Research Progress and Development Trend on the Localized Lubrication of Friction Surface

In response to calls for environmental protection and the economical use of resources, research into the application of small amounts of lubricant to achieve controlled lubrication of friction surfaces in a defined area has received increasing attention. This paper is based on the lubrication effect of fixed domain lubricant, from the formation mechanism of fixed domain lubrication, lubrication layer structure, lubrication type, lubrication effect and the correlation between fixed domain and micro-macro domain. This paper explores the formation mechanism, lubrication layer structure, lubrication type, lubrication effect and micro-macro domain correlation of fixed domain lubrication, analyses the performance of fixed domain lubrication in various aspects and its application, outlines the research progress on fixed domain lubrication at home and abroad in recent years, outlines different forms of fixed domain lubrication such as external force constrained, space closed constrained, surface morphology constrained and surface materialization constrained from the perspective of lubrication constraint, at the same time, the causes and lubrication mechanism are explained. The external force constraint type can achieve external control of lubrication effect; the space closed constraint type has mature technology, low cost, stable and widely used; the surface morphology constraint type forms a more accurate space of the fixed domain, does not affect the part outside the lubrication area. The surface materialisation constraint type has a good effect on the surface protection of the friction substrate, and is suitable for a variety of materials, and can reconfigure the molecular arrangement at the microscopic level, which has a broad research prospect. In this paper, the effect of coupling lubrication between different constraint types is investigated, and it is concluded that the effect of coupling between different fixed-domain factors can be influenced, and the effect of coupling between constraint types with similar effects can be significantly enhanced. The influence of single and multiple factors on lubrication performance and optimum parameters is demonstrated by analysing the corresponding experiments. In addition, this paper systematically illustrates the development overview of the research on fixed-domain lubrication in terms of mathematical model theory research, experimental research and simulation analysis, explores the influencing factors of fixed-domain lubrication from different research approaches, and analyses the lubrication effect of fixed-domain lubrication in friction processes and its advantages and shortcomings from practical applications, especially illustrates the coupling analysis of fixed-domain lubrication from macroscopic to microscopic levels, proposes the fixed-domain lubrication The analysis at the microscopic level points out that molecular arrangement and molecular forces also have some influence on fixed-domain lubrication; finally, the problems and feasible directions for expansion in the current research on fixed-domain lubrication are analysed, and suggestions for its focus on the coupling of multiple influencing factors are put forward. The study not only contributes to the study of the mechanism of fixed-domain lubrication, but also facilitates the expansion and improvement of the theory in the field of full-domain lubrication, which has a wide range of promising applications in reducing friction and wear and improving lubrication effect, and is of great help in reducing resource use and environmental pollution. © 2022, Chongqing Wujiu Periodicals Press. All rights reserved.