CN1814377A - Thin band continuous-casting sticking-roll on-line forecasting method - Google Patents
Thin band continuous-casting sticking-roll on-line forecasting method Download PDFInfo
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- CN1814377A CN1814377A CN 200510023719 CN200510023719A CN1814377A CN 1814377 A CN1814377 A CN 1814377A CN 200510023719 CN200510023719 CN 200510023719 CN 200510023719 A CN200510023719 A CN 200510023719A CN 1814377 A CN1814377 A CN 1814377A
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Abstract
This invention is a thin band continuous casting roll banding online forecasting method. Procedures are that pressure transducer gets the pressure value of crystal roller and stored in roll force register, the crystal roller rotating motor current value is collected and stored in current register. Roll force value at each time is got from the roll force register, then the force variance is computed, and the force is controlled stable through roll force/speed controller. If the force continuous increase though through the control of the roll force/speed controller in unit time, then current is compared whether it is continuous increasing in current comparator. Roll banding discriminating gear send roll alarm if the current continuous increase and exceed certain threshold level. The forecast precision is high, its operation and observation is convenient, and roll banding accident is reduced, so the equipment safe is protected and no special equipment needed to add, it is easy to extend in producing.
Description
Technical field
The invention belongs to metallurgy industry continuous casting correlative technology field, relate to a kind of thin band continuous-casting sticking-roll on-line forecasting method.
Background technology
One of thin strap continuous casting principal mode is the crystallization roller of molten steel through rotating at a high speed, and is frozen into the 2-5mm Cast Strip under the effect of roll-force.The basic craft course of thin strap continuous casting production at present is: strip caster (two rollers, single roller, tyre type)-confined chamber-kink-pinch roll-hot rolling (single chassis or two frames or nothing)-control is cold-and batches.In molten steel enters rotation through long nozzle, tundish and submersed nozzle from ladle water-cooled crystallization roller and the molten bath of side seal board formation, cooling through water-cooled crystallization roller forms the Cast Strip, by swing guide, pinch roll the Cast Strip rollgang is delivered in the Cast Strip, through hot-rolling mill, the spray cooling, flying shear is until coiling machine.
Capital equipment in the twin-roll thin strip continuous casting technology as shown in Figure 1, a pair of horizontal parallel water-cooled crystallization roller (1,2), one is that 1, one of stationary roll is mobile roller 2 in the crystallization roller.Motor via reducer and shaft coupling 5 drive the rotation of crystallization roller, and its direction of rotation is opposite.Pre-set roll gap between two crystallization rollers, molten steel is frozen into certain thickness Cast Strip through water-cooled crystallization roller (1,2) from roll gap.The hydraulic servomechanism 4 that mobile roller 2 passes through can be arbitrarily fast, high precision translational, and by displacement transducer 8 record roll gap variable quantities; The pressure sensor 7 of stationary roll 1 two ends installation testing roll-force.With motor (6, the roll-force signal of voltage 9), current signal, pressure sensor 7 and motor speed signal etc. are by high-speed signal acquisition system and signal transmission system and process anti-interference process, be transported among the PLC (Programmable Logic Controller), and in computer, realize functions such as data storage, demonstration, control and warning.
To casting process, no matter be traditional sheet billet continuous casting, or sheet billet or strip casting process, resistance of billet withdrawal is the frictional force during relative motion between solidified shell and the crystallization roller (crystallizer), directly has influence on the Cast Strip and solidifies quality with the Cast Strip.The size of resistance of billet withdrawal and the processing parameter of casting machine have direct relation, as: surface state of pulling rate, steel grade, crystallizer or the like.Compare with traditional casting process, thin strap continuous casting is because pulling rate is fast, and the setting time of molten steel in the crystallization roller is very short, has only the time about 300ms, the surface temperature of the surface temperature of Cast Strip and crystallization roller increases the heat output of crystallization roller all than conventional continuous casting height.The crystal roller surface temperature increases, and has increased the adhesion chance of base shell and crystallizer inwall.Owing to lacked the vibration of crystallizer vibration platform and lubricating of covering slag, therefore be easy to generate roll banding again.When the local roll banding in Cast Strip takes place, crackle, Cast Strip can occur and defective such as tear; When roll banding was serious, promptly the area of Cast Strip roll banding was bigger, and the Cast Strip adheres to roll surface and the crystallization roller can be encased, and caused crystallization roller stall, made the damage of crystallization roller apparatus.In strip casting process, all in confined chamber, whether roll banding is the operator in the curdled appearance of Cast Strip and the production is difficult to detect by an unaided eye for crystallization roller and Cast Strip in addition, and this also is to cause one of higher reason of present accident rate.
In traditional casting process, developed the monitoring method of multiple resistance of billet withdrawal, mainly be in order to monitor the frictional force between base shell and copper plate of crystallizer.These methods mainly contain: one, the load elements determination method (Wolf.M, " modern continuous casting theory and practice ", continuous casting steel machine association of Chinese Metals Society, 1986.P198-207).This method is that load elements is installed on the bracing or strutting arrangement of plate slab crystallizer the right and left, and crystallizer can freely be suspended on the needle bearing, with the influence of avoiding thermal expansion to produce.This cover system is too complicated, and operation and maintenance is all cumbersome.Two, accelerograph (Wolf.M, " modern continuous casting theory and practice ", continuous casting steel machine association of Chinese Metals Society, 1986.P198-207; Yao Man, continuous cast mold frictional force online measuring technique and applied basic research thereof, doctorate paper.Dalian: Dalian University of Technology, 1998).It is one is the sophisticated electronic information processing system at center with the PZT (piezoelectric transducer).It has been widely used for estimating applicability and other technological parameter of covering slag, and the rate of false alarm that facts have proved this method is up to 40% (Yao Man, continuous cast mold frictional force online measuring technique and applied basic research thereof, doctorate paper.Dalian: Dalian University of Technology, 1998).Three, (M.R, Ozgu etc. adopt the method for test to estimate crystallizer protecting residue and practice thereof on Burns Harbor2 slab caster for stressometer method and dynamometer, first European continuous casting meeting collection of translations, Florence, continuous casting steel machine association of Chinese Metals Society, 1991, P40-47; Clemens Miller, the centralized monitoring system of continuous casting factory and unit thereof, metallurgical equipment and technology, 1993, P32-42), i.e. adhering resistance strain sheets on the vibration wall of mould vibration device or vibrating shaft, to determine the resistance of billet withdrawal value, the problem that this method exists mainly is owing to load-sensing unit has weakened its sensitiveness away from crystallizer zone, and this method system complex, is difficult to promote the use of aborning.
The US4892133 patent has proposed to use the light principle, by the variation of light intensity and frequency, monitors in the thin strap continuous casting lubricating status between crystallization roller and Cast Strip; This method equipment complexity needs light source generator, and light receiving system and coherent signal treatment system etc.
The US4497360 patent is to adjust the production pulling rate by the deviation of monitoring moment of torsion transient change and mean value in the process of thin strap continuous casting production aluminium; When deviation is overgauge, increase pulling rate in deviation is reduced to allowed band; When deviation is minus deviation, reduce pulling rate.With this patent mainly be that variation according to moment of torsion comes adjusting process, with moment of torsion as the control parameter.The major defect of this technology is that the change in torque sensitivity is poor, can not be as main control parameters.
In current strip continuous casting technology field, how could effectively roll banding be carried out online forecasting, become the technical problem that presses for solution.
Summary of the invention
The object of the present invention is to provide a kind of thin band continuous-casting sticking-roll on-line forecasting method,, the roll banding accident in the thin strap continuous casting technical process is forecast by online roll-force, crystallization roller rotary electric machine current strength of monitoring the crystallization roller constantly.
For reaching above-mentioned purpose, the present invention adopts following technical scheme,
A kind of thin band continuous-casting sticking-roll on-line forecasting method, this method comprises the following step:
After the casting beginning, obtain the force value of crystallization roller and be stored in the roll-force register, gather crystallization roller rotary electric machine current value and it is stored in the electric current register by pressure sensor;
From the roll-force register, read each roll-force value constantly, calculate the variable quantity of roll-force, and stable by roll-force/speed control controlled rolling power;
If in the unit interval, even passed through the control of roll-force/speed control, roll-force still continues to increase, whether then compare electric current in current comparator continues to increase, if continue to increase, and electric current then sends roll banding by the roll banding discriminating gear and reports to the police above certain threshold value.Wherein, the span of described threshold value is determined according to the structure and the load of power, model and the casting machine of motor.
As a kind of optimal way of the inventive method, the pressure signal that described pressure sensor obtains is the pressure signal of stationary roll in the crystallization roller.
As another optimal way of the inventive method, the span of described unit interval is 5 seconds～20 seconds.
Thin band continuous-casting sticking-roll on-line forecasting method provided by the invention by online roll-force, crystallization roller rotary electric machine current strength of monitoring the crystallization roller constantly, has been realized the online forecasting to roll banding accident in the thin strap continuous casting technical process.Its precision height is convenient to operation and observation, and is not needed to increase special equipment, is easy to promote the use of aborning.Reduce the generation of roll banding accident, protected the safety of equipment, thereby reduced production cost.
Description of drawings
Further specify the present invention below in conjunction with the drawings and the specific embodiments.
Fig. 1 is a thin band continuous-casting sticking-roll online forecasting system construction drawing of the present invention
Fig. 2 is a thin band continuous-casting sticking-roll online forecasting system block diagram of the present invention
Fig. 3 is a thin band continuous-casting sticking-roll on-line forecasting method flow chart of the present invention
Label declaration:
1 stationary roll, 8 displacement transducers
2 move roller 10 plant equipment parts
3 bearing blocks, 11 roll-force registers
4 hydraulic actuating mechanisms, 12 P/V controllers
5 shaft couplings, 13 electric current registers
6 motors, 14 roll-force comparators
7 pressure sensors, 15 current comparators
16 roll banding decision makers, 20 electric control systems
17 roll banding warning devices, 30 forecast parts
The specific embodiment
The roll banding forecast system as shown in Figure 2 in the inventive method, it mainly comprises three parts: first is the plant equipment part, see the dashed rectangle 10 among Fig. 2, main equipment is a pair of crystallization roller (1,2), drive the motor (6,9) of crystallization roller rotation and two pressure sensors 7 that detect roll-force.Wherein stationary roll 1 links to each other with pressure sensor 7 with motor 9 respectively, described pressure sensor 7 is used for obtaining the roll-force numerical value between casting cycle crystallization roller and the Cast Strip, this part is mainly finished the detection and the motor (6 of the pressure signal of this system, 9) transmission agency, and realize current signals; Second portion is an electric control system, see the dashed rectangle 20 among Fig. 2, this part is mainly by the electric current register 13 that connects motor (6,9), the current comparator 15 that connects electric current register 13, the roll-force register 11 that connects two pressure sensors 7, the roll-force comparator 14 that connects roll-force register 11, and composition partly such as the P/V controller 12 that links to each other with roll-force comparator 14 with motor 9.Wherein the roll-force register 11, are used to store described roll-force numerical value; Roll-force comparator 14 is used for described roll-force numerical value change in the comparative unit time; Roll-force/speed (P/V) controller 12 makes roll-force stable by change speed; Electric current register 13 is used for the dynamo-electric fluxion value of store electricity, and whether current comparator 15 is used for the comparison electric current and continues to increase within a certain period of time.This part is mainly finished collection, calculating and the processing of data, is mainly realized by PLC (Programmable Logic Controller); Third part is the forecast part, see the dashed rectangle 30 among Fig. 2, this part mainly comprises roll banding decision maker 16 and the connected roll banding warning device 17 that connects roll-force comparison 14 and current comparator 15, thereby functions such as the demonstration of realization data, warning, this part is finished by computer in the control room.
Carry out the forecast of online roll banding with said system, its online forecasting method flow diagram as shown in Figure 3:
After the cast beginning (step 61), obtain the force value (step 62) of stationary roll 1 and be stored in the roll-force register 11 (step 63) by pressure sensor 7, detect crystallization roller rotary electric machine (6,9) current signals (step 64) value and it is stored in the electric current register 13 (step 65)
Read each roll-force value (step 66) constantly in roll-force register 7 deposit units, calculate the variation delta Δ P of roll-force
i=P
i-P
I-1(step 67), wherein P
iExpression current time roll-force value, P
I-1Expression previous moment roll-force value.When roll-force increases, i.e. Δ P
i, come controlled rolling power to stablize (step 68) by roll-force/speed (P/V) controller 12 change speed, i.e. P/V control at＞0 o'clock.If in Δ t time range, for example 5 seconds～20 seconds, even passed through P/V control, roll-force still continues to increase, then read the current values (step 70) in this Δ t time period in electric current register 13 deposit units, relatively whether electric current should continue to increase in the time period, i.e. I in the Δ t time
i-I
I-1＞0 (step 71), wherein I
iExpression current time current value, I
I-1Expression previous moment current value, if continue to increase, and electric current surpasses certain threshold value Ia (step 72), i.e. I
i-I
I-1During＞Ia, then send roll banding warning (step 73) by the roll banding warning device.
The differentiation of roll banding forecast of the present invention is to determine by motor current value and roll-force value co-variation.And in time Δ t, continue to increase when roll-force, and current of electric also continued to increase at Δ t this moment, and when surpassing certain threshold value Ia, sent the roll banding accident alarming.
In the present embodiment, the picking rate of the display system of high-speed signal acquisition is to be not less than 50ms once; The time Δ t that continues to increase is in 5 seconds～20 seconds time ranges; The signal of gathering is through medium filtering and smoothing processing; Signals transmission mainly comprises measures such as LPF, photoelectricity isolation and shielding through anti-interference process.
Following table is carried out three specific embodiments of online forecasting to the thin band continuous-casting sticking-roll incident for utilization the inventive method; wherein said its online testing result shows; the inventive method precision height; be convenient to operation and observation; reduced the generation of roll banding accident; protect the safety of equipment, thereby reduced production cost.
| Embodiment | Pouring technology | Δt | Ia |
| One | Steel grade 304 stainless steels, pulling rate: 100m/min, tape thickness 2mm, | 10s | 180A |
| Two | Steel grade 304 stainless steels, pulling rate: 60m/min, tape thickness 2mm, | 5s | 210A |
| Three | The steel grade carbon steel, pulling rate: 60m/min, tape thickness 2mm, | 18s | 245A |
The present invention is not limited to the above-mentioned specific embodiment; as long as in thin band continuous-casting sticking-roll on-line forecasting method, roll-force by real-time monitoring crystallization roller and crystallization roller rotary electric machine current strength are forecast the roll banding accident and are all dropped among protection scope of the present invention.
Claims (4)
1, a kind of thin band continuous-casting sticking-roll on-line forecasting method, this method comprises the following step:
After the casting beginning, obtain the force value of crystallization roller and be stored in the roll-force register, gather crystallization roller rotary electric machine current value and it is stored in the electric current register by pressure sensor;
From the roll-force register, read each roll-force value constantly, calculate the variable quantity of roll-force, and stable by roll-force/speed control controlled rolling power;
If in the unit interval, even passed through the control of roll-force/speed control, roll-force still continues to increase, then relatively whether electric current continues to increase, if continue to increase, and electric current then sends roll banding by the roll banding discriminating gear and reports to the police above certain threshold value.
2, thin band continuous-casting sticking-roll on-line forecasting method according to claim 1 is characterized in that: the pressure signal that described pressure sensor obtains is the pressure signal of stationary roll in the crystallization roller.
3, thin band continuous-casting sticking-roll on-line forecasting method according to claim 1 and 2 is characterized in that: be stored in the register after the signal process medium filtering of the collection of the force value of crystallization roller and crystallization roller rotary electric machine current value and smoothing processing are handled again.
4, thin band continuous-casting sticking-roll on-line forecasting method according to claim 1 and 2 is characterized in that: the span of described unit interval is 5 seconds～20 seconds.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100237198A CN1329146C (en) | 2005-01-31 | 2005-01-31 | Thin band continuous-casting sticking-roll on-line forecasting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100237198A CN1329146C (en) | 2005-01-31 | 2005-01-31 | Thin band continuous-casting sticking-roll on-line forecasting method |
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| Publication Number | Publication Date |
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| CN1814377A true CN1814377A (en) | 2006-08-09 |
| CN1329146C CN1329146C (en) | 2007-08-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106269883A (en) * | 2016-08-31 | 2017-01-04 | 番禺珠江钢管（连云港）有限公司 | The real-time monitoring system that roll peels off at machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU639424A3 (en) * | 1975-02-04 | 1978-12-25 | Маннесманн Аг, (Фирма) | Method of continuous casting of steel ingot |
| CH630821A5 (en) * | 1978-08-11 | 1982-07-15 | Concast Ag | METHOD FOR AVOIDING DAMAGE TO STRING GUIDE ELEMENTS OF A STEEL CASTING SYSTEM. |
| US4418741A (en) * | 1979-11-26 | 1983-12-06 | Bondarenko Oleg P | Method of controlling relative movement between an ingot and a mold |
| FR2490516A1 (en) * | 1980-09-01 | 1982-03-26 | Scal Gp Condit Aluminium | METHOD FOR MONITORING AND REGULATING MARKET PARAMETERS OF A CONTINUOUS CASTING MACHINE OF BANDS BETWEEN CYLINDERS |
| JPS6054138B2 (en) * | 1981-01-08 | 1985-11-28 | 新日本製鐵株式会社 | Method for detecting inclusions in cast steel in continuous casting molds |
| US4516625A (en) * | 1983-01-10 | 1985-05-14 | Olin Corporation | Electromagnetic control system for casting thin strip |
| US4615375A (en) * | 1983-04-18 | 1986-10-07 | United States Steel Corporation | Continuous casting mold friction monitor |
| FR2621839B1 (en) * | 1987-10-14 | 1992-02-21 | Cegedur | METHOD FOR CONTROLLING AND ADJUSTING THE LUBRICATION OF THE WORKING FACE OF ROTARY CYLINDERS OF A CONTINUOUS BELT CASTING MACHINE |
| DE3907905C2 (en) * | 1988-07-04 | 1999-01-21 | Mannesmann Ag | Continuous casting process |
| CH691574A5 (en) * | 1999-09-24 | 2001-08-31 | Main Man Inspiration Ag | The strip casting machine for producing a metal strip. |
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- 2005-01-31 CN CNB2005100237198A patent/CN1329146C/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106269883A (en) * | 2016-08-31 | 2017-01-04 | 番禺珠江钢管（连云港）有限公司 | The real-time monitoring system that roll peels off at machine |
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