사례기반추론을 이용한 협업기반 임펠러 가공공정계획

An impeller is composed of an axial hub and several blades attached along the hub. The hub and blades of an impeller are commonly machined in a 5-axis NC machine to obtain qualified surfaces. But, the impeller machining strategy or process plan can not be easily formalized due to the complex, overlapped and twisted shapes of impeller blades. Skillful machining process planners may generate appropriate machining strategies based on their experiences and floor data. However, in practice most shop floor data for the impeller machining is not well-structured such that it does not effectively provide a process planner with information for producing machining strategies and process plans. This paper addresses the development of a case-based machining strategy support system that employs CBR(case-based reasoning) to obtain the machining strategies of an impeller by using the existing machining strategies of the shop floor. This system generates impeller machining strategies through a stepwise reasoning process considering the similarities between the blade shapes and machining regions. It can provide a process planner with machining strategies such as tool specifications, machining area partitioning, and machining parameters considering machining history.