| Project/Area Number |
59850024
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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 | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
1984 – 1985
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| Project Status |
Completed (Fiscal Year 1985)
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| Budget Amount *help |
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1985: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1984: ¥4,200,000 (Direct Cost: ¥4,200,000)
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| Keywords | LIQUID-GAS TWO PHASE FLOW / MACHINE TOOLS / BEARING / LUBRICATION / 静圧軸受 |
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| Research Abstract |
In the first fiscal year:
(1) Before designing, the two problems of sealing and exhausting the oil supplied into the bearing surface and preventing oil intrusion into the air supply holes were solved by means of vacuum pump and design of the exit shape of air holes, respectively.
(2) The new model of main bearing of grinder hydrostatically lubricated by liquid-gas two layer film was designed being based on the numerical calculation of the static bearing performance and considering the above mentioned method, and was manufactured.
In the last fiscal year:
(3) The static performance of this bearing model was estimated by the experiments. The experimental results were in good agreement with the results of the calculation for the design.
(4) The anti-seizure performance against over load due to the existence of the oil film was evaluated. The results are shown as follows:
(a) The bearing stiffness increases abruptly when the shaft contacts on the oil film at large eccentricity, and thus the thin oil film is effective to prevent bearing damages against over load.
(b) The oil film thickness under over load is scarcely affected by the flow rate of supplied oil, and consequently a little oil flow rate is sufficient to prevent bearing damages with in the limit of the existence of the oil film layer.
(5) It is concluded that the application feasibility of this new type of bearing for machine tools is demonstrated in spite of the structure complexity because it takes advantages of avoiding seizure at over loading which is a weak point of gas bearing as well as of low friction in gas bearing.
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