plaquette MACHLINE - Ntn-snr.com
plaquette MACHLINE - Ntn-snr.com
plaquette MACHLINE - Ntn-snr.com
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- Coefficient a 3temp<br />
The operating temperature for bearing <strong>com</strong>ponents<br />
is given in the table below:<br />
Component Max. temp. Comment<br />
Rings 150°C -<br />
Balls<br />
- steel 150°C -<br />
- ceramic > 200°C -<br />
Cage<br />
- phenolic 100°C continuous<br />
resin 120°C peak temperature<br />
Standard<br />
- bronze 200°C On request<br />
- PEEK 120°C en continu<br />
On request<br />
150°C peak temperature<br />
Seals 100°C continuous -<br />
120°C peak temperature -<br />
Grease 120°C -<br />
For most machine tool spindle applications,<br />
coefficient a 3temp = 1 is used, as the operating<br />
temperature is well below 100°C.<br />
For other, more exposed applications, coefficient<br />
a 3temp can have the following values:<br />
Temperature<br />
a 3temp<br />
< 100°C 1<br />
110°C 0.96<br />
120°C 0.92<br />
130°C 0.88<br />
140°C 0.84<br />
150°C 0.8<br />
Infinite service life<br />
In the area of materials development, we can define<br />
conditions under which bearings can have an<br />
infinite service life:<br />
- Metal surfaces fully separated by a film of oil,<br />
giving a 3lub > 1.5.<br />
- Extremely limited oil film contamination, giving<br />
a 3pol = 1.<br />
- Load applied corresponds to Co/Po > 9, corresponding<br />
to Hertz pressure values lower than:<br />
2,000 MPa for 100Cr6, 2,300 MPa for XD15N.<br />
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