Abstract
The present study is focused on liquid nitrogen treatment of M2 tool steel for 12 hours, 24 hours, and 36 hours at -196 0 C followed by tempering at 150 0 C. The treated tool samples are used for machining low carbon steel on a CNC lathe to varying combinations of Spindle speed (700, 1100 & 1800 rpm), Feed rate (0.1, 0.125 & 0.15 rev/mm) and Depth of cut (0.15, 0.3 & 0.45 mm). Taguchi's Design of experiments and ANOVA methods are used to statistically analyze the effect of cutting parameters and cutting forces on the tool wear and surface roughness after experimentation. SEM analysis is carried out to investigate the type of tool wear experienced by the cutting tools. The regression analysis has resulted in a model to predict the values of surface roughness, tool wear and friction coefficient, with a maximum error of ±6% from the actual experimental values.
Highlights
The life of cutting tools is one of the important factors which affect the production rate in the manufacturing industry
The study is aimed at Liquid nitrogen treatment of M2 tool steels and evaluating the effect of different holding durations on the machining performance during turning operations
The study was carried out using M2 singlepoint cutting tools which were Liquid nitrogen treated for 12 hours, 24 hours, and 36 hours durations at 1960C temperature
Summary
The life of cutting tools is one of the important factors which affect the production rate in the manufacturing industry. The major problem in the cutting tools during functional are tip wear and sudden failure due to the vibrations occurred, which affects the life and increases the production cost [1]. These failures can be reduced by improving the internal properties of the cutting tool materials. LNT is an additional step after the heat treatment method and it is a one-time treatment in which the retained austenite is converted into martensite [3] Properties such as Tensile strength [4], Hardness [5], fatigue behaviour [6] and wear resistance [7,8,9] were found to be increasing by the various researcher. The Temperature between -80 to -140 °C is known as Shallow cryogenic treatment - SCT and −140 and −196 °C is known as Liquid nitrogen treatment- LNT [13].The treatment generally includes cooling down the cutting tools below subzero temperature, using liquid nitrogen, at
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