Abstract
The effect of workpiece tilt angle (0°, 30°) and tool ultrasonic vibration was evaluated when machining hardened steel with electroplated CBN grinding points (B15, B30, B54). Workpiece inclination had the greatest influence in decreasing surface roughness (Ra) by up to ∼44%, with the lowest value (∼0.32 µm) achieved at 30° tilt angle when ultrasonic assisted grinding using B30 wheels. Despite also reducing roughness, use of ultrasonic actuation generally increased specific volumetric grit loss (∼11%) and normal forces (∼14%) compared to conventional grinding when employing B15 and B30 points. No substantial microhardness modification was evident in most of the ground surfaces.
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