Importance Of CNC Machining Sequence

There are often several surfaces to be processed on a CNC machined part. These surfaces not only have certain accuracy requirements, but also certain position requirements between the surfaces. In order to meet these precision requirements, the processing 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 datums for subsequent procedures in principle.

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

2. 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.

3. The surface 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".

4. Coarse datum positioning is required when processing fine datum planes. 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 scribing process should be arranged before the machining process in order to be a precise benchmark Processing provides alignment benchmarks.

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