毕设论文正文-张银帅毕设论文文-张银帅.docVIP

本科毕业设计（论文） 题 目： 学生姓名： 院 （系）： 材料科学与工程学院 专业班级： 材料 指导教师： 李兰云 完成时间： 201年月8日 Low-alloy steel semicircular head Numerical simulation of hot stamping Abstract: The head pressure is an important component of boiler and pressure vessel , which is widely used in electrical , chemical, oil , nuclear and other industries. With economic development , especially the huge growth in energy demand for electricity , power station boiler unit with a capacity of 100MW development to 1000MW, but also by the boiler drum pressure 3.82MPa development 27.56MPa. Head along the wall thickness and size tends to large-scale, at present, at home and abroad for large size thick hemispherical head are used for processing thermoforming . Long-term production practice , companies formed the empirical calculation methods for head forming process , but these methods there is a big error , not a good practice guide . In this paper, the numerical simulation method , the forming process simulation, the main process parameters affect the quality of the forming head analysis and optimization. This paper describes the status of domestic research at home and abroad for the numerical simulation of sheet metal forming research progress , as well as thermoforming thick head . Pointed out the significance of the numerical simulation of hot forming thick head . ????By finite element simulation method, the main process parameters affect the quality thermoformed head were studied using range analysis methods to analyze the influence of different process parameters on the head . Method by analysis of variance were evaluated for significant impact of various factors. Within the range of the selected parameter , the most significant influence of friction . Keywords boiler head ; numerical simulation ; constitutive equation ; temperature thermal compression ; process parameters 目录 第1章 绪论 1