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Asperity
| Глоссарий терминов смазочных материалов |
Microscopic protrusion on a metal surface that typically occurs with normal finishing processes. ideally, lubrication should be sufficient to prevent asperities on each metal surface from protruding through the lubricant film and making contact with other metal surfaces.
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Microscopic, английский
- Observable only with the aid of a microscope.
- Objects or organisms that are too small to be seen with the naked eye.
Protrusion, английский
According to the tia, the fiber optic is either polished even with the endface or has a positive or negative protrusion, i.e., “sticks out” or is recessed
Lubrication, английский
- The control of friction and wear by the introduction of a friction-reducing film between moving surfaces in contact. the lubricant used can be a fluid, solid, or plastic substance.
- Смазка
- On no account should oil be used to lubricate pin-tumbler cylinders. graphite is the conventional lubricant for this mechanism.
- Смазка (действие)
- The act of injecting a fluid, normally bentonite and/or polymers, to reduce the skin friction and jacking forces on the jacking pipe during installation. the fluid fills the annular space.
- Means of reducing friction either around a pipe being jacked or a shaft being sunk into the ground.
- The control of friction and wear between two moving, touching surfaces by placing a friction-reducing substance between them.
- Control of friction and wear by the introduction of a friction reducing film between moving surfaces in contact. the film may be fluid, solid or plastic.
- Reduction of friction or wear between two load-bearing surfaces by the application of a lubricant; includes boundary lubrication (thin or interrupted fluid film, especially bearings where wear occurs); mixed film, where some liquid pools support the load; elastohydrodynamic (high-pressure loads increase the lubricant’s viscosity and load-carrying capacity, especially in gears); hydrodynamic (a thick fluid film lubrication, especially in journal bearings) and hydrostatic (external pump pressure used to form a thick fluid film, as in start-up of journal bearings).
Sufficient, английский
Достаточный
Asperities, английский
- Microscopic projections on metal surfaces resulting from normal surface-finishing processes. interference between opposing asperities in sliding or rolling applications is a source of friction, and can lead to metal welding and scoring. ideally, the lubricating film between two moving surfaces should be thicker than the combined height of the opposing asperities.
- Microscopic projections on metal surfaces, invisible to the naked eye, that creates peaks and valleys, even after grinding or machining. when two surfaces are in sliding contact, these imperfections cause interference that results in friction; without proper lubrication, wear, scoring or welding will follow.
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Auto-ignition temperature, английский
Minimum temperature at which a combustible fluid will burst into flame without the assistance of an extraneous ignition source. this temperature is typically several hundred degrees higher than the flash and fire point.
Hydro-treating, английский
In the process, lubricant feed stocks are reacted with hydrogen in the presence of a catalyst at very high temperature and pressure. the process displaces impurities and unsaturated hydrocarbons.
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