Development of High Speed Machine Tool Main Spindle Using Liquid-Gas Two Layer Film Hydrostatic Bearing

液气两层膜静压轴承高速机床主轴的研制

• 批准号: 59850024
• 负责人: NAKAHARA Tsunamitsu
• 金额: $ 4.61万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1985
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59850024/
• 关键词: LIQUID-GAS TWO PHASE FLOW; MACHINE TOOLS; BEARING; LUBRICATION; 静圧軸受

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.

第一财年：(1)在设计前，分别通过真空泵和气孔出口形状的设计，解决了密封排油进入轴承表面和防止油侵入供气孔两个问题。(2)在静压轴承性能数值计算的基础上，考虑上述方法，设计了新型液气两层膜静压润滑磨床主轴承，并进行了制造。实验结果与设计计算结果吻合较好。(4)对油膜存在时的抗过载性能进行了评价。结果表明：(A)当轴与油膜接触时，轴承刚度急剧增加，因此薄油膜对防止轴承过载损伤是有效的；(B)过载时油膜厚度几乎不受供油流量的影响，因此，在油膜层存在的限度内，少量的油流量就足以防止轴承损坏。(5)尽管这种新型机床轴承的结构复杂，但由于它具有避免气体轴承的薄弱环节过载卡住的优点，而且气体轴承的摩擦力也很小，因此这种新型轴承的应用是可行的。

项目成果

Proc. of JSLE Spring Annual Meeting. (1985)

过程。

日本潤滑学会第30期春期研究発表会予稿集. (1986)

日本润滑学会第 30 届春季研究会议论文集（1986 年）。

日本潤滑学会第29期春期研究発表会予稿集. (1985)

日本润滑学会第 29 届春季研究报告会论文集（1985 年）。

Proc. of JSLE Spring Annual Meeting. (1986)

过程。