Optimization of the cold-rolling process to enhance service life of railway axles
| Autor: | S. Cervello, D. Regazzi, Stefano Foletti, S. Cantini |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Computer science
0211 other engineering and technologies Process (computing) Mechanical engineering 02 engineering and technology Residual Fatigue limit Axle 020303 mechanical engineering & transports 0203 mechanical engineering Machining Residual stress Line (geometry) Service life 021101 geological & geomatics engineering Earth-Surface Processes |
| Popis: | Over the last years, deep rolling has been adopted to improve the fatigue strength of railway axles. In particular, recent researches between PoliMi and LucchiniRS have shown the possibility to greatly enhance the residual lifetime of axles in presence of defects from running in service by inhibiting the propagation of cracks under normal loading conditions and retarding the appearance of corrosion-fatigue phenomena. Therefore, the new automatic machining line for axles setup by LucchiniRS includes a modern cold-rolling machine as a finishing process for premium quality axles. This paper is devoted to discuss the optimization of the cold-rolling process considering all the relevant parameters (load, roller radius, pitch) through a novel model able to simulate the build-up of residual stresses. The model was validated by comparing the residual stress path with the experimental outcomes, showing a good agreement for the various combination of the adopted parameters. The exploitation of the model will enable the designer to optimize the cold-rolling process taking advantage of the increase of fatigue properties in the definition of a safe life maintenance plan. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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