Abstract
The current study challenges the multi-objective optimization of electric discharge machining (EDM) parameters. EDM is used for creating profiles by machining of workpiece that are difficult to machine by conventional method. In the current work four responses such as material removal rate (production rate), tool wear rate, surface roughness (quality) and circularity (profile) are collectively investigated with varying controlling parameters. The human decision for best combination of controlling parameters for highest performance has uncertainties, which results in inferior solution. The multiple responses along with uncertainties and impreciseness can be addressed by combining a neuro-fuzzy system with particle swarm optimization (PSO). To illustrate the superiority of the proposed approach a set of experiment have been conducted in EDM process using AISI D2 tool steel as workpiece and brass tool. The experimental plan was made according to the Box-Behnken response surface methodology design with four process parameters namely discharge current, pulse-on-time, duty factor, and flushing pressure. The four response parameters such as material removal rate, tool wear rate, surface roughness, and circularity of machined components were optimized simultaneously. One unique Multi-response Performance Characteristic Index was obtained by combining the four responses using the proposed neuro-fuzzy technique. A regression model was developed on single response and optimized by PSO to obtain the optimal parameter setting. An experiment was conducted on optimal parameter to test the optimum performance. It is observed that the EDM responses were affected significantly by discharge current and pulse-on-time. The increase in pulse-on-time leads to larger surface cracks and more micro-pores on the machined surface.Article HighlightsRSM was proven to be an effective statistical tool for reducing the experimental runs, and also establishes the relation between multiple inputs and single output.The neuro-fuzzy system combined with PSO results a suitable model to convert multiple response into an equivalent single response.The presented approach can be a practical method for situations where multiple conflicting objectives are needed to be optimized at the same time.
Highlights
The Electrical Discharge Machining (EDM) is a state of the art machining process
This paper presents a structured and generic methodology that includes both response surface methodology (RSM) as well as artificial intelligence (AI) tools to minimize the uncertainty in decision-making
Since the responses are contradicting in nature, they were converted to S/N ratio to make them into the same characteristic nature as explained in Sect
Summary
The Electrical Discharge Machining (EDM) is a state of the art machining process. In the EDM process a series of electric sparks is established between the tool and the workpiece causing the removal of material through controlled erosion. The complexity of the EDM process results in difficulty to establish the relation between the process parameters and their responses. The process performance measures such as material removal rate (MRR), tool wear rate (TWR), surface roughness Ra , and circularity r1∕r2 have been considered for performance analysis [2]. Many process parameters influence the abovementioned responses in differnt ways. Parameters such as discharge current IP , pulse-on-time Ton ,duty factor (τ) , and flushing pressure fP significantly affect the EDM process [3]
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