The machining factory emphasizes that the machining should meet certain precision, which means that the main parameters of the actual geometry of the steel parts after machining are consistent with the idealized values required by the part drawings. And the inconsistent level among them is called production and processing deviation.
The production and processing precision of the machining plant includes three levels: one is the specification precision, which limits the specification deviation between the two standards of the production and processing surface layer to not exceed the necessary scope; On the other hand, the geometric shape precision limits the macroeconomic geometric shape deviation of the production and processing surface, such as roundness, cylindricity, parallelism and straightness.
On the other hand, it is the precision of mutual parts, which limits the deviation of mutual parts between the standards of the surface produced and processed by the machining plant, such as the axial degree, flatness and parallelism. The precision of production and processing is the conformity between the actual specifications, shapes, positions and main parameters of several geometric figures on the surface of parts and components after production and processing and the main parameters of idealized geometric figures specified in the engineering drawings.
The main parameters of the idealized geometric figure, in terms of specifications, mean specifications; For the surface geometry, it refers to circles, cylinders, plans, spheres and parallel lines; For the mutual parts in the middle of the surface layer, it means parallel plane, vertical, coaxial output, symmetry, etc.
The deviation between the main parameters of the geometric figure and the main parameters of the idealized geometric figure of the parts produced by the machining plant is called the production and processing deviation. Production and processing precision and production and processing deviation are professional terms for commenting on the main parameters of the surface geometry of production and processing. The precision of production and processing is considered by the tolerance grade. The smaller the grade value, the higher the precision; The production and processing deviation is expressed by the standard value. The larger the standard value, the larger the deviation.
