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.
S. Murugappan, Dr. Sanjivi Arul, and Narayanan, S. K., “Quality assessment of drilled holes in Al 6063 plate at sub zero temperature”, International Journal of Applied Engineering Research, vol. 10, pp. 31329-31340, 2015.