Preliminary investigations into nano-finishing of freeform surface (femoral) using inverse replica fixture
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It is difficult to achieve nano-level surface finish on freeform surfaces. Femoral (knee joint) is one of such components which has freeform surface. Finishing operations are very costly and time consuming. Surface finish of femoral plays a major role in its functionality, efficiency, and life expectancy. To have uniform (or minimum variation) surface roughness value along its curvature, an inverse replica of the femoral component as a fixture has been designed and fabricated so that the magnetorheological (MR) fluid velocity is approximately constant in different areas of the femoral. In this work, an attempt has been made for achieving comparatively more uniform finish on different surfaces and reducing the time required for finishing femoral. For this, a special tooling is used in rotational-magnetorheological abrasive flow finishing (R-MRAFF) process. Different extrusion pressures have been used to examine the effect on percentage change in Ra, finishing rate, and final surface finish of the femoral in both directions, X and Y. Minimum surface roughness of 78 and 89 nm has been achieved on femoral from the initial surface roughness of 172 and 178 nm in X- and Y-directions, respectively.
KeywordsFreeform surface Nano-finishing MR fluid Femoral (knee joint) Inverse replica R-MRAFF
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We acknowledge the help of Manufacturing Science Lab and 4i Lab, IIT Kanpur for extending their facilities to fabricate fixtures for femoral and other devices. This paper is a revised and expanded version of the paper entitled “Preliminary investigations into nano-finishing of freeform surface (femoral) using inverse replica fixture” by Leeladhar Nagdeve, V. K. Jain, J. Ramkumar, presented at the 6th International and 27th AIMTDR Conference (2016) held at College of Engineering Pune, India, during 16–18 December 2016.
- 1.Jain VK (ed) (2016) Nanofinishing science and technology: basic and advanced finishing and polishing processes. December 22, 2016 by CRC Press, Reference - 655 Pages - 327 B/W Illustrations, ISBN 9781498745949 - CAT# K26967Google Scholar
- 2.Saito K (1984) Finishing and polishing of freeform surfaces. Bull Japan Soc Mech Eng 18:104–109Google Scholar
- 3.ASTM standard: F2083-11 standard specifications for total knee prosthesis, 1–9. https://doi.org/10.1520/F2083-11.2
- 7.Nagdeve L, Jain VK, Ramkumar J (2016) Nano-finishing of freeform surfaces: a review. J Inst Eng India (IEI) Prod Div 1:50–57Google Scholar
- 10.Baghel P, Singh S, Nagdeve L, Jain VK, Dua Sharma N (2015) Preliminary investigations into finishing of artificial dental crown. Int J Precis Technol 5:229–245Google Scholar
- 11.Kumar S, Jain VK, Sidpara A (2015) Nanofinishing of freeform surfaces (knee joint implant) by rotational-magnetorheological abrasive flow finishing (R-MRAFF) process. Precis Eng 42:165–178. https://doi.org/10.1016/j.precisioneng.2015.04.014 CrossRefGoogle Scholar
- 15.Rosler. oberflachentechnik GmbH, Compact Drag Finisherhttp:/etypo3p.rosler.com/blaetterkatalog/blaetterkatalog/pdf/complete.pdf
- 16.OTEC prazisionsfinish GmbH. An Overview of the Machines. http://www.oteccusa.com/brochure.pdfs/Medical%20brouchure.pdf
- 21.Sidpara A, Jain VK (2012) Magnetorheological fluid based nanofinishing of flat and freeform surfaces. Ph.D. Dissertation, Indian Institute of Technology, Kanpur, Kanpur IndiaGoogle Scholar