Minimum Quantity Lubrication ( MQL ) is a newly developed lubricating technology in which only a minimal amount (usually less than 100ml/h) of lubrication is sprayed toward the cutting zone in form of oil mist. This new cooling/lubricating method has been regarded as an efficient means to solve the environmental, health and economic problems existing in traditional flood cooling method. Surface integrity is an important aspect of physical property that determines performance of machined components in terms ...