The Reason Of Sliding Bearing Holding Shaft

There are three kinds of friction states between sliding bearing and spindle: boundary friction, liquid friction and mixed friction.When the sliding bearing is in the boundary friction state, if the boundary oil film is destroyed, the direct friction and wear between metals (the first is abrasive wear) will increase sharply.At the same time, the local temperature generated by the metal friction increases sharply, which leads to the rapid expansion of the metal surface, which in turn intensifies the friction between metals.When the local high temperature generated by friction reaches the melting point of the material, the adhesion phenomenon will occur between the spindle and the uranium bearing, that is, holding the shaft.
Analysis of the reason of sliding bearing axle
1. There are impurities, dirt and poor oil cleanliness in the lubricating oil and sliding bearing oil pool.When the oil ring rotates with the spindle, the oil supply system begins to work.Impurities and dirt together with lubricating oil into the spindle and sliding bearing, the clearance between the spindle and sliding bearing is generally 0, 03-0. 04mm.When impurities and dirt drag the spindle or sliding bearing, non-liquid friction is easy to occur, resulting in shaft holding.

2. The lubrication system of the grinding head fails.Plain ground sliding bearings are lubricated by oil ring.This lubrication method has the advantages of simple, automatic, less oil consumption and so on.There are 16 5mm holes evenly distributed around the circumference of the oil ring.When the oil ring rotates with the spindle, the hole of the oil ring splashes the lubricating oil in the oil pool, the lubricating oil splashes on the spindle, and the spiral oil groove on the spindle inputs the lubricating oil into the spindle bearings.When the lubricating system of the grinding head does not supply oil or the oil supply is not stable, the phenomenon of holding the shaft will occur.
After axle locking occurs, the reasons can be found from several aspects:
1. Whether there is oil leakage at the grinding head.
2. Whether the oil pool is short of oil, and whether the oil level is lower than the indicated line on the oil label.Flat - grinding lubricants are mixed with kerosene
Kerosene is volatile.When the grinder is in normal use, the operator should always pay attention to the oil mark.When the lubricating oil in the grinding head is lower than the oil mark
The indicating line should be supplemented in time.
3. The radial clearance between the spindle and the sliding bearing is too small, the lubricating oil is not easy to input, and the temperature between the spindle and the sliding bearing rises too much
High, resulting in axle hugging.
4.The scraping method of sliding bearing is incorrect and the contact point does not meet the requirements.Sliding bearing scraping method is not correct, the contact point is not uniform or too many contact points will make the bearing oil film is unstable, the oil film stiffness is poor, if the grinding wheel is grinding, easy to produce axle holding.
Supplier:BMB bearings
BMB Bearings is the complete one-stop supplier of OEMs and wholesalers purchasing high-precision, miniature ball bearings, industrial ball bearing related products, as well as related professional services, including world-class engineering and design.BMB reminds you that when looking for the reasons for holding the shaft, you must not seize a point less than the rest, should be multi-perspective, all-round troubleshooting.