CN105215058A - The control method that the temperature of a kind of steel plate in Medium and Heavy Plate Rolling Production line process declines - Google Patents

The control method that the temperature of a kind of steel plate in Medium and Heavy Plate Rolling Production line process declines Download PDF

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CN105215058A
CN105215058A CN201410302063.2A CN201410302063A CN105215058A CN 105215058 A CN105215058 A CN 105215058A CN 201410302063 A CN201410302063 A CN 201410302063A CN 105215058 A CN105215058 A CN 105215058A
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steel plate
speed
temperature
rolling
roller
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CN105215058B (en
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王全胜
苗雨川
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Baoshan Iron and Steel Co Ltd
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Abstract

The present invention relates to the control method that the temperature of a kind of steel plate in Medium and Heavy Plate Rolling Production line process declines, relate to a kind of operation of rolling, steel plate comprising milling train final pass is transported to the automation of the roller-way transport process of controlled cooling model device method for control speed from finishing mill.The object of the invention is to meet the TMCP technological parameter requirement that the finish rolling finishing temperature of some product is less than normal with the difference of cooling beginning temperature.Technical solution of the present invention is applicable to produce line according to the modernization cut deal possessing automation control system of finishing mill, controlled cooling model Plant arrangement.Technical solution of the present invention gives the hodograph (Figure 10) meeting and consider that the integrated steel plate rolling finishing temperature and cool the throwing steel process of final pass rolling and the speed seamless connection of steel plate transport process starting temperature process requirement runs, technical solution of the present invention gives the hodograph run for realizing this integrated steel plate, newly increase the rate control module for global coordination computational speed graph parameter, and improve the new speed-control scheme of original each unit speed control module.

Description

The control method that the temperature of a kind of steel plate in Medium and Heavy Plate Rolling Production line process declines
Technical field
The present invention relates to the automation field of Medium and Heavy Plate Rolling Production line, particularly, the present invention relates to a kind of steel plate control method that temperature declines in Medium and Heavy Plate Rolling Production line process, particularly relate to according to the steel plate on the Medium and Heavy Plate Rolling Production line of milling train, pre-straightening machine, controlled cooling model Plant arrangement from finishing mill to the control method that temperature the journey of controlled cooling model device declines.The steel plate of the present invention control method that temperature declines in Medium and Heavy Plate Rolling Production line process relates generally to the control method of steel plate rolling in Medium and Heavy Plate Rolling Production line and transporting velocity.
Technical background
Current modern Medium and Heavy Plate Rolling Production line is furnished with heating furnace, milling train, controlled cooling model device, thermal straightening machine etc. usually, as shown in Figure 1, when producing line layout design, consider the demand of the maximum finished product length of steel plate, the distance between milling train and controlled cooling model device is usually more than 60 meters.
The production procedure of the described Medium and Heavy Plate Rolling Production line that the present invention relates to is:
After steel plate completes the rolling of final pass in milling train, rollgang moves to steel plate before controlled cooling model device after finishing mill, and then steel plate enters controlled cooling model device and carries out water-spraying control.For the steel plate adopting controlled rolling and Controlled cooling process to produce (also referred to as TMCP, thermo-mechanicalcontrolprocess), for reaching the cut deal properties of product of design, must guarantee that production process meets the requirement of some technological parameters aborning, such as finish rolling start rolling temperature, finish rolling finishing temperature, cooling starts temperature, cooling velocity, cooling termination temperature etc., wherein finish rolling finishing temperature, cooling starts Properties Control target (the more detailed content visible " Chinese Medium and Heavy Plate Rolling technique and equipment " that temperature is important employing TMCP technique steel plate, Wang Guodong is edited, 2009, metallurgical industry publishing house, the controlled rolling of the 9th chapter cut deal and controlled cooling model).Finish rolling finishing temperature refers to that finishing mill rolling completes the steel billet temperature of last passage, and cooling starts temperature and refers to that steel plate is about to enter temperature when controlled cooling model device starts water-spraying control.
Due to the key factor comprising finish rolling finishing temperature, cooling starts each TMCP effects of process parameters steel plate microstructure and mechanical property of temperature, after completing the design of alloy of product, product design engineer can according to requirements such as the mechanical properties of final products, and the design providing TMCP technological parameter exports.
In recent years, under the pressure reducing product cost, product design engineer is reducing under the microalloy content condition in cut deal as far as possible, propose more and more overcritical TMCP technological parameter, for some product, the difference that the finish rolling finishing temperature exported according to product composition and performance requirement design and cooling start the numerical value of temperature is less, and such as, the design of certain product exports TMCP technological parameter and requires: finish rolling finishing temperature 770 DEG C, cooling start temperature 740 DEG C.
For the steel plate that the finish rolling finishing temperature of this kind of TMCP technological requirement is less with the difference of the numerical value of cooling beginning temperature, in order to the technological parameter of product design can be reached, the method that can reduce steel plate and decline from the temperature that milling train is transported to controlled cooling model device process just must be found.
This is because the distance between milling train and controlled cooling model device is usually more than 60 meters, steel plate output intent conveniently, the temperature difference that finish rolling finishing temperature and cooling start between temperature is larger, this and steel billet temperature, steel plate width, steel plate length, steel plate thickness, rollgang rotating speed, distance between finishing mill and controlled cooling model device, air themperatures etc. have relation (to ask for an interview " model of hot strip rolling and control ", Sun Yikang writes, 2002, metallurgical industry publishing house, 5.2.1 joint band steel (steel billet, made-up belt) temperature drop when transmitting), but temperature drop is on 50 DEG C usually.In actual production, the finish rolling finishing temperature that steel plate is common and cooling start temperature curve as shown in Figure 2.
In open source literature at home and abroad, seldom relate to the technical scheme reducing steel plate and decline from the air cooling temperature that heavy and medium plate mill is transported to controlled cooling model device process.The technical literature retrieved with this end in view only has the patent JP4935420 of Japanese JFE company.The core of this technical scheme is the device increasing similar hot-rolled intermediate billet stay-warm case, reduces the steel plate temperature drop in output procedure.But this technical scheme needs to increase no small investment, adds new attemperator, and when steel plate generation Head ski-up, this is usually inevitable in actual production, and the head of steel plate easily bumps against on new equipment, has the risk causing production accident.
According to technical scheme of the present invention, the content related to comprises: the steel plate on the Medium and Heavy Plate Rolling Production line arranged according to milling train, controlled cooling model device sequence is from finishing mill to the milling train of controlled cooling model device, the speed automatic control method of total tune rolling mill run-out table, controlled cooling model device.For the technical background of technical solution of the present invention is described, below the existing modern production line of first brief review usually adopt milling train, roller-way, controlled cooling model device method for control speed, and the controlling technology of velocity plan content of the document such as the patent retrieved.
Existing modern production line is realized the automatic control of producing usually by computer control system, be divided into several control units again according to the apparatus arrangement of producing on line.Main logic unit comprises: heating furnace, milling train control unit, controlled cooling model device control units, and auxiliary control unit comprises: thermal straightening machine control unit, several roller-way control units etc.
In addition, described main logic unit comprises two stage control system, wherein automated system based on one-level, and secondary is Process Control System.The real-time control of the relevant parameter such as sequential control, position control, speeds control of the main finishing equipment of described Basic automation level.Described process control level mainly performs mathematics model cootrol function, carries out the complicated calculations of process model, the setting task of complete process parameter, includes the hodograph (that is, the curve of time and length velocity relation) that steel plate runs in procedure parameter.(visible more in detail " Chinese Medium and Heavy Plate Rolling technique and equipment ", the 13rd chapter computer control system).The control unit relevant to the speeds control of milling train, roller-way, controlled cooling model device is as Fig. 3, and wherein, the roller-way on rolling line is divided into some groups (being expressed as N group in figure), often organizes and at least comprises a conveying roller and corresponding driving motor.
In Fig. 3, Mf is finishing mill main driving motor, M is roller-way driving motor, Ma is the driving motor in controlled cooling model device, C1f is the first class control system of finishing mill, and C1 is each speed control unit of roller-way group when transporting steel plate, and C1a is the first class control system of controlled cooling model device, C2f is the second control system of finishing mill, and C2a is the second control system of controlled cooling model device.Wherein, the driving motor M that roller-way group 1 ~ roller-way group N (N:5 ~ 9) is corresponding receives 3 road input control signals, and Plate Production processes corresponding different respectively, these three processes are the operation of rolling, roller-way transport process, controlled cooling model process.
Heavy and medium plate mill is reversable mill, when steel plate carries out the rolling of reciprocal multi-pass in milling train, the steel plate hodograph of each passage is as shown in Fig. 4 (select from " Heavy Plate Production " Sun Benrong etc., 1993.1 metallurgical industry publishing houses, 4.3.3 saves mill speed system).
The hodograph that Fig. 4 operation of rolling light plate runs.
In Fig. 4, Vfmx is steel plate in the maximum mill speed of this passage, F1 moment steel plate enter mill approach table starts mobile, F2 moment steel plate enters milling train and starts rolling, steel plate continues to accelerate, the mill speed of F3 moment steel plate reaches maximum Vfmx, after this speed remains on maximum Vfmx, until the F4 moment, steel plate starts reduction of speed, the F5 moment, steel plate leaves milling train, completes this passes, the F6 moment, stop motion on the roller-way of steel plate after leaving milling train, prepares the rolling of reverse lower passage.
Above-mentioned parameter Vfmx, F1, F2, F3, F4, F5, F6 are calculated by the milling train setting model in finishing mill second control system C2f.Before steel plate starts rolling, these parameters send to the first class control system C1f of finishing mill by finishing mill second control system C2f.In the operation of rolling, C1f is responsible for steel plate speed of service figure to convert the real time motor rotating speed control instruction that finishing mill main driving motor Mf and steel plate move covered each roller-way group driving motor M to.Now, the following Fig. 5 of input signal of the control unit that the speeds control of finishing mill, roller-way, controlled cooling model device is correlated with, solid line in the three road signals that in figure, roller-way group driving motor M receives represents the actual input signal worked, namely motor M performs the real time motor rotating speed control instruction in this road signal, and dotted line represents Puiescent, inoperative input signal at that time.
The control unit schematic diagram that in Fig. 5 operation of rolling, the speeds control of milling train, roller-way, controlled cooling model device is relevant.
After when all passages of steel plate, all rolling completes, steel plate rests on the roller-way after the milling train of the final pass of finishing mill, then, starts steel plate from milling train to the transport process of controlled cooling model device.Usually the speed-control scheme of this process is simple, namely each roller-way group is before steel plate motion arrives, roller-way starts the rotation of fixed rotating speed, in the moment that the concrete numerical value of this fixed rotating speed and starting rotates, to be changed according to given Interal fixation transporting velocity Vrt by the speed control unit C1 of each roller-way group and provide.
Now, the input signal of control unit that the speeds control of finishing mill, roller-way, controlled cooling model device is correlated with is illustrated in fig. 6 shown below.In figure, the solid line in the three road signals that roller-way group driving motor M receives represents the actual input signal worked, and namely motor M performs the real time motor rotating speed control instruction in this road signal, and dotted line represents Puiescent, inoperative input signal at that time.
The control unit schematic diagram that in Fig. 6 transport process, the speeds control of milling train, roller-way, controlled cooling model device is relevant.
(see figure after steel plate head is called as the position of interface point 1 on roller-way, interface point position is usually located at the 1-2 group roller-way group before controlled cooling model device), steel plate starts reduction of speed to zero, then wait for that steel billet temperature reaches after cooling that TMCP technological parameter specifies starts temperature, steel plate setting in motion, enters controlled cooling model device with the speed of Vast.
Controlled cooling model device has started water spray before this, the controling parameters such as open mode, discharge of water spray collector, precalculated by the cooling Mathematical Modeling in the second control system C2a of controlled cooling model device and obtain, the movement velocity figure (that is, the curve of time and length velocity relation) of each roller-way group under controlled cooling model device when beginning to cool down and steel plate cover precalculates provide by cooling Mathematical Modeling.Before beginning to cool down, these parameters send to the first class control system C1a of controlled cooling model device by the second control system C2a of controlled cooling model device.
After steel plate begins to cool down, the control system C1a of controlled cooling model device, C1a is responsible for steel plate speed of service figure to convert the driving motor Ma of controlled cooling model dress to and steel plate moves the real time motor rotating speed control instruction of covered each roller-way group driving motor M, and according to the measuring tempeature of the temperature instrumentation be arranged on after controlled cooling model device, real-time adjustment Ma and and steel plate move the real time motor rotating speed control instruction of covered each roller-way group driving motor M, carry out FEEDBACK CONTROL.The precalculated hodograph of Mathematical Modeling is cooled more complicated in the second control system C2a of controlled cooling model device, due to the speed Vast begun to cool down in major concern hodograph in technical solution of the present invention, can simplified schematic as figure below (ask for an interview in detail " Chinese Medium and Heavy Plate Rolling technique and equipment ", Section 10.5 control cold Mathematical Modeling).
The hodograph of the steel plate operation of Fig. 7 controlled cooling model process.
In the figure 7, the roller-way of A1 moment steel plate before entering controlled cooling model device start mobile, A2 moment steel plate enters controlled cooling model device and begins to cool down, and speed is now Vast, steel plate speed when namely beginning to cool down, after steel plate even running a period of time, start slow Accelerating running in the A3 moment, until A4 moment steel plate leaves controlled cooling model device, complete controlled cooling model process, stop motion on roller-way before the A6 moment runs to thermal straightening machine, prepares to start to align passage.Above-mentioned parameter Vast, A1, A2, A3, A4, A5 etc. are calculated by the cooling Mathematical Modeling in the second control system C2a of controlled cooling model device.Now, the following Fig. 8 of input signal of the control unit that the speeds control of finishing mill, roller-way, controlled cooling model device is correlated with, solid line in the three road signals that in figure, roller-way group driving motor M receives represents the actual input signal worked, namely motor M performs the real time motor rotating speed control instruction in this road signal, and dotted line represents Puiescent, inoperative input signal at that time.
The control unit schematic diagram that the speeds control of the milling train of Fig. 8 controlled cooling model process, roller-way, controlled cooling model device is relevant.
The object of technical solution of the present invention is that the temperature that minimizing steel plate is transported to controlled cooling model device process from milling train declines, so from last passage be rolled down to steel plate start controlled cooling model, be the process that technical solution of the present invention is concerned about, be necessary that the hodograph original for the automation control system in whole process steel plate runs gives complete presenting.
Fig. 9 from last passage be rolled down to steel plate start controlled cooling model whole process steel plate run hodograph.
The RT2 moment in Fig. 9 is the interface point position of steel plate head on roller-way, and trigger the moment point of reduction of speed on the roller-way of steel plate before controlled cooling model device, Vrt is the steel plate at the uniform velocity transporting velocity that control unit C1 provides.
After the retrieval heavy and medium plate mill patent relevant with the speeds control of roller-way and other open source literatures, there is no discovery to reduce steel plate to drop to object technical scheme from the milling train temperature be transported to controlled cooling model device process.
Such as, what one class technical scheme was paid close attention to is that the velocity of rotation of separating reversable mill main driving motor and electric machines for roller is mated and determines that electric machines for roller start the reasonable moment started, in brief, be the speeds control matching and coordination that finishing mill and steel plate move between covered each roller-way group driving motor.
Its more valuable scheme comprises: the CN200780008900.9 " operation method for reversable mill " of Siemens Company, propose in reversible rolling process, how to determine the reasonably energy-conservation roller-way group Startup time mated with mill milling hodograph, and give operation method and the device of corresponding reversable mill.The CN201210083526.1 " speed adaptive between roller-way and milling train controls " of Shanghai Meishan Iron& Steel Co., Ltd, by the Self Adaptive Control of the loading moment of electric machines for roller, for mating of the speed moment between roller-way with milling train.The speed-control scheme of mating between other similar milling train and electric machines for roller, also comprises the JP57-94415 of Hitachi, Ltd, the JP60-127017 of Toshiba.
Another kind of technical scheme is the improvement of the method for control speed of the operation of rolling to reversable mill, namely to the improvement of steel plate rolling hodograph.The object of the technical scheme of the JP2001-62503 of Kawasaki Steel be to reach accurately control the passage of steel plate in reversible rolling complete after steel plate stop position, method is by the precise and tiny adjustment to mill speed figure.The US4232369A of Kawasaki Steel gives computer control systems and the control method of the control of reversable mill mill speed.
Above two class technical schemes, it is of concern that the speeds control details of milling train and the attached roller-way of milling train, namely pay close attention to the design and implimentation of C1f, C2f internal speed controlling functions in Fig. 3.
Relatively, technical solution of the present invention is it is of concern that the method for control speed of entirety from finishing mill to controlled cooling model device, thus reach the object reducing steel plate conveying temperature drop, technical solution of the present invention described later is based upon all fronts speed coordinating control module on overall automation control system, thus instruct C2f, C1, C2a to provide more reasonably overall hodograph.Technical solution of the present invention is it is of concern that the method for control speed of entirety from finishing mill to controlled cooling model device.
A class technical scheme is also had to pay close attention to the perfect of the speeds control of electric machines for roller body, the such as JP2005-98828 of JFE company, propose the method for supervising of the electric machines for roller abnormal torque load for conveying deformed steel strip steel plate, namely pay close attention to the Improvement and perfection of the C1 in Fig. 3.
Other, roller table speed control program when one class technical scheme is for arrangement two pieces in roller-way group and two or more transports, emphasis reduces the distance between steel plate and steel plate, thus improve rhythm of production, but need to prevent from colliding between steel plate simultaneously, occur production accident.Its concrete technical scheme comprises: the CN103372572 " a kind of control method improving roughing mill milling rhythm " of Baoshan Iron & Steel Co., Ltd, according to slab checkout gear end to end, the condition preventing slab from colliding is set, reduces the distance between slab on roller-way.The WO0056476 of Kawasaki Steel, by increasing camera, prevents from colliding between steel plate.This kind of technical scheme is completely different from the focus of technical solution of the present invention, the production process that technical solution of the present invention is improved is that finishing mill rolling is accomplished to the process started between controlled cooling model, because the speed of service of steel plate in controlled cooling model device is usually less than maximum mill speed many, do not possess polylith steel and wait for the precondition entering controlled cooling model device, so without comparativity.
A class technical scheme is the technical scheme for the control beginning to cool down temperature in addition, this is identical with the focus of technical solution of the present invention, but investigate these technical schemes can find, except the patent JP4935420 of Japanese JFE company introduced above, the core of this technical scheme increases steel plate stay-warm case device, reduces the steel plate temperature drop in output procedure.Other control devices are all the methods by increasing cooling way, reduce steel billet temperature, thus the difference of the temperature increased when steel plate rolling completes and temperature when beginning to cool down.The starting point of this and technical solution of the present invention is tried to go south by driving the chariot north, without the need to comparing, as the JP2005-979 of JFE company, the CN102000703 " hot-rolling mill goes out side temperature control equipment and control method " of Hitachi, Ltd.
In addition, the CN101745549 " a kind of control method of hot-continuous-rolling strip steel steel feeding temperature " of Baoshan Iron & Steel Co., Ltd is by the delay table speed between adjustment hot rolling roughing mill and finishing mill, controls the entry temperature at finishing of band steel.This patent is the thinking adopting dynamic variable specification, hot-rolled product description is classified, (pre-straightening is being comprised to each equipment except delay table made from roughing mill to finishing mill to often kind of specification, intermediate heater, cutter, De-scaling box) narrower Speed Setting scope, the entry temperature at finishing (empirical value) of intermediate blank temperature and the expectation measured is exported according to roughing mill, calculate the temperature drop of intermediate blank at each equipment section except delay table, thus the time of staying estimated at delay table, and then determine delay table speed.
The something in common of this technical scheme and technical solution of the present invention be known steel plate course of conveying beginning temperature, expect end temp after, the carrying out of the hodograph of entirety is considered, selects suitable RPM schedule.
But the difference of this technical scheme and technical solution of the present invention is:
One is the difference of producing line type and control object, the control object of this technical scheme is being furnished with roughing mill, delay table, pre-straightening machine, intermediate heater, cutter, the delay table of the conveying intermediate blank on the hot-rolled strip production line of De-scaling box, the control object of technical solution of the present invention is furnished with finishing mill, roller-way, the finishing mill of the Heavy Plate Production line of controlled cooling model device, roller-way, controlled cooling model device, namely the control of this technical scheme exports as the speed as the delay table of single devices, the control of technical solution of the present invention exports as the finishing mill final pass operation of rolling, the speed service chart of the total tune of roller-way transport process and controlled cooling model device start into the speeds control before steel,
Two is the differences controlling object, the object of this technical scheme guarantees suitable finish rolling steel feeding temperature empirical value, can not be too low, cause two-phase section rolling, again can not be too high, cause iron scale blocked up, so target temperature interval is between 900 ~ 1050 degrees Celsius, technical solution of the present invention needs the cooling of the TMCP technique guaranteed to start temperature, and temperature range is low many, between 600 ~ 850 degrees Celsius, require to reduce transport process temperature drop as far as possible;
Three is that concrete technical scheme is different, this technical scheme is mainly determined delay table speed switching point and is selected suitable delay table speed, technical solution of the present invention is the speed service chart changing the last rolling pass of finishing mill, steel is thrown with maximum mill speed, and starting roller-way transport process with same speed, the speed of service graph parameters such as the maximum mill speed of milling train are provided by the speed total tune module increased newly.
In addition, the actual defects that this technical scheme exists is that intermediate blank is accelerated, down speeding procedure is too much, easily causes to produce between roller-way and intermediate blank lower surface and slides, bring cut to intermediate blank lower surface.
The innovative point of technical solution of the present invention is, one is the potentiality that the speed service chart of total tune can play equipment to greatest extent, reduces the steel plate temperature drop in transport process to greatest extent; Two is the least possible operation acceleration, the speed of service figure of down speeding procedure, can reduce the danger that the electric machines for roller moment load of high-speed rotation is excessive, and also slide between minimizing lower surface of steel plate and roller-way the surface of steel plate cut caused.
In sum, prior art: the production process of steel plate controlled cooling model from last rolling pass rolling is accomplished to, be divided into the independently operation of rolling, roller-way transport process, pre-straightening process, controlled cooling model process, speed control units corresponding different respectively, each unit carries out speeds control according to the steel plate service chart of this unit alone, and (service chart specifically asks for an interview Fig. 4, Fig. 7 and Fig. 9), the control of front process can not consider the temperature requirement of rear operation, more the carrying out of the hodograph of entirety is not considered, see the technological parameter requirement that whether can arrive product design.Namely the speeds control of the operation of rolling, steel plate transport process does not consider that the cooling of steel plate when entering controlled cooling model device starts temperature and whether conform with the requirement of TMCP technological parameter.
The hodograph of the steel plate operation that prior art is corresponding is as Figure 16.
The deficiencies in the prior art part is: in recent years, under the pressure reducing product cost, product design engineer is reducing under the microalloy content condition in cut deal as far as possible, propose more and more overcritical TMCP technological parameter, for some product, the difference that the finish rolling finishing temperature exported according to product composition and performance requirement design and cooling start the numerical value of temperature is less than normal.And the steel plate that existing cut deal produces line common transports control method, cause steel plate from finishing mill to controlled cooling model device the design that is greater than some product adopting TMCP technique of actual temperature drop export requirement.Prior art fails fully to meet corresponding requirement, or prior art fails fully to meet corresponding requirement with most economical cost, easy, the approach optimized and technique.
Summary of the invention
The object of technical solution of the present invention produces line for the modernization cut deal possessing automation control system according to finishing mill, controlled cooling model Plant arrangement, the method for control speed of the total tune of the finishing mill final pass operation of rolling, roller-way transport process is provided, thus the temperature that minimizing steel plate is transported to controlled cooling model device process from milling train declines, meet the requirement of the design output parameters such as the finish rolling finishing temperature of some product adopting TMCP technique, cooling beginning temperature.
The content that the present invention relates to comprises: the steel plate on the Medium and Heavy Plate Rolling Production line arranged according to milling train, controlled cooling model device sequence is from finishing mill to the milling train of controlled cooling model device, the speed automatic control method of total tune rolling mill run-out table, controlled cooling model device.
Adopt the difference of the finish rolling finishing temperature of the product of TMCP technique and cooling beginning temperature less than normal for some, conventional roller-way transportation method can not meet the actual production problem of technological requirement, and technical solution of the present invention provides a kind of operation of rolling, steel plate comprising milling train final pass to be transported to the method for control speed of the automation of the roller-way transport process of controlled cooling model device from finishing mill.
Technical solution of the present invention is as follows:
The control method that the temperature of a kind of steel plate in Medium and Heavy Plate Rolling Production line process declines, relate generally to the control method of steel plate rolling for Medium and Heavy Plate Rolling Production line and transporting velocity, described Medium and Heavy Plate Rolling Production line order comprises: the final pass milling train of finishing mill, 1 ~ N group rollgang after milling train, controlled cooling model device and thermal straightening machine, the control method of described steel plate rolling and transporting velocity is the speed automatic control method of a total tune, comprise the finishing mill final pass operation of rolling, the speeds control of the total tune of roller-way transport process, it is characterized in that,
N is 5-9,
After the expectation of known steel plate course of conveying starts temperature (the finish rolling finishing temperature of TMCP technique), expectation end temp (cooling of TMCP technique starts temperature), steel plate overall operation hodograph is considered, reduce the reduction of speed of overall process light plate, pause, make the rolling maximal rate of finishing mill final pass identical with the numerical value that roller-way transports maximal rate, obtain suitable RPM schedule
Setting Vmx is the maximum mill speed of steel plate at finishing mill final pass, is also the even speed in transport process,
In the F1 moment, namely steel plate is entering the finishing mill final pass milling train moment, and steel plate starts mobile on roller-way,
In the F2 moment, namely steel plate enters finishing mill final pass milling train and starts the rolling moment, and steel plate continues to accelerate,
In the F3' moment, namely the mill speed of steel plate reaches the maximum Vmx moment, and after this speed remains on maximum Vmx,
Until the F5' moment, namely steel plate leaves milling train, completes this passes, and speed still remains on Vmx,
In the RT1' moment, namely steel plate tail leaves certain the group roller-way group in milling train the 2 to 4 group roller-way group below, and this roller-way group, also referred to as transport process switching point, triggers the control inputs signal switching of electric machines for roller,
Described electric machines for roller are controlled by the speed control unit C1 of each roller-way group, and steel plate still continues the transport velocity keeping Vmx;
In the RT2' moment, steel plate head reaches interface point, and interface point is defined as the position at the 1st group or the 2nd group roller-way group place before controlled cooling model device, and then, steel plate starts reduction of speed;
In the A1' moment, steel plate speed reaches cooling commencing speed Vast, and trigger the control inputs signal switching of electric machines for roller, motor is taken over by the first class control system C1a of controlled cooling model device, and keeps Vast speed;
In the A2' moment, that is, steel plate enters the controlled cooling model device moment, and now the temperature of steel plate can reach or cooling close to TMCP technological requirement starts temperature.
Interface point is defined as the position at the 1st group or the 2nd group roller-way group place before controlled cooling model device, and concrete employing the 1st group or the position of the 2nd group are arranged when the electrical automation system design of production line.
According to technical scheme of the present invention, TMCP technique, is also called controlled rolling and Controlled cooling process produces (TMCP, thermo-mechanicalcontrolprocess), this Plate Production technique is ripe in last century, is one of maximum scientific and technological progress of metallurgical industry in last century.
TMCP is normally defined: on the basis of adjustment steel chemical composition, by controling effectively to the temperature schedule in the operation of rolling, deformation system and roller repairing system etc., significantly changing steel microstructure and making its rolling technique obtaining favorable comprehensive mechanical property (saving controlled rolling rolling and controlled cooling model from " Chinese Medium and Heavy Plate Rolling technique and equipment " 9.4).
This is in fact a kind of manufacturing technique method that hot rolling deformation and steel heat process are combined, and this method requires that production process meets the requirement of some given technological parameters.Finish rolling finishing temperature and cooling beginning temperature are two parameters wherein, and for TMCP technique, these two technological parameters, for different steel grades, are have incomplete same scope.
The present invention is that the finish rolling finishing temperature of the TMCP designed in order to realize some plate product (such as some pipe line steel product) in process of production and cooling start temperature process parameter, in other words in order to the requirement of the TMCP technological parameter that product has designed can be reached, to the technical scheme of the transformation that the equipment on production line carries out, specifically, be the technical scheme that the speed control system in plate rolling line automated system is transformed.So for purposes of the invention, it is exactly two input parameters controlling to need that finish rolling finishing temperature and cooling start temperature, for the temperature range of general most steel grades, the finish rolling finishing temperature of TMCP technique: 950 ~ 700 DEG C, the cooling of TMCP technique starts temperature: 900 ~ 750 DEG C.
According to technical scheme of the present invention, F1, F2, F3', the F5' moment is all that the hodograph setup algorithm module set in Mathematical Modeling by the milling train of existing finishing mill second control system C2f calculates according to set arithmetic logic, belongs to existing control system module.
Such as, the F1 moment is the initial time that module starts to work, timing from this moment, namely the F1 moment concrete time=0s, now steel plate is parked on roller-way, and this position is otherwise known as and throws steel position, and throwing steel position is called as throwing steel distance to the distance of milling train.
During F2 moment, steel plate enters milling train, and control system is by the rolling force sensor of monitoring milling train, if the real time data of rolling force sensor is greater than the threshold values (as 6MN) of certain default, then think that steel plate starts steel rolling, namely steel plate is in the F2 moment,
Roller-way and milling train acceleration (unit: m/s 2), (unit: m) be the given numerical value of human-machine interaction picture, throws steel position to milling train to throw steel distance.
The F3' moment is the moment that steel plate rolling speed reaches maximum Vmx, being calculated as follows of concrete time, the concrete time in the speed=roller-way in F2 moment and milling train acceleration × F2 moment, unit: m/s2, the F3' moment concrete time=the F2 moment concrete time+(speed in Vmx-F2 moment)/roll table accelerating, unit: the unit m/s2 of s, Vmx.The trigger event in F5' moment is that the real time data of mill milling force snesor is less than the given threshold values of system, then think that steel plate leaves milling train, the F5' moment concrete time=(steel plate length-0.5 × (speed+Vmx in F2 moment) of this rolling pass outlet × concrete time of m-F2 moment (during F3' moment concrete))/Vmx, unit: s, other modules that the steel plate length of this rolling pass outlet is set in Mathematical Modeling by the milling train of existing finishing mill second control system C2f calculate, unit: m.
In the RT2' moment, interface point is reached exactly at the head of this moment steel plate, interface point 2 position is usually located at before one or two group of roller-way group of controlled cooling model device, specifically line is produced for certain, concrete roller-way group number before interface point 2 position has determined controlled cooling model device when the electrical automation system design of production line, Fig. 8 asked for an interview by schematic diagram.
In the A1' moment, that is, steel plate speed reaches cooling commencing speed Vast, and trigger the control inputs signal switching of electric machines for roller, motor is taken over by the first class control system C1a of controlled cooling model device, and keeps Vast speed;
In the A2' moment, that is, steel plate enters the controlled cooling model device moment, and steel plate enters controlled cooling model device, starts controlled cooling model process.In the A2' moment, namely, steel plate enters the controlled cooling model device moment, because given the rolling maximal rate of rational finishing mill final pass, roller-way transport maximal rate uniform velocity parameter, decrease the steel plate reduction of speed of steel plate between the finishing mill final pass operation of rolling to roller-way transport process, pause, reduce the air cooling temperature drop of steel plate in whole process, now the temperature of steel plate can reach or cooling close to TMCP technological requirement starts temperature.
Controlled cooling model process itself is comparatively complicated, it is to the effect that: ensure steel plate each position cooling evenly, under the harmless prerequisite of plate shape, the austenite phase transformation condition of steel is control effectively, comprising rationally determining that cooling starts the technological parameters such as temperature, cooling velocity, cooling termination temperature and cooling path, thus the control realized steel phase transition process, the final microstructure and mechanical property required for acquisition.(above definition is copied and is saved cooling system control from " Chinese Medium and Heavy Plate Rolling technique and equipment " 9.4.3.4).
The process for cooling parameter such as cooling velocity, cooling termination temperature of steel plate is exactly the target call that controlled cooling model process will reach.The means of concrete controlled cooling model process, according to the difference of the device type of controlled cooling model device, there are various concrete means, the controlled cooling model device that roller press type direct quenching device and the U-tube laminar flow accelerated cooling device of the western mark company of Germany used for Baosteel Heavy Plate Mill's production line combine, concrete means of its control comprise the means such as upper constraint roll restraining force of the U-tube laminar flow collector group number opened in advance, total water supply flow, steel plate speed of service figure in cooling controller, roller press type direct quenching device.Steel plate speed of service figure after cooling starts is a wherein important control device, this is calculated by the cooling jig in the second control system C2a of controlled cooling model device, the present invention does not change for the steel plate service chart after beginning to cool down, and still maintains original service chart.
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that, the finish rolling finishing temperature of described TMCP technique: 950 ~ 700 DEG C, the cooling of described TMCP technique starts temperature: 900 ~ 750 DEG C.
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
The realization of the speed of service figure of above-mentioned whole process newly, need a rate control module C2g for global coordination computational speed graph parameter, the function of C2g is before last passage of finishing mill starts rolling, according to the finish rolling finishing temperature of the steel plate required in production ordering, cooling starts temperature, require C2a, speed Vast when the cooling that cooling Mathematical Modeling in the second control system of i.e. controlled cooling model device calculates this steel plate starts, and the final size after completing in conjunction with steel plate rolling, calculate the maximum mill speed Vmx of suitable final pass, this velocity amplitude is also the transport velocity of the transport process of steel plate, finally result of calculation (i.e. Vmx) is sent to C2f, the i.e. second control system of finishing mill, with C1 module, namely speed control unit module when roller-way group transports steel plate.
Current modern cut deal control system is all configured with cooling Mathematical Modeling, details is asked for an interview " Chinese Medium and Heavy Plate Rolling technique and equipment ", section 10.5, the cold Mathematical Modeling of control and " foundation of the refractory gold ores that slab roller repairing controls and Process Control System ", Wang Xiaobo etc., world steel, the 6th phase in 2010).
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
Control module C2g is provided with the communication interface with the C1 of C2f, C2L, C2a, each roller-way group, is also provided with the interface of access production ordering (PDI) relevant information,
Complete the rolling of passage second from the bottom of finishing mill at steel plate after, before namely in the end a passage starts rolling, trigger this control module C2g and operate.
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
The internal process of described C2g module running and as follows with the information interaction content of other unit modules:
The second control system C2f of finishing mill is after steel plate rolling completes passage second from the bottom, and notice C2g starts to start, and C2g module notifies that the second control system C2a of controlled cooling model device starts to calculate respectively;
The cooling Mathematical Modeling of C2a completes computational process, and the cooling commencing speed Vast in result of calculation is returned to C2g;
C2g, after receiving the Vast from C2a, starts the calculating of overall operation hodograph;
After C2g completes the calculating of overall operation hodograph, the maximal rate Vmx in result of calculation, send to C2f, as rolling maximal rate, and require that C2f recalculates the speed of service figure of the operation of rolling;
C2g is the maximal rate Vmx in result of calculation, and send to the motor control unit C1 of each roller-way group, Vmx is as transport process maximal rate.
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
The concrete calculation procedure of the overall operation hodograph in the internal process of described control module C2g is:
5) the cooling commencing speed Vast from C2a unit cooling calculated with mathematical model is accepted;
6) access production ordering information (PDI) interface, obtain the mill product thickness h of steel plate, the finish rolling finishing temperature Tfin of TMCP technique, the cooling of TMCP technique start temperature Tast;
7) according to radiant heat transfer computing formula, (steel plate of derivation is from the computing formula leaving the time required for milling train to controlled cooling model device in use, calculating required time △ t can allow steel plate decline in the operating temperature of roller-way, meet temperature drop value corresponding to TMCP technological parameter (finish rolling finishing temperature Tfin-cools and starts temperature Tast)
8) according to the distance transporting required time △ t and product line layout calculated, calculate the machine maximal rate Vmx that final pass rolls, Vmx is also the maximal rate of roller-way transport process simultaneously.
Described radiant heat transfer computing formula is known, temperature drop when transporting with steel is the thermal loss that causes of radiation mainly, the computing formula of the heat radiation heat transfer of steel plate in transport process can save temperature drop when being with steel to transmit with reference to " model of hot strip rolling and control " 5.2.1, Sun Yikang, metallurgical industry publishing house, 2002).
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
The computing formula of △ t is as follows:
Δt = h × ρc 6 ϵσ × ( Tast - 3 - Tfin - 3 ) Formula (1)
In formula (1),
H is the finished product thickness (m) after steel plate rolling completes,
Tast is that the cooling of TMCP technique starts temperature (unit: Kelvin K),
Tfin is the finish rolling finishing temperature (unit: Kelvin K) of TMCP technique,
ρ is the density (kg/m of steel plate when high temperature 3, 7300 ~ 7800kg/m 3),
C is the specific heat of steel plate when high temperature (J/ (kgK), 600 ~ 750J/ (kgK)),
σ is Si Difen-Boltzmann constant (σ=5.67 × 10 -8w/ (m 2k 4)), the numerical value of above-mentioned three parameters and span, for these those skilled in the art are in common knowledge.
ε is the radiance of high-temperature steel plate plane to space radiation, and numerical value is between 0.6 ~ 0.8.
ε can save according to " model of hot strip rolling and control " 5.2.1 the method introduced, and tries to achieve after carrying out temperature statistics.
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
The computing formula of output parameter milling train maximal rate Vmx is as follows:
Vmx = S f Δt - S a Vast × coe Formula (2)
In formula (2),
Sf is the distance (m, scope 5 ~ 20m) of finishing mill to roller-way interface point 1,
Sa is the distance (m, scope 0.8 ~ 10m) of roller-way interface point 2 to controlled cooling model device,
△ t is the result of calculation (s, scope 0.1 ~ 30s) of formula (1),
Vast is the cooling commencing speed (m/s, scope: 0.3 ~ 3.0m/s) from C2a unit cooling calculated with mathematical model,
Coe is correction factor, and scope is 0.9 ~ 1.2.
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
Finishing mill second control system C2f runs as follows:
The second control system C2f of described finishing mill, after receiving the milling train maximal rate Vmx from the output parameter of rate control module C2g, makes the parameter of original control unit, i.e. the maximum Vfmx=Vmx that reaches of the mill speed of steel plate, then,
The mill speed making the second control system C2f of finishing mill recalculate steel plate reaches the moment of maximum: the F3 ' moment, makes the parameter of original control unit, and namely the mill speed of steel plate reaches the moment F3=F3 ' of maximum.
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
The speed control unit C1 of each roller-way group runs as follows:
Described speed control unit C1, after receiving the output parameter Vmx from C2g, makes the parameter Vrt=Vmx of original control unit, and does not use the preset parameter that each roller-way group control unit self original is preserved;
When the RT2' moment, after steel plate head arrives interface point, steel plate starts reduction of speed, and steel plate speed reaches cooling commencing speed Vast, namely in the A1' moment, triggers the control inputs signal switching of electric machines for roller, replaces original reduction of speed and just trigger switching to zero, can leave out.
According to the control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines, it is characterized in that,
The speed control unit C1a of described controlled cooling model device runs as follows:
When in the A1' moment, after triggering the control inputs signal switching of electric machines for roller, motor is taken over by the first class control system C1a of controlled cooling model device, now keep Vast speed, do not need acceleration or deceleration, until in the A2' moment, steel plate enters controlled cooling model device, start controlled cooling model process, replace original needs and accelerate to speed Vast from zero.
Technical solution of the present invention is as follows:
Be applicable to produce line according to the modernization cut deal possessing automation control system of finishing mill, controlled cooling model Plant arrangement, layout drawing is shown in Fig. 1, and needs to possess control unit as relevant in the speeds control of the milling train of Fig. 3, roller-way, controlled cooling model device.
Technical solution of the present invention from last passage be rolled down to the steel plate speed of service figure of process that steel plate starts controlled cooling model, as Figure 10.
Figure 10 from last passage be rolled down to steel plate start controlled cooling model whole process steel plate run new hodograph
As shown in Figure 10, Vmx is the maximum mill speed of steel plate in the end passage, also be the even speed in transport process, F1 moment steel plate mill approach table starts mobile entering, and F2 moment steel plate enters milling train and starts rolling, steel plate continues to accelerate, the mill speed of F3' moment steel plate reaches maximum Vmx, and after this speed remains on maximum Vmx, until F5' moment steel plate leaves milling train, complete this passes, speed still remains on Vmx.In the 2 to 4 group roller-way group that steel plate tail is left after milling train certain group roller-way group (this roller-way group is called as transport process switching point) time, for the RT1' moment in diagram, trigger the control inputs signal switching of electric machines for roller, motor is controlled by the speed control unit C1 of each roller-way group, and steel plate still continues the transport velocity keeping Vmx.When the RT2' moment, after steel plate head arrives interface point, steel plate starts reduction of speed, and in the A1' moment, steel plate speed reaches cooling commencing speed Vast, trigger the control inputs signal switching of electric machines for roller, motor is taken over by the first class control system C1a of controlled cooling model device, and keeps Vast speed, in the A2' moment, steel plate enters controlled cooling model device, starts controlled cooling model process.
The realization of the speed of service figure of above-mentioned whole process newly, needs to newly increase a rate control module C2g for global coordination computational speed graph parameter, as shown below.The function of C2g is before last passage of finishing mill starts rolling, according to finish rolling finishing temperature, the cooling beginning temperature of the steel plate required in production ordering, require the speed Vast when cooling that the cooling Mathematical Modeling in C2a calculates this steel plate starts, and the final size after completing in conjunction with steel plate rolling, calculate the maximum mill speed Vmx of suitable final pass, this velocity amplitude is also the transport velocity of the transport process of steel plate, finally result of calculation is sent to C2f and C1 module.The speeds control correlation function of C2f, C1, C2a inside also needs corresponding change, finally realizes the hodograph that new steel plate runs.
The Content of communciation of the control module C2g newly increased and other modules and communication moment, be summarized as follows.The C1 of C2g and C2f, C2a, each roller-way group has communication interface, accesses the interface of production ordering (PDI) relevant information in addition.Complete the rolling of passage second from the bottom of finishing mill at steel plate after, before namely in the end a passage starts rolling, trigger the running of this module, the internal process of this module running and the information interaction content with other unit modules, See Figure 12.
The computational methods of the overall operation hodograph in the internal process of the control module C2g newly increased, are summarized as follows.Corresponding input parameter comprises: the cooling of the mill product thickness h of steel plate, the finish rolling finishing temperature Tfin of TMCP technique, TMCP technique starts temperature Tast, cooling commencing speed Vast, and output parameter is Vmx, sees Figure 13.
Concrete calculation procedure is:
Accept the cooling commencing speed Vast from C2a unit cooling calculated with mathematical model;
Access production ordering information (PDI) interface, obtains the mill product thickness h of steel plate, the finish rolling finishing temperature Tfin of TMCP technique, the cooling of TMCP technique starts temperature Tast;
Use is according to the steel plate of radiant heat transfer formula proving from the computing formula leaving the time required for milling train to controlled cooling model device, and the required time △ t calculated can allow steel plate meet temperature drop value corresponding to TMCP technological parameter (finish rolling finishing temperature Tfin-cools and starts temperature Tast) in the decline of roller-way operating temperature.The computing formula of △ t is as follows:
Δt = h × ρc 6 ϵσ × ( Tast - 3 - Tfin - 3 ) Formula (1)
In formula (1), h is the finished product thickness after steel plate rolling completes, and Tast is the finish rolling finishing temperature (unit: Kelvin) that cooling starts temperature (unit: Kelvin), Tfin is TMCP technique of TMCP technique.ρ is the density of steel plate when high temperature, and c is the specific heat of steel plate when high temperature, and σ is Si Difen-Boltzmann constant, the numerical value of above-mentioned three parameters and span, for these those skilled in the art are in common knowledge.ε is the radiance of high-temperature steel plate plane to space radiation, and numerical value, between 0.6 ~ 0.8, can save according to " model of hot strip rolling and control " 5.2.1 the method introduced, try to achieve after carrying out temperature statistics.
The calculating of output parameter milling train maximal rate Vmx, Vmx is simultaneously also as the transport velocity of steel plate transport process.Computing formula is as follows:
Vmx = S f Δt - S a Vast × coe Formula (2)
Sf in formula (2) is the distance of finishing mill to roller-way interface point, and Sa is the distance of roller-way interface point to controlled cooling model device, as shown in figure 14.△ t is the result of calculation of formula (1).Vast is the cooling commencing speed from C2a unit cooling calculated with mathematical model.Coe is correction factor, according to onsite application effect, adjusts, and scope is 0.9 ~ 1.2.
Change in finishing mill second control system C2f, is summarized as follows.C2f is after receiving the output parameter milling train maximal rate Vmx from C2g, make the parameter Vfmx=Vmx of original control unit, and do not use the numerical value that original finishing mill control unit self calculates, then make C2f recalculate the F3 ' moment, make the parameter F3=F3 ' of original control unit.Change the service chart of the down speeding procedure that original control unit exports, change as keeping Vmx speed constant always, left the RT1' moment of the transport process switching point of new definition by steel plate tail, trigger the control inputs signal switching of electric machines for roller, complete the operation of rolling in steel plate overall operation speed figure.
The change of the speed control unit C1 of each roller-way group, is summarized as follows.C1, after receiving the output parameter Vmx from C2g, makes the parameter Vrt=Vmx of original control unit, and does not use the preset parameter that each roller-way group control unit self original is preserved.Change the service chart of the down speeding procedure that original control unit exports, when the RT2' moment, after steel plate head arrives interface point, steel plate starts reduction of speed, steel plate speed reaches cooling commencing speed Vast, namely in the A1' moment, triggers the control inputs signal switching of electric machines for roller, instead of original reduction of speed is to zero, just triggers switching.
The change of the speed control unit C1a of controlled cooling model device, is summarized as follows.When in the A1' moment, after triggering the control inputs signal switching of electric machines for roller, motor is taken over by the first class control system C1a of controlled cooling model device, now keep Vast speed, do not need acceleration or deceleration, until in the A2' moment, steel plate enters controlled cooling model device, starts controlled cooling model process.Original needs accelerate to speed Vast from zero.
State in the implementation of new hodograph on the invention, add the rate control module of new global coordination computational speed graph parameter, the control unit of three original processes is combined as a whole, the technological requirement of temperature is started according to cooling, calculate the maximum mill speed of reasonable and identical final pass and steel plate transport velocity, maximally utilise capacity of equipment, reduced the reduction of speed run, reach the object reducing temperature losses of the process.In addition, adopt the least possible operation acceleration, the speed of service figure of down speeding procedure, also can reduce the danger that the electric machines for roller moment load of high-speed rotation is excessive, also slide between minimizing lower surface of steel plate and roller-way the surface of steel plate cut caused.
Beneficial effect
Start the technological requirement of temperature according to cooling, calculate the maximum mill speed of reasonable and identical final pass and steel plate transport velocity, maximally utilised capacity of equipment, reduce the reduction of speed run, reach the object reducing temperature losses of the process.In addition, adopt the least possible operation acceleration, the speed of service figure of down speeding procedure, also can reduce the danger that the electric machines for roller moment load of high-speed rotation is excessive, also slide between minimizing lower surface of steel plate and roller-way the surface of steel plate cut caused.After Baosteel 5 meters of slabs product lines adopt this technical scheme, steel plate declines from the temperature that finishing mill is transported to controlled cooling model device process and decreases more than 10 DEG C.Shown in following figure below, have employed the finish rolling finishing temperature of the steel plate of new solution and the situation of cooling beginning temperature.
Accompanying drawing explanation
The layout schematic diagram of the existing Medium and Heavy Plate Rolling Production line of Fig. 1.
The finish rolling finishing temperature that Fig. 2 is common and cooling start temperature schematic diagram.
The control unit schematic diagram that the speeds control of Fig. 3 milling train, roller-way and controlled cooling model device is relevant.
The hodograph of the steel plate operation of Fig. 4 operation of rolling.
The control unit schematic diagram that the speeds control of the milling train of Fig. 5 operation of rolling, roller-way and controlled cooling model device is relevant.
The control unit schematic diagram that the speeds control of the milling train of Fig. 6 transport process, roller-way and controlled cooling model device is relevant.
The hodograph of the steel plate operation of Fig. 7 controlled cooling model process.
The control unit schematic diagram that the speeds control of the milling train of Fig. 8 controlled cooling model process, roller-way and controlled cooling model device is relevant.
Fig. 9 from last passage be rolled down to steel plate start controlled cooling model whole process steel plate run hodograph
Figure 10 from last passage be rolled down to steel plate start controlled cooling model whole process steel plate run new hodograph.
The speed control unit schematic diagram from milling train to controlled cooling model device that Figure 11 is new.
The internal process of Figure 12 C2g module and the information interaction content schematic diagram with other unit modules.
The input/output argument schematic diagram of the calculating of Figure 13 speed of service figure.
The schematic diagram of Figure 14 interface point dependency relation.
Figure 15 have employed finish rolling finishing temperature and the cooling beginning temperature schematic diagram of the steel plate of new solution.
The steel plate speed of service figure that Figure 16 prior art is corresponding.
The finishing mill final pass operation of rolling of control output of Figure 17 technical solution of the present invention, the new speed service chart of the total tune of roller-way transport process.
Detailed description of the invention
Embodiment
If cut deal produces line and arranges according to finishing mill, controlled cooling model device sequence, roller-way component is 6 groups, the title of each roller-way group is FX1, FX2, FX3, FX4, FX5, AC1 respectively, connected position between FX5 and AC1 is interface point position, interface point distance finishing mill Sf is 58 meters, and interface point distance controlling cooling device entrance distance Sa is 6.8 meters.Connected position between definition FX1 and FX2 is transport process switching point.
Increase the rate control module C2g for global coordination computational speed graph parameter newly.Change C2f, C1, C1a, C2a, increase with C2g communication and change original speed controlling function.By the reconstruct of above newly-increased and original speed control unit module, the speed service chart of the new one seamless connection of realization, reaches the object reducing temperature losses of the process.
For the steel plate of certain TMCP technique, bright control method specifically.If the TMCP technological parameter of this kind requires: finish rolling finishing temperature Tfin is 800 DEG C, it is 780 DEG C that cooling starts temperature Tast.
After the second control system C2f of finishing mill judges that the completed passage of steel plate is the passage second from the bottom of this steel plate, trigger the operation of C2g.
First C2g notifies that the cooling Mathematical Modeling of the second control system C2a of controlled cooling model device carries out the calculating of cooling procedure parameter.
The speed Vast that cooling Mathematical Modeling in C2a calculates cooling beginning is 1.6m/s, and Vast is returned to C2g.
C2g starts the calculating of overall operation figure.Comprise the following steps:
Receive the Vast=1.6m/s from C2a;
The database interface of access production ordering information (PDI), obtains steel plate finished product thickness h=16.05 × 10-3m (i.e. 16.05mm), the finish rolling finishing temperature Tfin=1073K (namely 800 DEG C) of TMCP technique, the cooling of TMCP technique starts temperature Tast=1053K (namely 780 DEG C);
Calculate the required time △ t entering steel from finishing mill throwing steel to controlled cooling model device, steel plate density p=7500kg/m3, specific heat c=635J/ (kgK), Si Difen-Boltzmann constant σ=5.672 × 10-8Js-1m-2K-4, radiance ε=0.8.According to formula (1),
Δt = h × ρc 6 ϵσ × ( Tast - 3 - Tfin - 3 )
Obtain △ t=13.2s.；
Calculate output parameter milling train maximal rate Vmx, Vmx is simultaneously also as the transport velocity of steel plate transport process.By formula (2),
Vmx = S f Δt - S a Vast × coe
Given coe=1.0, Sf=58m, Sa=6.8m, known Vast=1.6m/s, obtains Vmx=6.48m/s.
After the calculating of C2g overall operation graph parameter Vmx completes, C2g sends to C2f Vmx, and C2g sends to the C1 of each roller-way group Vmx and Vast.
C2f is after receiving the output parameter milling train maximal rate Vmx6.48m/s from C2g, make the parameter Vfmx=6.48m/s of original control unit, and do not use the numerical value that original finishing mill control unit self calculates, then make C2f recalculate the F3 ' moment, make the parameter F3=F3 ' of original control unit.Change the service chart of the down speeding procedure that original control unit exports, change as keeping Vmx speed to be that 6.48m/s is constant always, the RT1' moment transporting switching point between FX1 and FX2 roller-way group is left by steel plate tail, trigger the control inputs signal switching of electric machines for roller, switch to and carry out speeds control by the C1 of each roller-way group, complete the operation of rolling in steel plate overall operation speed figure.
The C1 of FX2, FX3, FX4, FX5, AC1, after receiving the output parameter Vmx6.48m/s from C2g, makes the parameter Vrt=6.48m/s of original control unit, and does not use the preset parameter that each roller-way group control unit self original is preserved.Change the service chart of the down speeding procedure that original control unit exports, when the RT2' moment, after steel plate head arrives the interface point between FX5 and AC, steel plate starts reduction of speed, steel plate speed reaches cooling commencing speed Vast1.6m/s, namely in the A1' moment, trigger the control inputs signal switching of electric machines for roller, switch to the C1a of controlled cooling model device to carry out speeds control.
When in the A1' moment, after triggering the control inputs signal switching of electric machines for roller, motor is taken over by the first class control system C1a of controlled cooling model device, now speed is kept to be Vast1.6m/s, do not need acceleration or deceleration, until steel plate enters controlled cooling model device, start controlled cooling model process.
The control method that the temperature of a kind of steel plate of the present invention in Medium and Heavy Plate Rolling Production line process declines has been applied to Heavy Plate of Baosteel 5 meters and has produced line, through practice principle, respond well, steel plate declines from the temperature that finishing mill is transported to controlled cooling model device process and decreases more than 10 DEG C.The technology of the present invention adapts to wide, and easy to use, equipment investment is few, on the heavy and medium plate mill production line be disposed in order according to finishing mill, controlled cooling model device with Automated condtrol, this technology can be promoted the use of completely, has wide Technique Popularizing prospect.

Claims (11)

1. the control method of the temperature decline of steel plate in Medium and Heavy Plate Rolling Production line process, be mainly used in the steel plate rolling of Medium and Heavy Plate Rolling Production line and the control method of transporting velocity, described Medium and Heavy Plate Rolling Production line order comprises: the final pass milling train of finishing mill, 1 ~ N group rollgang after milling train, controlled cooling model device and thermal straightening machine, the control method of described steel plate rolling and transporting velocity is the speed automatic control method of a total tune, comprise the speeds control of total tune of the finishing mill final pass operation of rolling, roller-way transport process, it is characterized in that
N：5～9,
After the expectation of known steel plate course of conveying starts temperature (the finish rolling finishing temperature of TMCP technique), expectation end temp (cooling of TMCP technique starts temperature), steel plate overall operation hodograph is considered, reduce the reduction of speed of overall process light plate, pause, make the rolling maximal rate of finishing mill final pass identical with the numerical value that roller-way transports maximal rate, obtain suitable RPM schedule
Setting Vmx is the maximum mill speed of steel plate at finishing mill final pass, is also the even speed in transport process,
In the F1 moment, namely steel plate is entering the finishing mill final pass milling train moment, and steel plate starts mobile on roller-way,
In the F2 moment, namely steel plate enters finishing mill final pass milling train and starts the rolling moment, and steel plate continues to accelerate,
In the F3' moment, namely the mill speed of steel plate reaches the maximum Vmx moment, and after this speed remains on maximum Vmx,
Until the F5' moment, namely steel plate leaves milling train, completes this passes, and speed still remains on Vmx,
In the RT1' moment, namely steel plate tail leaves certain the group roller-way group in milling train the 2 to 4 group roller-way group below, and this roller-way group, also referred to as transport process switching point, triggers the control inputs signal switching of electric machines for roller,
Described electric machines for roller are controlled by the speed control unit C1 of each roller-way group, and steel plate still continues the transport velocity keeping Vmx;
In the RT2' moment, steel plate head reaches interface point, and interface point is defined as the position at the 1st group or the 2nd group roller-way group place before controlled cooling model device, and then, steel plate starts reduction of speed;
In the A1' moment, steel plate speed reaches cooling commencing speed Vast, and trigger the control inputs signal switching of electric machines for roller, motor is taken over by the first class control system C1a of controlled cooling model device, and keeps Vast speed;
In the A2 ' moment, that is, steel plate enters the controlled cooling model device moment, and now the temperature of steel plate reaches or cooling close to TMCP technological requirement starts temperature.
2. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, it is characterized in that, the finish rolling finishing temperature of described TMCP technique: 950 ~ 700 DEG C, the cooling of described TMCP technique starts temperature: 900 ~ 750 DEG C.
3. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, is characterized in that,
The realization of the speed of service figure of above-mentioned whole process newly, need a rate control module C2g for global coordination computational speed graph parameter, the function of C2g is before last passage of finishing mill starts rolling, according to the finish rolling finishing temperature of the steel plate required in production ordering, cooling starts temperature, require C2a, speed Vast when the cooling that cooling Mathematical Modeling in the second control system of i.e. controlled cooling model device calculates this steel plate starts, and the final size after completing in conjunction with steel plate rolling, calculate the maximum mill speed Vmx of suitable final pass, this velocity amplitude is also the transport velocity of the transport process of steel plate, finally result of calculation (i.e. Vmx) is sent to C2f, the i.e. second control system of finishing mill, with C1 module, namely speed control unit module when roller-way group transports steel plate.
4. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, is characterized in that,
Control module C2g is provided with the communication interface with the C1 of C2f, C2L, C2a, each roller-way group, is also provided with the interface of access production ordering (PDI) relevant information,
Complete the rolling of passage second from the bottom of finishing mill at steel plate after, before namely in the end a passage starts rolling, trigger this control module C2g and operate.
5. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, is characterized in that,
The internal process of described C2g module running and as follows with the information interaction content of other unit modules:
The second control system C2f of finishing mill is after steel plate rolling completes passage second from the bottom, and notice C2g starts to start, and C2g module notifies that the second control system C2a of controlled cooling model device starts to calculate respectively;
The cooling Mathematical Modeling of C2a completes computational process, and the cooling commencing speed Vast in result of calculation is returned to C2g;
C2g, after receiving the Vast from C2a, starts the calculating of overall operation hodograph;
After C2g completes the calculating of overall operation hodograph, the maximal rate Vmx in result of calculation, send to C2f, as rolling maximal rate, and require that C2f recalculates the speed of service figure of the operation of rolling;
C2g is the maximal rate Vmx in result of calculation, and send to the motor control unit C1 of each roller-way group, Vmx is as transport process maximal rate.
6. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, is characterized in that,
The concrete calculation procedure of the overall operation hodograph in the internal process of described control module C2g is:
1) the cooling commencing speed Vast from C2a unit cooling calculated with mathematical model is accepted;
2) access production ordering information (PDI) interface, obtain the mill product thickness h of steel plate, the finish rolling finishing temperature Tfin of TMCP technique, the cooling of TMCP technique start temperature Tast;
3) use according to the steel plate of radiant heat transfer formula proving from the computing formula leaving the time required for milling train to controlled cooling model device, calculating required time △ t can allow steel plate decline in the operating temperature of roller-way, meets temperature drop value corresponding to TMCP technological parameter (finish rolling finishing temperature Tfin-cools and starts temperature Tast);
4) according to the distance transporting required time △ t and product line layout calculated, calculate the machine maximal rate Vmx that final pass rolls, Vmx is also the maximal rate of roller-way transport process simultaneously.
7. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, is characterized in that,
The computing formula of △ t is as follows:
formula (1)
In formula (1),
H is the finished product thickness (m) after steel plate rolling completes,
Tast is that the cooling of TMCP technique starts temperature (unit: Kelvin K),
Tfin is the finish rolling finishing temperature (unit: Kelvin K) of TMCP technique,
ρ is the density (kg/m of steel plate when high temperature 3, 7300 ~ 7800kg/m 3),
C is the specific heat of steel plate when high temperature (J/ (kgK), 600 ~ 750J/ (kgK)),
σ is Si Difen-Boltzmann constant (σ=5.67 × 10 -8w/ (m 2k 4)), the numerical value of above-mentioned three parameters and span, for these those skilled in the art are in common knowledge.
ε is the radiance of high-temperature steel plate plane to space radiation, and numerical value is between 0.6 ~ 0.8.
ε can save according to " model of hot strip rolling and control " 5.2.1 the method introduced, and tries to achieve after carrying out temperature statistics.
8. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, is characterized in that,
The computing formula of output parameter milling train maximal rate Vmx is as follows:
formula (2)
In formula (2),
Sf is the distance (m, scope 5 ~ 20m) of finishing mill to roller-way interface point 1,
Sa is the distance (m, scope 0.8 ~ 10m) of roller-way interface point 2 to controlled cooling model device,
△ t is the result of calculation (s, scope 0.1 ~ 30s) of formula (1),
Vast is the cooling commencing speed (m/s, scope: 0.3 ~ 3.0m/s) from C2a unit cooling calculated with mathematical model,
Coe is correction factor, and scope is 0.9 ~ 1.2.
9. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, is characterized in that,
Finishing mill second control system C2f runs as follows:
The second control system C2f of described finishing mill, after receiving the milling train maximal rate Vmx from the output parameter of rate control module C2g, makes the parameter of original control unit, i.e. the maximum Vfmx=Vmx that reaches of the mill speed of steel plate, then,
The mill speed making the second control system C2f of finishing mill recalculate steel plate reaches the moment of maximum: the F3 ' moment, makes the parameter of original control unit, and namely the mill speed of steel plate reaches the moment F3=F3 ' of maximum.
10. the control method of the temperature decline of a kind of steel plate as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process, is characterized in that,
The speed control unit C1 of each roller-way group runs as follows:
Described speed control unit C1, after receiving the output parameter Vmx from C2g, makes the parameter Vrt=Vmx of original control unit,
When the RT2' moment, after steel plate head arrives interface point, steel plate starts reduction of speed, and steel plate speed reaches cooling commencing speed Vast, namely in the A1' moment, triggers the control inputs signal switching of electric machines for roller.
The control method that the temperature of 11. a kind of steel plates as claimed in claim 1 in Medium and Heavy Plate Rolling Production line process declines, is characterized in that,
The speed control unit C1a of described controlled cooling model device runs as follows:
When in the A1' moment, after triggering the control inputs signal switching of electric machines for roller, motor take over by the first class control system C1a of controlled cooling model device, now maintenance Vast speed, and do not need acceleration or deceleration, until in the A2' moment, steel plate enters controlled cooling model device.
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CN112676360A (en) * 2020-12-08 2021-04-20 陕西龙门钢铁有限责任公司 Method and device for controlling rotating speed of hot billet discharging motor of heating furnace in steel rolling workshop
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