(1) The characteristics of plane parts are that the machined surface can be parallel to the horizontal plane, perpendicular to the horizontal plane, or at a fixed angle with the horizontal plane; At present, the vast majority of parts processed on CNC milling machines belong to plane parts. Plane parts are the simplest kind of parts in CNC milling processing. Generally, they can be processed only with two axis linkage or three axis linkage of three-axis CNC milling machines. In the process of machining, the machined surface is in surface contact with the cutter, and end mills or nose cutters can be used for rough and finish machining.
(2) Curved surface parts, the characteristic of curved surface parts is that the machining surface is a spatial surface. In the machining process, the machining surface and the milling cutter are always in point contact. Ball end milling cutter is often used for surface finishing.
