飞机蒙皮镜像加工变形迭代预测方法

Iterative Prediction Method for Deformation of Aircraft Skin in Mirror Machining

飞机蒙皮尺寸大、壁厚小,易发生加工变形,并且切削力与加工变形之间存在着复杂的耦合关系,普通的无迭代加工变形预测方法难以实现较好的预测效果。针对飞机蒙皮镜像加工变形现象,在建立镜像铣定制刀具切削力模型的基础上,提出一种加工变形迭代预测方法,该方法较好地解决了切削力与加工变形之间的复杂耦合关系问题,并通过仿真和试验证明了该方法的有效性。相对普通无迭代预测方法,该方法预测加工变形量的变化趋势和变化幅值更符合实际蒙皮镜像加工,加工变形仿真预测值与实际加工变形的差值更稳定,预测误差更小,可以更准确有效地预测出蒙皮镜像加工变形量。

Aircraft skin has large size and thin wall thickness,which is prone to machining deformation,and there is a complex coupling relationship between cutting force and machining deformation,so it is difficult to achieve good prediction effect by ordinary non iterative machining deformation prediction method.Aiming at the deformation phenomenon of aircraft skin mirror machining,based on the establishment of the cutting force model of customized tool for mirror milling,an iterative prediction method of machining deformation was proposed.The problem of complex coupling between cutting force and machining deformation can be solved by the method,and the effectiveness of the method was proved by simulation and experiment.Compared with the ordinary non iterative method,the method can predict the deformation trend and amplitude more in line with the actual aircraft skin mirror machining,the difference between the simulation predicted value and the actual machining deformation is more stable,the prediction error is smaller,and it can predict the deformation of the skin mirror machining more accurately and effectively.