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1 Journal of Machine Engineering

1 2007

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Development of A New Integrated Machining System ~ Improvement of Surface Characteristics on Metallic Biomaterials With a New Electrical Grinding System ~

Mizutani M., Katahira K., Ohmori H., Komotori J.

Journal of Machine Engineering

2007

Vol. 7, No. 1

15--23

Bio-implants, such as artificial joints, require high efficiency and precision processing because they are intricate forms. Especially, in the case of the stem of artificial joints, it is necessary to produce in the form united with the patient. In addition, the downsizing of bio-implant materials has been progressing, thus requiring ultra-precision processing techniques. Biomaterials also require enhanced chemical stability and mechanical properties, which are dependent on the quality and thickness of the oxide layer on their surface. Therefore, if we can form a thick and stable oxide layer during machining process, it is very effective in improving the surface properties. This will also help us to skip other surface treatment and allow for significant saving in energy. In this study, to discuss the applicability of an ELID (Electrolytic In-process Dressing) grinding for finishing process of biomaterials, the ground surfaces were analyzed. Finished surfaces produced by a new electrical grinding system showed higher corrosion resistance and tribological properties as compared to those of the polished surfaces. It is believed that this new system improves corrosion resistance and tribological properties by creating a thick oxide layer with a diffused oxygen and carbon element.