2002 Fiscal Year Final Research Report Summary
A study of the machining of surgical implant material
| Project/Area Number |
13650138
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
機械工作・生産工学
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| Research Institution | Kanazawa Institute of Technology |
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Principal Investigator |
SHINTANI Kazuhiro Kanazawa Institute of Technology, Engineering, Professor, 工学部, 教授 (80139758)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIMURA Shigeaki NeKoshiya Co. Ltd., New Industrial Development Division, Researcher, NID事業部, 研究職
KATO Hideharu Kanazawa Institute of Technology, Engineering, Associate Professor, 工学部, 助教授 (90278101)
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| Project Period (FY) |
2001 – 2002
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| Keywords | implant / binder-less cBN tool / high-speed cutting / bio-titanium alloy |
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| Research Abstract |
Recently, titanium alloys without containing vanadium are going to applied for material of surgical implant in place of conventional type of titanium alloy such as Ti-6Al-4V system, in order to eliminate a toxicological effect of vanadium for human body. In general, the temperature rise in the cutting edge is significant in cutting process of titanium alloys including above mentioned vanadium-free alloys, promoted strongly the adhesion between tool and work materials, resulting in tool failure within relatively short duration. Although surgical implants as a stem of an artificial hip joint are standardized in several specifications, their variations in size and form are not enough to fit every patient. To make them fit to any patients, it is required that these implants can be manufactured easily by machining with application of the patient's medical image data obtained by MRI or X-ray CT. Improvement of processing efficiency was tried in machining of above described bio-titanium alloy
… More
s. A binder-less PcBN tool which is prepared through the direct conversion sintering of hBN under both high pressure and temperature, exhibits an improved high temperature durability. The tool was applied for machining of the conventional Ti-6Al-4V alloy and two types of bio-titanium alloys, then cutting performance are evaluated. The wear resistance of a binder-less PcBN tool for machining Ti-6Al-4V alloy was superior to those of the tools made of cemented carbide, PcBN and polycrystalline diamond with Co-based binder. The performance of the binder-less PcBN tool for Ti-6Al-2Nb-1Ta alloy was almost equivalent to that for the Ti-6Al-4V alloy in flank wear characteristics. On the other hand, for machining of the Ti-15Mo-5Zr-3Al alloy, the cutting edge failed in earlier stage due to its higher strength and toughness than Ti-6Al-4V alloy. The reaction between PcBN and titanium alloy under a high thermal contact produced the diffusion layer with certain thickness which consisted of Ti, B and Al. It was clarified that the binder-less PcBN tool could improve tool life in high-speed milling of the Ti-15Mo-5Zr-3Al alloy. Less
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