551results about "Tension/compression control device" patented technology

The invention relates to the technical field of metal rolling automation, and discloses a computer intelligent control system of a rolling mill, which comprises a rolling mill production line, and the rolling mill production line further comprises a tensiometer, a pressure sensor and a displacement sensor; and the computer intelligent control system is electrically connected with an executing mechanism and a sensor of the rolling mill production line and comprises a tension control module, an automatic thickness control module and an online model self-adaptive module. The method comprises the following steps: controlling strip steel tension through a tension control module; the strip steel outlet thickness is adjusted through the thickness automatic control module; and model parameters such as rolling mill rigidity and friction compensation are identified in real time in the rolling process through an online model self-adaption module, and continuous optimization of the control model is achieved. By introducing the online model adaptive module, real-time online correction of the core physical model of the control system is realized, and the problem of model mismatch caused by equipment wear and working condition change is solved.

The invention discloses a hot continuous rolling unit thickness detection and optimization method based on double closed-loop feedback control. In order to improve the problems of thickness control precision, response speed, a multi-rolling-mill cooperative operation mechanism and the like of an existing hot continuous rolling process, the comprehensive regulation and control method combining driving motor double-closed-loop speed regulation control, hydraulic cylinder pressing closed-loop control and thickness delay correction is provided. A multi-rolling-mill interconnection control system is constructed by coupling the rolling mills, the loops, the driving motors and the hydraulic cylinders, and high-precision dynamic adjustment of the tapping thickness is achieved. A double-closed-loop feedback control method is adopted, the rotating speed of a driving motor is adjusted by combining a rotating speed loop and a current loop, rolling force is dynamically adjusted through a hydraulic cylinder, and a thickness delay correction system is introduced to compensate thickness transmission errors between racks. According to the method, the thickness response time and overshoot of the hot rolling mill can be reduced, the thickness control precision and the system stability are improved, and the method has important guiding significance and engineering application value for high-precision hot continuous rolling production.

The invention relates to the technical field of alloy processing, in particular to a long-service-life elastic titanium-copper alloy for a VCM elastic piece and a preparation method thereof.The preparation method comprises the following steps that firstly, raw materials including 55%-65% of titanium, 30%-25% of copper, 10%-8% of aluminum, 3%-1% of zinc and 2%-1% of magnesium are weighed according to the mass percent; 2, the raw materials are put into a vacuum furnace to be melted, and a liquid melt is obtained; thirdly, the melt is poured into a casting mold for casting, and a blank is obtained; according to the method, the change of the state of the blank can be responded in real time by calculating the influence of the rolling times and the thickness change of the blank on the rolling control parameters, so that the rolling process can be flexibly adjusted according to the actual situation, the adaptability during machining is improved, and the rolling speed is improved when the rolling times are gradually reduced along with the reduction of the rolling times of the blank. The rolling temperature, ratio, speed and pressure are reduced, excessive deformation and damage of blanks can be effectively prevented, and the quality of final products, namely the elastic life of the alloy, is improved.

The invention discloses a serial cold rolling system thickness and tension control method based on data driving, and relates to the technical field of intelligent predictive control. According to the method, the neural network model is driven by non-autonomous data for prediction, dynamic mapping of tension and thickness parameters is realized through a self-learning mechanism, and high-precision prediction can be completed without depending on real-time measurement data. According to the method, the problems of hysteresis and error accumulation of a traditional measurement link are effectively solved, and deviation transfer in multi-rack cooperative control is effectively inhibited while the prediction efficiency is remarkably improved. A Laguerre function is integrated, parameter dimensionality reduction of a network weight space is achieved through orthogonal projection, the calculation amount is reduced, and the time for reaching a target value is shortened. A multivariable coupling mathematical model of the tension and the thickness of the cold-rolled strip steel is constructed, a Nash equilibrium game optimization strategy is introduced based on a distributed optimal control theory framework, and multi-target collaborative optimization control of the tension-thickness is realized.

The invention discloses a manufacturing method for improving the cold-rolled edge crack defect of high-silicon phase-change-free electrical steel, which comprises the following steps: converting molten iron by a converter, transferring to an RH (Ruhrstahl Heraeus) furnace, carrying out vacuum smelting, carrying out alloying treatment, and continuously casting the molten steel with chemical components meeting requirements into a plate blank; the plate blank is hot-rolled into a hot-rolled plate after being heated and subjected to heat preservation; and the hot-rolled plate is subjected to normalizing, acid pickling, cold rolling, continuous annealing and insulating coating coating to prepare a high-silicon phase-change-free electrical steel finished product. In the hot rolling process, the steel plate is transversely rolled through a vertical roller, the vertical roller reduction rate delta B of the vertical roller pass meets the condition that delta B is larger than or equal to 10 * delta h / H inlet and smaller than or equal to 18 * delta h / H inlet, delta h is the thickness difference of the plate blank before and after the pass, and H inlet is the thickness of the plate blank at the pass inlet. Through the process design of the procedures of continuous casting, heating, hot rolling, normalizing, cold rolling and the like, the structure uniformity of the material is improved, especially the structure uniformity in the thickness direction, and the one-time passing rate of cold rolling is 95% or above.

The invention belongs to the technical field of cobalt-based alloy machining, and particularly relates to high-strength cobalt-based alloy rolling machining equipment which comprises a rack and a cooling system, an upper roller and a lower roller are installed on the rack, one end of the rack is fixedly connected with a first motor, and the first motor is connected with the end of the lower roller through a reduction gearbox; and the other end of the lower roller is mounted on the bearing seat. The device further comprises a thickness acquisition module and a stress acquisition module. The thickness acquisition module and the stress acquisition module are used for monitoring the thickness and rolling pressure fluctuation of a rolled plate in real time, the control module is used for generating a corresponding fluctuation coefficient, and the thickness fluctuation coefficient and the stress fluctuation coefficient are comprehensively analyzed to generate an evaluation coefficient; and the roller spacing, the rolling speed and the working state of a cooling system are dynamically adjusted according to the evaluation result, so that the rolling process can adapt to material characteristics and working condition changes, the thickness uniformity of rolled plates is effectively improved, and the adverse effect caused by abnormal fluctuation of rolling pressure is reduced.

The invention discloses a production method of a non-annealing cold heading steel hot-rolled wire rod, and relates to the technical field of steel production, the method comprises the following steps: selecting a steel billet meeting the production specification requirement of the cold heading steel wire rod, and carrying out coping finishing and preheating treatment on the steel billet to be processed; the steel billet is conveyed to a large-compression-ratio rolling unit, the hot rolling process is monitored in real time, hot rolling segmented regulation and control are conducted, multi-pass temperature gradient rolling is achieved, and a cold heading steel wire rod formed through hot rolling is obtained; and the hot-rolled cold heading steel wire rod is conveyed to a heat preservation tunnel furnace, a cold heading steel wire rod finished product is obtained through segmented controlled cooling and surface treatment, and production of the annealing-free cold heading steel hot-rolled wire rod is achieved. According to the method, the advanced rolling mill unit with the large compression ratio is adopted for producing the cold heading steel wire rods of different specifications, the heat preservation tunnel furnace is adopted, the cooling temperature and the cooling speed of the wire rods are controlled, production of the annealing-free cold heading steel hot-rolled wire rods is achieved, the production process is greatly simplified, the production period is shortened, the production cost is reduced, and the production efficiency is improved.

The invention discloses a production control method, device and equipment for a strip steel production line, the strip steel production line comprises a temper mill and a withdrawal and straightening machine, and the method comprises the steps that the actual tension of the temper mill is obtained; based on the actual tension and the set tension of the temper mill, the detected tension deviation of the temper mill is determined; if the detected tension deviation of the temper mill is within a preset first tension deviation range, first early warning information is output; if the detected tension deviation of the temper mill is within a preset second tension deviation range and the duration is larger than a first duration threshold value, first alarm information is output, a roll gap between the temper mill and the withdrawal and straightening machine is controlled to be opened, and the lower limit value of the second tension deviation range is larger than the upper limit value of the first tension deviation range. The technical problem that the production efficiency of a strip steel production line is low is solved.

The invention provides a control method for the rolling force of a temper mill and related equipment, and relates to the technical field of metallurgical production, the method comprises the steps that pattern information of strip steel is obtained, and the pattern information comprises width information and thickness information; determining the height of an inlet and the height of an outlet of the anti-wrinkling roller based on the model information; determining the diameter of a working roll based on the model information; determining inlet tension and outlet tension according to the diameter of the working roll; and controlling the rolling process of the temper mill based on the height of the inlet of the anti-wrinkling roller, the height of the outlet of the anti-wrinkling roller, the inlet tension and the outlet tension.

The invention discloses a plate shape control method for a precipitation-hardening martensite SUS630 stainless steel cold-rolled steel strip. The technical problem that the plate shape of the steel strip is difficult to control is solved. The plate shape control method comprises the following steps that S1, hot rolling, annealing and acid pickling are conducted on a steel strip, the thickness of the steel strip is controlled to be 5.0-6.0 mm, and the width of the steel strip is controlled to be 900-2100 mm; s2, 304 stainless steel leading belts matched with the base metal in width and thickness are welded to the head and the tail of the steel coil correspondingly; s3, cold rolling is conducted on the steel strip through a rolling mill; and S4, the steel strip is corrected through a withdrawal and straightening machine, and the finished steel strip is obtained. According to the method, effective control over the plate shape can be achieved, it is guaranteed that the plate shape of the SUS630 cold-rolled, annealed and pickled steel strip is straight, the unevenness of the plate is smaller than or equal to 3 mm after the plate is flattened, and the use requirement of the steel strip is met.

The invention discloses high-nickel stainless steel cold rolling equipment with a scratch detection function for a support, and relates to the technical field of stainless steel cold rolling. The cold rolling equipment comprises a rack and a case, the case is located on the upper end face of the rack, a first mounting frame is arranged at the bottom of the case and located at the feeding position, and a guide mechanism and an adjusting mechanism are arranged on the inner side of the first mounting frame; an upper roller and a lower roller are arranged on one side of the first mounting frame, a cleaning mechanism is arranged on one side of the upper roller, a collecting roller is arranged on one side of the cleaning mechanism, and the guide mechanism is used for adjusting the feeding direction of stainless steel to ensure that the stainless steel can accurately enter a cold rolling position. The adjusting mechanism is used for guaranteeing the tension stability of stainless steel, the cleaning mechanism can effectively remove burrs and other impurities generated after stainless steel cold rolling, the product quality is guaranteed, the whole cold rolling equipment is compact in structure and convenient to operate, and the production efficiency and the product quality are remarkably improved.

The invention discloses a production process of high-strength anti-distortion cold-rolled strip steel. The production process comprises the links of raw material preparation, cold rolling, heat treatment, surface treatment and quality detection. Selecting medium-carbon steel with specific components as raw materials, and controlling the tolerance of hot-rolled strip steel; a six-roller unit is adopted for multi-pass rolling in cold rolling, and a plate shape control technology is matched; continuous annealing and gradient quenching-isothermal tempering are applied to heat treatment, so that a specific structure gradient is formed, and the distortion rate is reduced; the surface is subjected to acid pickling, hot galvanizing and a nano ceramic composite coating, so that the corrosion resistance and the wear resistance are improved; and the quality is guaranteed through online detection and sampling inspection. The strip steel produced through the technology is high in strength, good in toughness, high in corrosion resistance and suitable for the high-requirement field.

The invention discloses a cold rolling speed-rolling force-tension cooperative control system and method for a composite board, and the method comprises the steps: firstly, achieving the multi-step dynamic prediction of rolling key parameters through the time sequence feature extraction capability of a GRU network based on the cold rolling data of a multi-layer composite board, and achieving the feed-forward control through online optimization; a fuzzy PID self-adaptive compensation strategy is combined, so that the influence of external disturbance and parameter time variation is effectively inhibited; and the two methods are combined in a weighted fusion manner, so that the perspectiveness is ensured, the real-time disturbance influence is considered, and the cold rolling speed-rolling force-tension cooperative control of the composite plate is realized. According to the cold rolling speed-rolling force-tension cooperative control system and method for the composite board, the control effect is better, higher generalization ability and anti-interference performance are achieved, the control precision and stability of cold rolling of the multi-layer composite board are greatly improved, and the system and method can be widely applied to the cold rolling production process of the multi-layer composite board.

The invention relates to the technical field of metallurgical engineering, and discloses a cold-rolled strip steel deviation control method and device, and the device comprises a strip steel operation state monitoring module, a side guide roller dynamic regulation and control module, a multi-parameter collaborative optimization module, a fault early warning and self-diagnosis module, and a man-machine interaction control module. According to the method, strip steel edge position data are collected in real time through a high-precision laser distance measuring sensor array, the deviation amount is calculated through a dynamic weighting algorithm, and a three-level early warning mechanism is established based on material characteristics and technological parameters; a waste roller transformation technology is innovatively adopted, a scale breaker supporting roller is transformed into a self-adaptive side guide roller through a special welding process, and the transformation cost is reduced while the control precision is guaranteed. According to the method, the occurrence rate of scratching accidents caused by contact between the edge of the strip steel and equipment is reduced, double improvement of economic benefits and technical performance is achieved, and data support is provided for process optimization and quality tracing.

The invention relates to the technical field of rolling optimization, in particular to a ring-pull can aluminum foil rolling process parameter optimization method which comprises the following steps: ring-pull can aluminum foil rolling optimization: setting rolling speed and pressure to ensure uniform thickness and smooth surface; parameters are adjusted through multiple rounds of rolling, and a joint optimization cycle is established; microwave and electromagnetic heating are introduced, rolling and heating are iteratively optimized cooperatively, an optimal parameter combination is obtained, and the problems that due to the fact that the control precision of key parameters such as temperature and pressure is limited, non-uniform distribution of the thickness of aluminum foil and reduction of the surface quality in the ring-pull can production process are directly caused are solved. According to the technical scheme, the technical problems that in the prior art, the rolling process parameters of the aluminum foil of the zip-top can are controlled in a refined mode due to collaborative iteration optimization rolling and multi-stage heating, the thickness uniformity and the surface smoothness of the aluminum foil of the zip-top can are remarkably improved, and support is provided for comprehensively improving the quality of the zip-top can product are solved.

The invention discloses a rolling schedule self-adaptive calculation method and system based on a neural network, relates to the technical field of metallurgical industry automation and intelligent manufacturing, and solves the technical problem that self parameters are difficult to adjust and update by constructing a double neural network model according to newly generated incoming material data and an actual rolling schedule. Comprising the following steps: collecting incoming material data, performing logarithmic transformation on thickness data, introducing a thickness change rate as an input feature, then constructing a first neural network to predict the number of rolling passes, calculating a reduction rate and a tension parameter of each pass by a second neural network, and embedding a model into a production system to generate a rolling schedule in real time. And finally, new data and historical samples are integrated, a model is continuously optimized through data set construction, offline training and online learning, a Bayesian updating rule is introduced in an online learning stage, model parameters are dynamically adjusted in combination with the new data and historical knowledge, and self-adaptive optimization of the rolling schedule is achieved.

The present application discloses a cold rolling method for a steel strip and a 780Mpa grade cold-rolled dual-phase steel. The cold rolling method comprises providing a steel strip to be processed, pickling the steel strip to be processed; placing the pickled steel strip to be processed into a single-stand rolling mill, and rolling the steel strip to be processed back and forth in the single-stand rolling mill for n passes to prepare a 780Mpa grade cold-rolled dual-phase steel; wherein the reduction rate of each rolling pass is 6% to 25%, and the reduction rate of the i-th rolling pass is P i Less than the reduction rate P of the (i-1)th pass i‑1 , n and i are positive integers, 2≤i≤n. According to the cold rolling method of the embodiment of the present application, a 780 MPa grade cold-rolled dual-phase steel with a higher reduction rate and thinner thickness can be obtained by rolling.

The invention relates to a foil rolling device and method, a current collector, a pole piece forming method, a battery production system and a power utilization device.In the rolling process, a rolling mechanism is used for rolling a foil to the needed thickness, and then a rolling mechanism is used for rolling a first blank area of the foil in the tape conveying direction; and the first blank area has extension deformation in the tape conveying direction. The first blank area of the foil corresponds to the tab area of the pole piece, so that the tab area of the pole piece is equivalently extended in advance and has extension deformation quantity in advance during cold press molding of the pole piece, and the probability of wrinkling of a coating area due to excessive extension can be reduced. Besides, the calendaring of the tab area is advanced to the rolling process, and the calendaring mechanism is arranged at the downstream end of the rolling mechanism, so that heat generated in the rolling process can be fully utilized in the calendaring process, and the first blank area of the foil is easy to extend.

The invention provides an X-type six-roller mill plate shape forecasting method, and belongs to the technical field of metallurgical rolling. The method comprises the following steps: collecting equipment parameters of the X-type six-roller mill, strip characteristic parameters and corresponding rolling process parameters; dividing units and solving influence coefficients; solving the plastic deformation of the strip; carrying out iterative calculation on the roll system elastic deformation model and the strip plastic deformation model until convergence; forecasting the transverse distribution value of the pre-tensile stress of the strip during rolling; and strip outlet plate shape transverse distribution during rolling is forecasted. According to the method, on the basis of the strip plastic deformation model and the roll system elastic deformation model, the pre-tensile stress after rolling is calculated, and then strip shape forecasting is achieved.

The invention relates to a high-precision dynamic control method for wires and bars and a four-roller reducing and sizing rolling system, and belongs to the technical field of steel rolling. Aiming at the problems of insufficient dimensional precision, surface defects and low ovality of the existing two-roller and three-roller reducing and sizing mill, the invention provides a scheme for integrating a reducing rolling mill unit and a four-roller sizing mill, the single-pass compression ratio of the reducing rolling mill is 1.10-1.35, the single-pass compression ratio of the four-roller sizing mill is 1.001-1.10, and + / -0.001 mm precision control is realized by combining a dynamic roll gap adjusting system. Through an ellipse-circle-multi-section arc pass system, a roll gap compensation algorithm and Ki integral, the dimensional deviation is corrected in real time, finally, the dimensional precision of a finished wire and bar reaches + / -0.05 mm, the ovality is smaller than 0.05, the rolling speed is 140 m / s and 25 m / s at most, the service life of a roll collar is prolonged by 30%, and the production cost is reduced by 15%.

The invention discloses a control method for producing a 4J42 alloy plate strip in a hot rolling process. After the method is implemented, the smooth production of the 4J42 alloy plate strip can be ensured and the abnormities such as waste steel and faults can be avoided through heating temperature adjustment, rough rolling upwarp control and finish rolling reduction load strategy control, so that the Taihi steel hot rolling variety is expanded, and the product benefit of special steel alloy is improved.

The invention provides a bidirectional tension control withdrawal and straightening method for loose edge defects of a cold-rolled 2B plate, which comprises the following steps of: S1, acquiring transverse strain distribution data of the plate in real time through a distributed optical fiber strain sensor array at the sampling frequency of more than or equal to 10kHz; s2, inputting the strain data and the process parameters into a physical-data hybrid drive prediction model, and generating an optimized combination matrix of longitudinal tension sigma long and transverse tension sigma trans by the model through a neural network constrained by an embedded Hollomon elastic-plastic equation; s3, the magnetic field intensity of the magnetorheological fluid clamping roller is dynamically adjusted according to the optimization matrix, so that the transverse tension is continuously adjustable within the range of 0.1-50 N / mm < 2 >; s4, a multi-target reinforcement learning algorithm is adopted, model parameters are updated on line based on real-time defect detection data, and the loose edge elimination rate and the energy consumption index are balanced. The method has the advantages that longitudinal and transverse tension coordinated regulation and control are realized, the loose edge defect elimination precision is improved, and the real-time adaptability of the model is enhanced.

The invention discloses a method for solving middle rolling breakage in the finish rolling thin gauge rolling process in the hot rolling procedure, and belongs to the technical field of hot rolling. The method comprises the steps that the opening degree of a side guide plate before shearing and the opening degree of a side guide plate between finish rolling racks are subjected to segmented control through strip steel head threading, body rolling and tail steel throwing; in a finish rolling area, strip steel output by each rolling mill is detected, and when a detection result and a theoretical parameter exceed threshold values, AGC of the corresponding rolling mill is closed; the maximum accelerated speed of speed-increasing rolling is reduced; the height set value of the loop before and after the middle rolling rack is reduced, and the tension of the loop is increased. According to specific conditions, by adaptively adjusting the opening degree of the guide plate, the AGC, the maximum acceleration of accelerated rolling, the height of the loop and the tension of the loop, the defect that the middle is rolled to be broken in the finish rolling thin-specification rolling process in the hot rolling process can be reduced or even avoided.

The invention provides a strip steel rolling unit control method, device and equipment and a medium, and relates to the field of strip steel rolling. On the basis of the existing rolling mill thickness dynamic adjustment, the target speed compensation value is determined according to the target steel type and the target thickness reduction value of the target strip steel and the reference speed at the position of the rolling mill, the reference speed is compensated by the target speed compensation value, and the correction speed is obtained; and the passing speed of the strip steel is increased when the rolling mill rolls target strip steel. By adopting the technical scheme, the change value of the rolling thickness of the rolling mill can be increased by accelerating the speed of strip steel passing through the rolling mill and on the premise of ensuring stable rolling, so that the dynamic thickness change process of the rolling mill is accelerated, the number of consumed intermediate billets is reduced, and the waste of the intermediate billets is reduced.

The invention discloses a method for avoiding deviation and strip breakage in cold continuous rolling specification changing and related equipment, and relates to the technical field of automatic control in the rolling process. On the basis of the steel grade number, an adjustment plan suitable for rolling completion of the cold tandem mill is determined according to a preset steel grade transition rule, the preset steel grade transition rule is constructed on the basis of a steel grade material corresponding to the steel grade number, and the adjustment plan comprises production parameters of the to-be-adjusted steel; determining whether the steel grade materials of the adjacent steel grades in the adjustment plan meet a preset transition requirement or not; and under the condition that the steel grade materials of the adjacent steel grades meet the preset transition requirement, cold continuous rolling is conducted on the steel on the basis of the adjustment plan.

The invention provides a rolling mill vibration control method based on a mechanism analysis model, and belongs to the technical field of vibration control in the metal rolling process, and the method comprises the steps: determining energy transmission paths of a rolling mill vibration system, calculating the energy value of each energy transmission path, and calculating the energy value of each energy transmission path according to the energy value of each energy transmission path; the energy value of vibration is calculated through the law of conservation of energy; the energy value of vibration is used as a boundary condition for solving a kinetic equation, and a mechanism expression of vibration displacement is obtained through calculation; performing process analysis on the mechanism expression of the vibration displacement to obtain rolling parameter adjustment strategies in different states; and rolling mill vibration control is conducted on a rolling mill vibration system according to the rolling parameter adjusting strategies in the different states. According to the control method, the product quality of the strip steel is improved, and the production efficiency is improved.

The present invention relates to a method (100) and a device (10) for determining a target value (S) for a selected production parameter (P) of a rolling mill (200) with at least one rolling stand group (230) for rolling a metal product (12) into a metal strip (14), as well as a rolling mill (200) with such a device (10), a computer program product, and a machine-learned model (40). A value (W) of a material parameter (M) for a predetermined reference material is provided (S1). A correction factor (c2) for the material parameter (M) is determined by a machine-learned model (40) based on a recurrent neural network (42) using previously known production parameters (P*) in the metal strip production process (S3).The target value (S) for the production parameter (P) of the rolling mill (200) can then be determined on the basis of a physical production parameter model (52) which incorporates the material parameter value (W) adjusted with the correction factor (c2) and target specifications (Z) for the rolling of the metal strip (14) (S4).

The invention discloses a manufacturing method of ultra-thin oriented silicon steel with a high lamination coefficient, and belongs to the technical field of ultra-thin oriented silicon steel. By controlling the cold rolling procedure and the annealing procedure, the reduction rate and the tensile stress of a rolling roller in the cold rolling process, the tension in the annealing process, the temperature and the tension after annealing and other factors are specifically controlled, the strip breakage rate is reduced, the strip shape of the steel strip is controlled, and meanwhile the magnetism of the steel strip is improved; a steel strip straightening procedure after annealing is added, the steel strip temperature, the applied tension and the steel strip speed in the straightening process are controlled, the strip shape of the steel strip is further adjusted, the magnetism of the steel strip is improved, and the stacking coefficient of the ultrathin oriented silicon steel strip is increased. Wherein the stacking coefficient can reach 96% or above, the magnetic performance B8 reaches 1.70 T or above, the iron loss P1.5 / 400 reaches 9 w / kg or below, and the ultrathin oriented silicon steel strip which is good and stable in plate shape, good in magnetic performance and good in iron loss performance and ranges from 0.03 mm to 0.08 mm is obtained.

The invention discloses a method for controlling the C-shaped warping defect of eighteen-roller single-stand high-strength steel, and belongs to the technical field of solving the C-shaped warping defect of a steel plate. The method comprises the following steps: carrying out hot rolling, acid pickling and eighteen-roller reversible rolling on a descaled plate blank of a casting blank, the roller diameter difference between the upper roller diameter and the lower roller diameter of the middle roller of the eighteen-roller reversible rolling mill ranges from 2 mm to 5.5 mm, and the lower roller diameter is larger than the upper roller diameter. According to the method for controlling the C-shaped warping defect of the eighteen-roller single-stand high-strength steel, the roughness of the working rollers, the roller diameter difference of the middle rollers, the rolling force of the rolling mill and the strip steel tension are strictly controlled, the plate shape and stress problems in the rolling process are effectively controlled, and finally the warping height is controlled to be within the range of + / -(0.35-0.5) mm / m.

The invention relates to the technical field of coated steel plate production, in particular to a high-straightness coated steel plate and a production method thereof. During production, the following processes are controlled: 1) finishing, namely determining finishing inlet tension T1, finishing outlet tension T2 and finishing rolling force F according to the thickness h and yield strength sigma s of strip steel, and ensuring that a tensile stress value formed by a tension roller is greater than a pressure stress value formed by the rolling force; and 2) coiling: adopting double coiling mechanisms to ensure that the strip steel does not generate longitudinal warping when the strip steel passes through a second turning roller and is coiled. Based on the forming mechanism of the plate shape defect, stable control over the plate shape of the coated steel plate finished product is achieved by improving the finishing parameter adaptation degree and improving the coiling equipment and technology, and great significance is achieved for improving the straightness of the coated steel plate finished product and improving the production efficiency and product competitiveness of the coated steel plate.