Papers by Keyword: Shape Control

Paper TitlePage

Authors: Xiao Ping Zhang, Chang Jian Zhi, Bao Sun, Xiao Zhong Du, Jin Zhi Zhang
Abstract: Due to the coupled function of shape and gauge control in rolling process, mutual effects must be considered when shape control or gauge control is carried out. Traditional shape and gauge control theories are of independent and the control systems are also separated, so it is difficult to ensure the quality of shape and gauge simultaneously. Based on the updated shape theory and a single parameter model of load distribution method, a combined shape and gauge control method was developed, which can adjust rolling regulations on-line according to the deviation of strip crown measured at the exit of the rolling mill. The method can ensure gauge precision while strip crown is adjusted and the purpose of combined shape and gauge control is reached.
Authors: Zi Ying Liu, Yan Guang Sun, Xiang Rong Song
Abstract: This paper has researched traditional algorithms. The defects had been pointed out and proved. According to this, setup calculation algorithm was optimized. Considering strip transverse flow and creep deformation, natural output profile was defined. Practical applications in domestic 1500 hot strip mill show that the setup calculation strategy achieved good effect and enhanced the profile and flatness precision
Authors: Ju Bao Qu
Abstract: The workpiece processing is sometimes necessary to obtain details of the magnified image. Especially in the CAD, CAM and CNC applications in the field. This article constructs a rational quintic spline interpolation, and interpolation used in the image to enlarge, by the five local parameter interpolation function has the shape control performance, making the image zoom in or out of, according to the need for control. Experimental results show that the interpolation functions of the five constructed in effect in the workpiece, surface shape control.
Authors: Chul Kim, S. Hyun, M.H. Cho
Abstract: The shape changes by bending and twisting of a SMA/composite panel with embedded SMA wire actuators controlled by both electric resistive heating and passive elastic tailoring are investigated to realize the morphing wing of unmanned aerial vehicles. Three-dimensional finite element formulations are derived and used to analyze the behaviors of the SMA/composite smart structures. The numerical results show that the shapes of the SMA/composite panels can be controlled by judicious choices of control temperatures, SMA angles, and elastic tailoring. To validate the analytical results, two SMA-embedded curved panels are fabricated and then, their changes in shape are measured by a laser optical sensor when SMA is activated by electrically resistive heating. Both results show excellent correlation.
Authors: Zi Ying Liu, Yan Guang Sun, Xiang Rong Song
Abstract: This paper, aimed at Ganglu 1500 hot strip rolling project, developed advanced shape control system. Entry profile calculation strategy was developed. Natural output profile was defined. Profile distribution model based on the buckling limit was developed. Practical applications in domestic 1500 hot strip mill show that the setup calculation strategy achieved good effect and enhanced the profile and flatness precision
Authors: Yi Min Zhu, Yue Xin Han, Guo Liang Liu
Abstract: A precipitation-pyrolysis process was used for the synthesis of cubic nano-MgO powder. The main effect factors on the size and shape of nano-MgO powder such as mechanical stirring rate, organic reagent, and calcinations of the process were investigated. XRD and TEM were used to study on composition, morphology and size of nano-MgO powder. The results indicate that at the condition of mechanical stirring rate 510 rmp, glycol as organic crystal controller, calcination time 3 h, cubic nano-MgO powder was prepared with average size of 35 nm. FTIR results show that cubic nano-MgO powder has abnormal infrared absorption behaviors compared with that of micron scale.
Authors: Guang Hui Yang, Jie Zhang, Jian Guo Cao
Abstract: Aiming at the strip edge drop control, the three dimensional finite element roll system models were built. From the point of the burdened load and deformation of the roll system, the reason which caused the strip edge drop and its composing were analyzed, and the critical width was proposed to control the strip edge drop. Based on the FEM analysis and industrial experiment, the VCR (Varying contact backup rolls) matching the EDW (Edge drop control work rolls) was designed and proposed independently. The application of such rolls gives better mill crown control ability, a high performance of work roll bending force and the improved strip edge drop, crown and flatness quality.
Authors: Guang Hui Yang, Jian Guo Cao, Jie Zhang, Xiao Qin Yin, Sheng Hui Jia, Wei Zeng
Abstract: For gaining strip edge drop controllability and increasing roll grinding precision, the edge drop control work roll (EDW) was developed and designed in 1700 mm tandem cold rolling mill. During the rolling trial, the roll configuration between EDW and conventional backup roll didn’t match well because of the large fluctuation of strip edge drop, the lower shape control ability and non-uniform roll wearing, so the new roll configuration between EDW and varying contact backup roll (VCR) was proposed. After analyzing by finite element model, the result showed that the roll system configuration of VCR and EDW was better by 10.7% larger roll gap crown adjustable scope, 19.1% larger roll gap stiffness characteristics and 21.6% smaller pressure peak between rolls than before. The new roll system configuration has been applied to 1700 tandem cold rolling mill at WISCO after industrial testing.
Authors: Anna Ulyankina, Igor Leontyev, Nina Smirnova
Abstract: CuOx powders with diff erently shaped particles were firstly prepared via an electrochemical method by oxidation and dispersion of copper electrodes in an electrolyte solution under pulse alternating current (PAC). By means of X-ray diffraction (XRD) and scanning electron microscopy (SEM) the current density is found to have an influence on the morphology and composition of CuOx particles. Photocatalytic efficiency of CuOx towards methyl orange (MO) degradation under visible light was investigated. The prepared polyhedral particles show the best photocatalytic activity of 81 % towards MO comparing to octahedral and spherical particles with 70 and 61 %, respectively.
Authors: Zhan Fu Ma, Zi Wen Li, Xi Cheng Zhao, Mou Wei Li
Abstract: In the paper, the temperature distribution on the work roll surface of a 1750 hot strip mill is studied, and the variety rules of the thermal crown are analyzed. The result of test shows that the work roll thermal crown is significantly affected by cooling. The thermal crown obviously is improved after altering the distance between the cooling pipe and the work roll and changing the type of cooling water faucet. From this paper, it is known that different number of rolling coils cause different thermal crown of the work roll. The final change rule shows that the work roll thermal crown is the largest in Stand 1 and the smallest in Stand 6 in a rolling period.
Showing 1 to 10 of 36 Paper Titles