CN101648264A - Method for distributing and controlling tension leveler torque in bloom continuous casting dynamic soft reduction process - Google Patents
Method for distributing and controlling tension leveler torque in bloom continuous casting dynamic soft reduction process Download PDFInfo
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- CN101648264A CN101648264A CN200910075406A CN200910075406A CN101648264A CN 101648264 A CN101648264 A CN 101648264A CN 200910075406 A CN200910075406 A CN 200910075406A CN 200910075406 A CN200910075406 A CN 200910075406A CN 101648264 A CN101648264 A CN 101648264A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000009749 continuous casting Methods 0.000 title claims abstract description 24
- 238000011946 reduction process Methods 0.000 title claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 abstract description 16
- 230000001276 controlling effect Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 230000000881 depressing effect Effects 0.000 description 14
- 230000000994 depressogenic effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The invention relates to a method for distributing and controlling tension leveler torque in a bloom continuous casting dynamic soft reduction process, belonging to the technical field of metallurgy continuous casting and used for solving the problem of uneven torque distribution of a tension leveler when the tension leveler implements dynamic soft reduction. The invention adopts the technical scheme of selecting measuring rollers; calculating a set value of torque of each drive roller; and comparing a set value with an actual measured value of the torque of each drive roller, and carrying outcasting speed regulation. The three steps are continuously carried out in a circulating way to realize torque dynamic distribution. The method distributes the torque in the soft reduction process ofa continuous casting machine by dynamically regulating casting speed thereof according to the torque of each drive roller, thereby realizing tension operation of a casting billet in the tension leveler and reasonable distribution of the torque. By adopting the method, uniform torque distribution of the tension leveler in the soft reduction implementation process can be realized, generation of bulging of the casting billet is avoided, the implementation effect of soft reduction is ensured, and the maintenance period and the service life of equipment are prolonged.
Description
Technical field
The present invention relates to the method for distributing and controlling tension leveler torque in a kind of continuous casting process, particularly bloom continuous casting dynamic soft reduction process, belong to the metallurgical continuous casting technical field.
Background technology
Along with the development of steel and iron industry, the user is more and more higher to the steel products quality requirement.The strand cross dimension is greater than the large square bland continuous-casting machine of 220mm * 220mm mainly cast high-quality steel and steel alloy, in order to rolling high-strength degree shaped steel, wire rod, channel-section steel, angle steel, round steel and seamless steel pipe etc. to internal soundness and the strict steel grade of compression ratio.
The straightening machine is an important nucleus equipment in the many equipment of large square bland continuous-casting machine, and its main effect is that continuous casting billet is pulled out from the crystallization vibrator, and the arc strand is carried out 3 alignings, wears and send dummy bar.Bloom straightening machine generally is made up of 5-9 frame, being spaced apart about 1.5m of each frame, and driven roller (being drive roll) is for spaced apart, and as shown in Figure 1: the roller that has arrow among the figure is a driven roller, and the roller that does not have arrow is a driven voller.The straightening machine of bloom is pulling rate control, and when pulling rate one timing of measuring roll (being generally the 1# roller), the pulling rate of other roller is also just fixed, and the rotating speed of other driven roller is the coefficient of measuring roll.When implementing gently to depress by the straightening machine, the increase owing to depressing of strand having been caused resistance of billet withdrawal owing to be that the part roller is gently depressed and drafts neither evenly distribute, finally causes the moment maldistribution of straightening machine simultaneously.When depressing, depress roller has been implemented a certain amount of depressing and has been caused casting blank deformation, make the strand attenuation that broadens, cause linear velocity to increase by the casting billet surface behind the depress roller, and then make the linear resonance surface velocity of the rotating speed of the straightening roller that the back do not depress less than strand, as shown in Figure 2, gently depressing the C roller when A, B roller does not implement gently to depress, because the effect of front depress roller causes the linear velocity of casting billet surface to accelerate, make at the linear velocity of C roller casting billet surface rotating speed greater than the C roller, strand is not had the pulling force effect and become braking action, make strand produce bulge.Because resistance of billet withdrawal is very big, cause stagnant base easily when drafts is big, this is because the driven roller ability that moment is bigger when implementing gently to depress still can not be greater than resistance of billet withdrawal after saturated.This because the inhomogeneous effect that not only causes the infringement of equipment easily but also make strand cause the bulge influence gently to depress of the moment distribution that causes after implementing dynamically gently to depress, even cause production accident.The Control System of Load Distribution technology that reported in literature bloom straightening machine aspect pulling rate was once arranged, purpose has been and has addressed the above problem, but the method that this technology adopts is the reallocation of total load, the method is implementing gently to depress in the process actual pulling rate with respect to set pulling rate bigger than normal and fluctuation range is big, and is wayward.
Summary of the invention
Technical problem to be solved by this invention is: the bloom continuous casting dynamic soft reduction process method for distributing and controlling tension leveler torque that provides a kind of and make the tension leveler torque distributed uniform, avoids casting blank bulging to produce.
The alleged problem of the present invention is solved by following technical scheme:
A kind of bloom continuous casting dynamic soft reduction process method for distributing and controlling tension leveler torque, its special feature: it comprises the steps:
A. measuring roll is chosen: the 1# with the straightening machine goes up driven roller as measuring roll;
B. each driven roller moment setting value is calculated: according to predefined driven roller moment distribution coefficient, calculate the moment setting value of other each driven roller according to following formula:
In the formula, T
i AimBe i driven roller moment setting value; a
iBe i driven roller moment distribution coefficient, it chooses scope is 1.0-1.3, T
1 mFor measuring roll detects moment;
C. contrast its setting value and carry out the pulling rate adjustment according to each driven roller moment measured value: actual measurement obtains each driven roller moment measured value, with the moment setting value contrast of b step, when actual measurement moment is set moment greater than this driven roller, reduces the rotating speed of this driven roller; When actual measurement moment is set moment less than this driven roller, strengthen this driven roller rotating speed; When actual measurement moment is consistent with this driven roller setting moment, keep this driven roller rotating speed.
Above-mentioned bloom continuous casting dynamic soft reduction process method for distributing and controlling tension leveler torque, when actual measurement moment and this roller setting moment is inconsistent, adjust this roller speed in accordance with the following methods in the above-mentioned c step: this driven roller moment measured value and setting value are input in the PID adjuster, obtain this driven roller speed adjustment amount by computing, adjust this driven roller speed with this speed adjustment amount, make this driven roller survey moment and setting moment basically identical, the continuous circulation of above-mentioned a, b, three steps of c is carried out, and realizes the moment dynamic assignment.
Above-mentioned bloom continuous casting dynamic soft reduction process method for distributing and controlling tension leveler torque, continuous casting target pulling rate 0.65～0.80m/min, 15～35 ℃ of the degrees of superheat.
The present invention is directed to the straightening machine when implementing dynamically gently to depress, because the resistance of billet withdrawal increase causes tension leveler torque maldistribution problem to be improved, this method is dynamically adjusted its pulling rate according to the moment of each driven roller in implementing the process of gently depressing, moment is distributed, realize that the tension force of strand in the straightening machine moves and the reasonable distribution of moment.Adopt the inventive method, can realize gently depressing tension leveler torque distributed uniform in the implementation process, avoid the generation of casting blank bulging, guaranteed the implementation result gently depressed and the maintenance period and the service life of having improved equipment.
Description of drawings
Fig. 1 is a straightening machine schematic diagram;
Fig. 2 be the straightening machine when implementing gently to depress moment distribute uneven schematic diagram.
The specific embodiment
The present invention is the kinetic controlling equation method of the conticaster straightening machine pulling rate during bloom continuous casting is produced, and it is applicable to the bloom of strand cross dimension greater than 220mm * 220mm, continuous casting pulling rate 0.65～0.80m/min, 15～35 ℃ of the degrees of superheat.
The step of the inventive method is as follows:
(1) determines measuring roll
Referring to Fig. 1, the 1# top roll of selecting the straightening machine is as measuring roll, and this is because the pulling rate that detects when not implementing gently to depress in the continuous casting process is the pulling rate of 1# top roll.Measuring roll reads the pulling rate setting value of straightening machine, makes the rotating speed of motor of measuring roll keep setting value by frequency converter, obtains the moment T of measuring roll
1 m
(2) calculate other driven roller moment setting value
According to the moment distribution coefficient of pre-set driven roller, calculate the moment of each driven roller.Be shown below.
In the formula, T
i AimBe i driven roller moment setting value, i is generally 2-9; a
iBe i driven roller moment distribution coefficient, T
1 mFor measuring roll (1# roller) detects moment.Because drafts is big more when gently depressing enforcement, strand moment is big more, thus driven roller generally to choose the moment distribution coefficient be 1.0-1.3, the driven roller that does not participate in gently depressing gets 1.0, according to the also corresponding increase of this coefficient of increase of drafts, the driven roller of drafts maximum gets 1.3.
(3) adjustment of other driven roller moment
The moment setting value of other driven roller that calculates according to step (2) should value and survey moment values in fact and compare, and when the actual moment of this driven roller during greater than factored moment, reduces the pulling rate of this driven roller; When the actual moment of this driven roller during, strengthen the pulling rate of this driven roller less than factored moment; When the actual moment of this driven roller is consistent with factored moment, keep original pulling rate.Described pulling rate adjustment is carried out in accordance with the following methods: this driven roller moment measured value and setting value are input in the Siemens Step7 software in the special-purpose PID adjuster (this adjuster is the commercially available prod), obtain this driven roller speed adjustment amount by the automatic computing of PID adjuster, adjust this driven roller speed with this speed adjustment amount, make this driven roller survey moment and setting moment basically identical, general error is no more than 1%.
Continuous circulation by above-mentioned three steps is regulated, and realizes the dynamic assignment of moment, keeps pulling rate to be stabilized in certain scope of setting pulling rate.The tension force motion of final realization strand in the straightening machine eliminated and implemented gently to depress the casting blank bulging that cause owing to the moment maldistribution back, the infringement that alleviates equipment.Said process is owing to adopt the 1# top roll not participate in the distribution, and with its standard as other driven roller, well solved pulling rate deviation and fluctuation problem.
Below provide several specific embodiments: described embodiment implements on 7 roller drawing and straightening machines as shown in Figure 1, wherein 1# go up, under the 1#, 3#, 5#, 7# be driven roller, 2#, 4#, 6# are that driven voller does not participate in moment and distributes.
(1) casting machine device parameter: full arc shape large square bland continuous-casting machine, radius 12m, the aligning section of straightening machine and horizontal segment casting roller diameter 450mm, casting machine metallurgical length 33.149m (liquid level is to the flame cutting machine initial point).The distribution of straightening roller is as shown in table 1.
Each roller position of table 1 straightening machine
| Roller number | Position (m) |
| ??1# | ??16.187 |
| ??2# | ??17.670 |
| ??3# | ??19.113 |
| ??4# | ??20.474 |
| ??5# | ??21.809 |
| ??6# | ??23.149 |
| ??7# | ??24.649 |
(2) strand size 280mm * 325mm, steel grade is GCr15, and depressing total amount is 10mm, and steel grades, cast temperature and pulling rate are as shown in table 2.
Table 2 steel grades, cast temperature and pulling rate
(3) when pulling rate is 0.72m/min, the roller of gently depressing that comes into operation is 2#, 3#, 4#, 5#, and the moment distribution coefficient of each driven roller is as shown in table 3.
Table 3 moment distribution coefficient
| The straightening roller | On the 1# | Under the 1# | ??3# | ??5# | ??7# |
| The moment distribution coefficient | ??- | ??1.0 | ??1.25 | ??1.15 | ??1.0 |
| The moment setting value | ??- | ??25N.m | ??31.25N.m | ??28.75N.m | ??25N.m |
| Moment detected value before adjusting | ??25N.m | ??45.2N.m | ??59N.m | ??-5N.m | ??-7N.m |
| The pulling rate adjustment amount | ??- | ??-0.03m/min | ??-0.05m/min | ??0.04m/min | ??0.04m/min |
| Adjust back moment detected value | ??25N.m | ??24.9N.m | ??31.3N.m | ??28.8N.m | ??24.9N.m |
(4) during the integral bearing steel, when pulling rate was 0.72m/min, moment entered rapidly in the dynamic assignment after the Torque Control that comes into operation, and it is basic identical that each drives moment and its setting moment of rod, and the measuring roll pulling rate is stabilized in the scope of 0.71-0.72m/min, has realized the reasonable distribution of tension leveler torque.
(1) each parameter of casting machine equipment such as embodiment 1
(2) strand size 280mm * 325mm, steel grade is SWRH82B, and depressing total amount is 10.59mm, and the roller gently depressed of coming into operation number is 2#, 3#, 4#, 5#, and steel grades, cast temperature and pulling rate are as shown in table 4.
Table 4 steel grades, cast temperature and pulling rate
(3) when pulling rate is 0.80m/min, the roller of gently depressing that comes into operation is 2#, 3#, 4#, 5#, and the moment distribution coefficient of each driven roller is as shown in table 5.
Table 5 moment distribution coefficient
| The straightening roller | On the 1# | Under the 1# | ??3# | ??5# | ??7# |
| The moment distribution coefficient | ??- | ??1.0 | ??1.2 | ??1.1 | ??1.0 |
| The moment setting value | ??- | ??20N.m | ??24N.m | ??22N.m | ??20N.m |
| Moment detected value before adjusting | ??20N.m | ??38N.m | ??46N.m | ??-2N.m | ??-3N.m |
| The pulling rate adjustment amount | ??- | ??-0.02m/min | ??-0.03m/min | ??0.03m/min | ??0.03m/min |
| Adjust back moment detected value | ??20N.m | ??20N.m | ??23.9N.m | ??22N.m | ??20N.m |
When (4) casting SWRH82B, when pulling rate was 0.80m/min, moment entered rapidly in the dynamic assignment after the Torque Control that comes into operation, and it is basic identical that each drives moment and its setting moment of rod, and the measuring roll pulling rate is stabilized in the scope of 0.79-0.80m/min, has realized the reasonable distribution of tension leveler torque.
(1) each parameter of casting machine equipment such as embodiment 1
(2) strand size 280mm * 325mm, steel grade is GCr15, and depressing total amount is 8mm, and steel grades, cast temperature and pulling rate are as shown in table 2.
Table 2 steel grades, cast temperature and pulling rate
(3) when pulling rate is 0.65m/min, the roller of gently depressing that comes into operation is 2#, 3#, 4#, 5#, and the moment distribution coefficient of each driven roller is as shown in table 3.
Table 3 moment distribution coefficient
| The straightening roller | On the 1# | Under the 1# | ??3# | ??5# | ??7# |
| The moment distribution coefficient | ??- | ??1.0 | ??1.3 | ??1.2 | ??1.0 |
| The moment setting value | ??- | ??28N.m | ??36.4N.m | ??33.6N.m | ??28N.m |
| Moment detected value before adjusting | ??28N.m | ??48N.m | ??62N.m | ??-7N.m | ??-9N.m |
| The pulling rate adjustment amount | ??- | ??-0.04m/min | ??-0.06m/min | ??0.04m/min | ??0.05m/min |
| Adjust back moment detected value | ??28N.m | ??28N.m | ??36.5N.m | ??33.55N.m | ??27.9N.m |
(4) during the integral bearing steel, when pulling rate was 0.65m/min, moment entered rapidly in the dynamic assignment after the Torque Control that comes into operation, and it is basic identical that each drives moment and its setting moment of rod, and the measuring roll pulling rate is stabilized in the scope of 0.65-0.66m/min, has realized the reasonable distribution of tension leveler torque.
Claims (3)
1. bloom continuous casting dynamic soft reduction process method for distributing and controlling tension leveler torque, it is characterized in that: it comprises the steps:
A. measuring roll is chosen: the 1# with the straightening machine goes up driven roller as measuring roll;
B. each driven roller moment setting value is calculated: according to predefined driven roller moment distribution coefficient, calculate the moment setting value of other each driven roller according to following formula:
In the formula, T
i AimBe i driven roller moment setting value; α
iBe i driven roller moment distribution coefficient, it chooses scope is 1.0-1.3, T
1 mFor measuring roll detects moment;
C. contrast its setting value and carry out the pulling rate adjustment according to each driven roller moment measured value: actual measurement obtains each driven roller moment measured value, with the moment setting value contrast of b step, when actual measurement moment is set moment greater than this driven roller, reduces the rotating speed of this driven roller; When actual measurement moment is set moment less than this driven roller, strengthen this driven roller rotating speed; When actual measurement moment is consistent with this driven roller setting moment, keep this driven roller rotating speed.
2. bloom continuous casting dynamic soft reduction process method for distributing and controlling tension leveler torque according to claim 1 is characterized in that: adjust this roller speed in the above-mentioned c step when actual measurement moment and this roller setting moment is inconsistent in accordance with the following methods:
This driven roller moment measured value and setting value are input in the PID adjuster, obtain this driven roller speed adjustment amount by computing, adjust this driven roller speed with this speed adjustment amount, make this driven roller survey moment and setting moment basically identical, the continuous circulation of above-mentioned a, b, three steps of c is carried out, and realizes the moment dynamic assignment.
3. bloom continuous casting dynamic soft reduction process method for distributing and controlling tension leveler torque according to claim 1 and 2 is characterized in that: continuous casting target pulling rate 0.65～0.80m/min, 15～35 ℃ of the degrees of superheat.
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| CN2009100754065A CN101648264B (en) | 2009-09-15 | 2009-09-15 | Method for distributing and controlling tension leveler torque in bloom continuous casting dynamic soft reduction process |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102335733A (en) * | 2011-10-21 | 2012-02-01 | 上海亚新连铸技术工程有限公司 | Method for soft reduction through bulging |
| CN102527774A (en) * | 2012-01-19 | 2012-07-04 | 太原科技大学 | Method for dynamically adjusting reduction process parameters of roll straightening machine |
| CN105511509A (en) * | 2016-01-05 | 2016-04-20 | 内蒙古包钢钢联股份有限公司 | Multi-roller straightener load balance control method |
| CN107214312A (en) * | 2017-05-17 | 2017-09-29 | 中冶京诚工程技术有限公司 | Moment control method and pressing device for continuous casting under large pressing amount |
| CN111639749A (en) * | 2020-05-25 | 2020-09-08 | 上海智殷自动化科技有限公司 | Industrial robot friction force identification method based on deep learning |
| CN113523214A (en) * | 2021-06-18 | 2021-10-22 | 首钢集团有限公司 | Slab throwing force distribution method for continuous casting high-reduction process |
| CN114239354A (en) * | 2021-12-14 | 2022-03-25 | 中冶赛迪重庆信息技术有限公司 | Method for predicting bulging amount of casting blank in continuous casting process |
| CN114632919A (en) * | 2020-12-03 | 2022-06-17 | 广西柳州钢铁集团有限公司 | Method for treating surface scratches of continuous casting slab |
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2009
- 2009-09-15 CN CN2009100754065A patent/CN101648264B/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102335733A (en) * | 2011-10-21 | 2012-02-01 | 上海亚新连铸技术工程有限公司 | Method for soft reduction through bulging |
| CN102527774A (en) * | 2012-01-19 | 2012-07-04 | 太原科技大学 | Method for dynamically adjusting reduction process parameters of roll straightening machine |
| CN102527774B (en) * | 2012-01-19 | 2014-07-09 | 太原科技大学 | Method for dynamically adjusting reduction process parameters of roll straightening machine |
| CN105511509B (en) * | 2016-01-05 | 2018-12-25 | 内蒙古包钢钢联股份有限公司 | A kind of multi-roll straightening machine load balance control method |
| CN105511509A (en) * | 2016-01-05 | 2016-04-20 | 内蒙古包钢钢联股份有限公司 | Multi-roller straightener load balance control method |
| CN107214312B (en) * | 2017-05-17 | 2019-05-31 | 中冶京诚工程技术有限公司 | Moment control method and pressing device for continuous casting under large pressing amount |
| CN107214312A (en) * | 2017-05-17 | 2017-09-29 | 中冶京诚工程技术有限公司 | Moment control method and pressing device for continuous casting under large pressing amount |
| CN111639749A (en) * | 2020-05-25 | 2020-09-08 | 上海智殷自动化科技有限公司 | Industrial robot friction force identification method based on deep learning |
| CN114632919A (en) * | 2020-12-03 | 2022-06-17 | 广西柳州钢铁集团有限公司 | Method for treating surface scratches of continuous casting slab |
| CN113523214A (en) * | 2021-06-18 | 2021-10-22 | 首钢集团有限公司 | Slab throwing force distribution method for continuous casting high-reduction process |
| 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 |
| CN114239354A (en) * | 2021-12-14 | 2022-03-25 | 中冶赛迪重庆信息技术有限公司 | Method for predicting bulging amount of casting blank in continuous casting process |
| CN114239354B (en) * | 2021-12-14 | 2024-06-04 | 中冶赛迪信息技术(重庆)有限公司 | Prediction method for casting blank bulging amount in continuous casting process |
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