Multi-response optimization of electrochemical machining parameters in the micro-drilling of AA6061-TiB₂in situ composites using the Entropy–VIKOR method

Abstract

<jats:p> This article describes the multi-response optimization of electrochemical machining operating parameters such as voltage, concentration of the electrolyte, and current to maximize the rate of material removal in addition to minimize the over cut and delamination at the same time in micro-drilling of AA6061-TiB<jats:sub>2</jats:sub> in situ composite. A novel Entropy–VIKOR method is applied to handle such mutually conflicting responses. The weight of each response is computed from the entropy method, and VIKOR method is used to rank the various levels of parameters. This method yields the combination of 2 mol of electrolyte concentration, 16 V of applied voltage, and 4 A of current as optimal parameters to minimize the over cut and delamination in addition to maximize the rate of material removal at the same time. This optimal process-governing parameters satisfied the conditions for compromising solution such as acceptable advantage and acceptable stability condition. The response graph illustrates that, of the parameters investigated, electrolyte concentration has the greatest effect on the VIKOR index, followed by applied voltage and current. Scanning electron microscopic analysis illustrates that the radius of the hole is equal throughout the periphery, except for one instance of micro-delamination. </jats:p>

Electrochemical arc micro-drilling of Nickel-Titanium SMAs utilizing GRA-based AHP and RSM

“…It has also been found craters in the white layer [39]. The discontinuous machining provided electrochemical debris and uneven disintegration of the surface around the hole [23]. The wide craters on the MS were also spotted due to high DE [40].…”

“…Fig. 2 (a) Delamination of hole [23,31], hole diameter and maximum diameter for (b) exp. run 1 (electrolyte concentration as 0, tool rotation as 0 and voltage as 60V), (c) exp.…”

“…The MRR can be as much as five and forty times greater than respectively EDM and ECM when thermal electrical discharges in the machining gap aid the ECM process and this process has been termed electrochemical arc machining (ECAM) [22]. Furthermore, the supervision of radial overcut and delamination are tiring assignments in ECM [23]. A hybrid NCM process like ECAM can be utilized for machining NiTi SMAs because more work should be done on the ECAM.…”

Multi-response optimization of the actively driven rotary turning for energy efficiency, carbon emissions, and machining quality

“…Step 3: The weight of each turning response is calculated using the entropy method. 34,35 For higher the better approach, the measured response (r ij ) is computed as:…”

Multi-ion Based Modelling and Experimental Investigations on Consistent and High-throughput Generation of Micro Cavity Array by Mask Electrolyte Jet Machining

“…Compared to the aforementioned methods, electrochemical micromachining (EMM) [11] is a promising method for preparing micro cavities [12], as it has unique advantage such as a good control on cavity profile, the potential for multi-response optimization [13], independence of material hardness [14] and toughness [15], absence of a heat-affected layer, lack of process related tool wear and burrs, and a high throughput capability. Throughmask electrochemical micromachining (TMEMM) is a promising method for generating array-like surface microstructures.…”