Analyze the cause and solution of the failure of the linear sliding unit
Due to the quality and external conditions of the linear sliding unit during use, its bearing capacity, rotation accuracy and wear resistance will change. When its performance indicators are lower than the requirements for use and cannot work normally, the linear sliding unit will occur In case of failure or even failure, once the linear sliding unit fails and other unexpected situations, the machinery and equipment will stop, and various abnormal phenomena such as loss of function will occur. Therefore, it is necessary to find out the cause of the occurrence in a short period of time and take corresponding measures.
In order to maintain the proper performance and long-term use under good conditions, the linear sliding unit must be inspected and maintained. Inspection and maintenance are very important to prevent malfunctions. The rolling sound, vibration, and vibration must be checked during operation. Temperature and lubricant.
There are many reasons for the failure of linear sliding units in addition to normal fatigue peeling. Factors such as too small gap or poor lubrication caused by tight fit can leave special failure marks and failure modes. Therefore, inspection failure can be found most of the time. The reason for the failure is to take countermeasures in time. Generally speaking, 1/3 of the failure is because the bearing has reached the fatigue spalling period, which is a normal failure. 1/3 Premature failure due to poor lubrication of the linear sliding unit 1/3 Premature failure due to pollutants entering the bearing or incorrect installation. Generally speaking, there are the following seven common symptoms when operating abnormally. Overheating. Bearing noise is too large. Bearing life is too low. Vibration is too large. It does not meet the performance requirements of the machine. It is loose on the shaft. The shaft is difficult to rotate. The formation of seven common symptoms and typical causes. Grease. Lubricating oil expires or fails or is incorrectly selected. The sealing cap is twisted. The tightening sleeve is too tightly locked. The shaft is bent due to the unreasonable size of the shaft shoulder. The shaft shoulder rubs against the bearing seal cover. The rotating parts in the machine are in contact with the stationary parts. The grease is too full or the oil level is too high. The anti-loosening snap ring is in contact.
Incorrect installation method, hit the sliding unit directly with a hammer. The inner hole of the box is not round. The box is twisted and deformed. The supporting surface is not flat. The inner diameter of the bearing box hole is too small. The debris and other debris of the turntable bearing in the bearing box before the bearing is installed have not been cleaned up. The shaft and bearing housing are twisted. The bearing box hole is too large. The force is unbalanced. Shaft diameter is too small. The tightening sleeve is not locked enough. The contact oil seal is severely worn, causing lubricating oil leakage. Two or more of the same bearing is not good. The oil level is too low. There is insufficient grease in the bearing box. Because the material of the box hole is too soft, the hole diameter becomes larger after the force is applied, causing the outer ring to slip in the box hole. Water, acid, paint or other contaminants enter the bearing box. The oil seal has too much interference or the spring is too tight. The shaft and inner sleeve are twisted. The bearing clearance is too small. The diameter of the shaft is too large, causing serious expansion of the inner ring of the bearing, reducing the clearance. Sundries, sand particles, carbon powder or other pollutants enter the bearing box. The contact oil seal is severely worn, causing lubricating oil leakage. The area of the shoulder at the inner junction of the bearing box is too small, causing the outer ring of the bearing to be distorted. Two bearings are fixed on a shaft, and the bearing clearance becomes smaller due to the expansion of the shaft. Due to the effect of skidding (due to the rapid start. There are scratches on the rolling elements.