従来，高分子材料の光造形は鋳型や機械部品の試作加工として開発されたもので，汎用化された加工技術ではなかった．しかし．今日のマイクロマシン加工技術に要求される半導体部品から光ナノプリント加工技術などにおいて紫外線ビームや電子線ビーム照射によって硬化する樹脂の開発によりマイクロまたはサブマイクロ加工に関する技術が注目されるようになった．%The fatigue and tribological characteristics of spur gears composed of photo setting resin composites (PSRCs) containing various fillers were investigated experimentally. The materials used in the experiment were photo setting acrylic resin (PSA) and photo setting epoxy resin (PSEP), cured by irradiation with a helium-cadmium (He-Cd) ultraviolet laser (UVL) at a wavelength of 325nm. The optimum after-cure time in stereolithography molding is 15-20min-utes. The fillers used here are potassium titanate whisker (PTW); magnesium potassium titanate oxide (MPTO); organic modified montmorillonite, which are also used as a nanocomposite filler (OMMT); micro glass beads (MGB); and quartz glass beads (QGB). Photo setting resin composites (PSRCs) containing the respective fillers at l-5wt% were prepared.rnThe results of the experiment are summarized as follows. The fatigue strength of the photo setting acrylic resin (PSA) composites filled with MPTO filler increased by 15% and that of the PSA composites filled with OMMT filler increased by a factor of nearly two times. The coefficient of friction of the PSA composites increased by 4-20%, and specific wear volume increased by 60%. That is, the tribological characteristics of the PSA/MPTO and PSA/OMMT composites decreased. In addition, the fatigue strength of photo setting epoxy resin (PSEP) composites containing MGB filler at l-5wt% increased by 30-50% and that of the PSEP composites filled with QGB filler at 1-5 wt% increased by a factor of about two. Moreover, by compounding with MGB filler, the coefficient of friction of the PSEP/MGB composites was equal to that of PSEP itself, and specific wear volume decreased by 26-68%. Besides, the coefficient of friction of PSEP/QGB composites increased by 8%, whereas the specific wear volume decreases from 17% to 62%. Consequently, by virtue of their high fatigue strength, low coefficient of friction, and low specific wear volume, and the photo setting epoxy resin composites (PSEP/QGB) proved to be optimum materials for micro spur gears.
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