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Timing view of bearings (6)
Source: China Bearing Network Time: 2014-03-31
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4. Selection of smooth grease When selecting smooth grease according to working temperature; the primary target should be dropping point; oxidation stability and low temperature function; dropping point can usually be used to evaluate high temperature function; bearing practice temperature should be lower than dropping point 10-20 °C The application temperature of the composition of smooth grease should be lower than the dropping point of 20-30 ° C.
When selecting smooth grease according to bearing load; for heavy load, choose smooth grease with small penetration. When working under high pressure, except for small penetration; also have higher oil film strength and extreme pressure function.
When selecting smooth grease according to environmental conditions; calcium-based smooth fat is not easily soluble in water; suitable for boring and less watery environments.
5, the oil is smooth under the conditions of high speed and high temperature; when the grease is smooth, it can be smoothed with oil. After smooth oil circulation; can take away a lot of heat. Viscosity is an important characteristic of smooth oil; the thickness of viscosity directly affects smooth oil The fluidity and the thickness of the oil film formed by the conflicting surface; the viscosity of the smooth oil at the bearing operating temperature is usually 12-15 cst. The higher the rotational speed, the lower the viscosity should be selected; the heavier the load, the higher the viscosity should be selected. The commonly used smooth oil has machinery. Oil, high speed mechanical oil, turbine oil, compacting oil, transformer oil, cylinder oil, etc.
The oil smoothing method includes:
a. Oil bath smooth oil bath smooth is the most common smooth method; suitable for the smoothness of low and medium speed bearings; part of the bearing is immersed in the groove; smooth oil is brought up by the rotating bearing parts; then it flows back to the oil groove. Below the middle of the lowest roll.
b. Drip oil smooth drip smooth is suitable for the quantitative supply of smooth oil bearing parts; the amount of oil is usually one drop every 3-8 seconds; too much oil will lead to increased bearing temperature.
c. The circulating oil is smooth and the oil is pumped to the bearing parts; the smooth oil after the bearing is filtered and cooled, and then used. Because the circulating oil can take away a certain amount of heat; the bearing is cooled; therefore, the method is suitable for bearings with higher speed. component.
d. The spray is smooth and mixed with smooth oil by a sprayer to form an oil mist; in the eruption bearing; the air flow can effectively cool the bearing and avoid the intrusion of impurities. This method is suitable for the smoothing of high-speed, high-temperature bearing components.
e. The illuminating and sliding oil pump pumps the high-pressure oil into the bearing through the nozzle; the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at a high speed; the rolling body and the cage also make the ambient air flow at a suitably high rotation speed. It is difficult to send the smooth oil to the bearing in a generally smooth manner; in this case, the smooth oil must be sprayed into the bearing by means of a high-pressure eruption; the nozzle should be placed between the inner ring and the middle of the cage.
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