The machining plant emphasizes that machining must meet a certain degree of precision, which refers to the degree of consistency between the actual geometric parameters of the steel parts after machining and the ideal values required by the part drawings. The degree of inconsistency between them is called processing deviation.
The machining precision of the machining plant includes three aspects: on the one hand, the dimensional precision, which limits the dimensional deviation between the standard and standard of the machining surface within the required range; on the other hand, the geometric shape precision, which limits the macro-geometric shape deviation of the machining surface, such as roundness, cylindricality, parallelism and straightness.
Another aspect is the mutual position precision, which limits the mutual position deviation between the standard and standard of the machining surface of the machining plant, such as coaxiality, flatness and parallelism. Processing precision is the degree of consistency between the actual size, shape, position and other geometric parameters of the surface of the part after machining and the ideal geometric parameters specified in the engineering drawing.
Idealized geometric parameters, for size, refer to mean size; for surface geometry, refer to circles, cylinders, planes, spheres and parallel lines, etc.; for the mutual parts of the surface, refer to parallel planes, verticals, coaxial outputs, symmetry, etc.
The deviation between the actual geometric parameters of parts produced by a machining plant and the ideal geometric parameters is called processing deviation. Processing precision and processing deviation are both professional terms for evaluating the surface geometry parameters of the machining process. Processing precision is measured by tolerance grade. The smaller the grade value, the higher the precision; processing deviation is expressed by standard value. The larger the standard value, the greater the deviation.
