Bearings Assembly Quality Indicators Introduction
Bearings are found in a variety of applications in automobiles, computers, and other mechanical and electronic equipment. Their performance is an important factor in the quality and reliability of machines, and therefore their assembly quality is also very important. In order to ensure the quality of bearing assembly, it is necessary to determine the quality indicators before the assembly process. Generally speaking, the common indicators include dimensional accuracy, internal clearance, bearing characteristics, noise and vibration, appearance quality, lubrication system, and dynamic performance.
1. Dimensional Accuracy
As a key quality factor of bearing assembly, dimensional accuracy affects the installation, fit, and axial clearance of a bearing. The misalignment or excessive clearance of the inner ring and outer ring of a bearing during assembly may cause vibration, noise, and even severe bearing failures. Therefore, during the bearing assembly process, dimensions such as inner and outer diameters, overall length, and width must meet the expected tolerances.
2. Internal Clearance
Internal clearance is an important factor determining the loosening or frictional resistance of the bearing. If the internal clearance exceeds the domestic standard or the manufacturers technical conditions, it will cause noise and vibration, and even damage the bearing. Therefore, it is necessary to measure the internal clearance of the bearing before and after assembly to ensure that it meets the specified requirements.
3. Bearing Characteristics
The characteristics of a bearing are related to its ability to bear the load, maintain accuracy and good performance. Before assembly, it is necessary to measure and inspect the bearing characteristics such as radial inner and outer ring raceway diameter, rolling elements diameter, raceway and rolling element profile angle, and flushness and roundness.
4. Noise and vibration
Noise and vibration are indirect indicators of bearing quality. During assembly, if there is abnormal noise and vibration, it indicates that the bearing assembly is not correct, or even some assembly materials are unqualified. Therefore, it is necessary to measure and inspect the noise and vibration of the bearing before and after assembly, and find out the reason in time to avoid unexpected failures.
5. Appearance quality
The visual appearance of a bearing is one of the most important quality indicators. After assembly, the bearing should have no defects, no rust, no bumps, no scratches, no burrs and no staining. This indicator is a direct indication of whether the bearing has been correctly assembled and handled to maintain its quality.
6. Lubrication system
Bearings require lubrication to enhance the performance of a machine. During assembly, the lubrication system should be inspected to ensure that the lubricant is of the correct type, proper viscosity, and sufficient quantity. It is also important to ensure that the lubrication system has no leakage points.
7. Dynamic performance
Dynamic performance is the indicator to measure the performance of a bearing. After assembly, the dynamic performance of the bearing should be tested to ensure that the bearing can meet the requirements of normal use.
Conclusion
This article has described in detail the quality indicators of bearing assembly including dimensional accuracy, internal clearance, bearing characteristics, noise and vibration, appearance quality, lubrication system, and dynamic performance. It is necessary to determine these quality indicators before assembly, so that the quality of bearing assembly can be ensured to a certain extent.
