429results about "Roll force/gap control device" patented technology

The invention provides a finite difference-based rapid calculation method and system for an electromagnetic regulation and control roller shape and a rolling condition optimization method and system, and belongs to the field of rolling control. The roller shape rapid calculation method comprises the steps that size parameters, an electromagnetic rod loading form, a regulation mode, regulation parameters and rolling working condition environment parameters of an electromagnetic regulation roller to be regulated are obtained, a geometric model of the electromagnetic regulation roller is established, and the electromagnetic rod loading form, the regulation mode, the regulation parameters and the rolling working condition environment parameters are set in the geometric model; grid division is conducted on the geometric model of the roller, the finite difference theory is introduced, an electromagnetic regulation and control roller shape rapid calculation model is constructed, and temperature field distribution is rapidly solved and calculated through an LU decomposition method; and the roller shape is calculated according to the electromagnetic regulation and control roller shape rapid calculation model and the temperature field distribution. According to the method, online dynamic regulation and control of the electromagnetic regulation and control roller shape under parameter optimization is achieved, and the real-time performance and accuracy of the electromagnetic regulation and control roller shape are improved.

The invention relates to the field of steel rolling control, in particular to a cold continuous rolling high-pressure large-flow hydraulic energy-saving control method and system.The method comprises the steps that rolling system parameters and real-time data are collected and preprocessed, and basic data used for pressure regulation and control are obtained; carrying out model coupling analysis on the steel coil process parameters to obtain adaptive rolling pressure data; non-linear fusion evaluation is carried out on acceleration and thickness disturbance, and a self-adaptive dynamic safety margin is obtained; performing real-time synthesis on the adaptive rolling pressure data and the adaptive dynamic safety allowance to obtain dynamic target pressure setting data; and closed-loop energy-saving control is performed based on the dynamic target pressure setting data, so that the energy-saving effect of the hydraulic system is improved.

The invention relates to the technical field of high-speed cable shielding materials, and discloses a manufacturing method of rolled copper foil for high-speed cable shielding. The method comprises the following steps: preparing a copper plate; performing multi-pass cold rolling on the copper plate to form an elongated grain structure oriented along the rolling direction; performing controlled annealing on the cold-rolled copper foil to recover plasticity and inhibit complete recrystallization; the target thickness is obtained through finish rolling; carrying out finishing rolling on at least one surface of the copper foil by adopting a mirror surface working roller so as to reduce the surface roughness; and performing surface smoothing or passivating treatment to inhibit oxidation and performance degradation. Therefore, the obtained rolled copper foil has good ductility, structural stability and high-frequency performance.

The invention belongs to the field of profile steel production, and particularly relates to a rolling method of hot-rolled Q450NQR1 weather-resistant H profile steel, which adopts a reversible cogging mill and a universal finishing mill group for rolling: after the cogging mill rolls for 3-5 passes for cogging, a universal continuous rolling mill is adopted for finish rolling 9 continuous rolling, and the arrangement sequence of finish rolling hole patterns is U1-U2-U3-E4-U5-U6-U7-E8-U9; wherein the U3 and the U6 are curved web hole patterns, and the vertical roll is in drum-shaped design. The method has the advantages that one BD cogging mill is used for large-rolling-reduction rolling to crush crystal grains, and then the nine-rack universal continuous rolling mill is used for finish rolling, so that the metal flowing and steel biting conditions are improved. The grain structure is refined through large rolling reduction and low-temperature rolling, the problems that the Q450NQR1 weathering resistant steel is poor in metal fluidity, prone to cracking and the like due to alloy elements are effectively solved, and meanwhile the mechanical property, the size precision and the surface quality of products are guaranteed.

The application discloses a kind of automobile structure steel with yield strength 1000MPa and above and its manufacturing method, its component weight percentage is as follows: C 0.15~0.23%;Si 0.12~0.5%;Mn 1.6~2.4%;B 0.001~0.004%;Al 0.01~0.04%;Cr;0.05~0.5%;Mo 0.15~0.5%;P≤0.015%;S≤0.005%;Rest contains Fe and other inevitable impurities, and need to satisfy the following relationship: the eigenvalue Bs of lower bainite formation rate=0.6~1.4, Bs=(Mo+B*100-Mn / 5) / C;Its microstructure lower bainite≥95%.The automobile structure steel of the application has yield strength≥1000MPa, tensile strength≥1180MPa, elongation≥7%, 180° bending performance d≤3.5T.The automobile structure steel obtained by the application not only has ultrahigh strength, but also has excellent forming performance, especially bending forming performance, and is especially suitable for manufacturing automobile chassis system parts.

The invention relates to metal rolling equipment for aluminum plate machining, and belongs to the technical field of rolling machining. The metal rolling equipment comprises a horizontal roller and vertical rollers, and the vertical rollers are arranged on the two sides of the horizontal roller; the hydraulic cylinder is connected with the horizontal roller and used for adjusting stress of the horizontal roller. The vertical shaft is in sliding connection with the sleeve; the ends of the vertical shaft and the sleeve are located above and below the plate correspondingly, and the plate makes contact with the end of the vertical shaft or the end of the sleeve after moving in the vertical direction. The slide rheostat is arranged at the other ends of the vertical shaft and the sleeve; the slide rheostat is connected with the hydraulic cylinder. The device has the effect of automatically adjusting the bounce of the horizontal roller according to the plate thickness.

The present application relates to the technical field of super-thick marine steel resistant to corrosion in tropical marine climate, in particular to an EH40 super-thick marine steel resistant to corrosion in tropical marine climate and a manufacturing method thereof. The steel is composed of the following chemical components by weight percentage: C: 0.065%-0.08%, Si: 0.15%-0.3%, Mn: 1.5%-1.7%, P≤0.02%, S≤0.01%, Als: 0.015%-0.03%, Ni: 0.4%-0.8%, Cu: 0.1%-0.2%, Co: 0.1%-0.15%, Sn: 0.05%-0.15%, V: 0.01%-0.03%, Ti: 0.01%-0.015%, N: 0.002%-0.004%, and the rest is Fe and inevitable impurities. The thickness of the finished steel plate can reach 100 mm, while maintaining the high strength, high toughness and excellent weldability of the EH40 grade, the corrosion resistance of the steel in the tropical marine climate environment is significantly improved.

This invention provides a method for preparing titanium anode substrates for electrolytic copper foil. The specific steps are: Step 1, preparing titanium anode substrate ingots through two melting processes; Step 2, forging the prepared titanium anode substrate; Step 3, rolling the forged titanium anode substrate. The specific effects of this invention are: the titanium anode substrate prepared by the above method for preparing titanium anode substrates for electrolytic copper foil exhibits significantly improved microstructure and properties, and the enhanced lifespan of titanium anodes produced using this process is significantly increased. This process is relatively simple to operate, requires minimal equipment, and reduces the production cost of titanium anode substrates. It also increases the practical application and operability of this process.

The invention relates to rare earth steel for a 355MPa-grade hull structure and a preparation method of the rare earth steel, belongs to the technical field of metal materials, and solves the problems that the existing steel for the 355MPa-grade hull structure is poor in comprehensive performance and cannot meet the service requirements of high-end ships. The steel comprises the following chemical components in percentage by weight: 0.10%-0.15% of C, 0.20%-0.50% of Si, 0.70%-1.00% of Mn, 0.03%-0.10% of V, 0.10%-0.30% of Cu, 0.04%-0.08% of Mo, 0.10%-0.20% of Cr, 0.30%-0.40% of Ni, 0.003%-0.01% of Ce, less than or equal to 0.01% of P, less than or equal to 0.01% of S, less than or equal to 0.003% of O and the balance of iron and inevitable impurities. The prepared 355MPa-grade rare earth steel for the hull structure has obdurability and corrosion resistance at the same time.

Control system for cold rolling mills to improve sheet metal thickness uniformity. Sensors monitor the state of the cold rolling mill by measuring (i) roll eccentricity, (ii) roll slips during mill operation, (iii) mill disturbances from roll speed or roll force manifestations, and (iv) unknown disturbances referred to as process noise. The controller analyzes data from sensors to compensate. Data collected during the mill operation by the sensors are delayed in reaching the controller. This communication delay is accounted for by using a filter. Since an objective of the controller software is dynamic identification of eccentricity of the back up rolls, which is non-linear by nature, an Extended Kalman Filter may be used.

The invention discloses a rolling force calculation method for longitudinal wave rolling of a metal plate, and relates to the technical field of rolling. The rolling force calculation method for longitudinal wave rolling of the metal plate comprises the steps that based on rolling parameters of longitudinal wave rolling equipment and a neutral angle in the rolling process of the longitudinal wave rolling equipment, plastic deformation area rolling force at the wave trough position and the wave waist position of the longitudinal wave rolling equipment is determined; and the total rolling force of the plastic deformation area of the longitudinal wave rolling equipment is determined according to the rolling force of the plastic deformation area at the wave trough and the wave waist of the longitudinal wave rolling equipment. Accurate calculation of the total rolling force of the plastic deformation area is achieved, and the calculation efficiency of the rolling force is improved.

The application discloses a kind of electromagnetic regulation and control roller multi-section joint regulation method and device, it is related to plate strip rolling mill technical field. Including: the electromagnetic rod in the electromagnetic regulation and control roller to be regulated is carried out parameter regulation;Plate shape data after rolling is obtained to determine the electromagnetic rod to be regulated, and the regulation control roll gap shape is carried out;The electromagnetic rod needing to be carried out is obtained to be applied to outer section cooling and applied to outer section cooling;Electromagnetic rod is carried out electromagnetic regulation and control roll shape preset and obtains the undetermined coefficient of electromagnetic rod;According to undetermined coefficient, the actual regulation and control parameter matrix of electromagnetic rod is obtained by parameter matching of electromagnetic rod, and the multi-section joint regulation of the electromagnetic regulation and control roller to be regulated is completed.The application can carry out multi-section roll shape preset and parameter matching to the electromagnetic regulation and control roller of various forms electromagnetic rod, and feedback adjustment is carried out according to on-line detection data, and then the stability of electromagnetic regulation and control roll shape is ensured.

The invention relates to the technical field of metal material processing, and discloses a manufacturing method for continuous cast rolling of an aluminum strip for a 3104 aluminum louver, which comprises the following steps: S1, melting and refining 3104 aluminum alloy, and then stably conveying molten aluminum with the temperature maintained at 680-720 DEG C; s2, the molten aluminum is introduced into a high-frequency electromagnetic induction suspension molding area, the molten aluminum is suspended under the action of a main suspension coil, and a semi-solid strip blank with the solid outer layer and the liquid inner layer is formed; s3, the semi-solid strip blank sequentially passes through a non-contact high-energy ultrasonic energy field and an atomization cooling area; and S4, the treated semi-solid strip blank is guided into a flexible synchronous rolling roller to be rolled, and the strip with the set thickness is obtained. The semi-solid strip blank is formed by the molten aluminum in a non-contact state in an electromagnetic induction suspension mode, direct contact between the molten aluminum and a low-temperature mold is avoided, and therefore formation of strip surface defects caused by the chilling effect is restrained.

The present application belongs to the technical field of steel production, and provides a method for improving the elongation of low-carbon steel produced by thin strip casting and rolling. The method improves the uniformity of the cast strip structure by low superheat casting, refines the grains by large reduction ratio low-temperature rolling, and cooperatively suppresses the precipitation of grain boundary carbides by low-C composition and fast cooling after rolling, so that the average grain size of the finished product is controlled to be 10-30 μm, the length proportion of grain boundary carbides is controlled to be ≤15%, and finally the elongation is improved from less than 30% to more than 38%. The present application is completed on-line, does not add micro-alloy elements, and does not require off-line annealing. Through the synergistic regulation and control of grain refinement and grain boundary carbide morphology, the plasticity of the low-carbon steel produced by thin strip casting and rolling is significantly improved, and the performance can meet the requirements of secondary bending and deep drawing. At the same time, the advantages of low energy consumption of the thin strip casting and rolling short process are maintained, and the present application is suitable for stable industrial production.

The application provides a kind of LPG ship low yield ratio high strength low temperature steel plate and manufacturing method, the component of the steel plate is as follows according to percentage by weight: C:0.060%~0.140%, Si:0.25%~0.60%, Mn:1.20%~1.60%, P≤0.007%, S≤0.004%, V:0.050%~0.150%, Nb:0.050%~0.100%, N:0.0150%~0.0190%, Cu:0.45%~0.80%, Ni:0.65%~0.95%, Ti:0.010%~0.030%, Als:0.025%~0.045%, Zr:0.080%~0.150%, the balance is Fe and inevitable impurities.Manufacturing method, including smelting, continuous casting, reheating, slab cooling, rolling, on-line accelerated cooling, stack slow cooling;The steel plate produced by the application has yield strength ≥540MPa, tensile strength ≥685MPa, elongation after fracture ≥24.0%, yield ratio ≤0.83, impact energy at-80℃ ≥260J, CTOD at-40℃ ≥1.30mm or more, and yield ratio of steel plate at-40℃ ≤0.80.

The invention provides a hot continuous rolling and finish rolling force prediction method fusing machine learning and a mechanism model, and relates to the technical field of metallurgical process control. By integrating a flow stress mechanism model based on a physical metallurgy rule and a data-driven XGBoost machine learning model, the interpretability of the mechanism model and the fitting ability of machine learning to a complex nonlinear relationship are fully exerted; based on a competitive mechanism between a work hardening effect and a recrystallization / phase change softening effect in a metal deformation process, flow stress mechanism model parameters are optimized by taking a flow stress measured value as a target under the guidance of a PSO optimization algorithm, physical mechanism constraints are embedded, and it is ensured that an optimization result conforms to physical reality; according to the method, key variables of chemical components and process parameters are used as input, a machine learning model for softening rate prediction is established based on an XGBoost algorithm, and a prediction result is used as key parameter input of a mechanism model, so that model precision attenuation caused by working condition change is effectively avoided.

The invention discloses a wide and thin steel plate with excellent low-temperature toughness for a 355MPa-grade low-temperature engineering structure and a manufacturing method of the wide and thin steel plate, and belongs to the technical field of low-carbon microalloyed steel production. The steel plate comprises the following chemical components in percentage by weight: 0.05%-0.08% of C, 0.2%-0.25% of Si, 1.45%-1.55% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.02%-0.04% of Nb, 0.010%-0.04% of Al, 0.003%-0.006% of N and the balance of Fe and inevitable impurities, and the total amount of other impurity elements is less than 0.05%. The manufacturing method comprises the steps of molten steel smelting, external refining and degassing, continuous casting, slab reheating, rolling and controlled cooling. The steel plate is low in cost, high in strength and toughness and capable of meeting the service safety of the steel plate for the engineering structure under the condition of-60 DEG C.

This invention relates to the field of intelligent rolling technology, and discloses an intelligent rolling method and system for aluminum-based bimetallic bearing materials based on three-roll differential rolling. The method includes: acquiring real-time multidimensional variable data of three-roll differential rolling; obtaining principal component eigenvectors by dimensionality reduction after normalization and principal component analysis; constructing a reconstruction matrix and calculating the squared Euclidean norm of the residual matrix as the squared prediction error value; analyzing the contribution if the error exceeds a threshold, locating the precise coordinates of the profile deviation; maintaining the original parameters if the error does not exceed a threshold; generating adjustment parameters and compensation commands through a roll elastic deformation model based on the mill geometric data, and outputting them to the drive system; calculating the dynamic following error, performing secondary compensation for exceeding the threshold, and finally obtaining optimized rolling parameters. This method can achieve precise positioning and targeted compensation of rolling profile deviation, ensuring stable product quality.

A method for manufacturing a pearlitic steel rail having high surface hardness, relating to the technical field of iron and steel smelting. The method comprises: feeding molten steel having undergone preliminary smelting into a ladle refining furnace, and adding an alloying element for deoxidization and alloying treatment to obtain refined molten steel, so as to further obtain a continuous casting billet; heating the continuous casting billet to a preset temperature by means of a heating furnace, and feeding the heated continuous casting billet into a rolling mill for multi-pass rolling comprising first-pass rolling and second-pass rolling, wherein during the first-pass rolling, the rolling speed is 5.0-7.5 s-1, and the rolling deformation should be 10-15%; after the first-pass rolling, the original austenite grain size is 85-115 μm; and the number of rolling passes is 9-13, and the total deformation is 85-95%; and gradually reducing the gap between rollers of the rolling mill to obtain steel rail blocks having desired specifications and shapes and performing on-line heat treatment and processing treatment on the steel rail blocks to obtain steel rails.

This invention relates to a high-precision, fast-response thickness control method for a hot strip rolling mill. The hot strip rolling mill includes N sets of roll mechanisms, a reduction system, a frequency conversion system, and a thickness control system. The thickness value of the strip after being rolled by the roll mechanisms is input to the thickness control system. The high-precision, fast-response thickness control method for the hot strip rolling mill includes the following steps performed by the thickness control system: receiving the thickness deviation through a feedforward predictive control regulator F, and calculating the intermediate value K. G And based on the intermediate quantity K G The thickness feedforward estimated adjustment amount is calculated and output. The thickness deviation is received by the thickness feedback proportional-integral controller M. The calculated thickness feedback proportional-integral adjustment amount is then output. The thickness feedforward estimated adjustment amount and the thickness feedback proportional-integral adjustment amount are superimposed by an overlay device to obtain the roll gap adjustment amount ΔG, which is input into the roll adjustment mechanism of the pressing system. This effectively solves the problem of thickness step fluctuation in strip steel caused by uncontrollable factors.

The application relates to the technical field of steel metallurgy finishing rolling mills, and particularly discloses a finishing mill precision detection and improvement method, which utilizes the power of an upper supporting roller balancing device to lift the upper supporting roller to be pressed on an upper step pad base plate and a step pad, measures and calculates the horizontal height of two ends of the supporting roller, and determines the wear and corrosion of the part above the upper supporting roller; the elevations of a portal bottom surface, a lower step pad upper surface and a lower supporting roller upper surface are measured respectively, and the wear and corrosion of the part below the lower working roller are determined; the finishing mill precision detection and improvement method designed by the application does not need to be disassembled and measured offline in a large number of devices, can be implemented during the time of regular maintenance, saves a large amount of time, can accurately determine the positions where the vertical direction deviation of the rolling mill is generated online, and takes different temporary treatment measures according to different positions, improves the precision of the rolling mill, and controls the precision of the rolling mill within the range required on site.

The invention relates to the technical field of metal pressure processing control, and discloses a rolling system for titanium alloy rod and wire composite production, which comprises a basic rolling unit, a rolling unit and a control unit, the signal synchronous acquisition module is used for acquiring the pressure and displacement of the hydraulic cylinder; the feature extraction and state arbitration module is used for judging a steady-state interval or an unsteady-state interval; the rheological impedance analysis module is used for resolving an instantaneous plastic rheological modulus in an unsteady state interval; high-frequency excitation is actively injected into a steady-state blind area through the micro-disturbance active detection unit, the steady-state rheological modulus is inversed through phase-locked demodulation logic, a sensing blind area caused by natural fluctuation deficiency of a traditional control system in an extremely steady state is avoided, the stability of the system is improved, the stability of the system is improved, and the stability of the system is improved. Full-time-domain accurate matching of rheological properties of the titanium alloy material is achieved, and under the condition that a heat compensation device is not needed in the whole line, the rolling problem of 5.0 mm extremely-small-specification wires and large-coil heavy coiled materials is solved.

Provided are a high-strength thin-gauge checkered steel plate / strip comprising the following chemical elements in weight percentages: C: ≤0.06%, Si: ≤0.5%, Mn: 0.4-1.7%, P≤0.04%, S≤0.007%, N: 0.004-0.010%, Als: <0.001%, B: 0.001-0.006%, Mn / S≥250, total oxygen [O]T: 0.007-0.020%; Cu: 0.1-0.6% and / or Sn: 0.005-0.04%; and a balance of Fe and other unavoidable impurities, and a manufacturing method thereof. The resultant steel roll can be used directly as hot-rolled checkered plate / strip, or as a finished checkered plate / strip after being cut and finished, and is widely applicable to the fields of architecture, mechanical production, automobile, bridges, transportation, ship building, etc.

The application discloses a wear-resistant steel plate and a preparation method thereof, and belongs to the technical field of steel material processing. The chemical component composition and mass percentage of the wear-resistant steel plate are as follows: C: 0.85-1.20%, Si: 0.12-0.40%, Mn: 7-11%, P: 0.015% or less, S: 0.003% or less, Cr: 1.0-3.0%, Mo: 0.12-0.35%, V: 0.020-0.040%, Al: 1.6-2.3%, and the balance of Fe and inevitable impurities; the preparation method comprises the steps of preheating, low-temperature heating, rolling and rapid water cooling. The steel plate provided by the application has low cost, a simple preparation process and excellent comprehensive mechanical properties, and does not need heat treatment; the steel plate has low density and excellent wear resistance, and can be applied to related fields with high wear resistance requirements.

The application discloses a preparation method of a 1.5mm hot-rolled 800MPa-grade weather-resistant photovoltaic support steel in the field of hot-rolling steel production, and the method comprises the following steps: adopting a steel grade component with 800MPa-grade weather resistance, controlling the thickness and length of the steel casting blank; adopting a hot feeding and hot charging mode for heating; rough rolling and finish rolling are carried out; laminar cooling is carried out on the steel strip after finish rolling; and finally, coiling is carried out. The application adopts a plate blank with a proper length, which is beneficial to reducing the temperature difference of the intermediate blank and the head and tail of the steel coil, the hot feeding and hot charging mode is adopted for heating, the core temperature of the plate blank can be improved, the rolling is stable, the rough rolling is carried out for four passes, the temperature drop at the entrance of the finish rolling is further reduced, and through reasonable control of the rolling speed, the plate crown, the loop amount, the bending force and the roll shifting amount and other processes in the finish rolling process, the 1.5mm thick hot-rolled steel plate has the advantages of good rolling stability, good weather resistance and excellent comprehensive performance, and the production efficiency and the yield of the extremely thin gauge hot-rolled high-strength weather-resistant steel plate can be improved.

The roll condition monitoring device is provided with: a rolling load detecting mechanism configured to detect a rolling load signal of a monitoring object roll selected from among an upper roll set including at least one roll and a lower roll set including at least one roll, in a case where a roll material is rolled between the upper roll set and the lower roll set; a signal extracting mechanism configured to extract a rolling load high frequency signal having a frequency of a predetermined prescribed frequency or more from the rolling load signal; and a roll condition determining mechanism configured to determine a condition of the monitoring object roll based on a test result of a statistical test method for a plurality of rolling load values included in the rolling load high frequency signal.

The invention belongs to the technical field of rolling mill rolling thickness compensation, and particularly discloses a rolling mill rolling thickness compensation control method based on an AGC (automatic gain control) hydraulic oil cylinder system, which comprises the following steps: cutting a continuous steel plate into independent infinitesimal elements with time sequence identifiers, accurately calculating the residual stroke of each infinitesimal element to a roll gap through real-time speed integration, and when the rolling speed changes drastically, controlling the residual stroke to be equal to or smaller than the residual stroke of each infinitesimal element. According to the method, the actual time when each infinitesimal arrives at the roll gap can be accurately mapped, and the accurate synchronization of the triggering time of the compensation instruction and the spatial position of the infinitesimal is ensured; preorder infinitesimal elements which are rolled are utilized to predict rolling force sudden change caused after the infinitesimal elements needing to be compensated enter the roll gap through roll force change response of the roll gap, roll gap compensation is triggered only when the rolling force sudden change is predicted to be caused, and online verification of thickness deviation disturbance effectiveness is achieved. Redundant adjustment and extra system disturbance caused by blind compensation can be avoided to the maximum extent.

The invention discloses a multi-stage casting purification and asynchronous rolling integrated process of an aluminum alloy sheet, which comprises the steps of multi-stage casting purification, asynchronous hot rolling, high-processing-rate cold rolling, low last-pass reduction rate and optimized intermediate annealing, specifically, the casting purification adopts mixed refining of a sodium-free refining agent and argon, online degassing and two-stage filtering; the high purity of the melt is ensured; the asynchronous hot rolling adopts a pass distribution mode of front-section large reduction and rear-section small reduction; the total machining rate of cold rolling is 71%-80%, and the reduction rate of the last pass is smaller than or equal to 15%; and the intermediate annealing adopts a three-section temperature control process. The method effectively solves the problems of low melt purity, high plate anisotropy and poor surface quality in the traditional process, and realizes green and efficient production of the aluminum alloy thin plate with low earing rate (less than or equal to 5%) and high surface quality.

The invention discloses rolling equipment and a control method thereof.The rolling equipment comprises an uncoiler, a rolling mill unit, a hydraulic system, a detection device and a central controller, a base metal coil is arranged on the uncoiler, and the uncoiler is used for driving the base metal coil to unfold; the rolling mill unit is arranged at the downstream of the base metal coil and is provided with at least one group of paired working rollers; the hydraulic system is connected with at least one of each group of working rollers and is used for applying pressure to the working rollers, and the pressure applied to the working rollers by the hydraulic system is dynamically adjustable in the rolling process of the rolling mill unit; the central controller is in signal connection with the detection device and the hydraulic system, and after a preset curve of the coiled material is obtained, the hydraulic system is controlled to roll the coiled material in the rolling direction according to the preset curve. And based on the real-time deviation of the thickness of the coiled material at the actual outlet of the detection device and the target thickness curve, a thickness compensation instruction is generated, and the hydraulic system is controlled to dynamically adjust the roller gap and pressure between the working rollers according to the compensation instruction.

The application discloses a low-cost 420MPa-grade hot-rolled wheel steel and a preparation method thereof, and belongs to the field of materials and metallurgy technology, and comprises the following components in percentage by weight: C: 0.12% to 0.16%, Si: 0.05% to 0.10%, Mn: 0.80% to 0.90%, P: 0.020% or less, S: 0.015% or less, Al: 0.018% to 0.033%, N: 0.0035% to 0.0055%, and the balance of Fe and inevitable impurities, and 0.25 <= (C+Mn / 6) <= 0.30. The low-cost 420MPa-grade wheel steel plate with a thickness of 10 to 25 mm is realized, and the wheel steel plate has the characteristics of excellent low-temperature toughness, high surface quality, low cost, high strength and toughness and the like, solves the problems of high alloy cost and the like, and can guarantee the service safety of the wheel steel plate.