Machining accuracy refers to the degree to which the actual geometric parameters (size, shape and position) of the part after machining are in line with the ideal geometric parameters. The difference between them is called machining error. The size of the machining error reflects the level of machining accuracy. The larger the error, the lower the machining accuracy, and the smaller the error, the higher the machining accuracy.
Machining accuracy includes three aspects:
1. Dimensional accuracy refers to the degree of conformity between the actual size of the processed part and the center of the tolerance zone of the part size;
2. Shape accuracy refers to the degree of conformity between the actual geometric shape of the surface of the processed part and the ideal geometric shape;
3. Position accuracy refers to the actual position and ideal between the relevant surfaces of the parts after processing.
Due to the influence of the processing factors, the size, shape and surface position of a batch of parts processed under the same conditions for accurate and complete product processing methods and production conditions will not be completely consistent. There is always a certain machining error. At the same time, from the premise of the tolerance range of full work requirements, a reasonable economy should be adopted to improve the productivity and economy of machining.