The Research On Cold Precision Rotary Forging Process Of Common Bevel Gear And Its CAD/CAPP System

In this thesis, the basic aspects about forming process and mould for cold precision rotary forging of common bevel gear are studied with method of theory and experiment. The rules and numerical relations of dimensional precision relaying among common bevel gear part, die cavity and tool electrode are established. Meanwhile, the design and calculation methods for process parameters, mould, common bevel gear forging and preform and tool electrode are established. Based on the software platform of Pro/ENGINEER 20001, the design system (GearCAPP) consisted of CAPP and CAD, which are used for forming process and mould design for cold precision rotary forging of common bevel gear, are studied and developed.According to design route of the forming process of cold precision rotary forging of common bevel gear, this design system GearCAPP can be divided into 4 modules: the module of the information inputting of common bevel gear part, the module of design the forging, the module of the process parameters design, the module of mould design.In GearCAPP, the geometry model of common bevel gear part can be created in Pro/ENGINEER according to the information from the module of the information inputting; then, the process parameters can be calculated or determined based on geometry model and CAPP functions; finally, geometry model of forging, tool electrode and mould can be constructed, and the technology documents for production can be created as well.The research is based on the project for cold precision rotary forging of CITROEN car's gear. GearCAPP is applied to the design of CITROEN car's planetary gear successfully and the product accords with design standard.