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Tribological aspect of lubrication in form tapping of high‐strength steel
Author(s) -
Bierla A.,
Fromentin G.,
Martin JM.,
Le Mogne T.,
Genet N.
Publication year - 2008
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.62
Subject(s) - lubricant , lubrication , tapping , tribology , x ray photoelectron spectroscopy , materials science , metallurgy , composite material , forensic engineering , mechanical engineering , chemical engineering , engineering
This study aims at analysing the tribochemical mechanisms of lubrication during the process of form tapping and consequently optimising the formulation of the lubricant. In order to correlate the tribochemical reactions with the performance of a lubricant, we measure the alteration of the tapping torque according to the American Society for Testing and Materials D5619 standard. The objective of the study also relates to the identification of the additives and the association of their properties to the performance of the lubrication. The goal is to characterise the nature of the tribofilm created at the bottom of the threads, which is the zone that is most severely affected by the working tool. X‐ray photoelectron spectroscopy is used to characterise the surface of formed threads. This study demonstrates a link between the sulphur reactions on the metallic surface and the friction‐reducing performance of the lubricant during form tapping. Copyright © 2008 John Wiley & Sons, Ltd.