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Establishment of lubrication diagnostic technique with ultrasonic method

超声法润滑诊断技术的建立

基本信息

批准号：
13650157
负责人：
TAKEUCHI Akitoshi
金额：
$ 1.28万
依托单位：
INSTITUTlON Kochi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650157/
关键词：
Tribology Ultrasonic Inspection Rolling Bearing Lubrication Diagnosis Bearing Life Bearing Damage Bearing Degradation

项目摘要

An ultrasonic technique is applied for detection of abnormalities in a ball bearing in its life test. Ultrasonic wave pulses are entered into a bearing housing from a piezoelectric vibrator attached to the outside of the housing. Those pulses are partially reflected from the interface between the housing and the outer ring of the bearing. Because of the different acoustic impedance between the solid-to-solid contact and the contact with an intervening gas or liquid layer, the intensity of the echo depends on the real contact area formed at the interface, and it can be used as a measure of the local contact pressure. When determined in the loading zone ofthe bearing which is running in a normal condition, the intensity of the filtered echo pulses produces smooth, nearly sinusoidal peaks corresponding to passages of the balls. However, invasion of a solid particle like wear debris to the rolling surface between a ball and either of the raceways causes a sudden rise of the local contact pressure, while a flaw formed on their rolling surface causes its sudden drop. The experimental results show these "events" are detected by the ultrasonic technique, and, further, a simple sum of the intensity or of the time duration of those events over a certain period starts to increase when the cumulative number of revolution reaches, typically, 80% of the total bearing life. This indicates the possibility of the early detection of abnormalities in ball bearings which lead to fatigue failure due to surface-originated cracks.

介绍了一种超声技术在球轴承寿命试验中的应用。超声波脉冲从安装在轴承壳体外部的压电振子进入轴承壳体。这些脉冲部分地从轴承座和轴承外圈之间的界面反射。由于固体-固体接触和与中间气体或液体层的接触之间的不同声阻抗，回波的强度取决于在界面处形成的真实的接触面积，并且它可以用作局部接触压力的量度。当在正常运行的轴承的负载区域中确定时，滤波后的回波脉冲的强度产生与滚珠通过相对应的平滑的、接近正弦的峰值。然而，固体颗粒如磨损碎屑侵入滚珠和任一滚道之间的滚动表面导致局部接触压力突然上升，而在其滚动表面上形成的缺陷导致其突然下降。实验结果表明，这些“事件”检测的超声波技术，而且，此外，一个简单的总和的强度或持续时间的这些事件在一定时期内开始增加时，累计转数达到，通常，80%的轴承总寿命。这表明了早期检测球轴承异常的可能性，这些异常导致由于表面裂纹引起的疲劳失效。