Lubrication in forming

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] .