Abstract
Surface finish is an important criteria in machining process and selection of proper machining parameters is important to obtain good surface finish. In the present work effects of the machining parameters in end milling of Inconel 718 were investigated. Central composite design was used to design the total number of experiments. A Mathematical model for surface roughness has been developed using response surface methodology. In this study, the influence of cutting parameters such as cutting speed, feed rate and depth of cut on surface roughness was analyzed. The study includes individual effect of cutting parameters on surface roughness as well as their interaction. The analysis of variance (ANOVA) was employed to find the validity of the developed model. The results show that depth of cut mostly affected the surface roughness. It is also observed that surface roughness values are comparable in both dry and wet machining conditions.
Highlights
Inconel 718 is a well known nickel-based super alloy used in structural materials because of its high strengthto-weight ratio, fracture toughness, fatigue strength, corrosion resistance and ability to operate at high temperatures
Surface roughness is significantly influenced by cutting speed, feed rate and depth of cut
There are a large number of tools available to develop predictive models for machining processes, namely Response Surface Methodology (RSM), Artificial Neural Network (ANN), Taguchi method, etc [5,6,7,8,9]
Summary
Inconel 718 is a well known nickel-based super alloy used in structural materials because of its high strengthto-weight ratio, fracture toughness, fatigue strength, corrosion resistance and ability to operate at high temperatures. Choudhary and Baradie [12] developed response model for tool life surface roughness and cutting force with central composite method using RSM. Yazid et al [21] investigated the effect of cutting parameters and machining conditions on surface integrity for turning Inconel 718. They reported that at low speed of 90 m/min and 120 m/min, 50 ml/h of lubricant shows a better surface roughness compared to 100 ml/h lubricant and the dry condition. MQL while using three different coated carbide tools TiCN/Al2O3/TiN (CVD), TiN/AlN superlattice (PVD) and TiAlN (PVD) for Inconel 718 in turning and reported that air pressure is an important parameter influencing tool life and surface finish. Design expert 9.0 was used to establish the design matrix and to analyze the experimental data
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