Three-dimensional visualized process design system and its design method

The invention relates to a three-dimension visualization process design system and a design method thereof, belonging to the computer integrated manufacturing field. In the invention, a three-dimension model is built on the supporting platform of a design system CAD, and other models carry out process design by taking the CAD system as a support and the three-dimension model as a basis; the features of the three-dimension model are identified automatically or semi-automatically by a feature identification module; the determination of a processing chain, the design of a clamping scheme, and the selection of a cutter and a clamp are respectively finished according to the identified features by a processing method selecting and positioning scheme design module; the sequencing of the processing features is finished by process sequencing; the generation of an intermediate state model leads the process design to be imagery and visual; the calibration of tolerance is finished by a process dimension calculation modul