2, large machinery can not be manually rotated, so immediately after the start of the no-load, the power is cut off, the machine idling, check for vibration, noise, whether the rotating parts are in contact, etc., to confirm that there is no abnormality, enter the power running. The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there are abnormal sounds, changes in the temperature of the SKF bearing, leakage or discoloration of the lubricant, and the like. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.
SKF bearing temperature can generally be estimated based on the external temperature of the housing. However, it is more accurate to directly measure the temperature of the outer ring of the bearing by using the oil hole. The bearing temperature gradually rises from the start of the operation, and the temperature is usually stable after 1 to 2 hours. If the bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, and the like. In the case of high-speed rotation, the selection of SKF bearing structure and lubrication method is also the cause.
The rotation sound of SKF bearings is checked with a stethoscope, etc., and there are strong metal noise, abnormal sounds, irregular sounds, etc. to explain abnormalities. The reasons are poor lubrication, poor accuracy of the shaft or housing, bearing damage, and foreign matter intrusion.
From the two aspects of the reasons for use and internal factors, the reasons for the effectiveness of SKF bearings, the main factors are whether our use is reasonable, the internal factors are actually the level of our choice of bearings! !
The use factors mainly refer to whether the installation adjustment, use and maintenance, maintenance and repair, etc. meet the technical requirements. Installation conditions are one of the primary factors in the use of factors. SKF bearings are often improperly installed, resulting in changes in the force state between the various parts of the bearing, and the bearings operate in an abnormal state and fail early. According to the technical requirements of SKF bearing installation, use, maintenance and maintenance, monitor and check the load, speed, working temperature, vibration, noise and lubrication conditions of the bearing in operation, find out the cause and immediately adjust the cause, make adjustment It returned to normal. In addition, it is important to analyze the quality of the grease and the surrounding medium and atmosphere.
The internal factors mainly refer to the three major factors that determine the quality of SKF bearings, such as structural design, manufacturing process and material quality. First of all, the structural design is reasonable and advanced, so that it will have a long bearing life. Bearings are generally manufactured through multiple processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. The heat treatment and grinding processes that affect the quality of the finished bearing often have a more direct relationship with the failure of the bearing. In recent years, research on the metamorphic layer of bearing working surface shows that the grinding process is closely related to the bearing surface quality.
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