Distinguishing Bearing Quality: Common Methods
Bearing is an important component for modern machinery, and its performance has a direct impact on the entire machines normal operation and even the entire processing system. For example, when selecting a bearing used in a machine tool, not only must it satisfy the mechanical requirements of the bearing, but must also meet the special requirements of the machine tool. Therefore, it is necessary to identify the quality of the bearing accurately. The following are common methods used to distinguish the quality of a bearing.
1. Visual inspection
Visual inspection is a simple, fast and effective bearing quality recognition method. In contrast to other recognition methods, it is not affected by the material properties of the bearing and does not require complex equipment. Generally, the inspection should be carried out at the time of delivery and installation of the bearing, and include inspections of the external appearance, lubrication oil and lubricant marks, identification marks, inner and outer diameters, ring thickness, and cold fatigue. Visual inspections are also important in subsequent regular inspections as well as resolving any problems that occur during operation.
2. Static load test
Static load testing is a method commonly used to measure bearing quality. It is a method of using a static load to test the bearing to compare it with a bearing model. The static load test should be used in both radial and axial directions according to the dimensional accuracy, geometric accuracy of the bearing, the bearing cage has no defects and the strength of the bearing material. Generally, the test unit is set to a load of 20-30 times the rated load of the bearing, held for a specified period of time, and the test results are compared with the limit values specified in the bearing.
3. Dynamic load test
Dynamic load testing is a method for measuring bearing performance under dynamic working conditions. The dynamic load test not only can measure the dynamic tolerance of the bearing, but also can be used to test the service life of the bearing. The tests that are commonly used are chamber fatigue tests, which use a special testing device to rotate the bearing in a closed chamber and also add oil mist, dust, and oxygen to control the conditions of the bearings working environment. The test conditions simulate the actual operating conditions of the bearing and measure its service life.
4. Destructive test
Destructive testing is a destructive method of testing the bearing. It directly applies a large load to the bearing to measure its surface, internal and other properties caused by the load. It is usually used in combination with static load testing and dynamic load testing to observe the performance of the bearing under different load conditions. This method is more appropriate for newly developed bearing models that require testing under extreme conditions.
In conclusion, the quality test of bearings must be done correctly, and the quality of the bearing must be thoroughly controlled so as not to affect the normal use of the bearing. The above are the common methods for recognizing the quality of the bearing, and it is important to use them in combination to accurately identify the bearings quality.
