钛合金球形封头热冲压成形有限元分析  

Finite Element Analysis of Hot Stamping Forming of Titanium Alloy Spherical Head

作　　者：周三平[1] 牛少宏 ZHOU Sanping;NIU Shaohong(School of Mechanical Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2024年第6期108-113,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：陕西省重点研发计划项目(2022SF-233)。

摘　　要：针对钛合金球形封头热冲压过程中的局部减薄缺陷,利用有限元模拟平台DEFORM-3D对钛合金球形封头热冲压过程进行了有限元数值模拟,分析了不同出炉温度下等效应力应变随时间的演变过程、机理及产生减薄的因素等。结果表明:成形后封头的等效应力随温度的升高而降低,边缘处等效应力高出其余位置很多,边缘处与中心处之间位置的等效应力最低。等效应变按从中心到边缘的顺序依次经历由加速增大到恒定不变的转变过程,越靠近边缘的位置,转变时间越晚、恒定值越高,从中心到边缘处等效应变逐次增大。中心位置的减薄量最大,中心到边缘之间的位置减薄量次之,边缘处增厚;温度对中心部位的减薄量影响较大,1000℃时减薄量最小,对其余位置的减薄量影响不大。摩擦系数对厚度影响可以忽略。研究结果对提高钛合金球形封头热冲压成形质量有重要的指导意义。A finite element numerical simulation was conducted on the hot stamping process of titanium alloy spherical heads using the finite element simulation platform DEFORM-3D.The evolution process and mechanism of equivalent stress and strain over time at different initial temperatures,as well as the thinning process of spherical heads,were analyzed.The results show that the equivalent stress of the formed head decreases with the increase of initial temperature,and the equivalent stress at the edge is much higher than that at other positions.The equivalent stress at the middle position between the edge and the center is the lowest.The equivalent strain of the formed head changes from an accelerated increase to a constant value.The closer the position is to the edge,the later the transformation time and the higher the constant value of equivalent strain.The equivalent strain gradually increases from the center to the edge.The thickness reduction of spherical head at the center position is the greatest,gradually decreasing from the center to the edge,while the thickness of spherical head increase at the edge.The temperature has a significant impact on the thickness reduction in the central area,with the smallest thickness reduction at 1000℃and little effect on the thickness reduction in other positions.The effect of friction coefficient on thickness reduction can be ignored.The research results have important guiding significance for improving the quality of hot stamping forming of titanium alloy spherical heads.

关 键 词：球形封头 钛合金 热冲压 有限元分析 DEFORM-3D 

分 类 号：TG306[金属学及工艺—金属压力加工] TE97[石油与天然气工程—石油机械设备]