Novel EDM Thread Whirling Technique For Orthopedic Medical Screw Implant Application

Muhammad Faqrul Reduan , Abdul Majid (2013) Novel EDM Thread Whirling Technique For Orthopedic Medical Screw Implant Application. Project Report. UTeM, Melaka. (Submitted)

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Abstract

Due to the excellent combination of strength, low modulus and high corrosion resistance. Titanium alloys are increasingly used as biomaterials. Titanium is mainly used in orthopedic injury application, such as bone fracture which required screw fixation. However, the complicated geometrical design and tight tolerance of orthopedic screw limit its fabrication technique. Generally, high strength orthopedic screw were fabricated using single-point threading and thread whirling technique. However, there were few problem encounters by employing these techniques such as rapid tool wear, limited design flexibility, low accuracy and high capital cost. The suitable candidate to overcomes this problems is using electrical discharge machining process in which the material is removed by spark erosion. Since there is no physical contact between tool electrode and workpiece, the tool wear rate is low and the materials hardness is not dependent. In addition, the main advantages of using EDM technique are the accuracy and find surface integrity which is suitable for medical application. However, the selection of EDM as an alternative manufacturing technique for orthopedic screw required a scientific analytical justification of EDM capability compare to current techniques and propose a new EDM method for fabricating orthopedic screw. Three method are proposed and the performance of each method will be evaluated.

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