80results about "Rare end control device" patented technology

The application provides a method for improving the execution precision of a reversible rough rolling mill tail short stroke, and relates to the technical field of industrial automation. The method sets three heat detectors at the entrance of the vertical roll mill, sets the short stroke parameters of the vertical roll mill at each pass tail when the slab is discharged, when the odd pass is detected, the first heat detector detects the loss, and the tail position is tracked according to the set vertical roll mill current pass back slip and actual speed; when the second heat detector detects the loss, the actual back slip value of the vertical roll is calculated according to the distance between the first two heat detectors and the tracking length, and the tracking length is corrected, and the tail is continuously tracked; when the third heat detector detects the loss, the back slip value and the tail tracking position are continuously corrected; when the distance between the tail and the vertical roll mill reaches the start distance of the short stroke, the vertical roll gap is adjusted according to the set value; when the tail leaves the vertical roll, the vertical roll mill keeps the current position until the tail of the steel plate leaves the flat roll mill. The method realizes the real back slip of the vertical roll mill through multiple heat detectors, and improves the tail tracking precision and the width control precision.

The invention discloses a 2.0 mm thin material production efficiency improving method which is applied to a hot continuous rolling production line, and the hot continuous rolling production line comprises a rough rolling area and a finish rolling area. In the advancing direction of the thin material, rough rolling mills R1 and R2 are arranged in the rough rolling area, and finish rolling mills F1-Fn are arranged in the finish rolling area; a roller way area E3 is arranged in the rough rolling area and the finish rolling area, and a roller way G and a coiling and feeding roller are arranged behind the finish rolling machine Fn; the method comprises the steps that the variety and the specification size of a thin material entering a hot continuous rolling production line are limited; according to the variety and width specification of the thin material entering the rough rolling area, the speed of the last pass of R1 and R2 is set; the set steel biting speed of the coil steel on the finishing mill Fk before the first time and the set steel biting speed of the coil steel on the finishing mill Fk after the first time are obtained; based on the sum, obtaining an alarm time interval; and setting an alarm threshold value t, and triggering an alarm at t. The production efficiency and the product quality of the 2.0 mm thin material are obviously improved through the optimal design of the intermediate billet in the rough rolling area and the intelligent control of the rough rolling area and the finish rolling area.

The invention provides a method for improving IF steel ferrite rolling end quality and prepared IF steel, and relates to the technical field of IF steel preparation. The method comprises the steps that a to-be-rolled plate blank is obtained; rough rolling is conducted on the to-be-rolled plate blank, and an intermediate blank is obtained; the width of the intermediate billet is reduced through an E2 vertical roller, and the intermediate billet with the width reduced is obtained; the width-reduced intermediate billet is subjected to finish rolling and high-temperature coiling, and an IF steel hot-rolled strip coil is obtained; wherein the rolling tonnage of the E2 vertical roll is smaller than 300,000 tons, the hardness on-machine standard of the E2 vertical roll is larger than or equal to 50 HSD, and the finish rolling process and the high-temperature coiling process are both in an air cooling state. The quality of the ferrite rolling end face can be improved by controlling the quality and hardness of the vertical roll surface; and by controlling the cooling mode, static recrystallization of ferrite at the edge can be promoted, and the quality of the end of the strip steel is further improved. According to the method, by optimizing the hot rolling process, the microstructure of the edge of the strip steel can be obviously improved, and therefore the quality of the IF steel ferrite rolling end is improved.

This control device for a rolling device is to be used for controlling a rolling device including a pair of rolling rolls provided so as to sandwich a metal plate, and a winding machine for winding the metal plate rolled by the pair of rolling rolls, the control device being configured such that after the distal end part of the metal plate is passed between the pair of rolling rolls in a state in which a gap between the pair of rolling rolls is greater than the plate thickness of the metal plate, the pair of rolling rolls are rotated so that the distal end part of the metal plate reciprocates between the pair of rolling rolls and the winding machine before the distal end part of the metal plate reaches the winding machine, in a state in which a distal-end-part tension applied to the distal end part of the metal plate is zero and in which the metal plate is pressed down by the pair of rolling rolls.

The application provides a preparation method of a hot-rolled strip steel of Cr-Mo steel material, the Cr-Mo steel material contains Cr: 0.80-1.10wt%, Mo: 0.15-0.25wt%, the laminar cooling process adopts U-shaped cooling, after the strip steel head passes through the last rack in the multi-rack finishing rolling process, the pinch roll cooling water, the coiling roll cooling water and the mandrel cooling water are closed, after the coiling mandrel is built for a period of time, the pinch roll cooling water and the coiling roll cooling water are opened, the multi-rack finishing rolling process is ended, after the strip steel is tail thrown from the last rack for a period of time, the pinch roll cooling water and the coiling roll cooling water are closed, the mandrel cooling water is opened after the strip steel is discharged from the coiling machine, vertical transportation is adopted after the coiling is unloaded, the steel coil after rolling is placed for slow cooling in the warehouse area, so that the mechanical property uniformity of the steel coil can be obviously improved, the performance stability is improved, the thickness fluctuation of the cold rolling process is reduced, and the flatness quality of the product is improved.

The application relates to a rolling piece head tracking method for a hot rolling and coiling production line, the hot rolling and coiling production line comprising a rolling channel for conveying a rolling piece, pinch rolls matched with the rolling channel, and detection elements arranged directly above the rolling channel, and the method comprises the following steps: acquiring a head signal of the rolling piece, starting tracking and recording first tracking data S1; acquiring a signal that the rolling piece reaches the pinch rolls, stopping tracking; acquiring a horizontal installation interval L between the detection elements and the pinch rolls, and correcting the first tracking data S1 to S1=L; the method does not need to additionally increase the detection elements, reduces the cost of rolling piece head tracking, can reduce error correction caused by error signals of the increased detection elements, and guarantees the accuracy and reliability of rolling piece head position tracking; the correction means is not referenced by light signals, and can effectively avoid the influence of interference sources such as water vapor, fog, light pollution and the like in the field environment.

The invention relates to a control method for preventing rough rolling upwarp during low-temperature production of non-oriented silicon steel, which comprises the following steps: adopting a hot charging and hot delivery process for a non-oriented silicon steel slab, and controlling the temperature difference between the upper surface and the lower surface of the slab within 10 DEG C after the slab enters a second heating section; the total heating time of the second heating section and the soaking section is not less than 70 minutes, and the total time of the second heating section and the soaking section in the furnace is 170-230 minutes; the tapping temperature of the plate blank is 1100-1120 DEG C; the R2 rolling mill working roll is pressed downwards, and the roll diameter difference is 1-2 mm; and the rolling reduction rate of the fourth pass of rough rolling is controlled to be 20%-25%. By controlling the charging temperature of the plate blank, the temperature difference between the upper surface and the lower surface of the plate blank when the plate blank enters the furnace, the heating temperature and time of each section and controlling the reduction rate of the fourth pass of rough rolling and the R2 working roller, the head warping phenomenon after low-temperature heating during rough rolling is effectively controlled, energy is saved, accidents caused by head warping of the plate blank are prevented, and the production efficiency is improved. And the excellent magnetic performance of the low-temperature non-oriented silicon steel product is ensured.

The application relates to the technical field of steel rolling, and discloses a hot continuous rolling strip head thickness deviation control method and device and electronic equipment. The method comprises the following steps: acquiring an actual head thickness value of a current strip in a hot continuous rolling mill rolling process and a target head thickness value of the current strip; determining a head thickness deviation value of the current strip according to the actual head thickness value and the target head thickness value; acquiring an actual rolling force of the current strip and a calculated rolling force of the current strip; determining a rolling force deviation value of the current strip according to the actual rolling force and the calculated rolling force; and determining a target set rolling force of a next coil of the current strip according to the head thickness deviation value and the rolling force deviation value. The technical scheme disclosed by the application can effectively improve the strip head thickness deviation problem caused by the rolling force setting calculation deviation, reduce the thickness out-of-tolerance occurrence rate, improve the product thickness control precision and the yield rate.

The invention belongs to the technical field of bar rolling, and discloses a control method for eliminating a deformed steel bar shearing end face elbow, which comprises the following steps: S1, arranging a compression roller at an inlet of a cooling bed; s2, positions of movable teeth and static teeth of the cooling bed are calibrated; S3, the mounting height of the arrangement chain is adjusted to eliminate the height difference between the arrangement chain and the movable teeth of the cooling bed; s4, a dense arrangement roller and a tail sweeping device are arranged; a head water cooling device is mounted at the end of the cooling bed; s6, optimizing the replacement mode of the cold shear blade and the mounting structure of the front cover plate of the shear blade; through multi-link targeted control, key inducements causing the deformed steel bar shearing end face elbow are eliminated from the source, the problem of shearing end face elbow puzzling small-specification deformed steel bar production for a long time is effectively solved, the shape of the end of a finished product is regular, the packaging quality of the small-specification finished product is greatly improved, and the production cost is reduced. And the problems of disordered packaging arrangement, difficult packaging and the like caused by bends are avoided.

The invention discloses a pipeline steel finishing mill group, a control method and device thereof and a medium. The finishing mill group comprises a plurality of finishing mill racks, each finishing mill rack comprises a working roller group arranged at an inlet of the rack, each working roller group comprises an upper working roller and a lower working roller which are arranged on the two opposite sides of the slab conveying belt, and the upper working roller is provided with a first roller gap cooling water collecting pipe and a first roller cooling water collecting pipe. The lower working roll is provided with a second roll gap cooling water collecting pipe and a second roll cooling water collecting pipe, and the method comprises the following steps: after a first duration from the starting moment when a plate blank of the pipeline steel enters the working roll group, controlling the second roll cooling water collecting pipe to be opened; and / or the second roll gap cooling water collecting pipe is controlled to be opened before the plate blank of the pipeline steel enters the working roll set, and the first roll gap cooling water collecting pipe is controlled to be opened after a second duration from the starting moment when the plate blank of the pipeline steel enters the working roll set. Therefore, the problem that the head of the plate blank of the pipeline steel tilts can be solved.

The invention relates to an automatic centering control method for a hydraulic cylinder, which adopts a control system consisting of a displacement sensor, a proportional valve and a programmable controller, the displacement sensor detects the displacement value of a piston rod of the hydraulic cylinder in real time, and the proportional valve receives control information sent by the programmable controller and controls the piston rod of the hydraulic cylinder to move. The method is novel and practical, the centering motion synchronism of the hydraulic cylinder is high through closed-loop control, the displacement is accurate, steel plates with different widths can be centered intelligently and automatically, the centering precision is high, and the centering precision is high. And the phenomena of hydraulic cylinder damage and clamping steel plate deformation and scrapping are avoided, the centering work efficiency is high, and the service life is long.

The present application relates to the technical field of intelligent steel production application, especially to a strip tail section control method and device based on rolling force difference data.A strip tail section control method based on rolling force difference data includes: collecting field operation side data and transmission side data for division to obtain reference section data, full output section data and one-way output section data; calculating according to the reference section data to obtain a rolling force difference reference value; determining the roll gap leveling value direction according to the full output section data, and determining whether the roll gap leveling operation is issued according to the one-way output section data.The strip tail section is controlled.The present application is a high-efficiency and stable finishing strip tail section control method based on rolling force difference data.

The application discloses a control method for improving tail quality of thin-gauge high-strength steel, and the method comprises the following steps: calibrating parameters of a rough rolling mill and a finishing mill; adjusting the distance between the head tail of the intermediate billet in the rough rolling mill and the rolling center line, and setting the tail short stroke value of the entry side guide plate of the finishing mill; based on the calibrated rolling mill parameters, when the tail of the thin-gauge high-strength steel is rolled, the short stroke value is increased based on the set tail short stroke value of the entry side guide plate of the finishing mill, the parameters of the automatic opening of the entry side guide plate of the finishing mill are set, and the parameters of the roll gap of the finishing mill are set. The application can solve the local folding, one-side tail flinging and rolling failure caused by the inconsistent extension of the two sides of the strip steel due to the temperature, rolling pressure, abnormal plate shape adjustment and the like in the actual production process, and the production efficiency is improved.

The application provides a method for improving quality and efficiency and controlling tailing deviation of a rolling mill by using a flattening roller at the entrance of the rolling mill, wherein the flattening roller group at the entrance of the rolling mill comprises a fixed roller and one movable upper roller; the upper roller is a flattening roller for pressing the strip, and the pressing position of the upper roller depends on the position of a depth adjusting device platform; the position of the depth adjusting device platform is vertically adjusted by a motor and a transmission device connected to the motor; in the method, an encoder is installed at the motor, and a depth adjusting target value is automatically generated according to the thickness of the strip at the entrance to control the pressing position of the upper roller; and the application can optimize the rolling mill process.

This invention relates to a control method for simultaneous online coiling of two steel sections in hot continuous rolling, comprising the following steps: S1, constructing a head-tail tracking module and a simultaneous online buffer for the two steel sections; S2, the head-tail tracking module tracks the head-tail position data of each of the two rolled sections when they are simultaneously online, and sends the head-tail position data to the coiling computer; S3, the process machine receives the coiling machine function selection, and sends the actual control parameters to the simultaneous online buffer for the two steel sections according to the coiling machine function selection; the coiling computer sends the actual control parameters to the coiling machine according to the on-site strip logic. This solution solves the problem of flashing malfunction in hot strip inspection, enhances the stability of the system, thereby meeting the control requirements for online coiling of two steel sections, improving the coiling rhythm of the coiling machine, and thus improving the overall rolling rhythm of hot continuous rolling.

The invention discloses a control method for solving the problem of soft strip steel head coil loosening, and relates to the technical field of metallurgical steel rolling. According to the control method for solving the problem of head loosening of the soft strip steel, the coiling temperature gradient, the laminar cooling gradient and the coiling tension gradient are cooperatively controlled and optimized, and the problem of head loosening generally occurring after the soft strip steel is cooled is solved from the process technology level. A low-temperature coiling method is adopted in the head area, high-strength cooling operation is implemented in cooperation with a laminar cooling system, and the hardness of the head of the strip steel is greatly improved through the synergistic effect of the two. And meanwhile, a large-tension coiling control strategy is applied, so that the coiling compactness of the steel coil is practically ensured. The three gradient control means are matched with one another to form closed-loop regulation and control, so that the strip steel can still keep a good coiled state even after being cooled, and the overall quality of a steel coil is remarkably improved.

The application belongs to the technical field of hot continuous rolling finishing rolling, and particularly relates to a control method for improving tailing in hot continuous rolling finishing rolling, which comprises the following steps: after gradient heating treatment of a slab, rough rolling and finishing rolling are performed; in the gradient heating treatment, the head heating temperature of the slab is 1180 DEG C to 1200 DEG C, the intermediate part heating temperature is 10 DEG C to 15 DEG C higher than the head heating temperature, and the tail heating temperature is 10 DEG C to 15 DEG C higher than the intermediate part heating temperature. The control method for improving tailing in hot continuous rolling finishing rolling provided by the application adopts a gradient heating mode, so that when the slab enters the finishing rolling, the temperature difference between the head and the tail of the slab is small, the tail is easy to deform, and thus the tailing risk is reduced.

The present disclosure relates to a tail-end extrusion suppression device for a tandem rolling mill that rolls a rolled material by a series of N (N≥2) rolling stands. The i-th rolling stand (1≤i≤N) of the tandem rolling mill has an i-th roll bending device that presses the rolled material with a predetermined roll bending pressure. The tail-end extrusion suppression device continuously reduces the roll bending pressure of the (j+1)-th to N-th roll bending devices that are downstream of the j-th rolling stand from when the j-th rolling stand (1≤j≤N−1) is separated from the tail end of the rolled material until the N-th rolling stand is separated.

This invention relates to a method for reducing head warping in cold-rolled duplex steel, belonging to the field of hot-rolled strip steel production technology in the metallurgical industry. The technical solution is as follows: When rolling cold-rolled duplex steel, a cooling water delay program is initiated before the pinch rolls bite the steel; after the pinch rolls bite the steel, the cumulative contact length Lacc between the strip and the pinch rolls is obtained; simultaneously, the cumulative contact time Tacc between the strip and the pinch rolls is calculated, and the upper limit time Th of the pinch roll cooling water delay is calculated based on the coiling temperature setting. When either Lacc ≥ Lh or Tacc ≥ Th is satisfied, the pinch roll cooling water is turned on. The beneficial effects of this invention are: by dynamically controlling the opening and closing sequence of the coiler pinch roll cooling water, the strip head is placed in a relatively stable cooling environment, reducing interference from the cooling water, ensuring uniform temperature drop and phase transformation in the width direction of the strip head, reducing residual stress in the strip, maintaining a good strip shape at the strip head, and reducing the occurrence of head warping.

The utility model relates to the field of aluminum cold rolling mills, in particular to an automatic drifting device for an aluminum cold rolling mill and a control system.The automatic drifting device comprises a cold rolling assembly, folding and unfolding assemblies are arranged at the two ends of the cold rolling assembly, the cold rolling assembly comprises a machine frame, drifting assemblies are fixedly installed on the two sides of the machine frame, and each drifting assembly comprises an installation frame; three guide rollers are rotationally connected to the end, close to the machine frame, of the top of the mounting frame, deviation rectifying rings are fixedly mounted on the outer sides of the two ends of each guide roller, the diameter of the guide roller arranged in the middle is smaller than that of the other two guide rollers, and a damper is arranged between the guide roller in the middle and the mounting frame. Second telescopic rods are fixedly installed at the two ends of the guide roller in the middle, a lifting seat is fixedly installed at the output ends of the second telescopic rods, shaft seats are fixedly installed at the two ends of the bottom of the lifting seat, two clamping rollers are rotationally connected between the shaft seats, and the two clamping rollers are arranged at the tops of the three guide rollers. And waste materials are reduced.

This invention discloses a hot rolling method for aluminum alloy composite materials and the aluminum alloy composite material itself. The method includes the following steps: Step S1, applying an upper skin material and a lower skin material to the upper and lower surfaces of a core material respectively and binding them together with steel strips to obtain a composite ingot; Step S2, conveying the composite ingot to the roll gap formed by the upper and lower work rolls; Step S3, first controlling the lower work roll to retract, then controlling the upper work roll to press down; Step S4, controlling the lower work roll to press up, and then performing a first rolling pass on the composite ingot; Step S5, controlling the lower work roll to press up, and then performing a second rolling pass on the composite ingot; Step S6, controlling the lower work roll to press up, and then performing a third rolling pass on the composite ingot; S7, performing a second rolling pass on the aluminum alloy composite material. This method avoids the situation where the upper and lower skin materials deviate during the rolling process, preventing further rolling, thus improving production efficiency and yield.

The present application relates to a kind of different steel grade hot rolling coiling steel strip tail roll shape control method, belong to the control method technical field specially applicable to metal rolling mill.This method first according to historical data statistics the reference table of different steel grade hot rolling strip steel parameter, offset and adjustment quantity, then in actual production, according to the measured real-time rolling center line offset, in reference table, find the historical adjustment quantity of pinch roll two side pressure difference under the same parameter close to real-time rolling center line offset as the real-time adjustment quantity of pinch roll two side pressure difference, calculate the pinch roll two side pressure difference value formed by the real-time adjustment quantity of control pinch roll from the time t when the strip steel reaches pinch roll;Further, according to whether the pressure of the front side guide plate of pinch roll exceeds the preset pressure value and whether the opening amount change of the front side guide plate of pinch roll reaches the set value, the pressure difference value of the two sides of pinch roll is kept or adjusted.The method can avoid the tail layer and overflow edge of strip steel.

The invention provides a control method and system for CT stability of a strip steel head end, relates to the field of strip steel temperature control, and solves the technical problems of temperature control deviation and low strip steel yield caused by the fact that the temperature between a temperature sampling point and the strip steel head end is not considered in the prior art. The method comprises the following steps: acquiring process parameters of to-be-processed strip steel; wherein the process parameters comprise physical parameters and geometric parameters of the strip steel to be machined; obtaining a basic CT of the to-be-processed strip steel based on the process parameters, and obtaining a compensation CT of the head end of the to-be-processed strip steel; wherein the basic CT represents the CT which the to-be-processed strip steel needs to reach; the compensation CT represents temperature compensation required by the head end of the to-be-machined strip steel; based on the basic CT and the compensation CT, a target CT of the head end of the to-be-machined strip steel is obtained; and analyzing the cooling water flow required by the head end based on the target CT. The method is used in the strip steel head end temperature compensation process.

This invention discloses a method for controlling edge stiffening defects in wide, thin stainless steel plates, comprising: a coil offset of 0–10 mm during mill alignment; a total deformation rate of 75–85%; 8–11 rolling passes with standardized deformation rates and tensions for each pass; using a W-shaped plate shape target curve for passes 1–3 and controlling the actual stress deviation values ​​of the edge and center plate shape for each pass; using a concave plate shape target curve on both sides for passes 4 to the finished product pass and controlling the actual stress deviation values ​​of the edge and center plate shape for each pass; when the operating side thickness is greater than the transmission side thickness and the wedge ratio is ≥1%, a plate shape tilt compensation of 7–15 N / mm is added for passes 1–3. 2 When the thickness of the transmission side is greater than that of the operating side and the wedge ratio is ≥1%, plate tilt compensation of -7 to -15 N / mm is added for the first to third passes. 2 When the steel coil deviates from the drive side or operating side, the amount of movement of the plate shape curve is controlled. This invention solves the problem of edge rib defects in wide, thin stainless steel plates, effectively improving the rolling stability and yield of wide, thin stainless steel plates.

The application provides an analysis method and device for tail thickness jump of hot continuous rolling strip steel, and relates to the technical field of hot continuous rolling. The method comprises the following steps: collecting the tail thickness jump process data of each rack of the hot continuous rolling finishing mill; regarding the 1s before the upstream rack is thrown as the tail thickness jump stage of the downstream rack, the data sampling period is 10ms, and the same product specification data of the strip steel is classified; determining the DS side roll gap thickness jump amount, the OS side roll gap thickness jump amount, the thickness jump amount deviation of the two sides roll gap, the rolling force deviation and the strip steel temperature attenuation value; analyzing the tail thickness jump amount of the strip steel, and putting forward suggestions for the impact of the next strip steel tail thickness jump on the equipment and the yield improvement. The application is based on the continuous judgment of the calculated values of the roll gap and rolling force of each rack of the hot continuous rolling, analyzes the control adjustment strategy of the tail thickness jump amount of the strip steel, and the actual application results show that the analysis method can effectively improve the yield of the strip steel and reduce the impact on the equipment.

This invention discloses a method for controlling the roll gap position of the strip threading head in a hot strip mill, comprising the following steps: S1, determining whether there is a steel biting signal on the stand; if so, proceeding to step S2; S2, starting stand deviation calculation; S3, selecting the subsequent stand roll gap control mode based on the calculation result of step S2. This invention improves roll gap fluctuations caused by abnormal sensor position detection after strip threading by combining strip head tracking with the current roll gap position of the target stand and employing locked position control.

The application discloses a kind of methods for solving entry section threading abnormality using AI technology, comprising the following steps: installing camera step: multiple cameras are arranged at the entry section of the color coater unit, and the angle of the camera is adjusted, so that the entry of the color coater unit is located in the video area of multiple cameras;Networking step: multiple cameras are networked, then multiple cameras are time adjusted, so that the time of multiple cameras is synchronized, and a shared space and a world coordinate are constructed according to the viewing angle of multiple cameras;Calibration step: multiple cameras are sequentially coded, and each camera is initialized, then the camera that has completed initialization is calibrated with the world coordinate.The application identifies and analyzes abnormal state through algorithm, and can automatically analyze and judge the probability of threading abnormality such as steel jam according to incoming material, give judgment and assist decision suggestion, finally realize reducing the probability of threading abnormality at the entry section, improve production efficiency and save maintenance cost.

The invention belongs to the technical field of strip steel rolling and coiling, and provides a strip steel tail speed reduction temperature control method which comprises the following steps: determining a coiling machine tail fixing target speed and a speed reduction acceleration constraint; the speed reduction starting position of the tail of the strip steel on the layer cooling roller way is determined, and the speed of the tail of the strip steel starts to be reduced from the speed reduction starting position; configuring the obtained parameters to a layer cooling model, and performing cooperative control through a process control system and a basic control system; when the speed of the winding drum is reduced to the target tail positioning speed, tail positioning and winding are completed, and it is synchronously determined that the tail winding temperature of the strip steel is stabilized within the target range; according to the method, the speed reduction starting position is optimized, and the speed curve pre-calculation model and cooperative control of the process control system and the basic control system are introduced, so that the contradiction between tail fixing precision and temperature control in the strip steel tail speed reduction process in the prior art is solved; the purposes of ensuring accurate tail fixing of the coiling machine and ensuring that the coiling temperature of the tail part of the strip steel is stabilized in a target range are achieved.

The invention discloses a finish rolling upstream rack leveling control method and system.The method comprises the steps that a center line deviation curve of an intermediate billet at an outlet of the last roughing mill rack is read, and the tail areas of the intermediate billets are sequentially traversed in the rolling direction; and the position where the deviation amount of the center line in the tail area exceeds the allowable deviation range delta of the deviation amount in the steady-state stage and the length Ltail from the position to the head are determined, and when the length of the portion, entering a finishing mill, of the intermediate billet reaches the length Ltail, roll gap leveling control over a finish rolling upstream rack roll is triggered. The method comprises the following steps: segmenting a curve according to a rough rolling incoming plate blank center line offset curve, determining a center line offset reference value, controlling a tail control trigger time point of an upstream rack according to the offset of the tail center line of the plate blank and the reference value, and carrying out roll gap leveling control on a finish rolling upstream rack, the influence of the shape of the tail of the rough rolling incoming material on the deviation of the tail of the finish rolling strip steel is eliminated as much as possible, and the asymmetric strip shape quality of the finish rolling strip steel is improved.

The application relates to a control method of a hot rolling coiler, in particular to a control method of leveling a coiling pinch roll according to a center line deviation of a finishing mill tail part. The center line deviation of the finishing mill tail part is judged, the pinch roll pressure or roll gap leveling amount is calculated according to the judgment result of the center line deviation of the finishing mill tail part, the strip steel thickness, width and hardness group are combined, the working side pinch roll pressure or roll gap is automatically compensated on the basis of the original control through a program to calculate the leveling pressure or roll gap, the pressure or roll gap of the working side pinch roll is increased or decreased, the automatic leveling function of the pinch roll tail part is realized, and the control method of leveling the coiling pinch roll according to the center line deviation of the finishing mill tail part adjusts the pinch roll pressure or roll gap in real time through the center line deviation of the finishing mill tail part, the strip steel tail part deviation is corrected, so that the purpose of controlling the coiling quality is achieved.