Core Tips: A: FAG bearing grease rheology: 1. When the grease is not affected by external force, it can maintain a certain shape like a solid, that is, it will not automatically lose when it is still. In receiving
One: FAG bearing grease rheology:
1. When the grease is not subjected to external force, it can maintain a certain shape like a solid, that is, it will not automatically lose when it is at rest.
2. In the case of extremely high shear stress (high shear rate), the grease flows like a Newtonian fluid, and the viscosity can be kept constant without changing with the shear rate.
3. When subjected to weak external force, it will produce elastic deformation; after removing the external force, it can return to its original position and shape, showing the elastic properties of the solid.
4. When the applied external force is large enough, the grease deforms and flows, so that it can no longer automatically return to its original position and shape. Therefore, the starting torque of the grease on the mechanical running parts is larger than that of the liquid lubricating oil.
Two: FAG bearing grease defects:
1. Grease is semi-solid and does not flow at room temperature, so it is difficult to grease or change grease on friction parts. FAG bearing cleaning is not very convenient.
2. The stirring resistance is large, so the heat generation is large and the cooling effect is poor. However, it should be noted here that this has a close relationship with the lubrication method. If the lubricating oil is lubricated with a fully immersed (or semi-immersed) oil bath, the grease will consume less power than the oil. For example, the British Journal of Friction and Lubrication reported in 1973, 6th issue: With a rolling FAG bearing with a diameter of 100, the speed is 1500r/min, and it is lubricated with grease. There are many examples of energy consumption in China, such as the refractory plant of Chongqing Iron and Steel Company. The motor power of the refractory tunnel kiln induced draft fan is grease compared to the N68 lubricant. The FAG bearing temperature is 4~6 °C lower.
3. The base oil is the carrier of the additive, and the additive does not function if the base oil fails.
4. Due to the mechanical action, the lubricating base filled in the FAG bearing configuration will gradually lose its lubricating properties. Therefore, the grease needs to be continuously replenished and updated. The interval between lubricant replenishment varies depending on the formation, size, and rotational speed of the FAG bearing, and the approximate interval of replenishment of the grease is required depending on the operation time.
Large metal noise
Reason 1: Abnormal load, countermeasures: Correct the fit, study bearing clearance, adjust and load, and correct the position of the housing shoulder.
Cause 2: Poor installation, countermeasures: Machining accuracy of shaft and outer casing, improvement of mounting accuracy, and installation method.
Cause 3: The lubricant is insufficient or unsuitable. Countermeasure: Replenish the lubricant and select the appropriate lubricant.
Cause 4: The rotating parts are in contact. Countermeasure: Modify the contact part of the curved path seal.
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