| Summary: | 碩士 === 義守大學 === 機械與自動化工程學系碩士班 === 97 === As the modern industry develops, the demands for precision, speed, and efficiency of high-technological and ultra-precise devices increases. However, the problems of friction and abrasion also exist in mechanic devices. Most of the problems are induced by the malfunction of the lubrication system, causing temperature rising or the exposure to the temperature difference of thermal expansion. Therefore, for mechanic devices, such as cams, piston rings, rolling element bearings, and during the stretching process of metal sheets, to be durable and precise, the lubrication of the machine is the most crucial technique.
In this experiment, the laser optical system is employed in the optical EHL, recording the dynamic characteristics of lubrication in the diminutive contact region using optical interferometry High-Speed video camera with the microscope. The variation of oil film thickness on the contact region is observed by the principle of optical interferometry and grayscale interferometry technique. Then, the variation is converted into graphics and diagrams for further analysis and discussion by using the software called Excel Grapher.
This research observes the variants of load, velocity, and temperature. The result suggests that even when the squeeze velocity is slow, the indentations of the two contacting devices still occur. Moreover, the central indentation oil film becomes thicker with increasing squeeze velocity. When sliding velocity is in
creases, the duration of central oil film becomes shorter; but when the squeeze load in creases, the oil film sustains longer. On the other hand, when temperature rises, the indenting central oil film becomes thinner because the viscosity of the dimple decreases and the oil flows faster. In conclusion, in the same squeeze velocity, load, and temperature, the highest central oil film thickness created by using HN lubricating oil of higher viscosity becomes much thicker than that is created using lubricating oil with less viscosity.
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