Development of an artificial joint with excellent fluid film lubrication performance: Part 3 : Improvement of the surface roughness of Ti-13Zr-13Nb artificial femoral head by ELID grinding processing@@@第３報 ELID研削によるTi合金製人工関節摺動部材の表面粗さの改善

Abstract

We have developed an ELID (ELectrolytic In-process Dressing) grinding technique that creates mirror-like surfaces on Ti-13Zr-13Nb alloys. To create a smooth surface, a metal-bonded grinding wheel was used for rough grinding and then a rubber-bonded wheel was used for final grinding. The optimum conditions for rough processing were a rotational speed of 400 rpm, a cut depth of 0.5 mm, a 40 mm/s feed rate of the work , and pitch interval for feeding in the y-direction of 1 mm. For final grinding, the optimum spark-out scanning time was 20 min. This new ELID processing technology decreased surface roughness to 30 nm (Ra).