Part surface accuracy and roughness requirements are relatively high, often impossible to complete in a process, and divided into several stages to process.
Cnc Shouban model production process of the four processing stages
(1) roughing stage. Roughing is the removal of most of the surface of the majority of processing margins, so that rough shape and size close to the finished product. This stage is characterized by the use of high-power machine tools, the choice of a larger cutting with children, as much as possible to improve productivity and reduce tool wear.
(2) semi-finishing stage. Semi-finishing is the process of finishing the secondary surface and preparing for the main surface finish.
(3) finishing stage. Finishing is to ensure that the main surface to meet the requirements of the processing pattern.
(4) finishing process. Finishing is the surface roughness and high precision machining requirements of the surface, need to be finishing. This stage can not generally be used to improve part position accuracy.
It should be noted that the processing stage of the division is the whole process of parts, not a surface processing or a process to determine the nature of the process. At the same time in specific applications, it can not be absolute, for some heavy parts or small margin, the accuracy of the parts is not high, you can complete the surface after a fixture rough finishing.