2016 Fiscal Year Final Research Report
Ultrasonic cavitation assisted fluid jet polishing
| Project/Area Number |
15H06320
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Production engineering/Processing studies
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Research Collaborator |
KATSUURA Tomoya 京都大学, 大学院工学研究科
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| Project Period (FY) |
2015-08-28 – 2017-03-31
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| Keywords | 研磨 / マイクロバブル / 超音波キャビテーション / 除去率 / 表面粗さ / 超精密 / 光学 / 人工関節 |
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| Outline of Final Research Achievements |
Fluid jet polishing is a versatile process used in super-fine finishing of complex optics and prosthetic joints. Its advantages include highly controllable sub-millimetre polishing footprints and absence of tool wear. But the very low material removal rate means that hard materials such as cemented carbides and super-alloys, used in optical surfaces and prosthetic joints, cannot be polished from a rough condition.
In this research, we proposed a new method for adding finely controlled micro-bubbles into the slurry jet by ultrasonic cavitation. Acoustic and fluid dynamics simulation confirmed that under the right conditions, cavitation bubbles generated in the nozzle can reach the surface of the workpiece before collapsing. A prototype system was fabricated, and micro-bubbles could be observed at the nozzle outlet using a high-speed camera. Polishing experiments data then showed that micro-bubbles boost removal rate by up-to 380%, without causing any degradation of the surface finish.
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| Free Research Field |
超精密研磨
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