多軸制御加工のための効率的荒加工用工具経路生成の研究

摘要

In recent years, 3-axis control machining is generally performed in roughing process. However, 3-axis control machining is not efficient in case of roughing complicated shapes, i. e.. parts with overhanging shape, because it requires to reset the workpiece. To solve this problem, 5-axis control machining has been developed. However, there has been no roughing procedure in 5-axis control machining. The study deals with roughing by 3+2-axis control machining, which performes 3 translational axis machining after determining a suitable tool axis vector by 2 rotational axis movement. For 3 + 2-axis control machining, the determination of tool axis vectors and tool diameters largely affects the rough machining time. The study proposes a method of determining the optimal tool axis vectors and selecting the tool diameters for efficient roughing. At first, the method searches candidate of tool axis vectors after calculating machinable area in each tool axis vector, applying the multi-stage decision process. Then, the method determines the combination of tool axis vectors and tool diameters, using a peformance index. The effectiveness of the proposed method was demonstrated by the machining experiment of an impeller.%現在，製造業界において製品の消費者ニーズの多様化，ライフサイクルの短縮等により，製品の設計・開発・生産にかかる時間の短縮が望まれている．その一方で製品の形状に対する要求は複雑化，多様化する傾向が顕著である． このような背景から，高能率で高精度加工を実現するため．NC工作機械の多軸化が進んでいる．その代表例が五軸制御加工機である．