Electrical Discharge Machining (EDM) is used as to shape, cut and creation of complex and deep cavities in a range of conductive materials (metals). The biomedical industry is becoming more and more interested in micro-machining, especially in terms of improving hip implant lubrication. To meet this demand, the creation of micro pits is suggested to improve lubrication, thereby prolonging the durability of hip implants. In this regard, specific crater dimensions will be established at various locations and depths on the surface of the hip-implant as to minimize friction between two metallic surfaces. As a result, this paper presents an innovative design for a Pulse Power Generator (PPG), which considers the optimal of material removed, the wear ratio, the density of surface cracks, and the finished material quality. While the RC type generator yields superior surface quality, its machining efficiency may be compromised by the time required to charge the capacitor. Therefore, it is highly advisable to utilize a transistor pulse generator to machine hip implants, as it offers significant improvements in the removal rate due to its increased machining speed.

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Transistor Type Power Generator for Machining Hip Implant Micropits

  • Azli Yahya,
  • Nazriah Mahmud,
  • Nor Hisham Khamis,
  • Norhalimah Idris

摘要

Electrical Discharge Machining (EDM) is used as to shape, cut and creation of complex and deep cavities in a range of conductive materials (metals). The biomedical industry is becoming more and more interested in micro-machining, especially in terms of improving hip implant lubrication. To meet this demand, the creation of micro pits is suggested to improve lubrication, thereby prolonging the durability of hip implants. In this regard, specific crater dimensions will be established at various locations and depths on the surface of the hip-implant as to minimize friction between two metallic surfaces. As a result, this paper presents an innovative design for a Pulse Power Generator (PPG), which considers the optimal of material removed, the wear ratio, the density of surface cracks, and the finished material quality. While the RC type generator yields superior surface quality, its machining efficiency may be compromised by the time required to charge the capacitor. Therefore, it is highly advisable to utilize a transistor pulse generator to machine hip implants, as it offers significant improvements in the removal rate due to its increased machining speed.