| Project/Area Number |
17360064
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Production engineering/Processing studies
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| Research Institution | Okayama University |
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Principal Investigator |
UNO Yoshiyuki Okayama University, GRADUATE SCHOOL OF NATURAL SCIENCE AND TECHNOLOGY, PROFESSOR (20029341)
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| Co-Investigator(Kenkyū-buntansha) |
OKADA Akira OKAYAMA UNIVERSITY, GRADUATE SCHOOL OF NATURAL SCIENCE AND TECHNOLOGY, ASSOCIATE PROFESSOR (60263612)
OKAMOTO Yasuhiro OKAYAMA UNIVERSITY, GRADUATE SCHOOL OF NATURAL SCIENCE AND TECHNOLOGY, ASSISTANT PROFESSOR (40304331)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥16,420,000 (Direct Cost: ¥15,700,000、Indirect Cost: ¥720,000)
Fiscal Year 2007: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2006: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2005: ¥10,800,000 (Direct Cost: ¥10,800,000)
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| Keywords | ELECTRON BEAM / METAL MOLD / SURFACE FINISHING / SURFACE MODIFICATION / SURFACE TREATMENT / CORROSION RESISTANCE |
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| Research Abstract |
A new finishing process for metal molds by large-area pulsed electron beam irradiation is proposed. The large-area electron beam irradiation equipment used here was recently developed for surface treatment or surface modification. Electron beam with high energy density can be irradiated without concentrating the beam. Then, large-area electron beam with a maximum diameter of 60mm can be used for melting or evaporating metal surface. Using this system, the possibility for high efficient finishing of metal molds is experimentally discussed.
Main conclusions obtained are as follows;
(1) Under a proper EB irradiating condition, the surface roughness of ED Med metal mold surface can be reduced from 6μmRz to 0.7μm in just a few minutes by large-area EB irradiation. Also, the glossiness can be improved very well.
(2) Very thin resolidified layer is formed on metal mold. The structure of the resolidified layer differs from that of the base material, in which the grain size becomes smaller by large-area EB irradiation.
(3) Surface smoothing is performed by concentrating EB onto convex parts in this method.
(4) The corrosion resistance and the repellency of metal mold surface can be improved by large-area EB irradiation, simultaneously with surface smoothing, whereas the surface hardness a little decreases.
(5) Even if the tilting angle of surface is close to 90 degrees, the surface roughness could be improved very well, which indicates that in the case of small simple shaped mold consisting of relatively small tilting surfaces, the smoothing of the whole surface is possible in a few minutes without moving and tilting the mold.
(6) The thickness of removed material on the EB irradiated surface is very small and almost constant, which make it possible to finish the metal mold surface precisely.
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