First, we must attach great importance to the importance of improving the bearing clearance rate
One of the main quality indicators for bearing matching is radial clearance. Radial clearance refers to the total clearance of the inner and outer ring channels and the rolling elements in the diameter direction.
Therefore, the bearing clearance is not only a major parameter for the qualification of the finished bearing after the qualified finished parts are matched, but also an important factor for the normal operation of the bearing. The clearance value does not meet the technical standards, which will affect the reasonable distribution of the load between the rolling elements. The rotation accuracy, vibration value and life of the bearing will be affected. Therefore, it is undoubtedly important to improve and guarantee the clearance rate of the bearing.
Second, analyze the causal relationship of the radial pass rate
In the process of product quality, once the problem is discovered, it is necessary to find the cause immediately. Using the form of causal analysis, we will analyze the low rate of radial clearance.
There are five major factors affecting the quality of bearing clearance. If materials and environmental factors are not considered for the time being, the influence of the testing instruments, process methods and personnel quality on the quality of the bearing clearance can be mainly analyzed. In the past, the matching method of the inner and outer rings of the bearing and the steel ball is to connect the inner and outer ring channels. The diameter deviation is sorted by the instrument, and a certain inner ring channel diameter size value and an outer ring channel diameter size value are calculated according to the standard clearance, and then the corresponding size copper ball is selected, and after the assembly, the shaft is assembled. Test the upper and lower limit values of the axial clearance to the clearance checker. If the technical requirements are not met, the three will be re-matched. As for the radial clearance value of the bearing, it is known by the axial clearance value, which is difficult to ensure accuracy. Because the measured axial clearance value is only the upper and lower limit values, and the upper and lower limit values are different due to the curvature of the channel and the method of each person, the radial qualification rate of the bearing selected by this method is adopted. It is unstable. When the time is high and the time is low, the number of rework is frequent, and the quality of the product cannot be confirmed.
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