Ultrasonic-Assisted on the Turning of Inconel 718 by Taguchi Method

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Abstract
This paper presents an experimental investigation on the turning of Inconel 718 using tungsten carbide and cermet insert tools with ultrasonic-assisted. The Taguchi method as well as an L18 orthogonal array, signal-to-noise (S/N) ratio and analysis of variance (ANOVA) are employed to examine the performance characteristics of the turning operations. The effect of the machining parameters (cutting tool, depth of cut, cutting speed, feed rate, working temperature and ultrasonic power) on roundness and flank wear in the turning operations are studied. For roundness, depth of cut (σ = 38.40 %) and feed rate (σ = 22.59 %) were recognized to make significant contributions. For flank wear, the significant contribution order was cutting tools (σ = 51.16 %) for different materials, follow working temperature (σ=22.37 %), depth of cut (σ = 13.59 %), and ultrasonic power (σ = 5.79 %). Cutting with ultrasonic-assisted improves roundness by 17.78 % to 45.73 %, and improves flank wear by 26.52 % to 46.26 7%. Finally, turning experiments with 5-20 nm nano-particles cutting fluid were investigated. The experimental results indicated the cutter-workpiece friction force is noticeably reduced and cutter service life is prolonged.

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