The causes and the harm of grease dry harden

Grease dry harden reason and harm - 2020 10 - 12 points caused by grease oil dry and harden, if this process occurred in the process of the operation of the machine parts, such as bearings, gears, internal will have adverse consequences for the normal operation of them, as the grease dry harden and growing friction, bearing temperature, and the rise in temperature, in turn, adding grease dry speed. In most cases, severe dry grease is the result of joint action of many factors, to start with the main cause of dry grease. Grease dry reason: 1, the grease contamination: dust, dirt, dust and impurities, like this kind of impurities can cause dry grease. Incompatibility between 2, grease: if accidentally mixed grease can also make grease colloid structure destroyed, accelerate the oil. One of the typical example is the organic bentonite and grease soap base grease. 3, high-temperature volatilization: using low viscosity base oil in the grease of the most volatile. When the temperature rises to a certain height, the base oil from the inside of the thickener overflow, grease is gradually hardening ( / thickener base oil content decreases, the ratio of base oil viscosity increase) 。 Oxidizing: 4, base oil base oil after oxidizing looks like asphalt, grease will happen the same oxidation process. At room temperature, into the metal abrasive dust (of the grease Containing copper (ii)) Cause oxidation of grease. Copper accelerated oxidation grease base oil, grease thicken harden. Overheating: 5, machine parts such as bearings charging excessive grease caused by overheating, mechanical conditions ( Improper installation, the heavy load, etc. ) , lack of lubrication can cause the overheating of the machine running, among them, the excessive grease is a common cause of filling. When the machine running at high temperature, achieve the dropping point of lubricating grease, oil began to precipitate, gradually lose grease base oil began to dry out, the final failure, grease machine also will be a problem. 6, base oil by mechanical force extrusion: some rolling bearing is easy to cause oil problem, such as spherical roller bearing. In the bearing and gear of rolling shear, grease base oil quickly separated from the thickener, the whole process is like the water absorption was dry sponge, some thickener can absorb the oil back, while others cannot, such as composite aluminum soap have good resilience, when the pressure to reduce, base oil can quickly return to the thickener. 7, hydrostatic extrusion: under the effect of constant pressure, the hydrostatic can also cause grease oil. Ways to deal with are: using special thickener, polarity of the base oil, viscosity index improver, reinforced adhesion agent, increase the concentration of the thickener. 8, vibration and centrifugal force: the grease if long time of vibration or centrifugal force role also exacerbate oil. Such as coupling, without appropriate use of grease, in a short period of time coupling can put grease base oil dry. What is the harm dry grease? After grease dry, can cause jams, cause poor lubrication system, the machine running overheating, increase mechanical parts lubrication friction resistance, increase the consumption of mechanical power. Once dry cause jams, grease thickener will be stuck in the machine, base oil loss. In centralized lubrication system, grease dry jams are more likely to occur in the oil pump and the pipeline between the injection nozzle. In order to prevent grease hard congestion, it is very important to the choice of the grease, good quality low grease oil distributing trend, in Angola qualitative good mechanical shear process, in addition to pay attention to keep the flow velocity of the grease, enough to prevent grease is static, because will produce oil and plug. Some grease thickener fiber is longer, such as sodium based grease, it is easier to meet this problem. By the method of standardized testing, the grease of liquidity and pumping test, can rule out prone to problem of grease. Let the grease in the flow state can also help to prevent clogging. Some users have hardened ( Or thicken) Grease base oil is added to dilute, make fat consistency decreases ( The tender) After use, users should not be using this method, due to the lack of necessary homogenization processing, grease colloid stability will become worse. Open barrels after taking the product, do not leave the hole in the drum shape, should be get fat after sample surface smooth, prevent depressions, or base oil will be squeezed by natural gravity and infiltration of pits left by sampling, and affect the quality of the products.