Simulation of Micro–EDM Servomotor for Machining Micro Pits on Hip Implant

Abstract

Metal–on–metal articulation of hip implant suffers from friction due to the moving metal surface. Thus it would shorten the lifespan of the joint. One of the significant current discussions in biomedical field is to reduce the friction between the articulations surface. It was found that lubrication technique is applicable in order to reduce the friction. A surface texture which micro pits formation on the metal surface of hip implant then was found to benefits the lubrication performance. Due to many advantages offered by electrical discharge machining especially in micro machining, it is utilized for machining the micro pits in this research. Thus, this paper is proposing on machining and control method for this purpose in terms of workpiece placement, coordination and orientation related to the electrode of the electrical discharge machining system. In this paper, a design of motor control simulation has been made using DC motor, Proportional–Integral controller and particle swarm optimization in order to get a better performance of micro–machining positioning for this purpose. From the simulation, the result obtained showed that the model could give a better positioning when using particle swarm optimization technique.