Abstract
CFRP is utilized as a material for the shank of boring bars, to achieve higher cutting performance than that of conventional steel shank bars or carbide shank bars. Natural frequencies of CFRP considered its anisotropy by the rule of mixture is calculated by FEM. The equivalent mass-spring method is proposed to estimate the loss factor of CFRP. Combination of ultra-high modulus carbon fiber and matrix resin formulated to have specific damping characteristics consistently gives both of high natural frequencies and high loss factors. The loss factors of CFRP boring bar are calculated based on the mode strain energy method. High damping CFRP boring bars can be stably used at higher surface speed with longer critical overhang without chatter vibration.
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