著者

大上 祐司

出版者

香川大学

雑誌

基盤研究(C)

巻号頁・発行日

2006

---

結晶を微細化する熱処理とショットピーニングを組み合わせた材料強化加工法によって微細結晶化するメカニズムを調査し, しゅう動機械要素の表面強度向上を実現するための加工条件を明らかにすることを目的としている. 提案加工法では長寿命化が可能で, 加工時間の短縮に由来する製造コスト低減を達成できる. さらに, 加工により創製されるディンプル形状は油膜厚さを向上させる. 提案加工法は, 材料表面特性と潤滑性能の観点から従来の方法よりも有利であった.

著者

吉田 彰 大上 祐司 關 正憲 荒瀧 拓之 烏野 勇

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.67, no.661, pp.2961-2968, 2001-09-25

被引用文献数

4

---

The purpose of this study is to investigate the influence of shot peening on surface durability of sintered powder metal rollers under a sliding-rolling contact condition. The compressive residual stress, the hardness and the surface roughness of the rollers increased and the pores near the surface of those were deformed by the shot peening. The failure mode of the rollers was mainly spalling. The failure depth agreed almost with the depth where the amplitude A(τ_<yz>/HV) of the ratio of the orthogonal shear stress to Vickers hardness became maximum. The surface durabilities of the shot-peened rollers were lower than that of the unpeened roller in these experiments. While, the spalling cracks propagated from the sharp notches of the pores deformed by the shot peening. In addition, it can be considered that the shear stress below the contact surface of the shot-peened rollers increases, since the increase of the surface roughness by the shot peening results into the increase of the frictional force between the rollers. Therefore, it could follows from this that the mild shot peening without sharp deformed pore and too large surface roughness should be selected in order to improve the surface durability of the sintered rollers.