Precision parts processing is not possible to complete all the surface processing content in one process, the entire process of precision parts processing can be divided into the following stages.
1, roughing stage. Cut off most of the machining allowance of each processing surface, and processing the precision benchmark, the main consideration is to increase productivity as much as possible.
2、Semi-finishing stage. Cut off the defects that may arise after rough machining, and prepare for the finishing of the surface, requiring a certain machining accuracy and ensuring the appropriate finishing margin, while completing the machining of the secondary surface.
3、Finishing stage. In this stage, the use of large cutting speed, small feed and depth of cut, remove the finishing margin left by the previous process, so that the surface of the part to meet the technical requirements of the drawing.
4、Light finishing stage. Mainly used to reduce the surface roughness value or strengthen the processing surface, mainly for surface roughness requirements are very high (ra ≤ 0.32μm) surface processing.
5、Ultra-precision machining stage. Machining accuracy in 0.1-0.01μm, surface roughness value ra ≤ 0.001μm processing stage. The main processing methods are: precision cutting, fine mirror grinding, precision grinding and polishing, etc.
