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Replacement method is the most common INA bearing has two kinds: one kind is the direct heating of bearing for acetylene and oxygen; another is the small bearings with oil heating, to expand, expand the inner diameter of the bearing, so that the assembly. These methods have been widely used in the long-term equipment repair, basically meet and solve the problem of the bearing assembly equipment repair. But these two kinds of methods to ensure the bearing heating area temperature is uniform in heating process, it is difficult to determine. Because the oxygen acetylene heating is the traditional single gas nozzle, and the heating process only by experience, the bearing temperature is heated to what degree appropriate difficult to master. The temperature is too high, will produce annealing of bearing, reduce the mechanical properties of bearing; the temperature is too low, the thermal expansion values is not enough, it is difficult to assemble. In equipment repair, repair workers sometimes because of insufficient heating of bearings, INA bearings mounted in correct position, may not have been forced to take down the heavy, thereby increasing the intensity of labor. Therefore, we propose a change from the traditional to the bearing.
1 electric heating instead of acetylene oxygen warmer. The plane furnace design becomes cylindrical furnace, named INA bearing electric heater, according to the inner diameter of the bearing different can be designed into bearing electric heater with different power and specifications (the best applicable scope in the above bearing diameter φ 300mm/). The heating device has the following advantages: heat radiation is uniform and stable, no dust bearing surface is heated, clean, clean, easy to measure and control the temperature of INA bearing
2 using the infrared thermometer to be heated INA bearing surface temperature monitoring. Heating of bearing assembly of general control in 100 ℃ - 120 ℃. In this temperature range, the thermal expansion values of maximum bearing steel, for INA bearing assembly, the temperature value and will not change the mechanical properties of bearing, and high reliability.
In summary, acetylene oxygen INA bearing electric heater is better than the traditional heating, is to improve the bearing assembly precision and work efficiency, effective method to reduce the labor intensity of the.
1 a method for improving the accuracy of INA bearing
A plant produced delicate instrument, spindle with 6202 / P2 type bearing and its accuracy can not meet the requirements, after the bold shaft neck and in its production to replace the inner ring raceway, and the steel ball for precision measurement, in size every three particle group, each group of steel ball and close to 120 DEG intervals to, due to adds a heavy machining surface, added a heavy with the surface, but also increased the INA axis and the bearing stiffness of the system, while the maximum three tablets with a minimum of three ball close to isometric spread, but also improve the precision rotary shaft, and meet the requirements of the precision of the instrument.
2 precision improving method
INA bearings installed in the host, such as the measurement of spindle radial runout, can be found in every round of measurements have some changes; continuous measurement, can be found after a certain speed, this change will be repeated approximation. A measure of the degree of this change index for cyclic rotation accuracy, change required to approximate repeats a few representative cycle of rotation accuracy of "cycle", in the quasi period quantity change of high amplitude, is the circular rotation accuracy is poor.
As for the spindle to be appropriate to pre load, the speed gradually declined to near compulsory speed, to implement INA bearing "break in" function, can improve the circulation of the spindle rotation precision.