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Terminology


Terms Commentary
AAMA

American Automobile Manufacturers Association

Cavitation

This is a phenomenon of phase change into gas phase thereby creating cavity in the liquid due to depressurization. Although it is similar to boiling, in which a gaseous phase results from heating, it is distinguished by whether pressure or heat is used. There are situations in which the vapor is filled in the cavity and dissolved gas of the liquid is discharged and filling up the cavity, which are referred to as vapor cavitation and gaseous cavitation, respectively. In the case of mineral oil, solubility increases with a drop in vapor pressure, thereby easily resulting in gaseous cavitation for lubricant, while vapor cavitation is limited to bearings subjected to intense variable load

Clay Treatment

Purification method for the purposes of decolorization, deodorization, and stability improvement by using acid clay and activated clay as absorption agent

Flame retardant hydraulic pressure

The ability of the material to undergo plastic deformation; that is, if the material is not destroyed even when there is deformation due to external forces, such material is deemed to have complete plasticity

Forging

Refers to deformation of metal while in the state of having plasticity. Generally, processing methods of rolling and drawing are not considered forging.

Hydrolysis

Refers to organic compounds disintegrating through reaction with water. If hydrolytic stability is poor, hydrolysis products are not dissolved in oil, but become separated, resulting in corrosion. Ester range synthetic oil, metallic soap, or ester range lubrication additives are rather unstable.

Infrared Absorption Spectrometry

Analytic method utilizing the absorption spectrum of substances as displayed in the IR ray range. The spectrum reflects the chemical structure of the molecule and is used widely in structural analysis of compounds. In addition, it is possible to execute quantitative analysis by using the characteristic absorption strength. It is used widely for analysis of lubricants, grease, and additives.

Plasticity

The ability of the material to undergo plastic deformation; that is, if the material is not destroyed even when there is deformation due to external forces, such material is deemed to have complete plasticity.

Precipitation Number

10 ml of the specimen is centrifuged with 90 ml of naphtha for sedimentation under prescribed conditions with the resultant volume of precipitate indicated in milliliters. This indicates the quantity of the insoluble portion and impurities.

Rolling

Processing method for manufacturing of plates, rods, various shaped metals, and pipes by passing various metal materials through rotating rolls of various shapes within a hot or cold environment.

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