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The demand ofCFRP ( Carbon Fiber Rein鉛 rced Plast 正 cs )has become heavy fbr its light weight and high strength ． But it is a problem that the machining cost becomes high because the toel life is very short ． An objective ofthis research is te clarify the tooi wear mechanism ． So the innuence upon tool wear by the fiber orientation of CFRP was fc 〕cused on ． Then tool wea ら cu 杭ing fbrce and cutting temperature were measured during the milling of the unidirectional CFRP ． As a result of the experiment ， the relationship between tool wear and 且ber or 瓦 entation ofCFRP was made cleaL

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