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- Oil between the moving component ball
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Ointments are regularly the main driver of disappointment when round and hollow moving bearing framework's temperatures rise.A typical inquiry upkeep work force asks bearing organizations when their gear temperature is high or rises is: What is the most extreme temperature that the course can deal with? The better thing to ask is: What is the most extreme temperature that the bearing framework can deal with?At the point when contemplating temperatures it is vital to think regarding a complete tube shaped moving bearing framework.A complete round and hollow moving bearing framework incorporates a moving bearing, an ointment, and much of the time a greasing up framework. The oil of ball and roller direction is expert with oils, oils, or dry strong movies [graphite, molybdenum disulfide (MoS2), polytetrafluoroethylene (PTFE), oil impregnated polymer oil, and so on. Moving course convey the heap of pivoting gear, yet cannot work for long without an ointment. In the event that the grease falls flat the bearing will fizzle presently. Greases are regularly the main driver of disappointment when a course framework's temperature rises.This article is intended to offer support staff some assistance with thinking of most extreme temperatures that a direction framework can continue under use, instead of consider temperatures in connection to just a course and just the ointment and grease framework.The steel utilized as a part of tube shaped moving bearing, both through solidified and case carburized steels, is prepared to a base hardness of Rockwell C 60. As per the American Bearing Manufactures Association (ABMA) the most extreme working temperature of through solidified steels, AISI 52100 is 16O0C (32O0F), 440-C is 18O0C (3560F), and M50 is 32O0C (60O0F). All in all for all steels, as the temperature surpasses 20O0C (3920F) the hardness starts to diminish. In this way, the moving bearing life diminishes as temperatures rise past 20O0C (3920F).As any metal warms up a material stage change tilting pad bearing happens and the measurements get to be sliding bearing insecure. At the end of the day the bearing parts extend.Since the most well-known strategy to gauge the temperature of a course is by perusing the temperature on the outside of lodging, recollect that the temperature at the bearing surface is 10 to 15 F lower than bearing temperature.Tube shaped moving bearing can't work dependably without a grease. The moving bearing framework incorporates a moving bearing, great grease, and a greasing up framework. The oil of ball and roller direction is proficient with oils, oils, or dry strong movies. At the point when a machine's temperature rises, the fundamental sympathy toward upkeep work force ought not to be the most extreme reasonable temperature the round and hollow moving bearing can suit. The primary concern ought to be the most extreme temperature the whole bearing framework can deal with. The primary center ought to be on the greatest temperature that the ointment and/or the greasing up framework can persevere in light of the fact that their disappointment will bring about the bearing to fall flat. An ointment's disappointment because of a high temperature is hard to identify. In this manner, it is critical to screen the temperature of an ointment.Without a decent supply of oil a round and hollow moving bearing will fall flat before its potential life (LlO life) because of rubbing and wear between the moving component and the raceways. Oil between the moving component (ball, circular roller, tube shaped roller, and so forth.) and the raceway lessens contact and wear, and along these lines diminished warmth era.Oil can be supplied to the bearing either specifically or using oil. Oils used to grease up a moving bearing incorporate base oil and in some cases added substances. Oils are comprised of base oil (65-95%), thickener (3-30%), and added substances (0-15%). In some cases up to 5% of strong oil is added to oil. It is the base oil in oil that takes the necessary steps in an orientation framework, not the thickener, nor the added substances. A thickener holds the oil and the added substances enhance the properties of the thickener. The oil takes the necessary steps for the moving bearing, the thickener keeps the oil set up, and the added substance can upgrade the execution of the oil and/or thickener.Whether oil or oil is utilized to grease up a barrel shaped moving bearing, both can just continue such a great amount of warmth before they lose their viability in the bearing framework.The sort and measure of thickening specialists utilized (natural, inorganic, metal cleanser) and the base oil sort (mineral or engineered oil) and its consistency decide the upper and lower working temperature points of confinement of greasing up oils.Something else to consider with high temperatures in a round and hollow moving bearing is the oil's thickness Viscosity is the measure of the relative resistance of a liquid to stream at a given temperature: the higher the consistency, the more noteworthy its imperviousness to stream. Consistency is measured either in centistokes (CST) or Saybolt Universal Seconas (SUS). With oils the consistency number is the stream rate of the base oil, not the thickener.A consistency of grease ought to be adequate to isolated parts under working conditions, yet not all that high that additional drag is made. As the temperature rises the consistency of oils brings down. The higher the temperature, the higher the consistency required in a heading framework.By and large in high temperature applications, if the oil or oil utilized has a lower thickness, the bearing framework will come up short rashly as can be normal, for the most part in a high temperature application a higher consistency oil or oil ought to be utilized.

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  Blog créé le 12-10-2017 à 04h58 | Mis à jour le 12-10-2017 à 05h24 | Note : Pas de note