Rolling normal assembly, whether it is the axis or holes are generally interference fit. Interference fit assembly method, commonly used are: temperature difference method, the penetration method. In fact, in the mechanical assembly site, the temperature difference method with the less, the main operation is more complicated.

a: assembly of the temperature difference method than heating of the cooling method is simple, generally with liquid nitrogen, the advantage is that large temperature difference between linear expansion of a large amount of clean. Such as bearing mounted in the hole, TIMKEN bearing bubbles in liquid nitrogen. Heating is too much trouble. For uniform heating, general parts (bearing) into the liquid and cook. If you cook bearing, requiring relatively high. For example, the heating medium should be clean, temperature control, and so on.
   
The greatest disadvantage of the temperature difference method, the volume of parts restricted. Such as lathe spindle assembly, need to install the parts of the spindle and the shaft gear, the temperature difference method can not achieve.
b: indentation method most widely used. Will be able to get a hammer and a brass rod. Detail up, operation, there are still a lot of difference and precautions.
   
Mounted bearings to maximize the use of non-impact way. For example, with the press. Hammer percussion parts and bearing protection unfavorable. Of small size, small interference bearing, manual presses, such as a screw-type, you can, or even vise can.
   
Large size bearings, use hydraulic can. Install the bearings, beginning to pay attention to TIMKEN bearing is tilted, the need for timely adjustment of the location of the force, to prevent damage to the installation hole or shaft.
   
Of course, the preparatory work before the installation is also very important, such as cleaning parts mounting surface, remove the orifice, shaft burr. Clean the mounting surface coated with clean engine oil, and so on. The preparatory work must be careful. Burrs, dirt and other research into the assembly surface, the bearing assembly in place can not, followed by more downright, are often caught in the dilemma the point where even the entire axis or parts must be scrapped off.



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