Fatigue strength of inner knurled interference fit joined by forming and cutting methods

The joining of machine parts by plastic forming is a common method for transmitting forces and torque. In drive trains, the ‘knurled interference fit’ has a high transmission capacity through the combination of frictional connection and form fit. In the present study, the shaft specimen made of C45...

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Bibliographic Details
Published in:Frattura ed integritá strutturale 2019-07, Vol.13 (49), p.429-434
Main Authors: Suchy, Lukas, Leidich, E., Hasse, A., Gerstmann, T., Awiszus, B.
Format: Article
Language:English
Subjects:
Case hardenability
Chamfering
Chromium manganese steels
Fatigue strength
Hardening rate
Heat treating
High-cycle fatigue testing
Interference
Interference fit
Inversed knurled interference fit
Joining by plastic forming
Machine tools
Notch fatigue
Powertrain
Process parameters
Steel
Strain hardening
Torque
Torque transmission
Torsional fatigue
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Summary:The joining of machine parts by plastic forming is a common method for transmitting forces and torque. In drive trains, the ‘knurled interference fit’ has a high transmission capacity through the combination of frictional connection and form fit. In the present study, the shaft specimen made of C45 steel material is joined with an inner knurled hub made of 16MnCr5 case hardened steel. The influence of the joining process parameters on the torsional fatigue strength of the shaft-hub connection is investigated by means of experimental studies. The most important parameter is the chamfer angle of the knurled hub, which determines the rate of strain hardening in the material and differs between the cutting and forming joining processes. This study shows that knurled interference fit connections joined by forming achieve a higher fatigue strength and a higher maximum static torque than connections joined by cutting.
ISSN:1971-8993
1971-8993
DOI:10.3221/IGF-ESIS.49.41