Mo添加鉄系焼結合金歯車の歯元転造加工による表面緻密化および高強度化

Translated title of the contribution: Improvement of Surface Densification and Fatigue Strength by Tooth Root Rolling of Sintered Ferrous Alloy Gear Added Mo

宇波 繁, 合志 拓也, 工藤 健太郎, 津守 不二夫, 姜 賢求, 三浦 秀士

Research output: Contribution to journalArticlepeer-review

Abstract

Surface rolling were carried out using P/M spur gears of 0.6Mo-0.2C partially alloyed sintered steel with the density of 7.18 g/cm<SUP>3</SUP>. A CNC form rolling machine of axis intersection type was employed, and an unmodified screw-shaped rolling tool was prepared. Then, porosity distributions in the surface layer of rolled gear teeth root were measured and the effects of the surface rolling on the selective surface densification behaviors were evaluated. Moreover, to obtain higher fatigue strength, reverse rolling was introduced to standard gears. As a result, the porosities in the tooth root were sufficiently reduced at 700 μm feed in rolling process. Furthermore, a profile shifted gear was prepared to increase the effect of surface rolling. After case hardening, the single tooth bending fatigue durability reached to about 83 % of the case hardened wrought steel gears of SCM415.
Translated title of the contributionImprovement of Surface Densification and Fatigue Strength by Tooth Root Rolling of Sintered Ferrous Alloy Gear Added Mo
Original languageJapanese
Pages (from-to)693-696
Number of pages4
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume58
Issue number11
DOIs
Publication statusPublished - Nov 15 2011

Fingerprint Dive into the research topics of 'Improvement of Surface Densification and Fatigue Strength by Tooth Root Rolling of Sintered Ferrous Alloy Gear Added Mo'. Together they form a unique fingerprint.

Cite this