Sickle camber adjusting method based on rough rolling bending value and finish rolling wedge-shaped data

Abstract

The invention discloses a camber adjusting method based on a rough rolling bending value and finish rolling wedge-shaped data. According to the camber adjusting method, camber deformation of a plate blank is adjusted by controlling the hydraulic rolling reduction of a four-roller rough rolling machine in the rough rolling process; an infrared width gauge is arranged at the position 5-10 m away from an outlet of the roughing mill. A finish rolling outlet multifunctional instrument is arranged at an outlet of the finish rolling machine and can detect wedge-shaped data of the strip steel; according to the method, the plate blank can be adaptively adjusted according to the rough rolling bending value and the finish rolling wedge-shaped data of the previous plate blank, so that the camber deformation of the plate blank is avoided as far as possible.

Description

Technical Field

[0001] The present invention relates to a camber adjustment method based on rough rolling camber value and finishing rolling wedge data, and in particular to a method capable of adjusting the camber deformation of a slab according to rough rolling camber data and finishing rolling wedge data, belonging to the technical field of slab camber adjustment equipment. Background Art

[0002] During the hot rolling rough rolling process, the slab will bend due to asymmetric factors, commonly known as sickle bend. Excessive sickle bend will cause poor plate shape problems and even lead to production accidents, damage equipment and cause abnormal shutdowns, resulting in economic losses. Therefore, in each pass of rough rolling, the sickle bend of the slab needs to be adjusted by pressing down and tilting the roll gap of the rolling mill. When the bent slab enters the next pass of rolling, the position where it enters the rolling mill deviates from the rolling center line, so it is necessary to accurately calculate the roll gap leveling value for adjustment to avoid a larger sickle bend. At present, the rough rolling process of the hot rolling production line of the rough rolling part is only equipped with one rough rolling mill, and the rough rolling outlet layout is used to adjust the roll gap leveling value. A width gauge installed in the device detects the bending of the slab; Patent CN200710036563.6 discloses a method of using a side guide plate to tighten the slab through pressure to improve the sickle shape of the rough rolling, but does not consider the influence of the existing sickle on the rolling process; Patent CN201811554734.9 discloses a sickle control method based on a rough rolling mill entrance and exit detection device, and does not consider the subsequent influence on the finishing stage; The above-mentioned comparative patents do not combine the rough rolling and finishing rolling parameters to accurately adjust the sickle, so a method that can accurately adjust the sickle of the slab is needed. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a sickle bend adjustment method based on rough rolling bend value and finishing rolling wedge shape data, which can adaptively adjust the current slab according to the rough rolling bend value and finishing rolling wedge shape data of the previous slab, thereby avoiding the sickle bend deformation of the slab as much as possible.

[0004] The problem described in the present invention is solved by the following technical solutions:

[0005] A sickle adjustment method based on rough rolling bending value and finishing rolling wedge data,

[0006] The present invention adjusts the sickle deformation of the slab by controlling the hydraulic pressure reduction of the four-roll roughing mill in the roughing process; an infrared width measuring instrument is arranged at 5m-10m from the roughing mill outlet; a finishing mill outlet multifunctional instrument is arranged at the finishing mill outlet to detect the wedge data of the strip;

[0007] The adjustment method includes the following steps:

[0008] S1: The first pass of slab rolling is adjusted based on:

[0009] The bending value of the sickle elbow is measured by the width gauge at the rolling exit of this pass, and the leveling value of the first pass of the next slab is adjusted according to the bending value of the sickle elbow of the first pass of the slab rolled this time; the present invention only adjusts the hydraulic cylinder on the operating side of the roll, that is, the OS side, and the pressing value of the OS side of the roll is ΔS n1 ;

[0010] S2: Starting from the second rolling pass, the adjustment basis for subsequent even-numbered passes is as follows:

[0011] S21: According to the bending value of the tail of the sickle bend measured by the width gauge at the exit of the previous rolling pass, the leveling value of the strip in this pass is adjusted. The base value of the pressure reduction value in the i-th pass is ΔS i ;

[0012] S22: According to the rolling force deviation on both sides of the current rolling pass, the next piece of steel is adjusted in the same pass, and the rolling force deviation head mean and body mean are calculated. The rolling force deviation measured by the rolling mill pressure sensor is the rolling force OS-DS value. The head mean minus the body mean is taken as the rolling force deviation variation. According to the rolling force deviation variation, the roll gap leveling value is adjusted according to ΔS ni Make adjustments;

[0013] Starting from the second rolling pass, the adjustment values ​​of the subsequent even-numbered passes are superimposed on the original reference values, and the superimposed values ​​are as follows: ΔS of S21 i ΔS of the same pass S22 as the previous slab ni The data and, that is, ΔS i +ΔS ni ;

[0014] S23: Determine the current pass leveling value, that is, the current pass ΔS i Same pass as the previous slab ΔS ni The sum of the values ​​is different from the first pass leveling value. If the difference is less than 20% of the maximum allowable adjustment of the roll gap leveling, S2 is leveled according to ΔS i +ΔS ni Implementation; if the difference value exceeds 20% of the allowable adjustment amount of the roll gap leveling, the leveling value in step S2 is the sum of the leveling value of S1 and 20% of the maximum allowable adjustment amount of the roll gap leveling;

[0015] S3: The adjustment basis for odd-numbered passes starting from the third rolling pass is:

[0016] S31: Adjustment is performed based on the tail mean and body mean of the rolling force deviation of the previous pass, wherein the tail mean is the last 10% of the slab length, and the body mean is the 30% to 70% of the length; the measured rolling force deviation is set as the rolling force OS-DS value, and the tail mean minus the body mean is taken as the rolling force deviation variation. The roll gap base leveling value is adjusted according to the calculated value of step S22, and the calculated value is ΔK ni ;

[0017] S32: According to the bending value of the sickle elbow measured by the width gauge at the rolling exit of this pass, the leveling value of the next strip in the same pass is adjusted, and the adjustment is performed according to the value calculated by the method in step S21. The adjustment value is ΔK i ;

[0018] Therefore, the initial adjustment value of the odd-numbered passes starting from the third pass of rolling is superimposed on the original reference value, and the superimposed value is as follows: The calculated value of this pass ΔK ni Calculated value ΔK of the same pass as the previous slab i The sum of ΔK ni +ΔK i ;

[0019] S33: Determine the current pass leveling value, that is, the current pass ΔK ni Same pass as the previous slab ΔK i The sum of the values ​​is different from the first pass leveling value. If the difference is less than 20% of the maximum allowable adjustment of the roll gap leveling, then S3 is leveled according to ΔK ni +ΔK i Implementation; if the difference value exceeds 20% of the allowable adjustment amount of the roll gap leveling, the leveling value in step S3 is the sum of the leveling value of S1 and 20% of the maximum allowable adjustment amount of the roll gap leveling;

[0020] S4: The condition for whether this step is implemented is that the bending amount of the slab measured by the width gauge after the 1st / 3rd / 5th rolling of the previous slab is completed is less than C0, and the C0 value is determined according to the quality control regulations for slab bending at the industrial site; if the condition is met, this step is implemented, otherwise this step is not implemented;

[0021] This step is:

[0022] Continuously roll m pieces of strip steel (usually m>2 pieces), and calculate the average value w of the full length of the wedge measured at the finish rolling exit of each roll fish ;w fish is the thickness value of the operating side minus the transmission side; if w fish If the value exceeds the preset target value continuously, the adjustment amount of each pass of the next slab rough rolling will increase by ΔS. ni value.

[0023] The above-mentioned sickle adjustment method based on rough rolling bending value and finishing rolling wedge shape data, in step S1, its ΔS n1 The expanded form is as follows:

[0024]

[0025] Among them, H1 is the setting value of the rolling thickness of the current pass of rough rolling; B max is the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the influence coefficient of steel grade, which is related to the lateral flow characteristics of the slab material and takes the value [0,2]; C is the bending value at 5m of the slab head measured by the exit width gauge, in mm.

[0026] The above-mentioned sickle adjustment method based on rough rolling bending value and finishing rolling wedge shape data, in step S21, its ΔS i The expanded form is as follows:

[0027]

[0028] Among them, H i B is the setting value of the rolling thickness of the current rough rolling pass; max is the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the steel grade influence coefficient, with a value of [0,2]; C is the head bending value measured at the outlet, in mm.

[0029] The above-mentioned sickle adjustment method based on rough rolling bending value and finishing rolling wedge shape data, in step S22, its ΔS ni The expanded form is as follows:

[0030]

[0031] Among them, H i B is the setting value of the rolling thickness of the current rough rolling pass; max is the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the steel grade influence coefficient, with a value of [0,2]; ΔF i It is the rolling force deviation change, unit is KN.

[0032] The above-mentioned sickle adjustment method based on rough rolling bending value and finishing rolling wedge shape data, in step S4, its ΔS ni The expanded form is as follows:

[0033]

[0034] Wherein, Hi is the setting value of the rolling thickness of the current pass of rough rolling, and hi is the setting value of the thickness of the finishing outlet strip, in mm.

[0035] The present invention can realize the automatic leveling control of the roughing mill in the conventional hot rolling roughing process under the condition that a width gauge is originally equipped at the roughing mill outlet and a finishing mill outlet multifunctional instrument is installed at the finishing mill outlet, thereby effectively improving the quality of the sickle bending of the roughing intermediate billet, and the proportion of the slab bending amount meeting ±30mm can be increased by more than 15% compared with before the implementation of the present technology. DETAILED DESCRIPTION

[0036] The present invention adjusts the sickle deformation of the slab by controlling the hydraulic pressure reduction of the four-roll roughing mill in the roughing process; an infrared width meter is arranged at 5m-10m from the roughing mill outlet; a finishing mill outlet multifunctional instrument is arranged at the finishing mill outlet to detect the wedge data of the strip, and the finishing mill outlet multifunctional instrument is a common device for measuring the wedge data of the strip; the present invention controls the sickle of the intermediate slab during re-rolling by the roughing mill.

[0037] The adjustment method includes the following steps:

[0038] S1: The first pass of slab rolling is adjusted based on:

[0039] The bending value of the sickle elbow is measured by the width gauge at the rolling exit of this pass, and the leveling value of the first pass of the next slab is adjusted according to the bending value of the sickle elbow of the first pass of the slab rolled this time; the present invention only adjusts the hydraulic cylinder on the operating side of the roll, that is, the OS side, and the pressing value of the OS side of the roll is ΔS n1 ;

[0040] S2: Starting from the second rolling pass, the adjustment basis for subsequent even-numbered passes is as follows:

[0041] S21: According to the bending value of the tail of the sickle bend measured by the width gauge at the exit of the previous rolling pass, the leveling value of the strip in this pass is adjusted. The base value of the pressure reduction value in the i-th pass is ΔS i ;

[0042] S22: According to the rolling force deviation on both sides of the current rolling pass, the next piece of steel is adjusted in the same pass, and the rolling force deviation head mean and body mean are calculated. The rolling force deviation measured by the rolling mill pressure sensor is the rolling force OS-DS value. The head mean minus the body mean is taken as the rolling force deviation variation. According to the rolling force deviation variation, the roll gap leveling value is adjusted according to ΔS ni Make adjustments;

[0043] Starting from the second rolling pass, the adjustment values ​​of the subsequent even-numbered passes are superimposed on the original reference values, and the superimposed values ​​are as follows: ΔS of S21 i ΔS of the same pass S22 as the previous slab ni The data and, that is, ΔS i +ΔS ni ;

[0044] S23: Determine the current pass leveling value, that is, the current pass ΔS i Same pass as the previous slab ΔS ni The sum of the values ​​is different from the first pass leveling value. If the difference is less than 20% of the maximum allowable adjustment of the roll gap leveling, S2 is leveled according to ΔS i +ΔS ni Implementation; if the difference value exceeds 20% of the allowable adjustment amount of the roll gap leveling, the leveling value in step S2 is the sum of the leveling value of S1 and 20% of the maximum allowable adjustment amount of the roll gap leveling;

[0045] S3: The adjustment basis for odd-numbered passes starting from the third rolling pass is:

[0046] S31: Adjustment is performed based on the tail mean and body mean of the rolling force deviation of the previous pass, wherein the tail mean is the last 10% of the slab length, and the body mean is the 30% to 70% of the length; the measured rolling force deviation is set as the rolling force OS-DS value, and the tail mean minus the body mean is taken as the rolling force deviation variation. The roll gap base leveling value is adjusted according to the calculated value of step S22, and the calculated value is ΔK ni ;

[0047] S32: According to the bending value of the sickle elbow measured by the width gauge at the rolling exit of this pass, the leveling value of the next strip in the same pass is adjusted, and the adjustment is performed according to the value calculated by the method in step S21. The adjustment value is ΔK i ;

[0048] Therefore, the initial adjustment value of the odd-numbered passes starting from the third pass of rolling is superimposed on the original reference value, and the superimposed value is as follows: The calculated value of this pass ΔK ni Calculated value ΔK of the same pass as the previous slab i The sum of ΔK ni +ΔK i ;

[0049] S33: Determine the current pass leveling value, that is, the current pass ΔK ni Same pass as the previous slab ΔK i The sum of the values ​​is different from the first pass leveling value. If the difference is less than 20% of the maximum allowable adjustment of the roll gap leveling, then S3 is leveled according to ΔK ni +ΔK i Implementation; if the difference value exceeds 20% of the allowable adjustment amount of the roll gap leveling, the leveling value in step S3 is the sum of the leveling value of S1 and 20% of the maximum allowable adjustment amount of the roll gap leveling;

[0050] S4: The condition for whether this step is implemented is that the bending amount of the slab measured by the width gauge after the 1st / 3rd / 5th rolling of the previous slab is completed is less than C0, and the C0 value is determined according to the quality control regulations for slab bending at the industrial site; if the condition is met, this step is implemented, otherwise this step is not implemented;

[0051] This step is:

[0052] Continuously roll m pieces of strip steel (usually m>2 pieces), and calculate the average value w of the full length of the wedge measured at the finish rolling exit of each roll fish ;w fish is the thickness value of the operating side minus the transmission side; if w fish If the value exceeds the preset target value continuously, the adjustment amount of each pass of the next slab rough rolling will increase by ΔS. ni value.

[0053] In step S1, ΔS n1 The expanded form is as follows:

[0054]

[0055] Among them, H1 is the setting value of the rolling thickness of the current pass of rough rolling; B max is the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the influence coefficient of steel grade, which is related to the lateral flow characteristics of the slab material and takes the value [0,2]; C is the bending value at 5m of the slab head measured by the exit width gauge, in mm.

[0056] In step S21, ΔS i The expanded form is as follows:

[0057]

[0058] Among them, H i B is the setting value of the rolling thickness of the current rough rolling pass; max is the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the steel grade influence coefficient, with a value of [0,2]; C is the head bending value measured at the outlet, in mm.

[0059] In step S22, ΔS ni The expanded form is as follows:

[0060]

[0061] Among them, H i B is the setting value of the rolling thickness of the current rough rolling pass; maxis the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the steel grade influence coefficient, with a value of [0,2]; ΔF i It is the rolling force deviation change, unit is KN.

[0062] In step S4, ΔS ni The expanded form is as follows:

[0063]

[0064] Wherein, Hi is the setting value of the rolling thickness of the current pass of rough rolling, and hi is the setting value of the thickness of the finishing outlet strip, in mm.

[0065] Embodiment 1:

[0066] Take the 1250-line rough rolling mill of a certain factory as an example, the rolling steel grade is Q235, the width is 1100mm, and the rough rolling is 5 passes;

[0067] Equipped with a four-high roughing mill with hydraulic pressure to control the sickle bending of the intermediate billet during reciprocating rolling;

[0068] The adjustment basis for the first rolling pass is: adjust the first pass leveling value of the next strip according to the bending value of the sickle elbow measured by the width gauge at the rolling exit of this pass.

[0069] Then the pressure value ΔS n1 Adjust according to the following formula:

[0070]

[0071] Among them, the setting value of the rolling thickness of the current rough rolling pass is 120mm; the maximum width of the strip rolled by the production line is 1200mm; the width of the current rolled strip is 1100mm; the influence coefficient of Q235 steel grade is 0.8; the head bending value measured at the exit of this pass is 30mm;

[0072] The adjustment basis for the even-numbered passes starting from the second rolling pass is:

[0073] According to the bending value of the tail of the sickle bend measured by the width gauge at the rolling exit of the previous pass, the leveling value of the strip in this pass is adjusted, and the pressing value ΔS2 of the second pass is adjusted according to the following formula:

[0074]

[0075] Among them, the current rough rolling pass rolling thickness setting value is 72mm; C is the head bending value measured at the exit, 30mm;

[0076] According to the rolling force deviation on both sides of the current rolling pass of the previous steel, the current steel is adjusted in the same pass, and the rolling force deviation head mean (usually the average of the values ​​measured in the first 10% of the slab length) and body mean (usually the average of the values ​​measured in the 30% to 70% of the slab length) are calculated. The rolling force deviation measured by the rolling mill pressure sensor is the rolling force OS-DS value (which can be read in the automation system). The head mean minus the body mean is taken as the rolling force deviation change. According to the rolling force deviation change, the roll gap leveling value is calculated according to ΔS n2 Make adjustments;

[0077]

[0078] Among them, the setting value of the rolling thickness of the current rough rolling pass is 72mm; the deviation change of the rolling force of the upper steel second pass is -9KN;

[0079] Then the second leveling value is ΔS2+ΔS n2 =0.047+0.141=0.188mm, whether the difference between the second pass leveling value and the first pass leveling value exceeds 20% of the allowable adjustment amount of the roll gap leveling, the calculated value in step S2 is 0.188mm; if the difference between the current pass leveling value and the second pass leveling value is less than 20% of the maximum allowable value of 2mm for the roughing roll gap adjustment, then the leveling value of this pass is 0.188mm.

[0080] The adjustment basis for odd-numbered rolling passes starting from the third rolling pass is:

[0081] The adjustment is calculated based on the tail mean (usually the last 10% of the length) and the body mean (usually the 30% to 70% of the length) of the rolling force deviation of the previous pass. Assuming that the measured rolling force deviation is the value of the rolling force OS-DS, the tail mean minus the body mean is taken as the rolling force deviation variation. The roll gap leveling value is adjusted based on the pressure reduction / rolling force deviation variation according to the calculated value according to the method of step S22.

[0082]

[0083] Among them, the rolling thickness setting value of the current rough rolling pass is 48mm; the variation of the rolling force deviation of the second pass of this steel is -7KN;

[0084] According to the bending value of the sickle elbow measured by the width gauge at the rolling exit of this pass, the leveling value of the next strip in the same pass is adjusted, and the pressing down / bending is adjusted according to the value calculated by the method in step S21;

[0085]

[0086] Among them, the setting value of the rolling thickness of the current rough rolling pass is 48mm; C is the head bending value measured at the exit of the upper steel block after three passes, 25mm;

[0087] Then the third leveling value is ΔK3+ΔK n3 =0.073+0.052=0.125mm. It is judged that the difference between the third pass leveling value and the first pass leveling value cannot exceed 20% of the allowable adjustment amount of the roller gap leveling. If it exceeds, 20% is added to the first pass leveling basis; if the third pass adjustment amount does not exceed the difference between the third pass leveling value and the first pass leveling value, it cannot exceed 20% of the allowable adjustment amount of the roller gap leveling, then the leveling value of this pass is 0.125mm.

[0088] Continuously roll three strips and calculate the average value w of the full length of the wedge measured at the finish rolling exit of each roll fish (thickness value of the operating side minus the transmission side), which are 0.017, 0.016, and 0.018 mm respectively. If the target value is exceeded by 0.015 mm continuously, the leveling amount of the first pass of the rough rolling of the next slab is calculated according to the formula:

[0089]

[0090] The current rough rolling pass rolling thickness setting value is 120mm, and the finishing rolling exit strip thickness setting value is 3mm. The calculation of the remaining passes is similar.

[0091] The judgment condition for whether the adjustment amount calculated in this step is issued is that the bending amount of the slab measured by the width gauge after the 1st / 3rd / 5th rolling of the previous slab is completed is less than 30mm. This indicator is determined according to the quality control regulations for slab bending on the production line site.

Claims

1. A camber adjustment method based on rough rolling camber value and finishing rolling wedge shape data, characterized in that: The present invention adjusts the sickle deformation of the slab by controlling the hydraulic pressure reduction of the four-roll roughing mill in the roughing process; an infrared width measuring instrument is arranged at 5m-10m from the roughing mill outlet; a finishing mill outlet multifunctional instrument is arranged at the finishing mill outlet to detect the wedge data of the strip; The adjustment method includes the following steps: S1: The first pass of slab rolling is adjusted based on: The bending value of the sickle elbow is measured by the width gauge at the rolling exit of this pass, and the leveling value of the first pass of the next slab is adjusted according to the bending value of the sickle elbow of the first pass of the slab rolled this time; the present invention only adjusts the hydraulic cylinder on the operating side of the roll, that is, the OS side, and the pressing value of the OS side of the roll is ΔS n1 ; S2: Starting from the second rolling pass, the adjustment basis for subsequent even-numbered passes is as follows: S21: According to the bending value of the tail of the sickle bend measured by the width gauge at the exit of the previous rolling pass, the leveling value of the strip in this pass is adjusted. The base value of the pressure reduction value in the i-th pass is ΔS i ; S22: According to the rolling force deviation on both sides of the current rolling pass, the next piece of steel is adjusted in the same pass, and the rolling force deviation head mean and body mean are calculated. The rolling force deviation measured by the rolling mill pressure sensor is the rolling force OS-DS value. The head mean minus the body mean is taken as the rolling force deviation variation. According to the roll gap leveling value of the rolling force deviation variation, the roll gap leveling value is adjusted according to ΔS ni Make adjustments; Starting from the second rolling pass, the adjustment values ​​of the subsequent even-numbered passes are superimposed on the original reference values, and the superimposed values ​​are as follows: ΔS of S21 i ΔS of the same pass S22 as the previous slab ni The data and, that is, ΔS i +ΔS ni ; S23: Determine the current pass leveling value, that is, the current pass ΔS i Same pass as the previous slab ΔS ni The sum of the values ​​is different from the first pass leveling value. If the difference is less than 20% of the maximum allowable adjustment of the roll gap leveling, S2 is leveled according to ΔS i +ΔS ni Implementation; if the difference value exceeds 20% of the allowable adjustment amount of the roll gap leveling, the leveling value in step S2 is the sum of the leveling value of S1 and 20% of the maximum allowable adjustment amount of the roll gap leveling; S3: The adjustment basis for odd-numbered passes starting from the third rolling pass is: S31: Adjustment is performed based on the tail mean and body mean of the rolling force deviation of the previous pass, wherein the tail mean is the last 10% of the slab length, and the body mean is the 30% to 70% of the length; the measured rolling force deviation is set as the rolling force OS-DS value, and the tail mean minus the body mean is taken as the rolling force deviation variation. The roll gap base leveling value is adjusted according to the calculated value of step S22, and the calculated value is ΔK ni ; S32: According to the bending value of the sickle elbow measured by the width gauge at the rolling exit of this pass, the leveling value of the next strip in the same pass is adjusted, and the adjustment is performed according to the value calculated by the method in step S21. The adjustment value is ΔK i ; Therefore, the initial adjustment value of the odd-numbered passes starting from the third pass of rolling is superimposed on the original reference value, and the superimposed value is as follows: The calculated value of this pass ΔK ni Calculated value ΔK of the same pass as the previous slab i The sum of ΔK ni +ΔK i ; S33: Determine the current pass leveling value, that is, the current pass ΔK ni Same pass as the previous slab ΔK i The sum of the values ​​is different from the first pass leveling value. If the difference is less than 20% of the maximum allowable adjustment of the roll gap leveling, then S3 is leveled according to ΔK ni +ΔK i Implementation; if the difference value exceeds 20% of the allowable adjustment amount of the roll gap leveling, the leveling value in step S3 is the sum of the leveling value of S1 and 20% of the maximum allowable adjustment amount of the roll gap leveling; S4: The condition for whether this step is implemented is that the bending amount of the slab measured by the width gauge after the 1st / 3rd / 5th rolling of the previous slab is completed is less than C0, and the C0 value is determined according to the quality control regulations for slab bending at the industrial site; if the condition is met, this step is implemented, otherwise this step is not implemented; This step is: Continuously roll m pieces of strip steel (usually m>2 pieces), and calculate the average value w of the full length of the wedge measured at the finish rolling exit of each roll fish ;w fish is the thickness value of the operating side minus the transmission side; if w fish If the value exceeds the preset target value continuously, the adjustment amount of each pass of the next slab rough rolling will increase by ΔS. ni value.

2. The camber adjustment method based on rough rolling camber value and finishing rolling wedge shape data according to claim 1, characterized in that: In step S1, ΔS n1 The expanded form is as follows: Among them, H1 is the setting value of the rolling thickness of the current pass of rough rolling; B max is the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the influence coefficient of steel grade, which is related to the lateral flow characteristics of the slab material and takes the value [0,2]; C is the bending value at 5m of the slab head measured by the exit width gauge, in mm.

3. The camber adjustment method based on rough rolling camber value and finishing rolling wedge shape data according to claim 1, characterized in that: In step S21, ΔS i The expanded form is as follows: Among them, H i B is the setting value of the rolling thickness of the current pass of rough rolling; max is the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the steel grade influence coefficient, with a value of [0,2]; C is the head bending value measured at the outlet, in mm.

4. The camber adjustment method based on rough rolling camber value and finishing rolling wedge shape data according to claim 1, characterized in that: In step S22, ΔS ni The expanded form is as follows: Among them, H i B is the setting value of the rolling thickness of the current pass of rough rolling; max is the maximum strip width of the production line, in mm; B is the width of the current rolled strip, in mm; a is the steel grade influence coefficient, with a value of [0,2]; ΔF i It is the rolling force deviation change, unit is KN.

5. The camber adjustment method based on rough rolling camber value and finishing rolling wedge shape data according to claim 1, characterized in that: In step S4, ΔS ni The expanded form is as follows: Wherein, Hi is the setting value of the rolling thickness of the current pass of rough rolling, and hi is the setting value of the thickness of the finishing outlet strip, in mm.

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