A comparative study on optimization of machining parameters by turning aerospace materials according to Taguchi method

Abdullah Altin

doi:10.1051/smdo/2016015

Abstract

The effects of cutting tool coating material and cutting speed on cutting forces and surface roughness were investigated by Taguchi experimental design. Main cutting force, F z is considered as a criterion. The effects of machining parameters were investigated using Taguchi L18 orthogonal array. Optimal cutting conditions were determined using the signal-to-noise (S/N) ratio which is calculated for average surface roughness and cutting force according to the “the smaller is better” approach. Using results of analysis of variance (ANOVA) and signal-to-noise (S/N) ratio, effects of parameters on both average surface roughness and cutting forces were statistically investigated. It was observed that feed rate and cutting speed had higher effect on cutting force in Hastelloy X, while the feed rate and cutting tool had higher effect on cutting force in Inconel 625. According to average surface roughness the cutting tool and feed rate had higher effect in Hastelloy X and Inconel 625.

Highlights

Advanced materials, such as nickel-base and titanium alloys as well as composites are generally used at 650 °C or higher temperatures at which high stresses occur and surface integrate required
analysis of variance (ANOVA) results for the main cutting force (Fz) and surface roughness S/N ratio in Inconel 625 and Hastelloy X are given in Tables 6–9 (Figures 4 and 5)
The low surface roughness value, best performance will refer to the literature processed surfaces the lowest surface roughness values for the smaller the better S/N characteristic Due to the use in the analysis of at least the surface roughness and cutting forces for the smaller the better S/N characteristic is used

Summary

Introduction

Advanced materials, such as nickel-base and titanium alloys as well as composites are generally used at 650 °C or higher temperatures at which high stresses occur and surface integrate required. These materials are widely used in industrial gas turbines, space vehicles, rocket engines, nuclear reactors, submarines, stream production plants petrochemical devices, hot tools and glass industries [1]. Alloy 625 has extensive use in many industries for diverse applications over a wide temperature range from cryogenic conditions to ultra hot environments over 1000 °C [6,7,8,9]. Material Thermal conductivity (W/mK) Hardness (RB) Yield strength (MPa) Breaking extension (5do) Tensile strength (MPa)

Experiment specimens

Machine tool and measuring instrument of cutting forces

Results and discussion

Results of Taguchi analysis

Results and conclusions