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Liu D.-H.,Beijing University of Technology | Zhang J.-L.,Beijing University of Technology | Liu Z.-J.,Beijing University of Technology | Wang Y.-Z.,Beijing University of Technology | And 4 more authors.

Effects of iron sand ratios on the basic characteristics of vanadium titanium mixed ores were investigated using micro-sinter and grey relational analysis methods. The results show that iron sandpresents poor assimilability, poor liquid flow capability, and low bonding phase strength. As the iron sand ratio in vanadium titanium mixed ores increases, the mixed ore’s assimilation temperature increases, the fluidity index of liquid decreases, and the bonding phase strength first rises and then decreases. The comprehensive index of basic characteristic (CI) improves and then deteriorates with increasing iron sand ratio. The CI of vanadium titanium mixed ores is optimized when the iron sand ratio is 9 wt.%. In order to make full use of low-price iron-bearing materials and improve the sintering characteristics of vanadium titanium magnetite, the iron sand ratio in vanadium titanium mixed ores should be controlled within 9–12 wt.%. © 2016 The Minerals, Metals & Materials Society Source

Liu D.,Beijing University of Technology | He A.,Beijing University of Technology | Wang H.,Hebei Iron & Steel Group | He L.,Hebei Iron & Steel Group
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering

In order to further study the relevance between the first and the second reserve bending in the process of parallel roller level of plastic hardening material. Roller level bending mechanical model is established based on hardening elastic-plastic material in accordance with the fundamental of engineering elastic-plastic mechanics. The stress relevance of the two reserve bending processes is described by analytical method and discussed out the changing process of residual stress distribution, moment and loading stress with the section bending process of the roller level. With this model it is demonstrated that moment ratio and curvature ration is not simple “M-C” relation any longer, but function related to the first curvature ratio, the second curvature ratio and hardening factors. It is theoretically proved the original curvature theory can not apply to multi-reserve bending leveling processes. Analytical results show that during the second reserve bending process, there are decreased elastic limit bending moment and the bending moment in leveling process but increased spring-back ratio. Considered hardening of the same material residual stress mean square deviation are 71.2 and 65.6, average rebound ratio are 0.49 and 0.43. ©2015 Journal of Mechanical Engineering Source

Liu D.-Y.,Beijing University of Technology | He A.-R.,Beijing University of Technology | Wang H.-B.,Hebei Iron & Steel Group | He L.-J.,Hebei Iron & Steel Group
Dongbei Daxue Xuebao/Journal of Northeastern University

According to the technical character of the cross-cutting process, the whole production line was divided to different tracking zones, and then the tracking task was further divided to two levels. After finalizing the overall scheme, design thought and data flow of the track function for the whole cross-cutting line, the binary and hexadecimal material status description methods were employed to manage the material tracking process. Based on this theory, an applicable material tracking system for cross-cutting process was designed, and the general program flow was described. Setting parameters is gradually sent, which solving the problem that two steel rolls can't be online at the same time. If no defect detectors are employed and the same technical flow is used with a certain factory, the annual output is predicted to increase 11% and the productivity is improved in indirectly. The long-time industrial application shows that this tracking system is reliable and accurate, and the problem of material information loses never happens, thus keeping the production line goes stably. ©, 2015, Northeastern University. All right reserved. Source

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