Research by King Mongkut' s Institute of Technology North Bangkok on MQL

Name : Benjarong oupanoy, Pradit Mahasaksiri
Project Title : Minimum quantity lubrication for turning machine
Pages : 88 leaves
Department : Production Engineering
Institution : King Mongkut' s Institute of Technology North Bangkok
Project Advisors : Asst. Prof. Dr. Surapol Raadnui : srr@kmitnb.ac.th
Academic Year : 2002




The purpose of this research is to study the effects of MQL (minimum quantity lubrication) on the cutting properties of hard turned parts, compared to conventional feeding. In machining, a coolant is still essential in many cases to achieve an economical tool life and the required surface qualities. This applies particularly in Hard Turning, a super finishing process, which cut hard materials. Nowadays, Environmental regulations controlling lubricants have increase every year driving up the cost of using lubricants in the cutting process. Consider dioxins and high cost as an example.
For that reason, the minimum quantity lubrication (MQL) could be an interesting alternative. Minimum Quantity Lubrication is a modem technology that executes the actual lubrication of mechanical processes within modem machine tools and hereby replaces the traditional coolant feeding. A tool work combination has been performed for each process. It helps understanding the behavior of the tool and the workpiece under hard turning cutting conditions, involving high thermal and mechanical mechanisms. Cutting parameters (cutting speed, feed, depth of cut) are included in a range bigger than the recommended cutting conditions for wider investigations.
The fIrst results of the rough test with a low flank wear are relevant. MQL seems to be an efficient device compared to dry cutting. Tool behavior and surface fmish are better with the small lubrication. The tool looks sharper and the surface roughness smaller with the same cutting forces. Cutting temperature is also smaller, that should minimize thermal damages into the tool and the workpiece. MQL is successful to reduce a coolant estimate 90% from this research.

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