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Contact Bearing
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Ceramic ball bearing is a kind of bearing which has something different from other types of ball bearings. And in today's industries, there are more and more new categories of bearing products are developed to meet specific requirements.
Hybrid bearings are more and more commonly to be seen by us. One of the predominant applications for them is angular contact sets for high speed machine tool spindles. This application utilizes some of the key properties of the ceramic compared to steel: lower mass. The mass of it is about 40% of that of a steel ball of the same size. This means the hybrid ceramic bearing operates with less friction, less ball skidding, lower moment from gyro-spin, and therefore, lower operating temperature for a given speed, and higher limiting speed for a given size.
The hybrid ceramic ball bearing generally refers to a bearing assembly consisting of inner and outer rings of standard bearing steel, with silicon nitride ceramic balls. For some applications, the properties of the bearing with these balls offer functional improvements in several different areas over a conventional all-steel bearing. There are many properties of this kind of bearings.
First of all, this kind of bearing has higher stiffness. A hybrid ceramic design typically increases bearing stiffness by 15 to 20% compared to all-steel. This allows increased cutting accuracy, as the spindle deflects less under load. Overall vibration is also reduced.
Secondly, they hold potential benefits for a variety of bearing applications such as the smooth surface finish and high hardness. Bearing-grade ceramic balls are harder than bearing steel balls and have very good surface finish. Wear between the surfaces is reduced, and there is no cold welding between them and steel raceways under poor lube conditions. Therefore, the hybrid design generally requires less lubricant and is more forgiving of marginal lubrication than the all-steel design. The high hardness of the ceramic also makes them more resistant to surface-initiated damage from contaminant particles.
Thirdly, they have better corrosion resistance. The chemically inert ceramic balls will not corrode - a potentially important issue for bearing applications such as food machinery and medical tools.
The last but not the least one is that they have better electrical resistance. Ceramic balls are nonconductive, and therefore would prevent electrical pitting damage to bearings in electric motors or related equipment.
You can find more information on hybrid Ceramic ball bearing and Ceramic Ball.
How to Prevent Bearing Failure
When a bearing fails a whole analysis is conducted into why the bearing failed including the appearance of the bearing, cause of failure, and action of prevention. Here is a look at some of the most common causes of bearing failure and more importantly how we can go about preventing the failure from happening again.
Wear of the Bearing – wearing of the bearing is most often caused by inadequate lubrication. If there is not enough lubrication on the bearing or maybe the lubricant is lost for some reason then metal to metal contact is formed. This metal on metal action grinds on the bearing and deforms the bearing. If the lubricant is completely gone the temperature of the bearing will increase and this will then cause the bearing to fail as well due to overheating. To avoid this situation from happening check that the lubricant reaches the bearing at all times and re-lubricate more frequently.
True Brinelling – There is such a thing called False Brinelling as well but here we’ll look at True Brinelling. Brinelling occurs when the load that is placed on the bearing exceeds its limit. The bearing and the rings cannot hold the weight and make indentations in the metal in the raceways. This indentation and deformity means the bearing doesn’t roll as freely and so causes more vibration and more noise. Be aware of how much weight you can place on a particular machine, it will be specified either in the manual or on the side, and do not exceed the limit as this may result in bearing failure.
Bearing Damage Caused by Electric Currents – when an electric current is passed through a rotating or non-rotating bearing the temperature of the bearing increases, this will cause discolouration of the bearing. The bearing may melt in certain areas and re-hardened which causes small craters. To prevent the bearing from becoming damaged re-route the electricity path so it doesn’t touch the bearing or use insulated bearings which can handle high temperatures from the electricity.
Tight Fitting Bearings – when a bearing is very tightly fitted it can cause the bearing to fail, as with the reverse situation of a loose fitting, the fitting of the bearing needs to be exact for the bearing to work correctly. Because the bearing is so tightly fitted this will cause the bearing to increase in temperature which causes rapid wear and fatigue. To avoid this from happening ensure the bearings are fitted perfectly not too tight and not too loose.
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Bearing
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