The lubrication mechanism in low speed plastic deformation with a synthetic lubricant — infiltration of lubricant into the boundary contact region

S. Kataoka, J. Kihara, T. Aizawa

Research output: Contribution to journalArticle


To investigate and evaluate the micro‐pool mechanism in a mixed lubrication regime using polybutene lubricants, experiments were performed using 1 mm brass sheet, for various surface rough nesses of a work piece and die, lubricant viscosities and extrusion speeds. Systematic study showed that (1) the lower viscosity lubricant is easily squeezed out from the micro‐pools into the flat are a through the troughs between the tool and work piece caused by plastic deformation of work piece, and (2) with decrease in lubricant viscosity and speed, or the larger the tool surface roughness becomes, the more lubricant infiltrates into the tool‐work piece interface, which reduces the actual friction coefficient.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalJournal of Synthetic Lubrication
Issue number1
Publication statusPublished - 1991 Apr



  • boundary
  • extrusion
  • low speed
  • plastic deformation
  • polybutene
  • surface roughness
  • viscosity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Surfaces, Coatings and Films

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