ISSN: 2277-9655 [Balki * et al., 6(11): November, 2017] Impact Factor: 4.116 IC™ Value: 3.00 CODEN: IJESS7 http: // www.ijesrt.com© International Journal of Engineering Sciences & Research Technology [186] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY EXPERIMENTAL INVESTIGATION OF ENVIRONMENT FRIENDLY COOLING METHODS FOR DIFFERENT MACHINING CONDITIONS Nilesh Balki*, Balaji Nelge, Dr. Asha Ingle Department of Mechanical Engineering, MPSTME, Mumbai 400056, India Department of Mechanical Engineering, ICEM, Pune , India Department of Mechanical Engineering, MPSTME, Mumbai 400056, India DOI: 10.5281/zenodo.1042116 ABSTRACT 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. Keywords: Heat transfer coefficient, dry machining, wet machining, Vortex Tube Jet Assisted machining. I. INTRODUCTION There has been a growing interest in modelling of metal cutting process in recent years.so it has been also accompanied by the interest in modelling of thermal behaviour of the work piece. Thermal expansion affects the machining accuracy, hence the latter interest can be attributed to the demand for higher accuracy. Machining error caused by the thermal expansion of the work piece are expressed by the convective heat transfer coefficients. According to the L. Kops M. Arenson little has been reported on the rotating cylinder in a quiescent or in turbulent air (e.g. Mills, 1999). Similarly, there are many works on the subject of cooling by jets (e.g. Pelletier, 1984, Goldstein and Franchett, 1988, Journeaux, 1990). However, the literature search did not reveal any convection data for water cooling in conditions corresponding to turning [1]. Different approaches were carried out to predict quantitatively the temperature level and heat flux at the interface with cutting speed, feed rate, rake angle, tool geometry, tool material and work piece materials [2]. D. Ulutan explained the three- dimensional temperature fields on the chip, tool and work piece during machining, which is one of the most important characteristic of machining processes; since the fields can affect other properties such as residual stresses and tool wear, and thus tool life and fatigue life of finished parts. The finite difference method based model proposed in this paper offers very rapid and reasonably accurate solutions. Finite difference-based simulation results are validated with infrared thermal measurements which are determined from the machining of different materials under various cutting conditions [3]. II. MODELLING OF HEAT GENERATION Heat balance for the machining process can be written from First law of thermodynamics helps to calculate the heat balance. It is the summation of rate difference that thermal and mechanical energy enters and exits the control volume, and rate of heat generation is equal to the rate of energy stored within the control volume [4].