Abstract
In this paper, an optimization of chromium powder mixed parameters effect, i.e. discharge current, pulse on time and Cr powder concentration of AISI D2 steels in Powder Mixed EDM (PMEDM) has been made. RSM has been employed to plan and analyzed the experiment. Central composite design (CCD) was chosen as the RSM design that is useful for investigating the quadratic effects. The version 8.0 of the Design Expert software was used to develop the experimental plan for RSM. A mathematical model in the form of the multiple regression equation for second order response surface with the best fittings was developed. The results identify that discharge current and pulse on time the most important parameters effect to minimize recast layer. With the topmost desirability solution, the suggested optimum parameter of discharge current is 20.12 A, pulse-on time 50.14 µs and 3.96 g/L powder concentration to minimize recast layer.
Highlights
Following the innovation of assembling industry today, machining process is confronting challenges from the promoting request that expected to utilize advanced materials, for example, composite, super alloys, and hardened steels that so difficult to machine
To re-establish the machined surface properties and evacuate the surface recognizes, the procedure of fine powder blended into the dielectric liquid of EDM, called the powder mixed EDM (PMEDM), is in this manner proposed [1, 2]
3.1 Machining Setup and Experimental Design Abovementioned, there are three chromium (Cr) powder mixed parameters effect i.e. discharge current, pulse on time and Cr powder concentration were chosen as variables to study the process performance in terms of recast layer
Summary
Following the innovation of assembling industry today, machining process is confronting challenges from the promoting request that expected to utilize advanced materials, for example, composite, super alloys, and hardened steels that so difficult to machine. The morphology of the recast layer is ordinarily poor; showing high surface unpleasantness and containing pores and splits These morphological highlights commonplace of EDM'd surfaces constrain the weakness execution of the part because of stress focus impacts. This paper expects to recognize the elements which impact the recast layer This will permit the surface properties of EDM'd materials to be all the more unequivocally controlled and more unsurprising. Modelling and Optimization of Chromium Powder Mixed EDM Parameter Effect Over the Surface Characteristics by RSM Approach Figure 2: Chromium powder was suspended in the dielectric fluid. Working Parameters Workpiece Electrode Dielectric Cr powder size Concentration, C Polarity, P Peak Current, Ip Pulse-on, Pon Duty Cycle Voltage Depth of Cut Flushing rate. Description AISI D2 CuW (Ø 10mm) Kerosene and Cr powder 45-55μm 0, 2, 4g/l Reverse Polarity 20, 30, 40A 50, 75, 100μs 80% 120V 3mm 3.5lmm3/hour
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