Abstract
Electrical discharge machining (EDM) has experienced steady growth in engineering applications since its emergence. This paper has presented positioning control of electrical discharge machining (EDM) device for improved transient response performance. A model dynamic of a DC servomotor responsible for positioning tool electrode on a workpiece was obtained. The controlled variable is the angular shaft position which was made the output of the process in the model transfer function. A proportional integral and derivative (PID) compensator was designed using robust response time tuning method with interactive, adjustable performance and robustness of the Matlab control tool box. The designed compensator was integrated with the servomotor to form a closed loop control system. Simulations were performed for uncompensated and compensated conditions of the machining process. The results obtained indicated that with the compensator in the loop, the transient response performance of the servo positioning was largely improved.
Highlights
Electrical discharge machining (EDM) has experienced steady growth in engineering applications since its emergence
The voltage level established between the tool electrode and a work-piece is due to a gap existing between the tool and electrode
It occurs at a small gap between the tool electrode and work-piece known as the spark gap [3]
Summary
Electrical discharge machining (EDM) has experienced steady growth in engineering applications since its emergence. The operational principle in the EDM process is such that an electrical potential difference is applied between the tool electrode and a work-piece. The movement of the tool electrode towards the work-piece in the presence of a dielectric fluid –deionised water or oil, acting as an insulator and coolant [3], generates a gap of strong electromagnetic flux as the tool electrode nears the work-piece. A spark is generated between the tool electrode and the workpiece arrangement as a result of the breaking down of the insulating effect of the dielectric fluid. The generated spark is between 6000-12000°C depending on the machining condition [5] It occurs at a small gap between the tool electrode and work-piece known as the spark gap [3]. As a Paulinus Chinaenye Eze et al.: Positioning Control of Electrical Discharge Machining Device for Improved Transient
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