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김홍석(H. S. Kim),김낙현(N. H. Kim),이일환(I. H. Lee),최석탁(S. T. Choi),이영선(Y. S. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
The importance and application of helical gears as crucial parts of automobiles have been increased steadily owing to its higher power transferring performance with reduced geometrical limitations compared to spur gears. However, the traditional gear manufacturing methods such as hobbing and deburring require long processing time and expensive machines so that there have been intensive efforts trying to make gears by using forging process. Although forging processes for spur and bevel type gears have been developed as practical level, the manufacturing of helical gears has been still depended on traditional cutting process. Therefore, this paper seeks to develop a cold forging process for a helical gear with the helix angle of 18.4225° and the pitch diameter of 43.4571 ㎜. A cold extrusion process was applied due to the relatively small diameter of the target part and the material deforming behaviors according to die geometries were considered by using CAE analysis. Finally, extrusion experiments were conducted and it was found that the helical gear can be manufactured by the cold extrusion process.