专业英语ppt.ppt

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1、LubricationMembers:张景帅张景帅 张良萌张良萌 张自信张自信 李淑磊李淑磊 左帅左帅 张重张重 一、一、Definition of lubrication二、二、Type of lubrication 三、三、Benefits of lubrication 定义：在两摩擦表面间加入润滑剂，形成润滑膜，而起到降低摩擦、减轻磨损和散热降温的作用-这种方法称为润滑。一、一、Definition of lubrication fluid lubrication solid lubrication fluid lubrication boundary lubrication mixtu

2、re lubrication按润滑材料分按润滑材料分 按摩擦状态分按摩擦状态分 二、二、Type of lubrication If the lubricating films pressure is supplied by an external source,the system is said to be lubricated hydrostatically.如果润滑膜的压力是由外源供给的，这种系统就如果润滑膜的压力是由外源供给的，这种系统就称为流体静压润滑称为流体静压润滑1 1 If the pressure between the surfaces is generated as a

3、 result of the shape and motion of the surefaces themselves,the system is hydrodynamically lubricated.如果滑动表面之间的压力是由于滑动面本身的如果滑动表面之间的压力是由于滑动面本身的形状和运动所共同产生的，这种系统就称为流体动形状和运动所共同产生的，这种系统就称为流体动压润滑压润滑2 2a.润滑：减少摩擦、降低磨损；b.冷却(cooling)：润滑剂在循环中将摩擦热带走，降低温度防止烧伤；c.洗涤：从摩擦面上洗净污秽，金属粉粒等异物；d.密封(sealing)：防止水分和其他杂物进入；e.防锈

4、蚀(corrode)：使金属表面与空气隔离开，防止氧化；f.减震卸荷：对往复运动机件有减震、缓冲、降低噪音的作用，压力润滑系统有使设备启动时卸荷和减少起动力矩的作用；g.传递动力：在液压系统中，油是传递动力的介质。三、三、Benefits of lubrication Friction control The amount and character of the lubricant made available to sliding surfaces have a profound effect upon the friction that is encountered.滑动面之间润滑剂的数

5、量和性质对所产生的摩擦力有极大的影响。have a effect upon 对有影响Temperature control Lubricants assist in controlling temperature by reducing friction and carrying off the heat that is generated.Effectiveness depends upon the amount of lubricant supplied,the ambient temperature,and the provision for external cooling.To a

6、lesser extent,the type of lubricant also affects surface temperature.润滑剂有助于通过减少摩擦和带走产生的热量来控制温度。有效性取决于润滑油的供给量、环境温度和外部冷却的规定。润滑剂的种类在较小程度上也影响表面温度。Wear controlWear control They reduce abrasiveabrasive and solid-to-solid contact wear by providing a film that increases the distance between the sliding surf

7、aces,thereby lessening the damage by abrasive contaminantscontaminants and surface asperities.润滑剂通过润滑膜来增加滑动面之间的距离，从而减轻磨料污染物和表面凹凸不平造成的损伤，因此减轻了磨蚀和由固体与固体之间接触造成的磨损。When machinery is in use,the lubricant controls corrosion by coating lubricated parts with a protective film that may contain additives to n

8、eutralize corrosive materials.当机器在使用时，润滑剂通过涂层保护润滑件来控制腐蚀，而保护膜可能含有添加剂来中和腐蚀性物质。coating 涂料，包衣 additives 添加剂 neutralize 抵消，中和.Corrosion prevention Lubricating grease frequently performs the special function of forming a seal retain lubricants or to exclude contaminantsGrease 润滑脂，黄油Contaminants 污染物，污垢物 润滑脂通常还有一个特殊作用，就是形成密封层以防止润滑剂外泄和污染物进入Sealing