CN113909308B - Symmetrical adjustment method for roll gap of hot continuous rolling mill - Google Patents

Symmetrical adjustment method for roll gap of hot continuous rolling mill Download PDF

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CN113909308B
CN113909308B CN202111187721.4A CN202111187721A CN113909308B CN 113909308 B CN113909308 B CN 113909308B CN 202111187721 A CN202111187721 A CN 202111187721A CN 113909308 B CN113909308 B CN 113909308B
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roll
rolling
leveling
roll gap
value
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CN113909308A (en
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何海楠
王晓晨
徐冬
杨荃
闫书宗
丁吉杰
周杰
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University of Science and Technology Beijing USTB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control

Abstract

The invention provides a symmetrical adjusting method for a roll gap of a hot continuous rolling mill, and belongs to the technical field of plate strip rolling. The method comprises the steps of firstly, carrying out a zero adjustment process of a roller, adjusting the pressure drop of two sides of the roller after the roller of a working roller is changed or equipment is overhauled, and finishing the zero adjustment when the pressure difference of two sides of a rolling mill is detected to be smaller than a given value; then reading the rolling force value before the roll zero adjustment is successful and the pressure unloading; then calculating a roll gap pre-swing leveling value; and finally, determining a roll gap and calculating a leveling compensation value. The method is suitable for constructing a roll gap symmetry adjustment model of each frame of a finishing mill group through actual leveling data in a mill zero adjustment process and a steel rolling process after parts of a finishing mill, such as working rolls, supporting rolls and the like, which influence the change of the integral rigidity of equipment, are replaced. The method adjusts the roll gap inclination of the rolling mill according to the calibration data of the finishing mill group so as to keep symmetry along the loaded roll gaps on the two sides of the strip steel during steel rolling and ensure that the strip steel keeps symmetrical rolling in the finishing rolling process.

Description

Symmetrical adjustment method for roll gap of hot continuous rolling mill
Technical Field
The invention relates to the technical field of strip rolling, in particular to a symmetrical adjusting method for a roll gap of a hot continuous rolling mill.
Background
Hot rolled strip is an important steel product and hot continuous rolling is one of the main ways of producing hot rolled strip. The hot continuous rolling production line mainly comprises a heating furnace, a rough rolling mill, a finishing mill, a laminar cooling device and a coiler, wherein the finishing mill comprises a plurality of finishing mill frames, and in the hot continuous rolling production line, the finishing mill comprises finishing mill frames F1-F7. The production process of the hot continuous rolling production line comprises the following steps: firstly, heating a blank by a heating furnace, then removing phosphorus by high-pressure water, then roughly rolling by a rough rolling mill, then cutting the head and the tail, finely rolling by a finish rolling mill, then carrying out laminar cooling by a laminar cooling device, and finally coiling by a coiling machine to obtain a finished product of the hot-rolled strip steel.
After the roll of the hot rolling finishing mill is changed, the leveling of the finishing mill is an important link for initializing the finishing mill. The method for pre-swinging and leveling after roll changing by rolling according to the traditional method not only can not meet the production requirement, but also has the risks of deviation of the head of the strip steel, scrap steel and the like. Therefore, when the finishing mill starts rolling, an operator needs to perform pre-swing leveling on the roll gap according to experience. The risk of instability of the manually preset empirical values, however, reduces the rolling stability.
The method for presetting the roll gap of the rolling mill in the prior art publication cannot accurately consider precision deviation caused by equipment replacement, abrasion and matching, the leveling precision is relatively good, frequent equipment part replacement needs to be added, and high production cost is caused.
In the prior art, a roll gap pre-swing leveling method comprises the steps of operating the same steel type in the same planning period, recording the roll gap value of the steel type leveling operation by an operator through a primary control system, and then overlapping the roll gap value with a secondary issued set roll gap to generate a new waiting roll gap so that the roll gap is in an equivalent parallel state to perform pre-swing leveling of the roll gap.
In the prior art, a method for accurately calibrating a rough rolling horizontal roll gap is roughly as follows: d1 dynamically pressing against the working roller for the first time until the calibrated rolling force F is achieved, and eliminating the equipment gap; d2 dynamically pressing the working roll for the second time to a calibrated rolling force F mark, and confirming that the rolling force deviation of the working roll meets the range; d3 static copper bar pressing calibration and leveling of a horizontal roll gap; d4 dynamically pressing the working roll for the third time until the calibrated rolling force F is marked, and eliminating the bounce of the roll; and D5, clearing the roll gap, lifting the working roll, finishing the calibration process and normally carrying out rolling production. The technology considers the state of the roughing mill under the real production condition, utilizes the advanced dynamic pressing before calibration to eliminate the adverse effects of roller bounce and rolling mill clearance on the calibration precision to the maximum extent; meanwhile, a rolling force deviation leveling idea is introduced, and leveling is comprehensively carried out by utilizing a method of combining copper bar pressing leveling and calibrated rolling force deviation compensation, so that the roll gap level of the rolling mill under normal load production is comprehensively improved. However, this method requires a lot of additional equipment, which makes the operation cumbersome and costly.
Disclosure of Invention
The invention aims to provide a symmetrical adjusting method for a roll gap of a hot continuous rolling mill.
The method comprises the following steps:
s1: starting a zero adjustment process of the roller:
after the equipment state of the finishing mill group is obviously changed, carrying out a zero calibration process on the roller, adjusting the pressure drop of the two sides, and finishing the calibration process when detecting that the pressure difference of the two sides of the roller is less than a given value;
s2: the roll was zero-adjusted successfully and the rolling force values were read before pressure unloading:
after the zero-marking process is finished in S1, the actual measurement values of the two side pressure heads and the oil pressure sensor at the time of successful zero-setting are read before pressure unloading, and are respectively recorded as:
FOS_LC-rolling mill operating side ram reading;
FDS_LC-rolling mill drive side ram reading;
FOS_PT-rolling mill operating side oil pressure sensor readings;
FDS_PT-rolling mill drive side oil pressure sensor readings;
s3: calculating a roll gap pre-swing leveling value:
after successful calibration, the current frame pre-swing leveling value SiComprises the following steps:
Si＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔSi
wherein alpha is a pre-control leveling influence coefficient and the value range is [10 ]-4,10-3](ii) a k is weight coefficient and takes the value range of [0,1 ]]；ΔSiPre-leveling compensation coefficients; i represents the ith roll change;
the specific value of the correlation coefficient is determined according to field experience.
The specific calculation process in S3 is as follows:
Determining a roll gap calculation leveling compensation value:
the leveling compensation value used for calculating the roll gap pre-swing leveling value after each roll change of the working roll is calculated by the pre-swing leveling value after the previous roll change of the working roll and the actual leveling value after stable rolling in the supporting roll period;
after the front frame supporting roll is changed and the logo on the 1 st working roll is zero, the roll gap leveling value S is adjusted1Comprises the following steps:
S1＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS1
wherein, Δ S1＝0；
Usually, after each roll change, 3-5 pieces of steel before the initial rolling are hot roll materials, so that the temperature of the rolls is increased to establish the thermal crown, meanwhile, the hot crown is adjusted to be more appropriate process parameters, and the current leveling value is S when the 3 rd piece of steel after the roll change is rolled and the threading is finished is read on a human-computer interaction interface of a finish rolling operation platformi_dyn3；
After the zero mark is arranged on the 2 nd set of working rolls, the roll gap leveling value S2Comprises the following steps:
S2＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS2
wherein, Δ S2Calculated from the following formula:
ΔS2＝β1(S1_dyn3-S1)
wherein, beta1The roll gap compensation attenuation coefficient for the roll change of the 2 nd working roll is taken as value [0, 1%]；S1_dyn3Reading a current leveling value when the 3 rd steel threading is finished after the 1 st roll change on a human-computer interaction interface of a finish rolling operation platform;
after the zero mark is arranged on the 3 rd set of working rolls, the roll gap leveling value S3Comprises the following steps:
S3＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS3
wherein, Delta S3Calculated from the following formula:
ΔS3＝β2(S2_dyn3-S2)+(1-β2)ΔS2
wherein, beta2The roll gap compensation attenuation coefficient for the roll change of the 3 rd set of working rolls is calculated by taking beta 2＝β1；S2_dyn3Reading a current leveling value when the 3 rd steel threading is finished after the 2 nd roll change on a human-computer interaction interface of a finish rolling operation platform;
after the mark on the ith set of working roller is zero, the roll gap leveling value SiComprises the following steps:
Si＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔSi
wherein, Delta SiCalculated from the following formula:
ΔSi＝β3(Si-1_dyn3-S3)+(β2-β3)ΔSi-1+(1-β2)ΔSi-2
wherein, beta3Compensating attenuation coefficient for the roll gap of the ith working roll, wherein the value range is [0,1 ]]，i≥4，Si-1_dyn3Reading a current leveling value when the threading of the 3 rd steel is finished after the roll is changed for the (i-1) th time on a human-computer interaction interface of a finish rolling operation platform;
and (4) calculating a roll gap pre-swing leveling compensation value after the ith working roll change according to the steps until the supporting roll of the frame is changed, and returning to S1 to restart the calculation.
Wherein, the obvious change of the equipment state in S1 comprises supporting roll changing, working roll changing, equipment overhaul and the like.
When the zero adjustment is successful in S2, the sum of the bilateral rolling forces reaches the set rolling force F.
In the method, a finishing mill group is respectively provided with a pressure head and an oil pressure sensor at two sides of a roller.
The method adopts roll calibration data and leveling measured data during strip steel rolling to construct a roll gap symmetry adjustment model of each frame of the finishing mill group, and is used for adjusting roll gap inclination of each frame of the finishing mill group after roll change calibration of a working roll, so as to ensure that the hot rolled strip steel can smoothly complete threading and keep stable rolling.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the roll gap pre-leveling value required in the roll gap steel rolling process is calculated through the measured values of the pressure head and the oil pressure sensor in the rolling mill calibration process, the equipment rigidity characteristic in the roll changing period of a single supporting roll is considered, and the roll gap pre-leveling compensation value is combined, so that the roll gap pre-leveling value after each roll changing can be accurately given, the safety, the reliability and the stability of the strip steel threading process are ensured, the rolling plate shape precision of the strip steel head is ensured, and the bending of the strip steel head and the single-side wave shape are effectively relieved. The main characteristics are as follows: 1. accurately calculating a roll gap pre-leveling value during rolling of the strip steel through a pressure head in the calibration process of the finish rolling four-high mill and a pressure value detected by an oil pressure sensor; 2. the roll gap inclination caused by equipment fit clearance, contact surface abrasion and asymmetric rigidity of two sides can be accurately compensated, and the plate shape quality of the head of the threading strip steel in the process is ensured; 3. the self-adaptive adjustment of the roll gap can be timely made to the change of the equipment condition in the steel rolling process in real time, and the pre-swing leveling value is compensated.
Drawings
FIG. 1 is a flow chart of the symmetrical roll gap adjusting method of the hot continuous rolling mill of the invention;
FIG. 2 is a diagram of a deviation rectifying detection and automatic control system for hot continuous rolling finishing rolling applied in the embodiment of the 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 symmetrical adjusting method for a roll gap of a hot continuous rolling mill.
As shown in fig. 1, the method comprises the steps of:
s1: starting a zero adjustment process of the roller:
after the equipment state of the finishing mill group is obviously changed, carrying out a zero calibration process on the roller, adjusting the pressure drop of the two sides, and finishing the calibration process when detecting that the pressure difference of the two sides of the roller is less than a given value;
s2: the roll was zero-adjusted successfully and the rolling force values were read before pressure unloading:
after the zero-marking process is finished in S1, the actual measurement values of the two side pressure heads and the oil pressure sensor at the time of successful zero-setting are read before pressure unloading, and are respectively recorded as:
FOS_LC-rolling mill operating side ram reading;
FDS_LC-rolling mill drive side ram reading;
FOS_PT-rolling mill operating side oil pressure sensor readings;
FDS_PT-rolling mill drive side oil pressure sensor readings;
s3: calculating a roll gap pre-swing leveling value:
after successful calibration, the current frame pre-swing leveling value SiComprises the following steps:
Si＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔSi
wherein alpha is a pre-control leveling influence coefficient and the value range is [10 ]-4,10-3](ii) a k is weight coefficient and takes the value range of [0,1 ] ]；ΔSiPre-leveling compensation coefficients; i represents the ith roll change;
the specific calculation process in S3 is as follows:
determining a roll gap calculation leveling compensation value:
the calculated leveling compensation value used for calculating the roll gap pre-swing leveling value after each roll change of the working roll is calculated by the pre-swing leveling values of the working roll changes for the first times in the period of the supporting roll and the actual leveling value after stable rolling;
after the front frame supporting roll is changed and the mark on the 1 st working roll is zero, the roll gap leveling value S1Comprises the following steps:
S1＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS1
wherein, Delta S1＝0；
Usually, after each roll change, 3-5 pieces of steel before the initial rolling are hot roll materials, so that the temperature of the rolls is increased to establish the thermal crown, meanwhile, the hot crown is adjusted to be more appropriate process parameters, and the current leveling value is S when the 3 rd piece of steel after the roll change is rolled and the threading is finished is read on a human-computer interaction interface of a finish rolling operation platformi_dyn3；
After the zero mark is arranged on the 2 nd set of working rolls, the roll gap leveling value S2Comprises the following steps:
S2＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS2
wherein, Delta S2Calculated from the following formula:
ΔS2＝β1(S1_dyn3-S1)
wherein, beta1For the roll gap compensation attenuation coefficient of the 2 nd set of working roll, taking beta2＝β1；S1_dyn3Reading a current leveling value when the 3 rd steel threading is finished after the 1 st roll change on a human-computer interaction interface of a finish rolling operation platform;
after the zero mark is arranged on the 3 rd set of working rolls, the roll gap leveling value S3Comprises the following steps:
S3＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS3
wherein, Delta S3Calculated from the following formula:
ΔS3＝β2(S2_dyn3-S2)+(1-β2)ΔS2
Wherein beta is2Roll gap compensation attenuation coefficient for the 3 rd set of working rolls2_dyn3Reading a current leveling value when the 3 rd steel threading is finished after the 2 nd roll change on a human-computer interaction interface of a finish rolling operation platform;
after the mark on the ith set of working roll is zero, the roll gap leveling value SiComprises the following steps:
Si＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔSi
wherein, Delta SiCalculated from the following formula:
ΔSi＝β3(Si-1_dyn3-S3)+(β2-β3)ΔSi-1+(1-β2)ΔSi-2
wherein, beta3Changing rolls for the i-th set of working rollsThe value range of the seam compensation attenuation coefficient is [0,1 ]]，i≥4，Si-1_dyn3Reading a current leveling value when the threading of the 3 rd steel is finished after the roll is changed for the (i-1) th time on a human-computer interaction interface of a finish rolling operation platform;
and (4) calculating a roll gap pre-swing leveling compensation value after the ith working roll change according to the steps until the supporting roll of the frame is changed, and returning to S1 to restart the calculation.
In a specific application process, according to the steps, roll gap adjustment is started by referring to a certain 2250 hot continuous rolling finishing mill group F1 stand.
After the supporting roll and the working roll are repaired and repaired every cycle, the finishing mill group F1 machine frame carries out equipment recovery operation and starts roll calibration, pressure heads (LC) detect pressure on two sides as calibration reference, the roll undergoes a rapid screw-down process, the pressure on one side is increased from 0 to pressure on two sides and reaches F15000 KN, loading is stopped at the moment, the pressure on two sides is adjusted, and the calibration process is finished when the pressure difference on two sides of the rolling mill is detected to be less than 300 KN.
1 st working roll change in the supporting roll period:
the actual measurement values of the pressure heads and the pressure sensors on the two sides when the zero adjustment is successful are respectively as follows:
Figure BDA0003299957360000061
Figure BDA0003299957360000071
after successful calibration, the current frame pre-swing leveling value SiComprises the following steps:
Si＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔSi
wherein, the first and the second end of the pipe are connected with each other,
the values of the pre-control leveling influence coefficient alpha are shown in the following table;
f1 rack F2 rack F3 rack F4 rack F5 rack F6 rack F7 rack
0.0004 0.0004 0.0004 0.0004 0.0003 0.0002 0.0001
Correspondingly, for the F1 frame, the value of alpha is 0.0004, the weight coefficient k is 0.2, and delta S1When the value is 0, then:
S1＝0.0004×[0.2×(8241-8515)+0.8×(8008-7004)]+0＝0.30
after the working roll is changed for the 1 st time, the current leveling value is S when the 3 rd steel after the roll change is rolled and the threading is finished is read on the human-computer interaction interface of the finish rolling operation platform1_dyn3＝0.17。
The 2 nd working roll change in the supporting roll period:
the measured values of the pressure heads and the pressure sensors on the two sides when the zero adjustment is successful are respectively as follows:
Figure BDA0003299957360000072
ΔS2calculated from the following formula:
ΔS2＝0.8×(0.17-0.299)＝-0.104
wherein the roll gap compensation attenuation coefficient beta1The value is 0.8.
After successful calibration, the current frame pre-swing leveling value S2Comprises the following steps:
S2＝0.0004×[0.2×(7472-7595)+0.8×(6683-6232)]-0.104＝0.03
after the 2 nd working roll change, reading the 3 rd steel threading end after the roll change on a human-computer interaction interface of a finish rolling operation platform, wherein the current leveling value is S2_dyn3＝0.11。
The 3 rd working roll change in the supporting roll period:
the measured values of the pressure heads and the pressure sensors on the two sides when the zero adjustment is successful are respectively as follows:
Figure BDA0003299957360000073
ΔS3Calculated from the following formula:
ΔS3＝0.8×(0.11-0.03)+0.2×(-0.104)＝0.043
wherein the roll gap compensation attenuation coefficient beta2The value is 0.8.
After successful calibration, the current frame pre-swing leveling value S3Comprises the following steps:
S3＝0.0004×[0.2×(7608-7866)+0.8×(6638-6866)]+0.043＝-0.051
after the 3 rd working roll change, the current leveling value is S when the 3 rd steel threading is finished after the roll change is read on the human-computer interaction interface of the finish rolling operation platform2_dyn3＝0.02。
The 4 th working roll change in the supporting roll period:
the measured values of the pressure heads and the pressure sensors on the two sides when the zero adjustment is successful are respectively as follows:
Figure BDA0003299957360000081
ΔS4calculated from the following formula:
ΔS4＝0.5×p0.02-(-0.051)]+0.3×0.043+0.2×(-0.104)＝0.018
wherein the roll gap compensation attenuation coefficient beta3The value is 0.5.
After successful calibration, the current frame pre-swing leveling value S3Comprises the following steps:
S4＝0.0004×p0.2×(7523-7778)+0.8×(6852-7446)]+0.018＝-0.192
according to the steps, the roll gap pre-swing leveling compensation value after the 5 th working roll change can be calculated until the roll change of the supporting roll of the frame is finished, and the calculation is restarted.
After the roll gap leveling method of the hot continuous rolling mill is applied to a finish rolling measurement and control automatic deviation correcting system (refer to an attached figure 2) of a 2250mm hot continuous rolling unit for large-scale industrial application, a very obvious strip steel head deviation control effect is obtained. According to the strip steel measurement data of the detection instrument between the racks, the deviation value of the strip steel head of each rack can be controlled within +/-30 mm, the qualification rate of deviation of the F7 outlet head within +/-20 mm can reach more than 90 percent, and steel piling accidents caused by overlarge camber and the like when the head penetrates through the strip steel can not occur after the method is applied.
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 (4)

1. A symmetrical roll gap adjusting method for a hot continuous rolling mill is characterized by comprising the following steps: the method comprises the following steps:
s1: starting a zero adjustment process of the roller:
after the equipment state of the finishing mill group is obviously changed, carrying out a zero calibration process on the roller, adjusting the pressure drop of the two sides, and finishing the calibration process when detecting that the pressure difference of the two sides of the roller is less than a given value; wherein, the obvious change of the equipment state comprises the roll change of a supporting roll, the roll change of a working roll and the overhaul of the equipment;
s2: the roll was zero-adjusted successfully and the rolling force values were read before pressure unloading:
after the zero-marking process is finished in S1, the actual measurement values of the two side pressure heads and the oil pressure sensor at the time of successful zero-setting are read before pressure unloading, and are respectively recorded as:
FOS_LC-rolling mill operating side ram reading;
FDS_LC-rolling mill drive side ram reading;
FOS_PT-rolling mill operating side oil pressure sensor readings;
FDS_PT-rolling mill drive side oil pressure sensor readings;
S3: calculating a roll gap pre-swing leveling value:
after successful calibration, the current frame pre-swing leveling value SiComprises the following steps:
Si＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔSi
wherein alpha is a pre-control leveling influence coefficient and the value range is [10 ]-4,10-3](ii) a k is weight coefficient and takes the value range of [0,1 ]]；ΔSiPre-leveling compensation coefficients; i represents the ith roll change;
the specific calculation process in S3 is as follows:
the pre-leveling compensation coefficient used for calculating the roll gap pre-swing leveling value after each roll change of the working roll is calculated by the pre-swing leveling values of the working roll changes for the first times in the period of the supporting roll and the actual leveling value after stable rolling;
after the front frame supporting roll is changed and the mark on the 1 st working roll is zero, the roll gap leveling value S1Comprises the following steps:
S1＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS1
wherein, Delta S1＝0；
After each roll change3-5 pieces of steel before initial rolling are hot rolling materials so as to facilitate the heating of the roller to establish the thermal crown, meanwhile, the hot crown is adjusted to be more appropriate technological parameters, and the current leveling value is S when the 3 rd piece of steel after the ith roller change is rolled and the threading is finished is read on a human-computer interaction interface of a finish rolling operation platformi_dyn3；
After the zero mark is arranged on the 2 nd set of working rolls, the roll gap leveling value S2Comprises the following steps:
S2＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS2
wherein, Delta S2Calculated from the following formula:
ΔS2＝β1(S1_dyn3-S1)
wherein, beta1The roll gap compensation attenuation coefficient for the roll change of the 2 nd working roll is taken as value [0, 1%]；S1_dyn3Reading a current leveling value when the 3 rd steel threading is finished after the 1 st roll change on a human-computer interaction interface of a finish rolling operation platform;
After the 3 rd set of working rolls are provided with zero marks, the roll gap leveling value S3Comprises the following steps:
S3＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔS3
wherein, Delta S3Calculated from the following formula:
ΔS3＝β2(S2_dyn3-S2)+(1-β2)ΔS2
wherein, beta2The roll gap compensation attenuation coefficient for the roll change of the 3 rd set of working rolls is calculated by taking beta2＝β1；S2_dyn3Reading a current leveling value when the 3 rd steel threading is finished after the 2 nd roll change on a human-computer interaction interface of a finish rolling operation platform;
after the mark on the ith set of working roller is zero, the roll gap leveling value SiComprises the following steps:
Si＝αk(FOS_LC-FDS_LC)+α(1-k)(FOS_PT-FDS_PT)+ΔSi
wherein, Delta SiCalculated from the following formula:
ΔSi＝β3(Si-1_dyn3-S3)+(β2-β3)ΔSi-1+(1-β2)ΔSi-2
wherein, beta3Compensating attenuation coefficient for the roll gap of the ith working roll, wherein the value range is [0,1 ]]，i≥4，Si-1_dyn3And reading a current leveling value when the threading of the 3 rd steel is finished after the roll is changed for the (i-1) th time on a human-computer interaction interface of a finish rolling operation platform.
2. The symmetrical roll gap adjusting method of the hot continuous rolling mill according to claim 1, characterized in that: and calculating the roll gap pre-swing leveling compensation value after the ith roll change of the working roll according to S1-S3, returning to S1 to restart the calculation until the support roll of the machine frame is changed.
3. The symmetrical roll gap adjusting method of the hot continuous rolling mill according to claim 1, characterized in that: when the zero adjustment is successful in S2, the sum of the bilateral rolling forces reaches the set rolling force F.
4. The symmetrical roll gap adjusting method of the hot continuous rolling mill according to claim 1, characterized in that: and the finishing mill group is provided with a pressure head and an oil pressure sensor on two sides of the roller respectively.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5086399A (en) * 1988-09-20 1992-02-04 Kabushiki Kaisha Toshiba Method and apparatus for setting-up rolling mill roll gaps
JPH06142737A (en) * 1992-10-30 1994-05-24 Kawasaki Steel Corp Roller for compensating asymmetric rolling
CN101318202A (en) * 2008-06-26 2008-12-10 湖南华菱涟源钢铁有限公司 Zero positioning method for roller gap of stand-alone frame of roller mill
WO2011038964A1 (en) * 2009-09-29 2011-04-07 Siemens Aktiengesellschaft Method for the model-based determination of actuator nominal values for the symmetric and asymmetric actuators of the roll stands of a hot wide strip mill
CN103252350A (en) * 2012-02-17 2013-08-21 宝山钢铁股份有限公司 Leveling method for finishing mill after roller changing
CN104070072A (en) * 2013-03-27 2014-10-01 宝山钢铁股份有限公司 Leveling method for zero-adjustment rolling roll gaps of working rolls
CN108284136A (en) * 2018-01-19 2018-07-17 山东钢铁集团日照有限公司 A method of improving finishing mill roll gap stated accuracy
CN109877165A (en) * 2019-04-10 2019-06-14 北京科技大学设计研究院有限公司 A kind of automatic acyclic homologically trioial method containing roll neck compensating for variations after roll change

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5086399A (en) * 1988-09-20 1992-02-04 Kabushiki Kaisha Toshiba Method and apparatus for setting-up rolling mill roll gaps
JPH06142737A (en) * 1992-10-30 1994-05-24 Kawasaki Steel Corp Roller for compensating asymmetric rolling
CN101318202A (en) * 2008-06-26 2008-12-10 湖南华菱涟源钢铁有限公司 Zero positioning method for roller gap of stand-alone frame of roller mill
WO2011038964A1 (en) * 2009-09-29 2011-04-07 Siemens Aktiengesellschaft Method for the model-based determination of actuator nominal values for the symmetric and asymmetric actuators of the roll stands of a hot wide strip mill
CN103252350A (en) * 2012-02-17 2013-08-21 宝山钢铁股份有限公司 Leveling method for finishing mill after roller changing
CN104070072A (en) * 2013-03-27 2014-10-01 宝山钢铁股份有限公司 Leveling method for zero-adjustment rolling roll gaps of working rolls
CN108284136A (en) * 2018-01-19 2018-07-17 山东钢铁集团日照有限公司 A method of improving finishing mill roll gap stated accuracy
CN109877165A (en) * 2019-04-10 2019-06-14 北京科技大学设计研究院有限公司 A kind of automatic acyclic homologically trioial method containing roll neck compensating for variations after roll change

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