There are two common methods to replace INA Bearing: one is to directly heat INA Bearing with acetylene and oxygen; The other is to use oil Accuracy Of Ina Bearing immersion heating for small ina bearing to achieve thermal expansion and expand the inner diameter of INA Bearing for assembly.
These methods have been widely used in long-term equipment Accuracy Of Ina Bearing maintenance, and basically meet and solve the ina bearing assembly problem in equipment maintenance. However, these two methods are difficult to determine whether the temperature value of the heating area of ina bearing is uniform during heating.
Because the traditional acetylene oxygen heating is a single gas nozzle, and the heating process is only based on experience, it is difficult to master the appropriate temperature of the Accuracy Of Ina Bearing heated ina bearing. If the temperature is too high, it will anneal INA Bearing and reduce the mechanical properties of INA Bearing;
The temperature is too low and the thermal expansion value is not enough, so it is difficult to assemble. In equipment repair, the repairman sometimes cannot install the INA Bearing in the correct position due to insufficient heating of the INA Bearing, so he has to take it down and reinstall it, thus increasing the labor intensity. Therefore, we propose a new method to change the traditional heating assembly of INA Bearing.
The plane electric furnace is designed into a cylindrical electric furnace, named ina bearing electric heater. Ina bearing electric heaters with different powers and specifications can be Accuracy Of Ina Bearing designed according to different ina bearing inner diameters (the scope of application is in the inner diameter of INA Bearing) φ 300mm / above).
The heating device has the following advantages: uniform and stable heat radiation, no smoke and dust on the Accuracy Of Ina Bearing heated ina bearing surface, clean and easy to measure and control the ina bearing temperature.
The heating value of ina bearing assembly is generally controlled at 100 ℃ ~ 120 ℃. Within this Accuracy Of Ina Bearing temperature value, the thermal expansion value of INA Bearing Steel is large, which is convenient for ina bearing assembly. This temperature value will not change the mechanical properties of INA Bearing and has high reliability.
In conclusion, INA Bearing electric heater is better than traditional acetylene oxygen heating, which is an effective method to improve ina Accuracy Of Ina Bearing bearing assembly accuracy and work efficiency and reduce labor intensity. 1. A method to improve the accuracy of INA Bearing
An exquisite instrument was trial produced in a factory. The main shaft used 6202 / P2 INA Bearing, but its accuracy still could not meet the requirements. After that, the journal was thickened and a raceway was made on it to replace the inner ring, and the steel balls were accurately measured. Each group of steel balls was divided into three sizes, with an interval of nearly 120 ° for each group.
Due to the addition of a heavy machining surface and a heavy fitting surface, At the same time, the stiffness of the shaft and ina bearing system is improved, and the close isometric dispersion of large three grain and small three grain steel balls improves the rotation accuracy of the shaft, so it meets the accuracy requirements of the instrument.
After the ina bearing is installed in the main engine, if the radial runout of the main shaft is measured, it can be found that the measured value of each revolution has a certain change; During continuous measurement, it can be found that this change will approximately repeat after a certain number of revolutions.
The index to measure the degree of change is the cyclic rotation accuracy. The number of revolutions required for the approximate repetition of the change represents the “quasi period” of the cyclic rotation accuracy. The large magnitude change in the quasi period is the poor cyclic rotation accuracy.
If the spindle is properly preloaded and the speed is gradually reduced to close to the duty speed, so as to implement the “running in” function of INA Bearing, the cyclic rotation accuracy of the spindle can be improved.