A composite boring bar, whose stability against chattering is superior to not only conventional steel bars but also cemented carbide bars, has recently been developed. The main material of this composite bar is pitch-based carbon fiber reinforced plastic. Carbon fibers aligned unidirectionally in the longitudinal direction of the bars give high bending stiffness. Four types of bar having different shaped steel cores were designed by FEM analysis and produced for actual testing. A bar having a cross-shaped steel core shows the best cutting capability and stability amongst all bars designed.
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