Important factors in rupture of deep groove ball bearing cage

Rupture of deep groove ball bearing cage belongs to the occasional and non-normal failure mode, we should analysis the causes of IKO bearing cage fracture following the five aspects below.

1,deep groove ball bearing is poor lubrication: IKO bearings is running in a lean State, forming adhesive wear, and deterioration of the working surface. Tear matter produced by adhesive wear is easy to enter into the cage, so that cage is in abnormal loads, has the potential to cause rupture of cage.

2,creep phenomena of deep groove ball bearings: creep mostly means sliding phenomenon of finger rings, in case of insufficient interference combined with surface, the loading point moves around due to sliding, direction ring relative to the circular shaft or housing location deviation.

3,cage of deep groove ball bearing material defects: cracks, large blocks of metal inclusions and shrinkage cavity defects, bubble and riveting short nails or nails, pad in half cage surface voids, serious damage may cause, these all may cause cage fracture.

4,deep groove ball bearing cage is abnormal load: not installed in cretain place, tilt, and excessive interference,which easily caused tour gap reduced, increased friction and heat, surface softened, prematurely appeared exception peeling. As peeling extended, peeling foreign body entered into the frame hole, leading to the cage running block and producing attached load, increased cage wear. Such a deterioration in the loop, will may cause the cage fracture.

5,hard foreign body invasion: intrusion of foreign body exacerbates the cage wear and creat exception additional load, which can cause the cage fracture.

Selection of deep groove ball bearing grease on the importance of stability

1, rust-proof performance
Preferably, the anti-rust agent can be insoluble in water, with good adhesion, forming a layer of oil film on the steel surface.
2, mechanical stability
Insufficient mechanical stability of oil, during the operation, would make oil soap structure to mechanical disintegration, causing grease is destroyed, thus loss of lubrication.
3, oil seal
Oil seal is necessary barrier for the protection of deep groove ball bearings and lubricants from external contamination. TIMKEN bearings in operation, debris or moisture cannot penetrate TIMKEN bearings, to prevent damage to its case.
4, mixed greases
Do not mix incompatible greases. If two incompatible greases mixes, usually the consistency will become soft, lastly, it may cause  TIMKEN bearing damage because greases loss.
5, classification of oils
Consistency of grease and lubricating ability is affected by temperature. In an operation at a temperature of TIMKEN bearings  must select greases that have the correct grease consistency and good lubrication effect under the same temperature.

In the general case, fill volume of deep groove ball bearings grease , always exceeds the amount of directly involved in the practical needs of lubrication, cavity and bearing cover on and rolling the perimeter to form a contour. In this process, due to the extra grease resistance, bearing temperature rise quickly. Although most excess grease in the early running was out, and squeezing roller attachment grease is still likely to be between turning the rolling to the Raceway. The early stages, most of the grease is quickly (less than a minute) out of raceways, other grease with the bearing rolls loops. At the same time, the bearing temperature continued to rise, up until extra bearing grease is discharged,this may be called grease collection phase. According to TIMKEN quality and fill volume of grease in the bearings, this period can last a dozen minutes, or even hours.

After remaining bearing grease being discharged completely, leaving a small amount of grease on the contact surface in between rolling element and the Raceway, cage, and bearing goes into a normal stage. When temperature decreased gradually and reaches equilibrium. In other words, long-term lubrication, relies mainly on the film of grease to bear. In addition, the bearing in the long running process, outlines, as well as of the rolling element and the Raceway near to shrinking and ceding part of cage on the grease based oil, flow into the back between the Raceway and lubrication there is also a complementary role.

Bearing grease in the bearings of the different form the outline is not the same as the opening, be sure to form the outline draft, short journey times, long-term functioning of bearing temperature in low and stable, this is an ideal grease, particularly important for lubricating grease into drains.

Some so-called Eddy current type of grease is not, it is difficult to form contours, even forming contours tend to collapse, then rolled back over and over again the excess grease in the distance is strong mixing conditions, TIMKEN bearings, torque, temperature, and uneven, and may also generate noise, grease is also vulnerable to spoilage and wastage.

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Cleaning, maintenance and damage judgments for SKF deep groove ball bearings

1, bearing cleaning
When removing SKF deep groove ball bearings and repair, first record the bearing appearance,in order to confirm the residual amount of lubricant. After checking the lubricant used for sampling, wash bearings. Use ordinary gasoline, kerosene as a cleaning agent.

Bearing cleaning divided into rough cleaning and sperm washing. Respectively place on the bottom of the metal net in a container so that SKF deep groove ball bearings do not directly touch the dirt in container. When rough cleaning, if you rotate the bearing with dirt will damage bearing rolling surface, so you should notice. In cleaning crude oil, use the brush removing grease, adhesive, and then turn into sperm washing.

Sperm washing, is rotating side SKF deep groove ball bearings in cleaning oil while carefully cleaned. In addition, cleaning oil regularly to keep clean.

2, bearing maintenance and judgment
In order to determine if removed SKF deep groove ball bearings can be used, check after bearing washed clean. Carefully check the raceway surface, rolling surface, the status of the mating surfaces, cage wear, clearance increases and injury due to decline in accuracy, exception.

With separation bearing like SKF deep groove ball bearings, you can check outer ring raceway and rolling body respectively.

Larger bearings cannot be rotated with hands, note to check the rolling element and the Raceway, cage, flange surface appearance.

Whether the bearing can be used is depend on bearing damage, mechanical properties, and the operating conditions, and determined during the next maintenance. However, if have the following defects,SKF deep groove ball bearings can no longer be used, must be replaced:
(A) any cracks or gaps on inner ring, outer ring, rolling elements, cages;
(B) fracture on the rings or rolling elements;
(C) a significant wound on raceway surface, rib, rolling body;
(D) cages wear significantly, or rivets relaxation significantly;
(E) rust, wound on raceway surface or rolling body;
(F) serious creasing and marks on raceway surface or rolling element;
(G) clear the inner circle diameter or outer ring outside diameter surface creep;
(H) discoloration obviously due to thermal ;
(I) broken clearly of the seals or shields.