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http://dx.doi.org/10.5228/KSTP.2011.20.7.485

A Study on Development of Cold Forward Extrusion Process for Helical Gears of Automotive Transmissions  

Kim, H.S. (대구대학교 기계.자동차공학부)
Lee, I.H. ((주)티에이케이)
Choi, S.T. ((주)티에이케이)
Lee, Y.S. (한국기계연구원 부설 재료연구소)
Publication Information
Transactions of Materials Processing / v.20, no.7, 2011 , pp. 485-490 More about this Journal
Abstract
The application of helical gears in crucial parts of automotive transmissions has been steadily increasing due to their higher power transfer performance compared to spur gears. However, the traditional gear manufacturing methods such as hobbing and deburring require large cycle times with expensive production lines so that there have been intensive efforts trying to manufacture gears via forging processes. Although forging processes for spur and bevel type gears have been developed on the practical level, the manufacturing of helical gears is still dependent on the traditional cutting process. Therefore, this paper seeks to develop a cold forward extrusion process for the helical gear with the pitch diameter of 43.5mm and a helix angle of $18.4^{\circ}$. A forward extrusion process was used due to the relatively small diameter of the target geometry. The material deforming behavior influenced by the die geometry was examined by using CAE analysis. Finally, it was found that the helical gear manufactured by the developed extrusion process satisfied the dimensional accuracy and mechanical characteristics for automotive transmissions.
Keywords
Helical Gear; Automotive Transmission; Cold Forging; Forward Extrusion; CAE Analysis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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