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Skill Analysis: Selection of Smoothing Agents

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A. The smooth method of the grease-smooth and oil-smooth comparison bearing is roughly divided into two types: grease smoothness and oil smoothness. In order to give full play to the function of the bearing; it is important to use the conditions and application intentions;
B, grease smooth and smooth grease is a smoothing agent composed of base oil, thickener and additives. When selecting smooth grease; should choose smooth grease that is very suitable for bearing application conditions. Even the same kind of smooth grease; because the trademark is different There will be a big difference in functionality.
The smooth grease commonly used in bearings is calcium-based smooth fat, sodium-based smooth fat, calcium-sodium-based smooth fat, lithium-based smooth fat, aluminum-based smooth fat and molybdenum disulfide smooth grease.
The amount of smooth grease filled in the bearing; 1/2 to 1/3 of the inner space of the bearing is suitable. When the speed is high, it should be reduced to 1/3. Excessive smooth grease will increase the temperature rise.
C. Selection of smooth grease When selecting smooth grease according to operating 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 working environment with more moisture and moisture. Sodium-based smooth fat is easily soluble in water; suitable for boring and less watery environment.
D, the oil is smooth under the conditions of high speed and high temperature; the oil can be selected to be smooth. After the smooth oil circulation; can take away a lot of heat.
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 friction surfaces; the viscosity of the smooth oil at the bearing operating temperature is usually 12 to 15 cst. The higher the rotation speed, the lower the viscosity; The heavier should choose a higher viscosity. Commonly used smooth oils are mechanical oil, high speed mechanical oil, turbine oil, compacting oil, transformer oil, cylinder oil, etc.

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