Development of high precision and strength sintered ferrous alloy gear by rolling -3rd report improvement of tooth root bending fatigue strength of sintered ferrous alloy gear by modified tool

Hideshi Miura, Fujio Tsumori, Ternie Takemasu, Kosuke Komoto, Shota Hamamoto, Shigeru Unami

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

Surface finish rolling experiments were carried out using P/M spur gears of 0.6Mo-0.2Mn pre-alloyed sintered steel and of 0.8Mo-0.2Mn partially alloyed sintered steel with the density of 7.10 Mg/m3. A CNC form rolling machine of axis intersection type was employed, and a modified screw-shaped rolling tool was prepared: the modified concave tooth profile optimized by numerical tooth profile analysis for simultaneous rolling of tooth and fillet surface. Then, porosity distributions in the surface layer of rolled gear teeth were determined and the effects of the amount of tool radial feed Ao on the selective surface densification behaviors were evaluated. Besides, single tooth bending fatigue test was conducted. Gears with good tooth profiles were obtained by using the modified tools. As a result, the porosities in both the tooth flank and the fillet at the root were reduced to the target level at R 0 = 600μn in simultaneous rolling process. Furthermore, the single tooth bending fatigue durability was much improved to about 60% of the case hardened wrought steel gears of SCM415.

本文言語英語
ページ(範囲)435-441
ページ数7
ジャーナルFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
57
6
DOI
出版ステータス出版済み - 6月 2010

!!!All Science Journal Classification (ASJC) codes

  • 機械工学
  • 産業および生産工学
  • 金属および合金
  • 材料化学

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