Causes and simple maintenance methods for heating of fag imported bearings

The fag bearing installation is skewed, which will cause the ball to not roll in the correct position of the bearing raceway, and even cause the axial force of the larger ball end face and the FAG inlet bearing inner race and the outer race stop, causing the bearing to overheat. If the bearing is not correct, it will take a lot of effort to check. The LY company's limestone crusher bearing heat is the case. The solution is to suck the dial indicator on the shaft. The needle is placed on the outer end of the fag bearing outer ring to check the end face jump. Generally, the end face runout value is controlled within 0.05. It is also possible to directly check the clearance on the left and right sides of the fag bearing with a feeler gauge.
The inner hole of the fag bearing and the shaft are matched by the base shaft and the outer ring of the bearing and the bearing housing hole are made by the base shaft. Generally, under normal load conditions, the shaft and the inner bearing of the fag bearing are matched by j5, js5, js6, k5, k6, m6, and the fag bearing seat hole and the bearing outer race are matched by j6 and j7. Rotating races, usually with an interference fit, can prevent the race from rolling and sliding on the shaft diameter and the mating surface of the bearing housing bore under load.
However, sometimes the measurement of the shaft diameter and the bearing housing hole is not accurate or the mating surface roughness does not meet the standard requirements, resulting in an excessive interference fit, which causes the bearing race to be greatly squeezed, resulting in the radial direction of the fag bearing itself. The reduction of the gap makes the fag bearing difficult to rotate, generates heat, and the wear is intensified or stuck. In severe cases, the inner and outer races of the bearing are cracked during installation. The non-rotating seat often adopts a gap or a small interference, so that the rotation of the seat may cause a slight creep, and the contact surface of the race with the rolling element is continuously replaced, and the raceway of the race is evenly worn. At the same time, it is also possible to eliminate the axial jam of the rolling elements in the fag bearing due to the thermal elongation of the shaft. However, excessive clearance will cause the non-rotating seat to rotate with the rolling elements, causing severe wear on the shaft (or bearing seat hole) and the inner race (or outer race), and friction will cause the fag bearing to heat and vibrate. .
1. The rolling bearing has low precision. Solution: Select a fag bearing with the specified accuracy level.

2. The spindle is bent or the hole of the box is not concentric. Solution: Repair the spindle or cabinet.

3. The belt is too tight. Solution: Adjust the belt to make it elastic.

4. Poor lubrication. Solution: Use the lubrication information of the specified grade and clean it properly.

5. The assembly quality is low. Solution: Improve assembly quality.

6, rolling fag bearing inner casing running circle. Solution: Replace the rolling fag bearing and related wear parts to correct the balance hole diameter of the impeller and verify the static balance value.

7, the axial force is too large. Solution: cleaning and adjusting the gap of the sealing ring is required to be between 0.20.3mm.

8. The rolling bearing is damaged. Solution: Replace the rolling fag bearing.