Potrebujeme váš súhlas na využitie jednotlivých dát, aby sa vám okrem iného mohli ukazovať informácie týkajúce sa vašich záujmov. Súhlas udelíte kliknutím na tlačidlo „OK“.
Standard Test Method for Permeability of Powder Metallurgy (PM) Bearings Using Nitrogen Gas (Withdrawn 2015)
Automaticky preložený názov:
Štandardná skúšobná metóda pre Priepustnosť práškovej metalurgie (PM) Ložiská použitie plynného dusíka
NORMA vydaná dňa 1.5.2010
Označenie normy: ASTM B966-10
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.5.2010
Kód tovaru: NS-8947
Počet strán: 4
Približná hmotnosť: 12 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
oil film, permeability, PM bearing, rotameter, self-lubricating, ICS Number Code 21.100.01 (Bearings in general)
Significance and Use | ||||||
In service, there is a space between a shaft and a self-lubricating PM bearing that contains an oil film when the bearing is operating properly. In the event the oil film is disrupted or fails to form the bearing will exhibit increased wear and possibly fail. Therefore the ability for oil to flow through the porosity of a PM bearing is critical to the performance of the bearing. The porosity of the bearing must be open to the surface and interconnected within the bearing. This allows the oil in a self-lubricating PM bearing to flow during operation to the space between the bearing and the shaft to form an oil film and protect the shaft from wear. The ability of a gas to flow through the bearing reflects the openness and interconnected properties of the porosity in the bearing. Data from this test can be used as an internal quality tool and can be reported to buyers of bearings. A number of other factors also affect the performance of the bearing and the movement of oil; factors such as the oil viscosity, operating temperature, load, shaft speed, surface area, surface finishes and others. This test provides information on only one property and cannot be the sole consideration in the design and testing of a bearing application. |
||||||
1. Scope | ||||||
1.1 This test method covers the determination of the permeability of a PM bearing when subjected to pressurized nitrogen under controlled conditions. 1.2 The values stated in SI units are to be regarded as the standard with the exception of flow rate for which the cm3/min unit is the industry standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
||||||
2. Referenced Documents | ||||||
|
Posledná aktualizácia: 2024-11-04 (Počet položiek: 2 209 323)
© Copyright 2024 NORMSERVIS s.r.o.