| Project/Area Number |
61850024
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
機械工作
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| Research Institution | Yokohama National University |
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Principal Investigator |
NAKAYAMA Kazuo Professor, Yokohama National University, 工学部, 教授 (60017845)
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| Co-Investigator(Kenkyū-buntansha) |
ARAI Minoru Reseach Assistant, Yokohama National University, 工学部, 助手 (20020406)
TAKAGI Jun-ichiro Assistant Ptofessor,Yokohama National University, 工学部, 助教授 (20111700)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1987: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1986: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Helical groove / Super-abrasive wheel / CBN wheel / plating-bonded wheel / Grinding performance / Grinding forces / Coolant / 砥石寿命 / クリープフィード研削 / 砥石の製造 |
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| Research Abstract |
Helical grooves enqraves a conbentional alumina wheel proves to show favorable effects on the improvement of grinding performance such as decteasing of grinding forces and elimination of grinding burn. This research is to apply such helical grooves to super-abrasive wheels which are very expensive but have high grinding performance.
Obtained results are as follows:
For resin-bonded cBN wheel, hilical grooves decrease the grinding forces remarkably while the roushness of grouns surface ands wheel wear deteriorate due to poor grain holding of resin-bound. However, for wheels with pore-less bond such as resion or metal, the effect of helical grooves to improve the coolant penetration to the grinding point is notable and only 0.3mm deep grooves provide sufficient coolant to remove grinding heat and prevent grinding burn.
Helical grooves formed on plating-bonded cBN wheel dectrase the number ofd grain cutting edges which are engaging with workpiece in contact arc area. Therefore, when the wear flat area inctrases, helical grooves relieve the rapid increasing of grinding forces and consequently the wheel lifr and utilize expensive super-abrasives efficiently.
Several economical methods to engrave hilical grooves on super-abrasive wheel face are also attempted. For plating-bonded wheel, grooves can be formed witout difficulty using masking method on the wheel face. For resin-bonded wheel, a aluminum disc with thin molded strips of grain layer glued on a wheel face is produced as a trial and it proved to have good grinding performance and sufficient durability in wet condition.
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