Gluing is a phenomenon in which metal on one surface adheres to another surface. The main reason for this is the lack of oil, insufficient lubrication under grease shortage, and heavy load, high speed, and high temperature, where the rolling element and the raceway are in contact with the local high temperature metal welding phenomenon. Generally, light gluing is also called scratches, and heavy gluing is also called burning bearings. Gluing is a serious failure, which will cause a sharp increase in vibration and noise immediately after it occurs, and in most cases it is difficult for the equipment to continue to operate.