椭圆窝自动化加工技术

Automatic drilling technology of oval hole

为解决椭圆窝自动化加工的工艺难题,提高整体式机翼装配的可靠性,在深入分析椭圆窝形状特点和加工原理的基础上,推导出了椭圆窝摆动中心公式,确定了锪窝刀具与摆动中心的相对位置关系。根据椭圆窝成形原理,提出了椭圆窝执行器各部件相对角度偏差要求并进行了标定。利用标定过的椭圆窝执行器对椭圆窝窝形参数的理论计算结果进行试验验证和调整,得出了窝形偏差的基本形式和调整方法。使用调整后的参数在铝合金材料上加工NAS6型椭圆窝,制出的椭圆窝长短径长度误差在0.05mm以内,椭圆螺母与工件表面的高度偏差在0.02mm以内,窝形满足机翼装配要求,实现了椭圆窝的自动化加工。

In order to solve the automatic drilling technique problem for the oval hole and enhance the reliability of the integrated wing assembly, on the basis of deeply analyzing the shape feature and processing principle of oval hole, the formula of swing center is deduced to determine the relative position between the countersink and swing center. According to the forming principle of oval hole, some requirements about the relative angular deviation of the end-effector components are put forward and the calibration task is conducted. The theoretical computing results of the shape parameters of oval hole are verified and adjusted by experiments using the calibrated end-effector. The basic forms of the shape deviation and the related adjusting methods are summarized. The adjusted parameters are used to drill NAS6 oval hole on aluminum, The results had the precision of 0.05 mm on the long and short diameters, 0.02 mm on the height deviation between the nut and the work-piece which satisfied the aircraft wing assembly requirements. The automatic drilling of oval hole is realized.