Low noise sealed grease for imported bearings

1. General low noise motor imported bearing grease

In the imported bearing industry, this grease is the most widely used, accounting for about 70% of the total grease. Because this type of grease uses a soft, easy-to-filter lithium soap as a thickening agent, using mineral oil as a base oil, it is easy to meet the requirements of low and medium-grade imported bearings to reduce the vibration value. Another advantage is that it has good pumpability, whether it is mechanical fatliquoring or manual grease application. Moreover, the grease is inexpensive and can greatly reduce the cost of imported bearings. However, due to the use of mineral base oils, these greases have been compromised in terms of physical and chemical properties other than rust and rust resistance. If the bearing life can only reach 200 hours, the starting and running torque will be difficult to test at -20 °C. The grease is generally used at temperatures ranging from -20 to 120 ° C. When used at temperatures above 150 ° C, the base oil evaporates too quickly and the loss is severe, which greatly shortens the service life of the imported bearings.

2. Low temperature high speed imported bearing grease

At present, the equipment using precision imported bearings is becoming more and more refined, and the grease used for imported bearings must have the following properties:
(1) It has the same operating life as imported bearings, prolongs the maintenance cycle, shortens downtime and improves labor productivity.
(2) Under the high speed of dn>5×105, it is necessary to ensure that the motor temperature rises low and does not lick oil, thus reducing power consumption and protecting the motor.
(3) The impurity content is controlled under certain standards to minimize the pollution of equipment noise to the environment.
(4) Guarantee the flexibility of starting and running of imported bearings under ultra-low temperature working conditions to ensure minimum output power.
The foreign grease company selects high-purity chemical synthetic oil and some special additives to develop and produce low-temperature high-speed imported bearing grease in high-purity environment and equipment. The disadvantage of this kind of grease is that when it is used over 150 °C, its life decreases sharply with the increase of temperature, and the load and impact resistance are weak. It should be avoided on medium and large imported bearings to prevent boundary lubrication. Sintering occurs.

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Process requirements for long-life imported SKF angular contact ball bearings

When necessary, the user can propose to SKF bearing manufacturers process quality requirements that extend the life of SKF angular contact ball bearings, such as the stress state of the rolling surface and the control requirements of the processing metamorphic layer. Generally speaking, the rolling surface is in a state of moderate compressive stress, but it is also necessary to combine the surface change rate from grinding to superfinishing to determine the process parameters that are most favorable for the fatigue life of SKF angular contact ball bearings. In terms of aspects, it is advisable to obtain the cooperation of professionals related to SKF angular contact ball bearings.
The metamorphic layer of the rolling surface mainly refers to the surface layer which is different in physical and chemical properties from the base metal, such as the oxide layer, the work hardening layer and the tissue distortion layer. The strength of the rolling layer is often poor and the bonding with the substrate is not strong, and the SKF angle is not good. The contact life and wear life of the contact ball bearing are extremely unfavorable and should be controlled.
For high-precision SKF angular contact ball bearings, because the required roughness of the rolling surface is small, if the process is not appropriate, the high-gloss surface is not formed by cutting, but by the rubbing action of the abrasive grains, the surface must be The metamorphic layer formed by the plastic flow is actually disadvantageous to the life of the SKF angular contact ball bearing and should be controlled.

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