DEVELOPMENT OF HIGH-SPEED PRECISION SPINDLES FOR DRILLING MACHINES USING WATER-LUBRICATED CONICAL BERAINGS

使用水润滑锥形轴承的钻床高速精密主轴的开发

基本信息

批准号：
09555057
负责人：
YOSHIMOTO Shigeka
金额：
$ 3.78万
依托单位：
SCIENCE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

Recently, the size of many electric and photo-electric devices has been reduced and printed circuit-boards used in these devices have been also required to be smaller. Accordingly, the diameters of small holes for fixing electric parts on the printed circuit-board have to be reduced. Water-lubricated hydrostatic conical bearings with spiral grooves were designed for high speed spindle to drill these small holes on printed-circuit boards. Comparing with oil-based hydrostatic bearings, water-lubricated hydrostatic bearings have lower power consumption at high speeds and do not have the environmental problems. In addition, this bearing has larger load capacity than aerostatics bearings since higher supply pressure can be used due to the incompressibility of water. Researchers have already investigated the bearing characteristics of a water-lubricated conical bearing for high speed spindles.In this study, a high speed spindle using the proposed bearing was developed. Various bearing performances such as rotational accuracy, load capacity, stiffness, torque and temperature rise, were measured. It was found that the developed spindle is excellent performances for drilling machines. Furthermore, drilling test at speed of 140,000 rpm was performed because it is important for this kind of spindle to be able to achieve high accuracy of hole shape and hole position. From this test, it was clearly demonstrated that the developed spindle can achieve excellent drilling performances.

最近，许多电动和光电设备的大小已减小，并且在这些设备中使用的电路板也需要较小。因此，必须减少用于固定电路板上电动零件的小孔的直径。设计带有螺旋凹槽的水润滑静水锥形轴承，用于高速主轴，可在印刷电路板上钻这些小孔。与油基静水轴承相比，水润滑的静水轴承在高速下的功耗较低，并且没有环境问题。另外，由于水的不可压缩性，该轴承的负载能力比空气稳定的轴承更大，因为可以使用更高的供应压力。研究人员已经研究了高速纺锤体水润滑锥形轴承的轴承特性。在这项研究中，开发了使用建议轴承的高速主轴。测量了各种轴承性能，例如旋转准确性，负载能力，刚度，扭矩和温度升高。发现开发的主轴是钻井机的出色性能。此外，执行以140,000 rpm的速度钻孔测试，因为对于这种纺锤来说，能够达到孔形和孔位置的高精度很重要。从该测试中，可以清楚地证明开发的主轴可以实现出色的钻孔性能。