Bearing pressing the undervoltage reason analysis through the investigation and analysis, combined with the actual situation, I think that the cause of bearing press mounting pressing force are mainly in the following aspects: 1. Bearing matching is not serious, the amount of interference does not meet the requirements. As can be seen, resulting in bearing under pressure is mainly caused by excessive amount of surplus, and workers are not serious enough to choose the direct reason. 2 bearing less turnover, resulting in matching difficulties. I have an average of 125 units per day to press the bearing or so, but because of the limited bearing capacity, and overhaul bearing more, sometimes matching a bearing takes a long time. In order to improve the work efficiency, workers sometimes choose not seriously, resulting in the phenomenon of insufficient amount of surplus to occur, resulting in under pressure. 3 temperature is too low will cause bearing pressure under pressure.

As I press mounting space between the larger, at very low temperatures, even if the normal operation of the heating system, sometimes also can not guarantee axle neck and bearing isothermal 8 hours. The decrease of the temperature will cause the micro size of the shaft to be reduced, resulting in bearing matching difficulties, the high degree of shaft neck finish, resulting in less pressure. The high degree of shaft diameter, coupled with the coated bearing grease, the matching size of the approach to the limit, there will be insufficient pressure installed 1, resulting in bearing under pressure. The failure of the press will also cause the bearing under pressure.

Preventive measures 1 to strengthen the technical training of staff and workers, strict implementation of the bearing assembly matching process standards, to ensure that the matching diameter of the bearing and shaft neck diameter is in conformity with the technical requirements. 2 establish the bearing pressure loading and under pressure reporting system. Where the bearing under pressure is found to be in the first time to discharge and measurement, analysis of the causes of under pressure, and to develop the corresponding countermeasures. If it is caused by human factors, it is recommended to implement the necessary assessment mechanism. 3 increase the bearing capacity to ensure sufficient turnover of the bearing. 4 when the temperature is too low, to ensure the normal operation of the heating system. The pressing temperature must reach more than 10 DEG C, bearing and shaft diameter pressure must be installed before 8 hours at. If not in the store, two room temperature should not exceed 5 DEG C. 5 the implementation of inspection system, real-time monitoring of the technical state of the press, in a timely manner to repair the fault, to ensure that the bearing press fit and good performance.