Progress and trend of minimum quantity lubrication (MQL): A comprehensive review

Based on the principle of different technical components, this study divides the research field of minimum quantity lubrication (MQL) technology (synergism technology, vegetable oil-based cutting fluid, oil mist control, MQL system, and process optimization) and comprehensively analyzes the relevant literature in different research fields. The contents include a review and summary of the characteristics of each field, an analysis of the advantages and development challenges in each field, and a description of the future development trends of MQL in each field. The analyses mentioned above are performed from the perspective of the promotion of sustainable processing and cleaner production. The objective is to achieve better cooling and lubrication effects, and reduce the adverse effects on the environment. The study also provides new research concepts for the future development of MQL technology.