断続切削によってマイクロディンプルが付与された金属材の摩擦特性

抄録

Tribological properties of textured surface fabricated with discontinuous micro cutting process were investigated. An aluminum cast alloy (AC8A) disc was used for the specimen. The texturing process was carried out with a CNC machining center with a novel geometry of the cutting edge. The resulted surface morphology consisting from micro dimples having 200-300 μm of the diameter and 5-10 μm of the depth with controlled area fraction of 10 and 40 % and the milling cut finished top region. The tribological properties evaluated with a ring on disc type testing apparatus in lubricated condition showed that the friction coefficient of the textured surface was low and stable from the beginning of the experiment. Dependence of the area fraction of the friction coefficient was also found. It is concluded that the proposed discontinuous micro cutting process is effective means to fabricate micro texture for reduction and stabilization of the friction resistance.