• Ross, Nimel Sworna
• Shafeer, Pk
• Adediran, Adeolu A.
• Ishfaq, Kashif

Abstract

<jats:p> Fabrication of complex and flat shapes is usually processed by milling operation with multi-point cutting tools. In this research, the potential of cryogenic and dry milling was investigated under varying cutting speed (50–250 m/min) and the feed (0.05–0.15 mm/tooth), while machining of AISI 52100 steel at a constant depth of cut. PVD TiAlN coated carbide cutting tool was employed in this research. The results show a reduction of 52%–78% in the white layer (WL) thickness under cryogenic cooling (LN<jats:sub>2</jats:sub>) environment due to its high thermal cooling effect. A drop out of 49% in the cutting temperature has also been observed if LN<jats:sub>2</jats:sub> cooling is used instead of dry milling. Cryogenic cooling provides a 28%, 28%, and 29% decrease in the cutting forces; F<jats:sub>X</jats:sub>, F<jats:sub>Y</jats:sub>, and F<jats:sub>Z</jats:sub>, in comparison with the dry milling. Furthermore, the roughness of the machined specimen reduces by 29% if the LN<jats:sub>2</jats:sub> cooling mechanism is engaged in milling of AISI 52100. Study of chips morphology revealed that the cryogenic LN<jats:sub>2</jats:sub> machining produced discontinuous, thin and small serrated chips with silver color. </jats:p>

Topics

• impedance spectroscopy
• morphology
• silver
• grinding
• milling
• physical vapor deposition
• carbide
• steel