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Micromachines 2019, 10(1), 72; https://doi.org/10.3390/mi10010072

Multi-Response Optimization of Electrical Discharge Machining Using the Desirability Function

Institute of Manufacturing Technology, Warsaw University of Technology, 00-661 Warsaw, Poland
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This paper is an extended version of our paper published in the XIII Internation al Conference Electromachining 2018 that was held in Bydgoszcz, Poland, 9–11 May 2018.
Received: 16 November 2018 / Revised: 9 January 2019 / Accepted: 14 January 2019 / Published: 20 January 2019
(This article belongs to the Special Issue Product/Process Fingerprint in Micro Manufacturing)
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Abstract

Electrical discharge machining (EDM) is a modern technology that is widely used in the production of difficult to cut conductive materials. The basic problem of EDM is the stochastic nature of electrical discharges. The optimal selection of machining parameters to achieve micron surface roughness and the recast layer with the maximal possible value of the material removal rate (MRR) is quite challenging. In this paper, we performed an analytical and experimental investigation of the influence of the EDM parameters: Surface integrity and MRR. Response surface methodology (RSM) was used to build empirical models on the influence of the discharge current I, pulse time ton, and the time interval toff, on the surface roughness (Sa), the thickness of the white layer (WL), and the MRR, during the machining of tool steel 55NiCrMoV7. The surface and subsurface integrity were evaluated using an optical microscope and a scanning profilometer. Analysis of variance (ANOVA) was used to establish the statistical significance parameters. The calculated contribution indicated that the discharge current had the most influence (over the 50%) on the Sa, WL, and MRR, followed by the discharge time. The multi-response optimization was carried out using the desirability function for the three cases of EDM: Finishing, semi-finishing, and roughing. The confirmation test showed that maximal errors between the predicted and the obtained values did not exceed 6%. View Full-Text
Keywords: electrical discharge machining; electrical discharge machining (EDM); surface roughness; surface integrity; optimization; desirability function electrical discharge machining; electrical discharge machining (EDM); surface roughness; surface integrity; optimization; desirability function
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Świercz, R.; Oniszczuk-Świercz, D.; Chmielewski, T. Multi-Response Optimization of Electrical Discharge Machining Using the Desirability Function. Micromachines 2019, 10, 72.

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