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如何判断轴承润滑脂在使用中失效

轴承润滑脂性能要求的指标很多,主要是胶体安定性(分油量)、机械安定性(10万次剪切试验,延长工作锥入度值)和氧化安定性,这3个指标综合结果,即是轴承寿命。
在轴承中运转的润滑脂遭受机械力的破坏使稠化剂的纤维变碎裂、变短、降低了维系润滑脂结构的能力,即稠度变化,如果稠度变化很大会产生从工作表面流失的现象,同时在运转工作时润滑脂将受到温度升高的影响,基础油会产生蒸发而减少或部分基础油由于脂的胶体破坏分油损失使脂的含油量减少,也有产生氧化变质的可能。
因此,对轴承润滑脂来说,若工作后脂内基础油含量低于60%-70%时(即基础油由于蒸发或分油而损失30%-40%)将降低甚至丧失润滑能力导致轴承运转失败,同时脂的稠度下降和氧化而变质更将影响运转中的轴承工作。
轴承的滚道声异常现象的维护
拉深模具材料的选用及热处理要求

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轴承润滑与维护
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