Machining 5 steps:
1. Rough machining
The main consideration is to improve productivity. Most of the machining allowance of each machining surface is cut off, and a precision datum is machined.
2. Semi finishing
It is mainly to remove the possible defects after rough machining and finish the machining of the secondary surface at the same time. A certain machining accuracy must be achieved in order to prepare for the finishing stage and ensure appropriate finishing allowance.
3. Finishing
In the finishing stage, large cutting speed, small feed rate and cutting depth are mainly used to cut off the machining allowance left by semi finishing, so that the surface of precision machinery parts can meet the technical requirements of the drawing.
4. Finishing
It is mainly used to reduce the surface roughness or strengthen the machined surface, and it is mainly used for surface processing with high surface roughness requirements.
5. Ultra precision machining
The machining accuracy of the workpiece is mainly 0.1-0.01 by precision cutting, precision mirror grinding, precision grinding and polishing μ m. Surface roughness Ra ≤ 0.001 μ m。