Method for setting roll shape of finishing mill without roll shifting device

Abstract

The finishing mill roll shape setting method without the roll shifting device comprises the steps that when any finishing mill in a finishing mill production line changes a supporting roll, a standby supporting roll and a plurality of standby working rolls are configured for the finishing mill; according to the maximum and minimum supporting roller diameters, the maximum and minimum working roller diameters and the roller diameters of the standby supporting roller and the standby working roller which are theoretically designed by the finishing mill, the maximum and minimum converted roller diameter values and the target converted roller diameter value are determined; calculating a target working roll shape amount corresponding to the to-be-used working roll; grinding the to-be-used working roll according to the target working roll shape amount corresponding to the to-be-used working roll; in the working period of the standby supporting roller, the multiple standby working rollers are alternately used according to a preset time interval, and for the standby working rollers which are alternately taken down from the finishing mill in the working period of the standby supporting roller, the alternately taken-down standby working rollers are ground again according to the target working roller shape quantity corresponding to the multiple standby working rollers; and the supporting rollers can be continuously and alternately used during the working period of the supporting rollers.

Description

Technical Field

[0001] The invention relates to the technical field of steel rolling, and in particular to a roller shape setting method for a finishing mill without a roller shifting device. Background Art

[0002] Some hot rolling production lines have six-stand finishing mills without roll shifting function, and the bending roll function is a later modification. The bending roll force has an effective control range of only 25 tons to 100 tons. The support rolls are flat rolls, and the working rolls are conventional flat rolls (generally concave rolls). Daily plate shape control mainly relies on the coordinated control of the bending rolls and the original working roll shape, and the rolling load distribution is appropriately adjusted to assist in fine-tuning. The control ability for plate shape is relatively limited. The inventor found that the rolling line often has serious middle waves or double-sided waves after replacing the finishing support rolls and resuming production. Due to the lack of roll shifting function to adjust the roll shape online, the bending roll control ability is weak and cannot eliminate the wave shape, and production cannot continue. It is necessary to stop the machine to urgently modify the working roll shape. In addition, there is a situation where one modification is incomplete and needs to be modified twice, which seriously affects the quality of the rolled steel plate. Stopping to modify the roll shape affects the production efficiency.

[0003] In the process of implementing the present invention, the applicant discovered that there are at least the following problems in the prior art:

[0004] Finishing mills without roll shifting function and weak bending roll control ability often experience severe center waves or double-side waves when resuming production after replacing the finishing support rolls, which seriously affects the quality of the rolled steel plates. Stopping the mill to modify the roll shape affects production operation efficiency. Summary of the invention

[0005] The embodiment of the present invention provides a method for setting the roll shape of a finishing mill without a roll shifting device, a method for processing the roll shape of a finishing mill without a roll shifting device, and a method for adjusting the roll shape of a finishing mill without a roll shifting device, so as to solve the problem that a finishing mill unit without a roll shifting function and a weak bending roll control ability often has severe middle waves or double-side waves when resuming production after replacing the finishing support rolls, which seriously affects the quality of the rolled steel plates, and the production operation efficiency is affected by stopping the machine to modify the roll shape.

[0006] To achieve the above-mentioned purpose, on the one hand, an embodiment of the present invention provides a method for setting the roll shape of a finishing mill without a roll shifting device, comprising:

[0007] When any finishing mill in the finishing rolling production line changes the backup roll, a standby backup roll and a plurality of standby working rolls are configured for the finishing mill;

[0008] Determine the maximum converted roll diameter value according to the maximum support roll diameter and the maximum working roll diameter of the finishing mill in theoretical design, determine the minimum converted roll diameter value according to the minimum support roll diameter and the minimum working roll diameter of the finishing mill in theoretical design, and determine the target converted roll diameter value according to the roll diameter of the standby support roll and the roll diameters corresponding to the plurality of standby working rolls;

[0009] The target working roll shape corresponding to the plurality of working rolls to be used is calculated according to the following formula (1):

[0010]

[0011] Where A is the target work roll shape, in micrometers; d max is the maximum converted roller diameter, in millimeters; d min is the minimum converted roller diameter value, in millimeters; d is the target converted roller diameter value, in millimeters; A min A is the minimum limit roll shape corresponding to the working roll used when the finishing mill uses the theoretically designed minimum roll diameter support roll and working roll, in micrometers; max It is the maximum limit roll shape corresponding to the working rolls used when the finishing mill uses the backup rolls and working rolls with the maximum roll diameter designed theoretically, in micrometers;

[0012] Grinding the plurality of standby work rolls according to target work roll shapes corresponding to the plurality of standby work rolls;

[0013] During the operation of the standby backup roll, the plurality of standby working rolls are rotated at preset time intervals, and for the standby working rolls rotated off from the finishing mill during the operation of the standby backup roll, the rotated standby working rolls are re-ground according to the target working roll shapes corresponding to the plurality of standby working rolls, so as to be continuously rotated during the operation of the backup roll;

[0014] The target work roll shape is the amount by which the diameter of the middle portion of the standby work roll after grinding is smaller than the diameter of the end portion.

[0015] Among them, the maximum converted roll diameter value is the converted roll diameter value corresponding to the moment of inertia of the overall roll system rigidity composed of the working rolls and support rolls of the maximum roll diameter theoretically designed for the finishing mill when converted into one; the minimum converted roll diameter value is the converted roll diameter value corresponding to the moment of inertia of the overall roll system rigidity composed of the working rolls and support rolls of the minimum roll diameter theoretically designed for the finishing mill when converted into one; the target converted roll diameter value is the converted roll diameter value corresponding to the moment of inertia of the overall roll system rigidity composed of the stand-by working rolls and stand-by support rolls when converted into one; the stand-by working rolls are used to replace the finishing mill when the working rolls and / or support rolls are replaced. The working roll currently used on the rolling mill; the standby support roll is used to replace the support roll currently used on the finishing mill when the finishing mill changes the support roll; the minimum limit roll shape is the work roll shape corresponding to the working roll of the finishing mill under the target constraint that the plate shape after finishing rolling is a straight plate shape in the current production, when the finishing mill adopts the theoretically designed support roll and work roll combination with the minimum roll diameter; the maximum limit roll shape is the work roll shape corresponding to the working roll of the finishing mill under the target constraint that the plate shape after finishing rolling is a straight plate shape in the current production, when the finishing mill adopts the theoretically designed support roll and work roll combination with the maximum roll diameter. The work roll shape is the amount by which the diameter of the middle part of the working roll after grinding is smaller than the diameter of the end part.

[0016] Furthermore, the maximum converted roll diameter value is determined based on the maximum support roll diameter and the maximum working roll diameter of the theoretical design of the finishing mill, including:

[0017] The maximum backup roll diameter and the maximum working roll diameter of the finishing mill in theoretical design are input into the following formula (2) to obtain the maximum converted roll diameter value;

[0018]

[0019] Among them, d max is the maximum converted roller diameter, in millimeters; d 支max is the maximum support roll diameter of the finishing mill in theoretical design, in millimeters; d 工max is the theoretically designed maximum working roll diameter of the finishing mill, in millimeters; μ max It is the preset conversion coefficient when calculating the maximum converted roller diameter value.

[0020] Furthermore, the minimum converted roll diameter value is determined based on the minimum support roll diameter and the minimum working roll diameter theoretically designed for the finishing mill, including:

[0021] The theoretically designed minimum support roll diameter and the minimum working roll diameter of the finishing mill are input into the following formula (3) to obtain the minimum converted roll diameter value;

[0022]

[0023] Among them, d min is the minimum converted roller diameter value, in millimeters; d 支min The minimum diameter of the support rolls in the theoretical design of the finishing mill, in millimeters; d 工min The minimum working roll diameter of the finishing mill in theoretical design, in millimeters; μ min It is the preset conversion coefficient when calculating the minimum converted roller diameter value.

[0024] Further, the target converted roll diameter value is determined according to the roll diameter of the standby support roll and the roll diameters corresponding to the plurality of standby working rolls, including:

[0025] The average value of the roll diameters of the plurality of standby working rolls is used as the roll diameters corresponding to the plurality of standby working rolls, and the roll diameter of the standby backup roll and the roll diameters corresponding to the plurality of standby working rolls are input into the following formula (4) to obtain a target converted roll diameter value;

[0026]

[0027] Wherein, d is the converted roller diameter to be used, in millimeters; d 支 is the roller diameter of the standby support roller, in millimeters; d 工 is the roller diameter corresponding to the multiple stand-by working rollers, in millimeters; μ is the preset conversion coefficient when calculating the target converted roller diameter value.

[0028] Furthermore, the range of the preset conversion coefficient for calculating the maximum converted roller diameter value, the minimum converted roller diameter value and the target converted roller diameter value includes: arrive

[0029] Further, the preset conversion coefficients for calculating the maximum converted roller diameter value, the minimum converted roller diameter value and the target converted roller diameter value are:

[0030] Further, the minimum limit roll shape amount and the maximum limit roll shape amount are negative values, and the absolute values ​​of the minimum limit roll shape amount and the maximum limit roll shape amount of the upstream finishing mill in the finishing mill production line are respectively smaller than the absolute values ​​of the minimum limit roll shape amount and the maximum limit roll shape amount of the downstream finishing mill.

[0031] Furthermore, the finishing mill production line includes 6 continuous finishing mills; starting from the upstream side of the finishing mill production line, the minimum limit roll shape of the 1st to 3rd mills is -100 microns, and the maximum limit roll shape is -30 microns; the minimum limit roll shape of the 4th to 6th finishing mills is -130 microns, and the maximum limit roll shape is -60 microns.

[0032] Furthermore, the formula for calculating the working roll shape of the standby working roll and the formula for calculating the maximum converted roll diameter value, the minimum converted roll diameter value and the target converted roll diameter value are edited into a computer program, and when used, the roll diameter of the standby support roll and the roll diameter corresponding to the standby working roll are input to obtain the target working roll shape corresponding to the standby working roll.

[0033] Further, the finishing mill production line includes 6 continuously rolling finishing mills; the maximum roll diameter of the support roll of the sixth finishing mill starting from the upstream side of the finishing mill production line is 1524 mm, the minimum roll diameter of the support roll is 1374 mm, the maximum roll diameter of the working roll is 754 mm, the minimum roll diameter of the working roll is 681 mm, the minimum limit roll shape is -130 μm, the maximum limit roll shape is -60 μm, the maximum converted roll diameter value is 1712.5 mm, and the minimum converted roll diameter value is 1544.25 mm;

[0034] The work roll shape of the work rolls of the sixth finishing mill from the upstream side of the finishing mill production line is calculated according to the following formula (5):

[0035]

[0036] Where A6 represents the working roll shape of the working roll of the sixth finishing mill, in microns; d 支6 Indicates the diameter of the standby support roll of the sixth finishing mill, in millimeters; d 工6 It indicates the diameter of the standby working roll of the sixth finishing mill, in millimeters.

[0037] The above technical solution has the following beneficial effects: by calculating the converted roll diameter, combining the maximum and minimum roll shape quantities, and adopting a simple linear correspondence, the roll shape quantity of the standby working roll is calculated for advance modification of the roll shape. Before replacing the support roll, according to the roll diameter data of the new standby support roll and the standby working roll, a reasonable roll shape quantity of the working roll is pre-calculated, and the roll shape modification quantity is transferred to the roll grinding operation area in advance, and the grinding parameters are modified to obtain a new standby working roll roll shape. After replacing the new support roll and resuming production, the new roll shape can be matched and used for steel rolling production, effectively improving the plate shape control stability of the finishing mill with weak roll bending and cutting capabilities without shifting rolls. After testing, after using the embodiment of the present invention, there is no serious double-sided wave or middle wave caused by roll shape mismatch after the replacement of the support roll. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 The present invention is a flowchart of a method for setting the roller shape of a finishing mill without a roller shifting device according to one embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] On the one hand, if Figure 1 As shown, an embodiment of the present invention provides a method for setting the roll shape of a finishing mill without a roll shifting device, comprising:

[0042] Step S10, when any finishing mill in the finishing rolling production line changes the backup roll, equipping the finishing mill with a standby backup roll and a plurality of standby working rolls;

[0043] Step S11, determining a maximum converted roll diameter value according to a maximum support roll diameter and a maximum working roll diameter of the finishing mill in theoretical design, determining a minimum converted roll diameter value according to a minimum support roll diameter and a minimum working roll diameter of the finishing mill in theoretical design, and determining a target converted roll diameter value according to the roll diameter of the standby support roll and the roll diameters corresponding to the plurality of standby working rolls;

[0044] Step S12, calculating the target working roll shape corresponding to the plurality of working rolls to be used according to formula (1);

[0045] Step S13, grinding the plurality of standby working rolls according to the target working roll shapes corresponding to the plurality of standby working rolls;

[0046] Step S14, during the working period of the standby backup roll, the plurality of standby working rolls are rotated at preset time intervals, and for the standby working rolls rotated off from the finishing mill during the working period of the standby backup roll, the rotated standby working rolls are re-ground according to the target working roll shapes corresponding to the plurality of standby working rolls, so as to be continuously rotated for use during the working period of the backup roll;

[0047] The target work roll shape is the amount by which the diameter of the middle portion of the standby work roll after grinding is smaller than the diameter of the end portion.

[0048] Among them, the maximum converted roll diameter value is based on the cross-sectional inertia moment of the cylindrical object, with the goal of converting the inertia moment of the overall roll system rigidity composed of the theoretically designed working roll of the maximum roll diameter and the support roll of the maximum roll diameter of the finishing mill into one, and a roll diameter value is obtained by converting the roll diameter of the theoretically designed working roll of the maximum roll diameter and the support roll of the maximum roll diameter; the minimum converted roll diameter value is based on the cross-sectional inertia moment of the cylindrical object, with the goal of converting the inertia moment of the overall roll system rigidity composed of the theoretically designed working roll of the minimum roll diameter and the support roll of the minimum roll diameter of the finishing mill into one, and a roll diameter value is obtained by converting the roll diameter of the theoretically designed working roll of the minimum roll diameter and the support roll of the minimum roll diameter; the target converted roll diameter value is based on the cross-sectional inertia moment of the cylindrical object, with the goal of converting the inertia moment of the overall roll system rigidity composed of the stand-by working roll and the stand-by support roll into The goal is to integrate the roll diameter of the standby support roll and the roll diameter corresponding to the standby working roll to obtain a roll diameter value; the standby working roll is used to replace the working roll currently used on the finishing mill when the finishing mill changes the working roll and / or support roll; the standby support roll is used to replace the support roll currently used on the finishing mill when the finishing mill changes the support roll; the minimum limit roll shape is the work roll shape corresponding to the working roll of the finishing mill under the target constraint that the plate shape after finishing rolling is a straight plate shape in the current production, when the finishing mill adopts the support roll and working roll with the minimum roll diameter designed in theory; the maximum limit roll shape is the work roll shape corresponding to the working roll of the finishing mill under the target constraint that the plate shape after finishing rolling is a straight plate shape in the current production, when the finishing mill adopts the support roll and working roll with the maximum roll diameter designed in theory.

[0049] In some embodiments, the replacement cycles of the support rolls and working rolls of the finishing mill are usually different. Usually, the replacement cycle of the standby support rolls is significantly longer than that of the standby working rolls, so during the operation of the same standby support roll, multiple standby working rolls need to be rotated and used at preset time intervals. The replacement cycle of the support rolls of the finishing mill is relatively long, for example, once a month, and the replacement cycle of the working rolls is relatively short, usually with a preset time interval of several hours, for example, 2 to 3 hours. During the use of a standby support roll, the standby working roll will be replaced many times. Each time the (standby) support roll is replaced, multiple (standby) working rolls will be provided for the (standby) support roll, and these matching standby working rolls will be rotated during the operation of the standby support roll. Each finishing mill stipulates the maximum roll diameter of the working roll that can be applied, the minimum roll diameter of the working roll, the maximum roll diameter of the support roll, and the minimum roll diameter of the support roll that can be applied according to the standard theoretical design. When replacing the support roll, it is necessary to determine the standby support roll and multiple standby working rolls that match the standby support roll according to the spare parts of the support roll and working roll of the finishing production line at that time and the grinding capacity of the grinding workshop. The roll diameters of multiple standby working rolls are the same or the deviation between the roll diameters of multiple standby working rolls is within the preset tolerance range. Preferably, the preset tolerance range is -10 mm to 10 mm. In the traditional scheme, after each selection of the support roll and the working roll, it is necessary to directly observe the condition of the rolled steel plate on the finishing mill, and then disassemble it for grinding. After repeated actual measurement and grinding, the support roll and working roll that meet the required working conditions are finally obtained. The traditional scheme consumes a lot of time every time the support roll is replaced, which seriously reduces the efficiency. The embodiment of the present invention calculates the target working roll shape of multiple standby working rolls that match the standby support roll in advance, and completes the grinding before use, thereby avoiding repeated actual measurement and grinding. The replacement efficiency of the support roll and the working roll is improved. The principle for converting the moment of inertia of the rigidity of the whole roll system composed of the working roll (with the largest roll diameter, the smallest diameter or in standby) and the corresponding support roll (with the largest roll diameter, the smallest diameter or in standby) into one is based on the calculation method of the moment of inertia of the cylinder section. Since the roll neck size, bearing seat size, roll body length, etc. of the support roll and the working roll are fixed, only the roll body diameter changes each time. Therefore, a simple measurement method can be used to ignore the influence of the roll neck and the bearing seat, and only consider the change of the roll body diameter. In the process of calculating the roll deflection, the change of the roll diameter mainly affects the moment of inertia of the roll body. Therefore, it is only necessary to measure the change of the moment of inertia of the roll to roughly deduce the simple relationship between the roll diameter and the roll shape. The calculation formula for the moment of inertia of the cylindrical object is:

[0050]

[0051] Where I is the moment of inertia of the area, in mm 4 (millimeter to the fourth power); D is the diameter of the cylindrical object in millimeters.

[0052] According to the above formula (6), the section inertia moment is proportional to the fourth power of the diameter. Therefore, when the inertia moments of the rigidity of the whole roll system formed by the theoretical maximum roll diameter work roll, the minimum roll diameter work roll and the standby work roll are converted into one, the maximum converted roll diameter value, the minimum converted roll diameter value and the standby converted roll diameter value can be determined by the ratio of the theoretical maximum roll diameter work roll, the theoretical minimum roll diameter work roll and the standby work roll to the theoretical maximum roll diameter support roll, the theoretical minimum roll diameter support roll and the standby support roll. The minimum limit roll shape and the maximum limit roll shape can be obtained by actual measurement. In production, each finishing mill is preset with a corresponding load reduction. Combined with the theoretical design of the support rolls and working rolls of each finishing mill, the roll diameters may be the same or different between each finishing mill, which may result in the minimum limit roll shape and the maximum limit roll shape corresponding to different finishing mills being the same or different. When measuring the minimum limit roll shape, the support rolls and working rolls with the minimum roll diameter theoretically designed for the finishing mill are used for each finishing mill, and the slabs are finish-rolled according to the load reduction required by the current production. The working roll shape of the working rolls is adjusted according to the actual plate shape of the slab after finish rolling, until the plate shape after finish rolling is straight. The working roll shape of the working rolls at this time is the minimum limit roll shape; when measuring the maximum limit roll shape, the support rolls and working rolls with the maximum roll diameter theoretically designed for the finishing mill are used for each finishing mill, and the slabs are finish-rolled according to the load reduction required by the current production. The working roll shape of the working rolls is adjusted according to the actual plate shape of the slab after finish rolling, until the plate shape after finish rolling is straight. The working roll shape of the working rolls at this time is the maximum limit roll shape.

[0053] The embodiment of the present invention has the following beneficial effects: by calculating the converted roll diameter, combining the maximum and minimum roll shape quantities, and using a simple linear correspondence, the roll shape quantity of the standby working roll is calculated for advance modification of the roll shape. Before replacing the support roll, according to the roll diameter data of the new standby support roll and the standby working roll, a reasonable roll shape quantity of the working roll is pre-calculated, and the roll shape modification quantity is transferred to the roll grinding operation area in advance, and the grinding parameters are modified to obtain a new standby working roll roll shape. After replacing the new support roll and resuming production, the new roll shape can be matched and used for steel rolling production, effectively improving the plate shape control stability of the finishing mill with weak roll bending and cutting capabilities without shifting rolls. After testing, after using the embodiment of the present invention, there is no serious double-sided wave or middle wave caused by roll shape mismatch after the replacement of the support roll.

[0054] Furthermore, the maximum converted roll diameter value is determined based on the maximum support roll diameter and the maximum working roll diameter of the theoretical design of the finishing mill, including:

[0055] The maximum backup roll diameter and the maximum working roll diameter of the finishing mill designed in theory are input into formula (2) to obtain the maximum converted roll diameter value.

[0056] In some embodiments, the maximum converted roll diameter value is obtained by converting the roll diameters of the support rolls with the maximum roll diameter and the working rolls with the maximum roll diameter of the theoretical design of the finishing mill into one by formula (2). Since the roll neck size, bearing seat size, roll body length, etc. of the support rolls and the working rolls are fixed, only the roll body diameter changes each time. Therefore, a simple measurement method can be used to ignore the influence of the roll neck and the bearing seat, and only consider the change of the roll body diameter. In the process of calculating the roll deflection, the change of the roll diameter mainly affects the roll body moment of inertia. Therefore, it is only necessary to measure the change of the roll moment of inertia to roughly deduce the simple relationship between the roll diameter and the roll shape. The calculation formula for the cross-sectional moment of inertia of a cylindrical object is formula (6); according to the above formula (6), the cross-sectional moment of inertia is proportional to the fourth power of the diameter; preferably, the preset conversion coefficient μ when calculating the maximum converted roll diameter value is max The fourth power of the ratio of the theoretically designed maximum roll diameter of the working roll to the maximum roll diameter of the support roll can be taken. Considering the direct contact between the working roll and the steel plate and the bending roll force control, and combining the on-site conditions to determine the influence of the inertia moment of the working roll, μ max The value of may be greater than or equal to the fourth power of the ratio of the maximum roll diameter of the working roll in the theoretical design of the finishing mill to the maximum roll diameter of the backup roll. Preferably, the value μ may be multiplied by 4 based on the fourth power of the ratio of the maximum roll diameter of the working roll in the theoretical design of the finishing mill to the maximum roll diameter of the backup roll. max Since the ratio of the maximum roll diameter of the working rolls of each finishing mill in the same finishing production line to the maximum roll diameter of the backup roll is not much different, it is preferred that μ max The fourth power of the ratio of the theoretically designed maximum roll diameter of the working roll to the maximum roll diameter of the backup roll of each finishing mill in the entire finishing production line can be used. Considering the direct contact between the working roll and the steel plate and the bending roll force control, and combining the on-site conditions to determine the influence of the inertia moment of the working roll, μ max The value of may be greater than or equal to the fourth power of the approximate ratio of the theoretically designed maximum roll diameter of the working rolls of each finishing mill in the entire finishing production line to the maximum roll diameter of the backup roll. Preferably, the value μ may be obtained by multiplying the fourth power of the approximate ratio of the theoretically designed maximum roll diameter of the working rolls of each finishing mill in the entire finishing production line to the maximum roll diameter of the backup roll by 4. maxThe method for determining the approximate ratio of the theoretically designed maximum roll diameter of the working rolls of each finishing mill in the entire finishing production line to the maximum roll diameter of the backup roll includes but is not limited to dividing the average value of the theoretically designed maximum roll diameters of the working rolls of each finishing mill in the entire finishing production line by the average value of the maximum roll diameters of the backup rolls, or dividing the median value of the theoretically designed maximum roll diameters of the working rolls of each finishing mill by the median value of the maximum roll diameters of the backup rolls, etc.

[0057] The embodiment of the present invention has the following technical effects: innovatively associates the roll shape of the working roll with the change in roll diameter of the support roll and the working roll, and finds that the reason why serious double-sided waves and middle waves are prone to occur after replacing the finishing support roll is mainly because the change in roll diameter of the support roll and the working roll causes the change in roll system rigidity, the flexural deformation of the roll system under the same load is different, the actual roll gap shape of the working roll changes, and the matching of the front and rear frame plate shapes exceeds the control range, resulting in serious wave shapes. Based on this problem, the embodiment of the present invention is implemented, and when replacing the support roll, the roll shape of the new working roll is calculated and modified in advance to match the replaced support roll. According to the moment of inertia of the cylindrical section and the actual situation on site, a converted roll diameter value is designed that can characterize the rigidity of the entire roll system of the support roll and the working roll.

[0058] Furthermore, the minimum converted roll diameter value is determined based on the minimum support roll diameter and the minimum working roll diameter theoretically designed for the finishing mill, including:

[0059] The theoretically designed minimum support roll diameter and minimum working roll diameter of the finishing mill are input into formula (3) to obtain the minimum converted roll diameter value.

[0060] In some embodiments, the formula (3) is used to convert the moments of inertia of the minimum roller diameter support roller and the minimum roller diameter working roller of the theoretical design of the finishing mill into one, and the roller diameters of the minimum roller diameter support roller and the minimum roller diameter working roller are converted into one roller diameter value to obtain the minimum converted roller diameter value. Since the roll neck size, bearing seat size, roll body length, etc. of the support roller and the working roller are fixed, only the roll body diameter changes each time, so a simple measurement method can be used to ignore the influence of the roll neck and the bearing seat, and only consider the change of the roll body diameter. In the process of calculating the roll deflection, the change of the roll diameter mainly affects the moment of inertia of the roll body, so it is only necessary to measure the change of the moment of inertia of the roll to roughly deduce the simple relationship between the roll diameter and the roll shape. The calculation formula for the cross-sectional moment of inertia of a cylindrical object is formula (6). According to the above formula (6), the cross-sectional moment of inertia is proportional to the fourth power of the diameter; preferably, the preset conversion coefficient μ when calculating the minimum converted roll diameter value min The fourth power of the ratio of the theoretical design minimum roll diameter of the working roll to the minimum roll diameter of the support roll can be taken. Considering the direct contact between the working roll and the steel plate and the bending roll force control, and combining the on-site conditions to determine the influence of the inertia moment of the working roll, μ minThe value of may be greater than or equal to the fourth power of the ratio of the minimum roll diameter of the working roll in the theoretical design of the finishing mill to the minimum roll diameter of the backup roll. Preferably, the value μ may be multiplied by 4 based on the fourth power of the ratio of the minimum roll diameter of the working roll in the theoretical design of the finishing mill to the minimum roll diameter of the backup roll. min Since the ratio of the minimum roll diameter of the working rolls of each finishing mill in the same finishing production line to the minimum roll diameter of the backup roll is not much different, it is preferred that μ min The fourth power of the ratio of the theoretically designed minimum roll diameter of the working roll to the minimum roll diameter of the backup roll of each finishing mill in the entire finishing production line can be used. Considering the direct contact between the working roll and the steel plate and the bending roll force control, and combining the on-site conditions to determine the influence of the inertia moment of the working roll, μ min The value of may be greater than or equal to the fourth power of the approximate ratio of the theoretically designed minimum roll diameter of the working rolls of each finishing mill in the entire finishing production line to the minimum roll diameter of the backup roll. Preferably, the value μ may be multiplied by 4 based on the fourth power of the approximate ratio of the theoretically designed minimum roll diameter of the working rolls of each finishing mill in the entire finishing production line to the minimum roll diameter of the backup roll. min The method for determining the approximate ratio of the theoretically designed minimum roll diameter of the working rolls of each finishing mill to the minimum roll diameter of the backup roll includes but is not limited to dividing the average value of the theoretically designed minimum roll diameters of the working rolls of each finishing mill in the entire finishing production line by the average value of the minimum roll diameters of the backup rolls, or dividing the median value of the theoretically designed minimum roll diameters of the working rolls of each finishing mill by the median value of the minimum roll diameters of the backup rolls, etc.

[0061] The embodiment of the present invention has the following technical effects: innovatively associates the roll shape of the working roll with the change in roll diameter of the support roll and the working roll, and finds that the reason why serious double-sided waves and middle waves are prone to occur after replacing the finishing support roll is mainly because the change in roll diameter of the support roll and the working roll causes the change in roll system rigidity, the flexural deformation of the roll system under the same load is different, the actual roll gap shape of the working roll changes, and the matching of the front and rear frame plate shapes exceeds the control range, resulting in serious wave shapes. Based on this problem, the embodiment of the present invention is implemented, and when replacing the support roll, the roll shape of the new working roll is calculated and modified in advance to match the replaced support roll. According to the moment of inertia of the cylindrical section and the actual situation on site, a converted roll diameter value is designed that can characterize the rigidity of the entire roll system of the support roll and the working roll.

[0062] Further, the target converted roll diameter value is determined according to the roll diameter of the standby support roll and the roll diameters corresponding to the plurality of standby working rolls, including:

[0063] The average value of the roll diameters of the plurality of standby working rolls is taken as the roll diameters corresponding to the plurality of standby working rolls, and the roll diameter of the standby backup roll and the roll diameters corresponding to the plurality of standby working rolls are input into formula (4) to obtain the target converted roll diameter value.

[0064] In some embodiments, the formula (4) is used to convert the moment of inertia of the standby support roll and the standby working roll into one, and the roll diameter of the standby support roll and the standby working roll is converted into a roll diameter value to obtain the standby converted roll diameter value. Since the roll neck size, bearing seat size, roll body length, etc. of the support roll and the working roll are fixed, only the roll body diameter changes each time, so a simple measurement method can be used to ignore the influence of the roll neck and the bearing seat, and only consider the change of the roll body roll diameter. In the process of calculating the roll deflection, the change of the roll diameter mainly affects the moment of inertia of the roll body, so only the change of the moment of inertia of the roll needs to be measured to roughly deduce the simple correlation between the roll diameter and the roll shape. The calculation formula for the cross-sectional moment of inertia of a cylindrical object is formula (6). According to the above formula (6), the cross-sectional moment of inertia is proportional to the fourth power of the diameter; preferably, the preset conversion coefficient μ when calculating the target converted roll diameter value can be taken as the fourth power of the ratio of the roll diameter of the standby working roll to the roll diameter of the standby support roll. Considering that the working roll is in direct contact with the steel plate and the bending roll force is controlled, and the influence of the moment of inertia of the working roll is determined in combination with the on-site conditions, the value of μ can be greater than or equal to the fourth power of the ratio of the roll diameter of the standby working roll to the roll diameter of the standby support roll. Preferably, the value of μ can be multiplied by 4 based on the fourth power of the ratio of the roll diameter of the standby working roll to the roll diameter of the standby support roll. Since the roll diameter ratios of each working roll relative to each support roll in the same finishing rolling production line are not much different, it is preferred that μ can adopt the fourth power of the approximate ratio of the roll diameter of the working roll used in the entire finishing rolling production line relative to the support roll. Considering that the working roll is in direct contact with the steel plate and the bending roll force is controlled, and the influence of the moment of inertia of the working roll is determined in combination with the on-site conditions, the value of μ can be greater than or equal to the fourth power of the approximate ratio of the roll diameter of the working roll used in the entire finishing rolling production line relative to the support roll. Preferably, the value of μ can be multiplied by 4 based on the fourth power of the approximate ratio of the roll diameter of the working roll used in the entire finishing rolling production line relative to the support roll. Methods for determining the approximate ratio of the working roll to the backup roll diameter include but are not limited to dividing the average working roll diameter by the average backup roll diameter, dividing the median working roll diameter by the median backup roll diameter, etc.

[0065] The embodiment of the present invention has the following technical effects: innovatively associates the roll shape of the working roll with the change in roll diameter of the support roll and the working roll, and finds that the reason why serious double-sided waves and middle waves are prone to occur after replacing the finishing support roll is mainly because the change in roll diameter of the support roll and the working roll causes the change in roll system rigidity, the flexural deformation of the roll system under the same load is different, the actual roll gap shape of the working roll changes, and the matching of the front and rear frame plate shapes exceeds the control range, resulting in serious wave shapes. Based on this problem, the embodiment of the present invention is implemented, and when replacing the support roll, the roll shape of the new working roll is calculated and modified in advance to match the replaced support roll. According to the moment of inertia of the cylindrical section and the actual situation on site, a converted roll diameter value is designed that can characterize the rigidity of the entire roll system of the support roll and the working roll.

[0066] Preferably, the range of the preset conversion coefficient for calculating the maximum converted roller diameter value, the minimum converted roller diameter value and the target converted roller diameter value includes: arrive

[0067] Preferably, the preset conversion coefficients for calculating the maximum converted roller diameter value, the minimum converted roller diameter value and the target converted roller diameter value are:

[0069] In some embodiments, the moments of inertia of the support roll and the working roll are converted into one. The diameter of the working roll of the production line is about 1 / 2 of the support roll, so the measured moment of inertia of the working roll is about 1 / 16 of the moment of inertia of the support roll. Considering that the working roll is in direct contact with the steel plate and the bending roll force is controlled, and the influence of the moment of inertia of the working roll is determined in combination with the on-site conditions, the preset conversion coefficient μ is used to convert the roll diameter of the working roll, and the value of μ is greater than or equal to 1 / 16.

[0070] The embodiment of the present invention has the following technical effects: innovatively associates the roll shape of the working roll with the change in roll diameter of the support roll and the working roll, and finds that the reason why serious double-sided waves and middle waves are prone to occur after replacing the finishing support roll is mainly because the change in roll diameter of the support roll and the working roll causes the change in roll system rigidity, the flexural deformation of the roll system under the same load is different, the actual roll gap shape of the working roll changes, and the matching of the front and rear frame plate shapes exceeds the control range, resulting in serious wave shapes. Based on this problem, the embodiment of the present invention is implemented, and when replacing the support roll, the roll shape of the new working roll is calculated and modified in advance to match the replaced support roll. According to the moment of inertia of the cylindrical section and the actual situation on site, a converted roll diameter value is designed that can characterize the rigidity of the entire roll system of the support roll and the working roll.

[0071] Further, the minimum limit roll shape amount and the maximum limit roll shape amount are negative values, and the absolute values ​​of the minimum limit roll shape amount and the maximum limit roll shape amount of the upstream finishing mill in the finishing mill production line are respectively smaller than the absolute values ​​of the minimum limit roll shape amount and the maximum limit roll shape amount of the downstream finishing mill.

[0072] Preferably, the finishing mill production line includes 6 continuous finishing mills; starting from the upstream side of the finishing mill production line, the minimum limit roll shape of the 1st to 3rd mills is -100 microns, and the maximum limit roll shape is -30 microns; the minimum limit roll shape of the 4th to 6th finishing mills is -130 microns, and the maximum limit roll shape is -60 microns.

[0073] In some embodiments, among the multiple finishing mills connected in series in the finishing mill production line, the upstream finishing mill usually bears a larger load distribution, a larger load, and a larger roll deflection than the downstream finishing mill, so the original roll shape design of the upstream finishing mill is slightly smaller. Preferably, the six stands of the finishing mill are all controlled according to the above method, and the front-end rolling mill F1-3 has a larger load distribution, a larger load, and a larger roll deflection than the F4-6 rolling mill, so the original roll shape design is slightly smaller. The front-end rolling mill F1-3 also needs to consider the convexity control and conduct multiple roll shape adjustment tests to finally determine the limit roll shape amount A of the F1-3 rolling mill. max =-30um, A min =-100um, determine the limit roll shape A of F4-6 rolling mill max =-60um, A min =-130um, the support rolls and working rolls of all rolling mills are universal, and the maximum and minimum roll diameter values ​​are consistent. All rolling mill data are edited into the computer, and the matching working roll roll shape can be output by simply inputting the support roll diameter and the working roll diameter. The technician can make fine adjustments to the calculated roll shape based on experience and then make modifications. Preferably, the finishing mill production line is specifically configured as a hot rolling production line finishing mill unit with six stands for continuous rolling, no roll shifting function, an effective control range of 25 tons to 100 tons for the bending roll force, and a flat roll for the support roll.

[0074] Furthermore, the formula for calculating the target working roll shape of the standby working roll and the formula for calculating the maximum converted roll diameter value, the minimum converted roll diameter value and the target converted roll diameter value are edited into a computer program, and when used, the roll diameter of the standby support roll and the roll diameter corresponding to the standby working roll are input to obtain the target working roll shape corresponding to the standby working roll.

[0075] In some embodiments, the roll shape calculation method is edited into a computer, and each time the support roll is replaced, the support roll and the working roll diameters only need to be input into the computer to calculate the matching roll shape. In addition, the historical roll shape data can be saved and recorded. Before replacing the support roll, the technician inputs the new support roll and working roll diameter data into the computer, and can pre-calculate the reasonable working roll shape, transfer the roll shape modification amount to the roll grinding operation area in advance, modify the grinding parameters to obtain the new working roll shape, and replace the new support roll to resume production. The new roll shape can be matched and used for steel rolling production, effectively improving the plate shape control stability of the finishing mill with weak roll bending and cutting capabilities without roll shifting, and improving the replacement efficiency.

[0076] Further, the finishing mill production line includes 6 continuously rolling finishing mills; the maximum roll diameter of the support roll of the sixth finishing mill starting from the upstream side of the finishing mill production line is 1524 mm, the minimum roll diameter of the support roll is 1374 mm, the maximum roll diameter of the working roll is 754 mm, the minimum roll diameter of the working roll is 681 mm, the minimum limit roll shape is -130 μm, the maximum limit roll shape is -60 μm, the maximum converted roll diameter value is 1712.5 mm, and the minimum converted roll diameter value is 1544.25 mm;

[0077] The work roll shape of the work rolls of the sixth finishing mill starting from the upstream side of the finishing mill production line is calculated according to the following formula (6).

[0078] The embodiment of the present invention has the following beneficial effects: the converted roller diameter value of the rigidity of the entire roller system of the support roller and the working roller is characterized according to the moment of inertia of the cylindrical section. By calculating the converted roller diameter, combining the maximum and minimum roller shape quantities, and using a simple linear correspondence, the standby working roller shape quantity of the standby working roller is calculated for advance modification of the roller shape. Before replacing the support roller, according to the new standby support roller and standby working roller diameter data, a reasonable working roller shape quantity is pre-calculated, and the roller shape modification quantity is transferred to the roller grinding operation area in advance, and the grinding parameters are modified to obtain a new standby working roller shape. Then, the new support roller is replaced and production is resumed to match the new roller shape for steel rolling production, effectively improving the plate shape control stability of the finishing mill with weak roll bending and cutting capabilities without shifting rolls. After testing, after using the embodiment of the present invention, there is no serious double-sided wave or middle wave caused by roll shape mismatch after the replacement of the support roller. The embodiment of the present invention specifically provides a calculation formula for the roll shape quantity of the working roll of the sixth finishing mill in the 6-stand continuous rolling finishing mill group, which is convenient for writing programs for execution and use in production.

[0079] The above technical solution of the embodiment of the present invention is described in detail below in conjunction with specific application examples. For technical details not introduced during the implementation process, please refer to the relevant description in the previous text.

[0080] The embodiment of the present invention belongs to the field of steel rolling technology, and is mainly aimed at a hot rolling finishing mill without a roll shifting function. Specifically, a more reasonable roll shape of the working roll is calculated according to the roll diameter changes of the finishing rolling support roll and the working roll, and the roll shape is adjusted and controlled in advance to avoid serious double-side waves or middle waves after replacing the support roll, which affect product quality and production stability.

[0081] The purpose of the embodiments of the present invention is to overcome the shortcomings of the prior art and to achieve a method of pre-calculating a reasonable working roll shape before replacing the finishing support roll to make early adjustments to match new working conditions, thereby avoiding losses caused by temporary emergency adjustments to the roll shape after the wave shape appears.

[0082] After long-term on-site tracking, it was found that the wave shape problem after the replacement of the support roll in the finishing rolling was caused by a large change in the diameter of the support roll and the working roll. Further analysis showed that the change in the diameter of the support roll and the working roll changed the rigidity of the roll system. The different deflection deformation of the working roll under the same load during steel rolling caused a large change in the shape of the actual working roll gap, and it was impossible to achieve a good front and rear frame plate shape matching, resulting in serious wave shape problems. When the roll diameter increases, the roll rigidity increases. Under the same load, the small roll deflection is equivalent to the small concavity of the actual roll gap, which is prone to middle waves; when the roll diameter decreases, the roll rigidity decreases. Under the same load, the large roll deflection is equivalent to the large concavity of the actual roll gap, which is prone to double-sided waves.

[0083] Therefore, the roll shape of the working roll needs to be adjusted in time according to the changes in the roll diameters of the support roll and the working roll. Since the actual production control at the steel rolling site is complex and has many influencing factors, it is considered to use the method of on-site experience to set the roll shape of the working roll.

[0084] After long-term on-site tracking, it is determined that the working roll shape of the working roll that can achieve the plate straightening effect when the minimum roll diameter support roll is matched with the minimum roll diameter working roll is A min ; Determine the working roll shape of the working roll that can achieve the plate straightening effect when the maximum roll diameter support roll is matched with the maximum roll diameter working roll as A max .

[0085] Since the roll neck size, bearing seat size, roll body length, etc. of the support roll and working roll are fixed, only the roll body diameter changes each time. Therefore, a simple measurement method can be used to ignore the influence of the roll neck and bearing seat and only consider the change of the roll body diameter.

[0086] In the process of calculating the roll deflection, the change of roll diameter mainly affects the moment of inertia of the roll body. Therefore, the simple relationship between the roll diameter and the roll shape can be roughly calculated by simply measuring the change of the moment of inertia of the roll.

[0087] The calculation formula for the cross-sectional moment of inertia of a cylindrical object is formula (6).

[0088] The moments of inertia of the support roll and the working roll are converted into one. The diameter of the working roll of this production line is about 1 / 2 of the support roll, so the measured moment of inertia of the working roll is about 1 / 16 of the moment of inertia of the support roll. However, considering that the working roll is in direct contact with the steel plate and the bending roll force is controlled, and combined with the on-site conditions, the influence of the moment of inertia of the working roll is increased to 1 / 4, and it is determined that the converted working roll diameter of the support roll is 1 / 4 of the working roll diameter.

[0089] The formulas for calculating the roll diameter are formula (2), formula (3) and formula (4), with the maximum calculated roll diameter d max Corresponding maximum roll shape A max , with the minimum converted roller diameter d minCorresponding minimum roll shape A min , the roll shape and the converted roll diameter adopt the phenomenon corresponding law (that is, the larger the converted roll diameter, the larger the roll shape required to match, and the smaller the converted roll diameter, the smaller the roll shape required to match). The working roll shape is calculated based on the roll diameter of the backup roll and the working roll diameter. The specific calculation formula of the working roll shape is formula (1);

[0090] Taking the F6 stand (the sixth finishing mill) of the production line consisting of 6 finishing mills as an example, after multiple roll shape modification tests, comparison and tracking, A max =-60um (micrometer), A min =-130um, maximum working roll and support roll diameter, minimum working roll and support roll diameter, among which, maximum working roll diameter, maximum support roll diameter, minimum working roll diameter and minimum support roll diameter are designed for rolling line equipment configuration. The roll diameter of new rolls (working rolls and support rolls) is the maximum roll diameter. After a period of use, they are replaced and ground on a grinder and replaced for use again. The roll diameter will decrease after each grinding. When the roll diameter of the working rolls and support rolls after repeated grinding and replacement reaches the minimum roll diameter, they can no longer be used. At this time, the rolls will be scrapped and no longer used.

[0091] The maximum and minimum converted roller diameters are shown in Table 1.

[0092] Minimum working roll 681mm Maximum working roll 754mm Minimum support roller 1374mm Maximum support roller 1524mm Minimum roller diameter conversion 1544.25mm Maximum roller diameter conversion 1712.5mm

[0093] Table 1F6 stand roll diameter data The real-time working roll shape is:

[0094]

[0095] Among them, A6 is the working roll shape of the standby working roll of the 6th finishing mill, in microns; d6 is the standby converted roll diameter value of the 6th finishing mill, in millimeters; d 支6 is the diameter of the standby support roll of the sixth finishing mill, in millimeters; d 工6 is the diameter of the standby working roll of the sixth finishing mill, in millimeters;

[0096] Edit this calculation formula into the computer. Each time the support roll is replaced, the roll diameter of the new support roll and the new working roll can be input in advance to calculate the more matching work roll shape. The roll shape of the working roll can be modified in advance to match the new support roll and working roll, and the stability of the plate shape quality can be guaranteed after resuming production.

[0097] The six stands of the finishing mill are all controlled according to the above method. Compared with the F4-6 mills, the front-end mill F1-3 has a larger load distribution, a larger load, and a larger roll deflection, so the original roll shape design is slightly smaller. The front-end mill F1-3 also needs to consider the crown control and conduct multiple roll shape adjustment tests to finally determine the limit roll shape amount A of the F1-3 mill. max=-30um, A min =-100um, determine the limit roll shape A of F4-6 rolling mill max =-60um, A min =-130um, the support rolls and working rolls of all rolling mills are universal, and the maximum and minimum roll diameter values ​​are consistent. All rolling mill data are edited into the computer, and only the support roll diameter and working roll diameter are input to output the matching working roll roll shape. The technician can make fine adjustments to the calculated roll shape based on experience and then modify it. Table 2 is the input roll diameter table, and Table 3 is the corresponding output working roll shape table. Table 2 lists the roll diameters input by the six finishing mills when the support rolls and working rolls were replaced on June 15, July 15, and August 15; Table 3 gives the working roll shape of the working rolls of each finishing mill.

[0098]

[0099] Table 2 is the input roller diameter table

[0100]

[0101] Table 3 is the output work roll shape scale

[0102] The embodiments of the present invention have the following technical effects:

[0103] The roll shape of the working roll is innovatively associated with the change in roll diameter of the support roll and the working roll, and it is found that the main reason why serious double-sided waves and middle waves are prone to occur after replacing the finishing support roll is that the change in roll diameter of the support roll and the working roll leads to a change in the rigidity of the roll system, the flexural deformation of the roll system is different under the same load, the actual roll gap shape of the working roll changes, and the plate shape matching of the front and rear frames exceeds the control range, resulting in serious wave shape. Based on this problem, an embodiment of the present invention is implemented, and when replacing the support roll, the roll shape of the new working roll is calculated and modified in advance to match the replaced support roll. According to the moment of inertia of the cylindrical section and the actual situation on site, a reduced roll diameter value is designed that can characterize the rigidity of the entire roll system of the support roll and the working roll. After long-term tracking and roll shape test comparison on site, it is summarized that the roll shape A of the working roll that can ensure a good plate shape for each rolling mill at the maximum and minimum reduced roll diameters. max and A minAt the same time, the front-end rolling mill F1-3 also takes into account the convexity control requirements. A method for calculating the reasonable roll shape according to the changes of the support roll and the working roll is realized. By calculating the converted roll diameter, combining the maximum and minimum roll shape quantities, a simple linear correspondence is used to calculate the real-time work roll shape quantity for early modification of the roll shape. This roll shape measurement method is edited into a computer. Each time the support roll is replaced, only the support roll and working roll diameters need to be input into the computer to calculate the matching roll shape quantity. In addition, the historical roll shape quantity data can be saved and recorded. Before replacing the support rolls, the technician inputs the roll diameter data of the new support roll and the working roll into the computer, and can pre-calculate the reasonable roll shape of the working roll, transfer the roll shape modification amount to the roll grinding operation area in advance, modify the grinding parameters to obtain the new working roll shape, and then replace the new support rolls and resume production to match the new roll shape for steel rolling production, thereby effectively improving the plate shape control stability of the finishing mill unit with weak cutting and bending roll capabilities without shifting rolls. After testing, it was found that after using the embodiment of the present invention, serious double-side waves or middle waves caused by roll shape mismatch after replacing the support rolls no longer occurred.

[0104] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0105] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0106] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0107] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including". In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0108] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for setting the roll shape of a finishing mill without a roll shifting device, characterized in that: include: When any finishing mill in the finishing rolling production line changes the backup roll, a standby backup roll and a plurality of standby working rolls are configured for the finishing mill; Determine the maximum converted roll diameter value according to the maximum support roll diameter and the maximum working roll diameter of the finishing mill in theoretical design, determine the minimum converted roll diameter value according to the minimum support roll diameter and the minimum working roll diameter of the finishing mill in theoretical design, and determine the target converted roll diameter value according to the roll diameter of the standby support roll and the roll diameters corresponding to the plurality of standby working rolls; Calculate the target working roll shape corresponding to the plurality of standby working rolls according to the following formula; Where A is the target work roll shape, in micrometers; d max is the maximum converted roller diameter, in millimeters; d min is the minimum converted roller diameter value, in millimeters; d is the target converted roller diameter value, in millimeters; A min A is the minimum limit roll shape corresponding to the working roll used when the finishing mill uses the theoretically designed minimum roll diameter support roll and working roll, in micrometers; max It is the maximum limit roll shape corresponding to the working rolls used when the finishing mill uses the backup rolls and working rolls with the maximum roll diameter designed theoretically, in micrometers; Grinding the plurality of standby work rolls according to target work roll shapes corresponding to the plurality of standby work rolls; During the operation of the standby backup roll, the plurality of standby working rolls are rotated at preset time intervals, and for the standby working rolls rotated off from the finishing mill during the operation of the standby backup roll, the rotated standby working rolls are re-ground according to the target working roll shapes corresponding to the plurality of standby working rolls, so as to be continuously rotated during the operation of the backup roll; The target work roll shape is the amount by which the diameter of the middle portion of the standby work roll after grinding is smaller than the diameter of the end portion.

2. The method for setting the roller shape of a finishing mill without a roll shifting device according to claim 1, characterized in that: The step of determining the maximum converted roll diameter value according to the theoretically designed maximum support roll diameter and the maximum working roll diameter of the finishing mill comprises: The maximum backup roll diameter and the maximum working roll diameter of the finishing mill in theoretical design are input into the following formula to obtain the maximum converted roll diameter value; Among them, d max is the maximum converted roller diameter, in millimeters; d 支max is the maximum support roll diameter of the finishing mill in theoretical design, in millimeters; d 工max is the theoretically designed maximum working roll diameter of the finishing mill, in millimeters; μ max It is the preset conversion coefficient when calculating the maximum converted roller diameter value.

3. The method for setting the roller shape of a finishing mill without a roll shifting device according to claim 1, characterized in that: The method of determining the minimum converted roll diameter value according to the theoretically designed minimum support roll diameter and the minimum working roll diameter of the finishing mill comprises: The theoretically designed minimum support roll diameter and the minimum working roll diameter of the finishing mill are input into the following formula to obtain the minimum converted roll diameter value; Among them, d min is the minimum converted roller diameter value, in millimeters; d 支min The minimum diameter of the support rolls in the theoretical design of the finishing mill, in millimeters; d 工min The minimum working roll diameter of the finishing mill in theoretical design, in millimeters; μ min It is the preset conversion coefficient when calculating the minimum converted roller diameter value.

4. The method for setting the roller shape of a finishing mill without a roll shifting device according to claim 1, characterized in that: The step of determining the target converted roll diameter value according to the roll diameter of the standby support roll and the roll diameters corresponding to the plurality of standby working rolls comprises: The average value of the roll diameters of the plurality of standby working rolls is used as the roll diameters corresponding to the plurality of standby working rolls, and the roll diameter of the standby backup roll and the roll diameters corresponding to the plurality of standby working rolls are input into the following formula to obtain a target converted roll diameter value; Wherein, d is the converted roller diameter to be used, in millimeters; d 支 is the roller diameter of the standby support roller, in millimeters; d 工 is the roller diameter corresponding to the multiple stand-by working rollers, in millimeters; μ is the preset conversion coefficient when calculating the target converted roller diameter value.

5. The method for setting the roll shape of a finishing mill without roll shifting device according to claim 2, 3 or 4, characterized in that: The range of preset conversion coefficients for calculating the maximum converted roller diameter value, the minimum converted roller diameter value and the target converted roller diameter value includes: arrive 6. The method for setting the roller shape of a finishing mill without a roll shifting device according to claim 5, characterized in that: The preset conversion coefficients for calculating the maximum converted roller diameter value, the minimum converted roller diameter value and the target converted roller diameter value are:

7. The method for setting the roll shape of a finishing mill without a roll shifting device according to claim 1, characterized in that: The minimum limit roll shape amount and the maximum limit roll shape amount are negative values, and the absolute values ​​of the minimum limit roll shape amount and the maximum limit roll shape amount of the upstream finishing mill in the finishing mill production line are respectively smaller than the absolute values ​​of the minimum limit roll shape amount and the maximum limit roll shape amount of the downstream finishing mill.

8. The method for setting the roll shape of a finishing mill without a roll shifting device according to claim 1, characterized in that: The finishing mill production line includes 6 continuous finishing mills; starting from the upstream side of the finishing mill production line, the minimum limit roll shape of the 1st to 3rd mills is -100 microns, and the maximum limit roll shape is -30 microns; the minimum limit roll shape of the 4th to 6th finishing mills is -130 microns, and the maximum limit roll shape is -60 microns.

9. The method for setting the roll shape of a finishing mill without a roll shifting device according to claim 1, characterized in that: The formula for calculating the target working roll shape of the standby working roll and the formula for calculating the maximum converted roll diameter value, the minimum converted roll diameter value and the target converted roll diameter value are edited into a computer program, and when used, the roll diameter of the standby support roll and the roll diameter corresponding to the standby working roll are input to obtain the target working roll shape corresponding to the standby working roll.

10. The method for setting the roll shape of a finishing mill without a roll shifting device according to claim 1, characterized in that: The finishing mill production line includes 6 continuous rolling finishing mills; the maximum roll diameter of the support roll of the sixth finishing mill starting from the upstream side of the finishing mill production line is 1524 mm, the minimum roll diameter of the support roll is 1374 mm, the maximum roll diameter of the working roll is 754 mm, the minimum roll diameter of the working roll is 681 mm, the minimum limit roll shape is -130 μm, the maximum limit roll shape is -60 μm, the maximum converted roll diameter value is 1712.5 mm, and the minimum converted roll diameter value is 1544.25 mm; The work roll shape of the work rolls of the sixth finishing mill from the upstream side of the finishing mill production line is calculated according to the following formula: Where A6 represents the working roll shape of the working roll of the sixth finishing mill, in microns; d 支6 Indicates the diameter of the standby support roll of the sixth finishing mill, in millimeters; d 工6 It indicates the diameter of the standby working roll of the sixth finishing mill, in millimeters.

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