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法兰起皱、翘曲等失稳缺陷是影响薄壁封头精密旋压制造的重要因素。运用三维有限元软件MSC.MARC模拟大减薄率薄壁半球形封头扩径旋压过程,获得了薄壁半球形封头的壁厚及减薄率对薄壁半球形封头旋压失稳的影响规律。结果表明,壁厚越小、减薄率越大,薄壁半球形封头越容易产生法兰起皱、翘曲等失稳缺陷。提取仿真结果中的周向应力数据,分析了周向应力与法兰失稳之间的关系,得到最大周向压应力为法兰起皱失稳临界应力,并通过旋压实验进行了验证,从而为研究薄壁封头的稳定精密旋压提供理论参考。
Flanges such as buckling, warping and other instability defects are important factors that affect the precision spinning of thin-walled head. The three-dimensional finite element software MSC.MARC was used to simulate the large-diameter thin-walled hemispherical head. The thin-walled hemispherical head’s spin-press loss Stability of the law. The results show that the smaller the wall thickness, the greater the thinning rate, the thinner hemispherical head more prone to flange wrinkling, warping and other instability defects. The circumferential stress data in the simulation results are extracted and the relationship between the circumferential stress and the flange instability is analyzed. The maximum circumferential compressive stress is obtained as the critical stress of the flange wrinkling and destabilization, which is verified by the spinning experiment. Thus providing a theoretical reference for the study of the stable precision spinning of thin-walled head.