Article | REF: M3018 V1

Lubrication in forming

Author: Éric FELDER

Publication date: December 10, 2008, Review date: August 24, 2021

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ABSTRACT

This article describes the mechanical characteristics of the pockets-plateaus scheme, where lubricant pockets of significant thickness- in the micrometer range- coexist along the interface and extremely thin films, some tens of nanometers thick, can be found on the complementary part of the apparent contact area . This article then proceeds to presenting the characteristics of these thin films produced by the chemical reactivity of the lubricant additives.

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AUTHOR

  • Éric FELDER: Ingénieur Civil des Mines de Paris - Doctor of Science - Maître de Recherches Groupe Surfaces et Tribologie CEMEF (Centre de Mise en Forme des Matériaux) UMR 7635 CNRS – École des Mines de Paris

 INTRODUCTION

This dossier should be read in conjunction with [M 3 017] , which describes the thick film lubrication regime. In this section, we describe, from a mechanical point of view, the characteristics of the pocket-plate (mixed) regime, where :

  • pockets of lubricant of significant thickness (in the micrometer range);

  • and on the complementary part of the apparent contact area of very thin films (thickness of the order of a few tens of nanometers).

Next, we describe the characteristics of these thin films generated by the chemical reactivity of lubricant additives.

This presentation consists of four files:

  • [M 3 015] General principles and selection

  • [M 3 016] Friction and wear: characterization

  • [M 3 017] Thick film lubrication system

  • [M 3 018] Mixed lubrication speed

Most of the symbols used in this text were introduced at [M 3 015] . Readers are referred to their own table of symbols.

References are given in the "Further information" section: [Doc. M 3 018] .

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Forming lubrication