Abstract: To improve the programming efficiency for the side corner features of aircraft structural parts,a primary element-based method for automatic recognition of side corner features and automatic construction of corner machining cells were proposed.Based on the geometric characteristics of common side corner structures and the CNC machining process of side corner features,terms such as primary element,side R,bottom R,operating element and machining cell were given.On the basis of considering the characteristics of geometric type,geometric attributes and machinability,the primary element identification method was proposed.A series of criteria were given to establish an automatic recognition method for side corner features.An automatic construction algorithm for side corner machining cells was proposed,and the algorithm was verified with examples.The proposed method had been applied to the corner machining programming of many types of aircraft structural parts,which greatly reduced the workload of human-computer interaction programming,shortened the programming time by more than 90%,and significantly improved the efficiency of corner feature programming.

Key words: numerical control machining programming, side corner feature, feature machining, machining cell, aircraft structural parts

摘要： 为提高飞机结构件转角特征编程效率,针对飞机整体结构件转角特征多、人机交互编程时间长的问题,提出基于主元的转角特征自动识别与转角加工单元自动构造方法。首先,结合常见转角结构几何特点及转角特征的数控加工工艺,引入主元、侧R、底R、操作元、加工单元等术语定义;然后,在综合几何类型、几何属性及可加工性等特性的基础上,提出和建立主元识别方法,并给出一系列准则,建立转角特征自动识别方法;最后,提出转角加工单元自动构造算法,并给出了实例和验证结果。所提出方法已应用于多个型号飞机结构件的转角加工编程,大大减少了人机交互编程工作量,缩短编程时间90%以上,显著提高了转角特征编程效率。

关键词: 数控加工编程, 转角特征, 特征加工, 加工单元, 飞机结构件