Abstract
In this experimental work, the micro structure and the micro hardness of the surfaces machined under the dry EDM process is analyzed for AISI D2 tool steel and LM13 aluminum alloy. The experiments were conducted using copper tool electrode. Few modifications were made in the tool for conducting the experiments under dry EDM process. Discharge current, pulse on time, voltage, pressure, tool rotational speed and the duty factor were used as the various process parameters and their influence over the micro structure and micro hardness of the machined surfaces were analyzed. Better results were observed in the dry EDM process for AISI D2 tool steel, whereas dry EDM process did not reveal appreciable results for LM13 aluminum alloy.
Highlights
Electrical discharge machining (EDM) is a widely accepted machining process used for machining the hard materials
The micro structure and the micro hardness of the surfaces machined under the dry EDM process is analyzed for AISI D2 tool steel and LM13 aluminum alloy
Better results were observed in the dry EDM process for AISI D2 tool steel, whereas dry EDM process did not reveal appreciable results for
Summary
Electrical discharge machining (EDM) is a widely accepted machining process used for machining the hard materials. Higher MRR was reported in the ultrasonic assisted DEDM process at the expense of surface roughness In this experiment, ultrasonic vibrations were given to the work piece [11]. Kunieda et al (1997) [13] conducted experiments under DEDM process using a tubular electrode, and a central core was observed in the machined surface due to the non machining area of the tubular region. [15] proposed a special tool design for conducting experiments under DEDM process, and observed improvement in the characteristics of the machined surface. The main application of this work is (i) to achieve environment friendly – green machining process, where the toxic effects produced in conventional EDM processes are greatly avoided, and (ii) to improve the machining characteristics. The characteristics of the surfaces machined and the variation of the micro hardness for both the materials is compared
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