The division of CNC machining processes can generally be carried out in the following ways:
1. The method of tool concentration and sequencing is to divide the process according to the tool used and use the same tool to process all the parts that can be completed on the part. In other parts, they can finish with the second knife and the third. In this way, the number of tool changes can be reduced, the idle time can be compressed, and unnecessary positioning errors can be reduced.
2. Sorting method of processing parts For parts with a lot of processing content, the processing part can be divided into several parts according to its structural characteristics, such as inner shape, outer shape, curved surface or plane. Generally, the plane and positioning surface is processed first, and then the holes are processed; the simple geometric shapes are processed first, and then the complex geometric shapes are processed; the parts with lower precision are processed first, and then the parts with higher precision requirements are processed.
3. Rough and finish machining sequence method For parts that are prone to machining deformation, shape correction is required due to possible deformation after rough machining. Therefore, generally speaking, the processes for rough and finished machining must be separated.
To sum up, when dividing the process, it must be flexibly controlled according to the structure and manufacturability of the parts, the function of the machine tool, the amount of CNC machining content of the parts, the number of installations and the production organization status of the unit. In addition, it is recommended to adopt the principle of process concentration or the principle of process dispersion, which should be determined according to the actual situation, but must strive to be reasonable.