Automatic generation of process drawing for shaft parts in CAPP system

LI Juan， WANG Qing-ming
（School of Mechanical and Power Engineering， East China University of Science and Technology，
Shanghai 200237， China）

Abstract： Process drawing is the graphic expression of process design results. The low automation efficiency in process drawing generation is one of the main bottlenecks in computer aided process planning（CAPP） system. Aiming at realizing the automatic identification，editing and operation of each element by computer，by comprehensive utilizing the AutoLISP provided by AutoCAD and the data base technique，a new approach was proposed for producing the process drawing of shaft parts automatically. In the process of parametric drawing part sketch，store the geometry feature information through renaming the graphic elements. By coding the parts processing information，and modifying the characteristics in reverse order，the automatic generation of process drawing for shaft parts was realized. The results indicate that the process drawings generated by computer could accurately reflect the shape and size changes of the parts from blank to product in their manufacturing process. It also has a certain reference value to other kinds of parts.
Key words： automatic generation of process drawing； shaft parts； computer aided process planning（CAPP）； AutoLISP