2000 年 66 巻 7 号 p. 1048-1052
The purpose of this research is to develop a CAD/CAM system based on Boundary-Map geometric model. Geometric model used in a current CAD/CAM system has been developed to be suitable for representing 3D shapes precisely. When these geometric models are applied to CAM system, some problems occasionally arise in an accuracy, an execution speed for collision check, machining error due to a small deformation caused by cutting force and heat and so on. Therefore a new geometric model named "Boundary-Map geometric model", which is suitable for CAM functions, has been proposed . This paper describes the data struc-ture of Boundary-Map geometric model and three functions, which are geometric generation, geometric modification and geomet-ric rendering, to use for the CAD system. Moreover, basic algorithms to generate cutter location data and collision check betweenn a tool and work piece have been newly proposed. From the result of machining tests by employing the proposed CAD/CAM system, it is confirmed that the Boundary-Map geometric model satisfies basic functions required to a common CAD/CAM system.