EXPERIMENTAL INVESTIGATION OF MACHINING OF ALUMINIUM 7075 UNDER WET AND MQL TYPE LUBRICATING METHOD – A REVIEW

Mechanical Engineering

In present time the technology of CNC vertical milling machine has been improved significantly to meet the advance requirements in various manufacturing fields, especially in the precision metal cutting industry, and to get the quality and better surface finish the use of lubrication while machining is necessary. So in most of the industries generally they use traditional method of lubrication like wet lubrication method. In which the amount of lubricant required more than the sufficient, due to which the amount of waste in the form of lubricant increases. Which may harmful to the environment as well as to the human life. To overcome this drawbacks now in some of the industries uses Minimum quantity Lubrication (MQL) technique over wet Lubrication technique. MQL is a micro lubrication technique that facilitates fine machining. It eliminates large quantities of water and mineral oil-based cutting fluids and replaces them with a small quantity of environment-friendly lubricant (mostly vegetable oils) mixed with air. In MQL-assisted machining, a small amount (10–250 mL/h) of cutting fluid is introduced to the chip-tool interface region along with compressed air, which acts as the carrier medium, as a replacement for several liters per hour of wet lubrication technique. So in this experiment we are going to compare the results of wet and MQL lubricating methods in the form of surface finish. This experiment is carried out on CNC Engraving machine by using the Aluminium 7075 as a work piece material. Aluminium 7075 due to its high strength, low density and thermal properties is vastly used in aircraft fittings, gears and shafts, aerospace applications, etc. In this experiment we are using Taguchi for the design of experiment which is mostly used for single optimization.

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