CN109877167B - Tension influence coefficient analysis method for improving rolling stability of degree of freedom - Google Patents

Tension influence coefficient analysis method for improving rolling stability of degree of freedom Download PDF

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CN109877167B
CN109877167B CN201910244715.4A CN201910244715A CN109877167B CN 109877167 B CN109877167 B CN 109877167B CN 201910244715 A CN201910244715 A CN 201910244715A CN 109877167 B CN109877167 B CN 109877167B
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frame
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CN109877167A (en
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陈丹
邵健
何安瑞
王晓晨
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USTB Design and Research Institute Co Ltd
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Abstract

The invention provides a tension influence coefficient analysis method for improving the rolling stability of the degree of freedom, and belongs to the technical field of rolling process control. Firstly, acquiring a recessive relation between rolling force, tension and rolling speed, comparing the limit values of the speed by combining field practice, averagely equally dividing the limit values of the speed to obtain the equally divided speed value of each outlet frame, and further acquiring the speed value of each frame; and then calculating the rolling force corresponding to different speed points and the allowed rolling force at the highest speed, further calculating the corresponding rolling force after the front tension and the rear tension of the rack are changed, and finally calculating the influence coefficients of the front tension and the rear tension of the rack. Through a data statistical analysis method, the relationship between the tension of each rack and the rolling force is quantitatively analyzed, the tension adjustment suggestion of each rack is given, and powerful support is provided for the rolling stability of a new variety.

Description

Tension influence coefficient analysis method for improving rolling stability of degree of freedom
Technical Field
The invention relates to the technical field of rolling process control, in particular to a tension influence coefficient analysis method for improving the rolling stability of the degree of freedom.
Background
The Free Schedule Rolling technology (SFR) was first proposed in japan to break the production constraints of the Rolling Schedule by ensuring the rigid production process connections using comprehensive flexible technology. The research of the domestic free regulation rolling technology is late, and the rolling freedom degree is related to equipment capacity and process conditions and is not infinite.
In the actual production of cold continuous rolling, a cold continuous rolling production line has clear requirements on a rolling plan in order to improve the rolling stability and obtain good product quality, and in consideration of the precision of a rolling model, the self-learning efficiency, the threading rolling stability and the like, the specifications of steel types, thicknesses and widths cannot jump greatly, and transition materials except contracts need to be arranged to ensure the production of main materials. However, with the increasingly fierce market competition, small-batch and multi-specification orders are increasingly common, for production enterprises, a multi-steel-grade, multi-specification and small-batch production mode will gradually become a development trend, and at present, although free rolling in the ideal of what comes and what rolls cannot be realized, the stability of the free rolling can be improved by some specific and feasible means.
In a cold continuous rolling mill train, in a production process, tension between stands is an important rolling process parameter and plays a very important role in rolling stability, when the tension of a certain stand is constant, the relationship between rolling force and rolling speed is tight, and because the friction force between a roller and a rolling mill changes along with the change of the rolling speed and is one of the most important influencing factors of the rolling force, the rolling force also changes along with the change of the rolling speed, generally speaking, the rolling force and the rolling speed are in inverse proportion, and the larger the rolling speed is, the smaller the corresponding rolling force is within an allowable range of the rolling mill. When the variety and specification of the strip steel are changed, the low-speed rolling is adopted at the beginning because the batch production is not achieved, the rolling force of a low-speed section is often much higher than that when the high speed is stable, the overhigh rolling force is not only beneficial to the thickness control and the shape adjustment of the strip steel, but also influences the rolling stability and increases the strip breakage risk. Therefore, when the variety and the specification are changed for rolling, field operators often ensure the stability of the rolling force by adjusting the tension, but most of the adjusting methods depend on experience and do not support the adjustment theoretically, and the adjustment excessively depends on manual experience and is not beneficial to consistent production stability and product quality.
The prior literature is a lot of researches on stable rolling and tension setting, and the invention patent of a cold continuous rolling tension dynamic setting method for stable rolling (application number 201610785176.1) ensures the stable transition of rolling force in different speed intervals by dynamically setting the tension in different speed intervals, reduces the strip breakage risk in a low-speed state and ensures the stable production of a rolling mill. The invention patent of a dynamic compensation method for improving the stability of the rolling process (application number 201710899411.2) realizes the stable rolling process by dynamically compensating the front tensile stress and the rear tensile stress of a frame in the whole rolling speed range. The invention patent of a tension optimization compensation method for adjusting rolling force (application number 201410026947.X) realizes the purpose of reducing the occurrence rate of defects such as production cost increase and plate shape caused by abnormal rise of iron powder concentration to the maximum extent and ensuring the stability of the rolling process by optimally setting the tension. The above inventions have been made to compensate for the change in the speed, but they do not describe in detail the influence of the tension and the rolling force in rolling different varieties, and they do not provide clear guidance on the tension adjustment in the initial stage of rolling a new variety.
Disclosure of Invention
The invention aims to provide a tension influence coefficient analysis method for improving the rolling stability of the degree of freedom, which ensures the rolling stability at the initial stage of rolling when a new variety and a new specification are rolled on a cold continuous rolling production line.
The method comprises the following steps:
(1) the rolling force calculation model is arranged by utilizing the rolling data and the rolling theory acquired on site, and the implicit relation between the rolling force and the tension and the rolling speed is acquired, wherein the formula of the rolling force calculation model is as follows:
Figure GDA0002396337080000041
wherein Rf is rolling force, KfmIs the average deformation resistance of the strip, LcIs the contact arc length, hmIs the average thickness, T, of the stripfAnd TbRespectively forward and backward tension, W, of the stripenIs the width of the strip steel, and u is the friction coefficient;
(2) in combination with the actual situation at the site, the limit values for the speed, including the maximum permissible value VE for the installation, are comparedmaxAnd process allowable maximum value VTmaxTaking the smaller of the two as the limit value of the outlet speed
Figure GDA0002396337080000042
Then, the speed limit value is evenly divided into equal parts to obtain the speed value of each equal part of the exit rack
Figure GDA0002396337080000043
Then according to the second flow principle, the speed value of each rack is obtained
Figure GDA0002396337080000044
Namely, it is
Figure GDA0002396337080000051
Figure GDA0002396337080000052
Figure GDA0002396337080000053
Figure GDA0002396337080000054
Wherein h issIs the exit thickness of the mill, hmThe thickness of the outlet of the frame is m, and n is the number of speed points formed after equal division;
Figure GDA0002396337080000055
is the speed limit of the m gantry;
(3) calculating a model Rf (…) from the rolling force obtained in step (1), Rf ═ Rf (V, h, T)b,Tf,u,Kf,Wen,Lc) Calculating the rolling force corresponding to different speed points
Figure GDA0002396337080000056
And allowable maximum rolling force
Figure GDA0002396337080000057
Namely:
Figure GDA0002396337080000058
Figure GDA0002396337080000059
wherein: h is the thickness of the strip steel;
(4) given the amount of change in front tension of the frame
Figure GDA00023963370800000512
According to the rolling force calculation model rf (…), the corresponding rolling force after the tension change before the frame is calculated
Figure GDA00023963370800000510
Figure GDA00023963370800000511
Wherein V is the rolling speed;
(5) given rack back tension variation
Figure GDA0002396337080000061
Calculating a rolling force corresponding to the post-tension change of the stand based on a rolling force calculation model rf (…)
Figure GDA0002396337080000062
Figure GDA0002396337080000063
(6) According to rolling force at different speeds
Figure GDA0002396337080000064
Rolling force after change of front tension of frame
Figure GDA0002396337080000065
Calculating the front tension influence coefficient eff of the framei m_Rf_Tf：
Figure GDA0002396337080000066
(7) According to rolling force at different speeds
Figure GDA0002396337080000067
Post-tensioning of machine frameRolling force after force change
Figure GDA0002396337080000068
Calculating the back tension influence coefficient eff of the framei m_Rf_Tb：
Figure GDA0002396337080000069
The rolling data acquired on site in the step (1) comprises rolling speed of each stand, front and back tension of each stand, strip steel outlet thickness of each stand, strip steel width, rolling length and the like.
Coefficient of friction in step (1)
Figure GDA00023963370800000610
Wherein u is0Is a friction factor, duvIs a coefficient related to lubrication, v0For reference rolling speed, v is rolling speed, CRFor the roughness factor, R is the roll roughness, R0For reference roughness, L is the cumulative rolling length, CwTo the wear coefficient, L0The reference rolling length is used.
Average deformation resistance of the strip steel in the step (1)
Figure GDA0002396337080000071
Wherein the content of the first and second substances,
Figure GDA0002396337080000072
k0、k1、k2coefficient of resistance to deformation, hio、hi1The inlet thickness and the outlet thickness h of each frame of the strip steel0Is the thickness of the inlet of the rolling mill,
Figure GDA0002396337080000073
is the rate of deformation.
In the step (2), n is 7.
Influence coefficient eff of tension between front and back of frame in step (6) and step (7)i m_Rf_Tf、effi m_Rf_TbOutput in a log manner.
After model calculation is completed, a model calculation output log is collected, the front and rear tension influence coefficients of each rack are analyzed and sorted from mass production data, the distribution condition of the front and rear tension influence coefficients of the racks in each rack in the rolling process is given, an analysis document is formed, powerful support is provided for tension adjustment during field variety changing and specification changing rolling, and the rolling stability of the degree of freedom is improved.
The technical scheme of the invention has the following beneficial effects:
in the scheme, when the variety and the specification are changed, the speed is segmented, the influence coefficient of the rolling force and the tension corresponding to each segmentation point is calculated, the influence of the tension of each rack on the rolling force is quantified, the distribution condition of the influence factors on each rack is analyzed and counted, a tension adjustment suggestion is given, the adjustment state of the tension of each rack is conveniently and clearly known by an operator, the stable or tiny change of the rolling force is ensured when the tension is adjusted, and powerful support is provided for the stability of the free degree rolling.
By adopting the invention, in the production process of cold continuous rolling, when the rolling of plain carbon steel is changed into the rolling of high-strength steel, tension influence coefficients of different speed intervals are calculated, tension adjustment suggestions of each rack are given, the on-site rolling process is guided, the tension is pertinently adjusted in the initial stage of the rolling of the high-strength steel, so that the rolling force is kept in a stable state, and the strip breakage frequency of the rolling mill in the initial stage of the rolling is reduced from 20 times per month to less than 5 times per month.
The invention can provide powerful support for realizing the degree-of-freedom rolling of the production line and meet the customized requirements of users.
Drawings
FIG. 1 is a process flow diagram of the tension influence coefficient analysis method for improving the rolling stability of the degree of freedom according to the present invention;
FIG. 2 is a schematic diagram of "influence coefficients of inlet tension of the stand corresponding to each speed point of the steel grade 51AO 1" in the embodiment of the present invention;
FIG. 3 is a schematic diagram of "influence coefficients of the exit tension of the stand corresponding to each speed point of the steel grade 51AO 1" in the embodiment of the present invention;
FIG. 4 is a schematic diagram of "influence coefficients of inlet tension of the rack corresponding to each speed point of steel grade M3A 25" in the embodiment of the present invention;
fig. 5 is a schematic diagram of "influence coefficients of the exit tension of the stand corresponding to the speed points of the steel grade M3a 25" in the embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a tension influence coefficient analysis method for improving the rolling stability of the degree of freedom, which is characterized in that when the variety and the specification of a production line are changed and the rolling is changed, the speed is segmented, the influence coefficient of the rolling force and the tension corresponding to each segmentation point is calculated, the influence of the tension of each rack on the rolling force is quantized, the distribution condition of the influence factors in each rack is counted and analyzed, and a tension adjustment suggestion is given to improve the powerful support for stable rolling.
As shown in fig. 1, the method comprises the steps of:
the method comprises the following steps:
(1) the rolling force calculation model is arranged by utilizing the rolling data and the rolling theory acquired on site, and the implicit relation between the rolling force and the tension and the rolling speed is acquired, wherein the formula of the rolling force calculation model is as follows:
Figure GDA0002396337080000101
wherein Rf is rolling force, KfmIs the average deformation resistance of the strip, LcIs the contact arc length, hmIs the average thickness, T, of the stripfAnd TbRespectively forward and backward tension, W, of the stripenIs the width of the strip steel, and u is the friction coefficient;
(2) bonding siteIn comparison with the limit values of speed, including the maximum permissible value VE of the installationmaxAnd process allowable maximum value VTmaxTaking the smaller of the two as the limit value of the outlet speed
Figure GDA0002396337080000102
Then, the speed limit value is evenly divided into equal parts to obtain the speed value of each equal part of the exit rack
Figure GDA0002396337080000103
Then according to the second flow principle, the speed value of each rack is obtained
Figure GDA0002396337080000111
Namely, it is
Figure GDA0002396337080000112
Figure GDA0002396337080000113
Figure GDA0002396337080000114
Figure GDA0002396337080000115
Wherein h issIs the exit thickness of the mill, hmThe thickness of the outlet of the frame is m, and n is the number of speed points formed after equal division;
Figure GDA0002396337080000116
is the speed limit of the m gantry;
(3) calculating a model Rf (…) from the rolling force obtained in step (1), Rf ═ Rf (V, h, T)b,Tf,u,Kf,Wen,Lc) Calculating the rolling force corresponding to different speed points
Figure GDA0002396337080000117
And allowable maximum rolling force
Figure GDA0002396337080000118
Namely:
Figure GDA0002396337080000119
Figure GDA00023963370800001110
wherein: h is the thickness of the strip steel;
(4) given the amount of change in front tension of the frame
Figure GDA00023963370800001111
According to the rolling force calculation model rf (…), the corresponding rolling force after the tension change before the frame is calculated
Figure GDA00023963370800001112
Figure GDA00023963370800001113
Wherein V is the rolling speed;
(5) given rack back tension variation
Figure GDA0002396337080000121
Calculating a rolling force corresponding to the post-tension change of the stand based on a rolling force calculation model rf (…)
Figure GDA0002396337080000122
Figure GDA0002396337080000123
(6) According to rolling force at different speeds
Figure GDA0002396337080000124
After the front tension of the frame changesRolling force of
Figure GDA0002396337080000125
Calculating the front tension influence coefficient eff of the framei m_Rf_Tf：
Figure GDA0002396337080000126
(7) According to rolling force at different speeds
Figure GDA0002396337080000127
Rolling force after change of post-tension of stand
Figure GDA0002396337080000128
Calculating the back tension influence coefficient eff of the framei m_Rf_Tb：
Figure GDA0002396337080000129
Coefficient of friction in step (1)
Figure GDA00023963370800001210
Wherein u is0Is a friction factor, duvIs a coefficient related to lubrication, v0For reference rolling speed, v is rolling speed, CRFor the roughness factor, R is the roll roughness, L0For reference roughness, L is the cumulative rolling length, CwTo the wear coefficient, L0The reference rolling length is used.
Average deformation resistance of the strip steel in the step (1)
Figure GDA0002396337080000131
Wherein the content of the first and second substances,
Figure GDA0002396337080000132
k0、k1、k2coefficient of resistance to deformation, hio、hi1The inlet thickness and the outlet thickness h of each frame of the strip steel0Is the thickness of the inlet of the rolling mill,
Figure GDA0002396337080000133
is the rate of deformation.
Influence coefficient eff of tension between front and back of frame in step (6) and step (7)i m_Rf_Tf、effi m_Rf_TbOutput in a log manner.
In the following, a specific cold continuous rolling production line is taken as an example, the product of the production line mainly focuses on high-grade automobile plates and household electric plates, the total installed capacity is 34090kW, and the maximum rolling outlet speed is 1400 m/min. The raw material materials are hot-rolled low-carbon steel, ultra-low-carbon steel (IF steel), low-alloy high-strength steel and the like, the thickness range of the raw materials is 1.60-6.00 mm, and the width of the raw materials is as follows: 800-1900 mm, and the thickness range of the product is 0.2-2.5 mm; the width range of the raw material is 800 mm-1870 mm. The continuous rolling process section consists of five-rack tandem cold continuous rolling mills of Simon, adopts six-roller CVC and can perform intermediate roller shifting, intermediate roller bending and working roller bending; the tension control system of the production line is Siemens TDC, and ABB tension detecting instruments are arranged at the front and the rear of each rack.
With the increasing market competition, in order to further compress finished products and improve the spare capacity of a unit and adapt to the production trend of small batches and multiple specifications, a new variety, such as high-strength steel, is rolled on the production line, and the invention mainly takes the high-strength steels M3A25 and 51AO1 as examples and provides theoretical support for tension adjustment during rolling to avoid overlarge rolling force change.
The method comprises the following steps: and calculating the rolling force, tension and rolling speed of each stand of the steel grades M3A25 and 51AO1 by using the rolling data and the process calculation model acquired on site.
The PDI data of the steel grades M3A25 and 51AO1 are shown in the following table.
Steel grade/coil number Thickness of raw material (mm) Finished product thickness (mm) Finished product width (mm)
M3A25/1620293321040 3.430 1.000 1289
51AO1/1630410622030 3.420 1.440 1249
Model calculation data for steel grade M3a25 is shown in the table below.
M3A25 1# 2# 3# 4# 5# An outlet
Rolling power (KN) 18819 14021 12713 12891 9006
Tension (N/mm2) 50 130 155 175 185 50
Rolling speed (m/min) 434 612 845 1096 1108
Model calculation data for steel grade 51AO1 are shown in the following table.
Figure GDA0002396337080000141
Figure GDA0002396337080000151
And step two, comparing the maximum process speed and the maximum equipment speed of the outlet of the 5# rack by taking steel types M3A25 and the 5# rack as examples according to the actual working conditions on site, giving the maximum speed for speed division according to the patent, dividing the speed according to an equal division mode, and equally dividing the speed into 7 parts to form 8 speed points.
Figure GDA0002396337080000152
Figure GDA0002396337080000153
According to the above formula, the speed of each dividing point of the 5# rack is calculated as follows:
the 8 th speed point is
Figure GDA0002396337080000154
The 7 th speed point is
Figure GDA0002396337080000155
The 6 th speed point is
Figure GDA0002396337080000156
The 5 th speed point is
Figure GDA0002396337080000157
The 4 th speed point is
Figure GDA0002396337080000158
The 3 rd speed point is
Figure GDA0002396337080000159
The 2 nd speed point is
Figure GDA00023963370800001510
The 1 st speed point is
Figure GDA0002396337080000161
Step three: according to the calculated speed value of the speed point, the rolling force corresponding to each speed point is calculated through a rolling force model by using the original data and the model constant of the steel type M3A25 strip steel
Figure GDA0002396337080000162
The rolling force corresponding to the 8 th speed point is
Figure GDA0002396337080000163
The rolling force corresponding to the 7 th speed point is
Figure GDA0002396337080000164
The rolling force corresponding to the 6 th speed point is
Figure GDA0002396337080000165
The rolling force corresponding to the 5 th speed point is
Figure GDA0002396337080000166
The rolling force corresponding to the 4 th speed point is
Figure GDA0002396337080000167
The rolling force corresponding to the 3 rd speed point is
Figure GDA0002396337080000168
The rolling force corresponding to the 2 nd speed point is
Figure GDA0002396337080000169
The rolling force corresponding to the 1 st speed point is
Figure GDA00023963370800001610
Step four, giving the variable quantity of the front tension of each rack
Figure GDA00023963370800001611
The variation is 8 percent of the tension before the outlet of the No. 5 stand, and the rolling force corresponding to the tension variation before each stand is calculated
Figure GDA00023963370800001612
And the value of the rolling force corresponding to the previous speed point
Figure GDA00023963370800001613
According to the formula of the front tension influence coefficient, calculating the influence coefficient of the front tension of the No. 5 frame
Figure GDA00023963370800001614
According to the same steps, the influence coefficient of the rear tension of the No. 5 frame is calculated
Figure GDA00023963370800001615
As shown in the following table:
Figure GDA0002396337080000171
step five: according to the above steps, the front and rear tension influence coefficients of the other stands (1#, 2#, 3#, 4#) are calculated, and the calculated front and rear tension influence coefficients of each stand are respectively plotted into line graphs with marks, fig. 2 and 3 are trend graphs of the inlet tension influence coefficient and the outlet tension influence coefficient of each stand of high-strength steel M3a25, and fig. 4 and 5 are trend graphs of the inlet tension influence coefficient and the outlet tension influence coefficient of each stand of high-strength steel 51AO 1.
As is clear from the above trend chart, the influence of the entry tension adjustment of the 1# stand on the rolling force is the largest and the influence of the entry tension adjustment of the 4# stand on the rolling force is the smallest for the entry tension, so if the entry tension adjustment is performed to ensure the smoothness of the rolling force, the entry tension of the 4# stand can be selected to be adjusted to avoid the adjustment of the entry tension of the 1# stand. Similarly, for the exit tension, the exit tension adjustment of the 1# stand and the 4# stand has a great influence on the rolling force, and the exit tension adjustment of the 2# stand has a small influence on the rolling force, so if the exit tension adjustment is performed to ensure the smoothness of the rolling force, the exit tension of the 2# stand can be selectively adjusted to avoid adjusting the exit tension of the 1# stand and the 4# stand.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (6)

1. A tension influence coefficient analysis method for improving the rolling stability of the degree of freedom is characterized in that: the method comprises the following steps:
(1) the rolling force calculation model is arranged by utilizing the rolling data and the rolling theory acquired on site, and the implicit relation between the rolling force and the tension and the rolling speed is acquired, wherein the formula of the rolling force calculation model is as follows:
Figure FDA0002396337070000011
wherein Rf is rolling force, KfmIs the average deformation resistance of the strip, LcIs the contact arc length, hmIs the average thickness, T, of the stripfAnd TbRespectively forward and backward tension, W, of the stripenIs the width of the strip steel, and u is the friction coefficient;
(2) in combination with the actual situation at the site, the limit values for the speed, including the maximum permissible value VE for the installation, are comparedmaxAnd process allowable maximum value VTmaxTaking the smaller of the two as the limit value of the outlet speed
Figure FDA0002396337070000012
Then, the speed limit value is evenly divided into equal parts to obtain the speed value V of each equal part of the exit racki 5Then according to the second flow principle, the speed value of each machine frame is obtained
Figure FDA0002396337070000013
Namely, it is
Figure FDA0002396337070000014
Figure FDA0002396337070000021
Figure FDA0002396337070000022
Figure FDA0002396337070000023
Wherein h is5Is the exit thickness of the mill, hmThe thickness of the outlet of the frame is m, and n is the number of speed points formed after equal division;
Figure FDA0002396337070000024
is the speed limit of the m gantry;
(3) based on the rolling force calculation model determined in step (1), Rf ═ Rf (V, h, T) in combination with the speed valueb,Tf,u,Kf,Wen,Lc) Calculating the rolling force corresponding to different speed points
Figure FDA0002396337070000025
And allowable maximum rolling force
Figure FDA0002396337070000026
Namely:
Figure FDA0002396337070000027
Figure FDA0002396337070000028
wherein: h is the thickness of the strip steel;
(4) given the amount of change in front tension of the frame
Figure FDA0002396337070000029
According to the rolling force calculation model, the corresponding rolling force after the tension change before the frame is calculated
Figure FDA00023963370700000210
Figure FDA00023963370700000211
Wherein V is the rolling speed;
(5) given rack back tension variation
Figure FDA00023963370700000212
According to the rolling force calculation model, the corresponding rolling force after the tension change behind the frame is calculated
Figure FDA0002396337070000031
Figure FDA0002396337070000032
(6) According to rolling force at different speeds
Figure FDA0002396337070000033
Rolling force after change of front tension of frame
Figure FDA0002396337070000034
Calculating the front tension influence coefficient eff of the framei m_Rf_Tf：
Figure FDA0002396337070000035
(7) According to rolling force at different speeds
Figure FDA0002396337070000036
Rolling force after change of post-tension of stand
Figure FDA0002396337070000037
Calculating the back tension influence coefficient eff of the framei m_Rf_Tb：
Figure FDA0002396337070000038
2. The tension influence coefficient analysis method for improving rolling stability in degrees of freedom according to claim 1, characterized in that: and (2) the rolling data acquired on site in the step (1) comprises the rolling speed of each rack, the front and back tension of each rack, the strip steel outlet thickness of each rack, the strip steel width and the rolling length.
3. The tension influence coefficient analysis method for improving rolling stability in degrees of freedom according to claim 1, characterized in that: coefficient of friction in the step (1)
Figure FDA0002396337070000039
Wherein u is0Is a friction factor, duvIs a coefficient related to lubrication, v0For reference rolling speed, v is rolling speed, CRFor the roughness factor, R is the roll roughness, R0For reference roughness, L is the cumulative rolling length, CwTo the wear coefficient, L0The reference rolling length is used.
4. The tension influence coefficient analysis method for improving rolling stability in degrees of freedom according to claim 1, characterized in that: average deformation resistance of the strip steel in the step (1)
Figure FDA0002396337070000041
Wherein the content of the first and second substances,
Figure FDA0002396337070000042
k0、k1、k2coefficient of resistance to deformation, hio、hi1The inlet thickness and the outlet thickness h of each frame of the strip steel0Is the thickness of the inlet of the rolling mill,
Figure FDA0002396337070000043
is the rate of deformation.
5. The tension influence coefficient analysis method for improving rolling stability in degrees of freedom according to claim 1, characterized in that: in the step (2), n is 7.
6. The tension influence coefficient analysis method for improving rolling stability in degrees of freedom according to claim 1, characterized in that: the influence coefficient eff of the front and rear tension of the frame in the step (6) and the step (7)i m_Rf_Tf、effi m_Rf_TbOutput in a log manner.
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