A method for dynamically controlling the finish rolling temperature in a finish rolling threading process

Abstract

The application discloses a kind of final-rolling temperature dynamic control method in finishing process, comprising the following steps: S1, rolling force measured value data processing;S2, calculate rolling force deviation proportion;S3, judge whether there is temperature deviation, if there is temperature deviation, then enter step S4, if there is no temperature deviation, then enter step S8;S4, calculate temperature deviation amount;S5, calculate cooling water correctable amount;S6, distribute cooling water;S7, control parameter is issued to L1 system;S8, end.The application solves the abnormal problem of strip head thickness and temperature caused by strip temperature setting deviation.

Description

TECHNICAL FIELD

[0001] The present application relates to the rolling control technology, more particularly to a kind of final rolling temperature dynamic control method in finishing rolling threading process. BACKGROUND

[0002] Generally, the hot rolling finishing rolling area is preset before the strip threading, the inter-stand cooling water and threading speed are preset, so that the strip surface temperature is consistent with the target value when the strip head exits the finishing rolling mill. After the finishing rolling threading is completed, the feedback control model takes the measured temperature of the finishing rolling outlet temperature instrument as the basis, and controls the strip full-length temperature by adjusting the inter-stand cooling water flow and rolling acceleration.

[0003] There are two kinds of existing finishing rolling temperature control methods, which are presetting and feedback control. The presetting model is completed before the finishing rolling threading, and the final rolling target temperature control is realized by adjusting the inter-stand cooling water flow and the finishing rolling strip threading speed under the premise of considering process constraints. The feedback control model participates in the control after the finishing rolling threading is completed, and the strip actual temperature is measured by the temperature measuring instrument at the finishing rolling outlet. Based on the actual temperature and the temperature difference between the strip target temperature, the inter-stand cooling water and the strip acceleration are adjusted to improve the strip temperature, so that it is consistent with the target temperature. The presetting is completed before the threading, and the feedback control participates in the control after the threading is completed. These two kinds of methods cannot control the temperature during the threading process of the finishing rolling mill, cannot reasonably utilize the actual prediction of the front stand to improve the strip head temperature control quality, and cannot provide support for thickness control optimization and rolling stability optimization. SUMMARY

[0004] In view of the above defects in the prior art, the purpose of the present application is to provide a kind of final rolling temperature dynamic control method in finishing rolling threading process, solve the strip head thickness and temperature abnormal problem caused by strip temperature setting deviation.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A kind of final rolling temperature dynamic control method in finishing rolling threading process, comprising the following steps:

[0007] S1, rolling force measured value data processing;

[0008] S2, calculate the rolling force deviation ratio;

[0009] S3, judge whether there is temperature deviation, if there is temperature deviation, then enter step S4, if there is no temperature deviation, then enter step S8;

[0010] S4, calculate the temperature deviation;

[0011] S5, calculate the cooling water correctable amount;

[0012] S6, distributing cooling water;

[0013] S7, issuing control parameters to the L1 system;

[0014] S8, ending.

[0015] Preferably, the step S1 specifically comprises:

[0016] After the strip passes through the finishing stands F1, F2 and F3, the actual measured rolling force data of the strip head is sent from the L1 system to the L2 system, and the L2 system performs basic processing on the measured data to determine whether the data is valid and to filter abnormal data.

[0017] Preferably, the measured rolling force value includes the rolling force on the working side of the rolling mill and the rolling force on the driving side of the rolling mill.

[0018] Preferably, in the step S2, the rolling force deviation proportion ΔF when the average temperature deviation amount ΔT of the strip is calculated as follows:

[0019] (1)

[0020] Conversely, the average temperature deviation amount ΔT of the strip is calculated according to the rolling force deviation proportion ΔF:

[0021] (2)

[0022] In the formulas (1) and (2), T is the average temperature calculation value of the strip preset by the L2 system, and β is a constant of the rolling force calculation model, and the value is -2-2.

[0023] Preferably, in the step S3, the determination of whether there is a temperature deviation includes:

[0024] The rolling force deviation proportion ΔF is calculated by the actual rolling force F r and the set rolling force F s .

[0025] (3)

[0026] In the formula (3), F r is the actual rolling force collected by the L1 system when the current stand passes through the strip, F s is the preset rolling force of the current stand model, and ΔF is the rolling force deviation proportion.

[0027] The rolling force deviation proportions ΔF of the finishing stands F1, F2 and F3 are calculated respectively by the formula (3), and the deviation direction is identified. According to the rolling force deviation proportion ΔF and the deviation direction, the temperature deviation amount of each stand on the rolling mill is converted, and the rolling force of each stand on the rolling mill is determined whether there is an overall deviation by weighted calculation.

[0028] When the rolling forces of the stands on the rolling mill have overall deviation, it is determined that the set temperature has deviation.

[0029] Preferably, the weighted calculation of whether the rolling forces of the stands on the rolling mill have deviation comprises:

[0030] When the deviation directions of the rolling forces of the finishing stands F1, F2 and F3 are the same, and the absolute values of the rolling force deviation proportions ΔF are all greater than the constant threshold C1, it is determined that the set rolling force has overall deviation.

[0031] When the deviation directions of the rolling forces of the finishing stands F2 and F3 are the same, and the absolute values of the rolling force deviation proportions ΔF are all greater than the constant threshold C2, it is determined that the set rolling force has overall deviation.

[0032] When the deviation directions of the rolling forces of the finishing stands F1 and F3 are the same, and the absolute values of the rolling force deviation proportions ΔF are all greater than the constant threshold C3, it is determined that the set rolling force has overall deviation.

[0033] The constant thresholds C1, C2 and C3 are in the range of 0-0.1.

[0034] Preferably, in the step S4, the temperature deviation amount is calculated as follows:

[0035] The rolling force deviation proportions ΔF of the stands are calculated using formula (3), the temperature deviation amounts of the stands are calculated using formula (2), and the temperature comprehensive correction amount ΔT of the multi-stand temperature deviation is weighted calculated. 综合 The temperature comprehensive correction amount ΔT 综合 is calculated as follows:

[0036] (4)

[0037] In formula (4), ΔT1 is the temperature deviation amount of the stand F1, ΔT2 is the temperature deviation amount of the stand F2, ΔT3 is the temperature deviation amount of the stand F3, w1 is the weight of the stand F1, w2 is the weight of the stand F2, and w3 is the weight of the stand F3.

[0038] In the calculation of the temperature deviation amount, a limiting and decaying operation is added to correct the temperature deviation amount.

[0039] (5)

[0040] In formula (5), ΔT 修正 is the corrected temperature deviation amount, and α is a decaying system. When ΔT>1, the ± in the formula takes +, and when ΔT<1, the ± in the formula takes -.

[0041] Preferably, the step S5 specifically comprises:

[0042] First, the sensitivity of the finishing temperature to the change of the cooling water flow rate of each group is calculated:

[0043] (6)

[0044] In formula (6), P is the sensitivity of water cooling, T0 is the finishing temperature before the adjustment of the cooling water flow rate, T1 is the finishing temperature after the adjustment, Q0 is the cooling water flow rate before the adjustment, and Q1 is the cooling water flow rate after the adjustment;

[0045] Using the sensitivity of the temperature to the cooling water of each group, the required amount of the temperature deviation correction to the cooling water of each group is calculated:

[0046] (7)

[0047] In formula (7), i is the cooling water number, ΔQ(i) is the flow rate required for the temperature correction of the cooling water, P(i) is the sensitivity of the temperature to the change of the cooling water flow rate of each group. i i

[0048] Preferably, the step S6 specifically comprises:

[0049] The flow rates of the inter-stand cooling water, the back spray water, the anti-peeling water, and the work roll cooling water are corrected in the order from front to back or from back to front;

[0050] According to the adjustable amount of the cooling water and the sensitivity of the cooling water, the ability of eliminating the temperature deviation of each group of cooling water is calculated, and the comprehensive temperature deviation amount is distributed to each group of cooling water according to the process priority.

[0051] Preferably, if the distribution to each group of cooling water according to the process priority still cannot meet the temperature adjustment requirement, the back spray water and the anti-peeling water are further adjusted, and finally the flow rate adjustment mode is used to control the work roll cooling water, so that the total temperature adjustment amount is consistent with the comprehensive temperature correction amount, which is specifically as follows:

[0052]

[0053] (8)

[0054] In formula (8), i is the cooling water number behind the stand, j is the back spray water number, k is the anti-peeling water number, t is the work roll cooling water number, ΔQ(i) is the flow rate adjustment amount of the i-th group of cooling water behind the stand, ΔQ(j) is the back spray water flow rate, ΔQ(k) is the anti-peeling water flow rate, and ΔFlow(t) is the work roll cooling water flow rate adjustment amount. isc anti flak wrc isc anti ​​​​​​​Sensitivity of the jth group of back spray water, P(k) flak Sensitivity of the Kth group of anti-stripping water, P(t) wrc Sensitivity of the tth group of work roll cooling water.

[0055] The application provides a finishing rolling temperature dynamic control method in a strip threading process, which fully utilizes rolling force data measured before three passes of finishing rolling, and solves abnormal phenomena of finishing rolling set temperature deviation, head thickness and rolling stability, and effectively improves head temperature, thickness control index precision and rolling stability. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 It is a flowchart of the finishing rolling temperature dynamic control method of the application;

[0057] Figure 2 It is a principle diagram of the finishing rolling temperature dynamic control method of the application. DETAILED DESCRIPTION

[0058] In order to better understand the above technical solutions of the application, the technical solutions of the application are further described below in combination with the drawings and examples.

[0059] In combination with Figure 1 and Figure 2 shown, the finishing rolling temperature dynamic control method in a strip threading process provided by the application, on the basis of the traditional control principle, increases a variety of cooling water dynamic resetting functions in the strip threading process of finishing rolling: the control system collects actual rolling force measurement data after the first three stands are threaded, comprehensively considers deviation conditions of the first three stands of the finishing rolling mill, judges deviation conditions of the rolling force set value and the actual value, calculates strip temperature prediction deviation according to the relationship between force and temperature, takes the minimum target deviation of the finishing rolling temperature as the target, dynamically adjusts the inter-stand cooling water, roll cooling water, anti-stripping water and back spray water, makes the finishing rolling temperature consistent with the preset value, and well solves problems such as thickness fluctuation and poor stability caused by inaccurate finishing rolling temperature setting. Specifically, the following steps are included:

[0060] S1, rolling force actual measurement value data processing;

[0061] After the finishing rolling F1, F2 and F3 stands are threaded, the actual measurement value of the strip head actual rolling force data is sent from the L1 system (basic automation system) to the L2 system (process control system), and the L2 system performs basic processing on the measurement data, judges whether the data is valid, and performs filtering processing on abnormal data.

[0062] The L1 system collects actual performance data: rolling force on the working side of the rolling mill and rolling force on the driving side of the rolling mill.

[0063] S2, calculating rolling force deviation proportion;

[0064] Compare the distribution of the actual rolling force of the first three stands with the set rolling force to calculate the rolling force deviation ratio of the first three stands.

[0065] S3, judge whether there is a temperature deviation, if there is a temperature deviation, go to step S4, if there is no temperature deviation, go to step S8;

[0066] According to the rolling force deviation ratio of the first three stands, it is determined whether the force has a directional deviation characteristic, if the force has a directional deviation, it is determined that the temperature setting has a deviation.

[0067] S4, calculate the temperature deviation amount;

[0068] According to the rolling force deviation direction and the deviation ratio, the temperature deviation amount of each stand is converted, and the comprehensive temperature deviation is calculated by weighting.

[0069] S5, calculate the correctable amount of cooling water;

[0070] According to the comparison between the current set flow of cooling water and the maximum and minimum flow, the adjustable space of the water is calculated.

[0071] S6, distribute the cooling water;

[0072] According to the process requirements of the production line, the cooling water, the back spray water, the anti-peeling water and the work roll cooling water flow are corrected in the order from front to back or from back to front. According to the adjustable amount of cooling water and the cooling water sensitivity, the ability of each group of cooling water to eliminate temperature deviation is calculated, and the comprehensive temperature deviation amount is distributed to each group of cooling water according to the process priority.

[0073] S7, control parameters are issued to the L1 system;

[0074] The corrected inter-stand cooling water flow, back spray water switch state, anti-peeling water switch state and work roll cooling water flow are arranged and issued to the L1 control execution.

[0075] S8, end.

[0076] The preset temperature control of the finishing mill group by the L2 system is for the head of the strip. The final rolling temperature dynamic control method fully utilizes the actual rolling force data of the head of the strip measured by the front stand, determines the setting overall deviation direction and amplitude, analyzes and quantifies the relationship between the overall rolling force deviation and the predicted temperature deviation, and realizes the final rolling temperature correction function in the strip threading process by adjusting the cooling water flow of the finishing mill group. The model principle is as follows:

[0077] (1) the relationship between temperature and rolling force:

[0078] The effect of temperature on rolling force is nonlinear, and the rolling force model is sensitive to the average temperature of the strip. When the average temperature of the strip changes by ΔT, the rolling force will deviate by a proportion of ΔF.

[0079] In step S2, the rolling force deviation proportion ΔF is calculated as follows:

[0080] (1)

[0081] Conversely, according to the rolling force deviation proportion ΔF, the average temperature deviation ΔT of the strip is calculated as follows:

[0082] (2)

[0083] In equations (1) and (2), is the calculated value of the average temperature of the strip for the L2 system, and β is a constant for the rolling force calculation model, with a value of -2 to 2.

[0084] (2) Temperature deviation judgment:

[0085] In step S3, the existence of temperature deviation is determined by:

[0086] Through the actual rolling force F r and the set rolling force F s , the rolling force deviation proportion ΔF is calculated as follows:

[0087] (3)

[0088] In equation (3), F r is the actual rolling force collected by the L1 system when the strip is being passed through the current stand, F s is the model preset rolling force for the current stand, and ΔF is the rolling force deviation proportion.

[0089] The rolling force deviation proportions ΔF of the finishing stands F1, F2, and F3 are calculated respectively by equation (3), and the deviation direction is identified. According to the rolling force deviation proportion ΔF and the deviation direction, the temperature deviation of each stand on the rolling mill is converted, and a weighted calculation is performed to determine whether there is a global deviation in the rolling force of each stand on the rolling mill.

[0090] When there is a global deviation in the rolling force of each stand on the rolling mill, it is determined that there is a deviation in the set temperature.

[0091] The weighted calculation to determine whether there is a deviation in the rolling force of each stand on the rolling mill includes:

[0092] When the rolling force deviation directions of the finishing stands F1, F2, and F3 are the same, and the absolute values of the rolling force deviation proportions ΔF are all greater than a constant threshold C1, it is determined that there is a global deviation in the set rolling force.

[0093] When the rolling force deviation directions of the finishing rolling racks F2 and F3 are the same, and the absolute values of the rolling force deviation proportions ΔF are greater than the constant threshold C2, it is determined that the set rolling force has overall deviation.

[0094] When the rolling force deviation directions of the finishing rolling racks F1 and F3 are the same, and the absolute values of the rolling force deviation proportions ΔF are greater than the constant threshold C3, it is determined that the set rolling force has overall deviation.

[0095] The constant thresholds C1, C2 and C3 are in the range of 0-0.1.

[0096] (3) Temperature deviation amount calculation:

[0097] In step S4, the temperature deviation amount is calculated as follows:

[0098] The rolling force deviation proportions ΔF of the racks are calculated by using formula (3), the temperature deviation amounts of the racks are calculated by using formula (2), the temperature comprehensive correction amount ΔT of the multi-rack temperature deviation is weighted calculated, and the temperature comprehensive correction amount ΔT is calculated as follows formula (4) for re-optimizing the temperature calculation.

[0099] (4)

[0100] In formula (4), ΔT1 is the temperature deviation amount of the rack F1, ΔT2 is the temperature deviation amount of the rack F2, ΔT3 is the temperature deviation amount of the rack F3, w1 is the weight of the rack F1, w2 is the weight of the rack F2, and w3 is the weight of the rack F3.

[0101] Since the temperature deviation is based on the rolling force deviation, the directional deviation may be misjudged, and in order to prevent over-adjustment, the limiting and attenuation operations are added in the temperature deviation amount calculation to correct the temperature deviation amount:

[0102] (5)

[0103] In formula (5), ΔT is the corrected temperature deviation amount, and α is an attenuation system. When ΔT>1, the ± in the formula takes +, and when ΔT<1, the ± in the formula takes -.

[0104] (4) Calculation of the sensitivity of the finishing temperature to the change of the cooling water flow of each group:

[0105] Step S5 specifically includes:

[0106] On the basis of the preset working conditions, the flow of each group of cooling water is adjusted in turn, the finishing temperature change amount when the flow changes ΔQ is calculated and compared, and the sensitivity of the finishing temperature to the change of the cooling water flow of each group is obtained:

[0107] (6)

[0108] In formula (6), P is the water cooling sensitivity, T0 is the finishing temperature before adjusting the cooling water flow, T1 is the finishing temperature after adjusting the cooling water flow, Q0 is the cooling water flow before adjusting, and Q1 is the cooling water flow after adjusting.

[0109] (5) Calculate the cooling water flow required for temperature deviation correction:

[0110] The finishing temperature dynamic control method adjusts the cooling water flow to correct the finishing temperature, uses the sensitivity of each group of cooling water to temperature calculated in the preset process, and calculates the amount of cooling water required for temperature deviation correction:

[0111] (7)

[0112] In formula (7), i is the cooling water number, ΔQ(i) is the flow required for temperature correction corresponding to the cooling water, P(i) is the sensitivity of temperature to the flow change of each group of cooling water. i i

[0113] (6) Cooling water distribution:

[0114] The cooling water required for temperature correction is distributed to the F3 to F7 rack area, and the available cooling water and its control mode in the area are as shown in Table 1.

[0115] Table 1 Cooling water and its control mode

[0116]

[0117] If the temperature adjustment requirement cannot be met by allocating the cooling water according to the process priority, the back spray water and the anti-peeling water are adjusted, and finally the flow adjustment mode is used to control the work roll cooling water, so that the total temperature adjustment amount is consistent with the comprehensive temperature correction amount, and the specific method is as follows:

[0118]

[0119] (8)

[0120] In formula (8), i is the cooling water number, j is the back spray water number, k is the anti-peeling water number, t is the work roll cooling water number, ΔQ(i) is the flow adjustment amount corresponding to the i th group of rack back cooling water, ΔQ(j) is the back spray water flow, ΔQ(k) is the anti-peeling water flow, and ΔFlow(t) is the work roll cooling water flow adjustment amount. isc anti flak wrc isc anti P(i) is the sensitivity of the i th group of rack back cooling water, P(j) is the sensitivity of the j th group of back spray water, and P(k) is the sensitivity of the k th group of anti-peeling water.​​​​​​​flak Sensitivity of the Kth group of anti-stripping water, P(t) wrc Sensitivity of the tth group of work roll cooling water.

[0121] Embodiment

[0122] In this embodiment, the strip steel inlet thickness is 42 mm, the strip steel outlet thickness is 5.83 mm, the strip steel speed is 8 m / s, the preset finish rolling temperature is 860℃, the maximum flow of interstand cooling water is 260 m 3 / min, and the maximum flow of work roll cooling water is 380 m 3 / min.

[0123] The preset data is as follows:

[0124]

[0125] S1, measured rolling force and data processing;

[0126] The L1 system collects the rolling force actual value of the strip steel head for 0.2s, eliminates the head 2 actual value points, removes the maximum and minimum values, and calculates the average rolling force of the remaining points.

[0127]

[0128] The L1 system returns the F1, F2, and F3 stand actual rolling forces as 21508 KN, 20522 KN, and 19001 KN, respectively.

[0129] S2, rolling force deviation calculation;

[0130] The F1, F2, and F3 stand actual rolling force deviation proportions are calculated to be 0.070635671, 0.080674039, and 0.065556303, respectively.

[0131] S3, temperature deviation judgment;

[0132] The F1, F2, and F3 stand actual rolling force deviations are in the same direction and the deviation proportions are all greater than 4%, so it is determined that the temperature has a set deviation.

[0133] S4, temperature deviation amount calculation;

[0134] The temperature deviation amounts ΔT1, ΔT2, and ΔT3 of the F1, F2, and F3 stands are calculated respectively, and the comprehensive temperature deviation amount is calculated using the weighting coefficients w1, w2, and w3 and the attenuation coefficient α.

[0135] = -16℃

[0136] The comprehensive temperature deviation is equal to -16℃ after weighting calculation of the temperature deviation quantitative values of F1, F2 and F3 stands.

[0137] S5, cooling water correctable amount calculation;

[0138] The comprehensive temperature deviation is -16℃, which indicates that the actual temperature is low, and the dynamic control model needs to reduce water. The water amount before F4 stand cannot be adjusted, and the cooling water correctable amounts of the other stands are as follows:

[0139]

[0140] S6, cooling water distribution;

[0141] According to the process requirements, the cooling water between stands is adjusted in sequence from front to back. The adjustable cooling water amount after F4 stand is 260m 3 / min, which can increase the finishing temperature by 12℃; the cooling water amount between F5 stands is adjusted to 40m 3 / min, which can decrease the water amount by 80m 3 / min and increase the finishing temperature by 4℃. After adjustment of the cooling water between two groups of stands, the comprehensive temperature deviation of -16℃ is corrected.

[0142] S7, control parameter issuing to L1 system for execution;

[0143] At this point, all calculations of the finishing temperature dynamic control model in the threading process are completed, and two groups of cooling water flow control data need to be issued to L1 for execution: the cooling water flow between F4 stands is set to 0m 3 / min, and the cooling water flow between F5 stands is set to 40m 3 / min.

[0144] As described above, the conventional online control model cannot dynamically adjust the finishing temperature control parameters in the threading process. After temperature deviation analysis in the threading process, the cooling water flow between stands is dynamically corrected in the embodiment, and the actual finishing temperature is basically consistent with the predicted value of 860℃.

Claims

1. A method of dynamically controlling finish rolling temperature in a finishing threading process, characterized by, The method comprises the following steps: S1, data processing of measured rolling force; S2, calculating rolling force deviation ratio; S3, judging whether there is temperature deviation, if there is temperature deviation, entering step S4, if there is no temperature deviation, entering step S8; S4, calculating temperature deviation amount; S5, calculating correctable amount of cooling water; S6, distributing cooling water; S7, issuing control parameters to L1 system; S8, ending, The step S1 specifically comprises: After the strip head actual rolling force data measured by L1 system is sent to L2 system, L2 system performs basic processing on the measured data to determine whether the data is valid, and performs filtering processing on abnormal data, The measured rolling force comprises rolling force on the working side of the rolling mill and rolling force on the driving side of the rolling mill, In the step S2, the rolling force deviation ratio ΔF when the average temperature deviation amount ΔT of the strip is calculated as follows: （1） Conversely, according to the rolling force deviation ratio ΔF, the average temperature deviation amount ΔT of the strip is calculated as follows: （2） In formula (1) and (2), T is the average temperature calculation value of the strip preset by L2 system, and β is the rolling force calculation model constant, and the value is-2-2.

2. The method of dynamically controlling the finish rolling temperature during finish rolling threading according to claim 1, wherein In the step S3, whether there is temperature deviation comprises: By actual rolling force F r With the set rolling force F s The rolling force deviation ratio ΔF is calculated: （3） In formula (3), F r F is the actual rolling force collected by the L1 system during the current stand threading, and s F is the preset rolling force of the current stand model, and ΔF is the deviation ratio of the actual rolling force and the set rolling force. The rolling force deviation ratios ΔF of the finishing rolling F1, F2 and F3 racks are calculated respectively through formula (3), and the deviation direction is identified, the temperature deviation amount of each rack on the rolling mill is converted according to the rolling force deviation ratio ΔF and the deviation direction, and the rolling force of each rack on the rolling mill is judged whether there is overall deviation by weighted calculation; When the rolling force of each rack on the rolling mill appears overall deviation, it is determined that the set temperature exists deviation.

3. The method of dynamically controlling the finish rolling temperature during the finishing rolling process according to claim 2, wherein The weighted calculation of whether the rolling force of each rack on the rolling mill exists deviation comprises: When the rolling force deviation directions of the finishing rolling F1, F2 and F3 racks are the same, and the absolute values of the rolling force deviation ratios ΔF are all greater than the constant threshold C1, it is determined that the set rolling force exists overall deviation; When the rolling force deviation directions of the finishing rolling F2 and F3 racks are the same, and the absolute values of the rolling force deviation ratios ΔF are all greater than the constant threshold C2, it is determined that the set rolling force exists overall deviation; When the rolling force deviation directions of the finishing rolling F1 and F3 racks are the same, and the absolute values of the rolling force deviation ratios ΔF are all greater than the constant threshold C3, it is determined that the set rolling force exists overall deviation; The constant thresholds C1, C2 and C3 are in the range of 0-0.

1.

4. The method for dynamic control of final rolling temperature during the finishing rolling process according to claim 2, characterized in that, In the step S4, the temperature deviation amount is calculated as follows: The rolling force deviation proportion ΔF of each stand is calculated using formula (3), and the temperature deviation amount of each stand is calculated using formula (2), and the temperature comprehensive correction amount ΔT is calculated by weighted calculation of the temperature deviations of the multiple stands 综合 The temperature comprehensive correction amount ΔT 综合 is calculated as follows: （4） In formula (4), ΔT1 is the temperature deviation amount of F1 rack, ΔT2 is the temperature deviation amount of F2 rack, ΔT3 is the temperature deviation amount of F3 rack, w1 is the weight of F1 rack, w2 is the weight of F2 rack, and w3 is the weight of F3 rack; When the temperature deviation amount is calculated, the limiting and attenuation operations are added to correct the temperature deviation amount: （5） In formula (5), ΔT 修正 is the corrected temperature deviation amount, and α is an attenuation system. When ΔT > 1, the ± in the formula takes the + sign, and when ΔT < 1, the ± in the formula takes the - sign.

5. The method for dynamic control of final rolling temperature during the finishing rolling process according to claim 4, characterized in that, The step S5 specifically comprises: First, the sensitivity of the finishing temperature to the change of the cooling water flow of each group is calculated: （6） In formula (6), P is the water cooling sensitivity, T0 is the finishing temperature before the cooling water flow is adjusted, T1 is the finishing temperature after the cooling water flow is adjusted, Q0 is the cooling water flow before the cooling water flow is adjusted, and Q1 is the cooling water flow after the cooling water flow is adjusted; The temperature deviation correction requirement for the single cooling water group is calculated using the sensitivity of each cooling water group to temperature: （7） In Equation (7), i is the cooling water number, ΔQ i is the flow rate required for temperature correction of the cooling water, P i is the sensitivity of the temperature to the flow rate change of each group of cooling water.

6. The method of dynamically controlling the finish rolling temperature during finish rolling threading according to claim 5, wherein The step S6 specifically includes: The flow of inter-stand cooling water, back spray water, anti-stripping water and work roll cooling water is corrected in the order from front to back or from back to front; The ability of each cooling water group to eliminate temperature deviation is calculated according to the adjustable amount of cooling water and the sensitivity of cooling water, and the comprehensive temperature deviation amount is allocated to each cooling water group according to the process priority.

7. The method of dynamically controlling the finish rolling temperature during the finishing rolling of a strip according to claim 6, wherein If the allocation of each cooling water group according to the process priority still cannot meet the temperature adjustment requirement, the back spray water and the anti-stripping water are adjusted, and finally the flow adjustment mode is used to control the work roll cooling water, so that the total temperature adjustment amount is consistent with the comprehensive temperature correction amount, specifically as follows: （8） In formula (8), i is the number of the back cooling water of the housing, j is the number of the reverse spray water, k is the number of the anti-stripping water, t is the number of the work roll cooling water, ΔQ(i) isc is the flow adjustment amount of the i-th group of back cooling water of the housing, ΔQ(i) anti is the flow of the reverse spray water, ΔQ(k) flak is the flow of the anti-stripping water, ΔFlow(t) wrc is the flow adjustment amount of the work roll cooling water, P(i) isc is the sensitivity of the i-th group of back cooling water of the housing, P(i) anti is the sensitivity of the j-th group of reverse spray water, P(k) flak is the sensitivity of the k-th group of anti-stripping water, P(t) wrc is the sensitivity of the t-th group of work roll cooling water.

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