When the machining quality of parts is high, it is often impossible to use one process to meet the requirements, but to use several processes to gradually reach the required machining quality. In order to ensure the quality of CNC machining parts and the correct use of equipment and manpower, the machining process of parts can be divided into four stages: rough machining, semi finishing, finishing and finishing.
The differentiation of CNC machining stage should be based on the quality requirements, structural characteristics and manufacturing program of parts, and should not be absolute. It is unnecessary to distinguish processing stages for equipment with low processing quality requirements, good equipment rigidity, high blank precision, small machining allowance and small production program. For heavy workpieces with good rigidity, due to clamping, transportation and time-consuming, all rough and finish machining are often completed under one clamping.
As for the workpiece without distinguishing the processing stage, in order to reduce the impact of various deformations on the processing quality during the rough processing, it is necessary to loosen and accelerate the organization after the rough processing, park the workpiece for a period of time, make the workpiece fully deformed, and then use a small accelerating force to accelerate from the beginning for finishing.
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