Study On Preparation And Tribological Properties Of Dimple-Texture On The Steel Surface

Rational design and fabrication of surface structure in friction pairs will effectively enhance the pairs'frictional, lubricating and wear-resistant properties. This paper, based on extensive literature documentations, the rational experimental program design and numerical analysis combination, mainly in order to discuss on the following key issues: the fabrication and characterization of friction pairs as well as frictional and lubricating properties.First, this paper designed a self-adapted holder, which can make fixed samples swing in any direction, can keep friction pairs full contact and adapt the change of the contacting surface in the process of sliding friction. Compared with the ordinary holder, it showed test data become more stable and repeatable. This can exactly reflect the original surface state between friction pairs and make the data more accurate. What's more, this helps the following research on how friction pairs'surface structure effect friction and wear properties.Second, this paper discussed two simple and practical methods to fabricate surface structure. One is surface dimple-textured by pellet-pressing, which is a convenient and economical way of getting millimeter or sub-millimeter scale dimple-textured surface structure , and another is surface texturing by sandblast, which is a convenient and economical way of getting micron or submicron scale irregular surface structure which had no fixed geometry but a certain roughness. These two methods are economical, practical and easy-operated so that they can be promoted to industrial applications after deep research on their geometric representation and influence to frictional and lubricating properties.Third, this paper fabricated four kinds of laser surface structures. Protuberance surface structure and concave surface structure were prepared by common laser respectively. Using ultrafast laser we can also find periodic corrugated structure and micro-mastoid, submicron-pits and short corrugated multi-scale composite structure. With metallographic microstructures gradient distribution complex structure, protuberance surface structure had excellent tribology, wear and wettability properties. Concave surface structure could get excellent tribology and lubrication properties when the Hersey number is bigger.Finally, this paper simulated how different micro-pit parameters under test conditions affect the load capacity. Simulation results which are basically consistent with experimental results show that there is an optimum depth to diameter ratio that is 0.025.In this paper, there are 88 figures, 12 tables, 14 formulas and 150 reference articles.