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Effects of Parameters on Sourface Roughness and Material Removal in EDM of High Chromium Steel-D7

Palwinder Singh*, Lakhvir Singh**

*-** Department of Mechanical Engineering, Baba Banda Singh Bahadur Engineering College, Fatehgarh Sahib, Punjab, India.

Periodicity:November - January'2020
DOI : https://doi.org/10.26634/jme.10.1.16576

Abstract

Electrical Discharge Machining (EDM) is one of unconventional processes utilized for machining the electrical conductive materials which cannot be processed by conventional processes. Thus, the study and analysis of EDM variables play an important role to improve the yield and safety of a surface. This research work focuses on the study and analyzes the influence of current, pulse on time T_(on) and pulse off time T_(off) by keeping other parameters constant on Surface Roughness (SR) and Material Removal Rate (MRR). In the present study, machining of high chromium steel-D7 using EDM was experimented with industrial/commercial electrodes of copper material for EDM of high chromium steel-D7. The Central Composite Design (CCD) of Response Surface Methodology (RSM) has been employed for designing the experiments. Scanning Electron Microscopy (SEM) was used. This paper reports the experimentally investigated results during EDM of high chromium steel-D7 with tool material copper electrode. The influence of EDM input variable parameters on SR and MRR were analyzed through different graphs. The Analysis of Variance (ANOVA) were employed to carry out the experiments, identify the significant parameters and optimize the input parameters for both the responses. The optimum parametric combination for smaller SR was found at current 4 A, T_on15 µs, and T_off15 µs and higher MRR was found at current 10 A, T_on 20 µs and T_off 10 µs with copper tool electrode. The surface characteristics on of the machined surface were analyzed by SEM and explained in the paper.

Keywords

Electrical Discharge Machining (EDM), Surface Roughness, Copper Electrode, Central Composite Design (CCD), Analysis of Variance (ANOVA), Scanning Electron Microscopy (SEM).

How to Cite this Article?

Singh, P., and Singh, L. (2020). Effects of Parameters on Sourface Roughness and Material Removal in EDM of High Chromium Steel-D7. i-manager's Journal on Mechanical Engineering, 10(1), 1-12. https://doi.org/10.26634/jme.10.1.16576

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