Papers by Author: Feng Shan Du

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Authors: Hua Gui Huang, Wei Wang, Feng Shan Du
Abstract: The spiral mark is one of the quality defects on the tube surface in cone-type rotary pericing process. In this paper, the numerical simulation study was carried out for cone-type rotary piercing process using rigid-plastic finite element method. From the simulation results, the axial load applied on piercing plug and mandrel bar were then obtained. Taking the elastic deformation of mandrel bar into consideration, the variation of plug location under axial load during pericing process and the non-homogeneous wall thickness were investigated. The formation mechanism of the spiral mark on the tube surface can be found in the obtained results.
Authors: Min Ting Wang, Xue Tong Li, Feng Shan Du
Abstract: To investigate the effect of laminar cooling parameters on temperature field and heat transfer coefficient, an experiment platform for analyzing laminar cooling is designed and made by the author. Making use of the equipment, the cooling experiments with the various cooling conditions have been carried. Based on the experimental results, the effects of different water flows and water temperature on cooling rate are presented in this study. And it can be found that adding impurities into cooling medium is an effective way to improving the cooling rate. The research achievements have a certain reference value for setting parameters in laminar cooling process of heavy plate.
Authors: Xue Tong Li, Min Ting Wang, Feng Shan Du, Yong Gang Cui
Abstract: Against 4100 heavy plate miller, a 3-D rolling model involving rolls’ elastic deformation and workpiece’s elastic-plastic deformation is established using large deformation elastic-plastic finite element method. The distributions of the rolls’ bending deformation and the roll gap shape by simulation under the different processes. The results can provide the practical referential value for equipment design and processing setup of heavy plate mill. The FE model may be used to analyze skinning process on off-line.
Authors: Hua Gui Huang, Huan Ping Zheng, Feng Shan Du, Wen Zhang Wang
Abstract: The size and roundness tolerance are common defects of the heavy caliber seamless tube after rolling and heat treatment. In order to disclosure the straightening mechanism of the heavy caliber seamless tube with ten cross rollers straightening machine, a nonlinear finite element model was set up on the platform of MSC.MARC. In this model, a heavy caliber seamless tube of Φ750 × 37 mm with initial roundness tolerance was used. The simulation results show that, the roundness tolerance declined from 1% to 0.2% after straightening, so that the initial roundness tolerance was almost eliminated. And the strain and stress distribution of the tube, the straightening force fluctuating caused by the roundness tolerance were presented and discussed. The analysis results obtained may provide a theoretical foundation not only for establishing the straightening process, but for the machine structure designing.
Authors: Pei Zhang, Feng Shan Du, Zhi Qiang Xu, Ling Ling Zhao
Abstract: A stochastic mathematic model contained the effects of dendrite morphology, solidification shrinkage and dissolved gases was formed to simulate microporosity formation and growth. Microporosities appear in the interspaces of primary dendrites as well as secondary dendrites from microscopic view of A356 aluminum alloy experimental ingot with a metal mold. In the past literatures it took the volumetric fraction of microporosities as a function of the local density. In the present work a single pore size and distribution were predicted concerning the combination of shrinkage and dissolved gases and dendritic spacing. The dendritic spacing is a main parameter to decide the pore pattern. For shrinkage and dissolved gases causes, the favorable one is determined by dendritic spacing, also the local cool rate and tip growth rate. The dense degree of the experimental ingots in different casting conditions was discussed. The variations of dens degree from the measured values in different casting conditions are similar to that of porosity volume fraction from the predicted results.
Authors: Xue Tong Li, Zhao Meng Huang, Min Ting Wang, Feng Shan Du
Abstract: A numerical simulation model for vertical-horizontal rolling process in roughing trains is built according to 3-D rigid-plastic finite element method (FEM), which is validated by comparing the simulation results with measured ones of industrial production. The principle of width deviation appearing on head and tail of slab is investigated by the finite element (FE) simulations. A new polynomial short stroke control (SSC) model is developed based on the comprehensive simulation results and the analyzed results show that, at the aspect of width control, the new SSC model is more effective than the two line one.
Authors: Feng Shan Du, Jie Li, Jun Kai Fan, Yuan Li, Tian Yu Tan
Abstract: On the basis of the principle of hydrogen pressure, this paper makes a comprehensive research about coupling effect of the stress field in the micropores in the condition of hydrogen pressure. According to the equation of Kazinczy Pokinger, calculation model of hydrogen pressure strength of the micropores in the heavy forgings is established with the temperature and hydrogen content. Summarize the relative position of crack in the forgings into four combinations, and use the finite element software to analyze the coupling strength of four different combinations of cracks under hydrogen pressure stress field. Analysis results show that, different relative position relationship between cracks and the size of the micro cracks have different effect on coupling effect of hydrogen pressure stress field in micro cracks.
Authors: Fei Xue Wang, Feng Shan Du, Hui Yu
Abstract: Based on the characteristics of PQF deformation process, a thermal-mechanical coupled model of this process is established by the three-dimensional elasto-plastic finite element method. The simulation according to practical rolling process of a certain factory is completed. Some important parameters such as the finished size of the rolled product, the temperature variation curves of the key nodes on the tube, the rolling force and torque of each roller are predicted during this simulation. Comparison between simulation solutions and experiment results shows a good agreement, which means this model is capable of simulating PQF deformation process as well as forecasting product quality.
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