TWI324949B - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cooling control method, a cooling control device, a cooling water amount calculation device, a computer program, and a recording medium in a steel plate manufacturing program, and particularly relates to a suitable one. It is used in the technique of cooling the steel sheet immediately after rolling. [Prior Art 3] Heretofore, a cooling control method has been proposed which measures the temperature of a steel sheet in a cooling operation, varies the amount of cooling water sprayed on and under the steel sheet so that the cooling end temperature is a desired temperature, and corrects the steel sheet. The difference between the upper temperature and the lower temperature is to prevent the shape of the steel sheet from being deformed by the difference between the upper temperature of the steel sheet and the lower temperature (for example, refer to Japanese Patent Publication No. Hei 7-41303). In the cooling method described in JP-A-60-210313, the upper and lower ratios of the amount of cooling water are determined by coefficients determined by the size of the material to be cooled, and the temperature of the steel sheet during cooling and the amount of cooling water and heat are determined. The transfer coefficient has a great relationship, that is, the aforementioned heat transfer coefficient is a function of the surface temperature of the steel sheet. Therefore, since the temperature state of the steel sheet at the start of cooling differs depending on the respective cooling targets, and the surface temperature of the steel sheet during cooling changes at all times, the change in the heat transfer coefficient due to the above causes cannot be accurately reflected in Cooling water volume. Therefore, it is impossible to prevent the shape of the steel sheet from being deteriorated with high precision by merely determining the upper and lower ratio of the amount of water. In order to solve the above problem, the cooling method of 5 1324949 described in Japanese Patent Publication No. Hei 7-29139 is to predict the temperature at the start of cooling at the end of rolling, and calculate the time using the heat transfer equation in which the calculation result is the initial state. The surface temperature state and the heat transfer coefficient which are constantly changing are used, whereby the ratio of the amount of water which can suppress the deterioration of the shape of the steel sheet during cooling can be determined with high precision. However, as described above, since the heat transfer coefficient greatly affects the temperature of the steel sheet at the start of cooling, the cooling described in Japanese Patent Publication No. 7-29139, which is based on the prediction of the cooling start temperature at the end of rolling, is used. The method is affected by various disturbances in the interval from the end of rolling to the start of cooling. Therefore, since the amount of water up-and-down ratio at the end of rolling is also included, there are many errors. Therefore, the problem of the cooling method of Japanese Patent Publication No. 7-29139 is limited in the effect of suppressing the deterioration of the shape of the steel sheet. For this reason, the method of cooling the method of the method of the above-mentioned Japanese Patent Publication No. Hei. No. Hei. Calculate the cooling water ratio by the actual measurement result of the thermometer set at the cooling start position, and use the heat transfer equation considering the surface temperature state and the heat transfer coefficient which are always changing, and try to calculate the ratio of the upper and lower temperature distributions to a certain amount of water. .

According to the cooling method of the above-mentioned Japanese Patent Publication No. Hei 2-70018, it is possible to obtain the upper-lower ratio of the water amount with high accuracy. However, the cooling method is obtained by searching for the heat transfer equation repeatedly. The amount of cooling water is 6 1324949, so it will make the calculation amount shameful. It takes a lot of time until the result is calculated. If there is a delay in starting the water injection after the junction plate enters the cooling device, == :: before the cooling device Stop-state straight, so there is difficulty in implementation. In view of the foregoing problems, the present invention aims to cool the steel sheet to a pre-cooled end temperature, and to quickly control the handle from the cold (four) to the top I::: water X' with the same precision to prevent the upper and lower The shape of the steel sheet caused by the difference in cooling rate is deformed. The cooling control method of the present invention is to cool the steel plate after the cold rolling by cooling the farmer. The cooling (four) green includes a step of setting the cooling schedule, and the remaining data is set on the thermometer of the inlet side of the cooling device. The value 'calculates the cooling conditions required to cool the temperature of the steel sheet through the inside of the cooling device to a predetermined temperature in the plural position inside the cooling device, and determines the cooling schedule; the heat transfer coefficient calculation step is The temperature of the predetermined cooling schedule set by the predetermined cooling schedule setting step, and (4) the ith cooling fire heavy duty of cooling the cooling water of the steel sheet to calculate the heat transfer coefficient indicating the ease of heat conduction; The ratio calculating step is to calculate the second cooling water amount density of the cooling water for cooling the opposite side of the steel sheet from the heat transfer coefficient calculated by the heat transfer coefficient calculating step, and calculate the first cooling water amount density and the foregoing 2 the upper limit of the cooling water volume density; and the cooling water amount control step is calculated according to the foregoing upper and lower ratio calculation steps In the lower ratio, the amount of cooling water for cooling the steel sheet passing through the inside of the cooling device is controlled. β 7 1324949 Further, the cooling control device of the present invention cools the steel sheet which has been delayed by the cooling device, and the cooling control device includes: The predetermined cooling schedule setting means is configured to calculate, based on the measured value of the thermometer provided on the inlet side of the cooling device, the temperature at the time when the steel sheet passes through the inside of the cooling device to a predetermined temperature in the plurality of positions inside the cooling device a required cooling condition and setting a predetermined cooling schedule; the heat transfer coefficient calculating means is a temperature of a predetermined cooling schedule set by the predetermined cooling schedule setting means, and cooling water for cooling one of the steel plates The first cooling water amount density 'calculates the heat transfer coefficient showing the ease of heat conduction; the upper and lower ratio calculating means can calculate the heat transfer coefficient calculated by the heat transfer coefficient calculating means to calculate the heat of the steel plate The second cooling water amount density of the opposite cooling water, and calculating the aforementioned second cooling water amount density The second cooling water density ratio by the vertical; and a cooling water control means, based on the calculated ratio may be up and down according to the up and down by said ratio calculating means, the control plate can be cooled by internal cooling of the cooling water by means of. Further, the cooling water amount calculating device of the present invention can calculate the amount of cooling water required to cool the rolled steel sheet by cooling, and the cooling water level calculating device includes: a predetermined cooling schedule setting mechanism, which can be a measurement value of a thermometer provided on an entry side of the cooling device, calculating a cooling condition required to measure a temperature at which the steel sheet is cooled to a predetermined temperature through the inside of the cooling device, and setting a predetermined cooling schedule; a heat transfer coefficient calculating mechanism Calculating the ease of displaying heat conduction from the temperature of the pre-cooling shirt schedule set by the predetermined cooling schedule setting mechanism and the first cold heading water density for cooling the cooling water of the steel sheet. The heat of the 8 1324949 pass coefficient; and the upper and lower ratio calculation mechanism, the heat transfer coefficient calculated by the heat transfer coefficient meter nose mechanism can be used to calculate the second cooling water amount capable of cooling the opposite surface of the sodium plate The density is calculated by comparing the first cooling water weight with the second cooling water amount density. Further, the computer program of the present invention allows the computer to execute the cooling control method as described above. Further, the recording medium of the present invention is recorded as the aforementioned computer program. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a steel sheet manufacturing line according to a first embodiment of the present invention. FIG. 2 is a view showing an internal configuration example of a cooling device according to a first embodiment of the present invention. . Fig. 3 is a block diagram showing a schematic configuration example of a control system including a cooling water amount calculation device in the first embodiment of the present invention. Fig. 4 is a flow chart showing an example of a procedure for determining the amount of cooling water by the cooling water amount calculating device according to the first embodiment of the present invention. Fig. 5 is a view showing the relationship between the inside temperature of the steel sheet and the heat transfer coefficient of the lower portion in the first embodiment of the present invention. Fig. 6 is a view showing the relationship between the surface temperature of the steel sheet and the upper heat transfer coefficient in the first embodiment of the present invention. Fig. 7 is a view showing the temperature distribution at 11 o'clock in the thickness direction. Figure 8 is a diagram showing the position of the steel plate passing through the cooling device. Fig. 9 is a view showing a method of detecting the upper water amount density in the first embodiment of the present invention. 9

BEST MODE FOR CARRYING OUT THE INVENTION (First embodiment) The cooling temperature transition in the first embodiment of the present invention is a flowchart showing an example of the steps of the upper-to-lower ratio calculation unit according to the first embodiment of the present invention. Hereinafter, the best mode of the present invention will be described with reference to the state of the present invention. Fig. 1 shows an example of a steel sheet manufacturing line using the present invention. In order, there are: finishing rolling calender 2, which can be used as shown in Figure 1 of the female 1 Stop the ancients: pick up * annoying? The steel plate 1 which is roughly formed by a heating furnace or a rough rolling calender which has not been shown is calendered to a target plate thickness; the machine 3' is capable of being strong (four) extended steel plate 1 shape, and the cooling device 4, If the steel sheet is accelerated and cooled by the front of the system, the steel sheet which has been accelerated and cooled can be made into a product having a desired shape and material. A finishing rolling front thermometer 5 is disposed on the input side of the finish rolling calender 2, and a finishing rolling output side thermometer 6 is disposed on the output side. Further, on the entry side of the cooling device 4, a cooling wheel side thermometer 7 is disposed. In the present embodiment, each thermometer can measure the temperatures above and below the steel sheet 1. Fig. 2 is a view showing an example of the internal configuration of the non-cooling device 4. In the inside of the cooling device 4, a plurality of roller groups 41 in which a plurality of steel sheets are transported are disposed, and in each of the cooling regions 1 to 19, a nozzle group in which a plurality of sprayable cooling waters are arranged is disposed above and below the steel sheet (not Graphic). The cooling water sprayed from the nozzle group can control the flow rate by the flow control valve, and the number of zones or the injection amount of each nozzle can be lightly used depending on conditions such as the thickness of the steel plate or the length of the plate. In the present embodiment, the cooling input side thermometer 7 is disposed on the input side of the cooling device 4. Fig. 3 is a block diagram showing a schematic outline of a control unit including a cooling water amount calculating device 1 of the present embodiment. In the cooling water amount calculation device 1A, the calendering control device 200 is connected, and the calendering machine containing the finishing rolling calender 2 can be performed (4); the production management device_, the county is required to carry out the production manager; The device can display various materials outputted by the cooling water amount calculating device 1GG, or the cooling water amount calculating device outputs the input from the operator, and the cooling input side thermometer 7. Further, in the cooling water amount calculation device 100, the cooling water amount control device 500 is connected, and the cooling water amount control device 5 controls the flow rate control valve 5〇1 of each of the cooling zones 1Z to 19Z of the cooling device 4 to control the amount of cooling water. . That is, the cooling water calculation device can perform the cooling water amount control device based on the data input by the cooling input side thermometer 7, the rolling control operation 2GG, the production management device 3 () (), and the # material input/output device gamma. Calculation of the amount of cooling water controlled by 500. In particular, the cooling water amount calculation device 1 of the present embodiment can transmit the information on the amount of cooling water required for the cooling water amount control device 500 by transferring the steel sheet i after the finish rolling rolling, and can determine the cooling device. * The amount of water injected. More specifically, the cooling water amount calculation device 1 of the present embodiment includes a predetermined cooling schedule setting unit 101 that sets a predetermined cooling schedule of the steel sheet 1 of the cooling device 4 in response to the target cooling end temperature information. ; heat transmission system 11 1324949 number calculation unit 1〇2' system can obtain the middle wheel of the cooling device 4! The heat transfer coefficient of the predetermined portion; and the upper/lower ratio calculating unit 1 () 3 can be obtained from the heat transfer coefficient calculating unit 102 based on the predetermined cooling schedule set by the predetermined cold head scheduling setting unit 101. The heat transfer system and the number are calculated to reflect the water density ratio above and below the agricultural water 500 in the amount of cooling water. Fig. 4 is a flow chart showing an example of a procedure for determining the amount of cooling water by the calculation of the amount of cooling water in the present embodiment. In step S401, the predetermined cooling schedule setting unit 1〇1 sets a predetermined cooling schedule of the cooling device 4 with respect to the steel sheet 1. Specifically, the surface temperature of the steel sheet as measured by the cooling input side thermometer 7 was measured, and the temperature distribution in the thickness direction of each of the sections at the time before the cooling of the row was determined. It is known that the temperature distribution in the thickness direction is the parabola having the highest temperature in the middle of the thickness direction. Further, the method of obtaining the temperature distribution in the thickness direction from the surface temperature can be determined by using the method disclosed in Japanese Patent Publication No. Hei 7-413-3, for example, and determining the temperature distribution in the thickness direction U (see Fig. 7). If the outline is clear, the upper surface temperature TF is the measured temperature, and the temperature difference AT between the upper surface and the highest temperature of the plate is calculated by the following equation. AT = 33.8-3.63h ( -0.0371 + 0.00528h) . TF··. ( i) △T : temperature difference between the upper surface and the highest temperature of the plate temperature, h : plate thickness. The lower surface temperature TL is calculated according to the following formula (2). TL = TF + K^(^TScon+ATSclass) (2) ξ : Temperature conversion coefficient obtained by learning, ATs: temperature difference between the upper and lower sides of the input side obtained by learning, K, and I: determined by the adjustment factor. Determine the parabolic temperature distribution that satisfies the above conditions and determine the 12 1324949 temperature distribution in the thickness direction. 'Set the plate of each zone at the time of cooling 为 as the initial value'. According to the required control accuracy, the plate is clothed to an appropriate length (for example, (4)). (4) The temperature at which the calculation target is cut into = but the cooling start position is = difference = the average thickness field Tsk* (hereinafter referred to as "cooling start temperature" 1 is the thickness direction = number) of each zone of the cooling start position of the different cooling unit 4 as the cooling start temperature information. Regarding the method of analyzing the temperature transition by solving the heat transfer difference equation, as disclosed in, for example, Japanese Patent Publication No. 7-4(10), the outline is as follows, according to the initial temperature distribution state in the thickness direction, the representative point on the board is 丨The defect point is calculated as a calculation target point by the primary heat transfer difference equation shown by the following equation (3). (1) t+, =Q(j)t+At . (λ) + i — 2Xj+Xj. i )/ρ · Δχ2. :! ~11) △Qs = 4.88[[(Tg + 273)/100]4 - [(Τ(1) + 273)/1 〇〇]4 ](j = i ,ll) = 0(j = 2~10)...( 3) Q(1)t : calorific value of element j at time t, T(j): indicates isothermal, At: fixed time of differential calculation (=const, 150msec), p: density, χ: heat transfer rate of element j, Tg : Temperature, AQS: Boundary condition, Δχ: Thickness of plate thickness. At this time, when the plate temperature Τ is converted into the heat Q, if Τ > 880, then Q = 3.333 + 0.16T, and if TS880, then Q = - 149.05 + 0.481 · -1.68 χ 1 (Γ4· T2 ; When the temperature is Τ (including heat: the value of the specific heat from 〇 ° C to Τ integration), if Q > 144.13, then Τ = -20.8 + 6.25xQ, if 0 < QS144.13 ' then 1 = 1431.5 - / ( 1.162x106—5.95χ 13 1324949 i〇3xQ) ° Then, the predetermined cooling schedule setting unit 101 calculates the passage time (TMz) and the cooling predicted temperature (Tsk) of each zone based on the cooling passage speed ' of each zone (12 to 192). Here, the cooling prediction temperature (Tsk) is as shown in Fig. 1 and shows the input side temperature of each region divided into several parts. x+Lzone dx V(x) Cooling speed According to the method described in Japanese Patent Publication No. 7_4, the position of the front end of the steel plate and the transport speed of the dragon group are obtained. As shown in Fig. 8, the position of the front end of the steel plate is taken as the χ, and the conveyance speed at this time is v. (x), the plate is now at the point of the cooling device population, in other words, the water cooling time at a point X from the front end of the steel plate. · t(x) = j* J ί Cooling time tt Next, the water tm and tb of the front end, the center, and the end portion are obtained by the following equation.

Lzone V(x) dx r L/2+^z〇ne 1 j· L+Cc 1 J. (5) L: plate length, V(x)=l/(ax2+bx + c), · out a, b, c. Using the above formula 3, find a =

iTw2(tt+tb_2t J '+tb'2tm)} 14 1324949 Acceleration bracketing (defined area of X) depends on the following formula. L4- lzone+ A1c2 L : plate length ' lzone : effective cooling zone length, : (co-complex = const) 作 By substituting 'the appropriate X in the predetermined acceleration range, substituting V(x), create The position of the front end of the steel plate and the transfer group at this point (speed mode). Then, the aforementioned calculation result is output to the passing speed control means (not shown). The acceleration rate is determined as described above. When the steel sheet is cooled while being conveyed, the time at which the front end portion and the end portion of the steel sheet enter the cooling device 4 is different. That is, since the cooling start temperature varies depending on the longitudinal direction of the steel sheet, the temperature at which the front end portion and the end portion are cooled may be different, so that the temperature of each product material can be uniform across the entire length, by The correction is made by advancing toward the distal end portion and accelerating the passage speed of the steel sheet. The cooling schedule can be paid up to the cooling end target temperature by the above. Then, in step S402, the heat transfer coefficient calculating unit 1〇2 selects the reference water amount density corresponding to the calculation target zone Z from each zone reference water amount density, and substitutes the cooling lower water amount density (WDLi). Here, the method of determining the reference water density of each zone can be determined by, for example, a value transmitted by a commercial computer as shown in Japanese Patent Publication No. 7-41303. Then, in step S403, the heat transfer coefficient calculating unit 1〇2 takes the cooling predicted temperature (Tsk) as an initial value, performs heat transfer difference calculation, and calculates the inner surface temperature (TLi) of the steel sheet. Here, the Tsk value of the initial repeated operation of the area 1Z is "cold 15 1324949 but the temperature Tsk* is started", and the result of the repeated operation calculation other than the value is Tsk. Then, the lower heat transfer coefficient (aLi) was determined from the difference between the cooled lower water density (WDLi) and the inside temperature of the steel sheet (TLi). Regarding the temperature inside the steel sheet (TU), for example, the special fair No. 7-41303, which is described above, can be calculated by j=ii. Fig. 1 is a characteristic diagram showing the cooling temperature transition of this embodiment. As shown in Fig. 10, the inside temperature of the steel sheet (TLi) indicates, for example, the temperature inside the input side in which the inside of the area ι is repeatedly operated. When the inside temperature (TLi) of the steel sheet is calculated, the cooling predicted temperature (Tsk) is taken as the initial value, and the heat transfer differential calculation is performed. The calculation of the inside temperature of the steel sheet (TLi) is performed by each of the repeated operations. The method for calculating the lower heat transfer coefficient (aLi) will be described in detail later with reference to Fig. 5. In general, the heat transfer coefficient (4) is a nonlinear function determined by the water amount density WD (m3/m2. minute) and the surface temperature Ts, and various equations have been proposed. For example, the following formula is proposed.

Log(a) = A + B * Log ( WD ) +C*TS+D* · *(4) Since the heat transfer coefficient (a) differs depending on the boiling state of the water, the formula (4) The coefficients A, B, C, and D are generally as follows, and the coefficients of the above formula (4) are respectively subjected to coefficients at surface temperatures.

Ts^Kl-^-Al ' B1 > Cl ' D1 Ts <K1->A2 ' B2 ' C2 ' D2 And 'Because the upper surface and the lower surface generally produce a difference in the state of cooling water retention, the coefficients are respectively It is a general rule. Therefore, using the example of the basic formula of the above (4), the heat transfer coefficient is calculated using the following coefficient sets, respectively. For example, the coefficient for calculating the upper heat transfer coefficient is: 16 1324949

Tsu = Klu—^-Alu ' Blu ' Clu ' Dlu

Ts u < Klu — A2u, B2u, C2u, D2u. Further, the coefficients for calculating the lower heat transfer coefficient are: TSL2K1L4A1L, B1L, C1L, D1L,

Tsl <KIl - ^ A2l, B2l, C2l, D2l. Based on the foregoing ideas, description will be made in Fig. 5. Fig. 5 is a characteristic diagram showing the relationship between the inside temperature of the steel sheet and the heat transfer coefficient of the lower portion in the present embodiment. In Fig. 5, a graph showing the relationship between the temperature inside the steel sheet and the heat transfer coefficient at WDLi = 0.3, 0.8, and 2.0 is shown. For example, when WDLi = 0.8, if the value of the temperature inside the steel sheet (TLi) is calculated, the Y coordinate (txLi) corresponding to the coordinates 501 of the curve of WDLi = 0.8 can be obtained. Further, when a complex curve pattern differing depending on the number of cooling lower water density (WDLi) is stored in advance, and the calculated cooling pattern of the lower water density (WDLi) is not memorized, the curve of the closest value is used. Therefore, in order to improve the calculation accuracy, it is desirable to memorize more curved patterns. Next, in step S404, the up-and-down ratio calculating unit 103 calculates the cooling upper water amount (WDUi) using the lower heat transfer coefficient (aLi) calculated in step S403, and calculates the appropriate up-and-down ratio (ηί) of the above-described repeated calculation, and then, The calculation method of the cooling upper water amount density (WDUi) will be described with reference to Fig. 6. Fig. 6 is a view showing the relationship between the steel sheet surface temperature (TUi) and the upper heat transfer coefficient (txUi) in this embodiment. 17 1324949 In the present embodiment, 'exploring the curve through the steel sheet surface temperature (TUi) = steel plate inner temperature (TLi), upper heat transfer coefficient (aUi) = lower heat transfer coefficient (aLi) coordinate 601 and obtaining the upper portion of the cooling Water volume density (WDUi). The cooling water volume density (WDLi)-like pattern also has a curve pattern of a plurality of cooling upper water density (WDUi), but when the corresponding curve pattern is not memorized, the cooling upper water density (WDUi) is directly calculated. Next, the calculation method of the cooling upper water amount density (WDUi) will be described with reference to Fig. 9 and Fig. 11'. As shown in Fig. 9, the cooling water volume density (WDU) is changed while the upper heat transfer coefficient (aUi) is the same as the lower heat transfer coefficient (aDU). Fig. 11 is a flow chart showing the procedure of the upper and lower ratio calculating unit 103 for calculating the upper water amount density (WDUi) in the present embodiment. In step SU01, it is determined whether or not the upper standard heat transfer coefficient (called) coincides with the lower heat transfer coefficient (aLi). Here, the upper standard heat transfer coefficient (e.g.,) means a non-reference surface heat transfer coefficient corresponding to the standard water amount density (WDU*), which is calculated by the above formula (4). Also, the standard water volume density (WDU*) is used as information in advance. If the judgment result is the same, if WDUi=WDU*, the calculation ends. On the other hand, if the determination result in step S1101 does not match, it is determined in step SU02 whether or not the upper standard heat transfer coefficient (aQ) is larger than the lower heat transfer coefficient (aU). If the upper standard heat transfer coefficient (called) is greater than the lower heat transfer coefficient (aLi) ^^, the above judgment result jumps to the step si 1〇6. On the other hand, the step $ Η. If the upper standard heat transfer coefficient (aQ) is smaller than the lower heat transfer coefficient 18 1324949, the process proceeds to step S1103. Next, in step S1103, k is added to advance from step S1102, and =0), and '^〇!; 1 (+1=\¥〇1; 1{+4\¥|^3 0) is calculated. Here, ' 〇 〇 1; 14 and ΔW^ : Δ Wk = | WDUk - WDUk., I /2 ( 1 ) > WDU. = WDU·, Δ\ν0=^ (S: fixed number). Next, in step S1104, it is determined whether or not the heat transfer coefficient (ak+1) corresponding to WDUk+1 and the lower heat transfer coefficient (aLi) calculated in step S1103 are equal. If the result of the determination is identical, then in step S1105, it is determined whether or not the heat transfer coefficient (〇tk+1) calculated above is greater than the lower heat transfer coefficient (aLi). If the heat transfer coefficient (ak+|) calculated as described above is smaller than the lower heat transfer coefficient (aLi), the process returns to step S1103, and 1 is added to k, and the same calculation is performed again. On the other hand, when the result of the determination in step 811〇5 is that the above (ak+1) is larger than the above (aLi), the process proceeds to step s11〇6. Then, in step S1106, 1 is added for k (k = 0 is set from the step S1102), and WDUk+1 = WDUk - AWk is calculated. Next, in step su〇7, it is determined whether the heat transfer coefficient (ak+1) corresponding to WDUk+i calculated in step S1106 is equal to aLi, and when the determination result is identical, WDUi=WDUk+1' End the calculation. On the other hand, when the result of the step 叩〇7 is not determined, it is judged in the step SUQ8 whether or not it is smaller than aLi. When the result of the foregoing determination is the aforementioned calculated heat transfer coefficient (called +〇 is greater than the aforementioned lower heat transfer Wei (aLi), the returning jump _6, for the value k additional 卜再-人进仃 is also calculated. If the determination in step 51 (10) is 19, the result is as follows (ak + lw, in the case of (aLi), then proceed to step sm f at the value = add 1 ' again to perform the same calculation. As described above, until the description The difference between the heat transfer coefficient (ak+i) and the lower heat transfer coefficient (4) is calculated in turn. In addition, in the present embodiment, when the cooling device 4 starts to cool, the steel plate surface temperature is inside the oil plate. The temperature is roughly _ premise, = steel plate surface temperature (10)), and the inside temperature (TLi) of the plate is calculated. However, for example, in the stage before the cooling device 4 performs cooling, the heat transfer difference equation is sometimes calculated by calculation. An error occurs between the surface temperature of the steel sheet and the temperature inside the steel sheet. At this time, in order to calculate the heat transfer difference equation for the region lz, the heat transfer difference equation is calculated and fine-tuned, and the above-calculated values can also be used. Upper water volume Degree (WDUi), and the appropriate up-and-down ratio of the reverse operation is calculated. The appropriate up-and-down ratio (ηί) is rji=WDUi/WDLi. Next, in step S405, the upper-lower ratio calculation unit 1〇3 determines the repetitive operation with respect to one area. When the determination result is not completed, the process returns to step S403, and the calculation is repeated again. On the other hand, if the result of the determination in step S405 is completed, the process proceeds to the next step S4〇6. The order can be arbitrarily set, but when the elapsed time (ETM) is multiplied by the repetitive operation time (TM*) and the elapsed time (ETM) is calculated, the number of repeated operations is usually determined so that ΕΤΜ>ΤΜζ. Next, in step S406, the ratio is up and down. The calculation unit 103 calculates an average value (ΑνΕ(ηί)) of the appropriate upper-lower ratio (ηί) of each repeated operation, and sets the average value as an area up to the ratio of 20 1324949 (nζ). Then, in step S407, The heat transfer coefficient calculation unit 102 determines whether or not the next region is not calculated. When the foregoing determination result indicates that there is a next region, the process returns to step S402, and the calculation is performed again to calculate the next region. The area of the domain is appropriately up-and-down ratio (η〇. On the other hand, when the result of the determination in step S407 is that there is no next region, the foregoing step to the next step S408. When all the regions are properly up-and-down compared to the end of the calculation, the amount of cooling water The calculation device 100 transmits the data of the appropriate up-and-down ratio (ηζ) to all the areas to the cooling water amount control device 500, and the cooling water amount control device 500 adjusts the flow rate control valve 501 of the cooling device 4 based on the above-described data to cause the cooling water to flow to the respective nozzles. Therefore, in the present embodiment, the cooling water of all the regions can be made to flow out before the front end portion of the steel sheet 1 enters the cooling device 4. In step S408, the predetermined cooling schedule setting unit 101 determines whether or not the portion of the temperature measured by the cooling-inside side thermometer 7 is the end portion of the steel sheet 1. When the result of the above determination is the end portion of the steel sheet 1, the entire treatment is terminated. On the other hand, if the result of the determination in step S408 is that the end portion of the non-steel sheet 1 is not returned to step S401', a new cooling schedule is obtained for the lower portion of the steel sheet 1. As described above, in order to make the material of the entire length of the steel sheet 1 uniform, the speed of the steel sheet is increased toward the end portion. Therefore, the cold portion schedule of the steel sheet 1 differs depending on the position of the steel sheet 1. Therefore, in the present embodiment, the steel sheet 1 can be divided into a plurality of portions', and a cooling schedule can be obtained for each portion. In the present embodiment, since the upper water amount density (WDUi) and the cooling lower water amount density (WDLi) are determined as described above, it is possible to simplify the cooling of the 21 1324949 steel sheet 1 to a predetermined cooling end temperature, The calculation required for the amount of cooling water sprayed from the upper and lower sides; 1J before the end portion of the cold plate device 4 into the cooling device 4, +

19Z J circulates cooling water in all areas, and the deterioration of the shape of the steel sheet can be suppressed to the most (other embodiments of the present invention). Specifically, the calculation of the amount of cooling water of the above-described embodiment I ^ includes CPU, U.S., R Computer Devices or, therefore, in order to implement the various functional processes of the present invention, the computer program itself that is attached to a computer is also within the scope of the present invention. Further, the foregoing embodiments are merely illustrative of the embodiments of the present invention. The technical scope of the present invention is not limited by the foregoing description. That is, the present invention can be realized without departing from the technical idea of the present invention or its main features. According to the present invention, in accordance with the present invention, the steel sheet is passed through the inside of the cooling device by the plurality of positions inside the cooling device based on the measured value of the thermometer provided on the inlet side of the cooling device. The cooling condition required for the temperature to be cooled to a predetermined temperature, and setting a predetermined cooling schedule, pulling the temperature from the predetermined cooling schedule set, and the first cooling water amount density of the cooling water capable of cooling one surface of the steel sheet Calculating a heat transfer coefficient indicating the ease of heat conduction, and calculating a second cooling water amount density of the cooling water on the reverse side of the steel sheet from the heat transfer coefficient calculated as described above, and then based on the first cooling water amount density and The above-mentioned second cooling water amount density is controlled by the amount of cooling water 22 1324949 which can cool the steel sheet passing through the inside of the cooling device, so that it is necessary to control the injection self-cooling device in order to cool the steel sheet to a predetermined cooling end temperature. The amount of calculation required for the amount of cooling water below. As a result, the time required to obtain the desired calculation result can be greatly shortened, so that the period from the temperature measurement of the steel sheet to the actual start of cooling to soil can be significantly shortened. Therefore, the thermometer on the entry side can be placed directly in front of the above-described cooling device, and a cooling process in which the amount of water up and down is less than the error can be achieved, and deformation of the shape of the steel sheet can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an example of a steel sheet manufacturing line according to a first embodiment of the present invention. Fig. 2 is a view showing an example of the internal configuration of a cooling device in the first embodiment of the present invention. Fig. 3 is a block diagram showing a schematic configuration example of a control system including a cooling water amount calculation device in the first embodiment of the present invention. Fig. 4 is a flow chart showing an example of a procedure for determining the amount of cooling water by the cooling water amount calculating means of the second embodiment of the present invention. Fig. 5 is a view showing the relationship between the inside temperature of the steel sheet and the heat transfer coefficient of the lower portion in the first embodiment of the present invention. Fig. 6 is a view showing the relationship between the surface temperature of the steel sheet and the upper heat transfer coefficient in the first embodiment of the present invention. Figure 7 is a graph showing the temperature distribution at 11 o'clock in the 7F plate thickness direction. Figure 8 is a diagram showing the position of the steel plate passing through the cooling device. Fig. 9 is a view showing a method of detecting the upper water amount density in the first embodiment of the present invention. 23 1324949 Fig. 10 is a characteristic diagram showing an example of the cooling temperature transition in the first embodiment of the present invention. Fig. 11 is a flow chart showing an example of the procedure of calculating the upper water amount by the upper portion of the first embodiment of the present invention. [Description of main component symbols] 1...Steel plate 100... Cooling water amount calculation device 2: Finish rolling calender 101...Predetermined cooling schedule setting unit 3··· Bridge subtraction 102... Heat transfer coefficient calculation unit 4...Cooling device 103...Upper/down ratio calculating unit 5: Finishing rolling front thermometer 200: Rolling control device 6: Fine Li L output side thermometer 300... Production management device 7... Cooling input side thermometer 400... Data input/output device 41.. 500... Cooling water quantity control device 1Ζ~19Ζ...Cooling area 501...Flow control valve 24

Claims (1)

1324949 Application No. 96126342 Application for Patent Replacing This amendment date is October 10, 1998, and the scope of application for patents: 1. A cooling control method is a cooling device that cools a steel plate after rolling, which is characterized by There is: a pre-cooling schedule setting step of cooling the temperature of the steel sheet through the inside of the cooling device to a predetermined value based on a measured value of a thermometer provided on an inlet side of the cooling device a cooling condition required for the temperature and setting a predetermined cooling schedule; a heat transfer coefficient calculating step of cooling the predetermined cooling schedule set from the predetermined cooling schedule setting step and cooling the surface of the steel sheet The first cooling water amount density of water is calculated as a heat transfer coefficient indicating the ease of heat conduction; the upper and lower ratio calculating step is calculated from the heat transfer coefficient calculated by the heat transfer coefficient calculating step, and is used to calculate the heat transfer coefficient The second cooling water amount density of the reverse cooling water, and calculating the first cooling water volume density And the second cooling water density ratio by the vertical; and cooling water control step, according to the uplink based on the calculated ratio of the bottom ratio calculated by Step 'by controlling the amount of water for cooling the inside of the steel plate cooled by the cooling device. 2. The cooling control method according to claim 1, wherein the first cooling water amount density is used to cool a cooling water amount density of the cooling water on the lower side of the steel sheet, and the second cooling water amount density is used to cool the steel sheet. The amount of cooling water in the upper side of the cooling water. 25 1324949 3. The cooling control method according to claim 1, wherein the upper and lower ratio calculating step calculates the cooling water amount at a plurality of positions inside the cooling device according to a cooling schedule set by the predetermined cooling schedule setting step. The ratio of density to the top and bottom. 4. The cooling control method according to claim 2, wherein the foregoing upper and lower ratio calculation step calculates the cooling water amount density at a plurality of positions inside the cooling device according to the cooling schedule set by the predetermined cooling schedule setting step. Up and down ratio. 5. The cooling control method according to any one of claims 1 to 4, wherein the first cooling water rush is determined based on a cooling schedule set in the predetermined cooling schedule setting step. 6. A type of cooling control device that cools a steel plate that has just been rolled by a cooling device, and includes: a predetermined cooling schedule setting mechanism' that is based on a measurement of a thermometer provided on the cooling shock entering side a value for calculating a cooling condition required to cool the temperature of the steel sheet through the inside of the cooling device to a predetermined temperature and setting a predetermined cooling schedule for the plurality of positions inside the cooling device; and a heat transfer coefficient calculating mechanism Calculating a heat transfer coefficient indicating the ease of heat conduction from the temperature of the predetermined cooling schedule set by the predetermined cooling schedule setting means and the first cooling water amount density of the cooling water of the surface of the front plate; The upper and lower ratio calculating means calculates the second cooling water amount density of 26 χ 324949 cooling water for cooling the opposite side of the steel sheet from the heat transfer coefficient calculated by the heat transfer coefficient calculating means, and calculates the first cooling water amount The density is compared with the above-mentioned second cooling water amount density; and the cooling water amount control mechanism is based on The computer calculated the ratio of said upper and lower than the vertical configuration, by controlling the steel sheet to cool the inner portion of the cooling water by the cooling device. 7. The cooling control device according to claim 6 wherein the first cooling water amount density is used to cool the cooling water amount density of the cooling water on the lower side of the steel sheet, and the second cooling water amount density is used to cool the steel sheet. The amount of cooling water in the upper side of the cooling water. 8. The cooling control device according to claim 6, wherein the upper and lower ratio calculating means can calculate the cooling water amount density at a plurality of positions inside the cooling device according to the cooling schedule set by the predetermined cooling schedule setting mechanism. Up and down ratio. 9. The cooling control device according to claim 7, wherein the upper and lower ratio calculating means calculates the cooling water amount density at a plurality of positions inside the cooling device according to a cooling schedule set by the predetermined cooling schedule setting mechanism. Up and down ratio. 10. The cooling control device according to any one of claims 6 to 9, wherein the first cooling water amount density is determined based on a cooling schedule set by the predetermined cooling schedule setting means. 11. A cooling water amount calculating device for calculating a cooling water amount required for cooling a steel plate which has just been rolled by a cooling device, characterized in that it comprises: 27 1324949 a predetermined cooling schedule setting mechanism, which is set according to The weight measurement value of the thermometer on the entry side of the cooling device calculates the cooling condition required to cool the temperature of the steel sheet through the inside of the cooling device to a predetermined temperature and sets a predetermined cooling schedule for the plurality of positions inside the cooling device. The heat transfer coefficient calculating means calculates the heat conduction from the temperature of the predetermined cooling schedule set by the predetermined cooling schedule setting means and the first cooling water amount density for cooling the cooling water on one side of the steel sheet. The heat transfer coefficient of the ease of use; and the upper and lower ratio calculation mechanism, the heat transfer coefficient from the heat transfer coefficient calculation mechanism, and the second cooling water amount for cooling the reverse surface cooling water of the steel plate Density, and calculating the ratio of the aforementioned second cooling water amount to the above second cooling water amount density. The computer program is a system for causing a computer to execute the cooling control method according to any one of items 1 to 5 of the aforementioned patent application. A computer-readable recording medium recorded by a computer program as in the foregoing item 12. . 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