Experimental eva‎luation of CBN Tools an‎d Lubrication-Cooling Strategies in Machining of Hardened Steel

9/14/2026 12:00:00 AM

This research investigates the machining performance of MO40 steel under various cooling strategies (cryogenic, dry, MQL, an‎d flood cooling) an‎d different feed rates. The primary objective of this study is to determine the influence of process variables on the surface quality of the workpiece—assessed by measuring roughness parameters such as Ra an‎d Rz— an‎d to analyze tool wear in order to improve the tool life an‎d performance of cutting tools. To achieve these goals, machining tests were conducted with controlled process parameters, including constant cutting speed an‎d depth of cut. The collected data were eva‎luated using surface measurement tools an‎d digital analysis techniques. The results indicate that cryogenic cooling at an optimal feed rate leads to a significant reduction in surface roughness an‎d an improvement in surface uniformity, whereas dry machining an‎d MQL exhibit non-uniform trends in both surface roughness an‎d tool wear. Furthermore, tool wear length measurements reveal a marked dependency on the type of cooling strategy an‎d feed rate; for instance, under cryogenic an‎d flood cooling conditions, an increase in feed rate results in a decrease in tool wear length. Additionally, Pearson correlation analyses between feed rate an‎d surface roughness parameters demonstrate nonlinear relationships an‎d high sensitivity of certain strategies (such as MQL) to feed rate changes. These findings provide a foundation for optimizing production conditions an‎d developing sustainable machining strategies, an‎d they offer recommendations for future research, including direct measurement of cutting temperatures an‎d forces, as well as the implementation of predictive models.

ماشينكاري فولاد MO40 , استراتژيهاي خنك كاري , سايش ابزار , زبري سطح , روانكاري حداقل مقدار

MO40 Steel Machining , Cooling Strategies , Tool Wear , Surface Roughness , Minimum Quantity Lubrication

Mohammad Ahmadi

Dr.Behnam Davodi