The CAPP system for flashless die forging of gear blanks is described in this paper, which takes VBA as objected-oriented d eveloping tool, with AutoCAD2000 as the drawing platform.

The development method and the key technology of parameterized design system for flashless die forging drawings of gear blanks have been described.

The CAPP system for flashless forging of gear blanks is described in this paper, which takes VBA as objected-oriented development tool and AutoCAD2002 as drawing platform.

Based on AutoCAD ActiveX technology,the characteristic of object-oriented programming of VBA has been expounded,then some detailed applications of VBA in flashless die forging CAPP system for gear blanks have been illustrated.

Using the feature technique,a set of flashless die forging CAPP system for gear blanks is developed.

The entire structure of the CAPP system for flashless forging of gear blanks is widely studied from the input of the information, to the establishment of the technologic databases and the development of the user interfaces.

After analyzes the influence of automobile cemented gear rough,which is adopted the method of utilizing the residual forging heat for normalizing and isothermal normalizing,on it's structure,hardness,and distortion during cementation and quenching,the feasibility and necessity of the way of utilixing the residual forging heat for isothermal normalizing as pre-heat treatment are determined.