Theoretical foundations of frictional application of anti-wear coatings

   Finishing antifriction non-abrasive treatment (FANT) ensures increased wear resistance of restored friction surfaces. Enhancing the wear resistance and scoring resistance of the resulting coatings requires clarification and strict adherence to coating application modes, namely, the pressure of the rubbing tool on the surface being treated.

   The research objective is the theoretical determination and experimental verification of the required pressing pressure of the rubbing tool for frictional application of a high-quality anti-wear coating.

   Based on theoretical studies, the authors have developed a mathematical relationship to determine the necessary pressing pressure of the rubbing tool in the friction-chemical method of applying a high-quality anti-wear coating. Experimental results confirmed the theoretical calculations of the required application pressure of the rubbing tool in the anti-wear coating application zone, equal to 17.5 MPa, which is consistent with the results of other studies (10 to 20 MPa). Finishing antifriction non-abrasive treatment of crankshaft journals was carried out on a lathe at the following modes: anti-wear coating application speed – 0.25 m/s, required pressing pressure of the rubbing tool – 17 to 18 MPa, minimum number of working passes – 4. Two structural materials were used in the rubbing tool: brass L 63 GOST 15527-2004 and aluminum alloy AD-31 GOST 4782-97. A new technological fluid (medium) has been developed for the FANT process, the application modes have been optimized, and a new material (aluminum) has been used for the rubbing tools. The research results indicate the need to use additives containing chemical compounds of copper and aluminum to preserve the anti-wear and antifriction properties of the treated parts in the subsequent operation of automotive equipment.

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