CN111451294B - Method for improving strip shape precision of hot-rolled strip steel - Google Patents
Method for improving strip shape precision of hot-rolled strip steel Download PDFInfo
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
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Abstract
The invention relates to a method for improving the strip shape precision of hot-rolled strip steel, which comprises the following steps: 1) calculating a rigidity correction coefficient K; 2) measuring the input rigidity of the frame when the roll diameter of the finishing mill changes, calculating the rigidity measured value of the frame, and simultaneously judging the rigidity deviation value before and after the roll diameter changes; and measuring the input rigidity of the frame when the size of the base plate under the support roller of the finishing mill changes, calculating the rigidity measured value of the frame, and judging the rigidity deviation value before and after the change of the base plate. The advantages are that: the calculation and judgment of the rigidity adjustment correction coefficient are introduced when the strip steel calculates the roll gap value and the rolling force load distribution, the precision quality of the hot-rolled strip steel is improved, the probability of steel blocking in a finish rolling area and rolling breakage of a finish rolling tail caused by poor strip shape is reduced, the coil shape of a coiling head and the tail is prevented from being influenced, and the quality is improved.
Description
Technical Field
The invention relates to a method for improving the strip shape precision of hot-rolled strip steel.
Background
When hot-rolled strip steel is produced, rolling parameters are reasonably set, the reduction load of a finishing mill (including the rolling force, the reduction amount and the like of each stand) is reasonably distributed, and the reduction of uneven deformation in the rolling process is an important technical measure for controlling the strip steel shape and is a basic measure for ensuring excellent strip shape. Therefore, from the start of roll gap load distribution calculation before strip steel biting to the dynamic adjustment before steel throwing ending, if the accurate calculation of the rolling force is left, the strip steel shape cannot be controlled. During normal production, the FSU is mainly used for setting and controlling the thickness and the temperature of the strip steel at a finish rolling outlet by pressing down each rack of a finish rolling unit and setting the load and the speed according to incoming material conditions, and is also the basis of plate shape control. If the racks are pressed down and the load distribution is not reasonable, even if the load of the rear rack is larger than that of the front rack, the plate shape will be deteriorated. Although it can be compensated by working roll shifting auxiliary roll bending technology UC such as HC + WRB, free rolling technology such as PC + ORG, roll crossing and working roll traversing of PC + WRS combined with process control technology PCS and the like, combining hydraulic roll bending with other plate shape control technologies, the equipment is burdened and even exceeds the capability.
In recent two years, along with the gradual reduction of equipment precision, some production and equipment problems are gradually exposed, and the plate shape quality and the production stability of products are obviously influenced. The main phenomenon is represented by the plate shape defect of the hot continuous rolling steel plate:
1. the wave shape includes single side wave, double side wave, middle wave, composite wave, etc.
2. The head and the tail of the device can not meet the requirement of unevenness.
3. And (6) transverse crease marking.
We found that the mill stiffness dropped differently for each stand through several strip shape test runs. As the most main precision index of the rolling mill, the reduction of the rigidity of the rolling mill directly influences the model calculation of the rolling force and the roll gap, further influences the shape precision of the product, and brings unstable production factors and product quality problems.
The plate shape model is different in rolling force setting size calculated according to factors such as incoming material thickness, steel grade, roller thermal convexity, roller abrasion and actually rolled plate shape feedback. The rigidity in the original model control is treated as fixed number, only the next steel is adjusted by the learning function, and the rigidity is solidified into constant treatment, which obviously cannot meet the production conditions and the current equipment situation of the control strip shape of the existing rolling mill. The change of the rigidity value affects the setting accuracy of the rolling force, and further affects the roll bending force input before the steel is bitten by the frame, so that the shape control is very poor. Particularly, when the rigidity deviation value between adjacent frames is large, the probability of unqualified convexity and wave-shaped performance is greatly increased, the rolling risk is increased, the probability of breaking of the head steel clamp and the tail of the finish rolling in a finish rolling area and a coiling area is increased, meanwhile, the coiling shape is also influenced, external defects such as poor coiling shape, tower shape, overflow edge and the like are easily caused, and in addition, the edge wave shape is not good, the curling edge is easily caused in the coiling guide ruler, and defective products are caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for improving the strip shape precision of hot-rolled strip steel, which measures and checks the rigidity of each frame of a finishing mill periodically, increases a rigidity compensation adjustment coefficient in a mathematical model, makes up the influence on strip shape control calculation caused by inaccurate rolling force calculation due to rigidity fluctuation, and introduces judgment of frame load correction to improve the strip shape quality of the hot-rolled strip steel, reduce the occurrence probability of quality accidents and improve the production efficiency.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for improving the strip shape precision of hot-rolled strip steel comprises the following steps:
1) calculating a stiffness correction factor K
In the formula (1), a is a calculated rigidity value, tonnage/mm;
p is the calculated rolling force value, tonnage, h is the calculated roll gap value, mm; a is1The stiffness value, tonnage/mm, calculated for the next cycle;
p1rolling force value, tonnage, h calculated for the next cycle1Is the roll gap value of the next period, mm; b is the actually measured rigidity value, tonnage/mm;
f is the actually measured rolling force value, tonnage; b1The measured stiffness value of the next period, tonnage/mm,
f1the measured rolling force value in the next period is the tonnage; if K is more than 1, introducing an adjusting value for correction;
2) control method
a) Measuring the input rigidity of the rack when the roll diameter of the finishing mill changes, calculating the measured value of the rigidity of the rack, simultaneously judging the size of the rigidity deviation value before and after the roll diameter changes, correcting the rigidity compensation adjustment coefficient according to a rigidity deviation compensation proportioning formula to perform calculation if the rigidity of the rack is less than 380 tons of force/mm, and directly calculating the rolling force according to the set value if the rigidity of the rack is not less than 380 tons of force/mm;
b) measuring the input rigidity of the rack when the size of a base plate under a supporting roller of a finishing mill changes, calculating the measured value of the rigidity of the rack, simultaneously judging the size of the deviation value of the rigidity of the base plate before and after the change, correcting the rigidity compensation adjustment coefficient according to a rigidity deviation compensation proportioning formula to perform calculation if the rigidity of the rack is less than 420 tons of force/mm, and directly calculating the rolling force according to the set value if the rigidity of the rack is not less than 420 tons of force/mm;
c) and when the rigidity measured values of adjacent racks deviate, the rigidity value benchmark of the previous rack is multiplied by 0.6-0.95 coefficient data, the rigidity value benchmark of the next rack is multiplied by 0.90-1.25 coefficient data, the rigidity deviation value before and after the change of the base plate is judged at the same time, if the rigidity of the rack is less than 400 tons/mm, the rigidity compensation adjustment coefficient is corrected according to a rigidity deviation compensation proportioning formula to perform calculation, and if the rigidity of the rack is not less than 400 tons/mm, the rack directly performs rolling force calculation according to program setting.
Compared with the prior art, the invention has the beneficial effects that:
the method introduces calculation judgment of the rigidity adjustment correction coefficient when the strip steel calculates the roll gap value and the rolling force load distribution, improves the precision quality of the strip shape of the hot-rolled strip steel, reduces the probability of steel blocking in a finish rolling area and rolling breakage of a finish rolling tail part caused by poor strip shape, avoids the influence on the coiling shape of a coiling head and the coiling shape of the tail part, improves the quality, greatly reduces the accident time and improves the production efficiency.
Drawings
FIG. 1 shows the effect of the stiffness coefficient of the mill on the thickness of the strip.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
The method for improving the strip shape precision of the hot-rolled strip steel comprises the following steps:
1. stiffness correction factor K
The rigidity of the rolling mill is gradually reduced along with the aging of equipment, the influence of the rolling force, the rolling reduction and the like of each rack on the uneven deformation in the rolling process is fully considered on the basis of reasonably distributing the rolling load of each rack of the finishing mill group through the FSU of the end station data collector before the rolling of the rolling mill, the disturbance of the edge of the steel plate is reduced, and the uniform rolling deformation is ensured. Respectively adopting a model type, a rolling force and a roll gap set value to set and correct the roll bending force, the rolling force and the roll gap locking value of each frame, calculating the required rolling force and the roll bending force according to the equal-ratio crown of each frame, and finally determining the calculated values of the rolling force and the roll bending force according to the rolling force limit; the detection of the rigidity of the rolling mill mainly compensates the automatic control AGC caused by full hydraulic thickness; the influence of the rolling force fluctuation caused by the throwing on the flatness aims to keep the shape of the full-length strip steel consistent until the strip steel leaves the front frame. Calculating rigidity deviation, and introducing a rigidity correction coefficient K:
in the formula (1), a is a calculated rigidity value, tonnage/mm;
p is the calculated rolling force value, tonnage, h is the calculated roll gap value, mm; a is1For the next cycleStiffness value of (a), tonnage/mm;
p1rolling force value, tonnage, h calculated for the next cycle1Is the roll gap value of the next period, mm; b is the actually measured rigidity value, tonnage/mm;
f is the actually measured rolling force value, tonnage; b1The measured stiffness value of the next period, tonnage/mm,
f1the measured rolling force value in the next period is the tonnage; if K > 1, a control value is introduced&And (6) carrying out correction.
Respectively calculating the rolling force and the thickness of each stand according to the following formulas (2) and (3), introducing a rigidity adjustment correction coefficient according to the rigidity deviation, and compensating the rigidity coefficient of the rolling mill from K1To K2When changed (mill elasticity curve changed from a1 to a2), see fig. 1. The actual rolling thickness is h1Change to h2When the rolling force is changed correspondingly, the steel plate is deformed unevenly, but the proportional coefficient calculated corresponding to the rolling force is not adjusted in a follow-up manner. The rolling force was calculated as follows:
P＝Lcrcal(i)·Fwcal·Kmcal(i)·Ldcal(i)·Qpcal(i) (2)
in formula (2): p is a calculated rolling force value and a tonnage; lcrcal(i) Is the stress rate; fwcalIs the average width of the mill, mm; kmcal(i) Is resistance to deformation, kg/mm2；Ldcal(i) The contact arc length is mm; qpcal(i) Is a function of rolling force.
S＝h-FGEN1(P+FB)/αW·GWID+FGEN2(VFSU)·G/Mcal+GMEFSU+GBIAS (3)
In formula (3): s is a set roll gap value, mm; h is the outlet thickness, mm; p is calculated rolling force and tonnage; FB is roll bending force, tonnage;GWIDis the width compensation gain; alpha is alphaWIs the width correction factor; vFSUIs the velocity value, m/s; mcalIs mill stiffness, tonnage/mm; GMEFSU(bounce thickness) - (second flow thickness); GMEFSUIs the learning value, mm; gBIASCalculating a compensation value; g is a correction value made by the heating furnace.
Rolling mill rigidity Mcal：
Mcal(i)＝P(i-1)-P(i)/Hcal(i-1)-H(i) (4)
In formula (4): mcal(i) Is the rigidity of a certain rolling mill, tonnage/mm; p is calculated rolling force and tonnage; hcal(i) Is a roller seam, mm; h (i) thickness of the frame, mm;
in the rolling process of the strip steel, the strip shape of the strip steel has a plurality of influence factors, such as rolling mill load, roll bending force, PC angle, roll thermal expansion, roll abrasion, initial roll shape of the roll and incoming strip shape, which have important influence on the strip steel shape. Thus, various factors affecting the plate shape are sufficiently considered in performing the plate convexity calculation.
Whether visible wave shapes appear on the rolled strip steel under certain rolling pressure and roll bending force can be judged through a model formula;
1) the calculation formula of the plate convexity is as follows:
equation (5) takes into account crown C due to rolling forcePMm; crown C caused by roll bending forceFMm; original crown C of rollRMm; wear crown CWMm; thermal crown CHMm; mechanical crown C produced by the PC angle of a PC rolling millθ，mm。
In formula (5): cP＝P/KPP is calculated as rolling force, tonnage, KPIs the transverse rigidity coefficient; cF＝EFF, F is roll bending force, tonnage, EFRoll bending force influence coefficient;
is the incoming material convexity, mm; eta is the genetic coefficient of the plate convexity; c0Is the strip steel convexity constant; χ is a coefficient related to the width of the strip; xiθIs the PC angle influence coefficient; xiWIs the WR impact coefficient;
2) mathematical model for influence coefficient of transverse stiffness coefficient of roller
The transverse rigidity coefficient of the roller system to the rolling force is the rolling force required for generating unit deformation difference between the center of the plate and the edge of the plate when the plate width is fixed, the unit of the transverse rigidity coefficient is tonnage/mm, and the transverse rigidity coefficient reflects the WR convexity change condition caused by the deformation of the roller. Influence coefficient K of roll transverse rigiditycThe following formula is used for the calculation of (c):
in the formula (6), the reaction mixture is,
houtis the outlet thickness, mm, DwIs the diameter of the working roll, mm, and W is the width of the strip steel, mm; p is calculated rolling force and tonnage; crown0 is the Crown due to roll deformation and roll flattening caused by the contact pressure between the backup roll and the work roll, the work roll and the rolled material, when only rolling force is applied without bending force.
3) Roll bending force influence coefficient mathematical model
The roll bending force influence coefficient reflects the influence of roll bending force on the strip steel convexity, and the calculation formula is as follows:
in the formula (7), the reaction mixture is,
houtis the outlet thickness, mm, DwWorking roll diameter, mm, WRBMAXFor rolling strip steel to maximum widthMm; crown1 is the Crown mm generated by the deformation of the rollers and the flattening of the rollers under the condition of applying the maximum bending force and rolling force, wherein the deformation of the rollers is generated by the contact pressure between the supporting rollers and the working rollers and between the working rollers and rolled pieces; crown0 is the Crown in mm generated by the deformation of the rolls and the flattening of the rolls generated by the contact pressure between the backup rolls and the work rolls, the work rolls and the rolled pieces under the condition of only rolling force without applying bending force.
4) Working roll convexity influence coefficient mathematical model
The influence coefficient of the convexity of the working roll reflects the influence of the convexity of the working roll on the strip steel shape, and the calculation formula is as follows:
in the formula (8), the reaction mixture is,
houtis the outlet thickness, mm, DwIs the diameter of the working roll, mm, and W is the width of the strip steel, mm; crown1 is the Crown mm generated by the deformation of the rollers and the flattening of the rollers under the condition of applying the maximum bending force and rolling force, wherein the deformation of the rollers is generated by the contact pressure between the supporting rollers and the working rollers and between the working rollers and rolled pieces; crown0 is the convexity, mm, generated by the deformation and flattening of the rollers due to the contact pressure between the supporting rollers and the working rollers and between the working rollers and the rolled pieces under the condition that the bending roller force is not applied and only the rolling force is applied;
introducing regulating values&Then K isp＝Kc*& (9)
In the formula (9), KPIs the transverse rigidity coefficient; kcCalculating a roll transverse stiffness influence coefficient;&is a compensation coefficient; if it is&>1, generating middle waves; if it is&<1, generating edge waves. Stiffness (reference value 380 ton force-mm), Kp ═ Kc.
2. The method comprises the following steps of periodically measuring deviation states of pad plate sizes and rigidity values according to the diameter of a roller, switching the tail part of the steel strip to a balance state by a bending roller according to a tail part switching time sequence after the steel strip is thrown, mainly ensuring the flatness of the head part/the tail part of the steel strip, enabling the head part and the tail part of the steel strip to be straight or slightly wavy, enabling the strip steel convexity to be close to a target value as much as possible on the basis, calculating switching bending roller forces of other racks according to an equal ratio convexity principle, and judging the bending roller force set for the head part/tail part plate shapes during switching, wherein the operation steps are as:
a) measuring the input rigidity of the rack when the roll diameter of the finishing mill changes, calculating the rigidity measurement value of the rack, and simultaneously judging the rigidity deviation value before and after the roll diameter changes, if the rigidity is less than 380 ton force/mm, correcting the rigidity compensation adjustment coefficient according to a rigidity deviation compensation proportioning formula to perform calculation, and if the rigidity is more than or equal to 380 ton force/mm, directly performing rolling force calculation according to program setting by the rack;
b) measuring the input rigidity of the rack when the size of the base plate of the finishing mill changes, calculating the rigidity measurement value of the rack, and simultaneously judging the rigidity deviation value before and after the change of the base plate, if the rigidity is less than 420 tons/mm, correcting the rigidity compensation adjustment coefficient according to a rigidity deviation compensation proportioning formula to perform calculation, and if the rigidity is greater than or equal to 420 tons/mm, directly performing rolling force calculation according to program setting by the rack;
c) when the rigidity measured values of adjacent racks deviate, the rigidity value benchmark of the previous rack is multiplied by 0.6-0.95 coefficient data, the rigidity value benchmark of the next rack is multiplied by 0.90-1.25 coefficient data, and meanwhile, the rigidity deviation value before and after the change of the base plate is judged, if the rigidity is less than 400 tons of force/mm, the rigidity compensation adjustment coefficient is corrected according to a rigidity deviation compensation proportioning formula to perform calculation, and when the rigidity is not less than 400 tons of force/mm, the racks directly perform rolling force calculation according to program setting;
the method introduces calculation and judgment of the rigidity adjustment correction coefficient when the strip steel calculates the roll gap value and the rolling force load distribution, improves the precision quality of the strip shape of the hot-rolled strip steel, reduces the probability of steel blocking in a finish rolling area and rolling breakage of a finish rolling tail part caused by poor strip shape, avoids the influence on the coiling shape of a coiling head and the coiling shape of the tail part, improves the quality, greatly reduces the accident time and improves the production efficiency.
Claims (1)
1. A method for improving the strip shape precision of hot-rolled strip steel is characterized by comprising the following steps:
1) calculating a stiffness correction factor K
In the formula (1), a is a calculated rigidity value, tonnage/mm;
p is the calculated rolling force value, tonnage, h is the calculated roll gap value, mm; a is1The stiffness value, tonnage/mm, calculated for the next cycle;
p1rolling force value, tonnage, h calculated for the next cycle1Is the roll gap value of the next period, mm; b is the actually measured rigidity value, tonnage/mm;
f is the actually measured rolling force value, tonnage; b1The measured stiffness value of the next period, tonnage/mm,
f1the measured rolling force value in the next period is the tonnage; if K is more than 1, introducing an adjusting value to carry out rigidity correction on the rack;
2) control method
a) Measuring the input rigidity of the rack when the roll diameter of the finishing mill changes, calculating the measured value of the rigidity of the rack, simultaneously judging the size of the rigidity deviation value before and after the roll diameter changes, correcting the rigidity compensation adjustment coefficient according to a rigidity deviation compensation proportioning formula to perform calculation if the rigidity of the rack is less than 380 tons of force/mm, and directly calculating the rolling force according to the set value if the rigidity of the rack is not less than 380 tons of force/mm;
b) measuring the input rigidity of the rack when the size of a base plate under a supporting roller of a finishing mill changes, calculating the measured value of the rigidity of the rack, simultaneously judging the size of the deviation value of the rigidity of the base plate before and after the change, correcting the rigidity compensation adjustment coefficient according to a rigidity deviation compensation proportioning formula to perform calculation if the rigidity of the rack is less than 420 tons of force/mm, and directly calculating the rolling force according to the set value if the rigidity of the rack is not less than 420 tons of force/mm;
c) and when the rigidity measured values of adjacent racks deviate, the rigidity value benchmark of the previous rack is multiplied by 0.6-0.95 coefficient data, the rigidity value benchmark of the next rack is multiplied by 0.90-1.25 coefficient data, the rigidity deviation value before and after the change of the base plate is judged at the same time, if the rigidity of the rack is less than 400 tons/mm, the rigidity compensation adjustment coefficient is corrected according to a rigidity deviation compensation proportioning formula to perform calculation, and if the rigidity of the rack is not less than 400 tons/mm, the rack directly performs rolling force calculation according to program setting.
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