Abstract
Turning machinability of a FRM composed of the ADC12 aluminum matrix and 10% volume fraction of Al2O3-SiO2 short-fibers was investigated under various cutting conditions using three types of sintered diamond bites with different rake angles. The result for the FRM was compared with that for the ADC12. Short-fibers in the shear zone of the FRM became the origin of the stress concentration and caused shear deformation during turning. The stress concentration led to the raised cutting ratio and shear angle and resulted in the reduction of the cutting resistance. The short-fibers were effective as chip breakers and produced favorable chip treatment characteristics. The finished surface was also favorable. Sintered diamond bites with negative rake angles were found to be effective in both the chipping and strength of the cutting edge for the difficult-to-work FRM which required intermittent cutting.
