How to arrange the process for CNC milling machine processing?

There are often several surfaces to be processed on a CNC machined part. These surfaces not only have certain accuracy requirements, but also have certain position requirements between the surfaces. In order to meet these precision requirements, the machining sequence of each surface of CNC machined parts cannot be arranged randomly, but must follow certain principles. This is that the selection and conversion of positioning datum determines the processing sequence, and the preparation of positioning datum for subsequent procedures in principle.

1. The surface used as a precision reference should be processed at the beginning of the CNC machining process, because it is used for positioning when processing other surfaces in the subsequent process. That is, "benchmark first, then others".

2. When machining a fine datum surface, rough datum positioning is required. In single piece, small batch production, or even batch production, for castings and forgings with complex shapes or large sizes, and blanks with large dimensional errors, the marking process should be arranged before the machining process in order to be a precise benchmark Processing provides alignment benchmarks.

3. After finishing the reference machining, rough machining, semi-finishing and finishing should be carried out on the main surfaces with higher precision requirements. Surfaces that require particularly high precision also need to be smoothed.

4. Before the important surface processing, the precision datum should be adjusted once to help ensure the processing accuracy of the important surface.

5. For processes that are prone to waste, finishing and finishing can be placed in the front, and some minor surface processing can be placed behind.