Study on Pulse Duration of Supercritical Carbon Dioxide Coolant Delivery on Machining Performance of AISI 1045

In the new global economy, consumption has become a central issue for many fields of industries. This project work studied on the effectiveness of pulse duration of supercritical carbon dioxide (SCCO2) in machining performance in terms of cutting temperature, cutting force and surface roughness in turning AISI 1045 medium carbon steel by uncoated cemented carbide insert. Pulse mode reduces the quantity used for cutting fluids because of the decrease of spray duration. The minimization of cutting fluids also brings economic benefits by way of saving the carbon dioxide and lubricant costs. The encouraging result includes the reduction of lubricant flow rate consumption and machining cost while maintaining significant performance, such as cutting temperature, cutting force and surface roughness. The performance of SCCO2 pulse cooling is comparable with continuous cooling with only 34% maximum increment in temperature, 3.64% increment of cutting force, 14% increment of surface roughness and 36.18% increment of tool life. KeywordCryogenic coolant, Lathe, Pulse, Supercritical carbon dioxide, Sustainable machining