DEVELOPMENT OF ULTRA HIGH SPEED SPINDLE USING A POROUS FLOATING BUSH FOR DRILLING MACHINES

钻床用多孔浮套超高速主轴的开发

基本信息

批准号：
14350083
负责人：
YOSHIMOTO Shigeka
金额：
$ 4.35万
依托单位：
TOKYO UNIVERSITY OF SCIENCE
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350083/
关键词：
AEROSTATIC BEARING POROUS MATERIAL INSTABILITY FLOATING BUSH SPINDLE

项目摘要

Recently, the size of devices associated with information has been rapidly reduced.Accordingly the diameter of holes in printed circuit boards installed in these devices is getting smaller and the demand of higher rotational speed of more than 200,000 rpm is also increasing for drilling spindles to manufacture small holes.Considering the future trend for miniaturization in these devices, high speed spindles with rotational speed of more than 300,000 rpm has to be developed.In this research, we proposed aerostatic journal bearings with a porous floating bush to improve the stability of a rotor supported by aerostatic bearings at high speeds.In the proposed bearing, pressurized air is fed only to both floating bush ends, but both the outer and the inner walls of a floating bush can function as an aero static bearing due to the effect of porous material.In addition, a very small gap at both ends of a floating bush can avoid the pressure reduction of pressurized supply air, which makes this porous bearing maintain stiffness and load capacity comparable to an ordinary porous bearing. We theoretically investigated various performances of the proposed bearing such as load capacity, stiffness and instability at high speeds.Then we manufactured the proposed floating bush journal bearings based on, the theoretical calculations and compared experimental results with theoretical calculations.As a result, the following conclusions were obtained.(1).It was experimentally confirmed that the proposed aerostatic journal bearing with a porous floating bush has an excellent stability at high speeds.(2).The validity of theoretical calculations was confirmed by comparing them with experimental results.(3).It was found that the manufactured high speed spindle using the proposed bearings has excellent performances as a drilling machine for very small holes.

最近，与信息相关的设备的尺寸已迅速减小。在这些设备中安装的印刷电路板孔的直径越来越小，并且更高的旋转速度超过200,000 rpm的较高旋转速度的需求也在钻孔纺锤体上增加，以增加制造小孔的钻孔。在这些设备中，在这些设备中的未来速度相比，在这些设备中，高速旋转的速度是高速旋转的速度，而不是旋转速度，比旋转速度更高，而旋转速度比旋转的速度更高。研究，我们提出了带有多孔浮动灌木丛的空气日记轴承，以提高在高速下由空气轴承支撑的转子的稳定性。在拟议的轴承中，加压空气仅用于两个浮动的灌木丛，但由于浮动的效果很小，因此浮动的灌木丛可以避免浮出水面，但由于浮动的效果很小。减少加压供应空气，这使得多孔轴承保持刚度和负载能力可与普通多孔轴承相当。我们从理论上研究了所提出的轴承的各种表现，例如高速载荷能力，僵硬和不稳定。速度。（2）。通过将它们与实验结果进行比较来证实理论计算的有效性。（3）。发现使用所提出的轴承的制造高速纺锤可以作为非常小孔的钻孔机的出色表现。