摘要
研究国产7050铝合金航空薄壁零件车削加工的变形预测,建立能够准确预测车削变形的有限元模型,对保证航空薄壁零件的加工精度与尺寸稳定性,提高飞机的结构强度和可靠性具有重要意义。采用仿真结合实验论证的方法,研究国产7050铝合金初始残余应力与车削残余应力耦合作用对薄壁承力框加工变形的影响规律。根据航空薄壁承力框加工工艺,采用生死单元法建立承力框车削变形仿真模型,通过盲孔法及车削实验,分别获得承力框毛坯初始残余应力场及车削表层残余应力;基于车削变形仿真模型,预测初始残余应力场及车削残余应力耦合作用下的承力框加工变形,并进行实验验证。结果表明:承力框变形仿真预测模型的误差小于15%。
Researching the deformation prediction of domestic 7050 aluminum alloy aviation thin-walled parts dur⁃ing turning processing and establishing an accurate finite element model for predicting turning deformation are of great significance for ensuring the machining precision and dimensional stability of aviation thin-walled parts,as well as improving the structural strength and reliability of aircraft.This thesis employs simulation and experimental demonstration methods to study the influence of the coupling effect between the initial residual stress of domestic 7050 aluminum alloy and the turning residual stress on the deformation of thin-walled bearing frames during pro⁃cessing.Firstly,based on the machining process of aviation thin-walled bearing frames,a turning deformation sim⁃ulation model of the bearing frame is established using the birth and death element method.Next,the initial residual stress field of the bearing frame blank and the turning surface residual stress are obtained through the blind hole method and turning experiments,respectively.Finally,based on the turning deformation simulation model,the de⁃formation of the bearing frame under the coupling effect of the initial residual stress field and turning residual stress is predicted and experimentally verified.The results show that the error of the bearing frame deformation simulation prediction model is less than 15%.
作者
马秀伟
胡越
姚雯莉
蒋睿嵩
MA Xiuwei;HU Yue;YAO Wenli;JIANG Ruisong(Shanghai Institute of Aerospace Systems Engineering,Shanghai Academy of Spaceflight Technology,Shanghai 201109,China;School of Aeronautics and Astronautics,Sichuan University,Chengdu 610065,China;School of Mechanical Engineering,Sichuan University,Chengdu 610065,China)
出处
《航空工程进展》
2025年第1期108-116,共9页
Advances in Aeronautical Science and Engineering
基金
国家科技重大专项(J2019-Ⅶ-0013-0153)
四川省科技计划资助(2021ZDZX0001,2021ZDZX0002)。
关键词
国产7050铝合金
航空薄壁件
加工变形
残余应力
车削
domestic 7050 aluminum alloy
aviation thin-walled parts
processing deformation
residual stress
turning
