The process knowledge database is introduced

which uses typical part with machining features to create typical process. By creating the association between the typical part and new part

the difference between typical part and new part is analyzed

and process for the new part is derived. Thus the inferential system is simple

and the inferential results are believable

and the maintenance of typical process is more convenient. In addition

this process knowledge database also contains process parameters

tools

and other basic data

which can be used for building typical process

and be used by technicians as references to design process.