Enforcement of stricter environmental policies demands alternative methods that could reduce the usage of cutting fluid during machining. Thus, dry machining and minimum quantity lubrication (MQL) machining are gaining practical importance. Due to enhanced mechanical and thermal properties, aluminium based nanocomposites have wide application in aerospace and automobile industries. In this work, asqueeze cast hybrid nanocomposite is developed with the reinforcement of 0.5 wt% hexagonal boron nitride and 1 wt% alumina particles in the base matrix of Al 7075 that is subjected to a squeezing pressure of 150 MPa. During the turning of this hybrid nanocomposite, thefeed rate is varied (0.1, 0.2, and 0.3 mm/rev)and its influence on the generated forces, tool wear and surface roughness under dry and MQL environments is performed. The results are compared with squeeze cast unreinforced aluminium alloy and presented.

Drilling holes in carbon fiber-reinforced polymer (CFRP) laminates are more prone to incur damage during machining. Surface damage could be considerably minimized through the adoption of cryogenic assisted machining. The economic and safety implications associated with cryogenic technology necessitate the exploration of alternate technologies. In this research work, the effects of cutting velocity (100, 125, and 150 m/min) and feed rate (0.03, 0.06, and 0.09 mm/rev) on thrust force, surface roughness, delamination, and acoustic emissions are studied during the drilling of CFRP laminates under chilled air environment and compared with dry drilling. The output parameters are found to be much influenced by feed rate than cutting velocity. Under high feed rate and cutting velocity, the delamination factor, surface roughness, and acoustic emissions are, respectively, reduced by 13.2, 10.5, and 7.4% for the drilling performed under chilled air environment over dry condition. About 9.9% increased thrust force is observed for chilled air-assisted drilling under the identical machining condition.

Minimum Quantity Lubrication (MQL) results a better cooling effect than the boundary lubricated and dry environment, besides being environmental friendly. Very few investigations have been carried out on the influence of MQL parameters, such as oil flow rate and air pressure on grinding performance. Since grinding comprises both cutting and sliding, it is necessary to provide a balanced environment of heat extraction and lubrication. Thus it requires a controlled grinding environment such as MQL. The current study is an experimental investigation on the significance of the MQL parameters on grinding performance of Inconel 751. Inconel is an ideal material for high temperature applications although it poses difficulties during machining, especially grinding. It was found that better results were obtained for the optimal MQL condition in grinding in terms of reduced grinding force, temperature, and roughness. Also it was found that there is hardly any crest flattening on the surface being ground with minimum quantity lubrication. Induction of MQL facilitates considerable reduction in the grinding forces, temperature, and roughness, apart from the absence of visible grinding burns.