In general, conventional bearings work at temperatures up to 150 °C. Under these conditions, it is possible to guarantee its performance, even if special care is required. Mainly with lubrication. However, there are certain applications that have high temperatures. That’s where high-temperature bearing comes into play.
The bearings for extreme temperatures are designed to meet the same applications in wide temperature fluctuations.
Above all, to reduce machine operating costs, extend maintenance intervals and provide a high degree of operational reliability.
If you are looking for a bearing that can withstand high temperatures (330 or 350 °C), see now what options are available in the SKF catalogue.
SKF high temperature bearings and bearing units
The SKF bearings are considered the best and most reliable in the market. They follow strict standards and quality control in their manufacture. Furthermore, they are developed with raw materials that allow them to achieve a longer useful life.
The SKF range of high temperature bearings and bearing units includes:
- Deep groove ball bearings
- Y bearings (insertion bearings)
- bearing units
- SKF DryLube bearing
The SKF can provide other bearings for extreme temperatures that meet the needs of a specific application. However, for this, it is necessary to contact our application engineering team.
Check out the high temperature bearing options now and see which one is ideal for your application.
Deep groove ball bearings for high temperature
The hard SKF ball bearings for high temperatures have the same standard size of stiff bearing of a career conventional spheres.
Although they have no entry slots, they can accommodate normal axial loads in addition to radial loads.
Radial internal clearance is a multiple of C5. This prevents the bearings from sticking, even if they cool down quickly.
The bearing surfaces for high temperature and protective plates are made of manganese phosphate . This increases the lubricant’s adhesion to the metal and provides additional corrosion protection.
SKF high temperature deep groove ball bearings are available in variations:
Extreme temperature ranges for deep groove ball bearings and Y-bearings
The ZZ bearings VA201 and VA208 have a protective plate on both sides. Also known as the 2Z suffix.
However, VA201 high temperature bearings operating below 200 °C. At speeds below 25% of the limit speed they need a break-in procedure. That is, the bearings must be heated to 200 °C for at least 48 hours. To do this, use the inductive heater tool for bearings .
However, if you expect higher speeds, consider using SKF DryLube bearings. Talk to our team for these cases.
Y bearings for high temperatures
With the exception of the cage and seals , SKF Y-bearings for high temperatures correspond to Y-bearings with standard threaded bolts of the YAR 2-2F series.
This bearing has a shield plate and a deflector on both sides. This prevents solid contaminants from entering the bearing.
All bearing surfaces, in addition to the protective plates and deflectors, are also made of manganese phosphate. Likewise, it increases the lubricant’s adhesion to the metal and provides additional corrosion protection.
SKF Y-bearings for extreme temperatures are available in variations VA201 and VA228.
How is a high temperature bearing serviced?
For the lubrication of the high-temperature bearing , first of all you have to see what type of sealing plate it has.
If it is protective plate on both sides, it does not have a relubrication location. Especially since they are lubricated at the factory for the life of the bearing.
The open deep groove ball bearing model VA201 should be inspected after approximately six months of operation.
To do this, simply open the bearing or, in the case of oven cars, remove the wheel with the trunnion bearing and remove the contaminants.
Observe whether the lubricating film forms a shiny metallic trail on the bearing race.
If not, the bearing must be lubricated again. Use original SKF high temperature grease .
However, before relubricating, the bearing must be carefully cleaned. Do not rotate bearings while drying with compressed air.
What are the advantages of using an SKF high temperature bearing?
SKF high temperature bearings offer:
- Reduced total operating cost through increased bearing life;
- Relubrication free operation;
- Fewer number of automatic lubricating points;
- Low consumption of lubricants in the machine;
- Optimised lubrication plans;
- Reduced environmental impact;
- Excellent performance in hot, dry environments and applications with low rotation speeds;
Why use bearings for extreme temperatures?
First, there is the operational advantage. Well, it is designed to have a longer service life. This represents savings in maintenance costs.
Second, lubricant savings. As some models are factory lubricated and do not need to be relubricated.
Third, and not least, it contributes to a lower environmental impact. Since it will offer greater energy efficiency . In other words, companies can reduce the energy consumption of the equipment’s rotating system.
For companies that embrace environmental commitments and sustainability programs like ESG , the high temperature bearing will meet several requirements.
What are the main applications of bearings for high temperatures?
When thinking about industrial applications, the high temperature bearing has a wide range of applications.
From the metallurgy industry, oven cars, cooling beds for steel plates, to the food and beverage industry, such as baking and biscuit preparation ovens.
Main temperature problems that a bearing can suffer
Bearings operating in high temperature applications suffer from a number of factors that can reduce their service life.
The most common problems are:
At high temperatures, grease or lubricating oil forms a very thin film. Very thin oil, in combination with low rotational speeds, results in metal-to-metal contact in the bearing parts. This will cause wear, increased noise and excessive play.
Reduced grease life
Grease ages quickly at high temperatures. This results in more frequent relubrication. In addition to being time-consuming and expensive, the operator can forget or even neglect to do it later.
The excess grease also creates the potential for overloading the bearing. Above all, increase the risk of contaminating the process and even catching fire.
Also, the old grease that remains in the bearings can char at high temperatures and block the bearings.
Loss of internal clearance in the bearing
When temperatures rise above the bearing stabilisation temperature, thermal expansion and structural material changes in the bearing will occur.
This can lead to uncontrolled loss of radial internal clearance and ultimately locked bearings.
SKF bearings for high temperature is at Abecom!
We present in a little more detail the main information about SKF bearings for high temperatures.
Based on this, you can now have a better understanding of how important it is to choose a bearing with guaranteed quality. To buy your high temperature bearing, just contact us and request your quote.
ABECOM is the largest SKF distributor in Brazil and has a specialised technical team to provide all technical support.
In addition, we are specialised in predictive maintenance services that enable you to reduce your maintenance costs. Discover our solutions!