(1) Rough machining stage. Most of the machining allowance of each machining surface shall be cut off and the precision datum shall be machined. The first consideration is to improve the productivity as much as possible.
(2) Semi finishing stage. Remove the possible defects after rough machining, prepare for the finish machining of the surface, require to reach a certain machining accuracy, ensure the appropriate finishing allowance, and complete the processing of the secondary surface together.
(3) Finishing stage. In this stage, large cutting speed, small feed rate and cutting depth are selected to cut off the finishing allowance left by the previous process, so as to make the part surface meet the technical requirements of the drawing.
(4) Finishing stage. It is mainly used to reduce the surface roughness value or strengthen the surface processing. It is mainly used for the surface processing with high surface roughness requirements (RA ≤ 0.32 μ m).
(5) Super fine machining stage. The machining accuracy is 0.1-0.01 μ m, and the surface roughness Ra ≤ 0.001 μ M. The primary processing methods are: fine cutting, fine mirror grinding, fine grinding and polishing.
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