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| 1 | Quantitative Prediction of Reduction in Large Pipe Setting Round Process显示文摘The control manner during the process to ensure the quality of pipe products mainly relies on the operator's experience, so it is very necessary to study the setting round process and obtain its spring-back law. The setting round process is shaping an oval section pipe into circular section, so it is difficult to provide a quantificational analysis for its spring-back process because of the curvature inequality of pipe section neutral layer. However, the spring-back law of the circle-oval process can be easily predicted. The experimental method is firstly used to establish the equivalent effect between the setting round process and the circle-oval process. The setting round process can be converted into the circle-oval process. There are two difficulties in the theoretical analysis for the circle-oval process: elastic-plastic bending problem of curved beam; statically indeterminate problem. A quantitative analytic method for the circle-oval process is presented on the basis of combination of the spring-back law of plane curved beam with the element dividing idea in finite element method. The ovality after unloading versus the relative reduction is plotted with analytical and experimental results respectively, which shows a fair agreement. Finally, the method of quantitative prediction of reduction for large pipe setting round is given based on the equivalent effect and the analytical results. Five pipes, which are needed to be set round, are used to carry out experiment so as to verify this method. The results of verification experiment indicates that, in the experimental range, the residual ovality are all under 0.35% after the once only setting round with the theoretical prediction reductions. It is much less than the 1% requirement of pipe standard. Applying the established theoretical analysis is able to correct the pipe ovality with sufficient accuracy, which provides theoretical direction to plant use. | ZHAO Jun ZHAN Peipei MA Rui ZHAI Ruixue | 2013 | Chinese Journal of Mechanical Engineering2013，26，4： | 4 |
| 2 | 直缝焊管预弯成形质量概率特性分析显示文摘在焊管制造过程中,由于存在材料性能参数等不确定因素,将直接影响直缝焊管的预弯成形质量。因此,为了研究材料性能的波动对焊管质量的影响,采用有限元法分析预弯成形过程,并通过实验验证计算结果的准确性。在此基础上,基于随机模型分析了预弯成形质量的概率分布和敏感性分析。 | 闫嘉昕 范利锋 云建斌 | 2015 | 机械科学与技术2015，34，12： | 3 |
| 3 | Multi-objective optimization of crimping of large-diameter welding pipe显示文摘Crimping is widely adopted in the production of large-diameter submerged-arc welding pipes. Traditionally, designers obtain the technical parameters for crimping from experience or by trial and error through experiments and the finite element(FE) method. However, it is difficult to achieve ideal crimping quality by these approaches. To resolve this issue, crimping parameter design was investigated by multi-objective optimization. Crimping was simulated using the FE code ABAQUS and the FE model was validated experimentally. A welding pipe made of X80 high-strength pipeline steel was considered as a target object and the optimization problem for its crimping was formulated as a mathematical model and crimping was optimized. A response surface method based on the radial basis function was used to construct a surrogate model; the genetic algorithm NSGA-II was adopted to search for Pareto solutions; grey relational analysis was used to determine the most satisfactory solution from the Pareto solutions. The obtained optimal design of parameters shows good agreement with the initial design and remarkably improves the crimping quality. Thus, the results provide an effective approach for improving crimping quality and reducing design times. | 范利锋 高颖 云建斌 李志鹏 | 2015 | Journal of Central South University2015，22，7： | 0 |
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