ASTM B439-21

Standard Specification for Iron-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)



NORMA vydaná dňa 1.4.2021


Jazyk
Prevedenie
DostupnosťSKLADOM
Cena73.10 bez DPH
73.10

Informácie o norme:

Označenie normy: ASTM B439-21
Dátum vydania normy: 1.4.2021
Kód tovaru: NS-1023777
Počet strán: 14
Približná hmotnosť: 42 g (0.09 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM

Kategórie - podobné normy:

Kluzná ložiska

Anotácia textu normy ASTM B439-21 :

This specification covers the standard requirements for porous metallic sleeve, flange, thrust, and spherical iron-base bearings that are produced from mixed metal powder metallurgy technology and then impregnated with oil to supply operating lubrication. Porous iron-base bearings shall be produced by compaction of a mixture of elemental iron powder and copper, tin, pre-alloyed bronze or graphite powders and sintering in a furnace having a protective atmosphere at a specified time and temperature cycle. The interconnected or open porosity in the bearings shall be filled to the required volume either by an extended soaking in hot oil or preferably by a vacuum impregnation operation with lubricating oil which is a high-grade turbine oil with antifoaming additives and containing corrosion and oxidation inhibitors. Each of the iron-base bearing material shall conform to the chemical composition requirements for iron, carbon, graphite, copper, and tin as shall be determined by chemical analysis. The physical properties for each of the bearing material shall be within the prescribed wet density, oil content, and impregnation efficiency limits. The radial crushing strength and bearing breaking load of the oil-impregnated bearing material determined on a plain sleeve bearing or a test specimen prepared from a flange or spherical bearing shall also meet the minimum and maximum mechanical strength values.

Keywords:

bearing breaking load, impregnated density, interconnected porosity, oil content, oil-impregnated bearings, open porosity, PM bearings, porous metallic bearings, PV factor, PV limit, radial crushing strength, self-lubricating bearings,, ICS Number Code 21.100.10 (Plain bearings)

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