An analysis method and device for tail thickness jump of hot continuous rolling strip steel

Abstract

The application provides an analysis method and device for tail thickness jump of hot continuous rolling strip steel, and relates to the technical field of hot continuous rolling. The method comprises the following steps: collecting the tail thickness jump process data of each rack of the hot continuous rolling finishing mill; regarding the 1s before the upstream rack is thrown as the tail thickness jump stage of the downstream rack, the data sampling period is 10ms, and the same product specification data of the strip steel is classified; determining the DS side roll gap thickness jump amount, the OS side roll gap thickness jump amount, the thickness jump amount deviation of the two sides roll gap, the rolling force deviation and the strip steel temperature attenuation value; analyzing the tail thickness jump amount of the strip steel, and putting forward suggestions for the impact of the next strip steel tail thickness jump on the equipment and the yield improvement. The application is based on the continuous judgment of the calculated values of the roll gap and rolling force of each rack of the hot continuous rolling, analyzes the control adjustment strategy of the tail thickness jump amount of the strip steel, and the actual application results show that the analysis method can effectively improve the yield of the strip steel and reduce the impact on the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot continuous rolling finishing mill, in particular to an analysis method and device for tail thickness jump of hot continuous rolling strip. BACKGROUND

[0002] The rough and finishing rolling mill is the main component of the hot continuous rolling mill, and generally has one or two racks. The present application mainly refers to the finishing mill, which has seven racks, namely F1, F2, F3, F4, F5, F6 and F7 racks. In the hot continuous rolling production line, the rough and finishing rolling racks are all four-roll rolling mills, and the upper and lower supporting rollers and the upper and lower working rollers are provided. In the hot continuous rolling production process, if the tail thickness jump of the rack is large, the mechanical equipment precision and the product quality of the strip will be affected.

[0003] At present, the research on the tail thickness jump of the strip is mostly about the clearance between the equipment and the thickness of the tail of the strip, and there is almost no literature about the analysis of the tail thickness jump of the strip. SUMMARY

[0004] The present application provides an analysis method for the tail thickness jump of the hot continuous rolling strip, which can improve the rolling stability and product quality, and prevent the low mechanical equipment precision, the working roller surface indentation and the product yield caused by the tail thickness jump of the strip.

[0005] To solve the above-mentioned application purposes, the technical scheme provided by the present application is as follows: an analysis method for the tail thickness jump of the hot continuous rolling strip, comprising the following steps:

[0006] S1: collecting the tail thickness jump process data of each rack in the hot continuous rolling finishing mill, and classifying the same product data of the strip;

[0007] S2: based on the collected data, analyzing the tail DS side and OS side data of the strip;

[0008] The tail DS side and OS side data of the strip includes: the tail DS side and OS side roll gap thickness jump of the strip; the tail DS side and OS side roll gap thickness jump deviation; the rolling force deviation of the tail DS side and OS side of the strip; the roll gap recovery time of the tail DS side and OS side of the strip; and the temperature attenuation of the tail of the strip;

[0009] S3: based on the analysis results of the tail DS side and OS side data of the strip, proposing suggestions for the impact of the next tail thickness jump of the strip on the equipment and the improvement of the yield, and completing the analysis based on the tail thickness jump of the hot continuous rolling strip.

[0010] Optionally, in step S1, the tail thickness jump process data of each rack in the hot continuous rolling finishing mill is collected, which includes:

[0011] The data of the tail thickness jump process of the strip at the tail of each stand of the hot continuous rolling finishing mill is collected, starting from 1s before the strip is cast at the upstream stand, and the data sampling period is 10ms.

[0012] Optionally, in step S1, the data of the tail thickness jump process of the strip includes:

[0013] The strip product data PDI information, the measured thickness of the intermediate blank, the actual value of the FET at the entrance of the finishing mill at the tail of the intermediate blank, the falling edge of the thermal detector at the entrance of the rolling mill, the preset data of the tail casting speed, the roll gap, the loop, and the calculated value of the temperature decay of the strip tail between stands.

[0014] Optionally, in step S2, the data of the DS side and the OS side of the tail of the strip is analyzed, including:

[0015] The roll gap thickness jump amount of the DS side of the tail of the strip is determined, and the roll gap thickness jump amount of the OS side of the tail of the strip is determined.

[0016] The roll gap thickness jump amount of the DS side of the tail of the strip is calculated according to the following formula (1):

[0017] η ds =(A dm -S ds ) / S ds *100% (1)

[0018] Wherein, A dm represents the maximum actual value data of the DS side; S ds represents the roll gap set value data of the DS side, and η ds represents the roll gap thickness jump amount of the DS side.

[0019] The roll gap thickness jump amount of the OS side of the tail of the strip is calculated according to the following formula (2):

[0020] η os =(A om -S os ) / S os *100% (2)

[0021] Wherein, A om represents the maximum actual value data of the OS side, S os represents the roll gap set value data of the OS side, and η os represents the roll gap thickness jump amount of the OS side.

[0022] Optionally, in step S2, the data of the DS side and the OS side of the tail of the strip is analyzed, and further includes:

[0023] Based on the strip tail DS side roll gap thickness jump and the OS side roll gap thickness jump, the strip tail DS side roll gap thickness jump and the OS side roll gap thickness jump are calculated according to the following formula (3) to determine the thickness jump deviation of both sides of the roll gap:

[0024] η gap =η os -η ds (3)

[0025] Wherein, η os represents the OS side roll gap thickness jump, η ds represents the DS side roll gap thickness jump, and η gap represents the thickness jump deviation of both sides.

[0026] Optionally, in step S2, the analysis of the strip tail DS side and OS side data further comprises:

[0027] The rolling force deviation of the strip tail DS side and OS side is determined according to the following formula (4):

[0028] F ex =F os -F ds (4)

[0029] Wherein, F os represents the actual rolling force of the OS side, F ds represents the actual rolling force of the DS side, and F ex represents the actual rolling force deviation of both sides.

[0030] Optionally, the analysis of the strip tail DS side roll gap and OS side roll gap recovery time further comprises:

[0031] The roll gap set value is K, the error is C, and the steady state range is [K-C, K+C]. Within the error range C, the rolling can be carried out, otherwise the warning is given;

[0032] Determine the steady state time, combine all points of the DS side and OS side roll gap measured curve intersecting with straight lines K-C and K+C into a one-dimensional matrix, combine the start and end time of the sliding window in the one-dimensional matrix, sort the time corresponding values in the one-dimensional matrix, calculate the two points with the largest distance according to the numerical order, and get [t1, t2] as the steady state duration. [t0, t1] is the roll gap recovery time, i.e. the steady state time, wherein t0 represents the sliding window start time.

[0033] Optionally, the analysis of the strip tail temperature attenuation value between the stands comprises:

[0034] The rough rolling outlet strip temperature is calculated according to the following formula (5) (6):

[0035]

[0036] Q=σ(T P +T a +27310) 4 (6)

[0037] Among them, T emp T represents the average temperature of the rolled piece (°C). P T represents the surface temperature of the rolled piece (°C). a The values ​​represent: air temperature (°C), h represents the average thickness of the rolled piece (mm), c represents the specific heat capacity of the rolled piece (kJ / (kg·°C), ε represents the air-cooled radiation coefficient, and σ represents the Stephen-Boltzmann constant (W / (m²)). 2 ·℃ 4 ));

[0038] The temperature decay of the strip tail between the finishing mill stands is calculated according to the following formulas (7) and (8):

[0039]

[0040] Among them, H R The strip temperature is represented by η, the strip temperature constant is represented by ε, and the strip emissivity is represented by T. a Indicates ambient temperature;

[0041]

[0042] Among them, T w Indicates the water cooling temperature of the strip. T0 represents the cooling water flow rate of the strip frame, and T0 represents the surface temperature of the strip. The constants in the formula are empirical values.

[0043] Optionally, based on the analysis results of the DS side and OS side data of the strip tail, suggestions are made regarding the impact of the thickness jump at the tail of the next strip on the equipment and to increase production, thus completing the analysis based on the thickness jump at the tail of hot strip rolling, including:

[0044] Based on the strip tail roll gap thickness jump data, suggestions are proposed to address the impact of the next strip tail thickness jump on the equipment and to increase production, including:

[0045] When the target strip thickness is ≤4.5mm, the following judgment conditions are activated, and it is recommended to increase the tail-end speed or reduce the tail-end cooling water volume for the next strip of the same specification:

[0046]

[0047] Among them, G os This indicates the actual value of the OS side roll gap at the tail of the strip, G. ds This indicates the actual value of the roll gap on the DS side at the tail of the strip. (G)set represents the current strip tail roll gap set value, G act represents the current strip tail roll gap actual value, F tail represents the current strip tail temperature actual value, F tail represents the knowledge base optimal temperature value, R tail represents the current strip relative reduction, R his represents the knowledge base optimal relative reduction, η max represents the current strip tail average thickness jump, η his represents the knowledge base optimal tail average thickness jump;

[0048] When the strip target thickness is greater than 5mm, the following judgment condition is started, and it is recommended to increase the tail temperature or change the tail rolling of the next piece of the same product specification strip:

[0049]

[0050] wherein, α represents the current strip tail roll gap average difference, α his represents the knowledge base optimal tail roll gap difference, F tail represents the current strip tail temperature actual value, F his represents the knowledge base optimal temperature value, R tail represents the current strip relative reduction, R his represents the knowledge base optimal relative reduction, η os represents the current strip operating side tail maximum thickness jump, η hiso represents the knowledge base optimal operating side tail maximum thickness jump, η ds represents the current strip driving side tail maximum thickness jump, η hisd represents the knowledge base optimal driving side tail maximum thickness jump.

[0051] In one aspect, an analysis device based on the tail thickness jump of hot continuous rolling strip is provided, the device is applied to an electronic equipment, and the device comprises:

[0052] A data acquisition module is configured to acquire the tail thickness jump process data of each stand of the hot continuous rolling finishing mill, and classify the same product specification data of the strip;

[0053] A data analysis module is configured to analyze the tail DS side and OS side data of the strip based on the acquired data;

[0054] The tail DS side and OS side data of the strip comprises: the tail DS side and OS side roll gap thickness jump of the strip; the tail DS side and OS side roll gap thickness jump deviation of the strip; the rolling force deviation of the tail DS side and OS side of the strip; the roll gap recovery time of the tail DS side and OS side of the strip; and the tail temperature attenuation of the strip;

[0055] An analysis suggestion module is configured to propose suggestions for reducing the impact of the tail end thickness jump of the next strip on the equipment and improving the yield based on the analysis results of the DS side and OS side data of the tail end of the strip, thereby completing the analysis based on the tail end thickness jump of the hot continuous rolling strip.

[0056] In one aspect, a computer readable storage medium is provided, and the storage medium stores at least one instruction, which is loaded and executed by a processor to implement the above-mentioned analysis method based on the tail end thickness jump of the hot continuous rolling strip.

[0057] The above technical solutions of the embodiments of the present application have at least the following beneficial effects:

[0058] In the above scheme, all data of the tail end thickness jump of the roughing and finishing mill strip are collected in real time; the tail end thickness jump data collected in real time are analyzed in a primary key and auxiliary manner to provide a reference for suggestions, and the quality, process and equipment data of the next same product specification strip are adjusted to reduce factors affecting the mechanical precision and improve the rolling stability and product quality and product yield. BRIEF DESCRIPTION OF DRAWINGS

[0059] To more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0060] Figure 1 is a flowchart of the analysis method based on the tail end thickness jump of the hot continuous rolling strip provided by the embodiments of the present application;

[0061] Figure 2 is a detailed flowchart of the analysis method based on the tail end thickness jump of the hot continuous rolling strip provided by the embodiments of the present application;

[0062] Figure 3 is a F1 rack single-sided thickness jump amount DS, OS self-highest peak curve diagram of the analysis method based on the tail end thickness jump of the hot continuous rolling strip provided by the embodiments of the present application;

[0063] Figure 4 is a tail end thickness jump amount curve diagram of the analysis method based on the tail end thickness jump of the hot continuous rolling strip provided by the embodiments of the present application;

[0064] Figure 5 is a tail end temperature attenuation curve diagram of the analysis method based on the tail end thickness jump of the hot continuous rolling strip provided by the embodiments of the present application;

[0065] Figure 6 is a block diagram of the analysis device based on the tail end thickness jump of the hot continuous rolling strip provided by the embodiments of the present application;

[0066] Figure 7 is a structural schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0067] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0068] The present application provides an analysis method based on tail thickness jump of hot continuous rolling strip steel, which can be implemented by an electronic device, which can be a terminal or a server. Figure 1 As shown in the flowchart of the analysis method based on tail thickness jump of hot continuous rolling strip steel, the processing flow of the method can include the following steps:

[0069] S101: Collect the tail thickness jump process data of each stand of the hot continuous rolling finishing mill, and classify the strip steel same product specification data.

[0070] In a feasible implementation, the data collected from the tail thickness jump process of each stand of the hot continuous rolling finishing mill is collected from 1s before the upstream stand is thrown, which is regarded as the tail thickness jump stage of the downstream stand, and the data sampling period is 10ms.

[0071] In the embodiments of the present application, Kalman filtering algorithm is used to filter the data collected before the strip steel is thrown and the tail thickness jump data of the strip steel, so as to remove the interference in the data.

[0072] In a feasible implementation, the tail thickness jump process data of the strip steel includes:

[0073] The strip steel product data PDI information, the intermediate blank measured thickness, the intermediate blank tail finishing mill entrance pyrometer FET actual value, the rolling mill entrance thermal detection falling edge, the tail throwing speed of each stand, the roll gap, the preset data of the looper and the calculated value of the strip steel tail temperature attenuation between stands.

[0074] In a feasible implementation, as shown in Figure 2The application firstly collects hot continuous rolling rough rolling last pass equipment data and strip data, strip tail casting process data of each stand of finishing mill, and the previous second of the falling edge of the high temperature gauge at the entrance of the finishing mill is regarded as the thickness jump start of the tail of the strip of F1 stand, and the 500 ms before the casting of F1 is regarded as the thickness jump start of the tail of the strip of F2 stand, and so on until F7 stand, the data sampling period is 10 ms, the optimal time of all product specifications in the knowledge base is regarded as the optimal single roll data in one year, the average thickness jump amount of the tail of the strip on both sides, the maximum thickness jump amount and the average thickness jump amount of the tail on the DS side (driven side), the maximum thickness jump amount and the average thickness jump amount of the tail on the OS side (operated side), the thickness jump amount deviation on both sides of the stand, the tail temperature attenuation, the relative pressure reduction of the tail, the cooling of the tail of the strip, and finally the thickness jump amount grade of the tail of the strip is analyzed, and adjustment suggestions for the equipment, process and quality of the next piece of the same product specification strip tail thickness jump are proposed.

[0075] S102: based on the collected data, analyzing the DS side and OS side data of the tail of the strip;

[0076] The DS side and OS side data of the tail of the strip includes: the DS side and OS side roll gap thickness jump amount of the tail of the strip; the DS side and OS side roll gap thickness jump amount deviation of the tail of the strip; the rolling force deviation of the DS side and OS side of the tail of the strip; the roll gap recovery time of the DS side and OS side of the tail of the strip and the temperature attenuation of the tail of the strip.

[0077] In an available implementation, the analysis of the DS side and OS side data of the tail of the strip includes:

[0078] determining the DS side and OS side roll gap thickness jump amount of the tail of the strip;

[0079] The DS side roll gap thickness jump amount is calculated according to the following formula (1):

[0080] η ds =(A dm -S ds ) / S ds *100% (1)

[0081] Wherein, A dm represents the maximum actual value data of the DS side; S ds represents the roll gap set value data of the DS side, and η ds represents the DS side roll gap thickness jump amount.

[0082] The OS side roll gap thickness jump amount of the tail of the strip is calculated according to the following formula (2):

[0083] η os =(A om -S os ) / S os* 100% (2)

[0084] wherein, A om represents OS side maximum actual value data, S os represents OS side roll gap setting value data, η os represents OS side roll gap thickness jump.

[0085] In a feasible implementation, the analysis of the strip tail DS side and OS side data further includes:

[0086] Based on the strip tail DS side roll gap thickness jump and the OS side roll gap thickness jump, the deviation of the thickness jumps of the two sides is determined according to the following formula (3):

[0087] η gap = η os - η ds (3)

[0088] wherein, η os represents the OS side roll gap thickness jump, η ds represents the DS side roll gap thickness jump, and η gap represents the deviation of the thickness jumps of the two sides.

[0089] In a feasible implementation, according to the strip tail thickness jump data collected in real time, the strip tail thickness jump is taken as the primary key and the tail temperature is taken as the auxiliary (for example, the temperature value of 8m of the strip in front of the falling edge of the FET pyrometer is found, the data from the beginning of the strip tail thickness jump of the F1 stand to the F1 strip casting is regarded as the data from the previous second of the falling edge of the high-temperature meter at the entry of the finishing mill, and other stands are processed in the same way), the combination of the mean value method and the extreme value method is used to compare and analyze the historical optimal data of the strip tail thickness jump and the current strip tail thickness jump; wherein, the peak of the strip tail thickness jump is taken as the primary key and the temperature attenuation between the finishing stands is taken as the auxiliary primary analysis formula:

[0090]

[0091] wherein, H R represents the air cooling temperature of the strip, η represents the temperature constant of the strip, ε represents the emissivity of the strip, T represents the surface temperature of the strip, and T a represents the ambient temperature.

[0092] In a feasible implementation, according to the real-time collected tail end of the strip steel thick jump data, the tail end of the strip steel thick jump amount is taken as the primary key, and the tail end temperature is taken as the auxiliary (for example, the temperature value of the 8m strip steel forward from the falling edge start of the FET high temperature meter, and the data from the falling edge of the high temperature meter at the entrance of the finishing mill is regarded as the F1 rack tail end thick jump start to the F1 strip casting, and other racks are taken in the same way), the mean value method and the extreme value method are combined, and the current strip steel tail end thick jump data is compared and analyzed by using the historical optimal data of the strip steel tail end thick jump; wherein the average value of the tail end thick jump amount is the primary key, and the rough rolling outlet strip steel temperature is the auxiliary analysis formula:

[0093]

[0094] Wherein, η os represents the OS side tail end thick jump amount value data, η ds represents the DS side tail end thick jump amount value data, and η gap represents the average thick jump amount of the rack tail end.

[0095] In a feasible implementation, the DS side and OS side data of the tail end of the strip steel are analyzed, and further comprising:

[0096] The rolling force deviation of the DS side and OS side of the tail end of the strip steel is determined according to the following formula (4):

[0097] F ex = F os -F ds (4)

[0098] Wherein, F oｓ represents the actual rolling force of the OS side, F dｓ represents the actual rolling force of the DS side, and F eｘ represents the actual rolling force deviation of both sides.

[0099] In a feasible implementation, the DS side and OS side roll gap recovery time of the tail end of the strip steel is analyzed, and further comprising:

[0100] The roll gap setting value is K, the error is C, and the steady state range is [K-C, K+C]. The error range C can be determined by rolling, otherwise, the warning is given;

[0101] The steady state time is determined, the all points of the intersection of the DS side and OS side roll gap measured curve and the straight line K-C, K+C are combined as a one-dimensional matrix, the start and end time of the sliding window are combined in the one-dimensional matrix, the time corresponding value in the one-dimensional matrix is sorted, the two points with the largest distance are calculated according to the numerical order, and the obtained [t1, t2] is the steady state duration, then [t0, t1] is the roll gap recovery time, that is, the steady state time, wherein t0 represents the sliding window start time. For example Figure 3As shown, F1 rack one side thick jump amount DS, OS from the highest peak curve diagram, Figure 4 is the tail thick jump amount curve diagram of the present application.

[0102] In a feasible implementation, as Figure 5 As shown, the tail temperature decay curve diagram, the analysis of the temperature decay value of the strip tail between the racks includes:

[0103] According to the following formula (5) (6) to calculate the roughing outlet strip temperature,

[0104]

[0105] Q = σ (T P + T a + 27310) 4 (6)

[0106] Wherein, T emp represents the average temperature of the rolled piece (℃), T P represents the surface temperature of the rolled piece (℃), T a represents the air temperature (℃), h represents the average thickness of the rolled piece (mm), c represents the specific heat capacity of the rolled piece kJ (kg·℃), ε represents the radiation coefficient of air cooling, σ represents the Stefan-Boltzmann constant (W / (m 2 ·℃ 4 ));

[0107] In a feasible implementation, the calculation value is:

[0108]

[0109] Q = σ (T P + T a + 27310) 4 .

[0110] According to the following formula (7), (8) to calculate the temperature decay of the strip tail between the finishing racks:

[0111]

[0112] Wherein, H R represents the air cooling temperature of the strip, η represents the temperature constant of the strip, ε represents the emissivity of the strip, T represents the surface temperature of the strip, T a represents the ambient temperature;

[0113]

[0114] Wherein, T w represents the water cooling temperature of the strip, G0 represents the strip steel frame cooling water flow, T0 represents the strip steel surface temperature, and the constant in the formula is an empirical value.

[0115] S103: Based on the analysis results of the strip steel tail DS side and OS side data, suggestions for the impact of the next piece of strip steel tail thickness jump on the equipment and the improvement of the yield are proposed, and the analysis based on the hot continuous rolling strip steel tail thickness jump is completed.

[0116] In a feasible implementation, based on the analysis results of the strip steel tail DS side and OS side data, suggestions for the impact of the next piece of strip steel tail thickness jump on the equipment and the improvement of the yield are proposed, and the analysis based on the hot continuous rolling strip steel tail thickness jump is completed, including:

[0117] Based on the strip steel tail roll gap thickness jump data, suggestions for the impact of the next piece of strip steel tail thickness jump on the equipment and the improvement of the yield are proposed, wherein:

[0118] When the strip steel target thickness is ≤4.5mm, the following judgment condition is started, and it is suggested to increase the tail throwing speed or reduce the tail cooling water amount of the next piece of the same product specification strip steel:

[0119]

[0120] Wherein, G os represents the current strip steel tail OS side roll gap actual value, G ds represents the current strip steel tail DS side roll gap actual value, G set represents the current strip steel tail roll gap set value, G act represents the current strip steel tail roll gap actual value, F tail represents the current strip steel tail temperature actual value, F tail represents the knowledge base optimal temperature value, R tail represents the current strip steel relative reduction rate, R his represents the knowledge base optimal relative reduction rate, η max represents the current strip steel tail average thickness jump amount, η his represents the knowledge base optimal tail average thickness jump amount;

[0121] When the strip steel target thickness is >5mm, the following judgment condition is started, and it is suggested to increase the tail temperature or change the tail rolling of the next piece of the same product specification strip steel:

[0122]

[0123] Wherein, α represents the current strip steel tail roll gap average difference value, α his represents the knowledge base optimal tail roll gap difference value, F tail represents the current strip steel tail temperature actual value, F his represents the knowledge base optimal temperature value, R tailrepresents the current strip relative reduction, R his represents the optimal relative reduction of the knowledge base, η os represents the current strip operating side tail maximum thickness jump, η hiso represents the optimal operating side tail maximum thickness jump of the knowledge base, η ds represents the current strip drive side tail maximum thickness jump, η hisd represents the optimal drive side tail maximum thickness jump of the knowledge base.

[0124] In the embodiment, the strip tail thickness jump analysis method discussed in the present application analyzes the rough rolling last pass strip temperature, and each rack of the finishing rolling mill.

[0125] In order to verify the strip hot continuous rolling tail thickness jump-based analysis method provided in the embodiment, a determination experiment was performed on a certain 2250mm hot continuous rolling strip production line. The thickness jump data of 30 pieces of strip tail were collected, and the thickness jump data of each piece of strip was displayed on the HMI by using the determination method provided in the embodiment. The analysis result is basically consistent with the actual situation on site.

[0126] In the embodiment, all data of the strip tail thickness jump of the rough and finishing rolling mill are collected in real time. According to the real-time collected strip tail thickness jump data, the main key and auxiliary methods are used for analysis, and reference suggestions are provided. The quality, process and equipment data of the next piece of same product specification strip are adjusted to reduce the factors affecting the mechanical precision and improve the rolling stability and product quality and product yield.

[0127] Figure 6 Fig. 1 is a block diagram of a hot continuous rolling strip tail thickness jump-based analysis device according to an example embodiment. Referring to Fig. 1, the device 100 includes a data collection module 110 and a data analysis module 120. Figure 6 The device 300 includes:

[0128] The data collection module 310 is configured to collect the strip tail thickness jump process data of each rack of the hot continuous rolling finishing rolling mill, and classify the strip data of the same product specification.

[0129] The data analysis module 320 is configured to analyze the strip tail DS side and OS side data based on the collected data.

[0130] The strip tail DS side and OS side data include the strip tail DS side roll gap thickness jump and the OS side roll gap thickness jump, the strip tail DS side roll gap thickness jump and the OS side roll gap thickness jump deviation, the rolling force deviation of the strip tail DS side and the OS side, the roll gap recovery time of the strip tail DS side and the OS side, and the strip tail temperature attenuation.

[0131] The analysis suggestion module 330 is configured to propose suggestions for the impact of the next strip tail thickness jump on the equipment and the improvement of the yield based on the analysis results of the strip tail DS side and OS side data, and complete the analysis based on the hot continuous rolling strip tail thickness jump.

[0132] Optionally, the data acquisition module 310 is configured to acquire the data of the strip tail thickness jump process of each stand of the hot continuous rolling finishing mill from 1s before the upstream stand throws the strip, and the data sampling period is 10ms.

[0133] Optionally, the data acquisition module 310 is configured to

[0134] The strip product data PDI information, the intermediate blank measured thickness, the intermediate blank tail finishing mill entrance pyrometer FET actual value, the rolling mill entrance thermal detector falling edge, the tail throwing speed of each stand, the roll gap, the preset data of the looper, and the calculated value of the strip tail temperature attenuation between stands.

[0135] Optionally, the data analysis module 320 is configured to determine the strip tail DS side roll gap thickness jump amount and the OS side roll gap thickness jump amount.

[0136] The strip tail DS side roll gap thickness jump amount is calculated according to the following formula (1):

[0137] η ds =(A dm -S ds ) / S ds *100% (1)

[0138] Wherein, A dm represents the maximum actual value data of the DS side; S ds represents the roll gap set value data of the DS side, and η ds represents the DS side roll gap thickness jump amount.

[0139] The strip tail OS side roll gap thickness jump amount is calculated according to the following formula (2):

[0140] η os =(A om -S os ) / S os *100% (2)

[0141] Wherein, A om represents the maximum actual value data of the OS side, S os represents the roll gap set value data of the OS side, and η os represents the OS side roll gap thickness jump amount.

[0142] Optionally, the data analysis module 320 is configured to calculate the deviation of the roll gap thickness of the two sides of the strip tail based on the roll gap thickness jump of the DS side and the roll gap thickness jump of the OS side according to the following formula (3):

[0143] η gap = η os - η ds (3)

[0144] wherein η os represents the roll gap thickness jump of the OS side, η ds represents the roll gap thickness jump of the DS side, and η gap represents the deviation of the thickness jump of the two sides.

[0145] Optionally, the data analysis module 320 is configured to determine the rolling force deviation of the DS side and the OS side of the strip tail according to the following formula (4):

[0146] F ex = F os - F ds (4)

[0147] wherein F os represents the actual rolling force of the OS side, F ds represents the actual rolling force of the DS side, and F ex represents the deviation of the actual rolling force of the two sides.

[0148] Optionally, the data analysis module 320 is configured to analyze the recovery time of the DS side and the OS side of the strip tail roll gap, and further comprises:

[0149] determining the steady state range, and determining that the strip can be rolled within the error range C of the steady state range, otherwise, an early warning is given;

[0150] determining the steady state time, merging all points of the measured curve of the DS side and the OS side roll gap intersecting with the straight lines K-C and K+C into a one-dimensional matrix, merging the start and end time of the sliding window in the one-dimensional matrix, sorting the time corresponding values in the one-dimensional matrix, calculating the two points with the largest distance according to the numerical order, and obtaining [t1, t2] as the steady state duration, then [t0, t1] is the roll gap recovery time, i.e. the steady state time, wherein t0 represents the start time of the sliding window.

[0151] Optionally, the data analysis module 320 is configured to calculate the strip temperature at the rough rolling outlet according to the following formula (5) and (6):

[0152]

[0153] Q = σ (T P + Ta +27310) 4 (6)

[0154] wherein T emp represents the average temperature of the rolled piece (°C), T P represents the surface temperature of the rolled piece (°C), T a represents the air temperature (°C), h represents the average thickness of the rolled piece (mm), c represents the specific heat capacity of the rolled piece kJ(kg·°C), ε represents the radiation coefficient of air cooling, and σ represents the Stefan-Boltzmann constant (W / (m 2 ·°C 4 ));

[0155] The temperature decay of the strip tail between the finishing stands is calculated according to the following formulas (7) and (8):

[0156]

[0157] wherein H R represents the air cooling temperature of the strip, η represents the temperature constant of the strip, ε represents the emissivity of the strip, T represents the surface temperature of the strip, and T a represents the ambient temperature;

[0158]

[0159] wherein T w represents the water cooling temperature of the strip, represents the water flow of the strip stand, and T0 represents the surface temperature of the strip. The constant in the formula is an empirical value.

[0160] Optionally, the analysis suggestion module 330 is configured to propose a suggestion for the impact on the equipment and the yield improvement of the tail thickness jump of the next strip based on the tail thickness jump data of the strip, wherein:

[0161] When the target thickness of the strip is ≤4.5 mm, the following judgment condition is started, and it is suggested to increase the tail throwing speed or reduce the tail cooling water of the next strip of the same product specification:

[0162]

[0163] wherein G os represents the actual value of the OS side roll gap of the current strip tail, G ds represents the actual value of the DS side roll gap of the current strip tail, G set represents the set value of the roll gap of the current strip tail, G act represents the actual value of the roll gap of the current strip tail, F tail represents the actual value of the temperature of the current strip tail, F tail represents the optimal temperature value of the knowledge base, R tail represents the relative reduction of the current strip, and Rhis represents the optimal relative reduction rate of the knowledge base, η max represents the current average thickness jump of the tail of the strip, η his represents the optimal average thickness jump of the tail of the knowledge base, η

[0164] When the target thickness of the strip is greater than 5 mm, the following judgment condition is started, and it is suggested that the tail temperature of the next piece of the same product specification strip be increased or the tail rolling be changed:

[0165]

[0166] wherein, α represents the average difference of the tail roll gap of the current strip, α his represents the optimal tail roll gap difference of the knowledge base, F tail represents the actual value of the tail temperature of the current strip, F his represents the optimal temperature value of the knowledge base, R tail represents the relative reduction rate of the current strip, R his represents the optimal relative reduction rate of the knowledge base, η os represents the maximum thickness jump of the tail of the operating side of the current strip, η hiso represents the optimal maximum thickness jump of the tail of the operating side of the knowledge base, η ds represents the maximum thickness jump of the tail of the driving side of the current strip, η hisd represents the optimal maximum thickness jump of the tail of the driving side of the knowledge base.

[0167] In the embodiment of the present application, all data of the tail thickness jump of the roughing and finishing mill strip are collected in real time: the tail thickness jump data of the strip collected in real time are analyzed in a primary key and auxiliary manner to provide a reference suggestion, adjust the quality, process, and equipment data of the next piece of the same product specification strip to reduce the factors affecting the mechanical precision, and improve the rolling stability and product quality and product yield.

[0168] Figure 7 is a structural schematic diagram of an electronic device 400 provided by the embodiment of the present application. The electronic device 400 can have relatively large differences due to different configurations or performances, and can include one or more processors (central processing units, CPUs) 401 and one or more memories 402, wherein the memory 402 stores at least one instruction, the at least one instruction is loaded and executed by the processor 401 to realize the steps of the analysis method based on the tail thickness jump of the hot continuous rolling strip as follows:

[0169] S1: collecting the tail thickness jump process data of each rack of the hot continuous rolling finishing mill, and classifying the same product specification data of the strip;

[0170] S2: based on the collected data, analyzing the tail DS side and OS side data of the strip;

[0171] The strip tail DS side and OS side data includes: strip tail DS side roll gap thickness jump and OS side roll gap thickness jump; strip tail DS side roll gap thickness jump and OS side roll gap thickness jump deviation; strip tail DS side and OS side rolling force deviation; strip tail DS side and OS side roll gap recovery time and strip tail temperature decay;

[0172] S3: Based on the analysis results of the strip tail DS side and OS side data, suggestions for the impact of the next block of strip tail thickness jump on the equipment and the improvement of the yield are proposed, and the analysis based on the hot continuous rolling strip tail thickness jump is completed.

[0173] In the exemplary embodiments, a computer readable storage medium, such as a memory including instructions executable by a processor in a terminal to complete the above-mentioned analysis method based on the hot continuous rolling strip tail thickness jump is also provided. For example, the computer readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0174] Those of ordinary skill in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or by program instructions to relevant hardware, and the program can be stored in a computer readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, etc.

[0175] The above-mentioned is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An analytical method based on the thickness jump at the tail end of hot-rolled strip steel, characterized in that, Includes the following steps: S1: Collect strip thickness jump data at the tail of each stand in the hot strip mill and classify the strip data of the same specification. S2: Based on the collected data, analyze the data on the DS side and OS side of the strip tail; The data for the DS side and OS side of the strip tail include: the roll gap thickness jump on the DS side and the roll gap thickness jump on the OS side of the strip tail; the deviation between the roll gap thickness jump on the DS side and the roll gap thickness jump on the OS side of the strip tail; the rolling force deviation between the DS side and the OS side of the strip tail; the roll gap recovery time on the DS side and the OS side of the strip tail; and the temperature decay at the strip tail. S3: Based on the analysis results of the DS and OS side data of the strip tail, suggestions are made regarding the impact of the thickness jump at the tail of the next strip on the equipment and to increase production. The analysis based on the thickness jump at the tail of hot strip rolling is completed, including: Based on the data on the thickness jump at the tail of the strip roll, suggestions are made regarding the impact of the thickness jump at the tail of the next strip on the equipment and to increase production, including: When the target strip thickness is ≤4.5mm, the following judgment conditions are activated, and it is recommended to increase the tail-end speed or reduce the tail-end cooling water volume for the next strip of the same specification: ； in, This indicates the current actual value of the OS side roll gap at the tail of the strip. This indicates the actual value of the DS side roll gap at the tail of the strip. This indicates the current roll gap setting value at the tail of the strip. This indicates the current actual value of the roll gap at the tail of the strip. This indicates the actual temperature at the tail end of the strip. This represents the optimal temperature value in the knowledge base. This indicates the current relative reduction rate of the strip steel. This represents the optimal relative compression ratio of the knowledge base. This indicates the average thickness jump at the tail end of the current strip. This represents the average thickness jump at the tail of the optimal knowledge base. When the target strip thickness is greater than 5mm, the following judgment conditions are activated, and it is recommended that the tail temperature of the next strip of the same specification be increased or that the tail rolling be changed: ； in, This represents the average difference in the roll gap at the tail end of the strip. This represents the optimal tail roll gap difference value in the knowledge base. This indicates the actual temperature at the tail end of the strip. This represents the optimal temperature value in the knowledge base. This indicates the current relative reduction rate of the strip steel. This represents the optimal relative compression ratio of the knowledge base. This indicates the current thickness jump of the OS side roll gap at the tail of the strip. This represents the maximum thickness jump at the tail of the optimal operation side of the knowledge base. This indicates the current thickness jump of the DS side roll gap at the tail of the strip. This represents the maximum thickness jump at the tail end of the optimal transmission side in the knowledge base.

2. The method according to claim 1, characterized in that, In step S1, data on the thickness jump process of the strip tail at each stand in the hot strip mill are collected, including: Starting 1 second before the upstream stand throws the strip, the thickness jump stage at the tail of the downstream stand is considered. Data on the thickness jump process at the tail of the strip is collected for each stand of the hot continuous rolling mill, with a data sampling period of 10ms.

3. The method according to claim 1, characterized in that, In step S1, the data for the thickness jump process at the tail of the strip includes: The data includes strip product PDI information, measured thickness of intermediate billet, actual value of FET at the inlet of the finishing mill at the tail of intermediate billet, falling edge of the hot detection at the mill inlet, tail-throwing speed of each stand, roll gap, preset data of looper, and calculated value of temperature decay at the tail of strip between stands.

4. The method according to claim 1, characterized in that, In step S2, the data from the DS side and OS side of the strip tail are analyzed, including: Determine the thickness jump of the DS side roll gap and the thickness jump of the OS side roll gap at the tail of the strip. The thickness jump of the DS side roll gap at the tail of the strip is calculated according to the following formula (1): （1） in, This represents the maximum actual value data on the DS side; This indicates the DS side roll gap setting value data. Indicates the thickness jump of the DS side roll gap; The thickness jump of the OS side roll gap at the tail of the strip is calculated according to the following formula (2): （2） in, This represents the maximum actual value data on the OS side. This indicates the OS side roll gap setting value data. This indicates the thickness jump of the OS side roller gap.

5. The method according to claim 4, characterized in that, Step S2, which analyzes the data on the DS side and OS side of the strip tail, also includes: Based on the thickness jump of the DS side roll gap and the thickness jump of the OS side roll gap at the tail of the strip, the thickness jump of the DS side roll gap and the thickness jump of the OS side roll gap at the tail of the strip are calculated according to the following formula (3) to determine the thickness jump deviation of the roll gaps on both sides: （3） in, This indicates the thickness jump of the OS side roll gap at the tail end of the strip. This indicates the thickness jump of the DS side roll gap at the tail end of the strip. This indicates the deviation in thickness jump between the two sides.

6. The method according to claim 5, characterized in that, Step S2, which analyzes the data on the DS side and OS side of the strip tail, also includes: The rolling force deviations on the DS and OS sides of the strip tail are determined according to the following formula (4): （4） in, This indicates the actual rolling force on the OS side. This indicates the actual rolling force on the DS side. This indicates the actual deviation of the rolling force on both sides.

7. The method according to claim 5, characterized in that, The analysis of the recovery time of the DS side roll gap and OS side roll gap at the tail of the strip also includes: With the roll gap set to K, the error to C, and the steady-state range as follows: Determine the steady-state range; if the error range C is within the range, rolling can proceed; otherwise, issue a warning. Determine the steady-state time, and then compare the measured roll gap curves on the DS and OS sides with the straight line. , All intersecting points are merged into a one-dimensional matrix. The start and end times of the sliding window are then merged into this one-dimensional matrix. The time-corresponding values ​​within the one-dimensional matrix are sorted, and the points with the largest adjacent distance are calculated according to their numerical order. For the steady-state duration, then The roll gap recovery time, i.e., the steady-state time, is where... Indicates the start time of the sliding window.

8. The method according to claim 7, characterized in that, The analysis of the temperature decay value of the strip tail between the frames includes: The strip temperature at the roughing mill exit is calculated using the following formulas (5) and (6). （5） （6） in, This indicates the average temperature of the rolled piece, in °C. This indicates the surface temperature of the rolled piece, in degrees Celsius (°C). This indicates air temperature, expressed in °C. This indicates the average thickness of the rolled piece, in mm. This indicates the specific heat capacity of the rolled product, expressed in kJ / (kg·℃). This represents the Stephen-Boltzmann constant, in units of 1. ; The temperature decay of the strip tail between the finishing mill stands is calculated according to the following formulas (7) and (8): （7） in, Indicates the air cooling temperature of the strip steel. This represents the temperature constant of the strip steel. Indicates the emissivity of the strip steel. Indicates the surface temperature of the strip. Indicates ambient temperature; （8） in, Indicates the water cooling temperature of the strip. Indicates the cooling water flow rate of the strip frame. This represents the surface temperature of the strip steel, and the constants in the formula are empirical values.

9. An analytical device based on the thickness jump at the tail end of hot-rolled strip steel, characterized in that, The apparatus is suitable for the method according to any one of claims 1-8, and the apparatus comprises: The data acquisition module is used to collect data on the thickness jump process of the strip at the tail of each stand in the hot strip finishing mill and to classify the data of the same strip specification. The data analysis module is used to analyze the data on the DS side and OS side of the strip tail based on the collected data; The data for the DS side and OS side of the strip tail include: the roll gap thickness jump on the DS side and the roll gap thickness jump on the OS side of the strip tail; the deviation between the roll gap thickness jump on the DS side and the roll gap thickness jump on the OS side of the strip tail; the rolling force deviation between the DS side and the OS side of the strip tail; the roll gap recovery time on the DS side and the OS side of the strip tail; and the temperature decay at the strip tail. The analysis and suggestion module is used to propose suggestions on the impact of the thickness jump at the tail of the next strip on the equipment and to increase production based on the analysis results of the DS side and OS side data of the strip tail, thus completing the analysis based on the thickness jump at the tail of the hot strip.

Images