Abstract
Rotary cutting is recently focused because of its excellent machining performance by equalizing the distribution of wear and processing heat on the circle of cutting tools. Previous studies showed that nano-texturing manufactured on the cutting tool is one of promising ways to reduce friction coefficient between chip and tool. A lot of researches on the surface texturing to improve the tribological properties are found, but there is still room for investigation of the effectiveness of nano-texturing to improve the lubrication performance under elastohydrodynamic lubrication (EHL). This study investigated the effect of nano-texturing on oil film thickness and pressure distribution under EHL by using an experimental apparatus with optical interferometry. The experimental apparatus mainly consists of a steel ball and a sapphire glass disk, and they made point contacts during the test. Three kinds of spiral-grooved nano-texturings with various groove distance and depth were manufactured on the ball surface by using femtosecond laser. The load was 20 N and the rotational speed varied from 100 to 350 rpm. The experimental results showed that the oil film with nano-texturing became thicker 1.4-2.2 times than that without texturing, proving that spiral-grooved nano-texturing was also effective even under EHL condition.
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