The physical properties of smooth fat effect on mechanical wear

Wear and tear, refers to the relative motion dual appearance of moving pair work appearance material loss from time to time or residual deformation process. Wear process is mainly due to mechanical action between dual appearance, sometimes with chemistry. The mechanical action is usually refers to the effect of friction, and chemical action often refers to environmental medium and chemical corrosion. Smooth smooth smooth, fat fat membrane can reduce the wear and tear of the dual appearance and avoid corrosive substances to enter. Fracture is cause mechanical parts wear, aging and damage and failure of the three main reasons. As long as when wear beginning attack phase or slight wear of running-in ( Running-in) Lubrication may make appearance. So, a lot of machinery, such as car before put into normal operation to stop running in. Ordinary, said after the parts wear, often form mechanical precision loss and lower efficiency, therefore needs to change or stop the maintenance, forcing mechanical consumption reduced. In the mechanical work, every form of economic loss due to wear and tear is staggering. Some measure more than one-third of the world's energy, it is in the process of all kinds of mechanical transmission energy finally show the friction loss in various ways. Formed as a result of dual appearance damage, equipment damage, the demand for change is worn or damaged parts, so the total cost of the spare parts consumption and the amount of steel consumption, often can equal and host consumption required. In all kinds of smooth, including smooth fat agent, can greatly reduce the friction loss, reduce the wear and tear of spare parts and machinery to extend the using life, which can save energy and reduce the cost of steel. Appearance, the appearance is through the intuitive feel to smooth fat quality inspection of one of the most simple way. Such as color, transparency, and the average sex to visual; Such as the smell and can use nose to smell out; Such as smooth fat drawing fiber length, soft hard level, hands out impurities particle size available. Therefore, after the appearance of the quality of the inspection, can the preliminary judging smooth fat and identify smooth fat varieties. Sodium based grease is smooth fiber structure, for example, can pull a long silk, strong adhesion to metal outward appearance also. Second, the common use smooth fat drop point, is because it has not attached to the parts due to gravity erosion ability. Must know, at what temperature smooth fat will lose this ability. Smooth fat never active state to the active state, on the optical properties of the shift is not easy to use naked eye view to certain, therefore is smooth direct determination of fat never activity state into a state of temperature. This temperature is called drop point. This change of state is contain soap thickeners smooth fat characteristics of class, about the soap thickeners class smooth fat, may not have this state changes, but the precipitation of oil drop. Drop point no definite physical meaning, and its numerical owing to the different devices with different heating rates. From the determination of dropping point can understand roughly smooth fat category, composition and its use temperature approximation limit, etc. From the point of condensed soap, soap base smooth fat using ordinary temperature should be low 20 - drop point 30℃。 For example, smooth calcium base grease drop point is 75 - Temperature 95 ℃, its use is about 50 - 70℃。 Table 4 - 1 lists smooth grease temperature drop point and use ordinary relations, the warp and woof of the low temperature floor mainly depends on the selected oil. The nation standard GB/T4929 - 85 is smooth fat drop point measurement, and ISO/DP2176 equivalent. GB / T3498 - 83 is smooth and fat to find disease point measurement temperature range.