CN105215058B - Control method for temperature reduction of steel plates in medium-thickness plate rolling production line process - Google Patents

Control method for temperature reduction of steel plates in medium-thickness plate rolling production line process Download PDF

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CN105215058B
CN105215058B CN201410302063.2A CN201410302063A CN105215058B CN 105215058 B CN105215058 B CN 105215058B CN 201410302063 A CN201410302063 A CN 201410302063A CN 105215058 B CN105215058 B CN 105215058B
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steel plate
speed
roller
rolling
temperature
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CN105215058A (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 invention relates to a control method for temperature reduction of steel plates in a medium-thickness plate rolling production line process, in particular to an automatic speed control method in a final rolling process of a rolling mill and in a roller way conveying process of the steel plates from a finish rolling mill to a control cooling device, and aims to satisfy the TMCP process parameter requirements of smaller difference between the final rolling temperature of finish rolling and the cooling beginning temperature of some products. The technical scheme of the invention is suitable for a modern medium-thickness plate production line arranged by a finish rolling mill and a control cooling device and having an automatic control system. The technical scheme of the invention gives a velocity diagram (10) of integrated steel plate operation satisfying the seamless speed joint between the steel polishing process and the steel plate transportation process in final rolling considering the final rolling temperature and cooling beginning temperature process requirements; and the technical scheme newly adds a speed control module for global coordinative calculation of parameters of the velocity diagram for realizing the velocity diagram of integrated steel plate operation, and improves new speed control schemes of speed control modules of traditional all units.

Description

A kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate
Technical field
The present invention relates to the automation field of Medium and Heavy Plate Rolling Production line, in particular it relates to a kind of steel plate exists The control method of temperature drop in Medium and Heavy Plate Rolling Production line process, more particularly, to according to milling train, pre-straightening machine, controls cooling dress Put the controlling party from finishing mill temperature drop to the journey control chiller for the steel plate on the Medium and Heavy Plate Rolling Production line of arrangement Method.The steel plate of present invention control method of temperature drop in Medium and Heavy Plate Rolling Production line process relates generally to Medium and Heavy Plate Rolling life Steel plate rolling in producing line and the control method of transporting velocity.
Technical background
The Medium and Heavy Plate Rolling Production line of modernization is generally disposed with heating furnace, milling train, controls chiller, thermal straightening at present Machine etc., as shown in figure 1, during producing line layout design it is contemplated that steel plate maximum finished product length demand, milling train and control chiller Between usually more than 60 meters of distance.
The production procedure of described Medium and Heavy Plate Rolling Production line according to the present invention is：
After steel plate completes the rolling of final pass in milling train, rollgang moves to control steel plate after finishing mill Before chiller, then steel plate enters and controls chiller to carry out water-spraying control.For cold with control using controlled rolling But the steel plate (also referred to as TMCP, thermo-mechanical control process) of technique productions, for reaching in design Plate product performance, must assure that production process meets the requirement of some technological parameters aborning, such as finish rolling start rolling temperature, Finish rolling finishing temperature, cooling started temperature, rate of cooling, cooling termination temperature etc., wherein finish rolling finishing temperature, cooling start Temperature is that (more detailed content is visible for the Properties Control target of important employing TMCP technique steel plate《Chinese Medium and Heavy Plate Rolling technology With equipment》, Wang Guodong chief editor, 2009, metallurgical industry publishing house, the controlled rolling of the 9th chapter cut deal and control cooling).Finish rolling Finishing temperature refers to that finishing mill rolling completes the steel billet temperature of last passage, and cooling started temperature refers to that steel plate will enter Chiller is controlled to start temperature during water-spraying control.
Due to each TMCP effects of process parameters steel plate tissue including finish rolling finishing temperature, cooling started temperature and power Learn the key factor of performance, after completing the design of alloy of product, product design engineer can be according to the power of final products Learn performance etc. to require, provide the design output of TMCP technological parameter.
In recent years, reduce product cost pressure under, product design engineer reduce as far as possible micro- in cut deal It is proposed that more and more overcritical TMCP technological parameter under the conditions of alloy content, for some products, according to product composition and property The finish rolling finishing temperature that design exports can be required less with the difference of the numerical value of cooling started temperature, such as, the design of certain product is defeated Go out TMCP technological parameter requirement：770 DEG C of finish rolling finishing temperature, 740 DEG C of started temperature of cooling.
The less steel plate of difference of the numerical value of the finish rolling finishing temperature for this kind of TMCP technological requirement and cooling started temperature, In order to be able to reach the technological parameter of product design, be necessary for searching can reduce steel plate from milling train be transported to control chiller mistake The method of the temperature drop in journey.
This is because usually more than 60 meters of the distance between milling train and control chiller, according to conventional steel plate output side Method, the temperature difference between finish rolling finishing temperature and cooling started temperature is larger, and this is with steel billet temperature, steel plate width, steel plate length, steel Distance between plate thickness, rollgang rotating speed, finishing mill and control chiller, air themperature etc. have relation (to ask for an interview《Strip steel heat The model of tandem rolling and control》, Sun Yikang writes, and 2002, metallurgical industry publishing house, during 5.2.1 section strip steel (steel billet, made-up belt) transmission Temperature drop), but usual temperature drop is on 50 DEG C.In actual production, the common finish rolling finishing temperature of steel plate and cooling start temperature Line of writing music is as shown in Figure 2.
In open source literature at home and abroad, seldom it is related to minimizing steel plate and is transported to control chiller mistake from heavy and medium plate mill The technical scheme of the air cooling temperature drop in journey.The technical literature retrieving with this end in view only has the patent of Japanese JFE company JP4935420.The core of this technical scheme is to increase the device of similar hot-rolled intermediate billet thermal insulation cover, reduces the steel in output procedure Plate temperature drop.But this technical scheme needs to increase no small investment, adds new attemperator, and when steel plate occurs Head ski -up When, this is often inevitable in actual production, and the head of steel plate easily bumps against on new equipment, has and causes production accident Risk.
Technology according to the present invention scheme, the content being related to includes：According to milling train, control in chiller order arrangement Steel plate on heavy plate rolling production line from finishing mill to control chiller milling train, roll mill run-out table, control cooling dress The speed automatic control method of the total tune put.The technical background of technical scheme to illustrate the invention, below first brief review Existing modern production the line generally milling train of employing, roller-way, the method for control speed of control chiller, and retrieve The controlling technology of velocity plan content of the documents such as patent.
Existing modern production line generally realizes automatically controlling of production by computer control system, and according in producing line Equipment arrangement be divided into several control units.Main logic unit includes：Heating furnace, milling train control unit, control cooling Device control units, the control unit of auxiliary includes：Thermal straightening machine control unit, several roller-way control units etc..
In addition, described main logic unit includes two stage control system, wherein automated system based on one-level, two grades are Process Control System.Described Basic automation level mainly completes the related ginseng such as the sequential control of equipment, position control, speed controlling The real-time control of number.Described process control level mainly executes mathematical model control function, carries out the complicated calculations of process model, complete Become the setting task of procedure parameter, in procedure parameter, include hodograph (that is, the song of time and length velocity relation of steel plate operation Line).(visible in more detail《Chinese Medium and Heavy Plate Rolling technology and equipment》, the 13rd chapter computer control system).With milling train, roller-way, Control the related control unit such as Fig. 3 of the speed controlling of chiller, wherein, the roller-way on rolling line is divided into some groups of (in figures It is expressed as N group), every group at least includes a conveying roller and corresponding driving motor.
In Fig. 3, Mf is finishing mill main driving motor, and M is roller-way driving motor, and Ma is the transmission electricity controlling in chiller Machine, C1f is the first class control system of finishing mill, and C1 is each speed control unit that roller-way group transports during steel plate, and C1a is that control is cold But the first class control system of device, C2f is the second control system of finishing mill, and C2a is the Two-stage control system controlling chiller System.Wherein, roller-way group 1～roller-way group N (N：5～9) corresponding driving motor M receives 3 tunnel input control signals, corresponds to respectively not Same Plate Production process, these three processes are the operation of rolling, roller-way transport process, control cooling procedure.
Heavy and medium plate mill is reversable mill, when steel plate carries out the rolling of reciprocal multi-pass in milling train, each passage Steel plate hodograph such as Fig. 4 (select from《Heavy Plate Production》Sun Benrong etc., 1993.1 metallurgical industry publishing houses, 4.3.3 section rolling RPM schedule) shown in.
The hodograph that Fig. 4 operation of rolling light plate runs.
In Fig. 4, Vfmx is the mill speed in this passage maximum for the steel plate, and F1 moment steel plate is on entering mill approach table Start to move, F2 moment steel plate enters milling train to start to roll, and steel plate continues to accelerate, and the mill speed of F3 moment steel plate reaches maximum Value Vfmx, hereafter speed be maintained at maximum Vfmx, until the F4 moment, steel plate starts reduction of speed, F5 moment, and steel plate leaves milling train, Complete this passes, F6 moment, stop motion on roller-way after leaving milling train for the steel plate, prepare rolling of reverse lower passage System.
Above-mentioned parameter Vfmx, F1, F2, F3, F4, F5, F6 are set by the milling train in finishing mill second control system C2f Model is calculated.Before steel plate starts rolling, these parameters are sent to the one of finishing mill by finishing mill second control system C2f Level control system C1f.In the operation of rolling, C1f be responsible for steel plate speed of service figure be converted into finishing mill main driving motor Mf and The real time motor rotating speed control instruction of each roller-way group driving motor M that steel plate movement is covered.Now, finishing mill, roller-way, control The three of following Fig. 5 of input signal of the related control unit of the speed controlling of chiller, in figure roller-way group driving motor M reception Solid line in the signal of road represents the actual input signal working, and that is, motor M performs the real time motor rotating speed in this road signal Control instruction, dotted line represents Puiescent, inoperative input signal at that time.
The control unit schematic diagram of the speed controlling correlation of milling train, roller-way, control chiller in Fig. 5 operation of rolling.
After the completion of all passages of steel plate all roll, steel plate rests on the roller-way after the milling train of the final pass of finishing mill On, then, start steel plate from milling train to the transport process controlling chiller.The speed-control scheme of generally this process is simple Single, that is, before steel plate motion arrives, roller-way starts the rotation of fixed rotating speed to each roller-way group, the concrete numerical value of this fixed rotating speed and Start rotate moment, by each roller-way group speed control unit C1 according to give Interal fixation transporting velocity Vrt change to Go out.
Now, the input signal below figure of the control unit of speed controlling correlation of finishing mill, roller-way, control chiller Shown in 6.In figure, the solid line in the three road signals that roller-way group driving motor M receives represents the actual input signal working, i.e. electricity Machine 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 of the speed controlling correlation of milling train, roller-way, control chiller in Fig. 6 transport process.
After being referred to as the position of interface point 1 on steel plate head is through roller-way, (see figure, interface point position is usually located at control 1-2 group roller-way group before cooling device), steel plate starts reduction of speed to zero, then waits steel billet temperature to reach TMCP technique ginseng After the cooling started temperature that number is specified, steel plate setting in motion, entered with the speed of Vast and control chiller.
Chiller is controlled to have started to spray water before this, the control parameter such as the open mode of water spray collector, discharge, by Control the cooling mathematical model in the second control system C2a of chiller to precalculate to obtain, control when beginning to cool down is cold But the movement velocity figure (that is, the curve of time and length velocity relation) that device and steel plate cover lower each roller-way group is also by cooling down number Model precalculates and is given.Before beginning to cool down, these parameters are sent to by the second control system C2a controlling chiller Control the first class control system C1a of chiller.
After steel plate begins to cool down, control control system C1a of chiller, C1a is responsible for steel plate speed of service figure to turn Change the real time motor rotating speed control controlling the driving motor Ma of cooling dress and the mobile each roller-way group driving motor M being covered of steel plate into System instruction, and measurement temperature, real-time adjustment Ma and and the steel plate according to the temperature instrumentation being arranged on after control chiller The real time motor rotating speed control instruction of each roller-way group driving motor M that movement is covered, carries out feedback control.Control chiller Second control system C2a in the cooling precalculated hodograph of mathematical model more complicated, due to main in technical solution of the present invention Speed Vast beginning to cool down in hodograph to be concerned about, can simplify schematically as follows figure and (ask for an interview in detail《Chinese Medium and Heavy Plate Rolling skill Art and equipment》, Section of 10.5 cold mathematical model of control).
Fig. 7 controls the hodograph that the steel plate of cooling procedure runs.
In the figure 7, A1 moment steel plate starts to move on the roller-way entering before controlling chiller, and A2 moment steel plate enters Chiller is controlled to begin to cool down, speed now is Vast, that is, steel plate speed when beginning to cool down, one section of steel plate even running After time, start slow Accelerating running in the A3 moment, until A4 moment steel plate leaves control chiller, complete to control cooled Journey, stop motion on the roller-way before the A6 moment runs to thermal straightening machine, prepare to start to align passage.Above-mentioned parameter Vast, A1, A2, A3, A4, A5 etc. are calculated by the cooling mathematical model in the second control system C2a controlling chiller.This When, finishing mill, roller-way, following Fig. 8 of input signal of the control unit of speed controlling correlation of control chiller, in figure roller-way Solid line in the three road signals that group driving motor M receives represents the actual input signal working, and that is, motor M performs this road letter Real time motor rotating speed control instruction in number, dotted line represents Puiescent, inoperative input signal at that time.
The milling train of Fig. 8 control cooling procedure, roller-way, the control unit of the speed controlling correlation of control chiller are illustrated Figure.
The purpose of technical solution of the present invention be reduce steel plate from milling train be transported to control chiller during at a temperature of Fall, so starting control cooling from the steel plate that is rolled down to starting last passage, is the process that technical solution of the present invention is concerned about, It is necessary that the hodograph that original for the automation control system in whole process steel plate is run gives completely to present.
Fig. 9 starts, from the steel plate that is rolled down to starting last passage, the speed that the steel plate of the whole process controlling cooling runs Degree figure.
The RT2 moment in Fig. 9 is interface point position on roller-way for the steel plate head, and triggering steel plate is controlling chiller The moment point of reduction of speed on front roller-way, the steel plate at the uniform velocity transporting velocity that Vrt is given for control unit C1.
After the retrieval heavy and medium plate mill patent related with the speed controlling of roller-way and other open source literatures, do not find to subtract Few steel plate is transported to from milling train and controls the technical scheme being reduced to purpose at a temperature of during chiller.
For example, a class technical scheme is concerned with solving the velocity of rotation coupling of reversable mill main driving motor and electric machines for roller And determine that electric machines for roller start the reasonable moment starting, in brief, it is each roller-way group that finishing mill and steel plate movement are covered Speed controlling matching and coordination between driving motor.
Its more valuable scheme includes：The CN200780008900.9 of Siemens Company《Operation for reversable mill Method》It is proposed that during reversible rolling, how to determine the roller-way group of the rational energy-conservation mated with mill milling hodograph Startup time, and give operation method and the device of corresponding reversable mill.Shanghai Meishan Iron＆ Steel Co., Ltd CN201210083526.1《Speed adaptive between roller-way and milling train controls》, adaptive by the loading moment of electric machines for roller Should control, for mating of the speed moment between roller-way and milling train.The speed of coupling between other similar milling train and electric machines for roller Degree control program, also includes 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, that is, to steel plate rolling The improvement of hodograph.The purpose of the technical scheme of the JP2001-62503 of Kawasaki Steel is to reach accurate control steel plate reversible Steel plate stop position after the completion of passage in rolling, method is by the precise and tiny adjustment to mill speed figure.Kawasaki Steel US4232369A gives computer control systems and the control method of reversable mill mill speed control.
What above two class technical schemes were concerned about is the speed controlling details of milling train and the attached roller-way of milling train, that is, in concern Fig. 3 The design of C1f, C2f internal speed control function and realization.
Under relatively, what technical solution of the present invention was concerned about is the speed from finishing mill to the entirety controlling chiller Control method, thus reach reduce steel plate convey temperature drop purpose, described later the technical scheme is that set up whole All fronts speed coordinating control module on the automation control system of body, thus it is more reasonably total to instruct C2f, C1, C2a to provide The hodograph of body.What technical solution of the present invention was concerned about is the speed controlling side from finishing mill to the entirety controlling chiller Method.
A class technical scheme is also had to pay close attention to perfect, the JP2005- of such as JFE company of the speed controlling of electric machines for roller body 98828 it is proposed that be directed to the monitoring method of the electric machines for roller abnormal torque load of conveying deformed steel strip steel plate, that is, in concern Fig. 3 The improvement of C1 and perfect.
Other, a class technical scheme is for arranging two pieces in roller-way group and roller table speed when two or more transports controls Scheme, it is important that reducing the distance between steel plate and steel plate, thus improving rhythm of production, but simultaneously need to prevents between steel plate Collide, production accident occurs.Its specific technical scheme includes：The CN103372572 of Baoshan Iron ＆ Steel Co., Ltd 《A kind of control method improving roughing mill milling rhythm》, according to slab detection means end to end, setting prevents slab collision Condition, reduces the distance between slab on roller-way.The WO0056476 of Kawasaki Steel, by increasing photographic head, prevents between steel plate Collision.This kind of technical scheme is entirely different with the focus of technical solution of the present invention, the production that technical solution of the present invention is improved Journey is accomplished to for finishing mill rolling and starts to control the process between cooling, because steel plate is controlling the speed of service in chiller Generally little than maximum mill speed is many, does not possess polylith steel and waits the precondition entering control chiller, so No comparability.
Also have the technical scheme that a class technical scheme is for the control beginning to cool down temperature, this and technical solution of the present invention Focus identical, but investigate these technical schemes it can be seen that patent except the above Japanese JFE company of introduction JP4935420, the core of this technical scheme is to increase steel plate insulation closure assembly, reduces the steel plate temperature drop in output procedure.Other Control device is all the method by increasing cooling way, reduces steel billet temperature, thus increasing temperature when steel plate rolling completes With temperature difference when beginning to cool down.This is tried to go south by driving the chariot north with the starting point of technical solution of the present invention, need not compare, such as JFE company JP2005-979, the CN102000703 of Hitachi, Ltd《Hot-rolling mill goes out side temperature control equipment and control method》.
In addition, the CN101745549 of Baoshan Iron ＆ Steel Co., Ltd《A kind of controlling party of hot-continuous-rolling strip steel steel feeding temperature Method》It is by adjusting the delay table speed between hot rolling roughing mill and finishing mill, the entry temperature at finishing of strip steel being controlled System.This patent is the thinking using dynamic variable specification, and hot-rolled product description is classified, and every kind of specification is being given out The each equipment (including pre-straightening, intermediate heater, cutter, De-scaling box) in addition to delay table from roughing mill to finishing mill Narrower speed set point, according to the roughing mill middle base temperature that measures of outlet and desired entry temperature at finishing (warp Test value), calculate the temperature drop in each equipment section in addition to delay table for the middle base, thus estimating stopping in delay table Stay the time, and then determine delay table speed.
This technical scheme and technical solution of the present invention have in common that known steel plate course of conveying started temperature, After expecting end temp, the carrying out of overall hodograph is considered, select suitable RPM schedule.
However, this technical scheme is with the difference of technical solution of the present invention：
One is the difference of producing line type and control object, the control object of this technical scheme be be disposed with roughing mill, in Between roller-way, pre-straightening machine, intermediate heater, cutter, in the middle of the conveying on the hot-rolled strip production line of De-scaling box base centre Roller-way, the control object of technical solution of the present invention is to be disposed with finishing mill, roller-way, the Heavy Plate Production line of control chiller Finishing mill, roller-way, control chiller, i.e. the control of this technical scheme is output as the speed of the delay table as single devices Degree, the control of technical solution of the present invention is output as the finishing mill final pass operation of rolling, the total tune of roller-way transport process Speed service chart and control chiller start into the speed controlling before steel；
Two is the difference controlling purpose, and the purpose of this technical scheme is to ensure that suitable finish rolling steel feeding temperature empirical value, both Can not be too low, lead to two-phase section to roll, again can not be too high, lead to iron scale blocked up, so target temperature interval for 900～ Between 1050 degrees Celsius, the cooling started temperature of the TMCP technique that technical solution of the present invention is necessary to ensure that, low many of temperature range, It is desirable to reduce transport process temperature drop as far as possible between 600～850 degrees Celsius；
Three is that concrete technical scheme is different, and this technical scheme is mainly to determine delay table speed switching point and selects properly Delay table speed, the technical scheme is that changing the speed service chart of the last rolling pass of finishing mill, with maximum rolling Speed throws steel, and starts roller-way transport process at a same speed, the speed of service graph parameter such as maximum mill speed of milling train by Newly-increased speed total tune module is given.
In addition, the actual defects that this technical scheme exists are that middle base acceleration, down speeding procedure are excessive, easily cause roller-way Produce and middle base lower surface between and slide, bring cut to middle base lower surface.
The innovative point of technical solution of the present invention is, one is that the speed service chart of total tune can play to greatest extent The potentiality of equipment, reduce the steel plate temperature drop in transport process to greatest extent；Two is operation acceleration as few as possible, down speeding procedure Speed of service figure, it is possible to reduce the excessive danger of the electric machines for roller moment load of high-speed rotation, also reduce lower surface of steel plate with Slide between roller-way the surface of steel plate cut causing.
In sum, prior art：Steel plate is accomplished to, from the rolling of last rolling pass, the production starting to control cooling Journey, has been divided into the independent operation of rolling, roller-way transport process, pre-straightening process, has controlled cooling procedure, corresponded to different respectively Speed control unit, each unit carries out speed controlling according to the steel plate service chart of this unit alone, and (service chart specifically asks for an interview figure 4th, Fig. 7 and Fig. 9), the control of front process will not consider the temperature requirement of rear operation, more not entering to overall hodograph Row is considered, and sees that the technological parameter that whether can reach product design requires.The i.e. operation of rolling, the speed controlling of steel plate transport process Do not consider that steel plate is entering whether cooling started temperature when controlling chiller requires in accordance with TMCP technological parameter.
Hodograph such as Figure 16 that the corresponding steel plate of prior art runs.
In place of the deficiencies in the prior art it is：In recent years, under the pressure reducing product cost, product design engineer is to the greatest extent It is proposed that more and more overcritical TMCP technological parameter under the conditions of the microalloy content in cut deal may be reduced, to some products For, inclined with the difference of the numerical value of cooling started temperature according to the finish rolling finishing temperature of product composition and performance requirement design output Little.And the common steel plate of existing cut deal producing line transports control method, cause steel plate from finishing mill to controlling chiller Actual temperature drop be more than using TMCP technique some products design output require.It is right that prior art fails fully to meet The requirement answered, or prior art fail with most economical cost, simplicity, optimize approach and technique fully meet corresponding Require.
Content of the invention
The purpose of technical solution of the present invention is that possess Automated condtrol for according to finishing mill, control chiller arrangement The modernization cut deal producing line of system, provides the finishing mill final pass operation of rolling, the speed of the total tune of roller-way transport process Degree control method, thus reducing temperature drop during milling train is transported to control chiller for the steel plate, meeting and adopting TMCP The requirement of the design output parameters such as the finish rolling finishing temperature of some products of technique, cooling started temperature.
Content according to the present invention includes：Medium and Heavy Plate Rolling Production line according to milling train, control chiller order arrangement On steel plate from finishing mill to controlling the milling train of chiller, the total tune rolling mill run-out table, controlling chiller Speed automatic control method.
The difference of the finish rolling finishing temperature for the product of some employing TMCP techniques and cooling started temperature is less than normal, 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 inclusion milling train last The operation of rolling of passage, steel plate are transported to the speed controlling of the automatization of the roller-way transport process controlling chiller from finishing mill Method.
Technical solution of the present invention is as follows：
A kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for steel plate, relates generally to for middle thickness The steel plate rolling of plate rolling line and the control method of transporting velocity, described Medium and Heavy Plate Rolling Production line order includes：Finish rolling The final pass milling train of machine, 1～N group rollgang after milling train, control chiller and thermal straightening machine, described steel plate rolling and defeated Send speed control method be a total tune speed automatic control method, including the finishing mill final pass operation of rolling, roller The speed controlling of the total tune of road transport process it is characterised in that
N is 5-9,
Expectation started temperature (finish rolling finishing temperature of TMCP technique), expectation end temp in known steel plate course of conveying After (the cooling started temperature of TMCP technique), steel plate overall operation hodograph is considered, reduce overall process light plate Reduction of speed, pause, make the rolling maximal rate of finishing mill final pass identical with the numerical value that roller-way transports maximal rate, closed Suitable RPM schedule,
Setting Vmx is the maximum mill speed in finishing mill final pass for the steel plate, is also the even speed in transport process,
In the F1 moment, that is, in the entrance finishing mill final pass milling train moment, steel plate starts to move on roller-way steel plate,
In the F2 moment, that is, steel plate enters finishing mill final pass milling train and starts to roll the moment, and steel plate continues to accelerate,
In the F3' moment, that is, the mill speed of steel plate reaches the maximum Vmx moment, and hereafter speed is maintained at maximum Vmx,
Until the F5' moment, that is, steel plate leaves milling train, completes this passes, speed remains at Vmx,
In the RT1' moment, that is, steel plate tail leave in milling train the 2 to 4th group roller-way group below certain organize roller-way group, this roller Road group is also referred to as transport process switching point, and the control input signal of triggering electric machines for roller switches,
Described electric machines for roller are controlled by the speed control unit C1 of each roller-way group, and steel plate continues to keep Vmx's to transport speed Degree；
In the RT2' moment, steel plate head reaches interface point, the definition of interface point for control the 1st group before chiller or The position that 2nd group of roller-way group is located, then, steel plate starts reduction of speed；
In the A1' moment, steel plate speed reaches cooling commencing speed Vast, and the control input signal of triggering electric machines for roller is cut Change, motor is taken over by the first class control system C1a controlling chiller, and keeps Vast speed；
In the A2' moment, i.e. steel plate enters and controls the chiller moment, and now the temperature of steel plate can reach or close The cooling started temperature of TMCP technological requirement.
The definition of interface point, for controlling the position at the 1st group before chiller or the 2nd group roller-way group place, specifically adopts 1st group or the 2nd group of position is arranged in the electrical automation system design of production line.
According to technical scheme of the present invention, TMCP technique, it is also called controlled rolling and produces with Controlled cooling process (TMCP, thermo-mechanical control process), this Plate Production technique is ripe in last century, be on One of maximum scientific and technological progress of century metallurgical industry.
TMCP is normally defined：On the basis of adjustment steel chemical composition, by the temperature system in the operation of rolling Degree, deformation system and roller repairing system etc. control effectively, and significantly change steel microstructure and so that it is obtained well comprehensive Close the rolling technique of mechanical property (certainly《Chinese Medium and Heavy Plate Rolling technology and equipment》9.4 section controlled rolling rollings cool down with controlling).
This is substantially a kind of manufacturing technique method that hot rolling deformation and steel heat treatment are combined, this side Method requires production process to meet the requirement of some given technological parameters.Finish rolling finishing temperature and cooling started temperature are therein Two parameters, for TMCP technique, this two technological parameters, for different steel grades, are to have incomplete same scope 's.
The present invention is the design in order to realize some plate product (such as some pipeline product made from steel) in process of production The good finish rolling finishing temperature of TMCP and cooling started temperature technological parameter, in other words in order to reach what product had designed The requirement of TMCP technological parameter, the technical scheme to the transformation that the equipment on production line is carried out, specifically, is that cut deal is rolled The technical scheme that speed control system in line automation system is transformed.So for purposes of the invention, finish rolling finishing temperature It is exactly to control two |input parametes needing with cooling started temperature, for the temperature range of general most steel grades, The finish rolling finishing temperature of TMCP technique：950～700 DEG C, the cooling started temperature of TMCP technique：900～750 DEG C.
According to technical scheme of the present invention, F1, F2, F3', the F5' moment is all by existing finishing mill Two-stage control system The hodograph setup algorithm module that the milling train of system C2f sets in mathematical model is calculated according to set arithmetic logic, belongs to In existing control system module.
For example, the F1 moment is the initial time that module functions to, and starts timing from this moment, i.e. the tool in F1 moment The body time=0s, now steel plate be parked on roller-way, this position be otherwise known as throwing steel position, throw steel position to milling train distance quilt Referred to as steel throwing distance.
During F2 moment, steel plate enters milling train, and control system is passed through to monitor the rolling force sensor of milling train, if roll-force passes The real time data of sensor is more than the threshold values (as 6MN) of certain default then it is assumed that steel plate starts steel rolling, and that is, steel plate is in F2 Carve,
Roller-way and milling train acceleration (unit：m/s2), steel throwing distance (unit：M) it is the numerical value that human-machine interaction picture gives, Throw steel position to milling train.
The F3' moment is the moment that steel plate rolling speed reaches maximum Vmx, being calculated as follows of concrete time, the F2 moment Speed=roller-way and the concrete time in milling train acceleration × F2 moment, unit：The concrete time in m/s2, F3' moment=F2 moment Concrete time+(speed in Vmx-F2 moment)/roll table accelerating, unit：Unit m/s2 of s, Vmx.The triggering thing in F5' moment Part is that the real time data of mill milling force transducer is less than the threshold values that system gives then it is assumed that the already out milling train of steel plate, during F5' The concrete time carved=(steel plate length -0.5 × (speed+Vmx in the F2 moment) × (tool in F3' moment of this rolling pass outlet The concrete time in m- F2 moment during body))/Vmx, unit：S, the steel plate length of this rolling pass outlet is by existing finishing mill two Other modules that the milling train of level control system C2f sets in mathematical model are calculated, unit：m.
In the RT2' moment it is simply that the head in this moment steel plate reaches interface point, interface point 2 position is usually located at control Before one or two group of roller-way group of cooling device, specifically for certain producing line, interface point 2 position production line electrically from The concrete roller-way group number before controlling chiller is had determined that, Fig. 8 asked for an interview by schematic diagram during dynamicization system design.
In the A1' moment, i.e. steel plate speed reaches cooling commencing speed Vast, the control input signal of triggering electric machines for roller Switching, motor is taken over by the first class control system C1a controlling chiller, and keeps Vast speed；
In the A2' moment, i.e. steel plate enters and controls the chiller moment, steel plate enters and controls chiller, starts to control cold But process.In the A2' moment, i.e. steel plate enters and controls the chiller moment, due to given rational finishing mill final pass Rolling maximal rate, roller-way transport maximal rate uniform velocity parameter, decrease steel plate and arrive in the finishing mill final pass operation of rolling Steel plate reduction of speed between roller-way transport process, pause, reduce air cooling temperature drop in whole process for the steel plate, the now temperature of steel plate Can reach or the cooling started temperature close to TMCP technological requirement.
Control cooling procedure itself is complex, and it is to the effect that：Ensure the cooling of steel plate each position uniformly, plate shape no On the premise of damage, the austenite phase transformation condition of steel is control effectively, determine cooling started temperature, cold including reasonable But the technological parameter such as speed, cooling termination temperature and cooling path, thus realizing the control to steel phase transition process, obtains required The final microstructure and mechanical property wanted.(defined above copy from《Chinese Medium and Heavy Plate Rolling technology and equipment》9.4.3.4 section cooling system Degree controls).
The cooling technique parameter such as the rate of cooling of steel plate, cooling termination temperature is exactly the target controlling cooling procedure to be reached Require.The concrete means controlling cooling procedure, according to the difference of the device type controlling chiller, have various concrete handss Section, the roller press type direct quenching device of the western mark company of Germany using for Baosteel Heavy Plate Mill's production line is accelerated with U-tube laminar flow The control chiller of chiller combination, U-tube laminar flow collector group number that the specific means that it controls includes opening in advance, total Water supply flow, the steel plate speed of service figure in cooling controller, roller press type direct quenching device the constraint of upper constraint roll The means such as power.Steel plate speed of service figure after cooling starts is the important control device of one of which, and this is by control cooling dress Cooling jig in the second control system C2a putting is calculated, and the present invention runs for the steel plate having begun to after cooling down Figure is not changed, and still maintains original service chart.
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It is characterized in that, the finish rolling finishing temperature of described TMCP technique：950～700 DEG C, the cooling started temperature of described TMCP technique： 900～750 DEG C.
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It is characterized in that,
The realization of the speed of service figure of above-mentioned new whole process, needs one to be used for global coordination calculating speed graph parameter Rate control module C2g, the function of C2g is before last passage of finishing mill starts rolling, according in production ordering The finish rolling finishing temperature of steel plate, the cooling started temperature that require it is desirable to C2a, that is, control in the second control system of chiller Cooling mathematical model calculate speed Vast when the cooling of this steel plate starts, and combine the final chi after the completion of steel plate rolling Very little, calculate maximum mill speed Vmx of suitable final pass, this velocity amplitude be also the transport process of steel plate transport speed Degree, is finally sent to C2f result of calculation (i.e. Vmx), i.e. the second control system of finishing mill, and C1 module, and that is, roller-way group is defeated Speed control unit module during fortune steel plate.
The cut deal control system of modernization is equipped with cooling down mathematical model at present, and details is asked for an interview《Chinese cut deal rolls Technology processed and equipment》, Section 10.5 control cold mathematical model and《Refractory gold ores and Process Control System that slab roller repairing controls Foundation》, Wang Xiaobo etc., world steel, the 6th phase in 2010).
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It is characterized in that,
Control module C2g is provided with and C2f, C2L, C2a, the communication interface of the C1 of each roller-way group, is additionally provided with access and produces The interface of instruction (PDI) relevant information,
After steel plate completes the rolling of passage second from the bottom of finishing mill, that is, before last passage starts rolling, Trigger the running of this control module C2g.
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It is characterized in that,
The internal process of described C2g module running and as follows with the information exchange content of other unit modules：
The second control system C2f of finishing mill, after steel plate rolling completes passage second from the bottom, notifies C2g to start to open Dynamic, C2g module notifies to control the second control system C2a of chiller to start to calculate respectively；
The cooling mathematical model of C2a completes calculating process, and cooling commencing speed Vast in result of calculation is returned to C2g；
C2g starts the calculating of overall operation hodograph after the Vast of C2a receiving；
After C2g completes the calculating of overall operation hodograph, maximal rate Vmx in result of calculation, it is sent to C2f, make For rolling maximal rate, and C2f is required to recalculate the speed of service figure of the operation of rolling；
C2g, maximal rate Vmx in result of calculation, is sent to the motor control unit C1 of each roller-way group, Vmx is as defeated Fortune process maximal rate.
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, 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) accept to cool down, from C2a unit, cooling commencing speed Vast that mathematical model calculates；
6) access production ordering information (PDI) interface, obtain the mill product thickness h of steel plate, the finish rolling end of TMCP technique Roll cooling started temperature Tast of temperature Tfin, TMCP technique；
7) using according to radiant heat transfer computing formula (steel plate of derivation from leave milling train to control chiller required for The computing formula of time, calculates required time △ t and steel plate can be allowed in the operating temperature drop of roller-way, meet TMCP technique The corresponding temperature drop value of parameter (finish rolling finishing temperature Tfin- cools down started temperature Tast),
8) according to the distance transporting required time △ t and producing line arrangement calculating, calculate the machine maximum that final pass rolls Speed Vmx, Vmx is also the maximal rate of roller-way transport process simultaneously.
Described radiant heat transfer computing formula is it is known that temperature drop when strip steel transports mainly radiates the thermal loss causing, steel The computing formula of heat radiation heat transfer in transport process for the plate refers to《The model of hot strip rolling and control》5.2.1 section band Temperature drop during steel transmission, Sun Yikang, metallurgical industry publishing house, 2002).
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It 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 the completion of steel plate rolling,
Tast is the cooling started temperature (unit of TMCP technique：Kelvin K),
Tfin is the finish rolling finishing temperature (unit of TMCP technique：Kelvin K),
ρ is the density (kg/m in high temperature for the steel plate3, 7300～7800kg/m3),
C is the specific heat (J/ (kg K), 600～750J/ (kg K)) in high temperature for the steel plate,
σ is Stefan-Boltzmann constant (σ=5.67 × 10-8W/(m2·K4)), the numerical value of above three parameter and taking Value scope, well known for this skilled person.
ε is the radiance to space radiation for the high-temperature steel plate plane, and numerical value is between 0.6～0.8.
ε can be according to《The model of hot strip rolling and control》The method that 5.2.1 section is introduced, asks after carrying out temperature statistics ?.
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It 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) to roller-way interface point 1 for the finishing mill,
Sa is that roller-way interface point 2 arrives the distance (m, scope 0.8～10m) controlling chiller,
△ t is the result of calculation (s, scope 0.1～30s) of formula (1),
Vast is to cool down, from C2a unit, cooling commencing speed (m/s, the scope that mathematical model calculates：0.3～3.0m/ S),
Coe is correction factor, and scope is 0.9～1.2.
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It is characterized in that,
Finishing mill second control system C2f runs as follows：
The second control system C2f of described finishing mill is receiving rolling of the output parameter from rate control module C2g After machine maximal rate Vmx, make the parameter of original control unit, the maximum Vfmx=Vmx that is, mill speed of steel plate reaches, Then,
The second control system C2f making finishing mill recalculates the mill speed of steel plate and reaches moment of maximum：During F3 ' Carve, make the parameter of original control unit, that is, the mill speed of steel plate reaches the moment F3=F3 ' of maximum.
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It is characterized in that,
The speed control unit C1 of each roller-way group runs as follows：
Described speed control unit C1 is receiving after the output parameter Vmx of C2g, makes the ginseng of original control unit Number Vrt=Vmx, and do not use the preset parameter of each roller-way group control unit original itself preservation；
When the RT2' moment, after steel plate head reaches interface point, steel plate starts reduction of speed, and steel plate speed reaches cooling commencing speed Vast, that is, in the A1' moment, the control input signal switching of triggering electric machines for roller, replace original reduction of speed to zero just triggering switching, Can leave out.
According to a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention, It is characterized in that,
The described speed control unit C1a controlling chiller runs as follows：
When in the A1' moment, after triggering the control input signal switching of electric machines for roller, motor is by the one-level controlling chiller Control system C1a is taken over, and now keeps Vast speed it is not necessary to acceleration or deceleration, until in the A2' moment, steel plate enters and controls Chiller, starts to control cooling procedure, replaces original needs and accelerates to speed Vast from zero.
Technical solution of the present invention is as follows：
It is applied to according to finishing mill, control the modernization cut deal possessing automation control system of chiller arrangement to produce Line, layout drawing is shown in Fig. 1, and needs to have milling train as Fig. 3, roller-way, controls the related control of the speed controlling of chiller Unit.
The steel from the process being rolled down to steel plate startup control cooling starting last passage of technical solution of the present invention Plate speed of service figure, such as Figure 10.
Figure 10 starts, from the steel plate that is rolled down to starting last passage, the steel plate operation controlling the whole process cooling down New hodograph
As shown in Figure 10, Vmx is the mill speed of the maximum in final pass for the steel plate, be also in transport process all at the uniform velocity Degree, F1 moment steel plate starts to move on entering mill approach table, and F2 moment steel plate enters milling train to start to roll, and steel plate continues Accelerate, the mill speed of F3' moment steel plate reaches maximum Vmx, and hereafter speed is maintained at maximum Vmx, until F5' moment steel Plate leaves milling train, completes this passes, and speed remains at Vmx.Leave the 2 to 4th group roller after milling train in steel plate tail When certain in road group organizes roller-way group (this roller-way group is referred to as transport process switching point), for the RT1' moment in diagram, triggering roller The control input signal switching of road motor, motor is controlled by the speed control unit C1 of each roller-way group, and steel plate continues to keep Vmx Transport velocity.When the RT2' moment, after steel plate head reaches interface point, steel plate starts reduction of speed, and in the A1' moment, steel plate speed reaches To cooling commencing speed Vast, the control input signal switching of triggering electric machines for roller, motor is by the one-level control controlling chiller System C1a adapter processed, and keep Vast speed, in the A2' moment, steel plate enters and controls chiller, starts to control cooling procedure.
The realization of the speed of service figure of above-mentioned new whole process, needs to newly increase one for global coordination calculating speed The rate control module C2g of graph parameter, as shown below.The function of C2g is to start to roll it in last passage of finishing mill Before, finish rolling finishing temperature, cooling started temperature according to the steel plate requiring in production ordering are it is desirable to cooling mathematical modulo in C2a Type calculates the speed Vast when cooling of this steel plate starts, and combines the final size after the completion of steel plate rolling, calculates conjunction Maximum mill speed Vmx of suitable final pass, this velocity amplitude is also the transport velocity of the transport process of steel plate, finally calculating Result is sent to C2f and C1 module.Speed controlling correlation function within C2f, C1, C2a is also required to change accordingly, finally real The hodograph that now new steel plate runs.
The Content of communciation of control module C2g newly increasing and other modules and communication moment, it is summarized as follows.C2g and C2f, C2a, the C1 of each roller-way group have communication interface, also access the interface of production ordering (PDI) relevant information.Complete finish rolling in steel plate After the rolling of passage second from the bottom of machine, that is, before last passage starts rolling, trigger the running of this module, this module is transported The internal process made and the information exchange content with other unit modules, see below Figure 12.
The computational methods of the overall operation hodograph in the internal process of control module C2g newly increasing, are summarized as follows.Right The |input paramete answered includes：The mill product thickness h of steel plate, finish rolling finishing temperature Tfin, the TMCP technique of TMCP technique cold But started temperature Tast, cooling commencing speed Vast, output parameter is Vmx, sees Figure 13.
Specifically calculation procedure is：
Accept to cool down, from C2a unit, cooling commencing speed Vast that mathematical model calculates；
Access production ordering information (PDI) interface, obtain the mill product thickness h of steel plate, the finish rolling finish to gauge of TMCP technique Cooling started temperature Tast of temperature Tfin, TMCP technique；
Using the steel plate according to radiant heat transfer formula proving from leave milling train to control chiller required when Between computing formula, the required time △ t calculating can allow steel plate meet TMCP technique in the operating temperature drop of roller-way The corresponding temperature drop value of parameter (finish rolling finishing temperature Tfin- cools down started temperature Tast).The computing formula of △ t is as follows：
Formula (1)
In formula (1), h is the finished product thickness after the completion of steel plate rolling, and Tast is that the cooling started temperature of TMCP technique is (single Position：Kelvin), Tfin be TMCP technique finish rolling finishing temperature (unit：Kelvin).ρ is the density in high temperature for the steel plate, c It is the specific heat in high temperature for the steel plate, σ is Stefan-Boltzmann constant, the numerical value of above three parameter and span, for this Skilled person is well known.ε is the radiance to space radiation for the high-temperature steel plate plane, and numerical value is between 0.6～0.8, permissible According to《The model of hot strip rolling and control》The method that 5.2.1 section is introduced, tries to achieve after carrying out temperature statistics.
The calculating of output parameter milling train maximal rate Vmx, Vmx also serves as the transport velocity of steel plate transport process simultaneously.Meter Calculate formula as follows：
Formula (2)
Sf in formula (2) is the distance to roller-way interface point for the finishing mill, and Sa is roller-way interface point to control chiller Distance, as shown in figure 14.△ t is the result of calculation of formula (1).Vast is to calculate from C2a unit cooling mathematical model Cooling commencing speed.Coe is correction factor, according to onsite application effect, is adjusted, and scope is 0.9～1.2.
Change in finishing mill second control system C2f, is summarized as follows.C2f rolls receiving the output parameter from C2g After machine maximal rate Vmx, make parameter Vfmx=Vmx of original control unit, and do not use original finishing mill control unit certainly The numerical value that body calculates, then makes C2f recalculate the F3 ' moment, makes parameter F3=F3 of original control unit '.Change original control The service chart of the down speeding procedure of unit output processed, changes constant for being always maintained at Vmx speed, leaves new definition by steel plate tail The RT1' moment of transport process switching point, the control input signal switching of triggering electric machines for roller, complete steel plate overall operation speed figure In the operation of rolling.
The change of the speed control unit C1 of each roller-way group, is summarized as follows.C1 is receiving the output parameter from C2g After Vmx, make parameter Vrt=Vmx of original control unit, and do not use each roller-way group control unit original itself to preserve Preset parameter.Change the service chart of the down speeding procedure of original control unit output, when the RT2' moment, steel plate head reaches interface point Afterwards, steel plate starts reduction of speed, and steel plate speed reaches cooling commencing speed Vast, and that is, in the A1' moment, the control of triggering electric machines for roller is defeated Enter signal switching, rather than original reduction of speed, to zero, just triggers switching.
Control the change of the speed control unit C1a of chiller, be summarized as follows.When in A1' moment, triggering electric machines for roller The switching of control input signal after, motor take over by the first class control system C1a controlling chiller, now keeps Vast fast Degree, it is not necessary to acceleration or deceleration, until in the A2' moment, steel plate enters and controls chiller, starts to control cooling procedure.Originally Need to accelerate to speed Vast from zero.
In the implementation of the above-mentioned new hodograph of the present invention, increased new global coordination calculating speed graph parameter Rate control module, will according to the technique of cooling started temperature so that the control unit of three original processes is combined as a whole Ask, calculate reasonable and identical final pass maximum mill speed and steel plate transport velocity, maximally utilised equipment Ability, reduces the reduction of speed running, and reaches the purpose reducing temperature losses of the process.In addition, using operation acceleration as few as possible, reduction of speed mistake The speed of service figure of journey, it is also possible to the excessive danger of the electric machines for roller moment load of minimizing high-speed rotation, also reduces steel plate following table Slide between face and roller-way the surface of steel plate cut causing.
Beneficial effect
According to the technological requirement of cooling started temperature, calculate reasonable and identical final pass maximum mill speed and steel Plate transport velocity, has maximally utilised capacity of equipment, reduces the reduction of speed running, and reaches the purpose reducing temperature losses of the process.Separately Outward, the speed of service figure of acceleration, down speeding procedure is run it is also possible to reduce the electric machines for roller power of high-speed rotation using as few as possible The danger of square load excessive, also reduces the surface of steel plate cut causing that slides between lower surface of steel plate and roller-way.In 5 meters of thickness of Baosteel After adopting this technical scheme in plate producing line, temperature drop during finishing mill is transported to control chiller for the steel plate decreases More than 10 DEG C.Shown in following figure below, employ the finish rolling finishing temperature of steel plate of new solution and cool down started temperature Situation.
Brief description
The arrangement schematic diagram of Fig. 1 existing Medium and Heavy Plate Rolling Production line.
The common finish rolling finishing temperature of Fig. 2 and cooling started temperature schematic diagram.
The control unit schematic diagram of the speed controlling correlation of Fig. 3 milling train, roller-way and control chiller.
The hodograph that the steel plate of Fig. 4 operation of rolling runs.
The control unit schematic diagram of the speed controlling correlation of the milling train of Fig. 5 operation of rolling, roller-way and control chiller.
The control unit schematic diagram of the speed controlling correlation of the milling train of Fig. 6 transport process, roller-way and control chiller.
Fig. 7 controls the hodograph that the steel plate of cooling procedure runs.
Fig. 8 controls the related control unit of the speed controlling of the milling train, roller-way and control chiller of cooling procedure to illustrate Figure.
Fig. 9 starts, from the steel plate that is rolled down to starting last passage, the speed that the steel plate of the whole process controlling cooling runs Degree figure
Figure 10 starts, from the steel plate that is rolled down to starting last passage, the steel plate operation controlling the whole process cooling down New hodograph.
Figure 11 new from milling train to control chiller speed control unit schematic diagram.
The internal process of Figure 12 C2g module and the information exchange 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 employs finish rolling finishing temperature and the cooling started temperature schematic diagram of the steel plate of new solution.
Figure 16 prior art corresponding steel plate speed of service figure.
Figure 17 technical solution of the present invention control output the finishing mill final pass operation of rolling, roller-way transport process whole The new speed service chart that body is coordinated.
Specific embodiment
Embodiment
If cut deal producing line arranges, roller-way group is divided into 6 groups, each roller-way group according to finishing mill, control chiller order Title is FX1, FX2, FX3, FX4, FX5, AC1 respectively, the connected position between FX5 and AC1 be interface point position, interface point away from It is 58 meters from finishing mill Sf, interface point distance controlling chiller entrance is 6.8 meters apart from Sa.Define the phase between FX1 and FX2 Vicinal is set to transport process switching point.
Increase the rate control module C2g for global coordination calculating speed graph parameter newly.Change C2f, C1, C1a, C2a, increase Plus communicate and the original speed controlling function of change with C2g.Weight by above newly-increased and original speed control unit module Structure, the speed service chart of the new one seamless connection of realization, reach the purpose reducing temperature losses of the process.
Taking the steel plate of certain TMCP technique as a example, specifically bright control method.If the TMCP technological parameter of this kind will Ask for：Finish rolling finishing temperature Tfin is 800 DEG C, and cooling started temperature Tast is 780 DEG C.
When 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 Afterwards, trigger the operation of C2g.
C2g notifies to control the cooling mathematical model of the second control system C2a of chiller to carry out cooling procedure ginseng first The calculating of number.
Speed Vast that cooling mathematical model 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；
Access the data base interface of production ordering information (PDI), obtain steel plate finished product thickness h=16.05 × 10-3m (i.e. 16.05mm), finish rolling finishing temperature Tfin=1073K (i.e. 800 DEG C) of TMCP technique, the cooling started temperature of TMCP technique Tast=1053K (i.e. 780 DEG C)；
Calculate and throw steel to controlling chiller to enter the required time △ t of steel from finishing mill, steel plate density p=7500kg/m3, Specific heat c=635J/ (kg K), Stefan-Boltzmann constant σ=5.672 × 10-8Js-1m-2K-4, radiance ε=0.8. According to formula (1),
Obtain △ t=13.2s.；
Calculate output parameter milling train maximal rate Vmx, Vmx also serves as the transport velocity of steel plate transport process simultaneously.By public affairs Formula (2),
Given coe=1.0, Sf=58m, Sa=6.8m, known Vast=1.6m/s, obtains Vmx=6.48m/s.
After the completion of the calculating of C2g overall operation graph parameter Vmx, C2g is sent to C2f Vmx, and C2g sends Vmx and Vast C1 to each roller-way group.
C2f is receiving after output parameter milling train maximal rate Vmx6.48m/s of C2g, makes original control unit Parameter Vfmx=6.48m/s, and do not use original finishing mill control unit itself calculate numerical value, then make C2f again count Calculate the F3 ' moment, make parameter F3=F3 of original control unit '.Change the service chart of the down speeding procedure of original control unit output, Changing as being always maintained at Vmx speed is that 6.48m/s is constant, is left by steel plate tail and transports switching between FX1 and FX2 roller-way group The RT1' moment of point, the control input signal switching of triggering electric machines for roller, switch to and speed controlling is carried out by the C1 of each roller-way group, Complete the operation of rolling of steel plate overall operation speed in figure.
The C1 of FX2, FX3, FX4, FX5, AC1 is receiving after the output parameter Vmx6.48m/s of C2g, makes original Parameter Vrt=6.48m/s of control unit, and do not use the preset parameter of each roller-way group control unit original itself preservation. Change the service chart of the down speeding procedure of original control unit output, when the RT2' moment, steel plate head reaches the friendship between FX5 and AC After contact, steel plate starts reduction of speed, and steel plate speed reaches cooling commencing speed Vast1.6m/s, that is, in the A1' moment, triggering roller-way electricity The control input signal switching of machine, switches to the C1a controlling chiller to carry out speed controlling.
When in the A1' moment, after triggering the control input signal switching of electric machines for roller, motor is by the one-level controlling chiller Control system C1a is taken over, now keep speed be Vast1.6m/s it is not necessary to acceleration or deceleration, until steel plate enter control cold But device, starts to control cooling procedure.
A kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for the steel plate of the present invention is applied to 5 meters of producing lines of Heavy Plate of Baosteel, through practice principle, respond well, during steel plate is transported to control chiller from finishing mill Temperature drop decreases more than 10 DEG C.The technology of the present invention adaptation is wide and easy to use, and equipment investment is few, has automatically Change on the heavy and medium plate mill production line that the order according to finishing mill, control chiller controlling is arranged, this technology is fully able to Promote the use of, there is wide Technique Popularizing prospect.

Claims (11)

1. a kind of control method of temperature drop in Medium and Heavy Plate Rolling Production line process for steel plate, is mainly used in Medium and Heavy Plate Rolling The steel plate rolling of production line and the control method of transporting velocity, described Medium and Heavy Plate Rolling Production line order includes：Finishing mill is Passage milling train afterwards, 1～N group rollgang after milling train, control chiller and thermal straightening machine, described steel plate rolling and transporting velocity Control method be a total tune speed automatic control method, transport including the finishing mill final pass operation of rolling, roller-way The speed controlling of the total tune of process it is characterised in that
N：5～9,
In the expectation started temperature of known steel plate course of conveying, i.e. the finish rolling finishing temperature of TMCP technique, expectation end temp, that is, After the cooling started temperature of TMCP technique, steel plate overall operation hodograph is considered, reduce overall process light plate Reduction of speed, pause, make the rolling maximal rate of finishing mill final pass identical with the numerical value that roller-way transports maximal rate, and it is suitable to obtain RPM schedule,
Setting Vmx is the maximum mill speed in finishing mill final pass for the steel plate, is also the even speed in transport process,
In the F1 moment, that is, in the entrance finishing mill final pass milling train moment, steel plate starts to move on roller-way steel plate,
In the F2 moment, that is, steel plate enters finishing mill final pass milling train and starts to roll the moment, and steel plate continues to accelerate,
In the F3' moment, that is, the mill speed of steel plate reaches the maximum Vmx moment, and hereafter speed is maintained at maximum Vmx,
Until the F5' moment, that is, steel plate leaves milling train, completes this passes, speed remains at Vmx,
In the RT1' moment, that is, steel plate tail leave in milling train the 2 to 4th group roller-way group below certain organize roller-way group, this roller-way group Also referred to as transport process switching point, the control input signal switching of triggering 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 continues to keep the transport velocity of Vmx；
In the RT2' moment, steel plate head reaches interface point, and the definition of interface point is for controlling the 1st group or the 2nd before chiller The position that group roller-way group is located, then, steel plate starts reduction of speed；
In the A1' moment, steel plate speed reaches cooling commencing speed Vast, the control input signal switching of triggering electric machines for roller, electricity Machine is taken over by the first class control system C1a controlling chiller, and keeps Vast speed；
In the A2 ' moment, i.e. steel plate enters and controls the chiller moment, now the temperature of steel plate reaches or will close to TMCP technique The cooling started temperature asked.
2. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 1, It is characterized in that, the finish rolling finishing temperature of described TMCP technique：950～700 DEG C, the cooling started temperature of described TMCP technique： 900～750 DEG C.
3. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 1, It is characterized in that,
Above-mentioned speed automatic control method, needs a rate control module C2g being used for global coordination calculating speed graph parameter, The function of rate control module C2g is before last passage of finishing mill starts rolling, according to require in production ordering The finish rolling finishing temperature of steel plate, cooling started temperature it is desirable to C2a, that is, control the cooling in the second control system of chiller Mathematical model calculates the speed Vast when cooling of this steel plate starts, and combines the final size after the completion of steel plate rolling, meter Calculate 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, that is, Vmx is sent to C2f, i.e. the second control system of finishing mill, and C1 module, when that is, roller-way group transports steel plate Speed control unit module.
4. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 1, It is characterized in that,
Rate control module C2g is provided with and C2f, C2L, C2a, the communication interface of the C1 of each roller-way group, is additionally provided with access and produces Instruction, i.e. the interface of PDI relevant information,
After steel plate completes the rolling of passage second from the bottom of finishing mill, that is, before last passage starts rolling, triggering This rate control module C2g operates.
5. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 3, It is characterized in that,
The internal process of described rate control module C2g running and as follows with the information exchange content of other unit modules：
The second control system C2f of finishing mill, after steel plate rolling completes passage second from the bottom, notifies rate control module C2g Start to start, rate control module C2g notifies to control the second control system C2a of chiller to start to calculate respectively；
The cooling mathematical model of C2a completes calculating process, and cooling commencing speed Vast in result of calculation is returned to speed Control module C2g；
Rate control module C2g starts the calculating of overall operation hodograph after the Vast of C2a receiving；
After rate control module C2g completes the calculating of overall operation hodograph, maximal rate Vmx in result of calculation, send To C2f, as rolling maximal rate, and C2f is required to recalculate the speed of service figure of the operation of rolling；
Rate control module C2g, maximal rate Vmx in result of calculation, is sent to the motor control unit C1 of each roller-way group, Vmx is as transport process maximal rate.
6. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 3, It is characterized in that,
The concrete calculation procedure of the overall operation hodograph in the internal process of described rate control module C2g is：
1) accept to cool down, from C2a unit, cooling commencing speed Vast that mathematical model calculates；
2) access production ordering information, i.e. PDI interface, obtain the mill product thickness h of steel plate, the finish rolling finish to gauge temperature of TMCP technique Cooling started temperature Tast of degree Tfin, TMCP technique；
3) using according to the steel plate of radiant heat transfer formula proving from leaving milling train to the required time controlling chiller Computing formula, calculate required time △ t and steel plate can be allowed in the operating temperature drop of roller-way, meet TMCP technological parameter Corresponding temperature drop value, i.e. finish rolling finishing temperature Tfin- cooling started temperature Tast；
4) according to the distance transporting required time △ t and producing line arrangement calculating, calculate the machine maximal rate that final pass rolls Vmx, Vmx are also the maximal rate of roller-way transport process simultaneously.
7. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 6, It is characterized in that,
The computing formula of △ t is as follows：
In formula (1),
H is the finished product thickness after the completion of steel plate rolling, unit：M,
Tast is the cooling started temperature of TMCP technique, unit：Kelvin K,
Tfin is the finish rolling finishing temperature of TMCP technique, unit：Kelvin K,
ρ is the density in high temperature for the steel plate, unit：kg/m3, 7300～7800kg/m3,
C is the specific heat in high temperature for the steel plate, unit：J/ (kg K), 600～750J/ (kg K),
σ is Stefan-Boltzmann constant, σ=5.67 × 10-8W/(m2·K4),
ε is the radiance to space radiation for the high-temperature steel plate plane, and numerical value is between 0.6～0.8.
8. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 1, It is characterized in that,
The computing formula of output parameter milling train maximal rate Vmx is as follows：
In formula (2),
Sf is the distance to roller-way interface point 1 for the finishing mill, unit：M, scope 5～20m,
Sa is that roller-way interface point 2 arrives the distance controlling chiller, unit：M, scope 0.8～10m,
△ t is the result of calculation of formula (1), unit：S, scope 0.1～30s,
Vast is to cool down the cooling commencing speed that mathematical model calculates, unit from C2a unit：M/s, scope：0.3～3.0m/ S,
Coe is correction factor, and scope is 0.9～1.2.
9. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 1, It is characterized in that,
Finishing mill second control system C2f runs as follows：
The second control system C2f of described finishing mill the output parameter receiving from rate control module C2g milling train After big speed Vmx, make the parameter of original control unit, the maximum Vfmx=Vmx that is, mill speed of steel plate reaches, so Afterwards,
The second control system C2f making finishing mill recalculates the mill speed of steel plate and reaches moment of maximum：F3 ' the moment, Make the parameter of original control unit, that is, the mill speed of steel plate reaches the moment F3=F3 ' of maximum.
10. the control method of temperature drop in Medium and Heavy Plate Rolling Production line process for a kind of steel plate as claimed in claim 1, It is characterized in that,
The speed control unit C1 of each roller-way group runs as follows：
Described speed control unit C1 is receiving after the output parameter Vmx of C2g, makes the parameter of original control unit Vrt=Vmx,
When the RT2' moment, after steel plate head reaches interface point, steel plate starts reduction of speed, and steel plate speed reaches cooling commencing speed Vast, that is, in the A1' moment, the control input signal switching of triggering electric machines for roller.
A kind of controlling party of 11. temperature drops in Medium and Heavy Plate Rolling Production line process for steel plate as claimed in claim 1 Method it is characterised in that
The described speed control unit C1a controlling chiller runs as follows：
When in the A1' moment, after triggering the control input signal switching of electric machines for roller, motor is controlled by the one-level controlling chiller System C1a is taken over, and now keeps Vast speed it is not necessary to acceleration or deceleration, until in the A2' moment, steel plate enters and controls cooling Device.
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