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Installation method of printing machine bearing Shanghai giant Bearing Co., Ltd. 2020-04-13 08:05:17

How to install the bearing of printing machine?
The pressure should be directly applied to the ends of the tightly matched rings, and the pressure should not be passed through the roller body. Usually, the following methods are used:
When the outer ring of the bearing is tightly matched with the hole of the bearing seat, the bearing can be pressed into the first hole of the bearing seat when the inner ring and the shaft are loosened. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole.  
If the bearing rings and shaft are closely matched with the seat holes, the installation of the inner ring and outer ring must be pressed into the shaft and the hole at the same time. The structure of the assembly sleeve should be able to simultaneously press the end face of the bearing inner ring and outer ring.  
1. Heating fit
By heating the bearing or bearing box, thermal expansion is used to convert tight fit into loose fit installation.
This is a common and labor-saving installation method.
This method is suitable for installing bearings with greater interference. Before hot assembly, the bearing or detachable bearing ring is put into the tank and heated uniformly at 80-100 degrees, then removed from the oil and installed on the shaft as soon as possible.
In order to prevent the end face and shaft shoulder of the inner ring from tightening after cooling, axial bearing can be tightened after cooling.
When the outer ring of the bearing is tightly matched with the bearing seat made of light metal, the thermal assembly method of heating the bearing seat can be used to prevent the surface of the joint from being scratched.  
When heating the bearing with oil tank, there should be a grid at a certain distance at the bottom of the tank, or a hook will be used to hang the bearing. Bearings must not be placed on the bottom of the storage tank to prevent sunken impurities from entering the bearings or heating them unevenly. There must be a thermometer in the tank.
Strictly control the oil temperature should not exceed 100 degrees C to prevent tempering and reduce the hardness of the rings.  
2. Installation of thrust bearings
The matching of the circumference and the shaft of the thrust bearing is usually a transitional fit. The matching of the seat ring and the bearing hole is usually a clearance fit, so the bearing is easier to install.
Open the shaft.  
The installation method of bearings is usually the rotation of the shaft, so the match between the inner ring and the shaft is win-win, and the coordination between the outer ring and the bearing chamber is a clearance fit.  
1 bearing preparation
Because the bearing is rusty and packaged, do not open the package before installation.
Besides, the antirust oil coated on the bearings has good lubrication performance. For general bearings or grease filled bearings, they can be cleaned without cleaning.
But for instrument bearings or bearings for high speed rotation, clean rust proof oil should be used to wash out rust preventive oil. At this point, the bearing is easy to rust and can not be placed for long.  
Inspection of 2 axle and bearing block
Clean bearings and shells and ensure no scratches or burrs left by machining.
SiC, Al2O3 and other molding sand and cutting chips must not be found in the shell.  
Secondly, check the size, shape and machining quality of shaft and shell.
Before installing the bearing, the mechanical oil is smeared on each mating surface of the shaft and the outer casing.  
Usually, the shaft is rotated, so the inner ring and outer ring can be fitted by interference fit and clearance fit respectively. When the outer ring rotates, the outer ring adopts interference fit.  
1 press in installation
Press in installation usually uses pressure.
The power machine can also use bolts and nuts, and can use hammer to install them as the last choice.  
2 heat jacket installation
The sleeve is used to heat the bearing into the oil so that it expands. Then it is installed on the shaft to prevent the shaft from being subjected to unnecessary external forces and to complete the installation operation in a short time.
3. Heating considerations:
1 the general heating temperature should not exceed 100 degrees Celsius.  
2 the bearing shall not be allowed to touch the bottom of the oil groove.  
In addition, the hot sleeve installation can also use induction heating device to heat the bearing to make it expand and then install it on the shaft.