TEF-MET®/B is very similar to the standard TEF-MET® material. The big difference is that the backing material is bronze instead of steel.
The advantage is that once the PTFE sliding layer is worn off, the shaft will run on a bronze material instead of a steel. The friction between bronze and steel is a lot lower and the shaft will not be damaged as much as if it would run against the steel backing of a normal TEF-MET®.
The bearing is produced in a sintering line, where first the bronze powder is melted onto the backing material giving it a 20-30 µ thick rough surface. During the second step, the PTFE is melted onto the backing material and binding itself into the rough bronze powder surface. After the sintering process, the raw material plates are rolled according to the standard thickness. The next step will be to cut the raw material in the rectangular shape, which will be rolled into a rough cylinder. The last step will be to calibrate the rough cylinder by pressing them into a housing and pushing a suitable pin with the right tolerance through the bushings. This process will force the bushings into its complete round shape. As a finishing, the chamfers will be cut into the bushings.
TEF-MET/B bushings are manufactured according to DIN standard sizes, where the size of the outer diameter (OD) is correlated to the wall thickness and the inner diameter (ID).
The bushing can be considered as a higher quality standard TEF-MET® bushing due to its bronze backing. Not only that it has better sliding abilities once the PTFE layer is worn off, but the bronze backing is also non corrosive. This can be of an advantage in humid and offshore applications.
The smallest inner diameter for the TEF-MET® materials is 3mm and the largest we can produce is 400mm.
|Dynamic load:||≤ 140 N/mm²|
|Static load:||≤ 200 N/mm²|
|Sliding speed:||≤ 2,5 m/s|
|Fricition value:||0,02 - 0,20 µ|
|max. PV-value:||1,8 N/mm² x m/s|
|Temperature strain:||-200 up to +280 °C|
|Tolerance after mounting:||H9|
|Shaft tolerance:||f7 or f8|
|Shaft material:||Steel, hardened or untempered, roughness Rz < 2-3|