| Project/Area Number |
10650717
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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 |
Material processing/treatments
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| Research Institution | Hosei University |
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Principal Investigator |
OSAWA Hiroaki Hosei University, Faculty of Engineering, Professor, 工学部, 教授 (40176863)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Gass Generant / Superplasticity / Aluminum Alloy / RB / SPF / Truss Structure / ハニカム構造 |
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| Research Abstract |
Superplastic forming of aluminum alloy sheets was tentatively carried out, in which instead of using inert gas or air gas blowing, dilational work of inert gas during increasing temperature is utilized. Inert gas can be obtained by thermal decomposition of some chemical substances, so called GAS GENERANTS. Conventional forming apparatus for superplastic blow forming may be simplified and therefore cost down by applying this idea actually. Improvement of working conditions are also brought about at the same time. SuperPlastic Forming/Diffusion Bonding (SPF/DB) is known as a very effective way of forming, especially in USA for making hollow structural components of air plane's body structure. Feasibility of actual forming of superplastic aluminum alloy sheets by using GAS GENERANT and of making hollow structural component such as truss structure by not DB but Roll Bonding (Roll Bonding) were explored.
Detailed experimental examination reveals that some problems that must be solved would be occurred ;
1. Selection of materials of STOP OFF added GAS GENERANT and best volume fraction of each drug.
2. Pressure in the formed sheet during cooling down happens to go down to very low value, less than atmospheric pressure. In this case, if the thickness of formed part is very thin, a kind of buckling would be occfurred. The problem is how to protect this.
3. Bonding strength between two sheets after roll bonding must be maintained high enough.
4. Precise rolling process is also needed for avoiding the distortions of pattern printed.
Warm rolling machine was newly introduced for examining and solving these items and the optimum combination of skin and core materials was selected in the beginning. Surface treatment before roll bonding was improved as well. Finally formed components through this process that seems to be suitable actual use were obtained successfully.
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