| Project/Area Number |
05660190
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
林産学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
BANSHOYA Kaoru Hiroshima university. Fac.of School Education, Prof., 学校教育学部, 教授 (50101449)
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| Co-Investigator(Kenkyū-buntansha) |
MURASE Yasuhide Kyushu Univ.Fac.of Agric., Ass.Prof., 農学部, 助教授 (50038288)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | deep boring / crook of hole / structural laminated wood / wood machining / boring tool / bolt joint |
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| Research Abstract |
Many wooden structures by structural lamineted wood can be seen in Japan recently. In this structure, bolt joint is adopted and many deep holes are bored with long drill. Some problems, for instance, the crook of bored hole and so on have been pointed out by manufacturing factory.
In this work, after we made experimental apparatus, we examined about the crook of bored hole in the deep boring of structural laminated wood with long drill. From the experimental results, although the crook of this work material with the deepest hole of 300mm became larger as the feed per revolution became larger, the degree of it was small as compared with that of squared Douglas-fir timber. In the square Douglar-fir timber, the crook of bored hole became larger as both angle of annual rings to bore surface on cross section of wood and feed per revolution became larger and as the depth of boring hole became deeper. Hence it was concluded that the crook phenomenon of bored hole of structural lamineted wood was not affected by the angle of annual rings to bore surface on cross section of wood very much because this work material was made by laminationg bark side and pith side alternately. Well, as we confirmed in this experiment that the run out of drill's extreme during boring was affected by tool rigidity and the exhaust of chip became more difficult as the depth of boring hole became deeper, we want to design long drill with high rigidity and with smooth exhaust of chip.
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