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Study on Hole Quality in Drilling AA 6063 Plate under Cryogenic Pre-Cooling Environment

Publication Type : Conference Proceedings

Publisher : Materials Today: Proceedings

Source : Materials Today: Proceedings, Elsevier Ltd, Volume 4, Number 8, p.7476-7483 (2017)

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Campus : Coimbatore

School : School of Engineering

Department : Mechanical

Year : 2017

Abstract : pAluminium 6063 alloy is known for high quality surface finish, strength to weight ratio and good resistance to corrosion. It is extensively used in architectural components, seamless and structural tubes and pipes, tubes and pipes for irrigation, heat sinks. Drilling is cheapest machining operation and constitutes 30% of total machining processes. Quality of drilled hole is important to save cost and time by controlling or reducing further processing viz. burr removal, reaming, boring etc. This study deals with the investigation of drilling AA 6063 at two different drilling environments. One is at room temperature without coolant and other is at shallow cryogenic temperature using dry ice. A hole is drilled with 11.9 mm diameter in AA 6063 plate of 10 mm thickness. Drilling was carried out in nine different combinations of cutting parameters at two different environments. The three different levels of cutting speed and feed rate are 25, 40, 66 m/min and 0.04, 0.08, 0.15 mm/rev. The advantages and disadvantages of different cooling environment are studied in terms of quality of burr by classifying it as per standards. Micro hardness on the top surface and cross sectioned surface of drilled plate, surface quality of the drilled hole are studied for two different cooling environments. The quality of hole is co-related with measured temperature. © 2017 Elsevier Ltd./p

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