Product Information
- Author
- Herausgeber FKM
- EAN
- 4250697512829
- Edition
- 1995
- Delivery time
- next business day
Untersuchung von Stählen und Oberflächenbehandlung im Hinblick auf ihre Eignung für Wälzlager in was
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Description
Untersuchung von Stählen und Oberflächenbehandlung im Hinblick auf ihre Eignung für Wälzlager in was
FKM 1995 Issue No. 201 Project No. 129
Abstract:
For reasons of fire and environmental protection, hydraulic fluids containing water are being used in more and more areas of technology. The aim of the research project was to select suitable bearing steels and surface protection processes in order to achieve a sufficient service life for bearings in aqueous fluids. Due to their water content, flame-retardant hydraulic fluids differ considerably from mineral oils in their lubrication behavior. Rolling bearings that are operated in such fluids are subjected to corrosive stress in addition to mechanical stress. This leads to a considerable reduction in the service life of rolling bearings made from standard steel1 00 Cr 6. In the research project, various rolling bearing steels and their surface treatments were investigated with regard to corrosion behavior and the failure and damage mechanisms under rolling stresses. In contrast to FV A research project no. 73, the service life tests were now carried out in the absence of air. The lubricants used were an HFA microemulsion with a water content of 98% and an HFC solution with a water content of 45%. The tests showed that corrosion-resistant rolling bearings using an HFC hydraulic fluid achieve high service life values. Due to the tribological properties of the HFC hydraulic fluids, bearings were operated in the transition from mixed friction to EHD lubrication. Under these conditions, a separating passive layer was able to separate the corrosive influence from the basic structure. The service life values that can be achieved under such conditions are limited by material fatigue. The deep groove ball bearings made from the corrosion-resistant steel Cronidur 30 exhibited even better fatigue behavior than the low-corrosion AISI440 C due to their microstructure. These results demonstrate the future potential of Cronidur 30 for rolling bearing technology. This work provides the designer with criteria for the design of rolling bearing arrangements in hydraulic fluids containing water.
Scope of report:
148 p. incl. tables and figures, 108 lit.
Start of work:
01.09.1990
End of work:
21.12.1994
Funding body:
BMWi I AIF-No. 7771
Research center:
Institute for Machine Elements, Design Engineering and Safety Technology University of Hanover Prof. Dr.-lng. Ernst-Günter Paland Welfengarten 1 A 30167 Hanover
Responsible:
Dipl.-lng. H. Werries
Chairman of the project:
Dr. rer. nato N. Geheeb, INA Wälzlager Schaetfler KG, Herzogenaurach
Chairman of the Advisory Board:
Prof. Dr.-lng. H. Kipphan Heidelberger Druckmaschinen AG. Heidelberg
Abstract:
For reasons of fire and environmental protection, hydraulic fluids containing water are being used in more and more areas of technology. The aim of the research project was to select suitable bearing steels and surface protection processes in order to achieve a sufficient service life for bearings in aqueous fluids. Due to their water content, flame-retardant hydraulic fluids differ considerably from mineral oils in their lubrication behavior. Rolling bearings that are operated in such fluids are subjected to corrosive stress in addition to mechanical stress. This leads to a considerable reduction in the service life of rolling bearings made from standard steel1 00 Cr 6. In the research project, various rolling bearing steels and their surface treatments were investigated with regard to corrosion behavior and the failure and damage mechanisms under rolling stresses. In contrast to FV A research project no. 73, the service life tests were now carried out in the absence of air. The lubricants used were an HFA microemulsion with a water content of 98% and an HFC solution with a water content of 45%. The tests showed that corrosion-resistant rolling bearings using an HFC hydraulic fluid achieve high service life values. Due to the tribological properties of the HFC hydraulic fluids, bearings were operated in the transition from mixed friction to EHD lubrication. Under these conditions, a separating passive layer was able to separate the corrosive influence from the basic structure. The service life values that can be achieved under such conditions are limited by material fatigue. The deep groove ball bearings made from the corrosion-resistant steel Cronidur 30 exhibited even better fatigue behavior than the low-corrosion AISI440 C due to their microstructure. These results demonstrate the future potential of Cronidur 30 for rolling bearing technology. This work provides the designer with criteria for the design of rolling bearing arrangements in hydraulic fluids containing water.
Scope of report:
148 p. incl. tables and figures, 108 lit.
Start of work:
01.09.1990
End of work:
21.12.1994
Funding body:
BMWi I AIF-No. 7771
Research center:
Institute for Machine Elements, Design Engineering and Safety Technology University of Hanover Prof. Dr.-lng. Ernst-Günter Paland Welfengarten 1 A 30167 Hanover
Responsible:
Dipl.-lng. H. Werries
Chairman of the project:
Dr. rer. nato N. Geheeb, INA Wälzlager Schaetfler KG, Herzogenaurach
Chairman of the Advisory Board:
Prof. Dr.-lng. H. Kipphan Heidelberger Druckmaschinen AG. Heidelberg
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