(1) Rough machining stage. Cutting off most of the machining allowance of each processing surface, and processing the precision benchmark, the main thinking is to increase the consumption rate as much as possible.
(2) The semi-finishing stage. Cut off the defects that may occur after rough machining, prepare for the surface finishing, request a certain machining accuracy, ensure the appropriate finishing allowance, and complete the processing of the secondary appearance.
(3) Finishing stage. At this stage, a large cutting speed, a small feed rate and a cutting depth are used to remove the finishing allowance left by the previous process, so that the appearance of the part can meet the technical requirements of the drawing.
(4) Finishing processing stage. It is mainly used to reduce the surface roughness value or strengthen the processing surface, and is mainly used for surface processing with high requirements for surface roughness (ra≤0.32 μm).
(5) Ultra-fine processing stage. The processing accuracy is 0.1-0.01μm, and the surface roughness value ra is less than or equal to 0.001μm. The main processing methods are: fine cutting, fine mirror grinding, fine grinding and polishing.
