多機能工作機械における複雑工作物形状に対する切削加工の効率化に関する研究

摘要

金属積層造形による付加加工（AM：additive manufacturing)技術の発展により，従来の機械加工の機能に加えてAM機能を具備した多機能な工作機械が登場している.切削加工とAMの両機能を組み合わせることで複雑形状の造形が可能になり，除去体積量の削減により加工効率の向上も期待される.しかし，金属積層により造形された工作物は形状が予測困難であり，想定していた形状との差異により切削加工時に機械と工作物間で想定外の干渉が生じる恐れがある.また，実際の工作物形状に対して図1に示すような不適切な工具経路を使用することで，加工効率が低下する可能性もある.%Metal additive manufacturing (AM) attracts a great deal of attention from manufacturing industries. Thus, a multi-functional machine tool that has not only machining function but also AM function is recently developed to realize high flexibility and productivity. However, it is difficult to expect and control workpiece shapes created by AM. These workpiece shapes are slightly different from the 3D model assumed in advance. The differences may induce unexpected collisions on a multi-functional machine tool. Additionally, machining productivity may decrease when NC program is generated with an original 3D model which is different from the actual workpiece shape. Therefore, this study aims at realizing high efficient machining of complicated workpiece shapes corresponding to the actual workpiece shape as created by AM. Key Words: Complicated workpiece shape, Multifunctional machine tool, CAM, On-machine measurement, Structure from motion