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Bearing work in view and fault handling (2)
Source: China Bearing Network Time: 2013-01-17
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Viscosity is an important characteristic of smooth oil; the viscosity of the powder directly affects the fluidity of the smooth oil and the thickness of the oil film formed between the conflicting surfaces; the viscosity of the smooth oil at the working temperature of the bearing is usually 12-15 cst.
The higher the speed, the lower the viscosity should be selected; the heavier the load should choose the higher viscosity. The commonly used smooth oils are mechanical oil, high speed mechanical oil, turbine oil, compacting oil, transformer oil, cylinder oil and so on.
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.
(6) The solid is smooth under some special application conditions; a small amount of solid smoothing agent is involved in the smooth grease; if 3~5% of the No. 1 molybdenum disulfide can be used to reduce wear; improve the resistance to heat and heat; High vacuum, corrosion resistance, radiation resistance; and special conditions such as extremely low temperature; solid smoothing agent to participate in engineering plastics or powder metallurgy materials; can be made into bearing parts with self-smooth function; such as solid lubricant with adhesive Bonded to the raceway, cage and roll body; constitutes a smooth film; has a certain effect on reducing conflict and wear.
(7) Make up and replace a smoothing agent a. The smooth grease compensates for the interval because of the mechanical effect; the addition of aging and pollution; the smooth base filled in the bearing equipment will gradually lose its smooth function. Therefore, the smooth rank needs to be continuously compensated and updated. The composition, scale and speed of the bearing are different; the approximate interval of the smooth grease is compensated according to the demand of the working time. Others; when the bearing temperature exceeds 70 °C; the bearing temperature rises by 15 °C; Make up the interval to cut in half.
The double-sided closed bearing is now filled with grease when it is manufactured; “HRB†uses the standard smooth grease in these products; the common working temperature scale and other functions are suitable for the regular occasion; and the grease filling amount also corresponds to the bearing size. The life of the fat can usually exceed the bearing life; except for special occasions; no need to make up for smooth grease.
b. Smooth oil replacement cycle The replacement cycle of smooth oil is different depending on the application conditions and oil quantity; usually; when the working temperature is below 50 °C; when it is used in a good environment with less dust; once a year; when the oil temperature reaches At 100 ° C; replace it once every 3 months or less.
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