KEY PARAMETERS TO MONITOR THE USED METALWORKING FLUIDS

This paper presents simple statistical instruments to identify some characteristic parameters for water-based metalworking fluids monitoring and to develop a regression model for spent emulsions evaluation. By Factor Analysis and Loading Plot, the surface tension and pH values are proposed as significant physical-chemical parameters that can be adequately used to monitor and to characterize metalworking fluids. Two modified exponential equations have been developed to correlate these surface tension - pH measurements data in order to monitor and label the spent metalworking fluids. The results obtained are valuable as they are based on easy, fast and low-cost measurement of the two parameters, thus contributing to maintain the quality of machinery functioning and to reduce pollution by minimizing the waste.