During the use of ore milling plant, many users find that their ore milling plant will produce bearing heating. Some heating phenomena occur in the initial running in period and return to normal after running for a period of time; Others last for a long time and have a great impact on production. Today, we mainly introduce the causes of heating of ore milling plant bearing.Ore milling plant is a heavy-duty equipment. It is started with heavy load. During operation, the load is heavy and there is impact load. Therefore, special attention should be paid to two aspects when selecting rolling bearings:(1) Load selection of bearing. If the selected bearing has low rated load and serious bearing wear during operation, it will cause bearing heating and shorten service life.(2) Selection of bearing clearance. Too small clearance is not conducive to the formation of oil film and the elimination of thermal expansion. Especially when the ambient temperature is high, too small original radial clearance will make the clearance of the bearing smaller or even zero due to the expansion of temperature rise during operation, which is easy to cause bearing heating.