DEVELOPMENT OF INFINITELY STIFF HYDROSTATIC JOURNAL BEARINGS FOR HIGH SPEED SPINDLES UNISNG MINIATURIZED SELF-CONTROLLED RESTRICOTRS

用于高速主轴UNISNG小型自控限流器的无限刚性静压径向轴承的开发

基本信息

批准号：
10450068
负责人：
YOSHIMOTO Shigeka
金额：
$ 4.86万
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：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Recently, development of dry cutting method has been strongly desired because of reducing pollution in manufacture. In dry cutting, a high speed spindle is needed which can achieve large stiffness, high accuracy and low power consumption in high speeds. In this research, we propose a new type of infinitely stiff hydrostatic bearing with a miniaturized self-controlled restrictor in order to achieve the bearing performances mentioned above.In a hydrostatic bearing for high speed spindles, low viscous lubricant is usually adopted to avoid an increase of bearing power consumption. Therefore, it is necessary to investigate the bearing characteristics of the proposed hydrostatic bearing for low viscous lubricant. We obtained the following results. (1).The inertia effect of lubricant is greatly influenced on the bearing characteristics when the lubricant with viscosity of less than 10 cSt is adopted. (2).The inertia of lubricant reduces the static stiffness. (3).The proposed bearing can stably operate even when low viscous lubricant is used.Next, we discuss the new method to reduce the inertia effect of lubricant because this effect decreases the static stiffness. As a result, it was found that the static stiffness is greatly improved by using a porous restrictor instead of a capillary restrictor. This is because the porous restrictor can avoid the orifice effect, which occurs at the inlet of a capillary restrictor due to the inertia effect of lubricant. We investigated the static and dynamic characteristics of hydrostatic bearing with a self-controlled restrictor using a porous material. In addition, we applied this self-controlled restrictor to the hydrostatic journal bearing, and studied the static characteristics of the bearing, theoretically and experimentally. It was consequently found that the hydrostatic journal bearing with self-controlled restrictor using low viscous lubricant is very effective in achieving high stiffness, high accuracy and low power consumption.

最近，由于减少了制造污染，因此人们一直在强烈期望干燥切割方法的开发。在干切割中，需要高速主轴，可以在高速下实现较高的刚度，高精度和低功耗。在这项研究中，我们提出了一种新型的无限僵硬的静水轴承轴承，并具有微型的自控限制器，以实现上述轴承性能。在高速纺锤体的静水轴承中，通常采用低粘性润滑剂来避免增加轴承功耗的增加。因此，有必要研究低粘性润滑剂的拟议静水轴承的轴承特性。我们获得了以下结果。（1）。当采用粘度少于10 CST的润滑剂时，润滑剂的惯性效应对轴承特征受到很大的影响。（2）。润滑剂的惯性降低了静态刚度。（3）。即使使用低粘性润滑剂，提议的轴承也可以稳定运行。下一步，我们讨论了降低润滑剂惯性效应的新方法，因为这种作用会降低静态刚度。结果，发现通过使用多孔限制器而不是毛细管限制器，可以大大提高静态刚度。这是因为由于润滑剂的惯性作用，多孔限制器可以避免孔口效应，该孔口效应发生在毛细管限制器的入口处。我们使用多孔材料调查了使用自控限制器的静态和动态特性。此外，我们将此自控的限制器应用于静水杂志轴承，并在理论上和实验上研究了轴承的静态特征。因此，发现使用低粘性润滑剂具有自控限制剂的静水杂志轴承在达到高刚度，高精度和低功耗方面非常有效。