Publication

Abstract : Drilling plays a key role in machining operation. The quality of hole is measured based on many metrics. Heat created during drilling affects the hole quality. A 11.9 mm (15/32”) diameter hole is drilled in 10mm thick AL 6063 plate at two different environments, at room temperature without coolant and another at-55°C Celsius using dry ice as pre cooling agent. The hole is drilled at nine different combinations of speed and feed using three cutting speeds 25, 40 66 m/min and feed rate 0.04, 0.08 0.15 mm/rev. Hole quality is assessed based on diameter deviation, conicity, surface Roughness Ra and Rz. The effect of cooling at sub zero temperature is discussed based on above quality metrics. © Research India Publications.