| In this dissertation, an algorithm for developing and verifying process plans and generating NC programs from a model of part geometry is developed. The analysis is based on the concept of an enclosing object, which is defined as a convex solid that encloses the target part. In contrast to prior attempts at NC code generation, this approach allows the system to deal with multiple setups and arbitrary orientations.;An important aspect of any automatic programming system is the feasibility and correctness of the result generated. One of the major achievements of this work is a clearly defined machinability test which can also act as a filter for rejecting improper part designs. Once a part passes the machinability check, the validity of the system generated result, in our case, the NC code, is assured.;In this research, we also address the problems of raw material suitability and optimization of the machining directions with respect to minimizing the number of setups. To demonstrate that the approach is viable, a prototype system called ZENO was developed. This system processes parts designed on the solid modeler I-DEAS, checks their machinability, and generates NC code for producing them. Currently, ZENO can only plan for vise-held parts and support 3-axis milling. |
