The quality of precision part processing is expressed by the precision of machining

The quality of precision part processing is expressed by the precision of machining

First, the exchangeability of parts
The introduction of precision parts processing equipment, the machine is long-term production and operation, some parts will inevitably wear, deform and scrap, and replace with new parts. These parts are called accessories or spare parts. Accessories or spare parts can be operated without being repaired or selected, and they are said to be interchangeable.

In order to complete the exchangeability, the dimensions and geometric forms of the parts must be made in the manufacture of the parts. The so-called generalization does not require that the scores be all the same (it is neither economical nor possible), as long as the dimensions and geometric forms of the parts are controlled within a promised boundary, so that the parts and the remaining parts have the same fusion. Converged features will do. This promised deviation line, that is, the shape of the servant.
　

Second, the quality of precision parts processing is expressed by the processing precision:
Geometric form accuracy
Geometric form accuracy refers to the exact level of geometry such as the surface or axis of the part, such as whether the line is straight, whether the surface is flat, and whether the positive sections on the cylinder are round or not. The boundary of the promise change is represented by “shape and service”, and the smaller the shape of the service, the higher the form accuracy.
  2. Size accuracy
Precision parts processing field analysis, dimensional accuracy refers to the accurate level of the dimensions of the parts after processing, expressed in "size servitude". When the dimensions of the parts are the same, the higher the accuracy, the smaller the service number.
3. Position accuracy
    According to the introduction of precision parts processing field, positional accuracy refers to the accurate level of mutual position between the surfaces of the components, such as whether the two planes are parallel, vertical, and whether the two axes are coaxial, etc., which is represented by "positional service".
The servitude of the above forms and positions is referred to as “formation servitude”.