PREDICTING THE EFFECTS OF CUTTING PARAMETERS AND FLOW RATES, PRESSURES OF MINIMUM QUANTITY LUBRICATION (MQL) ON CUTTING FORCE AND SURFACE ROUGHNESS IN MILLING OF HARDENED STEEL S50C ON 5-AXIS CNC MACHINING CENTER

Abstract

The paper analyses and evaluates the effect of cutting parameters, flow rates, and pressures in minimum
quantity lubrication system on cutting force and surface roughness in the milling process of S50C carbon steel
materials after heat treatment (reaching a hardness of 52 HRC). The Taguchi method, one of the most effective
experimental planning methods nowadays, is used in this study, and the statistical analysis software, namely
Minitab 19, is utilized to build a regression model between parameters of the cutting process, flow rates and
pressures of the minimum quantity lubrication system and the cutting force, surface roughness of the part when
machining on a 5-axis CNC milling machine. Thereby analyzing and predicting the effect of cutting parameters
and minimum quantity lubrication conditions on the surface roughness and cutting force during machining, also
applying analysis of variance (ANOVA) to determine the influence level of parameters milling process as well as
minimum quantity lubrication system to the cutting force and surface roughness when milling. This study
provides the foundation for future research as well as an application in the field of machining.