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Three Selection Criteria for the Cold Metal Forming Lubricating Oils Containing Extreme Pressure Agents by L Lazzarotto; L Dubar; A Dubois; P Ravassard; J Oudin is a Engineering article available to read on EtoBox.

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The performances of four commercial lubricating oils containing extreme pressure agents were investigated using the Upsetting Sliding Test (UST). This friction test takes account of the mechanical (contact pressure and sliding velocity) as well as the physical contact conditions (materials, roughness and temperature) which characterise cold forming processes such as drawing or extrusion. In this study the parameters of the UST are adjusted to simulate a forward extrusion process with a 75% reduction in the area. Three selection criteria are proposed: (a) the friction coefficient; (b) the occurrence of defects (scratches and cracks); and (c) the resulting roughness. It is shown that these criteria indicate the ability of the lubricant to reduce friction stresses, delay the forming limits, maintain boundary or mixed lubrication regimes and improve the surface finish.

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Author

L Lazzarotto; L Dubar; A Dubois; P Ravassard; J Oudin

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0924-0136)

Published

1998

Language

EN

Field

Engineering (Physical Sciences)