航空铝合金隔框板件加工过程刚度建模及研究

Research on Modeling of Stiffness of Aeronautical Aluminum Alloy Frame Plate in Machining Process

对航空大型框类结构件加工过程的刚度变化进行了研究。对铝合金板材及航空铝合金隔框板件的刚度进行理论分析和建模,在等效刚度模型基础上结合有限元计算航空铝合金隔框板件的等效刚度。计算结果表明,航空铝合金隔框板件的等效刚度相比于原始铝合金板材刚度下降88.9%。为研究航空铝合金隔框板件加工过程刚度演变情况,分析了不同位置隔框和逐层加工情况下航空铝合金隔框板件刚度的变化规律。研究表明,铝合金隔框板件逐层去除厚度达到12 mm以后,刚度下降趋势减缓;选取5个不同位置隔框,分析其对刚度变化的影响程度,其中中间隔框对刚度降低影响最为显著。

The stiffness changes of aircraft monolithic components during machining process are studied.Firstly,the stiffness model of aluminum alloy plate and aeronautical aluminum alloy frame plate is analyzed and established.Then,the equivalent stiffness of frame plate is calculated based on the model combining with FEM.The results show that it is reduced by 85%compared with aluminum alloy plate.The evolution of frame plate stiffness in the machining process is studied.The machining condition is set on the layer by layer and frame by frame.The influence of the material removal mode and the frame position on the bending stiffness are studied.The results show that the decreasing trend of stiffness slows down when the thickness of aluminum alloy frame plate reaches 12 mm layer by layer.The intermediate frame has the most significant impact on the stiffness reduction.