EXPERIMENTAL INVESTIGATION OF ENVIRONMENT FRIENDLY COOLING METHODS FOR DIFFERENT MACHINING CONDITIONS

This study deals with the experimental investigation of temperature and heat generation during machining process and cooling methods. Elevated temperatures generated in machining operations significantly influence the process efficiency and the surface quality of the machine part. Heat transfer between the chip, the tool, and the environment during the metal machining process has an impact on temperatures, wear mechanisms and hence on tool-life and on the accuracy of the machined component. This study deals with experimental study of different cooling methods for different machining conditions. In this presented work cooling has been determined by calculating the heat transfer coefficient. Experiments on work piece cooling conducted on a lathe provided reference temperature data for a model of a cylindrical work piece, which was solved for temperature using a Control-Volume Finite Difference method. Heat transfer coefficients were obtained for various convective boundary conditions existing on a work piece when cooling in VTJA air and in coolant. Cooling characteristics calculated using these heat transfer coefficients showed good agreement with the experiment. Presented approach can be used to obtain the convective heat transfer coefficients for studies on modelling thermal behavior of a work piece in other conditions.