CN104540617B - Solidification end position control method and solidification end position control device - Google Patents
Solidification end position control method and solidification end position control device Download PDFInfo
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- CN104540617B CN104540617B CN201380042003.5A CN201380042003A CN104540617B CN 104540617 B CN104540617 B CN 104540617B CN 201380042003 A CN201380042003 A CN 201380042003A CN 104540617 B CN104540617 B CN 104540617B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
Abstract
nullTemperature computation portion (101) infers the surface temperature of strand by the conduction model employing the operating condition of continuous casting machine，The parameter correction portion (102) pyroconductivity to comprising in conduction model、Heat transfer coefficient between mould and solidified shell、And at least one parameter in the heat transfer coefficient of cooling twice band is corrected，So that the measured value of the surface temperature of strand is consistent with the inferred value of the surface temperature of strand，Solidification end position control portion (103) utilizes the conduction model of the parameter after employing correction to infer the solidification end position of strand temperature and strand，The operational ton of secondary cooling water is calculated according to the deviation with the solidification end position desired value predetermined，Utilize the conduction model employing parameter，Infer strand temperature and solidification end position，Described parameter is the parameter that the parameter to the function as the secondary cooling water after correction has substituted into the secondary cooling water obtained plus the operational ton calculated，In the case of constraints in the operation of satisfied regulation，Cooling twice is controlled based on the operational ton calculated.
Description
Technical field
The present invention relates to the temperature of the strand (cast strand) in continuous casting machine is inferred,
Control to solidify the solidification end position control method (Final of the curdled appearance of the strands such as end position
Solidification point control method) and solidification end position control device.
Background technology
In the operation of continuous casting machine, the curdled appearance of the strand in grasp casting continuously is the heaviest
Want.Such as, due to the cooling (two of the cooling spray (cooling spray) after extracting mould
Secondary cooling, secondary cooling) insufficient, so the state general solidified the most completely with inside
Strand extract continuous casting machine outer in the case of, molten steel outflow when having cut off strand within and
Cause bigger trouble.Therefore, in order to suppress to be pulled out by strand when inside solidifies the most completely
Going out the situation outside continuous casting machine, the curdled appearance grasping strand exactly is critically important.
It addition, at steel when casting continuously, strand solidification latter stage non-solidifying phase under, due to
The volume of molten steel shrinks because of solidification, so the molten steel after composition concentrates remains in as final solidification
Between the dendrite in portion and flow, produce the so-called center segregation being collected at strand central part and solidify
(centerline segregation), the quality variation of steel products.Such as, if in oil transportation
With the line pipe material of, natural gas conveying produces center segregation, then due to the work of sour gas
With hydrogen induced cracking (HIC) (HIC, the hydrogen induced that can produce with center segregation as starting point
cracking).It addition, in the deep drawing material that the canned products of drinking water is used, due to
The segregation of the composition caused because of center segregation causes occurring anisotropy in processability.
Known have a kind of center segregation in order to prevent from causing steel products quality to deteriorate and in solidification
The drafts that latter stage matches with the solidification shrinkage amount with strand is to not solidifying what strand was depressed lentamente
Method (hereinafter referred to as slighter compress (soft reduction)).According to slighter compress, to receive with solidification
The drafts that contracting amount matches pressure slow to strand makes the volume of non-solidifying phase reduce, and will not cause
Concentrating the flowing of molten steel and preventing center segregation between dendrite (dendritic structure).In view of
This, need suitably to carry out cooling twice, controls be equipped with reality by the solidification end position of strand
Execute in the range of the slighter compress band (soft reduction zone) of the roll stacks of slighter compress.
Further, the quality trouble such as rupture in order to suppress to produce casting billet surface, need with will be from mould
The correction unit bent towards stretched strand below vertical direction to horizontal direction immediately below tool
In (bending and straightening zones), the temperature of strand is not delivered to brittle district
The mode of (brittle temperature range) sets the constraints of cooling twice
(constraint conditions)。
According to such background, it is desirable to the surface temperature of a kind of strand measured in continuously casting and
Internal temperature, grasps the curdled appearance of the strand of the temperature of correction unit, solidification end position etc. and fits
The technology that locality is controlled.But, the surface temperature of the strand in casting is being watered two continuously
The position of secondary cooling water becomes the lowest compared with internal temperature, waits not between multiple cooled regions
Watered the position backheat of secondary cooling water.Additionally, due to the also existence of secondary cooling water, water steaming
The generation of gas, so being difficult to the surface temperature of the strand for the purpose of suitably controlling cooling twice
Measurement.Further, since the ambient temperature of continuous casting machine is the harshest, so do not have
Having can the technology of internal temperature of on-line measurement strand.Therefore, up to now, also root is being carried out
According to employing the numerical computations of conduction model to infer that the curdled appearance of strand is (with reference to patent documentation
1)。
Specifically, the technology described in patent documentation 1 first whenever progress specific length cast,
The calculating face vertical with pouring into a mould direction is produced in assuming that the strand in casting continuously
(calculation plane).It follows that this technology is in the face of calculating respectively by cast direction, edge even
Continue the multiple regions set and arrive the moment on next approaching side border, region, based on the most just
The average cooling condition in the region passed through calculates the Temperature Distribution in calculating face.And, this technology
Temperature Distribution in obtained calculating face is given the calculating for carrying out after next region
Initial value, by calculating the Temperature Distribution in calculating face successively, obtain final area approaching side
Temperature Distribution in the calculating face on border and infer curdled appearance.
Patent documentation 1: Japanese Unexamined Patent Publication 2002-178117 publication
Patent documentation 2: Japanese Unexamined Patent Publication 9-24449 publication
Patent documentation 3: Japanese Unexamined Patent Publication 10-291060 publication
In the case of the curdled appearance being inferred strand by numerical computations, by strand is carried out
Nailing (the nail shooting method) etc. confirms the curdled appearance of reality, and based on really
Recognize result to adjust the parameter of conduction model, thus the concordance with actual curdled appearance is carried out
Compensate.And, once carry out the adjustment of the parameter of conduction model, carry out phase the most in this condition
The operation of letter result of calculation.But, in the case of casting condition, steel grade difference, cool down
The works different from the moment of the adjustment carrying out parameter such as the change of equipment or aging, temporary fault
In the case of industry state, the inferred results of the curdled appearance by calculating becomes different from reality
Result, it is impossible to infer the curdled appearance of strand accurately.
Additionally, in order to solve such problem points, propose have patent documentation 2, patent documentation 3 institute
The technology recorded.Specifically, the technology described in patent documentation 2 is according to based on cooling spray
Flow instruction and what the temperature of strand obtained by the result that casts and usage control calculated
The parameter of Controlling model is modified by the difference of the temperature of strand, and the flow of this cooling spray refers to
Order is to use the Controlling model after the physical phenomenon of continuous casting machine being formulated to set.Patent
Technology described in document 3 is corrected the heat flux distribution from casting billet surface so that strand
The value of calculation of the surface temperature at measuring point is consistent with measured value.
According to the technology described in patent documentation 2,3, by the parameter of model is modified energy
Enough make the measured value of strand temperature consistent with value of calculation at measuring point.But, due to about strand
The value of calculation of internal temperature does not makes it consistent with actual internal temperature, so even with revising
After model there is no to infer in high precision the guarantee of curdled appearance yet.Therefore, it is possible to strand
Solidification end position departs from continuous casting machine and causes bigger trouble.Furthermore, it is possible to bring strong
The temperature transfer of the strand in positive portion produces the quality trouble of cracking to brittle district at casting billet surface.
It addition, do not record the control carrying out that the solidification end position of strand is modified to initial target location
The technology of system.
Summary of the invention
The present invention completes in view of above-mentioned technical problem, its object is to, it is provided that high accuracy pushes away
Disconnected strand temperature (internal temperature of strand and surface temperature) and the solidification shape of strand can be controlled
Solidification end position control method and the solidification end position of state control device.
In order to solve above-mentioned technical problem, realize purpose, the solidification end position control that the present invention relates to
Method processed is that the solidification that the solidification end position to the strand in continuous casting machine is controlled terminates
Position control method, it is characterised in that comprise: the casting direction in continuous casting machine is at least
A little measure the temperature measuring step of the surface temperature of strand；By employing the work of continuous casting machine
The conduction model of industry condition infers the strand at the measurement site in said temperature determination step
The temperature of surface temperature infers step；To the pyroconductivity comprised in above-mentioned conduction model, mould with
Heat transfer coefficient between solidified shell and at least one in the heat transfer coefficient of cooling twice band
Parameter be corrected so that strand in said temperature determination step surface temperature measured value with
Said temperature infers the aligning step that the inferred value of the surface temperature of the strand in step is consistent；According to
Employ the conduction model of the parameter after being corrected by above-mentioned aligning step, infer and comprise strand
The strand temperature of surface temperature and internal temperature, and internal temperature based on the strand inferred pushes away
The solidification end position of the solidification end position of the strand in disconnected continuous casting machine infers step；According to
Infer that the solidification end position inferred value that step is obtained is prerequisite with pre-by above-mentioned solidification end position
The deviation of fixed solidification end position desired value calculates the operation of the operational ton of secondary cooling water
Amount calculation procedure；According to employing the conduction model of parameter, infer the strand in continuous casting machine
Temperature, and internal temperature based on the strand inferred infers the solidifying of strand in continuous casting machine
Gu the curdled appearance of end position infers step, wherein, described parameter is to as by above-mentioned school
The parameter of the function of the secondary cooling water after positive step correction has substituted into plus passing through aforesaid operations
The amount operational ton that calculates of calculation procedure and the parameter of secondary cooling water that obtains；Judge by upper
State the strand temperature regulation the most satisfied with solidification end position that curdled appearance infers that step is inferred
Operation on the determination step of constraints；And when meet in above-mentioned determination step above-mentioned about
During bundle condition, control secondary based on the operational ton calculated in aforesaid operations amount calculation procedure cold
But operating procedure.
Moreover, it relates to solidification end position control method be characterised by, at above-mentioned
In bright, when being unsatisfactory for above-mentioned constraints in above-mentioned determination step, repeatedly perform aforesaid operations
Amount calculation procedure, curdled appearance infer step and determination step until meeting this constraints and being
Only.
Moreover, it relates to solidification end position control method be characterised by, at above-mentioned
In bright, the constraints in above-mentioned determination step is allowed band and the rectification of solidification end position
The temperature range in portion.
Moreover, it relates to solidification end position control device be to the casting in continuous casting machine
The solidification end position that the solidification end position of base is controlled controls device, it is characterised in that tool
Standby: temperature measurement unit, the extremely a little less mensuration strand of the casting direction in continuous casting machine
Surface temperature；Temperature infers unit, utilizes the heat conduction mould of the operating condition employing continuous casting machine
The surface temperature of the strand at the measurement site of said temperature determination unit inferred by type；Correction is single
Unit, to the heat transfer system between the pyroconductivity comprised in above-mentioned conduction model, mould and solidified shell
At least one parameter in the heat transfer coefficient of number and cooling twice band is corrected, so that on
State temperature measurement unit with said temperature, the measured value of the surface temperature of strand is inferred that unit is to casting
The inferred value of the surface temperature of base is consistent；Solidification end position infers unit, utilizes to employ and passes through
The conduction model of parameter after the correction of above-mentioned correction unit, infer the surface temperature comprising strand and
The strand temperature of internal temperature, and internal temperature based on the strand inferred infers continuously casting
The solidification end position of the strand in machine；Operational ton computing unit, terminates according to by above-mentioned solidification
What location estimating unit was obtained solidifies end position inferred value and the solidification end position predetermined
The deviation of desired value calculates the operational ton of secondary cooling water；Curdled appearance infers unit, utilizes
Employ the conduction model of parameter, infer the strand temperature in continuous casting machine, and based on deduction
The internal temperature of the strand gone out to infer the solidification end position of the strand in continuous casting machine, its
In, described parameter is to the function as the secondary cooling water after being corrected by above-mentioned correction unit
Parameter substituted into by the operational ton calculated by aforesaid operations amount computing unit plus and obtain
The parameter of secondary cooling water；Identifying unit, it is determined that infer that unit pushes away by above-mentioned curdled appearance
Whether the strand temperature of breaking and solidification end position meet the constraints in the operation of regulation；With
And operating unit, in the case of being judged to meet above-mentioned constraints by above-mentioned identifying unit,
Cooling twice is controlled based on the operational ton calculated by aforesaid operations amount computing unit.
Control according to the solidification end position control method that the present invention relates to and solidification end position
Device, it is possible to infer strand temperature accurately, control the curdled appearance of strand.
Accompanying drawing explanation
Fig. 1 is to represent to apply the solidification end position as an embodiment of the invention to control
The schematic diagram of the structure of the continuous casting machine of device.
Fig. 2 is that the solidification end position being denoted as an embodiment of the invention controls device
The block diagram of structure.
Fig. 3 is to be denoted as the flow process that the curdled appearance control of an embodiment of the invention processes
Flow chart.
Fig. 4 be the surface temperature representing the strand at the equipping position of surface thermometer measured value with
And the figure of the change of the inferred value of the surface temperature of the strand before and after the correction of parameter.
Fig. 5 is the variations in temperature of the thickness direction central part of the strand before and after the correction of illustration parameter
Figure.
Fig. 6 is the temperature of the thickness direction central part of the strand before and after the operation of illustration secondary cooling water
The figure of degree change.
Fig. 7 is the variations in temperature of the surface temperature of the strand before and after the operation of illustration secondary cooling water
Figure.
Fig. 8 is the figure of the variations in temperature of the surface temperature illustrating the strand before and after constraints is reached.
Fig. 9 is the variations in temperature of the thickness direction central part illustrating the strand before and after constraints is reached
Figure.
Detailed description of the invention
Hereinafter, referring to the drawings, to the solidification end position control as an embodiment of the invention
Structure and its action of device processed illustrate.
(structure of continuous casting machine)
First, with reference to Fig. 1, terminate the solidification as an embodiment of the invention can be applied
The structure of the continuous casting machine of position control illustrates.
Fig. 1 is to represent to apply the solidification end position as an embodiment of the invention to control
The schematic diagram of the structure of the continuous casting machine of device.As it is shown in figure 1, can apply as the present invention
An embodiment solidification end position control device continuous casting machine 1 in, at full steel
It is provided with mould 4 below the vertical direction of the tundish 3 of liquid 2, arranges in the bottom of tundish 3
Have and become the dip pipe 5 supplying mouth to the molten steel of mould 4.Set below the vertical direction of mould 4
It is equipped with support wheel 6.
It is configured with multiple cooled region 7a～13a, 7b～13b conduct in the cast direction of strand S
Cooling twice band.It is configured with multiple spraying at each cooled region to use or the nozzle of air-atomizing,
Spray secondary cooling water to the surface of strand S from each nozzle.Wherein, in FIG, to datum level phase
The cooled region figure of (the opposite side of the base plane) (upper face side) of tossing about is shown with
Symbol a, is shown with symbol to the cooled region figure of datum level side (the base plane) (following side)
Number b.It addition, in this configuration example, cooled region is 7 altogether, but the continuous casting of reality
The number of the cooled region in machine is different according to mechanical length etc..
Near the approaching side of final cooled region 13a, 13b, it is equipped with mensuration strand S
The surface thermometer 14 of surface temperature.In the present embodiment, although at final cooled region
The vicinity of the approaching side of 13a, 13b has arranged surface thermometer 14 but it also may in more upstream side
Cooled region between arrange surface thermometer 14.
(structure of solidification end position control device)
It follows that with reference to Fig. 2, to the solidification end position as an embodiment of the invention
The structure controlling device illustrates.
Fig. 2 is that the solidification end position being denoted as an embodiment of the invention controls device
The block diagram of structure.As in figure 2 it is shown, as the solidification end position of an embodiment of the invention
Control device 100 to be made up of the information processor such as work station, personal computer.Solidification stop bits
Put control device 100 and perform control by arithmetic processing apparatus such as the CPU within information processor
Processing procedure sequence, is used as temperature computation portion 101, parameter correction portion 102 and solidification end position
Control portion 103 plays a role.For the function in these each portions by aftermentioned.It addition, solidification stop bits
Put control device 100 and surface thermometer 14 and the output device such as display device, printing equipment
110 connect.
(curdled appearance control process)
It is shown below by performing that the solidification end position having a structure in which controls device 100
Curdled appearance control processes, and reaches the constraints in the operation such as temperature range of correction unit right
The solidification end position of strand S is modified.Hereinafter, with reference to the flow chart shown in Fig. 3, to holding
Solidification end position when this curdled appearance control of row processes controls the action of device 100 and says
Bright.
Fig. 3 is to be denoted as the flow process that the curdled appearance control of an embodiment of the invention processes
Flow chart.Flow chart shown in Fig. 3 operates at continuous casting machine, such as strand S has passed through table
In the moment of the equipping position of surface thermometer 14, curdled appearance control process enters step S1
Process.
In the process of step S1, temperature computation portion 101 measures the arranging position of surface thermometer 14
Put the surface temperature of the strand S at place.Thus, the process of step S1 terminates, and curdled appearance controls
Process enters the process of step S2.
In the process of step S2, temperature computation portion 101 is calculated (with use by cooling twice
The heat conduction that the cooling twice of the strand of conduction model is relevant), carry out gauging surface thermometer 14
Equipping position at the inferred value of surface temperature of strand S.Specifically, it is considered in cast side
To being sliced the strand section for unit length, give water-cooled, wind according to the place in strand S
The type of thermal communication of the boundary condition of the casting billet surface under the various situations such as cold, water smoke cooling, roll heat radiation
Amount (with reference to formula (2)) solves the two-dimentional heat conduction side represented by formula (1) shown below
Formula, thus perform the cooling twice in continuous casting machine and calculate.Wherein, for cooling twice meter
Calculate itself, owing to being known when the application of the present invention, so omitting detailed description.
It addition, in heat conduction in mould 4, by hmIt is set to solidified shell and mould inner wall
Heat transfer coefficient, the surface temperature of the solidified shell that T is set in mould, by TmIt is set in mould
Wall temperature, is changed to formula (3) shown below by the boundary condition of formula (2).Wherein,
C in formula (1) is the specific heat of strand S, and ρ is the density of strand S, and k is strand S
Pyroconductivity, T is the surface temperature of strand S, and x, y are the thickness direction representing strand S respectively
And the coordinate figure of the position of width.It addition, the Q in formula (2) represents heat flux,
H represents the heat transfer coefficient of cooling twice band, and T represents the surface temperature of strand S, TaRepresent ring
Border temperature.In the process of step S2, use given in advance as initial parameter h,
hm, k calculate the inferred value of surface temperature of strand S.Thus, the process of step S2 terminates,
Curdled appearance control process enters the process of step S3.
[formula 1]
[formula 2]
Q=h (T-Ta)…(2)
[formula 3]
Q=hm(T-Tm)…(3)
In the process of step S3, the conduction of heat that formula (1) is comprised by parameter correction portion 102
Heat transfer coefficient h between mould inner wall and solidified shell that rate k, formula (3) are comprisedm, with
And at least one parameter in the heat transfer coefficient h of cooling twice band that comprised of formula (2)
Value is corrected, so that the inferred value of the surface temperature obtained by the process of step S2 and survey
Definite value is consistent.
In the present embodiment, as the parameter of conduction model, the heat transfer system to cooling twice band
Number h is corrected, but to the heat transfer system between pyroconductivity k, mould inner wall and solidified shell
Number hmFollowing process can be applied too in the case of being corrected.Wherein, after correction
Heat transfer coefficient h ' in cooling twice band can use correction coefficient alpha as following formula (4)
Represent.
[formula 4]
H '=α h ... (4)
By the value of parameter is corrected, casting manipulations bar general when from Initial parameter sets
Part (cooling condition in the molten steel temperature that such as, carries out pouring into a mould, mould, the composition of casting piece,
The setting etc. of the secondary cooling water in size, casting temperature, casting speed, continuous casting machine),
The situation that steel grade has been changed；There is the change of cooling device, aging or temporary fault
Situation is inferior, it is also possible to carry out the high-precision cooling twice meter corresponding with the change of job state
Calculate.Thus, the process of step S3 terminates, and curdled appearance control process enters the process of step S4.
In the process of step S4, solidification end position control portion 103 uses by step S3
Process the conduction model after parameter has been carried out correction, calculate internal temperature and the table of strand S
The inferred value of surface temperature (strand temperature), the thickness direction central authorities of the strand S by will conclude that
The temperature in portion compares with solidus temperature, infers the solidification end position of strand S.
Specifically, by supposing that the strand being sliced as unit length in cast direction cuts open continuously
Face, and carry out cooling twice calculating at each strand section, it is possible to calculate the long side direction of strand S
The variations in temperature in (cast direction).Even if that is, casting speed, cooling water inflow change in casting
In the case of, obtain water-cooled real achievement data, casting speed, T/D molten steel temperature by online
The operating conditions such as degree also carry out cooling twice calculating in real time, it is also possible to calculate the long limit of strand S
The variations in temperature in direction.The temperature of the thickness direction central part of each strand section by calculating
Compare with solidus temperature, it is possible to infer solidification end position and the shape of strand S.By
This, the process of step S4 terminates, and curdled appearance control process enters the process of step S5.
In the process of step S5, solidification end position control portion 103 is based on by step S4
The inferred position of the solidification end position of the strand S processed and infer and solidification set in advance
The deviation of the target location of end position, the secondary calculating strand S in the way of eliminating deviation is cold
But the operational ton of the water yield.When calculating the operational ton of secondary cooling water, solidification end position controls
Portion 103 should to the inferred position of solidification end position and the deviation of the target location of solidification end position
By the known method such as scale operation, proportional integral computing.Thus, the process of step S5 terminates,
Curdled appearance control process enters the process of step S6.
Wherein, the heat transfer coefficient h of cooling twice band is as follows as the function of secondary cooling water w
Formula (5) represents like that.
[formula 5]
H=h (w) ... (5)
Here, the correction coefficient alpha of above-mentioned formula (4) is obtained for heat transfer coefficient h (w)
Coefficient, even if being applied to the heat transfer system after secondary cooling water w imparts operational ton Δ w
(w+ Δ w) does not has the problem in precision to number h yet.That is, the heat transfer coefficient h (w before correction
(relation of w+ Δ w) is according to above-mentioned formula (4) for heat transfer coefficient h ' after+Δ w) and correction
And formula (5) is expressed as following formula (6).Therefore, though operation secondary cooling water, without
The heat transfer coefficient h ' of the cooling twice band after processing correction by step S3 is carried out again
Correction.In the case of operating secondary cooling water, as long as h ' (w) to be changed to h ' (w
+ Δ w).
[formula 6]
H ' (w+ Δ w)=α h (w+ Δ w) ... (6)
In the process of step S6, solidification end position control portion 103 uses and employs parameter h '
(conduction model of w+ Δ w) calculates strand temperature (internal temperature and the table of strand S
Surface temperature) inferred value, infer solidification end position, wherein, described parameter h ' (w+ Δ w)
It is to parameter h after processing correction by step S3 ' substitute into plus by the place of step S5
The operational ton Δ w that calculates of reason and the secondary cooling water (parameter of w+ Δ w) that obtains.By
This, the process of step S6 terminates, and curdled appearance control process enters the process of step S7.
In the process of step S7, solidification end position control portion 103 judges by step S6
Whether the inferred value of the strand temperature processed and calculate meets the constraints in operation.Here,
It is (crisp that solidification end position control portion 103 confirms that the strand temperature in correction unit does not passes to brittle district
Change temperature range) and solidification end position inferred position be in the allowed band with regulation
Target location as the constraints in operation.
In the case of solidification end position control portion 103 is judged to be unsatisfactory for these constraintss,
Curdled appearance control is processed the process returning to step S5.That is, solidification end position control portion
103 until reaching constraints and repeatedly performing to change the operational ton of secondary cooling water, deduction
The process of strand temperature.On the other hand, it is judged to meet in solidification end position control portion 103
In the case of above-mentioned constraints, curdled appearance control process is made to enter the process of step S8.
In the process of step S8, solidification end position control portion 103 controls initial cooling
Water yield w is plus the operational ton Δ w gained of the cooling water inflow calculated by the process of step S5
The cooling water inflow (cooling twice of w+ Δ w).Thus, solidification end position control portion 103
Carry out being modified to solidification end position the control of target location.Thus, the process knot of step S8
Bundle, a series of curdled appearance control has processed.
From the above description, control in the curdled appearance as an embodiment of the invention
In process, infer strand temperature and solidification end position accurately, it is possible to meet and correction unit
In surface temperature relevant constraints, and make solidification end position become the scope of regulation
The mode of target location is controlled.Therefore, if in the way of solidification end position becomes machinery end
It is controlled, then the capacity of equipment of continuous casting machine can be made to perform to maximum to maintain the height of product
Productivity ratio.If it addition, being controlled, then in the way of making solidification end position become slighter compress band
It is prevented from the variation of the inner part matter such as center segregation and generates the product of high-quality.
(embodiment)
Fig. 4 be represent the surface temperature at the equipping position of surface thermometer 14 measured value and
The inferred value of the surface temperature of the casting position (distance of distance mould 4) before and after the correction of parameter
The figure of change.In the present embodiment, to the heat transfer coefficient h in the cooling twice band in parameter
Corrected.In the diagram, line L1 represents that casting position goes out with the parametric inference before correction
Surface temperature between relation, line L2 represent casting position with correction after parametric inference go out
Surface temperature between relation.It addition, the equipping position of some surface thermometer 14 shown in P1
The measured value of the surface temperature at (casting position=25m) place is 808 DEG C.This position with school
The surface temperature that parametric inference before just goes out is 836 DEG C as shown in a P2.In consideration of it, make
Heat transfer coefficient h in cooling twice band increases by the correction of 5%, makes the surface temperature shown in line L2
Degree inferred value surface thermometer 14 equipping position (casting position=25m) with some P1 mono-
Cause.
Fig. 5 is the figure of the variations in temperature representing the thickness direction central part before and after the correction of parameter.?
In Fig. 5, line L3 represents casting position and the thickness direction central authorities gone out with the parametric inference before correction
Relation between the temperature in portion, line L4 represents that casting position goes out with the parametric inference after correction
Relation between the temperature of thickness direction central part.Wherein, due to the solid phase of steel grade of the present embodiment
Line temperature is 1500 DEG C, so by the casting position that temperature is 1500 DEG C of thickness direction central part
It is inferred as solidifying end position.That is, as Fig. 5 used shown in some P3, push away with the parameter before correction
The solidification end position that breaks is casting position=29.7m, with coagulating that the parametric inference after correction goes out
Gu end position show casting position=29.1m as put P4.
It follows that with reference to Fig. 6～Fig. 9, illustrate the step of the operational ton determining secondary cooling water.
Wherein, in the present embodiment, based on the deviation with the target location of the solidification end position being pushed off
Obtain the amount of change of the heat dissipation capacity of cooling twice.The amount of change of heat dissipation capacity can be according to cooling twice
Relation between the change of the operational ton of water and the inferred position of solidification end position is obtained.
Fig. 6 is the variations in temperature representing the thickness direction central part before and after the operation of secondary cooling water
Figure.In figure 6, the thickness that line L4 infers under representing casting position and state before operation
Relation between the temperature of degree direction central part, line L5 represents casting position and shape after the activation
Relation between the temperature of the thickness direction central part inferred under state.Wherein, line L4 and Fig. 5
Line L4 identical.
Fig. 7 is the figure of the variations in temperature representing the surface temperature before and after the operation of secondary cooling water.
In the figure 7, the surface temperature that line L2 infers under representing casting position and state before operation
Between relation, line L6 represents the surface temperature inferred under casting position and state after the activation
Relation between degree.Wherein, the line L2 of line L2 with Fig. 4 is identical.
Fig. 8 is the figure of the variations in temperature representing the surface temperature before and after the reaching of constraints.At figure
In 8, the line L2 of line L2 with Fig. 7 is identical, represents casting position and the behaviour at secondary cooling water
Relation between the surface temperature inferred under state before work.Line L6 represent casting position with
The surface temperature inferred before constraints is reached under state after the operation of secondary cooling water
Between relation, identical with the line L6 of Fig. 7.Line L7 represents casting position and at cooling twice
Relation between the surface temperature inferred after constraints is reached under state after the operation of water.
Fig. 9 be represent constraints reach before and after the figure of variations in temperature of thickness direction central part.
In fig .9, the line L4 of line L4 with Fig. 6 is identical, represents casting position and at secondary cooling water
Relation between the surface temperature inferred under the preoperative state of amount.The line of line L5 Yu Fig. 6
L5 is identical, represents that casting position is retraining bar with after the operation of secondary cooling water
The relation of the surface temperature that part is inferred before reaching.Line L8 represents casting position and at cooling twice
The relation of the surface temperature inferred after constraints is reached under the state after the operation of the water yield.
Owing to the desired value of the solidification end position of the steel grade of the present embodiment is 28.3m (allowed band
For casting position=28.3～28.5m), so as shown in Figure 6, make heat dissipation capacity increase from current value
Add 7.5%, in order to the solidification end position being pushed off is changed to a P5 (to mould 4 from a P4
Side 0.8m).Now, as shown in the line L6 of Fig. 7, by the rectification that the bending of strand S is recovered
Portion R1 (casting position=15～20m) passes to brittle district (surface temperature≤700 DEG C).In view of
This, be not transferred to this constraints of brittle district to meet the surface temperature in correction unit R1,
Increments making the current value of the heat dissipation capacity from cooling twice is changed to 5%.In the case of Gai,
As shown in the line L7 of Fig. 8, the surface temperature of strand S will not be passed to embrittlement by correction unit R1
District, meets constraints.It addition, solidification end position is as shown in the some P8 of Fig. 9, it is pushed off
For casting position=28.5m, the allowed band meeting the target location making solidification end position becomes
The constraints of casting position=28.3m～28.5m.To sum up it has been confirmed that by will be from secondary
The increments that the current value of heat dissipation capacity of cooling rises is changed to 5%, it is possible to meet constraints and
Solidification end position is controlled in target location (allowed band).
Above, the embodiment applying the invention completed by present inventor is illustrated, but
The present invention not by the description of the part constituting disclosure of the invention of the present embodiment with
And accompanying drawing limits.Namely be based on other realities that present embodiment is completed by those skilled in the art etc.
Execute mode, embodiment and application technology etc. and be integrally incorporated in scope of the invention.
Industrial utilizability
In sum, the solidification end position control method that the present invention relates to and solidification end position
Control the device temperature be applicable to the strand inferred continuous casting machine, control to solidify end position
Technology Deng the curdled appearance of strand.
Symbol description
1 ... continuous casting machine；2 ... molten steel；3 ... tundish；4 ... mould；5 ... dip pipe；6…
Support wheel；7a～13a, 7b～13b ... cooled region；14 ... surface thermometer；100 ... solidification
End position controls device；101 ... temperature computation portion；102 ... parameter correction portion；103 ... solidification
End position control portion；110 ... output device；S ... strand.
Claims (4)
1. a solidification end position control method, is the solidification to the strand in continuous casting machine
The solidification end position control method that end position is controlled, it is characterised in that including:
Temperature measuring step, the extremely a little less mensuration strand of the casting direction in continuous casting machine
Surface temperature；
Temperature infers step, is pushed away by the conduction model employing the operating condition of continuous casting machine
The surface temperature of the strand at measurement site in disconnected described temperature measuring step；
Revise step, between the pyroconductivity comprised in described conduction model, mould and solidified shell
Heat transfer coefficient and cooling twice band heat transfer coefficient at least one parameter repair
Just, so that the measured value of the surface temperature of strand in described temperature measuring step pushes away with described temperature
The inferred value of the surface temperature of the strand in disconnected step is consistent；
Solidification end position infers step, utilizes and employs by the described revised ginseng of correction step
The conduction model of number, infers the strand temperature of the surface temperature comprising strand and internal temperature, and
Internal temperature based on the strand inferred infers that the solidification of the strand in continuous casting machine terminates
Position；
Operational ton calculation procedure, infers, according to by described solidification end position, the solidification that step is obtained
End position inferred value and the deviation solidifying end position desired value predetermined are to calculate secondary
The operational ton of cooling water inflow；
Curdled appearance infers step, utilizes the conduction model employing parameter, infers casting continuously
Strand temperature in machine, and in internal temperature based on the strand inferred infers continuous casting machine
The solidification end position of strand, described parameter is to as revised by described correction step
The parameter of the function of secondary cooling water has substituted into and has calculated plus in described operational ton calculation procedure
The operational ton that goes out and the parameter of secondary cooling water obtained；
Determination step, it is determined that the strand temperature inferred by described curdled appearance deduction step is with solidifying
Gu whether end position meets the constraints in the operation of regulation；And
Operating procedure, when meeting described constraints in described determination step, based on passing through
State operational ton that operational ton calculation procedure calculates to control cooling twice.
Solidification end position control method the most according to claim 1, it is characterised in that
When being unsatisfactory for described constraints in described determination step, repeatedly perform described operational ton
Calculation procedure, curdled appearance infer step and determination step until meeting this constraints.
3., according to the solidification end position control method described in claims 1 or 2, its feature exists
In,
Constraints in described determination step is allowed band and the rectification of solidification end position
The temperature range in portion.
4. solidification end position controls a device, is the solidification to the strand in continuous casting machine
The solidification end position that end position is controlled controls device, it is characterised in that possess:
Temperature measurement unit, the extremely a little less mensuration strand of the casting direction in continuous casting machine
Surface temperature；
Temperature infers unit, is pushed away by the conduction model employing the operating condition of continuous casting machine
The surface temperature of the strand at the measurement site of disconnected described temperature measurement unit；
Amending unit, between the pyroconductivity comprised in described conduction model, mould and solidified shell
Heat transfer coefficient and cooling twice band heat transfer coefficient at least one parameter repair
Just, so that the measured value of the surface temperature of strand is inferred by described temperature measurement unit with described temperature
Unit is consistent to the inferred value of the surface temperature of strand；
Solidification end position infers unit, utilizes and employs by the revised ginseng of described amending unit
The conduction model of number, infers the strand temperature of the surface temperature comprising strand and internal temperature, and
Internal temperature based on the strand inferred infers that the solidification of the strand in continuous casting machine terminates
Position；
Operational ton computing unit, infers, according to by described solidification end position, the solidification that unit is obtained
End position inferred value and the deviation solidifying end position desired value predetermined are to calculate secondary
The operational ton of cooling water inflow；
Curdled appearance infers unit, utilizes the conduction model employing parameter, infers casting continuously
Strand temperature in machine, and in internal temperature based on the strand inferred infers continuous casting machine
The solidification end position of strand, wherein, described parameter is to repair as by described amending unit
The parameter of the function of the secondary cooling water after just has substituted into plus being calculated by described operational ton single
Operational ton that unit calculates and the function of secondary cooling water that obtains；
Identifying unit, it is determined that infer the strand temperature inferred of unit and solidifying by described curdled appearance
Gu whether end position meets the constraints in the operation of regulation；And
Operating unit, is being judged to meet the situation of described constraints by described identifying unit
Under, control cooling twice based on the operational ton calculated by described operational ton computing unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-179703 | 2012-08-14 | ||
| JP2012179703 | 2012-08-14 | ||
| PCT/JP2013/069693 WO2014027543A1 (en) | 2012-08-14 | 2013-07-19 | Method for controlling solidification completion position and device for controlling solidification completion position |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104540617A CN104540617A (en) | 2015-04-22 |
| CN104540617B true CN104540617B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380042003.5A Active CN104540617B (en) | 2012-08-14 | 2013-07-19 | Solidification end position control method and solidification end position control device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5585739B2 (en) |
| KR (1) | KR101709623B1 (en) |
| CN (1) | CN104540617B (en) |
| IN (1) | IN2015DN01066A (en) |
| WO (1) | WO2014027543A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105195702A (en) * | 2015-09-30 | 2015-12-30 | 芜湖新兴铸管有限责任公司 | Continuous casting water cooling adjustment technological structure |
| DE102018215583A1 (en) * | 2018-09-13 | 2020-03-19 | Sms Group Gmbh | Process for controlling or regulating the temperature of a casting strand in a continuous casting installation |
| CN109500371A (en) * | 2018-12-20 | 2019-03-22 | 南京钢铁股份有限公司 | A kind of slab dynamic secondary cooling and slighter compress control system |
| KR102606935B1 (en) * | 2019-10-03 | 2023-11-29 | 제이에프이 스틸 가부시키가이샤 | In-mold solidified shell thickness estimation apparatus, in-mold solidified shell thickness estimation method, and continuous steel casting method |
| CN110802208B (en) * | 2019-11-13 | 2021-06-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for adjusting water yield of continuous casting production in high-latitude area |
| CN114905020B (en) * | 2022-05-16 | 2022-12-27 | 北京科技大学 | Method for correcting solidification heat transfer model in continuous casting process |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054257A (en) * | 1983-08-31 | 1985-03-28 | Sumitomo Heavy Ind Ltd | Method for controlling position of solidification completion point in continuous casting |
| JPH01210158A (en) * | 1988-02-16 | 1989-08-23 | Nippon Steel Corp | Method for controlling cooling of cast slab in continuous casting |
| JPH0654257A (en) * | 1992-07-31 | 1994-02-25 | Hitachi Medical Corp | Digital subtraction angiography device |
| JPH0924449A (en) | 1995-07-14 | 1997-01-28 | Hitachi Ltd | Method for controlling cooling in continuous casting machine and device therefor |
| JPH10291060A (en) * | 1997-04-19 | 1998-11-04 | Ebisu:Kk | Continuous casting system |
| JP4474772B2 (en) | 2000-12-20 | 2010-06-09 | Ｊｆｅスチール株式会社 | Continuous casting method |
| WO2005051569A1 (en) * | 2003-11-27 | 2005-06-09 | Jfe Steel Corporation | Method for detecting solidification completion position of continuous casting cast piece, detector, and method for producing continuous casting cast piece |
| CN101890488A (en) * | 2009-05-21 | 2010-11-24 | 宝山钢铁股份有限公司 | Method for determining position of solidified tail end of liquid core of continuous casting billet |
| CN102110188B (en) * | 2009-12-25 | 2012-12-19 | 鞍钢股份有限公司 | Method for calculating continuous casting flow temperature and solid phase rate distribution |
| CN102500747B (en) * | 2011-11-15 | 2014-04-02 | 田志恒 | Online detection system for solid-phase internal boundaries and solidification end positions of continuous casting blanks and method |
-
2013
- 2013-07-19 KR KR1020157003686A patent/KR101709623B1/en active IP Right Grant
- 2013-07-19 CN CN201380042003.5A patent/CN104540617B/en active Active
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| Publication number | Publication date |
|---|---|
| JP5585739B2 (en) | 2014-09-10 |
| KR20150033724A (en) | 2015-04-01 |
| IN2015DN01066A (en) | 2015-06-26 |
| WO2014027543A1 (en) | 2014-02-20 |
| KR101709623B1 (en) | 2017-02-23 |
| CN104540617A (en) | 2015-04-22 |
| JPWO2014027543A1 (en) | 2016-07-25 |
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