【作者】 刘丽敏；

【导师】 谢谈； 钟志平；

【作者基本信息】 机械科学研究总院 ， 材料加工工程， 2008， 硕士

【摘要】 目前,在我国石油、天然气长输管道的建设中,采用大口径、高钢级管件产品已成为管道工程高压化发展的一个重要趋势,本课题就是针对我国重点工程—西气东输二期管线建设中的大口径高钢级管件成形工艺进行有限元数值模拟与实验研究。本文研究对象为X80钢级φ508mm和φ1219mm的等径三通产品,采用DEFORM-3D三维有限元数值模拟软件,对等径三通的成形规律进行了系统的研究,主要研究工作如下:1、通过实验测定了X80管线钢在不同温度和应变速率下的流动应力应变关系,为数值模拟中材料模型的建立提供了必要的数据。2、对φ508等径三通的成形过程进行有限元模拟分析。研究了不同工艺参数及模具参数条件下管件的成形规律,根据数值模拟分析的结果,获取了合理的成形工艺方案及参数。3、对φ508等径三通的成形工艺进行了实验验证,通过实验研究了管件成形规律,并与数值模拟结果进行了对比分析。分析表明:数值模拟结果与实验结果是一致的。4、通过对φ1219等径三通产品进行有限元模拟分析,总结出一条适合大口径高钢级管件产品生产的工艺路线及方案。通过本文的研究缩短了项目开发周期,节省了模具开发费用,降低了研发成本,其研究结果对于其它系列的管件成形也具有一定的指导意义。更多还原

【Abstract】 It is an important development trends to pressurization of large diameter high grade steel piping in the construction of long distance oil and natural gas transportation piping. This project is mainly applied for numerical simulation of finite element and experimental study on the forming process of large diameter high grade steel fittings of the second line of E-W Piping Line which is a key project in China. The study object of this paper isΦ508mm andΦ1219mm equal diameter tee with X80 piping steel. The forming process of equal diameter tee is systematically studied by means of DEF0RM-3D software. The main research work is as follows:1. Flow stress-strain is determined on X80 piping steel under different temperature and strain rate and necessary date is provided for the foundation of material model of numerical simulation.2. FEM Simulation is applied to the forming process ofΦ508mm equal diameter tee. Fitting forming is studied for different process parameters and mold parameters condition. Based on the results of numerical simulation, reasonable forming process and parameters are obtained.3. Forming process ofΦ508mm equal diameter tee is verified by experiment. It is indicated that the result of numerical simulation is similar to experiment.4. FEM Simulation is applied to the analysis of the forming process ofΦ1219mm equal diameter tee. The forming technology for the production of large diameter high grade steel fittings is put forward.The project development period is reduced due to the research work described in this paper, mold cost is saved and research cost is reduced. The research result is of theoretical significance and guiding roles in some extent for other series of fitting products.更多还原