The deviation of high precision mechanical parts processing mainly comes from CNC lathes, special tools, raw materials and their human errors; in order to facilitate the application of statistical standard tolerances, the part deviation normal distribution monitor is used to predict the deviation trend and pattern when batch processing mechanical parts production parts.
It is well known that with the increase in precision of machining of high-precision mechanical parts, the production costs and difficulty factors increase; after statistical analysis of batch mechanical parts machining, the purpose of dimensional tolerances is to ensure the application of the entire equipment and product pipeline. Under the specified preconditions, if the deviation of the part obeys normal distribution, the tolerance level can be moderately liberalized after full consideration of the process performance of production and processing, so that the production of batch mechanical parts has good rationality.
All adjustable measurement point values in the whole process of precision parts machining vary from person to person, and the specification, appearance and surface of the part can rarely exceed the ideal value, so it is necessary to limit the error to a certain range to dimensional tolerances. If eigenvalues independently and identically distributed under any criterion were used for probability statistics, it would be very easy to machine high precision parts in batch machining of mechanical parts.
The deviation of the part is mainly influenced by the random factors of the production and processing system software, so that the result will cause the specific specifications of the machined high precision mechanical parts will be relatively idealized with an error that is close to the normal distribution; the numerical idealized value of the specific specification, so that the statistical analysis of the standard tolerance will be applied to determine the dimensional tolerance of the part. So how to define the dimensional tolerance boundaries for batch machining of mechanical parts? On the one hand, it is necessary to ensure its functionality, and on the other hand to decenter the marks that appear in the production process, which in turn will lead to a more refined economic development.