Abstract
In machining hard surfaces the biggest challenge is the removal of heat produced during the machining operation and the lubrication required to reduce the frictional force at the machining zone. The present paper is divided into three sections. The first section describes the introduction concepts of heat removal along with different environmental conscious machining methods. The second section discusses about the compressed air cooling method by Ranque-Hilsch vortex tube and the popular theories related to the energy separation method in vortex tube. Finally, the third section discusses about various applications of compressed air-cooling method in machining with various materials along with different machining processes and comparison with other cooling methods. This paper concludes that the separation of fluid into cold and hot in vortex tube is due to several effects simultaneously and not a single theory is able to explain it completely. Cold air-cooling system is more environment friendly, decreases the cutting force, increases the tool life, increases the surface finish, eases the chip evacuation process, nonhazardous to operator and it has the ability to replace the traditional lubrication system and a more research is needed in this direction so that the device can be adopted in practical use in industry.
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