tailieunhanh - Lubrication and Reliability Handbook 2010 Part 2

Tham khảo tài liệu 'lubrication and reliability handbook 2010 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A2 Mineral oils Table Types of additive oil required for various types of machinery Type of machinery Usual base oil type Usual additives Special requirements Food processing Medicinal white oil None Safety in case of ingestion Oil hydraulic Paraffinic down to about - 20 C naphthenic below Anti-oxidant Anti-rust Anti-wear Pour point depressant VI improver Anti-foam Minimum viscosity change with temperature minimum wear ofsteel steel Steam and gas turbines Paraffinic or naphthenic distillates Anti-oxidant Anti-rust Ready separation from water good oxidation stability Steam engine cylinders Unrefined or refined residual or high-viscosity distillates None or fatty oil Maintenance of oil film on hot surfaces resistance to washing away by wet steam Air compressor cylinders Paraffinic or naphthenic distillates Anti-oxidant Anti-rust Low deposit formation tendency Gears steel steel Paraffinic or naphthenic Anti-wear EP Anti-oxidant Anti-foam Pour point depressant Protections against abrasion and scuffing Gears steel bronze Paraffinic Oiliness Anti-oxidant Reduce friction temperature rise wear and oxidation Machine tool slideways Paraffinic or naphthenic Oiliness tackiness Maintains smooth sliding at very low speeds. Keeps film on vertical surfaces Hermetically sealed refrigerators Naphthenic None Good thermal stability miscibility with refrigerant low flow point Diesel engines Paraffinic or naphthenic Detergent Dispersant Anti-oxidant Acid neutraliser Anti-foam Anti-wear Corrosion inhibitor Vary with type of engine thus affecting additive combination LIFE h Figure Approximate life of well-refined mineral oils Courtesy Institution of Mechanical Engineers Selection of additive combinations Additives and oils are combined in various ways to provide the performance required. It must be emphasised however that indiscriminate mixing can produce undesired interactions . neutralisation of the effect of other additives corrosivity and the formation of insoluble .

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