Rolling mill bearings are often in high temperature, heavy load, strong impact, high speed working state operation, its working conditions are relatively worse than other rolling bearings, for bearings, lubrication is an important factor affecting its use effect, bearing grease can not only reduce friction resistance, but also reduce contact stress, vibration absorption, prevent rust and other effects. However, in the process of use, the bearing is often filled with grease during lubrication rolling mill bearings are often in the working state of high temperature, heavy load, strong impact, high speed operation, its working conditions are relatively worse than other rolling bearings, for bearings, lubrication is an important factor about its use effect, bearing grease can not only reduce friction resistance. Abnormal conditions caused by quantity occur from time to time, so it is particularly important to correctly control the amount of grease to improve the bearing life and reduce the occurrence of abnormal conditions.

Phenomenon 1: A: How is the bearing always high temperature recently, is it too little oil?

B: Why is the bearing always high temperature recently? Is it too much grease?

Uh uh uh....... This is really difficult to answer, because just look at the two questions and two answers, he is right!

But we still refer to the following, targeted comparison, I believe there is an answer.

The filling amount of grease

There are two main lubrication methods for rolling mill bearing grease:

1. One-time filling, mainly hot rod rolling or narrow strip rolling mill with a long service life, does not have online grease function after the bearing is run, and needs to be filled when the bearing is installed;

2, multiple filling, mainly the use of a long life of hot rolling rod or narrow strip mill after the transformation, to achieve the bearing can always be online refueling after running, mainly for grease leakage, supplement, can be filled in the bearing installation or installation after filling;

The filling amount of the primary grease is mainly based on the following:

1, according to the allowable limit speed of bearing grease n g and bearing actual speed n ratio to determine.

When n g/n < 1.25, it is recommended that the injection amount of grease account for 1/3 of all the space inside the bearing.

When 1.25 < n g/n < 5, it is recommended that the injection amount of grease account for 1/3- 2/3 of all the space inside the bearing.

When n g/n > 5, it is recommended that the injection amount of grease account for more than 2/3 of all the space inside the bearing.

2, according to the formula calculation

G=0.9(1/3˜2/3)[0.7854（D²-d²）HX10^-3-M/(7.8X10^-3)]

Where: G-- fat content g

D-- Bearing outer diameter mm

d-- Bearing inner diameter mm

H-- Bearing height mm

M-- Bearing weight Kg