Effect of peak current and peak voltage on machined surface morphology during WEDM of TiNiCu shape memory alloys
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DOI 10.1007/s12206-020-05 -y
Journal of Mechanical Science and Technology 34 (0) 2020 Original Article DOI 10.1007/s12206-020-2205-x Keywords: · Wire EDM · Peak current · Peak voltage · Surface morphology · Surface roughness
Correspondence to: Abhinaba Roy [email protected]
Citation: Roy, A., Sanna Yellappa, N., Pramanik, A. (2020). Effect of peak current and peak voltage on machined surface morphology during WEDM of TiNiCu shape memory alloys. Journal of Mechanical Science and Technology 34 (0) (2020) ?~?. http://doi.org/10.1007/s12206-020-2205-x
Effect of peak current and peak voltage on machined surface morphology during WEDM of TiNiCu shape memory alloys Abhinaba Roy1, Narendranath S.1 and Alokesh Pramanik2 1
2
Department of Mechanical Engineering, NITK Surathkal, Karnataka 575025, India, School of Civil and Mechanical Engineering, Curtin University, Perth 6102, Western Australia, Austrailia
Abstract
This study considers the effect of wire electro discharge machining (WEDM) parameter peak current (Ip) and pulse peak voltage (Vp) on the machined surface morphology of TiNiCu shape memory alloys. Various defects of machined surfaces were identified and correlated with parameter values and measured average surface roughness (Ra) and average surface depth (Rz). It was found that the nature of the machined surface is highly influenced by the nature of sparking, which is dictated by levels of peak current and peak voltage used during machining. Distinctions between machining parameters resulting in "rough-cut" and "trim-cut" machining are reported along with deviations in output responses, which counters the trend reported in the literature.
Received April 16th, 2020 Revised
May 16th, 2020
Accepted May 17th, 2020 † This paper was presented at ICMR2019, Maison Glad Jeju, Jeju, Korea, November 27-29, 2019. Recommended by Guest Editor Insu Jeon
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
1. Introduction Ti50Ni25Cu25 shape memory alloys are well known for actuators as well as biomedical applications [1, 2]. Microactuator and biomedical applications demand components having intricate profiles, which are possible to craft using WEDM technique where slow machining parameters were found to have positive results on fatigue life of WEDMed components [3, 4]. Previous experimental investigations revealed that WEDM parameters Ton (pulse on time) - 110 μs, Toff (pulse off time) - 30 μs, 45 volts servo voltage (SV) and 6 m/min wire feed rate (WF) resulted in suitable material removal rate, surface roughness, kerf width and recast layer thickness [5, 6]. As can be seen from Fig. 1. Ton is the duration for which electrical spark impinges on the workpiece resulting in melting of material, whereas Toff is the duration for which the spark discharge is halted to facilitate flushing of molten debris from the machining zone. Servo voltage (SV) determines the gap maintained during spark machining, and wire feed (WF) signifies rate at which fresh wire electrode i
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