A contribution to the study on cold forging of steel helical gears / Uma contribuição ao estudo do forjamento a frio de engrenagens helicoidais
AUTOR(ES)
Daniel Villas Boas
DATA DE PUBLICAÇÃO
2009
RESUMO
The forging processes are classified in hot forging, warm forging, and cold forging, that usually provide products that need some further machining operations to achieve manufactured part specifications. Cold forging asks for a special attention when manufacturing complex geometry parts, because its limitation with the forgeability of the workpiece material, as the limitation of tooling strength under mechanical loads. In the tools, high stresses are present during all forming process, and therefore it is very important to reduce it, through a better performance of material flow. Lateral extrusion presents these characteristics and with the aid of the numerical simulation of the process, by Finites Element Method and Finite Volume Method, it is possible the manufacturing of near net shape asymmetric parts with complex geometry. These sources added to the large experience of a forging industry with strong presence in the segment of cold forging, allowed to design and develop a new process of cold forging helical gears by lateral extrusion. This work had as objectives all the development of the process, the design of the tools and all the analysis of the cold forging of helical gears. Results from the numerical and experimental analysis show that the new process proposed in this work is capableof manufacturing helical gears with overall quality near to that typical of the machining process from hot forged blanks commonly used in industry
ASSUNTO(S)
análise numérica numerical analysis forjamento metal forming conformação de metais metallurgy forming metalurgia computer simulation simulação por computador
