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该文简述了选用聚乙二醇作为水基冷却液润滑剂的原因和其润滑机理,并通过实验分别探讨了聚乙二醇在光学冷却液和机加工冷却液中的合理添加量.“,”The paper explains why to chose polyethylene glycol (PEG) as additive for water-base coolant and its lubrication mechanism and inquires into the proportion of PEG in optical coolant and metal cutting coolant.