Standard Specification for Bronze-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)
NORMA vydaná dňa 1.4.2021
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Označenie normy: ASTM B438-21
Dátum vydania normy: 1.4.2021
Počet strán: 26
Približná hmotnosť: 78 g (0.17 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
This specification covers sintered bronze, oil-impregnated bearings made primarily from elemental copper, tin, lead, and graphite powders. This specification covers the following variables: Grades (available in three bronze base compositions identifiable by different graphite contents and one leaded bronze grade) and Type (Grades 1 and 2 are available in four types described by specific density ranges. Grade 3 is available in two types and Grade 4 is available in one type). Sintered bronze bearings shall be made by molding or briquetting metal powder mixtures to the proper density. The material shall conform to the required chemical composition for copper, tin, graphite, iron, lead, zinc, nickel, and antimony. The density of bearings supplied impregnated with lubricant shall be within the prescribed limits. Oil content of bearings shall not be less than the prescribed value for each grade and type of material. The material of different grades and types shall conform to the prescribed radial crushing strength requirements. An acceptance specification for the minimum bearing breaking load may be established for any specific standard oil-impregnated bearing. Chemical analysis shall be made for each representative sample of chips, which may be obtained by milling, drilling, filing, or crushing a bearing with clean dry tools without lubrication.
Keywords:
bearing breaking load, bronze bearings, 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 21.100.01 (Bearings in general)