Observations on the Use of Computers in the Process Planning of Machined Components

Abstract

The possibility of further integration of CAD/CAM systems is dependent upon a better understanding of the process planning function. Existing computer aids to process planning tend to stress a variant approach which does not easily allow for process evolution and optimisation. The authors describe a new approach to the optimisation of multi-operation machining processes, which should allow the pursuit of generative planning methods at higher levels of the process planning function. In order to demonstrate such an approach, the problem of optimising cost in the removal of discrete volumetric elements will be reviewed, with particular reference to the milling process. The additional problems which arise in practical cases, where several intersecting volumes must be removed are discussed. This more realistic problem is then formulated in a manner which allows the application of a simple, effective heuristic to find good results.