| Project/Area Number |
25820023
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Production engineering/Processing studies
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| Research Institution | Gifu University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 摩擦法則 / ドライ加工 |
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| Outline of Final Research Achievements |
The friction behavior in dry metal forming is studied with a new tribometer. From the microscopic observation, it is found that the ratio of the flattened area starts to increase sharply when plastic deformation extends in the whole bulk. But, the nominal frictional stress increases linearly with the nominal contact pressure irrespective of the ratio of the flattened area. The surface texture of the flattened area is measured by using electron probe surface roughness analyzer. Before the start of bulk plastic deformation, the flattened area is smooth and almost the whole area seems to be real area of contact. After plastic deformation in the bulk material, the flattened area is roughened.
A new friction law for dry metal forming, Coulomb’s friction with constant friction coefficient holds up to the critical pressure and the law of constant frictional stress holds for the higher pressures, is proposed based on the experimental results.
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