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Influence of roughness on wear of thermoplastic on metal pairs: A preliminary analysis

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Sommario

Oggetto della presente nota è l'analisi preliminare della influenza della rugosità Ra sull'usura e sul coefficiente di attrito di coppie termoplastico-metallo.

I risultati ottenuti, evidenziando l'influenza della rugosità del provino di acciaio sull'usura, riconfermano che l'equazione di Archard per l'usura adesiva, che mette relazione il volume del materiale asportato da uno dei due provini con la durezza, il carico normale, il percorso di strisciamento ed il coefficiente di probabilità, è alquanto semplicistica. Infatti, come in precedenza era stato osservato che il coefficiente di probabilità varia col carico normale, ora se ne può concludere che dipende anche dalla rugosità superficiale del materiale più duro.

Dal poco soddisfacente adattamento dell'equazione di regressione ai punti sperimentali se ne può inoltre dedurre che, pur rimanendo indiscussa la sensibile influenza della rugosità superficiale del materiale più duro sull'usura, i parametri considerati non sono sufficienti a rappresentare il fenomeno nella sua complessità.

Al fine quindi di valutare in modo rigoroso l'influenza sulla usura dei diversi parametri connessi col fenomeno è stato deciso di proseguire lo studio procedendo all'impostazione di un piano sperimentale.

Una chiara ed esauriente valutazione degli effetti della rugosità superficiale sull'usura avrebbe indubbi riflessi pratici in quanto potrebbe indicare i limiti oltre i quali risulta antieconomico spingere la qualità delle lavorazioni meccaniche.

Summary

This work is a preliminary analysis of the influence of roughness on wear and on friction coefficient of thermoplastic on metal pairs.

The results confirm the influence of steel specimen roughness on wear and suggest the profitability of obtaining further information on this matter through planned experimentation.

The limits beyond which is not profitable to increase the quality of the mechanical machining could thus be ascertained.

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Authors and Affiliations

  1. Istituto di Costruzione di Macchine, Politecnico di Torino, Italy

    Margherita Clerico

  2. Istituto di Tecnologia Meccanica, Politecnico di Torino, Italy

    Sergio Rossetto

Authors
  1. Margherita Clerico
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  2. Sergio Rossetto
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Clerico, M., Rossetto, S. Influence of roughness on wear of thermoplastic on metal pairs: A preliminary analysis. Meccanica 8, 174–180 (1973). https://doi.org/10.1007/BF02128727

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