| Abstrakt: |
Out of all the mechanical energy generated during material cutting, the majority is converted into heat, raising the temperature at the chip-tool interface, particularly in difficult-to-machine materials like Inconel 718, thereby diminishing tool lifespan. Consequently, various lubri-cooling methods mitigate issues related to high temperatures, such as reduced tool life and geometric distortions. The most employed method is cutting fluids application (CFA), but this approach poses several problems, including high cost and environmental and operator hazards. As a result, several techniques have been developed to lower machining temperatures, such as minimum quantity lubrication (MQL), cryogenics, and indirect tool cooling. In this study, an innovative method of tool cooling via internally cooled tool (ICT) was devised and tested. In this approach, the cooling fluid circulates in a closed loop without direct contact with the workpiece or even any fluid dispersion to the atmosphere, increasing environmental appeal and reducing manufacturing coasts. The developed method was compared with temperature measurements taken through thermography and a tool-workpiece thermocouple during the turning of Inconel 718. Two factorial designs studied temperature in Inconel 718 turning via thermocamera and tool-workpiece thermocouple. Additionally, the tool coating (TiNAl or AlCrN + TiNAl), cutting speed, feed, and depth of cut were varied. Using the tool-workpiece thermocouple method, ICT and CFA did not observe any statistically significant temperature difference. However, between ICT and DM, ICT exhibited a lower temperature at the tool-workpiece interface. With thermal imaging, ICT displayed a lower chip temperature than DM. In sum, internally cooled tools emerge as an innovative and environmentally sustainable solution for machining Inconel 718. They offer outstanding heat removal capabilities and substantial advantages over cutting fluids while significantly surpassing the performance of dry machining, thereby addressing crucial concerns in sustainable machining practices. [ABSTRACT FROM AUTHOR] |
