Shape Of Steel Plate Research Articles

Prediction of roll wear and thermal expansion based on informer network in hot rolling process and application in the control of crown and thickness

The inaccuracy of roll thermal expansion and roll wear settings affects strip steel plate shape and thickness in hot-rolling process. Roll wear and thermal expansion are nonlinear time series that cannot be neglected in the roll engineering. In order to make up for the shortcomings of the existing models, a novel prediction model of roll thermal expansion and roll wear based on Informer is developed. Firstly, multiple experiments are conducted to determine hyperparameter such as training epoch, dropout, batch size and learning rate. Then, the predicted results of finishing mill group (F1–F7 stand) are compared with the long-short-term memory (LSTM) model, the artificial neural network (ANN) model and the recurrent neural network (RNN) model. The results show that the model based on Informer network has highly accurate in predicting roll thermal expansion and roll wear. Finally, the application results show that the hit rate is 98.412 % within the tolerance range ± 4 μm and the hit rate within the ±40 μm thickness tolerance deviation range reach 98.94 % which proves that the roll wear and thermal expansion model based on Informer has outstanding advantages in the hot rolling shape control system.

A study on shape of electromagnetic guideway for continuous steel plates by analysis of multi-body dynamics

To obtain the static shape of the continuous steel plate and vibration characteristic, we performed the analysis of the multi-body dynamics in which the continuous steel plate was discretized in many solid bodies. The shape of the steel plate obtained by the measurement experiment was agreement with the static shape of the steel plate obtained by the analysis. Then, dynamical analysis was performed when white noise input to the steel plate. It was confirmed that the vibration could be suppressed when the electromagnets were installed in consideration of the static shape of the steel plate.

Large-diameter single dowel joint: finite element modelling of a reinforced joint

Finding new efficient connectors or improving existing ones are important issues in timber construction. This research investigates an innovative large-diameter dowel-type connection by using a finite elements model calibrated with experimental results. This connection is made of a large-diameter single dowel reinforced by means of a steel plate with a vulcanised rubber layer. The steel plate shape, thickness and dimensions, the rubber stiffness, the steel mechanical properties, etc., are parameters that may influence the critical load of the plate. The joint load-bearing capacity is also highly depending on the load direction to the grain. Those parameters are investigated using FE modelling and discussed in order to propose design recommendations.

Non-contact guide system for travelling elastic steel plate (Optimal placement of electromagnets by analysis of steel plate shape)

AbstractIn a factory, continuous thin steel plates are supported by a series of rollers during such processes as plating and rolling. Because the rollers come in contact with the steel plates, the problem of surface quality deterioration arises. To solve this problem, we developed a non-contact guide system for parts of the steel plate where the travelling direction changes by applying an electromagnetic force and experimentally examined the effectiveness of the system. In this study, the shape of the travelling steel plate is calculated by numerical analysis. Based on the results, we confirmed the validity of the proposed system.

Effect of a magnetic field from the horizontal direction on a magnetically levitated steel plate: Fundamental consideration on the levitation performance

Thin steel plates are widely used in various industrial products. However, they have problems of flaws in the coating caused by contact support during transport, and deterioration of surface quality. As a solution to these problems, a noncontact transport of steel plates using electromagnetic force has been considered. However, there is a risk that side slipping or dropping of the plate may occur owing to inertial force because the levitation control system does not provide a restraint for the direction of travel. Therefore we have proposed the addition of electromagnetic actuators to control the horizontal motion of levitated steel plate. In this study, we calculated the shape of steel plate with horizontal attractive force using the Finite Difference Method (FDM). We carried out basic experiments to discuss the effect of a horizontal attractive force applied to the stationary levitated steel plate on its elastic vibration. The result shows that the application of a magnetic field in the horizontal direction was confirmed to suppress deflection in the levitated flexible steel plate. In addition, the application of a magnetic field in the horizontal direction improves the levitation stability of steel plates.

Vibration Suppression Effect in a Bending-Levitated Flexible Steel Plate by the Electromagnetic Force

We have proposed a method of levitating a thin steel plate by moderately bending it beforehand. To elucidate the bending levitation performance, an ultrathin steel plate was levitated; the relationship among the tilt angle of the electromagnets, the standard deviation of the displacement, and the levitation probability was evaluated. Furthermore, to elucidate the effective tilt angle of the electromagnets for bending, the steel plate shape was analyzed using the finite difference method (FDM). When levitating the thin steel plate at the optimal tilt angle of the electromagnets attained by the FDM, a desirable levitation performance was achieved robustly.

Thicker steel plate shape-changing law and control method during the snake rolling process

The shear stress produced in the deformation region during the asymmetrical rolling process is helpful for deformation penetrability into the steel’s inner region, and then the grain can be refined. Thick steel plate shape problems can appear after asymmetrical rolling, and the snake rolling method was invented to solve the problem. The roll speed ratio, roll offset, threading strategy and roller table can affect the steel plate shape after rolling, and in-depth research on the plate shape-changing law was conducted. Asymmetrical rolling and the snake rolling process were simulated by the FEM commercial software ANSYS and the plate shape-changing law was obtained by analysis. Steel plate bends significantly with an increase in the roll speed ratio for asymmetrical rolling, but it cannot be bent any more when the roll speed ratio is up to 1.15. The optimal roll offsets are 12 mm, 20 mm, 22 mm and 22 mm when the roll speed ratios are 1.15, 1.10, 1.15 and 1.20, respectively. The optimal roll offset is 22 mm when the roll speed is up to 1.15. The stability of the rolling process and steel plate shape of the head can be improved when a synchronous threading strategy is used. The roller table can also play a positive role in improving the steel plate shape after rolling.

방향 선택형 에지검출 알고리즘 기반의 RM존 캠버 모니터링 시스템

In this paper, we propose camber monitoring system which is using on hot rolling process. In roughing mill which is one of the rolling part in hot rolling process, steel plate can be bended in width direction under the imbalance of rolling condition. This bending of steel plate in width direction is called as camber. In order to measure the camber, first, cameras which are installed over transport pathway of steel plate take pictures of whole shape of steel plate. And location value of steel plate edge is extrated from these pictures by edge detection algorithm. But, there are a lot of noises which are generated by such as water sprays, dusts, peripheral equipments in these pictures, and these noises make edge detection difficult. In order to solve this kind of problem, we developed a direction selective edge detection algorithm, and applicated in our camber monitoring system. As a result, we got stable results in spite of process noises.

柔軟鋼板の湾曲浮上制御

In the transport system of a thin steel plate production line, the quality of the plate surface deteriorates over time because of contact with rollers. However, when a flexible thin steel plate is targeted for levitation, levitation control becomes difficult because the thin plate undergoes increased flexure. To solve this problem, we propose a levitation of a flexible thin steel plate that is bent to an extent which does not induce plastic deformation. In this paper, to elucidate the bending levitation performance, ultrathin steel plate with a thickness of 0.18 mm is levitated and the relationship between tilt angle of electromagnets, standard deviation of displacement and levitation probability is evaluated. Furthermore, shape of steel plate is analyzed using finite difference method and effective levitation angle is estimated. As a result, when levitating thin steel plate at the optimal tilt angle of electromagnets attained by finite difference method, desirable levitation performance can be achieved.

Deformation Control in Wear-Resistant Steel Quenching Process

Computation model for TNM360 wear-resistant steel quenching process is established by finite element method. Four work conditions are designed for studying the effect of different location of cooling zone on quenching plate shape. And the temperature field and stress-strain field under four work conditions are calculated through the established model. For 20mm thick steel plate, the effect of uneven cooling of the front of cooling zone on the plate shape is larger than that of the rear of cooling zone. Under different work conditions, the effect of thermal stress on plate shape is different with phase transition stress. The results of the study provide important theoretical basis to control wear-resistant steel plate shape and improve production efficiency and manufacturing yield.

Analytical theory for shape stiffness

The shape stiffness of millm is defined as the crosswise rigidity of the unit width of steel plate, that is,m=k/b. By differentiating the steel plate crown equation in the vector model of steel plate shape, a new concise equation for the shape stiffness,k c=m+q, is obtained. Furthermore, by combining the calculation equation for steel plate crown derived from Castigliano’s theorem, an analytical calculation equation for the shape rigidity of rolled steel plate is derived. The correctness and practicability of the theory for the shape stiffness are demonstrated by comparing the results from the numerical calculation with the practical data of a rolling mill.