TAILIEUCHUNG - Designing and fabricating a small EDM machine
The main content of this paper concentrates on studying of designing and manufacturing a small- size electrical discharge machining (EDM) machine in order to meet the domestic demands in the field of machining the geometrically complex shape machine elements, hard materials or in case of severe requirements of precision, surface roughness. | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 15, SOÁ K1- 2012 DESIGNING AND FABRICATING A SMALL EDM MACHINE Phan Dinh Huan University of Technology, Hochiminh City National Key Lab of Digital Control and System Engineering, VNU-HCM (Manuscript Received on April 5th, 2012, Manuscript Revised November 20rd, 2012) ABSTRACT: The main content of this paper concentrates on studying of designing and manufacturing a small- size electrical discharge machining (EDM) machine in order to meet the domestic demands in the field of machining the geometrically complex shape machine elements, hard materials or in case of severe requirements of precision, surface roughness. These above cases can not be performed with the traditional machining processes. Based on the results of studying the working principle of the EDM method, the solutions for automatically controlling the tool electrode, all necessary materials available in vietnamese market, an EDM machine is successfully constructed. This machine includes the mechanical part, the electrical components (pulse generator), automatic control mechanism of tool electrode, pump system, filter, lighting, etc The initial machining operations have been also realized to determine some important technological parameters as well as to evaluate the obtained machining quality of this machine. Keywords: electrical discharge machining machine, EDM, automatic control mechanism 1. INTRODUCTION The main components of an EDM machine is described in figure 1. Both the tool usually made of graphite, copper, Cu- Wo alloy and the workpiece electrodes are connected to a DC pulse vertical feeding motion of particles. In industry, kerosene is commonly used as the dielectric. This one also plays the role of a coolant for the machined area and is an important factor to determine the sparked gap, the machining precision and the wearness ratio of electrodes etc. the tool is realized with an automatic control mechanism either with the aid of DC motor, DC
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