When dividing CNC processes, the structure and manufacturability of the parts, the function of the machine tool of the CNC machining center, the content of the CNC machining of the parts, the number of installations and the production organization of the unit are flexible. It is also recommended to adopt the principle of process concentration or the principle of process dispersion, which should be determined according to the actual situation, but it must be reasonable. The division of the process can generally be carried out according to the following methods:
1. Tool centralized sorting method.
This method is to divide the process according to the tool used, and use the same tool to finish all the parts that can be completed on the part. In order to reduce the tool change time, compress the lost motion time, and reduce unnecessary positioning errors, the parts can be processed according to the tool concentration process, that is, in one clamping, as far as possible, use one tool to process the possible parts used, and then Change another knife to process other parts. This reduces the number of tool changes, compresses the lost motion time, and reduces unnecessary positioning errors.
2. Sorting method by processing parts.
The shape of each part is different, and the technical requirements of each surface are also different. Therefore, when processing, the positioning method is different, so the process can be divided according to the different positioning methods.
For parts with a lot of cnc machining content, the processed part can be divided into several parts according to its structural characteristics, such as internal shape, shape, curved surface or plane. Generally, the plane and the positioning surface are processed first, and then the hole; the simple geometry is processed first, and then the complex geometry is processed; the part with lower precision is processed first, and the part with higher precision is processed.
3. Separate method by roughing and finishing.
When dividing the process according to the processing accuracy, stiffness and deformation of the parts, the process can be divided according to the principle of separating rough and finishing, that is, roughing first and then finishing. At this time, different machine tools or different tools can be used for processing; For parts that are prone to machining deformation, due to the deformation that may occur after rough machining, it is necessary to perform shape correction, so in general, the rough and finishing operations must be separated.