(1) The principle of rough first and then refined. When performing CNC machining, when dividing processes according to factors such as machining accuracy, rigidity and deformation of the parts, the processes should be divided according to the principle of separating rough and finishing, that is, semi-finishing and finishing are performed after all roughing is completed.
(2) The principle of near first and far away, face first before hole. According to the distance between the processing part and the tool setting point, under normal circumstances, the part close to the tool setting point is processed first, and the part far away from the tool setting point is processed later in order to shorten the tool movement distance and reduce the idle travel time.
(3) The principle of intersecting inside and outside first. For parts that have both inner surface (inner shape, inner cavity) and outer surface to be processed, when arranging the processing sequence, usually arrange the inner surface to be processed first, and then the outer surface. The inner and outer surfaces should be roughed first, and then Finishing of the inner and outer surfaces.
(4) The principle of the minimum number of tool calls. In CNC machining, in order to reduce the number of tool changes and reduce the idle time, the processes and steps should be divided according to the tools used. The parts can be machined according to the method of tool concentration process.
(5) The principle of the shortest path of the knife. On the premise of ensuring the quality of processing, making the processing program have the shortest path of the tool, not only can save processing time, but also reduce some unnecessary tool wear and other consumption.