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1 2009

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A study of minimum quantity lubrication on Inconel 718 steel

Thamizhmanii S., Rosli, Hasan S.

Archives of Materials Science and Engineering

2009

Vol. 39, nr 1

38-44

Purpose: Maching of difficult to cut materials like Inconel 718 is a difficult task. The purpose of the research was to machine Inconel 718 nickel based material by milling process applying vegetabled oil by minimum quantity lubrication (MQL). MQL helps to use limited supply of coolant in order to minimise waste and it is environmental free. Design/methodology/approach: The experiments was carried in a vertical milling machine with super hard cobalt tool. The experiments were carried by various cutting parameters like cutitng speed, feed rate and constant depth of cut. The MQL considered was 12.5, 25 and 37.5 milli litre per hour (ml/hr). The MQL was vegetable oil used for cooking purpose. The experiments were with on MQL and dry milling. Findings: The supply of 37.5 ml / hour produced low surface roughness than 12.5 and 25 ml/hr. As the length of time was increased, the surface roughness increased due to tool wear. The surface roughness was affected by 32.65 % and tool wear affected by 29.2 % between low and high supply of MQL. The super cobalt tool has given more life by MQL than dry milling. The cutting speed of 20 and 30 m/min produced more flank wear than by 10 m/min for the same feed rate and given depth of cut. Research limitations/implications: There was no formation of built up edge at tool due to reduction in the heat and flushing of the chips away from the tool edge. The MQL can able to subsidize the heat generataed. Originality/value: The originality of this paper lies with conducting experiments and finding optimum operating parameters. The other researches can have this as reference