CN101745550A - Rolling temperature control device and control method thereof - Google Patents

Rolling temperature control device and control method thereof Download PDF

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Publication number
CN101745550A
CN101745550A CN200910258371A CN200910258371A CN101745550A CN 101745550 A CN101745550 A CN 101745550A CN 200910258371 A CN200910258371 A CN 200910258371A CN 200910258371 A CN200910258371 A CN 200910258371A CN 101745550 A CN101745550 A CN 101745550A
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China
Prior art keywords
rolled
cooling
control
coiling temperature
head
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CN200910258371A
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CN101745550B (en
Inventor
鹿山昌宏
栗林健
林刚资
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Hitachi Ltd
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Hitachi Ltd
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Priority to JP2008318489A priority Critical patent/JP5231968B2/en
Priority to JP2008-318489 priority
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Abstract

The present invention provides a rolling temperature control device and a control method thereof. The rolling temperature control device can control the rolling temperature of the rolled object to a target rolling temperature and controls the cooling speed to an anticipated value. The rolling temperature control device of the invention comprises the following components: a cooling head priority computing mechanism which computes and outputs the priority of an opening sequence of a plurality of cooling heads of a coiling cooling device with a mode that a target value of a cooling speed for cooling the rolled object is satisfied; a cooling head priority storing part for storing the priority of each cooling head, which is output from the cooling head priority computing mechanism; and a control instruction computing mechanism which computes the rolling temperature with a plate temperature determination model used for determining the rolling temperature of the rolled object according to a target rolling temperature, information related with the speed of the rolled object and the information of the cooling head priority storing part, computes a combination, namely a head mode for realizing opening and closing of the cooling head of the target coiling temperature with the determination result, and outputs the combination.

Description

Coiling temperature control apparatus and control method thereof
Technical field
The present invention relates to the coiling temperature control of hot rolling line, specifically, except making coiling temperature and target temperature is consistent, also relate to cooling velocity coiling temperature control apparatus and the control method thereof consistent that makes steel plate etc. be rolled part with the target cooling velocity.
Background technology
In the past, the method as carrying out coiling temperature control disclosed patent documentation 1,2.
For example, in patent documentation 1, tableization is used its information corresponding to steel grade, thickness of slab etc. to have put down in writing the priority that the head with the ejection cooling water of cooling device etc. opens and closes, the control method of the switching pattern of the refrigerating head of setting realization target coiling temperature.In addition, show and refrigerating head is opened and closed the pattern numeralization be about to each refrigerating head switching pattern with corresponding control coded representation, simplify the method for setting of the switching pattern of refrigerating head.
In addition, as not only controlling coiling temperature, also control the conventional art of the chilling temperature pattern of steel plate, for example, the method that the medium temperature between finishing mill and the coiling machine, near the coiling machine coiling temperature are controlled with high accuracy with respect to desired value respectively has been shown in patent documentation 2.
[patent documentation 1] TOHKEMY 2007-118027 communique (paragraph 0025~0028,0030, Fig. 4, Fig. 5 etc.)
[patent documentation 2] Japanese kokai publication hei 9-216011 communique (paragraph 0010~0013, Fig. 1 etc.)
The metallurgy characteristic (the ferrite particle diameter of metallic crystal etc.) of the steel plate after, known cooling finishes and the cooling velocity that mechanical property (hot strength, hardness etc.) depends on steel plate greatly (the temperature reduction of time per unit).But, be controlled to be the viewpoint of the desired value of regulation from cooling velocity with steel plate, in method in the past, there is following problem.
In patent documentation 1,, can control the cooling velocity of steel plate indirectly by setting priority with respect to refrigerating head.But, refrigerating head priority and the not direct corresponding relation of promptly not setting up steel plate cooling velocity and refrigerating head priority of steel plate cooling velocity, therefore, setting by change refrigerating head priority, can accelerate or the slow down relative control of cooling velocity, but corresponding to the cooling velocity of expectation, it is not clear and definite for good situation to set which kind of refrigerating head priority.
In addition,, therefore, under the situation that steel plate speed changes, can't tackle the variation of the cooling velocity of steel plate, can't carry out the absolute control of cooling velocity, aforesaid imappropriate situation takes place owing to define the refrigerating head priority regularly.
In patent documentation 2, in the control method of record, except coiling temperature, can also control the temperature in the centre position of the steel plate between finishing mill and the coiling machine, can pass through medium temperature, roughly control the refrigerating mode of steel plate.But, even the refrigerating mode of steel plate is identical, if the steel plate velocity variations, the just same variation that the cooling velocity of steel plate takes place.For example, under the fireballing situation of steel plate, the cooling velocity of steel plate is slack-off, and under the slow-footed situation of steel plate, the cooling velocity of steel plate accelerates.
Making during steel plate passes through of hot rolling, usually from rolling mill with low speed output after, gather way gradually, after reaching maximum speed, before the steel plate end is about to extract out from rolling mill, when extracting the steel plate end out from rolling mill, in order to suppress the terminal shake of steel plate, reduce steel plate speed without a break.
In patent documentation 2, in the method for the medium temperature of the control steel plate of record or chilling temperature pattern, there is velocity variations, the cooling velocity of steel plate can't be remained identical problem with respect to such steel plate.
Summary of the invention
The objective of the invention is to In view of the foregoing, provide a kind of coiling temperature that steel plate etc. is rolled part to be controlled to be the target coiling temperature, and the cooling velocity that is rolled part can be controlled to be the coiling temperature control apparatus and the manufacture method thereof of the value of expectation.
To achieve these goals, first coiling temperature control apparatus of the present invention is to be cooled off at the cooling device that the outlet side of this hot-rolling mill possesses by the part utilization that is rolled of hot mill rolling, the coiling temperature that is rolled part before will batching with downcoiler is controlled to be the coiling temperature control apparatus of the target coiling temperature of regulation, comprise: refrigerating head priority calculating part, the mode of the target cooling velocity of the desired value of the cooling velocity when it is rolled part to satisfy cooling, calculate a plurality of refrigerating heads that possess at cooling device opening sequence dominance relation and with its output; Refrigerating head priority storage part, it stores the priority of each refrigerating head of this refrigerating head priority calculating part output; Control instruction is calculated portion, its use is used to infer the plate temperature deduction model of the coiling temperature that is rolled part, according to the target coiling temperature, with the information of velocity correlation that is rolled part and the information of refrigerating head priority storage part, infer coiling temperature, and use this inferred results, the combination of calculating the switching of the refrigerating head that is used to realize the target coiling temperature is a head mould formula and with its output.
Second coiling temperature control apparatus of the present invention is to be cooled off at the cooling device that the outlet side of this hot-rolling mill possesses by the part utilization that is rolled of hot mill rolling, the coiling temperature that is rolled part before will batching with downcoiler is controlled to be the coiling temperature control apparatus of the target coiling temperature of regulation, comprise: refrigerating head priority calculating part, the mode of the target cooling velocity of the desired value of the cooling velocity when it is rolled part to satisfy cooling, calculate a plurality of refrigerating heads that possess at cooling device opening sequence dominance relation and with its output; Refrigerating head priority storage part, it stores the priority of each refrigerating head of this refrigerating head priority calculating part output; Control instruction is calculated portion, it uses the information of priority storage part, generation is the corresponding control coding of each head mould formula with the combination of the switching of refrigerating head, use is used to infer the plate temperature deduction model of the coiling temperature that is rolled part, according to the target coiling temperature and with the information of the velocity correlation that is rolled part, infer coiling temperature, and use this inferred results, calculate and be used to realize that target is batched the temperature controlling coding and with its output; Head mould formula transformation component, it uses the information of priority storage part, and the control transcoding, coding transform that the control instruction portion of calculating is exported is the head mould formula, exports to cooling device.
The 3rd reeling temperature controlling method of the present invention is to be cooled off at the cooling device that the outlet side of this hot-rolling mill possesses by the part utilization that is rolled of hot mill rolling, the coiling temperature that is rolled part before will batching with downcoiler is controlled to be the reeling temperature controlling method of the target coiling temperature of regulation, mode with the desired value that satisfies the cooling velocity be rolled part, opening sequence to a plurality of refrigerating heads that possess at cooling device is given priority, use priority, generating the combination that opens and closes with refrigerating head is the corresponding control coding of each head mould formula, use plate temperature to infer model, according to control coding and with the information of the velocity correlation that is rolled part, infer the coiling temperature that is rolled part, and use this inferred results, decision is used to realize that target is batched temperature controlling coding and with its output, should control transcoding, coding transform and is the head mould formula and export to described cooling device.
According to the present invention as can be known, can realize that the coiling temperature that will be rolled part is controlled to be the target coiling temperature, and the cooling velocity that is rolled part can be controlled to be the coiling temperature control apparatus and the control method thereof of the value of expectation.
Description of drawings
Fig. 1 is that expression comprises the coiling temperature control apparatus of first embodiment of the present invention and the concept map of the structure of the control system of control object.
Fig. 2 is the figure of structure of the target cooling velocity table of expression first embodiment.
Fig. 3 is the figure of structure of the velocity mode table of expression first embodiment.
Fig. 4 is that the target of expression first embodiment is batched the figure of the structure of thermometer.
Fig. 5 is the flow chart of the processing carried out of the refrigerating head priority calculation mechanism of expression first embodiment.
Fig. 6 is a key diagram of the refrigerating head of first embodiment being given the processing of priority.
Fig. 7 is a flow chart of the refrigerating head of first embodiment being given the processing of priority.
Fig. 8 is the figure of structure of the refrigerating head priority storage part of expression first embodiment.
Fig. 9 is the structure chart of the refrigerating head switching pattern and the correspondence table that corresponding therewith control is encoded of first embodiment.
Figure 10 is the flow chart that the expression first embodiment control instruction is calculated the processing of mechanism's execution.
Figure 11 is the flow chart that the coiling temperature of first embodiment is inferred the detailed process of computing.
The Figure 12 (a) and (b) figure of the example when control coding that to be expression give each position of the steel plate of first embodiment the optimal treatment of calculating mechanism by control instruction changes.
Figure 13 is the structure chart of steel plate part with the correspondence table of control coding of expression first embodiment.
Figure 14 is that the basis of first embodiment is based on each the flow chart of processing of switching of the control of head mould formula mapping device coding decision.
Figure 15 is the flow chart of the processing carried out of the refrigerating head priority calculation mechanism of second embodiment.
Figure 16 is the figure by the structure of the refrigerating head priority storage part of refrigerating head priority calculation mechanism output of expression second embodiment.
Figure 17 is the detailed flow chart of processing that the control instruction of expression second embodiment is calculated the coiling temperature prediction and calculation of mechanism.
Figure 18 is each the flow chart of algorithm of processing of switching of the control coding decision of carrying out according to head mould formula mapping device of expression second embodiment.
Figure 19 is the flow chart that the control instruction of expression the 3rd embodiment is calculated the processing of mechanism.
Label declaration:
The 100-coiling temperature control apparatus; The 111-control instruction is calculated mechanism; 114-refrigerating head priority calculation mechanism; 115-refrigerating head priority storage part; The 117-plate temperature is inferred model; 130-head mould formula mapping device; 151-steel plate (being rolled part); 153-batches cooling device (cooling device); The 154-downcoiler; 158-top cooling device (cooling device); 159-bottom cooling device (cooling device); The 160-refrigerating head; The last refrigerating head of 160a-(refrigerating head); Refrigerating head under the 160b-(refrigerating head).
The specific embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
Fig. 1 is that expression comprises the coiling temperature control apparatus 100 of first embodiment of the present invention and the concept map of the structure of the control system S of control object 150.
<<the first embodiment〉〉
The summary of<control system S 〉
The temperature of the cooling velocity of the control system S of first embodiment control steel plate that is rolled part 151 after rolling by rolling mill 152 and the steel plate 151 when being batched by downcoiler 154 obtains the mechanical property of uniform metallurgy characteristic and expectation.
Coiling temperature control apparatus 100 among the control system S possesses refrigerating head priority calculation mechanism 114, this refrigerating head priority calculation mechanism 114 is read in the steel plate target cooling velocity of having set of the steel plate 151 after rolling, calculate on the basis of the necessary distance of water-cooled according to this value and steel plate (151) speed, preferentially open the refrigerating head 160 (160a, 160b) that in the necessary distance of this water-cooled, comprises, and give priority in the mode that satisfies the target cooling velocity to each refrigerating head 160, this information is exported to refrigerating head priority storage part 115.
Also have, when the control instruction of coiling temperature control apparatus 100 is calculated mechanism 111 with reference to the content (information) of the refrigerating head priority storage part 115 of refrigerating head priority calculation mechanism 114 output, calculate the switching pattern head mould formula of refrigerating head 160 of the target coiling temperature of the steel plate 151 of realization when batching with respect to each position of the long side direction of steel plate 151 by downcoiler 154.
Through the above-mentioned result calculated that is provided with, when being discontented with any of foot-eye coiling temperature/target cooling velocity, increase and decrease steel plate (151) speed is provided with calculating once more.
Like this, in the coiling process of the steel plate that is rolled part 151 after hot rolling, on the long side direction of steel plate 151, owing to cooling velocity and coiling temperature can be controlled to be desired value, therefore, can obtain uniform metallurgy characteristic (the ferrite particle diameter of metallic crystal etc.) and mechanical property (hot strength, hardness etc.).
Thereby, can improve the composition quality of steel plate 151 (rolled product), and, can access near smooth steel plate shape.
Below, describe the control system S of first embodiment in detail.
<control system S 〉
Control system S shown in Figure 1 possesses: utilize top and the bottom cooling device 158,159 coolings batch cooling device 153 by rolling mill 152 steel plate 151 after rolling, the control object 150 that batches by downcoiler 154; Accept various signals from this control object 150, and, with the coiling temperature control apparatus 100 of control signal to 150 outputs of control object.
<control object 150 〉
Control object 150 among the control system S is the coiling temperature control production line of the steel plate 151 of hot rolling, the steel plate 151 that the about 900 ℃ temperature of cooling device 153 after will be by the steel rolling device 157 of rolling mill 152 rolling batched in utilization is cooled to about 600 ℃, is batched by downcoiler 154.
Batching cooling device 153 possesses: make the last side contacts of water w from steel plate 151, carry out the top cooling device 158 of water-cooled; Make the following side contacts of water w, carry out the bottom cooling device 159 of water-cooled from steel plate 151.
Each top and the bottom cooling device 158,159 possesses the water-cooled group 161 of the refrigerating head of emitting water w 160 (going up refrigerating head 160a, following refrigerating head 160b) of the constant radical of a plurality of combinations respectively.In this first embodiment, be that the situation of opening and closing is that example describes with the operational order of each refrigerating head 160.
Be right after steel rolling device outlet side thermometer 155 that the steel rolling device 157 of rolling mill 152 is provided with and measure temperature by the just rolling steel plate 151 of rolling mill 152, on the other hand, the temperature of the steel plate 151 before the positive coiling temperature meter that is provided with previously 156 measurements of downcoiler 154 are about to batch by downcoiler 154.
At this, the purpose of coiling temperature control is to make the temperature of the steel plate 151 that utilizes the downcoiler 154 positive fronts that coiling temperature meter 156 measures consistent with target temperature (target coiling temperature).This target temperature (target coiling temperature) can be set at constant value at each position of the long side direction of steel plate 151, also can consider coiling or batching property to the steel plate 151 of downcoiler 154, the front end of higher setting steel plate 151, the target temperature of rear end etc. are set different values according to the position.
For example, the front end of steel plate 151 becomes the core of the coiling of the steel plate 151 in the downcoiler 154, therefore need batch nattily.Therefore, under the situation of steel plate 151 softnesses, batch well, therefore, for example, be 600 ℃ under stable state, thereby higherly be set at 640 ℃, make its softness.Equally, the rear end of steel plate 151 is batched well under the high situation of temperature, therefore, is 600 ℃ under stable state, thereby higherly is set at 640 ℃ etc.
<coiling temperature control apparatus 100 〉
Coiling temperature control apparatus 100 shown in Figure 1 possesses the controlling organization of setting 110, this is provided with the steel plate 151 of controlling organization 110 after rolling and is batched before cooling device 153 coolings, calculate the control coding corresponding and each refrigerating head 160 with the switching pattern of each refrigerating head 160 switching priority and with its output.In addition, about the control coding, use Fig. 9 to be described in detail in the back.
In addition, coiling temperature control apparatus 100 possesses: when steel plate 151 is batched cooling device 153 coolings, read in the real achievements such as detected temperatures of coiling temperature meter 156 in real time, the dynamic controlling organization 120 of change control coding; With the control transcoding, coding transform is the head mould formula mapping device 130 of the switching pattern of each refrigerating head 160.
In addition, below, the set of switching pattern of the open and-shut mode of each refrigerating head 160 of expression is called the head mould formula.
At this, in the coiling temperature control apparatus 100 (with reference to Fig. 1) be provided with controlling organization 110, dynamically controlling organization 120, and head mould formula mapping device 130 for example write by C language etc., be stored in the process control computer, carry out by CPU (Central Processing Unit), realize thus.
In addition, be provided with controlling organization 110, dynamically controlling organization 120, and the implementation method of head mould formula mapping device 130 be not limited to this certainly.
Also have, control object 150 is to utilize this process control computer, controls by PLC (programmable logic controller).
<controlling organization 110 is set 〉
Controlling organization 110 is set to be possessed: refrigerating head priority calculation mechanism 114; Control instruction is calculated mechanism 111.
Refrigerating head priority calculation mechanism 114 is read in the content of target cooling velocity table 112 and velocity mode table 113, calculates the priority of opening refrigerating head 160 in the cooling of steel plate 151.
Control instruction is calculated mechanism 111 and is batched thermometer 116, target cooling velocity table 112, velocity mode table 113 etc. from refrigerating head priority storage part 115, the target of the priority of the refrigerating head 160 that stores 114 outputs of refrigerating head priority calculation mechanism and read in information, by using plate temperature to infer the computing of model 117, calculate described head mould formula as the control coding.
<dynamic controlling organization 120 〉
Dynamically controlling organization 120 possesses: use the detected temperatures that is detected by coiling temperature meter 156, will control the coiling temperature drift correction mechanism 121 of coding to the direction change of the deviation that reduces this detected temperatures and target temperature (target coiling temperature); The detected temperatures that use is detected by steel rolling device outlet side thermometer 155, the steel rolling device outlet side temperature deviation correction mechanism 122 of the direction change of the deviation of the steel rolling device outlet side temperature that the control coding is imagined when the control computing is set to this detected temperatures of compensation; Rotating speed according to steel rolling device 157 or downcoiler 154 is calculated the speed of steel plate 151, and control is encoded to the velocity deviation correction mechanism 123 of steel plate (151) velocity deviation that reduces to imagine when calculating the result and the control computing being set to the direction change of the influence of coiling temperature generation.
<target cooling velocity table 112 〉
Fig. 2 is the figure of the structure of expression target cooling velocity table 112 (with reference to Fig. 1).
The cooling velocity that target cooling velocity table 112 shown in Figure 2 stores the best corresponding with each steel grade respectively is the target cooling velocity.
Reference object cooling velocity table 112 as can be known, according to steel grade, under the situation as the SUS304 of stainless steel material is 30 ℃/s (second), under the situation as the SS400 of mild steel is 51 ℃/s (second), will make steel plate be controlled to be target by the target cooling velocity of batching cooling device 153 (with reference to Fig. 1) and get final product.
<velocity mode table 113 〉
Fig. 3 is the figure of the structure of expression velocity mode table 113 (with reference to Fig. 1).
The velocity mode that will be equipped with among Fig. 3 under the situation of tandem rolling mill of a plurality of rolling mills 152 illustrates as an example.
In velocity mode table 113 with respect to the kind (steel grade) of steel plate 151, thickness of slab, plate is wide, the speed (initial velocity) when storing the front end of the steel plate 151 after steel rolling device 157 (with reference to Fig. 1) output is rolling respectively by each layer, acceleration (first acceleration) till the front end of steel plate 151 is after this batched by downcoiler 154, after this reach the acceleration (second acceleration) till the maximal rate, maximal rate, latter stage when being decelerated to the rear end of the steel plate 151 after steel rolling device 157 output is rolling from maximal rate the deceleration (negative acceleration) during speed, reach speed in latter stage.
Control instruction shown in Figure 1 is calculated mechanism 111 and is judged that steel grade, thickness of slab, the plate of this coiled material (steel plate 151) are wide, extracts corresponding velocity mode out from speed pattern list 113.
For example, following situation is shown: at steel grade is SUS304, thickness of slab is 2.0~3.0mm, plate is wide when being 1200mm, and initial velocity is set at 650mpm (rice/minute), and first acceleration is set at 2npm/s (second), second acceleration is set at 12mpm/s, maximal rate (stabilized speed) is set at 1050mpm, and deceleration is set at 6mpm/s, and latter stage, speed was set at 900mpm.
<target is batched thermometer 116 〉
Fig. 4 is that the expression target is batched the figure of the structure of thermometer 116 (with reference to Fig. 1).
Kind (steel grade) corresponding to steel plate 151 illustrates the example of target coiling temperature by layer.
Batch in the thermometer 116 in target,, store the target temperature target coiling temperature of the best when batching by downcoiler 154 corresponding to the kind (steel grade) of steel plate 151.
The steel grade that controlling organization 110 these coiled materials of judgement (steel plate 151) are set shown in Figure 1 batches thermometer 116 from target and extracts corresponding target coiling temperature out.
The processing of<refrigerating head priority calculation mechanism 114 〉
Next, with reference to Fig. 5, the processing that refrigerating head priority calculation mechanism 114 (with reference to Fig. 1) is carried out is described.
In addition, Fig. 5 is the flow chart of the processing of expression refrigerating head priority calculation mechanism 114 execution.
In the present embodiment, the example of determining the head mould formula in the mode that satisfies the target cooling velocity when steel plate 151 is maximal rate is shown.
At first, in the S51 of Fig. 5, steel grade based on rolling steel plate 151, (with reference to Fig. 2, Fig. 1) reads in the target cooling velocity from target cooling velocity table 112, and, steel grade, thickness of slab, plate based on rolling steel plate 151 are wide, read in the velocity mode of steel plate 151 from speed pattern list 113 (with reference to Fig. 3, Fig. 1).
Next, in the S52 of Fig. 5, calculate tn cool time (s (second)) of the steel plate 151 after rolling.
Tn cool time (s) for example uses (1) formula, from the steel rolling device outlet side temperature T m that imagination when calculating is set (℃) the desired value Tc of (temperature that detects by steel rolling device outlet side thermometer 155 (with reference to Fig. 1)), coiling temperature (temperature that detects by coiling temperature meter 156 (with reference to Fig. 1)) (℃), and cooling velocity Tv (℃/s (second)) calculate.
tn=(Tm-Tc)/Tv……(1)
At steel grade is SUS304, and thickness of slab is 2.5mm, and plate is wide to be 1200mm, when steel rolling device outlet side temperature imagination value is 880 ℃, batches thermometer 116 (Fig. 4) as can be known from target, and the target coiling temperature is 750 ℃, therefore, calculates as follows by (1) formula.
(cool time) tn=(880-750)/30=4.3s
Next, in the S53 of Fig. 5, use maximal rate Vmax (mpm (meter/minute)), calculate the necessary distance L w (m) of water-cooled, determine water-cooled group 161 and refrigerating head 160.
The necessary distance L w of water-cooled is for example calculated by (2) formula.
Lw=(Vmax×tn)/60……(2)
In addition, maximal rate Vmax to be minute to be unit, and therefore, the second unit conversion of tn is minute with cool time.
In above-mentioned example, Lw is (1050 * 4.3)/60=75.25, therefore, calculates and is 75.25m.
Thereby water-cooled group 161 and the refrigerating head 160 corresponding with it from the water-cooled group 161 (near the water-cooled group 161 of rolling mill 152) of the inlet that batches cooling device 153 (with reference to Fig. 1) to 75.25m become specific water-cooled group 161 and refrigerating head 160.
At last, in the S54 of Fig. 5, utilize Fig. 6 described later, method shown in Figure 7, calculate the priority of refrigerating head 160, it is exported to refrigerating head priority storage part 115 (with reference to Fig. 1).
<give processing based on the priority to refrigerating head 160 of refrigerating head priority calculation mechanism 114 〉
Next, use Fig. 6, Fig. 7, illustrate utilize that refrigerating head priority calculation mechanism 114 (with reference to Fig. 1) carries out give the processing (S54 of Fig. 5) of priority to refrigerating head 160.
In addition, Fig. 6 is a key diagram from the processing (with reference to Fig. 7) of priority to refrigerating head 160 that give, and Fig. 7 is that (1~n) (with reference to Fig. 6) gives the flow chart of the processing of priority to refrigerating head 160.
Use Fig. 6, the consideration method of the computational methods of refrigerating head priority is described.
As shown in Figure 6, owing between the necessary distance L w of water-cooled steel plate 151 is cooled to the target cooling velocity, therefore, the refrigerating head that comprises in the necessary distance L w of water-cooled may be opened for 160 groups.
At this, for convenience of explanation, ignore water-cooled group 161, itself give the numbering of 1~n successively from the outlet side of steel rolling device 157 to refrigerating head 160.And,, give priority in the mode of uniformly-spaced opening as far as possible so that the quality of steel plate 151 becomes mode of equal value for the refrigerating head 160 of necessary amount wherein.
Below, with reference to Fig. 7, illustrate that (1~n) gives the processing of priority to refrigerating head shown in Figure 6 160.
At first, in the S71 of Fig. 7, give priority 1, in addition, give priority 2, and then give priority 3 to refrigerating head (1/2) * n to refrigerating head n to refrigerating head 1.In addition, this is treated to the processing of m=1.
And after the processing of this m=1, m is set at 2.Be m=2.
Next, in the S72 of Fig. 7,2 mBe made as denominator, generate the priority row.
Because m=2, so denominator is 4, to except be endowed the priority picks 1, (1/4) * n, (3/4) * n (2/4) * n, (the 4/4) * n, give priority picks's 4,5.
Next, in the S73 of Fig. 7, judge the end that the priority column-generation is handled.
That is, 2 mWhen being not more than n,, therefore, judge whether n<2 because all refrigerating heads are not finished giving of priority m
2 mBe not more than under the situation of n (S73 of Fig. 7 is for being), shift to the S74 of Fig. 7, m adds 1, carries out the S72 of Fig. 7, the processing of S73 repeatedly.
Its result obtains the priority row according to the binomial distribution of following (3) formula.
(1,n,(1/2)n,(1/4)n,(3/4)n,(1/8)n,(7/8)n,(3/8)n,(5/8)n,…)……(3)
Next, in the S73 of Fig. 7,2 mThan (S73 of Fig. 7 is for denying) under the big situation of n, finish the priority column-generation and handle, shift to the S75 of Fig. 7.
In the S75 of Fig. 7, with the decimal point carry, cast out each value that waits integer priority row, the result of this integer gets rid of the processing of the value of repetition.
The refrigerating head 160 that comprises among the necessary distance L w of the later water-cooled till the downcoiler 154 of refrigerating head n shown in Figure 6 is also implemented same processing, (n+1) later priority is given to uniformly-spaced open as far as possible.
In the present embodiment, cooling velocity and target cooling velocity in the time of will becoming the target coiling temperature at the outlet side of refrigerating head n have been set up relation, but as shown in Figure 6, after the air cooling zone till the downcoiler 154 between, the temperature of steel plate 151 reduces, therefore, under the control instruction of the desired value that satisfies coiling temperature, become the steel billet temperature slightly higher than target coiling temperature at the outlet side of refrigerating head n.
Thereby strictly speaking, cooling velocity becomes than the slightly slow value of desired value (target cooling velocity), but in the present embodiment, in order to simplify calculating is set, will be at the outlet side of refrigerating head n (with reference to Fig. 6), the cooling velocity when becoming the target coiling temperature is handled as the target cooling velocity.
Perhaps, also can in the processing of refrigerating head priority calculation mechanism 114 (with reference to Fig. 1), append the processing of the temperature reduction of revising above-mentioned air cooling part, the high precision int cooling velocity.
In addition, in the present embodiment, as shown in Figure 6, use refrigerating head (160) group to define the necessary distance L w of water-cooled, but can be object also with refrigerating head (160) group near downcoiler 154 near rolling mill 152.Equally, also can remove the refrigerating head of some from rolling mill 152 or downcoiler 154 after, the necessary distance L w of definition water-cooled.
And then, also can be according to steel grades such as SUS304 or SS400 etc., switch in the method for the definition of refrigerating head (160) group that comprises among the necessary distance L w of such water-cooled by layer (classification).
<refrigerating head priority storage part 115 〉
Below, be that example describes with 100 the situation of ading up to of refrigerating head 160.
Fig. 8 is the figure of structure of the refrigerating head priority storage part 115 of the expression information that stores refrigerating head priority calculation mechanism 114 (with reference to Fig. 1) output.
Fig. 8 utilizes method described 6, Fig. 7, the opening sequence of 100 refrigerating heads 160 given the figure of 1~100 priority, stores the order of the refrigerating head of preferentially opening 160.
For refrigerating head 160, again by having given numbering near the order of steel rolling device 157 (with reference to Fig. 1), for example (1,1) expression is near first refrigerating head 160 of the first water-cooled group 161 of steel rolling device (with reference to Fig. 1).In the example of figure, illustrated from (1,1) according to (1,3), (1,5), (1,7), (2,1) ..., (12,6), (12,8) order situation about preferentially opening.
<control coding 〉
In present embodiment (the present invention), the head mould formula is encoded by the control of correspondence and is showed.
The control coding of controlling organization 110 outputs and the correspondence of head (switching) pattern are set shown in Fig. 9.In addition, Fig. 9 is the structure chart that refrigerating head opens and closes the correspondence table of pattern and the control coding corresponding with it.
In Fig. 9, control coding 0 is a standard-sized sheet, and 100 is full cut-off.
Below, with the head mould formula of the refrigerating head 160 of only opening priority 1 be 99, the head mould formula of opening two refrigerating heads of priority 1 and 2 is that 98 mode is controlled numeralization.
Controlling organization 110 (with reference to Fig. 1) is set to be exported the control coding corresponding with such refrigerating head switching pattern to head mould formula mapping device 130 (with reference to Fig. 1).
That is, the control coding of having opened the state of all refrigerating heads 160 is made as 0, the control coding of having closed the state of all refrigerating heads 160 is made as 100.
And, set up corresponding relation with the content of refrigerating head priority storage part 115, will be only the state opened of pattern (1,1) be made as control coding 99, the state that (1,1) and (1,3) is opened is made as control coding 98, with (1,1), (1,3), and (1,5) state of opening be made as control coding 97, under these main points, below, give control coding that control is encoding to the state that all refrigerating heads 160 open promptly till 0 to the pattern of opening of refrigerating head 160.
<control instruction is calculated the processing of mechanism 111 〉
Next, with reference to Figure 10, illustrate that control instruction calculates the processing of mechanism 111 (with reference to Fig. 1).
Figure 10 is the flow chart that the expression control instruction is calculated the algorithm of the processing that mechanism 111 carries out.
In the S101 of Figure 10, based on the value by layer classification corresponding of reading in from speed pattern list 113 (with reference to Fig. 3) with cooling metal sheets, calculate as described below steel plate 151 from steel rolling device 157 output the time first quicken starting position SL1s, second and quicken starting position SL2s, stabilized speed starting position SLcs, be used for from the stabilized speed deceleration starting position SLds that speed shifts to latter stage, the output from steel rolling device 157 (with reference to Fig. 1) of calculating steel plate 151 begins the velocity mode till the end of batching to downcoiler 154.
At this, the first acceleration starting position SL1s, second quickens starting position SL2s, stabilized speed starting position SLcs, deceleration starting position SLds, deceleration end position SLde can calculate by (4) formula shown below~(8) formula respectively.
(first quickens the starting position) SL1s=Lsc ... (4)
Wherein, LSc: constant
Consider condition as described below, suitably stipulate Lsc.
For example, if initial steel plate is fast by speed, then because collision etc., the front end of the steel plate 151 steel rolling device 157 of normally not nipping, it is bad to nip, if initial steel plate is slow by speed, then productivity ratio is not high, perhaps steel plate 151 is under the situation of slab, because initial steel plate is unhappy by speed, therefore can quicken in advance, steel plate 151 is under the situation of thin plate, because initial steel plate is fast by speed, therefore, also can postpone to quicken or the like.
(second quickens the starting position) SL2s=Lmd ... (5)
Wherein, Lmd: 154 distance from steel rolling device 157 to downcoiler
(V1a) 2=Lmd×2×Acc1+Vmax×Vmax
(stabilized speed starting position) SLcs={Lmd+ (Vmax-V1a)/Acc2 * (Vmax+V1a)/2} ... (6)
Wherein, V1a: first quickens end speed
Acc1: first acceleration
Acc2: second acceleration
Vmax: maximal rate
(deceleration starting position) SLds={Striplen-(Vmax-Vf)/Dcc * (Vmax+Vf)/2-dccmargin} ... (7)
Wherein, Striplen: steel plate length
Vf: latter stage speed
Dcc: deceleration
Dccmargin: steel plate 151 is being extracted the terminal boundary that finishes deceleration before how far out from steel rolling device 157 (with reference to Fig. 1)
(deceleration end position) S L de={S triplen-d ccmargin} ... (8)
According to the velocity mode of calculating, after the S102 of Figure 10, infer the computing of model 117 by having used plate temperature, calculate the head mould formula that realizes the target coiling temperature.
In the present embodiment, definition along the zone that long side direction is divided, illustrates steel plate 151 about each zone, according to following linear inverse interpolation, the example of calculating the head mould formula.
In the S102 of Figure 10, about the each several part of steel plate 151, two control codings nL, nH of the control coding that the definition double team is separated.
At this, exist between the standard-sized sheet of the refrigerating head for 100 (160) quantity and the full cut-off and separate, therefore, nL=0, nH=100.At this, owing to follow the increase of control coding, the quantity of the refrigerating head of opening (160) merely reduces, and therefore, when n1<n2, about target temperature Tc1, the Tc2 corresponding with described head mould formula, Tc1<Tc2 sets up.
Next, in the S103 of Figure 10, nL and nH on average be made as n0.
Then, in the S104 of Figure 10,, utilize and used plate temperature to infer the computing of model 117, infer centre or the coiling temperature corresponding with it by each zone about the control coding of giving to each zone.That is, use the control coding of giving to each zone, infer the centre/coiling temperature in zone.
Control coding is by each region allocation, and the influence of the speed that centre/coiling temperature is given is also different, therefore, carries out this computing by each zone.
In addition, use Fig. 1, in the use of the S104 of back narration Figure 10 plate temperature infer that the coiling temperature of model 117 infers computing.
In the S105 of Figure 10, by the deduction temperature T c0 of each region decision, under the situation of Tc0>Ttarget, between nL and n0, separate with respect to target temperature Ttarget, therefore, n0 is made as nH again.
On the contrary, under the situation of Tc0<Ttarget, between n0 and nH, separate, therefore, n0 is made as nL again.
In the S106 of Figure 10, judge whether to satisfy the termination condition of algorithm.
In addition, the end of algorithm is that condition is judged with any establishment of " finishing the above repetition of constant number of times of S103~S105 of Figure 10 " or " inferring that temperature T c and the deviation of target temperature Ttarget are below the steady state value " or " any of n0 and nH, nL is consistent ".
Under the situation of the termination condition of the S106 that does not satisfy Figure 10 (S106 of Figure 10 for not), carry out S103~S105 of Figure 10 repeatedly.On the other hand, under the situation of the termination condition of the S106 that satisfies Figure 10, finish.
In addition, as the method for giving of control coding, also can with present embodiment on the contrary, the control coding of all refrigerating heads 160 closing state is made as 0, the control coding of the state that all refrigerating heads 160 are opened is made as 100, gives accordingly.
As mentioned above, by importing the control coding, can utilize simple calculations to calculate the control instruction value.
<coiling temperature is inferred computing (S104 of Figure 10) 〉
Next, illustrate Figure 10 S104 use plate temperature infer that the coiling temperature of model 117 infers computing.
The coiling temperature corresponding with the S104 of Figure 10 inferred the detailed processing of computing shown in Figure 11.In addition, Figure 11 has been to use plate temperature to infer the flow chart that the coiling temperature of model 117 is inferred the detailed process of computing.
Temperature as steel plate 151 is inferred operation method, be described as follows example, promptly, cut apart along long side direction and to begin to steel plate (151) terminal by the steel plate 151 till the coiling temperature meter 156 (with reference to Fig. 1) from steel rolling device 157 output, make the moment advance the cooling performance of Difference Calculation steel plate 151 with constant moment Δ.
In the S111 of Figure 11, the update calculation moment, and then calculate the plate speed Vt in the corresponding moment by the velocity mode that in the S101 of Figure 10, generates.
Next, in the S112 of Figure 11, use the plate speed Vt that calculates, calculate the output length L n under the current time from steel rolling device 157 (with reference to Fig. 1).
In addition, output length L n can calculate by following (9) formula for finishing the length of rolling steel plate 151 from 157 outputs of steel rolling device.Wherein Ln-1 is the preceding output length of (before the delta time) constantly of calculating.
Ln=Ln-1+Δ·Vt……(9)
In the S113 of Figure 11, judge whether computing finishes.
At this, when adding the value of distance greater than the total length of steel plate 151 from steel rolling device 157 to coiling temperature meter 156 from the output length L n of steel rolling device 157 (with reference to Fig. 1), be all over (151) corresponding coiling temperature prediction and calculation of steel plate, therefore, computing finishes.
Under the unclosed situation of computing (S113 of Figure 11 is for denying), in the S114 of Figure 11, carry out the temperature of steel plate 151 and follow the tracks of.
That is, because the relation by Ln and Ln-1 is as can be known with respect to the position of the steel plate 151 in the preceding moment, through the Δ degree after the time, steel plate 151 which kind of degree of advancing, therefore, the processing that makes the Temperature Distribution of steel plate 151 move correspondence apart from degree.
In the S115 of Figure 11, between Δ, the steel plate 151 of discharging from steel rolling device 157 (with reference to Fig. 1) is set steel rolling device (157) outlet side temperature.
In the S116 of Figure 11, about each refrigerating head 160, determine corresponding zone respectively, according to the value of the control coding of giving to the zone and the refrigerating head priority of reading in, determine the switching of this refrigerating head 160 from refrigerating head priority storage part 115 (with reference to Fig. 1).Then, by this information, judge that the boundary condition at each position of steel plate 151 is water-cooled or air cooling.In addition, the position of the steel plate 151 of the water w of each refrigerating head 160 contact is a water-cooled, and the position of the steel plate 151 that the water w of each refrigerating head 160 does not contact is an air cooling.
Promptly, steel plate (151) zone corresponding with each refrigerating head 160 for be located substantially on each refrigerating head 160 under or directly over steel plate part, but in fact coiling temperature control apparatus 100 (with reference to Fig. 1) sends to each refrigerating head 160 and opens and closes the instruction back have about 2 seconds time delay till the state on steel plate (151) surface changes.
Therefore, in fact predict this time delay, steel plate (151) part that decision is corresponding.
The boundary condition of the each several part of steel plate 151 is under the situation of water-cooled, in the S117 of Figure 11, for example, according to (10) formula, calculates heat transfer coefficient hw.
hw=9.72*10 50.355*{(2.5-1.15*log?Tw)*D/(pl*pc)} 0.646/(Tsu-Tw)……(10)
Wherein, ω: water yield density
Tw: water temperature
D: the nozzle diameter of refrigerating head 160
Pl: the injector spacing of the refrigerating head 160 of production line direction (left and right directions of the control object 150 of Fig. 1)
Pc: with the injector spacing of the refrigerating head 160 of the direction of production line quadrature
Tsu: the surface temperature of steel plate 151
(10) formula is the heat transfer coefficient under the situation of so-called laminar flow cooling.
As water-cooling method, there is sputter cooling etc. various in addition, the known calculating formula that several heat transfer coefficients are arranged.In addition, even the type of cooling is identical, as mathematical expression, sometimes because up-to-date experiment opinion of reflection etc. and different.
On the other hand, under the situation of air cooling, in the S118 of Figure 11, for example, according to (11) formula, according to the heat Calculation heat transfer coefficient hr that draws by radiation.
hr=σ·ε[{(273+Tsu)/100} 4-{(273+Ta)/100} 4]/(Tsu-Ta)……(11)
Wherein, σ: Si Difen-Boltzmann constant (=4.88)
ε: radiance
Ta: air themperature (℃)
Tsu: the surface temperature of steel plate 151
About the surface and the back side of steel plate 151, according to the state of cooling, calculating with (10) formula and (11) formula is the heat transfer coefficient formula of representative, respectively the heat amount of movement on quantification steel plate (151) surface.
Then, in the S119 of Figure 11,,,, calculate the Temperature Distribution of the steel plate 151 between steel rolling device 157 and the coiling temperature meter 156 by the temperature that moves each position of calculating steel plate 151 of the heat between the plus-minus Δ based on through the temperature before the Δ.
Its result obtains the temperature of steel plate 151 of the installation site of coiling temperature meter 156, and the ratio installation site of coiling temperature meter 156 is used in later calculating next time by the temperature of the steel plate 151 of upstream.
Move if can ignore the heat of the thickness direction of steel plate 151, then, can utilize (12) formula to calculate about each position of the long side direction of steel plate 151.
Tn=Tn-1-(ht+hb)*Δ/(ρ*C*B)……(12)
Wherein, Tn: current plate temperature
Tn-1: the plate temperature before the Δ
Ht: the heat transfer coefficient of surface of steel plate
Hb: the heat transfer coefficient at the steel plate back side
ρ: the density of steel plate
C: the specific heat of steel plate
B: the thickness of steel plate
In addition, if the width of steel plate 151 is narrow, then narrow part is by refrigerating head 160 coolings, and on the other hand, if the width of steel plate 151 is wide, then wide part is by refrigerating head 160 coolings, therefore, is thought of as that dimension is 1 on the direction of steel plate 151.
In addition, consider at needs can calculate by separating the heat equation of knowing under the heat conducting situation of thickness direction of steel plate 151.This heat equation represented by (13) formula, and steel plate 151 is cut apart and utilized the method for this heat equation of computer Difference Calculation to be disclosed in the various documents along thickness direction.
∂ T / ∂ t = { λ / ( ρ * C ) } ( ∂ 2 T / ∂ x 2 ) · · · · · · ( 13 )
Wherein: λ: pyroconductivity
T: material temperature
T: time
X: thickness direction coordinate
Then, in the S1110 of Figure 11, judge whether required calculating finishes on steel plate (151) long side direction in the production line from steel rolling device 157 (with reference to Fig. 1) to coiling temperature meter 156.
On steel plate in production line (151) long side direction under the required unclosed situation of calculating (S1110 of Figure 11 for not), carry out S116~S119 of Figure 11 repeatedly.
On the other hand, under the situation that required calculating finishes on the steel plate in production line (151) long side direction (S1110 of Figure 11 is for being), in the S113 of Figure 11, carry out S111~S1110 of Figure 11 between the end of judgement computing repeatedly.
In addition, used above-mentioned plate temperature to infer that the coiling temperature of model 117 infers that computing represents an example, also can be according to new opinion etc., suitably apply change, be not limited to this certainly.
<control instruction is calculated the processing example of mechanism 111 〉
The figure of an example when Figure 12 (a) and (b) optimal treatment that to be control codings of giving to each position of steel plate 151 (with reference to Fig. 1) of expression calculate mechanism 111 by control instruction shown in Figure 10 changes.
Shown in Figure 12 (a), in handling for the first time, carry out at each position that (nL=0, processing nH=100) therefore, give 50 in the whole zone of steel plate 151 with respect to identical initial value.
In handling the second time shown in Figure 12 (b), with respect to control coding 50, because predicting the outcome of the coiling temperature Tc0 at each position of steel plate 151 is bigger or little than Trarget, the control coding of therefore giving is different.
In the present embodiment, the partial update near front end, rear end that shows steel plate (151) speed and be the steel plate 151 of low speed is to close the control of the direction of refrigerating head 160 coding, and steel plate (151) speed is updated to the example of the control coding of the direction of opening refrigerating head 160 for the central portion of steel plate 151 at a high speed.
Specifically, second time shown in Figure 12 (b) handles, and the leading section of steel plate 151, rearward end are updated to nL=50 in the S105 of Figure 10 of primary processing, the result of nH=100, the control coding be updated to as its average 75.
On the other hand, central portion is updated to nL=0 in the S105 of Figure 10 of primary processing, the result of nH=50, and the control coding is updated to 25.
Like this, by carrying out S103~S106 of Figure 10 repeatedly, upgrade the control coding successively.
The example of the control coding of the final output of controlling organization 110 (with reference to Fig. 1) is set shown in Figure 13.In addition, Figure 13 is expression steel plate part and the structure chart of controlling the correspondence table of encoding.
In example shown in Figure 13, steel plate 151 correspondences are divided into grid from the distance of front end with 1m unit, corresponding to mesh, distribute the control coding.
As shown in Figure 1, cooling device has top cooling device 158 and bottom cooling device 159 corresponding to the surface and the back side of steel plate 151, therefore, as the control coding, corresponding to last refrigerating head 160a and following refrigerating head 160b, output respectively.
Shown in Figure 13 as follows: about the long side direction of steel plate 151, control from the last refrigerating head 160a of front end 1m is encoded to 95, the control coding of following refrigerating head 160b also is 95, between from 500m to 501m, the control of last refrigerating head 160a is encoded to 14, and the control coding of following refrigerating head 160b also is 14.
In addition, in Figure 13, though identical with the control coding of corresponding last refrigerating head 160a in the same position of steel plate 151 and following refrigerating head 160b, also can set different control and encode.
The control coding that controlling organization 110 outputs are set shown in Figure 1 is revised actual the utilization in top and the bottom cooling device 158,159 cooling metal sheets 151 in real time by dynamic controlling organization 120.
Dynamically controlling organization 120 possesses: use the detected temperatures from coiling temperature meter 156, revise the coiling temperature drift correction mechanism 121 of the deviation of itself and target temperature; Use is from the detected temperatures of steel rolling device outlet side thermometer 155, the steel rolling device outlet side temperature deviation correction mechanism 122 of the deviation of the steel rolling device outlet side temperature of imagining when revising it and the control computing being set; Correction according to the rotating speed of steel rolling device 157 or downcoiler 154 calculated the speed of steel plate 151 the result, with the velocity deviation correction mechanism 123 that the steel plate velocity deviation that control imagines during computing is set.The summation Δ Tc of described correction is multiplied by influence coefficient Be scaled the variable quantity of control coding Δn ( = ( ∂ n / ∂ Tc ) · ΔTc ) Be output as the correction of dynamic controlling organization 120.
The calculating of correction can passing ratio integration (PI) the suitable grade of control etc. realize.
As shown in Figure 1, according to correction amount n, revise the control coding that controlling organization 110 outputs are set from dynamic controlling organization 120 outputs.
<head mould formula mapping device 130 〉
Next, head mould formula mapping device 130 (with reference to Fig. 1) is described.
Figure 14 represents the algorithm that head mould formula mapping device 130 is carried out, and is the flow chart of basis based on the processing of the switching of each refrigerating head 160 of control coding decision of head mould formula mapping device 130.
In the S141 of Figure 14, calculate distance L h from front end by the steel plate 151 under the refrigerating head (160).Usually, coiling temperature control apparatus 100 (with reference to Fig. 1) uses with various purposes, and therefore, the such range information of computation of Period with short is stored in it in storage part (not shown) of coiling temperature control apparatus 100.
In the S142 of Figure 14, whether judging distance Lh is less than 0.
Distance L h less than 0 situation under (at the S142 of Figure 14 for being), therefore the corresponding refrigerating head 160 of steel plate 151 no shows, skips processing, shifts to S145.
On the other hand, under Lh is situation more than 0,, therefore, in the S143 of Figure 14, extracts the control corresponding and encode with distance L h because steel plate 151 arrives corresponding refrigerating head 160.That is, contrast steel plate (151) position of distance L h and Figure 13, determine the last refrigerating head 160a and the following refrigerating head 160b at the position corresponding, extract the control coding of refrigerating head 160a on this and the control coding of following refrigerating head 160b out with distance L h.
In the S144 of Figure 14, extract refrigerating head (160) switching pattern out from the control coding.That is, use corresponding with from the relevant information of priority that the refrigerating head 160 that controlling organization 110 accepts is set and control coding shown in Figure 9 and head mould formula, determine to open to priority and be till what the refrigerating head 160.
That is, use the information that stores at refrigerating head priority storage part 115, definite refrigerating head of specifically opening 160, the order of the switching of this refrigerating head 160 of final decision.
In the S145 of Figure 14, judge whether the computing about all refrigerating heads 160 finishes.
(S145 of Figure 14 is for denying) shifts to the S141 of Figure 14 under unclosed situation, and the processing of carrying out S141~S145 of Figure 14 repeatedly extremely finishes.
In addition, in the present embodiment, be that example is illustrated with the quantity of refrigerating head 160 in the situation that is 100 up and down, but, can suitably select various quantity according to equipment as refrigerating head quantity.
<<the second embodiment〉〉
In the first embodiment, illustration the maximum speed of the priority of refrigerating head 160 and steel plate 151 is set up corresponding relation and situation about determining.But, under the situation of this method, produce following phenomenon, that is, when steel plate (151) speed was not maximum speed, the cooling velocity of realization became faster than desired value corresponding to steel plate (151) speed.
Second embodiment is with respect to various steel plates (151) speed that realizes according to velocity mode, and precision realizes that well the target cooling velocity is a purpose, according to the speed of steel plate 151, switches the situation of the priority of refrigerating head 160.
Figure 15 is the flow chart of the processing carried out of the refrigerating head priority calculation mechanism 114 of second embodiment.
In the S151 of Figure 15, read in the velocity mode of target cooling velocity and steel plate 151 respectively from target cooling velocity table 112 and velocity mode table 113.
Next, in the S152 of Figure 15,, calculate tn cool time according to described (1) formula.When 880 ℃ of SUS304, thickness of slab 2.5mm, the wide 1200mm of plate, steel rolling device outlet side temperature imagination values, batch thermometer 116 (Fig. 4) as can be known according to target, the target coiling temperature is 750 ℃, therefore, cool time, tn was (880-750)/30=4.3, therefore, became 4.3s (second).
Next, in the S153 of Figure 15,, use initial velocity Vstart, calculate the necessary distance L ws of water-cooled, determine to carry out the water-cooled group 161 and the refrigerating head 160 of water-cooled with reference to velocity mode table 113 shown in Figure 3.
The necessary distance L ws of water-cooled for example calculates by (14) formula.
Lws=(Vstart×tn)/60……(14)
In above-mentioned example, the necessary distance L ws of water-cooled is
Therefore (650 * 4.3)/60=46.58, becomes 46.58m.
Thereby, become specific water-cooled group 161 and refrigerating head 160 with it from the water-cooled group 161 and the refrigerating head 160 corresponding of the water-cooled group 161 of the inlet that batches cooling device 153 (with reference to Fig. 1) the water-cooled group 161 of rolling mill 152 (near) till 46.58m.
In the S154 of Figure 15,, calculate the refrigerating head priority corresponding in the same manner with initial velocity Vstart with first embodiment according to described Fig. 6, processing shown in Figure 7.
In the S155 of Figure 15, use maximal rate Vmax, calculate the necessary distance L wm of water-cooled, determine to carry out the water-cooled group 161 and the refrigerating head 160 of water-cooled.The necessary distance L wm of water-cooled for example calculates by (15) formula.
Lwm=(Vmax×tn)/60……(15)
With regard to Lwm, with first embodiment in the same manner, with reference to velocity mode table 113 shown in Figure 3 as can be known, therefore (1050 * 4.3)/60=75.25 becomes 75.25m.
Thereby water-cooled group 161 and the refrigerating head 160 corresponding with it from the water-cooled group 161 (near the water-cooled group 161 of rolling mill 152) of the inlet that batches cooling device 153 to 75.25m become specific water-cooled group 161 and refrigerating head 160.
In the S156 of Figure 15,, calculate the refrigerating head priority corresponding with maximal rate Vmax by identical step according to described Fig. 6, processing shown in Figure 7.
In the S157 of Figure 15, use speed Vend in latter stage, calculate the necessary distance L we of water-cooled, determine to carry out the water-cooled group 161 and the refrigerating head of water-cooled.The necessary distance L we of water-cooled for example calculates by (16) formula.
Lwe=(Vend×tn)/60……(16)
Equally, with regard to the necessary distance L we of water-cooled, with reference to velocity mode table 113 shown in Figure 3 as can be known, therefore (900 * 4.3)/60=64.5, becomes 64.5m.
Thereby water-cooled group 161 and the refrigerating head 160 corresponding with it from the water-cooled group 161 (near the water-cooled group 161 of rolling mill 152) of the inlet that batches cooling device 153 to 64.5m become specific water-cooled group 161 and refrigerating head 160.
In the S158 of Figure 15,, calculate and the corresponding refrigerating head priority of speed in latter stage by identical step according to described Fig. 6, processing shown in Figure 7.
In the S159 of Figure 15, will export to refrigerating head priority storage part 115 (with reference to Fig. 1) with the corresponding result of calculation of initial velocity Vstart, maximal rate Vmax, latter stage speed Vend.
The content of refrigerating head priority storage part 115 is sent to head mould formula mapping device 130 with the result that is provided with of control coding from the controlling organization 110 that is provided with shown in Figure 1.
Figure 16 is the figure of structure of the refrigerating head priority storage part 115 of expression refrigerating head priority calculation mechanism 114 output that utilizes second embodiment.
In this second embodiment, according to steel plate (151) speed, the necessary distance L ws of water-cooled, Lwm, Lwe difference in the scope of 47.58m~76.52m, therefore, be used to realize that its refrigerating head priority is also different, as shown in figure 16, will give to each refrigerating head 160 with the corresponding priority of initial velocity Vstart, maximal rate Vmax, latter stage speed Vend.
The control instruction of<the second embodiment is calculated the coiling temperature prediction and calculation of mechanism 111 〉
Figure 17 is the flow chart of details of the processing of the expression second embodiment control instruction coiling temperature prediction and calculation of calculating mechanism 111.
The flow process of handling is identical with Figure 11, but additional S176 is arranged, and in the processing of the S 176 of Figure 17, according to current steel plate (151) speed, selects to extract out which of three kinds of priorities of storage in the refrigerating head priority storage part 115 shown in Figure 16, and extraction.
In the S177 of Figure 17, about each refrigerating head 160, determine the zone of the correspondence of steel plate 151 respectively, according to the value of the control coding of giving to the zone and the refrigerating head priority of extraction, determine the switching of corresponding refrigerating head 160.
The processing of the head mould formula mapping device 130 of<the second embodiment 〉
Each the flow chart of algorithm of processing of switching of Figure 18 control coding decision that to be expression carry out according to the head mould formula mapping device 130 (with reference to Fig. 1) of second embodiment.
Flow process and described Figure 14 of head mould formula mapping device 130 are roughly the same, but by additional S184, in the processing of the S184 of Figure 18, according to current steel plate (151) speed, select to use from which of three kinds of refrigerating head priorities that controlling organization 110 (with reference to Fig. 1) accepts is set, and decision.
In the S185 of Figure 18, the refrigerating head priority of using the control coding and selecting is extracted refrigerating head out and is opened and closed pattern.
That is, use information relevant and the control coding shown in Fig. 9 and refrigerating head to open and close the corresponding of pattern, determine to open to priority for till what the refrigerating head 160 with the priority of the refrigerating head of selecting 160.
According to above-mentioned second embodiment as can be known, owing to, switch the priority of refrigerating head 160 according to the speed of steel plate 151, therefore, even under the situation of the velocity variations of steel plate 151, also can precision realize the target cooling velocity well.
<<the three embodiment〉〉
The 3rd embodiment is owing to batch the cause of the cooling capacity of cooling device 153, can't satisfy the target cooling velocity, or the necessary distance of the water-cooled of guaranteeing to satisfy the target cooling velocity, and be provided with under the situation of calculating, calculate the situation of the processing when having appended in the algorithm that mechanism 111 carries out that coiling temperature can't reach target temperature in control instruction shown in Figure 1.
Figure 19 is the flow chart that the control instruction of the 3rd embodiment that expression has added such processing is calculated the processing of mechanism 111.
The S191 of Figure 19~196 are identical with the processing of calculating mechanism 111 in the control instruction shown in Figure 10 of first embodiment, but in addition, be provided with calculate finish after, in the S197 of Figure 19, judge whether to reach target coiling temperature and target cooling velocity.
Under situation about all reaching (S197 of Figure 19 is for being), end process, on the other hand, and under situation about not reaching (S197 of Figure 19 is for denying), in the S198 of Figure 19, the maximal rate of change steel plate 151.
When coiling temperature is lower than the target coiling temperature, shorten the time of cooling metal sheets 151, therefore, in the scope that device-restrictive is allowed, increase the maximal rate of steel plate 151.On the contrary, when coiling temperature is higher than the target coiling temperature, prolong the time of cooling metal sheets 151, therefore, reduce the maximal rate of steel plate 151, reduce the processing of coiling temperature.
In addition, in the time can't reaching the target cooling velocity, reduce the maximal rate of steel plate 151 equally, prolong the time of cooling, increase the processing of cooling velocity.
With regard to the change amount of the maximal rate under the situation separately, can wait with table in advance to define, also can calculate the value of the degree of discontented foot-eye coiling temperature or target cooling velocity at every turn.
Under situation about calculating, for example, can't reach under the situation of target coiling temperature, according to the formula of following (17), calculate speed change amount Δ Vmax, the maximal rate of change steel plate 151 gets final product.
Δ V max = ( ∂ V / ∂ Tc ) · δTc · · · · · · ( 17 )
Wherein, δ Tc: the target coiling temperature amount of not reaching
The corresponding constant (influence coefficient) of influence with velocity variations to the coiling temperature generation
Below, under the maximal rate of the steel plate 151 that changes, carry out the processing of S191~S198 of Figure 19 repeatedly.
According to above-mentioned the 3rd embodiment as can be known, in restriction owing to cooling capacity, in the time of can't satisfying these two control of target coiling temperature and target cooling velocity target simultaneously, can in the scope of equipment permission, realize the control target simultaneously by the speed of increase and decrease steel plate 151.
<<sum up〉〉
The invention provides a kind of coiling temperature control apparatus 100, it comprises: the refrigerating head priority calculation mechanism 114 of calculating the priority that the refrigerating head (160) corresponding with steel plate (151) speed open and close according to the velocity mode of the target cooling velocity of steel plate 151 and steel plate 151; The refrigerating head priority storage part 115 of the refrigerating head priority that storage is calculated; With target coiling temperature, velocity mode, and the refrigerating head priority as input information, use plate temperature to infer model 117, the control instruction that the command value of cooling device that realizes the coiling temperature of expectation is calculated with the form of control coding is calculated mechanism 111; Using the refrigerating head priority corresponding with steel plate speed, is the head mould formula mapping device 130 that batches the refrigerating head switching pattern of cooling device 153 with the control transcoding, coding transform.
Refrigerating head priority calculation mechanism 114 is read in the target cooling velocity, calculate the necessary distance of water-cooled according to this value and steel plate (151) speed, then, will preferentially open at this refrigerating head that comprises 160, and, give priority to each refrigerating head 160 in the mode that satisfies the target cooling velocity.
Control instruction is calculated the content of mechanism 111 with reference to the refrigerating head priority storage part 115 of refrigerating head priority calculation mechanism 114 output, simultaneously, with respect to each position of the long side direction of steel plate 151, calculates the head mould formula that realizes the target coiling temperature.
Through the above-mentioned result calculated that is provided with, when being discontented with any of foot-eye coiling temperature/target cooling velocity, increase and decrease steel plate (151) speed is provided with calculating once more.
<<effect effect〉〉
According to said structure as can be known, the batching in the control of the steel plate 151 after hot rolling, any position at the long side direction of steel plate 151 all obtains uniform cooling velocity and coiling temperature.
In addition, in said embodiment, as being rolled part, illustration steel plate and being illustrated, but for the part that is rolled beyond the steel plate, can certainly be suitable for the present invention.
Utilizability on the industry
Can be widely applicable in the cooling control of hot rolling line.

Claims (12)

1. coiling temperature control apparatus, to cool off at the cooling device that the outlet side of this hot-rolling mill possesses by the part utilization that is rolled of hot mill rolling, the described coiling temperature that is rolled part before will being batched by downcoiler is controlled to be the target coiling temperature of regulation, described coiling temperature control apparatus is characterised in that, comprising:
Refrigerating head priority calculating part, the mode of the target cooling velocity of the desired value of its cooling velocity when satisfying that cooling is described to be rolled part, calculate a plurality of refrigerating heads that possess at described cooling device opening sequence dominance relation and with its output;
Refrigerating head priority storage part, it stores the priority of each described refrigerating head of this refrigerating head priority calculating part output;
Control instruction is calculated portion, its according to described target coiling temperature, with the information of the described velocity correlation that is rolled part and the information of described refrigerating head priority storage part, use is used to infer the described plate temperature deduction model that is rolled the coiling temperature of part, infer described coiling temperature, and use this inferred results, the switching combination of calculating the described refrigerating head that is used to realize described target coiling temperature is a head mould formula and with its output.
2. coiling temperature control apparatus, to cool off at the cooling device that the outlet side of this hot-rolling mill possesses by the part utilization that is rolled of hot mill rolling, the described coiling temperature that is rolled part before will being batched by downcoiler is controlled to be the target coiling temperature of regulation, described coiling temperature control apparatus is characterised in that, comprising:
Refrigerating head priority calculating part, the mode of the target cooling velocity of the desired value of its cooling velocity when satisfying that cooling is described to be rolled part, calculate a plurality of refrigerating heads that possess at described cooling device opening sequence dominance relation and with its output;
Refrigerating head priority storage part, it stores the priority of each described refrigerating head of this refrigerating head priority calculating part output;
Control instruction is calculated portion, it uses the information of described priority storage part, generating with the switching combination of described refrigerating head is the corresponding control coding of each head mould formula, according to described target coiling temperature and with the described information that is rolled the velocity correlation of part, use is used to infer the described plate temperature deduction model that is rolled the coiling temperature of part, infer described coiling temperature, and use this inferred results, calculate the described control coding that is used to realize described target coiling temperature and its output;
Head mould formula transformation component, it uses the information of described priority storage part, is the head mould formula with the described control transcoding, coding transform of the described control instruction portion of calculating output, to described cooling device output.
3. coiling temperature control apparatus according to claim 2 is characterized in that,
Described control coding is set up corresponding relation and is, the state that described refrigerating head is all opened is made as maximum, and the state of described refrigerating head Close All is made as minimum of a value, and follow the increase of the size of described control coding, the inferred value of described coiling temperature is dull to be reduced.
4. coiling temperature control apparatus according to claim 2 is characterized in that,
Described control coding is set up corresponding relation and is, the state that described refrigerating head is all opened is made as minimum of a value, and the state of described refrigerating head Close All is made as maximum, and follow the increase of the size of described control coding, the inferred value of described coiling temperature is dull to be increased.
5. according to each described coiling temperature control apparatus in the claim 1~4, it is characterized in that,
Described when described refrigerating head priority calculating part enters according to described cooling device be rolled the temperature of part and batch by described downcoiler before the described target coiling temperature that is rolled part, calculate the described temperature reduction amount that is rolled part in the described cooling device, target cooling velocity according to the desired value of this temperature reduction amount and the described cooling velocity that is rolled part, calculate the required time of cooling, according to required time of this cooling and with the described information that is rolled the velocity correlation of part, calculate the required distance of water-cooled, according to this distance, a plurality of described refrigerating heads separation are defined as the refrigerating head group that might open and the refrigerating head group of not opening, with respect to this refrigerating head group that might open,, the described cooling velocity that is rolled part gives priority so that becoming near the mode of constant value.
6. coiling temperature control apparatus according to claim 5 is characterized in that,
Described when being rolled the speed that is rolled of part or batching velocity variations in described downcoiler,
Described refrigerating head priority calculating part is corresponding to the described speed that is rolled part, carry out giving the computing of priority, will export to described refrigerating head priority storage part with the priority that the described speed that is rolled part has been set up the described refrigerating head of corresponding relation to described refrigerating head.
7. coiling temperature control apparatus according to claim 6 is characterized in that,
The described control instruction portion of calculating sets up corresponding relation with described control coding with described each position that is rolled the long side direction of part and calculates, and with its output,
Described head mould formula transformation component discerned each described refrigerating head under the basis at position of the described long side direction that is rolled part on, extract the described control coding corresponding out with this position, and, extract the refrigerating head priority corresponding out according to described refrigerating head priority storage part with the current part speed that is rolled, refrigerating head priority according to this extraction, with described control transcoding, coding transform is the head mould formula, to described cooling device output.
8. coiling temperature control apparatus according to claim 7 is characterized in that,
Described control instruction is calculated portion after having calculated control instruction, judgement is under this control instruction of calculating, whether satisfy described target coiling temperature and described target cooling velocity, under the situation that does not satisfy any, change the described speed that is rolled part, carry out calculating of control instruction once more, and with its proceed to repeatedly satisfy described target coiling temperature and described target cooling velocity simultaneously till.
9. coiling temperature control apparatus according to claim 8 is characterized in that,
Described control instruction is calculated portion after having calculated control instruction, judgement is under this control instruction of calculating, whether satisfy described target coiling temperature and described target cooling velocity, when described coiling temperature is lower than described target coiling temperature, improve the described speed that is rolled part, when described coiling temperature is higher than described target coiling temperature, reduce the described speed that is rolled part, when cooling velocity is slow, on the basis of the processing that reduces the described speed that is rolled part, carry out calculating of control instruction once more, and with its proceed to repeatedly satisfy described target coiling temperature and described target cooling velocity simultaneously till.
10. reeling temperature controlling method, to cool off at the cooling device that the outlet side of this hot-rolling mill possesses by the part utilization that is rolled of hot mill rolling, the described coiling temperature that is rolled part before will being batched by downcoiler is controlled to be the target coiling temperature of regulation, described reeling temperature controlling method is characterised in that
In the mode of the desired value that satisfies the described cooling velocity that is rolled part, give priority to the opening sequence of a plurality of refrigerating heads that possess at described cooling device,
Use described priority, generating the combination that opens and closes with described refrigerating head is the corresponding control coding of each head mould formula,
According to described control coding and with the described information that is rolled the velocity correlation of part, use plate temperature to infer model, infer the described coiling temperature that is rolled part,
Use this inferred results, decision is used to realize the described control coding of described target coiling temperature and with its output,
Should control transcoding, coding transform is the head mould formula, to described cooling device output.
11. reeling temperature controlling method according to claim 10 is characterized in that,
The described temperature that is rolled part when entering according to described cooling device, with batch by described downcoiler before the target coiling temperature that is rolled part, calculate the described temperature reduction amount that is rolled part in the described cooling device, according to this temperature reduction amount and the described desired value that is rolled the cooling velocity of part, calculate the required time of cooling, according to required time of this cooling and with the described information that is rolled the velocity correlation of part, calculate the required distance of water-cooled, according to this distance, a plurality of described refrigerating heads separation are defined as the refrigerating head group that might open and the refrigerating head group of not opening, with respect to this refrigerating head group that might open, so that becoming near the mode of constant value, the described cooling velocity that is rolled part gives priority
Use this priority, generating the combination that opens and closes with described refrigerating head is the corresponding control coding of each head mould formula,
According to described control coding and with the described information that is rolled the velocity correlation of part, use described plate temperature to infer model, infer the described coiling temperature that is rolled part,
Use this inferred results, decision is used to realize the described control coding of described target coiling temperature and with its output,
Should control transcoding, coding transform is the head mould formula, to described cooling device output.
12. according to claim 10 or 11 described reeling temperature controlling methods, it is characterized in that,
A plurality of refrigerating heads with respect to described cooling device, with satisfy the described cooling velocity that is rolled part desired value opening sequence priority and describedly be rolled the speed that is rolled of part or batch in the speed of described downcoiler and set up corresponding relation and give
The combination that will open and close with described refrigerating head be that the corresponding control coding of each head mould formula is set up corresponding relation with described each position that is rolled the long side direction of part and generated,
According to described control coding and with the described information that is rolled the velocity correlation of part, use described plate temperature to infer model, infer the described coiling temperature that is rolled part,
Use this inferred results, decision is used to realize the described control coding of described target coiling temperature and with its output,
Discerned each described refrigerating head under the basis at position of the described long side direction that is rolled part on, extract the described control coding corresponding out with this position, according to that give to described refrigerating head and the corresponding priority of the current part speed that is rolled, with described control transcoding, coding transform is the head mould formula, to described cooling device output.
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