Abstract
An experimental investigation was conducted to determine the effects of tool cutting edge geometry and workpiece hardness on the surface roughness and cutting forces in the finish hard turning of AISI 52100 steel. Cubic boron nitride inserts with various representative cutting edge preparations and through-hardened AISI 52100 steel bars were used as the cutting tools and workpiece material, respectively. This study shows that the effect of edge geometry on the surface roughness and cutting forces is statistically significant. Specifically, large edge hones result in higher average surface roughness values than small edge hones, due to increase in the extent of ploughing compared to shearing. The effect of the two-factor interaction of the edge geometry and workpiece hardness on the surface roughness is also found to be important. Additionally, large edge hones result in higher forces in the axial, radial, and tangential directions than small edge hones. It is also shown that the effect of workpiece hardness on the axial and radial components of force is significant, particularly for large edge hones.
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