オーステンパ処理球状黒鉛鋳鉄(ADI)歯車の負荷能力に関する研究 : 微粒子ショットピーニングを施したADI歯車の歯面強さ(機械要素,潤滑,工作,生産管理など)

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In this paper, the load-carrying capacity, in particular, the surface durability of gear pairs with a combination of Austempered Ductile Iron (ADI) gear and hardened steel one is investigated using a power-circulating type gear testing machine. It is practical that a hardened steel such as case-carburized one is used for pinions to increase its bending strength and surface durability, and ADI is used for large gears to use its advantages such as near-net-shape casting. In this case, a shot-peening must be conducted on the tooth of ADI gears to increase its bending strength. The surface durability of conventional shot-peened ADI gears decreases because surface roughness increases by the conventional shot-peening with shots diameter of 0.3 mm. The authors applied two types of Fine Particle Shot-Peening with shots diameter of about 40〜50μm in order not to make the gear tooth surface rough. As a result of experiments, the surface durability of Fine Particle Shot-Peened ADI gear is improved compared with conventional shot-peened one because the tooth surface roughness does not increase. In addition, the surface integrity, i.e. surface roughness, hardness, residual stress, is investigated in relation to the surface durability.
社団法人日本機械学会の論文
2002-06-25