Lubrication in forming

In this issue, we continue our presentation of lubrication problems in forming processes. In the first two parts, we presented the general principles of lubrication, followed by the rules to be observed when choosing the right lubricant for the right process, and finally the means of testing, which is essential for determining the performance of a lubricant in terms of friction and tool wear. In this section, we analyze the lubrication regime using thick films (micrometer thickness) formed from :

• cold, thanks to the viscosity of liquid lubricants and the consistency of solid lubricants (metal soaps, metal coatings);

• hot viscosity of metallic glass coatings.

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 regime.

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

References are given in the "Further information" section: [Doc. M 3 017] .