飞机机身-机翼接头精加工条件评价技术

 在飞机机身部件数字化对接装配过程中，为保证机身-机翼接头配合面与连接孔精加工的安全性，在加工前安排机身-机翼接头的在线三坐标测量工序。具体阐述了基于专用数控机床的机身-机翼接头测量方法，提出了被测孔与平面理想几何要素的稳健最小二乘拟合方法，并给出了基于被测孔、面拟合方位的机身-机翼接头可加工性评价模型。仿真结果表明：接头孔与平面的稳健拟合方法具有较高的精度和较强的抗粗差能力，机身-机翼接头的可加工性检验能揭示不合理的飞机机身、机翼位姿所带来的加工安全隐患，从而避免精加工过程破坏机身-机翼接头。

Finish Machining Condition Evaluation Technology for Aircraft Fuselage-wing Joints

To guarantee the finish machining security of fuselage-wing matching plane and joint hole during the numerical join assembly of aircraft fuselage subassemblies, an automated three-coordinate measurement procedure for fuselage-wing joints is suggested before formal machining. The corresponding measuring method based on special purpose computer numerical control (CNC) machine tool is illustrated. Then, a robust least square fitting algorithm for measured hole and plane is proposed, and a finish machining condition evaluation model for fuselage-wing joints is put forward based on these fitting results. Simulation results show that the robust least square fitting algorithm has good accuracy and strong anti-gross error ability, and besides, hidden troubles of joint finish machining process caused by improper posture of fuselage or wing can be found out, thus momentous damage of fuselage-wing joints can be avoided.