Title: Development of a new grinding system for finishing of hemispherical inside surface

Authors: H. Kotani; J. Komotori; T. Naruse; M. Mizutani; K. Katahira; H. Ohmori; M. Wasa; K. Sumiya

Addresses: Department of Mechanical Engineering, KEIO University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa 223-8522, Japan ' Department of Mechanical Engineering, KEIO University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa 223-8522, Japan ' Koriyama Technical Academy, 5, Uenoyama, Koriyama-shi, Fukushima 963-8816, Japan ' Materials Fabrication Laboratory, RIKEN Advanced Science Institute, 2-1, Hirosawa, Wakou-shi, Saitama 351-0198, Japan ' Materials Fabrication Laboratory, RIKEN Advanced Science Institute, 2-1, Hirosawa, Wakou-shi, Saitama 351-0198, Japan ' Materials Fabrication Laboratory, RIKEN Advanced Science Institute, 2-1, Hirosawa, Wakou-shi, Saitama 351-0198, Japan ' Mizuho Ikakogyo Co., Ktk., 30-13, Hongo 3-chome, Bunkyo-ku, Tokyo 113-0033, Japan ' Mizuho Ikakogyo Co., Ktk., 30-13, Hongo 3-chome, Bunkyo-ku, Tokyo 113-0033, Japan

Abstract: In this study, in order to apply electrolytic in-process dressing (ELID) grinding for surface finishing process of the sliding parts of metal on metal (MOM) artificial hip joints, a new grinding system to grind the inside surface of a hemispherical cup was developed. In this system, the work piece was pressurised against the centre of the ball shaped grinder with an oscillating pressure pin during the processing. The shape and the radius of the ball shaped grinder were adjusted by using different size abrasive grains. Hemispherical cup-shaped test pieces of 20Cr-2Ni-20Co stainless steel were ground by this grinding system and their surface smoothness was improved. This result suggests that this grinding system is applicable as a surface finishing process of the sliding parts of MOM artificial hip joints.

Keywords: new grinding system; ELID grinding; bioimplants; surface finishing; electrolytic in-process dressing; artificial hip joints; inside surfaces; hemispherical cups; medical implants; stainless steel; surface roughness; surface quality; biomedical engineering; bioengineering.

DOI: 10.1504/IJNM.2013.052883

International Journal of Nanomanufacturing, 2013 Vol.9 No.1, pp.77 - 86

Received: 05 Apr 2012
Accepted: 03 Oct 2012
Published online: 31 Mar 2014 *

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