An investigation into the behaviour of selected boundary regime lubricants when cold forging steel under rolling-sliding conditions

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Abstract

A study of PVD coatings, solid-in-liquid suspensions, and an ashless phosphate ester in oil at the upper die- workpiece interface when cold rotational rotary forging martensitic steel. The aim was to gain tribological insight for advanced near net-shape process development. The test method was a cylinder upsetting operation using an industrial-scale press, and lubricants were applied via in-process spraying. Forming cycle torque requirements were lowest when water-based suspensions were employed. However, there was a positive correlation between friction and homogeneity of through-thickness deformation, and oil-based dispersions generated superior surface roughness. A tribological synergism occurred using MoS2 micro-platelets and an ashless phosphate ester mixed in mineral oil. This lubricant achieved higher quality surface finish and greater protection against adhesive wear than did each component dispersed separately.
Original languageEnglish
Article number106771
JournalTribology International
Volume157
Early online date26 Nov 2020
DOIs
Publication statusE-pub ahead of print - 26 Nov 2020

Keywords

  • metal forming antiwear/extreme pressure additives
  • wear resistant coating
  • solid lubricant
  • antiwear/extreme pressure additives

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