Abstract
A new methodology to automate machining operation planning is proposed. A new machining operation plan is reconfigured from past case data or past machining operation data stored in the database. Machining information, e.g. cutting tool, cutting conditions, tool path pattern, is associated with a machining feature. A machining feature is recognized from the 3D CAD model of the finished shape. Sets of machining information are stored as the past case data with their 3D CAD models. In order to generate a new machining operation plan of a new product, machining features are recognized based on topological relationship of the 3D CAD model first. Then, each of machining feature is compared with machining features contained in 3D CAD models stored as the past case data quantitatively in terms of shape, size and material. Finally, the most similar machining feature is selected as the reference one. The machining information associated with the reference machining feature can be applied for each machining feature recognized in the new product. Finally, the NC program to perform a new machining operation is generated automatically. The usability and effectiveness of this proposed system to save time and effort of human operator was verified through a case study.
