A cavity is a common structure in an aircraft structural and mold design. It is usually processed by a robot or computer numerical control (CNC) milling.^1–3 Aircraft structural parts are usually large in size and multi-cavity (the overall size can reach 4000 mm × 2000 mm); in this instance, cavities tend to be far apart from each other. In addition, the robot tool path planning of multi-cavity parts must consider each cavity’s profile and its spatial position relationship, keeping the machining mode unchanged and minimizing the number of tool changes required.^4,5

中文翻译：

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基于混合特征简化的复杂零件多型腔加工刀具路径优化方法

型腔是飞机结构和模具设计中的常见结构。通常由机器人或计算机数控（CNC）铣削加工。^1~3飞机结构件通常尺寸较大、多型腔（整体尺寸可达4000mm×2000mm）；在这种情况下，空腔往往彼此相距较远。此外，多型腔零件的机器人刀具路径规划必须考虑每个型腔的轮廓及其空间位置关系，保持加工模式不变，并最大限度地减少所需的换刀次数。^4,5