of this casting stream current
Step 2.1: when withdrawal straightening machine equalization each in continuous casting billet solidification processing exerts oneself cast, the load-factor of each driven roller is pressed
According to withdrawal straightening machine number mean allocation, each driven roller set output torque as its corresponding load-factor of total output torque
Product；
Step 2.2: when withdrawal straightening machine each in continuous casting billet solidification processing is unequal exert oneself cast when, according to different continuous casting billets depress area
Domain sets the load-factor of each driven roller, determines the setting output torque of each driven roller；
Step 2.2.1: when withdrawal straightening machine each in continuous casting billet solidification processing is unequal exert oneself cast when, set continuous casting billet zones of different
Load-factor: set continuous casting billet depress region before load-factor as account for full payload 50%～150%, set continuous casting billet pressure
Load-factor in lower region is account for full payload -50%～100%, sets the load-factor after region depressed by continuous casting billet as accounting for
- the 50% of full payload～50%, the load-factor summation in each region of continuous casting billet is 100%；
Step 2.2.2: in continuous casting billet pressure region, continuous casting billet is calculated according to each driven roller drafts and depresses each in region
The setting output torque of withdrawal straightening machine；
Step 2.2.3: continuous casting billet pressure region before and continuous casting billet pressure region after, each driven roller set output torque as
Total output torque and the product of each driven roller load-factor；
Step 2.3: set maximum setting output torque tmax, when the setting output torque of driven rollerSet output more than maximum
Moment of torsion tmaxWhen, then set output torque t by maximummaxSetting output torque as this driven roller；
Step 3: set the deviation of output torque and reality output moment of torsion according to each driven rollerEach driven roller rotating speed is adjusted
Whole；
Step 3.1: calculate the deviation that each driven roller sets output torque and reality output moment of torsionInclined according to this
DifferenceEach driven roller rotating speed is progressively adjusted with setting fine setting rotating speed；
Step 3.2: the driven roller rotating speed after judging to adjust initially sets pulling rate with whether the initial deviation setting pulling rate exceedes
± 20%, if so, then no longer adjust driven roller rotating speed, otherwise, execution step 3.3；
Step 3.3: judge whether the output torque of driven roller reaches the setting output torque of this driven roller, if so, no longer adjust
Driven roller rotating speed, otherwise, return to step 3.1.
2. the withdrawal straightening machine torque control method improving continuous casting billet solidifying end pressure effect according to claim 1, it is special
Levy and be, described calculates, according to each driven roller drafts, the setting output torque that each withdrawal straightening machine in region depressed by continuous casting billet
Method particularly includes:Wherein, μ=1,2 ... m, m depress the driven roller number of units in region for continuous casting billet,
εμDepress the setting output torque of μ platform withdrawal straightening machine in region, g for continuous casting billetμFor μ platform withdrawal straightening machine in continuous casting billet pressure region
Output torque control gain, rμDepress the drafts of μ platform withdrawal straightening machine or fan-shaped section in region, r for continuous casting billetallFor even
Strand pressure depresses total amount in region.
3. the withdrawal straightening machine torque control method improving continuous casting billet solidifying end pressure effect according to claim 1, it is special
Levy and be, described sets fine setting rotating speed as -0.20～0.20m/min.
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| CN201510304514.0A CN104889354B (en) | 2015-06-05 | 2015-06-05 | Method for controlling torque of withdrawing and straightening machines for improving screw-down effects for solidification tail ends of continuous casting slabs |
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| CN201510304514.0A CN104889354B (en) | 2015-06-05 | 2015-06-05 | Method for controlling torque of withdrawing and straightening machines for improving screw-down effects for solidification tail ends of continuous casting slabs |
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| CN104889354B true CN104889354B (en) | 2017-01-18 |
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| CN107138700A (en) * | 2017-04-01 | 2017-09-08 | 河钢股份有限公司承德分公司 | A kind of method of without gap sensors continuous casting machine fan-shaped segment control |
| CN113523214B (en) * | 2021-06-18 | 2022-09-09 | 首钢集团有限公司 | Slab throwing force distribution method for continuous casting high-reduction process |
| CN113798460B (en) * | 2021-09-01 | 2022-11-25 | 中冶南方连铸技术工程有限责任公司 | Tension leveler system and method for adjusting load coefficient of tension leveler transmission device |
| CN114817830B (en) * | 2022-06-27 | 2022-09-06 | 山东钢铁股份有限公司 | Accurate prediction method for solidification tail end of casting blank |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS564363A (en) * | 1979-06-22 | 1981-01-17 | Nippon Steel Corp | Continuous casting method of slab |
| JPS59225866A (en) * | 1983-06-07 | 1984-12-18 | Nippon Steel Corp | Control device for drawing of billet with continuous casting installation |
| JPH07108359A (en) * | 1993-10-08 | 1995-04-25 | Aichi Steel Works Ltd | Device for monitoring friction force between continuous casting mold and cast slab |
| CN100561383C (en) * | 2006-10-25 | 2009-11-18 | 上海梅山钢铁股份有限公司 | The cooling of sheet billet continuous casting secondary reaches dynamically gently depresses off-line emulation system |
| CN101362195B (en) * | 2008-09-12 | 2010-11-10 | 攀钢集团研究院有限公司 | Bloom continuous-casting dynamic gentle pressure amount control method |
| CN101642774B (en) * | 2009-09-15 | 2011-10-05 | 邢台钢铁有限责任公司 | GCr15 bearing steel bloom continuous casting dynamic soft reduction process |
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Application publication date: 20150909 Assignee: MCC SOUTHERN CONTINUOUS CASTING TECHNOLOGY ENGINEERING Co.,Ltd. Assignor: Northeastern University Contract record no.: X2020210000038 Denomination of invention: A torque control method for tension leveller to improve the reduction effect of solidification end of continuous casting slab Granted publication date: 20170118 License type: Common License Record date: 20201223 |
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