【作者】 叶明；

【导师】 高锦张； 于丰；

【作者基本信息】 东南大学 ， 材料工程（专业学位）， 2018， 硕士

【摘要】 在现代工业发展中,大型空心锻件的使用越来越频繁。例如在核电行业中,空心锻件应用于主管道锻件、核反应堆容器和蒸汽发生器等。随着空心锻件的工作环境的温度不断升高以及压力不断提升,对其综合机械性能提出了更高的要求。因此提出了大型圆柱锻件的深冲孔成形工艺。本文以DEFORM-3D为平台,建立了相关的有限元模型,对大型空心锻件的冲孔成形进行了数值模拟,获得极限冲孔尺寸范围,对实际生产过程具有重要的指导意义。本文以大型圆柱形锻件作为模拟研究对象,分别研究了圆柱锻件在高径比H/D在1.0~3.0时,直径为400mm~1600mm下的冲孔极限尺寸。在圆柱锻件最小冲孔极限尺寸研究中,发现在高径比一定时,最小冲孔极限尺寸与圆柱锻件直径的关系可拟合成参数方程。在圆柱锻件直径一定时,最小冲孔极限尺村与圆柱锻件高径比的关系也可以拟合成参数方程。利用参数化方程预测圆柱锻件的最小冲孔直径,与模拟实验结果基本一致。在圆柱锻件最大冲孔极限尺寸研究中,探究了圆柱锻件冲孔坯料外形变形量随着冲孔孔径比的变化规律,以及应力场和应变场的分布规律,提出合理的允许外形变形量的判据来确定的对应冲孔极限尺寸。本文的研究结果可以为大型圆柱锻件冲孔参数的制订提供分析依据,同时将研究结果绘制成表格,利用查表法快速制订工艺参数。更多还原

【Abstract】 In the development of modern industry,large hollow forgings are used more and more frequently.For example,in the nuclear power industry,hollow forgings are used in main pipeline forgings,nuclear reactor containers and steam generators.With the increasing of temperature and pressure in the working environment of hollow forgings,higher requirements are put forward for the comprehensive mechanical properties of hollow forgings.Therefore,the deep punching forming process of large cylindrical forgings is put forward.In this paper,based on DEFORM-3D platform,the relevant finite element model is established,and the numerical simulation of punching forming of large hollow forgings is carried out to obtain the limit punching size range,which has important guiding significance for the actual production process.In this paper,large cylindrical forgings are used as simulation objects.The punching limit size range of cylindrical forgings with the diameter of 400mm~1600mm is studied when the ratio of height to diameter is 1.0 / 3.0.In the study of the minimum punching limit size of cylindrical forgings,it is found that when the ratio of height to diameter is fixed,the relationship between the minimum punching limit size and the diameter of cylindrical forgings can be quasi synthesized into parametric equations.When the diameter of cylindrical forgings is fixed,the relation between the minimum punching limit and the ratio of height to diameter of cylindrical forgings can also be quasi synthesized into parametric equations.The minimum punching diameter of cylindrical forgings is predicted by parameterization equation,which is in good agreement with the experimental results.In the study of maximum punching limit size of cylindrical forgings,the variation law of blank shape deformation with punching aperture ratio is studied,and the distribution of stress field and strain field is analyzed.At the same time,a reasonable criterion of allowable shape deformation is proposed to determine the corresponding punching limit size.The research results in this paper can provide analysis basis for the formulation of punching parameters of large cylindrical forgings.At the same time,the research results can be drawn into a table,and the process parameters can be quickly determined by the method of look-up table.更多还原