CN104540617A - Method for controlling solidification completion position and device for controlling solidification completion position - Google Patents
Method for controlling solidification completion position and device for controlling solidification completion position Download PDFInfo
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- CN104540617A CN104540617A CN201380042003.5A CN201380042003A CN104540617A CN 104540617 A CN104540617 A CN 104540617A CN 201380042003 A CN201380042003 A CN 201380042003A CN 104540617 A CN104540617 A CN 104540617A
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- end position
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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
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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
Abstract
A temperature calculation unit (101) estimates the surface temperature of a slab by a heat transfer model using the operating conditions of a continuous casting machine. A parameter correction unit (102) corrects at least one parameter, included in the heat transfer model, from among thermal conductivity, a heat transfer coefficient between a mold and a solidifying shell, and a heat transfer coefficient of a secondary cooling zone, so that the measured value of the surface temperature of the slab and the estimated value of the surface temperature of the slab match each other. A solidification completion position control unit (103) performs the following: estimates the slab temperature and the solidification completion position of the slab by a heat transfer model using the corrected parameter; calculates an operation amount of a secondary cooling water amount from the deviation from a previously established solidification completion position target value; estimates the slab temperature and solidification completion position by a heat transfer model using a parameter obtained by plugging in a secondary cooling water amount obtained by adding the calculated operation amount to the corrected parameter which is a function of the secondary cooling water amount; and controls the secondary cooling on the basis of the calculated operation amount if a predetermined operating constraint condition is satisfied.
Description
Technical field
The present invention relates to and the temperature of the strand (cast strand) in continuous casting machine is inferred, carry out solidifying end position control method (Finalsolidification point control method) and solidifying end position control device of the curdled appearance of the strands such as control solidi fication end position.
Background technology
In the operation of continuous casting machine, the curdled appearance grasping the strand in continuous casting is very important.Such as, at the cooling (cooling twice due to the cooling spray (cooling spray) after extracting mould, secondary cooling) insufficient, so when strand is extracted outside continuous casting machine by the state of not solidifying completely with inside, when having cut off strand, the molten steel of inside flows out and causes larger trouble.Therefore, in order to suppress the situation of being extracted by strand under the state of not solidifying completely in inside outside continuous casting machine, the curdled appearance grasping strand is exactly very important.
In addition, when the continuous casting of steel, under the non-solidifying phase of solidifying latter stage of strand, because the volume of molten steel shrinks because solidifying, so composition concentrate after molten steel remain in as flowing between the dendrite finally solidifying portion, the so-called center segregation (centerline segregation) that generation is collected at strand central part and solidifies, the quality variation of steel products.Such as, if produce center segregation in the line pipe material of oil transportation by, natural gas transport, be then the hydrogen induced cracking (HIC) (HIC, hydrogen inducedcracking) of starting point because the effect of sour gas can produce with center segregation.In addition, in the deep drawing material that the canned products of drinking water uses, the segregation due to the composition caused because of center segregation causes occurring anisotropy in processability.
There will be a known a kind of in order to prevent from causing the center segregation of steel products quality deterioration and solidify latter stage with the drafts matched with the solidification shrinkage amount of strand to the method (hereinafter referred to as slighter compress (soft reduction)) of not solidifying strand and depressing lentamente.According to slighter compress, with the drafts matched with solidification shrinkage amount strand slowly depressed and the volume of non-solidifying phase is reduced, the flowing of the concentrated molten steel between dendrite (dendritic structure) can not be caused and prevent center segregation.Given this, need suitably to carry out cooling twice, the end position that solidifies of strand is controlled in the scope of the slighter compress band (soft reduction zone) being equipped with the roll stacks implementing slighter compress.
And, in order to suppress the quality trouble such as to break producing casting billet surface, need with by the correction unit (bending and straightening zones) bending from strand vertically stretched below direction immediately below mould to horizontal direction, the mode that the temperature of strand is not delivered to brittle district (brittle temperature range) sets the constraints (constraint conditions) of cooling twice.
According to such background, require a kind of surface temperature and internal temperature of the strand measured in continuous casting, the technology that the temperature grasping correction unit, the curdled appearance suitably carrying out of strand of solidifying end position etc. control.But the surface temperature of the strand in continuous casting becomes very low in the position of being watered secondary cooling water compared with internal temperature, wait between multiple cooled region and do not watered the position backheat of secondary cooling water.In addition, owing to also having the existence of secondary cooling water, the generation of steam, so be difficult to the measurement of the surface temperature realized suitably to control the strand for the purpose of cooling twice.In addition, because the environment temperature of continuous casting machine is at high temperature very harsh, so do not have can the technology of internal temperature of on-line measurement strand.Therefore, up to now, also the curdled appearance (with reference to patent document 1) inferring strand according to the numerical computations employing conduction model is being carried out.
Specifically, the technology described in patent document 1, first whenever the cast of progress specific length, is all supposed to produce the calculating face (calculation plane) vertical with cast direction in the strand in continuous casting.Next, this technology is when calculating face arrives next approaching side border, region respectively by the multiple region set continuously along cast direction, and the average cooling condition based on the region just passed through before calculates the Temperature Distribution in calculating face.And, Temperature Distribution in obtained calculating face is given the initial value for the calculating carried out after next region by this technology, by calculating the Temperature Distribution in calculating face successively, obtaining the Temperature Distribution in the calculating face on final area approaching side border and inferring curdled appearance.
Patent document 1: Japanese Unexamined Patent Publication 2002-178117 publication
Patent document 2: Japanese Unexamined Patent Publication 9-24449 publication
Patent document 3: Japanese Unexamined Patent Publication 10-291060 publication
When being inferred the curdled appearance of strand by numerical computations, actual curdled appearance is confirmed by carrying out nailing (the nail shooting method) etc. to strand, and based on confirming that result adjusts the parameter of conduction model, thus the uniformity of the curdled appearance with reality is compensated.And, once carry out the adjustment of the parameter of conduction model, then carry out the operation believing result of calculation in this condition.But, when casting condition, steel grade are different, when there is the job state different from the moment of the adjustment carrying out parameter such as the change of cooling device or aging, temporary fault, become the result different from reality by the inferred results of the curdled appearance calculated, the curdled appearance of strand can not be inferred accurately.
In addition, in order to solve such problem points, propose have patent document 2, technology described in patent document 3.Specifically, the parameter of difference to Controlling model of the temperature of the strand that the temperature of the strand that the result that the technology described in patent document 2 is cast according to the flow instruction based on cooling spray obtains and usage control calculate is revised, and the flow instruction of this cooling spray uses the Controlling model after the physical phenomenon formulism of continuous casting machine to set.Technology described in patent document 3 corrects the heat flux distribution from casting billet surface to make the calculated value of the surface temperature at the measuring point place of strand consistent with measured value.
According to the technology described in patent document 2,3, the measured value of strand temperature can be made consistent with calculated value at measuring point by carrying out the parameter of model revising.But the calculated value due to the internal temperature about strand does not make it consistent with actual internal temperature, even if so employ that revised model do not have yet can the guarantee of high accuracy deduction curdled appearance.Therefore, likely the end position that solidifies of strand departs from continuous casting machine and causes larger trouble.In addition, the temperature of the strand in correction unit is likely brought to be delivered to brittle district and to produce the quality trouble ftractureed at casting billet surface.In addition, record and carry out strand to solidify the technology that end position is modified to the control of initial target location.
Summary of the invention
The present invention completes in view of above-mentioned technical problem, its object is to, provide high accuracy infer strand temperature (internal temperature of strand and surface temperature) and solidifying end position control method and solidifying end position control device of the curdled appearance of strand can be controlled.
In order to solve the problems of the technologies described above, realize object, the present invention relates to solidify end position control method be to the strand in continuous casting machine solidify that end position controls solidify end position control method, it is characterized in that, comprise: the temperature measuring step more at least measuring the surface temperature of strand of the casting direction in continuous casting machine; Inferred that by the conduction model of the operating condition employing continuous casting machine the temperature of the surface temperature of the strand at the measurement site place in said temperature determination step infers step; Correct to make the measured value of the surface temperature of the strand in said temperature determination step and said temperature infer the aligning step that the inferred value of the surface temperature of the strand in step is consistent at least one parameter in the heat transfer coefficient of the pyroconductivity comprised in above-mentioned conduction model, heat transfer coefficient between mould with solidified shell and cooling twice band; According to the conduction model employing the parameter after being corrected by above-mentioned aligning step, infer the strand temperature of surface temperature and the internal temperature comprising strand, and the end position that solidifies solidifying end position of the strand of inferring in continuous casting machine based on the internal temperature of the strand of inferring infers step; According to by above-mentioned solidify that end position infers that step obtains solidify the operational ton calculation procedure that end position inferred value and the deviation of solidifying end position desired value that predetermines calculate the operational ton of secondary cooling water; According to the conduction model employing parameter, infer the strand temperature in continuous casting machine, and the curdled appearance of solidifying end position of the strand of inferring in continuous casting machine based on the internal temperature of the strand of inferring infers step, wherein, described parameter is the parameter parameter as the function by the secondary cooling water after above-mentioned aligning step correction having been substituted into the operational ton adding and calculated by aforesaid operations amount calculation procedure and the secondary cooling water obtained; Judge to infer by above-mentioned curdled appearance the strand temperature that step is inferred and solidify the determination step whether end position meets the constraints in the operation of regulation; And when meeting above-mentioned constraints in above-mentioned determination step, control the operating procedure of cooling twice based on the operational ton calculated in aforesaid operations amount calculation procedure.
In addition, the feature of solidifying end position control method that the present invention relates to is, in the present invention as stated above, when not meeting above-mentioned constraints in above-mentioned determination step, repeatedly perform aforesaid operations amount calculation procedure, curdled appearance deduction step and determination step until meet this constraints.
In addition, the feature of solidifying end position control method that the present invention relates to is, in the present invention as stated above, the constraints in above-mentioned determination step solidifies the allowed band of end position and the temperature range of correction unit.
In addition, the present invention relates to solidify end position control device be to the strand in continuous casting machine solidify that end position controls solidify end position control device, it is characterized in that, possess: temperature measurement unit, the surface temperature more at least measuring strand of the casting direction in continuous casting machine; Temperature infers unit, utilizes the conduction model employing the operating condition of continuous casting machine to infer the surface temperature of the strand at the measurement site place of said temperature determination unit; Correcting unit, at least one parameter in the heat transfer coefficient of the pyroconductivity comprised in above-mentioned conduction model, heat transfer coefficient between mould and solidified shell and cooling twice band is corrected, to make said temperature determination unit, the measured value of the surface temperature of strand and said temperature is inferred that the inferred value of unit to the surface temperature of strand is consistent; Solidify end position and infer unit, utilize the conduction model employing the parameter after being corrected by above-mentioned correcting unit, infer the strand temperature of surface temperature and the internal temperature comprising strand, and infer strand in continuous casting machine based on the internal temperature of the strand of inferring solidify end position; Operational ton computing unit, according to by above-mentioned solidify that end position infers that unit obtains solidify the operational ton that end position inferred value and the deviation of solidifying end position desired value that predetermines calculate secondary cooling water; Curdled appearance infers unit, utilize the conduction model employing parameter, infer the strand temperature in continuous casting machine, and infer strand in continuous casting machine based on the internal temperature of the strand of inferring solidify end position, wherein, described parameter has substituted into the parameter of the function as the secondary cooling water after being corrected by above-mentioned correcting unit to be added by the operational ton calculated by aforesaid operations amount computing unit and the parameter of secondary cooling water that obtains; Identifying unit, judges to infer by above-mentioned curdled appearance the strand temperature that unit is inferred and solidify the constraints in the operation of the whether satisfied regulation of end position; And operating unit, when being judged to meet above-mentioned constraints by above-mentioned identifying unit, control cooling twice based on the operational ton calculated by aforesaid operations amount computing unit.
Solidify end position control method according to what the present invention relates to and solidify end position control device, strand temperature can be inferred accurately, controlling the curdled appearance of strand.
Accompanying drawing explanation
Fig. 1 represents the schematic diagram solidifying the structure of the continuous casting machine of end position apparatus for predicting can applied as an embodiment of the invention.
Fig. 2 represents the block diagram solidifying the structure of end position apparatus for predicting as an embodiment of the invention.
Fig. 3 is the flow chart of the flow process of the curdled appearance control treatment represented as an embodiment of the invention.
Fig. 4 is the figure of the change of the inferred value of the surface temperature of strand before and after the measured value of surface temperature of the strand at the equipping position place of presentation surface thermometer and the correction of parameter.
Fig. 5 be illustrate parameter correction before and after the figure of variations in temperature of thickness direction central portion of strand.
Fig. 6 be illustrate secondary cooling water operation before and after the figure of variations in temperature of thickness direction central portion of strand.
Fig. 7 be illustrate secondary cooling water operation before and after the figure of variations in temperature of surface temperature of strand.
Fig. 8 illustrates the figure that constraints reaches the variations in temperature of the surface temperature of the strand of front and back.
Fig. 9 illustrates the figure that constraints reaches the variations in temperature of the thickness direction central portion of the strand of front and back.
Detailed description of the invention
Below, with reference to accompanying drawing, be described as the structure of solidifying end position control device of an embodiment of the invention and its action.
(structure of continuous casting machine)
First, with reference to Fig. 1, the structure of solidifying the continuous casting machine of end position control device can applied as an embodiment of the invention is described.
Fig. 1 represents the schematic diagram solidifying the structure of the continuous casting machine of end position control device can applied as an embodiment of the invention.As shown in Figure 1, can apply in the continuous casting machine 1 solidifying end position control device as an embodiment of the invention, below the vertical direction of tundish 3 being full of molten steel 2, be provided with mould 4, be provided with the dip pipe 5 of the molten steel supply port become to mould 4 in the bottom of tundish 3.Bearing wheel 6 is provided with below the vertical direction of mould 4.
Multiple cooled region 7a ~ 13a, 7b ~ 13b is configured with as cooling twice band in the cast direction of strand S.The nozzle of multiple spraying use or air-atomizing is configured with, from each nozzle to the surface of strand S spray secondary cooling water at each cooled region.Wherein, in FIG, symbol a is shown with to the cooled region figure of datum level opposition side (the opposite side of the base plane) (top side), symbol b is shown with to the cooled region figure of datum level side (the base plane) (following side).In addition, in this configuration example, cooled region is 7 altogether, but the number of cooled region in the continuous casting machine of reality is different according to mechanical length etc.
Near the approaching side of final cooled region 13a, 13b, be equipped with the land surface pyrometer 14 of the surface temperature measuring strand S.In the present embodiment, although arranged land surface pyrometer 14 near the approaching side of final cooled region 13a, 13b, also land surface pyrometer 14 can be arranged between the cooled region of more upstream side.
(solidifying the structure of end position control device)
Next, with reference to Fig. 2, the structure of solidifying end position apparatus for predicting as an embodiment of the invention is described.
Fig. 2 represents the block diagram solidifying the structure of end position control device as an embodiment of the invention.As shown in Figure 2, the end position control device 100 that solidifies as an embodiment of the invention is made up of the information processor such as work station, personal computer.Solidify end position control device 100 by arithmetic processing apparatus executive control programs such as the CPU of information processor inside, be used as temperature computation portion 101, parameter correction portion 102 and solidify end position control part 103 playing a role.For the function in these each portions by aftermentioned.In addition, solidify end position control device 100 to be connected with land surface pyrometer 14 and the output device such as display unit, printing equipment 110.
(curdled appearance control treatment)
What have such structure solidifies end position control device 100 by performing curdled appearance control treatment shown below, reaches constraints in the operations such as the temperature range of correction unit and solidifies end position correction to strand S.Below, with reference to the flow chart shown in Fig. 3, the action of solidifying end position control device 100 when performing this curdled appearance control treatment is described.
Fig. 3 is the flow chart of the flow process of the curdled appearance control treatment represented as an embodiment of the invention.Flow chart shown in Fig. 3 is in the moment that continuous casting machine operates, such as strand S have passed the equipping position of land surface pyrometer 14, and curdled appearance control treatment enters the process of step S1.
In the process of step S1, the surface temperature of the strand S at the equipping position place of temperature computation portion 101 chart surface thermometer 14.Thus, the process of step S1 terminates, and curdled appearance control treatment enters the process of step S2.
In the process of step S2, temperature computation portion 101 calculates (heat conduction relevant to the cooling twice of the strand employing conduction model) by cooling twice, carrys out the inferred value of the surface temperature of the strand S at the equipping position place of gauging surface thermometer 14.Specifically, consider in cast direction by the strand section of cutting into slices as unit length, the heat flux (with reference to formula (2)) giving the boundary condition of the casting billet surface under the various situations such as water-cooled, air-cooled, water smoke cooling, roll heat radiation according to the place in strand S solves the two-dimentional heat conduction equation formula represented by formula (1) shown below, thus the cooling twice performed in continuous casting machine calculates.Wherein, cooling twice is calculated itself, owing to being known when application of the present invention, so omit detailed description.
In addition, in the heat conduction in mould 4, by h
mbe set to the heat transfer coefficient of solidified shell and mould inner wall, T be set to the surface temperature of the solidified shell in mould, by T
mbe set to mould inner wall temperature, the boundary condition of formula (2) is changed to formula (3) shown below.Wherein, the c in formula (1) is the specific heat of strand S, and ρ is the density of strand S, and k is the pyroconductivity of strand S, and T is the surface temperature of strand S, and x, y are the coordinate value representing the thickness direction of strand S and the position of width respectively.In addition, the Q in formula (2) represents heat flux, and h represents the heat transfer coefficient of cooling twice band, and T represents the surface temperature of strand S, T
arepresent environment temperature.In the process of step S2, be used as initial parameter and by h, h of giving in advance
m, k calculates the inferred value of the surface temperature of strand S.Thus, the process of step S2 terminates, and curdled appearance control treatment enters the process of step S3.
[formula 1]
[formula 2]
Q＝h(T-T
a)…(2)
[formula 3]
Q＝h
m(T-T
m)…(3)
In the process of step S3, the heat transfer coefficient h between the mould inner wall that the pyroconductivity k that 102 pairs, parameter correction portion formula (1) comprises, formula (3) comprise and solidified shell
m, and the heat transfer coefficient h of cooling twice band that comprises of formula (2) in the value of at least one parameter correct, to make the inferred value of the surface temperature obtained by the process of step S2 consistent with measured value.
In the present embodiment, as the parameter of conduction model, the heat transfer coefficient h of cooling twice band is corrected, but to pyroconductivity k, heat transfer coefficient h between mould inner wall and solidified shell
mfollowing process can be applied too when carrying out correcting.Wherein, the heat transfer coefficient h ' in the cooling twice band after correction can use correction coefficient alpha to represent like that as shown in the formula (4).
[formula 4]
h’＝αh…(4)
By correcting the value of parameter, in situation about being changed from casting manipulations condition general during Initial parameter sets (setting etc. of the secondary cooling water in the cooling condition in the molten steel temperature such as, carrying out pouring into a mould, mould, the composition of casting piece, size, casting temperature, casting speed, continuous casting machine), steel grade; There is the change of cooling device, situation that is aging or temporary fault is inferior, also can carry out the high-precision cooling twice corresponding with the change of job state and calculate.Thus, the process of step S3 terminates, and curdled appearance control treatment enters the process of step S4.
In the process of step S4, solidify end position control part 103 to use and carried out the conduction model after correcting by the process of step S3 to parameter, calculate the internal temperature of strand S and the inferred value of surface temperature (strand temperature), compared by the temperature of the thickness direction central portion by the strand of inferring S and solidus temperature, that infers strand S solidifies end position.
Specifically, by supposing in cast direction by the strand section of cutting into slices as unit length continuously, and carrying out cooling twice calculating at each strand section, the variations in temperature of the long side direction (cast direction) of strand S can be calculated.Namely, even if in casting when casting speed, cooling water inflow change, by obtaining the operating conditions such as water-cooled real achievement data, casting speed, T/D molten steel temperature online and carrying out cooling twice calculating in real time, the variations in temperature of the long side direction of strand S also can be calculated.Compared by the temperature of the thickness direction central portion by each strand section calculated and solidus temperature, that can infer strand S solidifies end position and shape.Thus, the process of step S4 terminates, and curdled appearance control treatment enters the process of step S5.
In the process of step S5, solidify the inferred position of solidifying end position of the strand S that end position control part 103 is inferred based on the process by step S4, with the deviation of solidifying the target location of end position that presets, calculate the operational ton of the secondary cooling water of strand S in the mode eliminating deviation.When calculating the operational ton of secondary cooling water, solidify end position control part 103 to the inferred position of solidifying end position and the known method such as the computing of deviation application percentage, proportional integral computing of target location of solidifying end position.Thus, the process of step S5 terminates, and curdled appearance control treatment enters the process of step S6.
Wherein, the heat transfer coefficient h of cooling twice band represents as shown in the formula (5) like that as the function of secondary cooling water w.
[formula 5]
h＝h(w)…(5)
Here, the correction coefficient alpha of above-mentioned formula (4) is the coefficient obtained for heat transfer coefficient h (w), even if but be applied to the problem that the heat transfer coefficient h after imparting operational ton Δ w to secondary cooling water w (w+ Δ w) do not have in precision yet.That is, the relation of the heat transfer coefficient h (w+ Δ w) before correction and the heat transfer coefficient h ' (w+ Δ w) after correcting is expressed as following formula (6) according to above-mentioned formula (4) and formula (5).Therefore, even if operation secondary cooling water, also without the need to again correcting the heat transfer coefficient h ' by the cooling twice band after the process correction of step S3.When operating secondary cooling water, as long as h ' (w) to be changed to h ' (w+ Δ w).
[formula 6]
h’(w+Δw)＝αh(w+Δw)…(6)
In the process of step S6, solidify end position control part 103 and adopt the conduction model employing parameter h ' (w+ Δ w), calculate the inferred value of the strand temperature (internal temperature and surface temperature) of strand S, infer and solidify end position, wherein, described parameter h ' (w+ Δ w) has substituted into by the parameter h ' after the process correction of step S3 the parameter adding the operational ton Δ w calculated by the process of step S5 and the secondary cooling water (w+ Δ w) obtained.Thus, the process of step S6 terminates, and curdled appearance control treatment enters the process of step S7.
In the process of step S7, whether the inferred value solidifying the strand temperature that end position control part 103 judges to be calculated by the process of step S6 meets the constraints in operation.Here, solidify the inferred position that strand temperature that end position control part 103 confirms in correction unit do not pass to brittle district (brittle temperature range) and solidify end position and be in the target location of the allowed band with regulation as the constraints in operation.
When solidifying end position control part 103 and being judged to not meet these constraintss, curdled appearance control treatment is turned back to the process of step S5.That is, end position control part 103 is solidified until reach constraints repeatedly perform the operational ton changing secondary cooling water, the process of inferring strand temperature.On the other hand, when solidifying end position control part 103 and being judged to meet above-mentioned constraints, curdled appearance control treatment is made to enter the process of step S8.
In the process of step S8, solidify the cooling twice that end position control part 103 controls the cooling water inflow (w+ Δ w) initial cooling water inflow w being added to the operational ton Δ w gained of the cooling water inflow calculated by the process of step S5.Thus, solidify end position control part 103 to carry out solidifying end position and be modified to the control of target location.Thus, the process of step S8 terminates, and a series of curdled appearance control treatment completes.
From the above description, as in the curdled appearance control treatment of an embodiment of the invention, infer strand temperature accurately and solidify end position, can to meet the constraints relevant to the surface temperature in correction unit, and the mode making to solidify end position and become the target location of the scope of regulation controls.Therefore, if with solidify end position become machinery end mode control, then the capacity of equipment of continuous casting machine can be made to perform to the maximum high production rate maintaining product.In addition, if the mode becoming slighter compress band to make to solidify end position controls, then can prevent the variation of the inner part matter such as center segregation and generate the product of high-quality.
(embodiment)
Fig. 4 is the figure of the change of the inferred value of the surface temperature of casting position (distance of distance mould 4) before and after the measured value of surface temperature at the equipping position place of presentation surface thermometer 14 and the correction of parameter.In the present embodiment, the heat transfer coefficient h in the cooling twice band in parameter is corrected.In the diagram, line L1 represents casting position and relation between the surface temperature gone out with the parametric inference before correcting, and line L2 represents casting position and relation between the surface temperature gone out with the parametric inference after correcting.In addition, the measured value of the surface temperature at equipping position (casting position=25m) place of the land surface pyrometer 14 shown in P1 is 808 DEG C.This position as shown in a P2, be 836 DEG C with the surface temperature that goes out of parametric inference before correcting.Given this, carry out the correction making the heat transfer coefficient h in cooling twice band increase by 5%, make the inferred value of the surface temperature shown in line L2 consistent with some P1 at the equipping position (casting position=25m) of land surface pyrometer 14.
Fig. 5 be represent parameter correction before and after the figure of variations in temperature of thickness direction central portion.In Figure 5, line L3 represents casting position and relation between the temperature of thickness direction central portion gone out with the parametric inference before correcting, and line L4 represents casting position and relation between the temperature of thickness direction central portion gone out with the parametric inference after correcting.Wherein, the solidus temperature due to the steel grade of the present embodiment is 1500 DEG C, so be that the casting position of 1500 DEG C is inferred as and solidifies end position by the temperature of thickness direction central portion.That is, as used in Fig. 5 shown in some P3, what go out with the parametric inference before correcting solidifies end position for casting position=29.7m, is depicted as casting position=29.1m with end position such as the P4 that solidifies that the parametric inference after correcting goes out.
Next, with reference to Fig. 6 ~ Fig. 9, illustrate the step of the operational ton determining secondary cooling water.Wherein, in the present embodiment, the amount of change of the heat dissipation capacity of cooling twice is obtained based on the deviation of solidifying the target location of end position be pushed off.The amount of change of heat dissipation capacity can according to the operational ton of secondary cooling water and solidify end position inferred position change between relation obtain.
Fig. 6 be represent secondary cooling water operation before and after the figure of variations in temperature of thickness direction central portion.In figure 6, the relation between the temperature of the thickness direction central portion that line L4 infers under representing casting position and state before operation, the relation between the temperature of the thickness direction central portion that line L5 infers under representing casting position and state after the activation.Wherein, the line L4 of line L4 and Fig. 5 is identical.
Fig. 7 be represent secondary cooling water operation before and after the figure of variations in temperature of surface temperature.In the figure 7, the relation between the surface temperature that line L2 infers under representing casting position and state before operation, the relation between the surface temperature that line L6 infers under representing casting position and state after the activation.Wherein, the line L4 of line L2 and Fig. 4 is identical.
Fig. 8 is the figure reaching the variations in temperature of the surface temperature of front and back representing constraints.In fig. 8, the line L2 of line L2 and Fig. 7 is identical, represents the relation between casting position and the surface temperature inferred under the preoperative state of secondary cooling water.Relation between the surface temperature that line L6 infers under representing casting position and the state after the operation of secondary cooling water before constraints is reached is identical with the line L6 of Fig. 7.Relation between the surface temperature that line L7 infers under representing casting position and the state after the operation of secondary cooling water after constraints is reached.
Fig. 9 represents that constraints reaches the figure of the variations in temperature of the thickness direction central portion of front and back.In fig .9, the line L4 of line L4 and Fig. 6 is identical, represents the relation between casting position and the surface temperature inferred under the preoperative state of secondary cooling water.The line L5 of line L5 and Fig. 6 is identical, the relation of the surface temperature inferred before constraints is reached under representing casting position and the state after the operation of secondary cooling water.The relation of the surface temperature that line L8 infers under representing casting position and the state after the operation of secondary cooling water after constraints is reached.
The desired value of solidifying end position due to the steel grade of the present embodiment is 28.3m (allowed band is casting position=28.3 ~ 28.5m), so as shown in Figure 6, heat dissipation capacity is made to increase by 7.5%, the end position that solidifies be pushed off is changed to a P5 (to mould 4 side 0.8m) from a P4 from current value.Now, as shown in the line L6 of Fig. 7, pass to brittle district (surface temperature≤700 DEG C) by the correction unit R1 (casting position=15 ~ 20m) of the bending recovery by strand S.Given this, in order to the surface temperature met in correction unit R1 does not pass to this constraints of brittle district, the recruitment from the current value of the heat dissipation capacity of cooling twice is made to change to 5%.In this situation, as shown in the line L7 of Fig. 8, the surface temperature of strand S can not pass to brittle district by correction unit R1, meets constraints.In addition, solidify end position as shown in the some P8 of Fig. 9, be inferred to be casting position=28.5m, meet and make the allowed band of the target location of solidifying end position become the constraints of casting position=28.3m ~ 28.5.To sum up can confirm, change to 5% by the recruitment by the current value of the heat dissipation capacity from cooling twice, can constraints be met and end position will be solidified and control in target location (allowed band).
Above, be illustrated applying the working of an invention mode completed by present inventor, but the present invention can't help the description of a formation of the present embodiment disclosed part of the present invention and accompanying drawing and limit.That is, other embodiments, embodiment and the application technology etc. that are completed by those skilled in the art etc. based on present embodiment are all included in category of the present invention.
Industrial utilizability
In sum, what the present invention relates to solidifies end position control method and solidifies the temperature that end position control device is applicable to the strand of inferring in continuous casting machine, carrys out the technology of the curdled appearance of the strands such as control solidi fication end position.
Symbol description
1 ... continuous casting machine; 2 ... molten steel; 3 ... tundish; 4 ... mould; 5 ... dip pipe; 6 ... bearing wheel; 7a ~ 13a, 7b ~ 13b ... cooled region; 14 ... land surface pyrometer; 100 ... solidify end position control device; 101 ... temperature computation portion; 102 ... parameter correction portion; 103 ... solidify end position control part; 110 ... output device; S ... strand.
Claims (4)
1. solidify an end position control method, be to the strand in continuous casting machine solidify that end position controls solidify end position control method, it is characterized in that, comprising:
Temperature measuring step, the surface temperature more at least measuring strand of the casting direction in continuous casting machine;
Temperature infers step, is inferred the surface temperature of the strand at the measurement site place in described temperature measuring step by the conduction model of the operating condition employing continuous casting machine;
Revise step, at least one parameter in the heat transfer coefficient of the pyroconductivity comprised in described conduction model, heat transfer coefficient between mould and solidified shell and cooling twice band is revised, infers that the inferred value of the surface temperature of the strand in step is consistent to make the measured value of the surface temperature of the strand in described temperature measuring step and described temperature;
Solidify end position and infer step, utilize the conduction model employed by the revised parameter of described correction step, infer the strand temperature of surface temperature and the internal temperature comprising strand, and infer strand in continuous casting machine based on the internal temperature of the strand of inferring solidify end position;
Operational ton calculation procedure, according to by described solidify that end position infers that step obtains solidify the operational ton that end position inferred value and the deviation of solidifying end position desired value that predetermines calculate secondary cooling water;
Curdled appearance infers step, utilize the conduction model employing parameter, infer the strand temperature in continuous casting machine, and infer strand in continuous casting machine based on the internal temperature of the strand of inferring solidify end position, described parameter is the parameter parameter as the function by the revised secondary cooling water of described correction step having been substituted into the operational ton adding and calculate in described operational ton calculation procedure and the secondary cooling water obtained;
Determination step, judges to infer step the strand temperature inferred and the constraints of solidifying in the whether satisfied operation specified of end position by described curdled appearance; And
Operating procedure, when meeting described constraints in described determination step, controls cooling twice based on the operational ton calculated by described operational ton calculation procedure.
2. according to claim 1ly solidify end position control method, it is characterized in that,
When not meeting described constraints in described determination step, repeatedly perform described operational ton calculation procedure, curdled appearance deduction step and determination step until meet this constraints.
3. according to claims 1 or 2, solidify end position control method, it is characterized in that,
Constraints in described determination step solidifies the allowed band of end position and the temperature range of correction unit.
4. solidify an end position control device, be to the strand in continuous casting machine solidify that end position controls solidify end position control device, it is characterized in that possessing:
Temperature measurement unit, the surface temperature more at least measuring strand of the casting direction in continuous casting machine;
Temperature infers unit, is inferred the surface temperature of the strand at the measurement site place of described temperature measurement unit by the conduction model of the operating condition employing continuous casting machine;
Amending unit, at least one parameter in the heat transfer coefficient of the pyroconductivity comprised in described conduction model, heat transfer coefficient between mould and solidified shell and cooling twice band is revised, to make described temperature measurement unit, the measured value of the surface temperature of strand and described temperature is inferred that the inferred value of unit to the surface temperature of strand is consistent;
Solidify end position and infer unit, utilize the conduction model employed by the revised parameter of described amending unit, infer the strand temperature of surface temperature and the internal temperature comprising strand, and infer strand in continuous casting machine based on the internal temperature of the strand of inferring solidify end position;
Operational ton computing unit, according to by described solidify that end position infers that unit obtains solidify the operational ton that end position inferred value and the deviation of solidifying end position desired value that predetermines calculate secondary cooling water;
Curdled appearance infers unit, utilize the conduction model employing parameter, infer the strand temperature in continuous casting machine, and infer strand in continuous casting machine based on the internal temperature of the strand of inferring solidify end position, wherein, described parameter is the function parameter as the function by the revised secondary cooling water of described amending unit having been substituted into the operational ton adding and calculated by described operational ton computing unit and the secondary cooling water obtained;
Identifying unit, judges to infer by described curdled appearance the strand temperature that unit is inferred and solidify the constraints in the operation of the whether satisfied regulation of end position; And
Operating unit, when being judged to meet described constraints by described identifying unit, controls 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 |
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| JP2012179703 | 2012-08-14 | ||
| JP2012-179703 | 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 |
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| Publication Number | Publication Date |
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| CN104540617A true CN104540617A (en) | 2015-04-22 |
| CN104540617B CN104540617B (en) | 2016-08-24 |
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| CN201380042003.5A Active CN104540617B (en) | 2012-08-14 | 2013-07-19 | Solidification end position control method and solidification end position control device |
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| 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 |
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| 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 |
| 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 |
| CN110802208A (en) * | 2019-11-13 | 2020-02-18 | 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 |
| CN114466716A (en) * | 2019-10-03 | 2022-05-10 | 杰富意钢铁株式会社 | Device for estimating thickness of solidified shell in mold, method for estimating thickness of solidified shell in mold, and method for continuously casting steel |
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| 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 |
| 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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104540617B (en) | 2016-08-24 |
| KR101709623B1 (en) | 2017-02-23 |
| JP5585739B2 (en) | 2014-09-10 |
| IN2015DN01066A (en) | 2015-06-26 |
| KR20150033724A (en) | 2015-04-01 |
| JPWO2014027543A1 (en) | 2016-07-25 |
| WO2014027543A1 (en) | 2014-02-20 |
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