Developing a Mathematical Model to Determine the Surface Roughness

This paper presents an on-going comparative study of tool wear and surface roughness for varying cutting parameters under dry and Minimum Quantity Lubrication (MQL) environment while turning hardened medium carbon steel (hard turning) by coated carbide insert. A mathematical model was also developed to determine the surface roughness in terms of machining time and cutting tool wear function in terms of the four independent variables: the cutting depth (d), the cutting feed (f), the cutting speed (Vc) and the cutting duration (t). The results indicated that the application of MQL technique significantly helps to obtain better performance in compare to dry condition.