Self-lubrication

Illustrated explanation

Cutting, permanent deformation and sliding response are distinct

3Self-lubrication
Cutting, permanent deformation and sliding response are distinctCallout 1 depicts chip removal by a cutting tool. Callout 2 compares an unloaded original specimen with one retaining permanent deformation. Callout 3 shows sliding contact and a possible transfer film, without predicting friction or wear. Current term: Self-lubrication, callout 3. 1 Cutting response Chip Tool · force · chips · surface finish 2 Permanent deformation Shape after load removal Ductility: capacity before fracture 3 Material-assisted sliding response Possible transfer film Contact pair and operating conditions Load · speed · temperature · moisture Follow actual lubrication instructions Conceptual contact; no friction or wear value
  1. Machinability

    Chip formation, tool wear, force and surface finish contribute to machinability under specified cutting conditions. The illustration does not establish thread quality or freedom from defects.

  2. Ductility / plasticity

    Permanent shape change illustrates plastic deformation. Ductility concerns how much plastic deformation can occur before fracture; neither property is elastic spring-back.

  3. Self-lubricationThis term

    Some polymer contacts can form a transfer film that changes friction and wear. This example does not mean that a nylon gland seal or thread can ignore its specified lubrication and torque instructions.

A tool removes a chip from a workpiece, a loaded metal sample retains a changed shape after unloading, and a polymer contact illustrates possible transfer-film formation during sliding.

Simplified manufacturing and contact examples. No cutting rate, ductility value, lubricant requirement or wear life is specified; each response depends on the material, processing and actual test conditions.

ReferencesISO 3002-1:1982 — Cutting-tool geometry and terminologyISO 6892-1:2019 — Metallic materials — Tensile testingISO 7148-2:2026 — Tribological behaviour of polymer-based bearing materialsISO 16047:2005 — Fasteners — Torque/clamp force testing