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hydrodynamic lubrication

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003194
EISBN: 978-1-62708-199-3
... machining, electrical discharge machining, chemical machining, abrasive jet machining, laser beam machining, electron beam machining, ultrasonic impact grinding, hydrodynamic machining, thermochemical machining, abrasive flow machining, and electrical discharge wire cutting. abrasive jet machining...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003177
EISBN: 978-1-62708-199-3
... (hydrodynamic) lubrication ( Fig. 5 a) is the occurrence of a thick film of lubricant between tool and workpiece that completely prevents the metal-to-metal contact. The film between tool and workpiece is thinner, and some metal-to-metal contact takes place ( Fig. 5 b). This regime occurs in bar and wire...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003030
EISBN: 978-1-62708-200-6
... ). A lubricant is therefore any substance that is used to reduce friction and wear between moving surfaces. Lubricants are often externally applied, but solid materials may also be internally (self) lubricated. There are several basic lubrication regimes, ranging from hydrodynamic lubrication, where...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003104
EISBN: 978-1-62708-199-3
... in temperature due to frictional heating. Hydrodynamic lubrication occurs when the viscous property of a fluid during a shearing between two surfaces in relative motion produces sufficient fluid pressure to separate the surfaces and support a load. The hydrodynamic effect occurs when the fluid...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004008
EISBN: 978-1-62708-185-6
... friction is not influenced by Δ, frictional heating is aggravated by low Δ processing. Fortunately, there is a tendency for low approach angles (and thus low Δ) to foster hydrodynamic lubrication and a reduced coefficient of friction. Heat treatment usually involves annealing or softening so that the...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005417
EISBN: 978-1-62708-196-2
.... Source: Adapted from Ref 43 The coefficient of friction drops as the velocity increases under the boundary- and mixed-lubrication regimes, while frictional resistance increases with speed under hydrodynamic lubrication caused by the increasing frictional resistance within the layer of oil...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004007
EISBN: 978-1-62708-185-6
... hydrodynamically lubricated and friction is lowered (static to kinematic). The pressure drops to an essentially constant value, called the run-out or extrusion pressure. Finally, the fluid is depressurized to remove the extruded product. Higher pressures are typically required in conventional extrusion due to...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003225
EISBN: 978-1-62708-199-3
... effectiveness of lubricant Seals and filters could have failed Fretting induced by slight looseness in clamped joints subject to vibration Bearing and materials engineering design can reduce or eliminate problem Water contamination High velocities and uneven flow distribution, cavitation...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... form when the oxide films break down, to provide protective surface films against very high friction and adhesion. On the other hand, the presence of the lubricant can lead to hydrodynamic pressure buildup in the contact inlet, which can keep the contact surfaces completely separated, preventing any...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003061
EISBN: 978-1-62708-200-6
... Up to 10× greater (nongalling) Fatigue life 3× to 10× greater, M50 Speed (DN) 50% greater (low density) Nongalling Marginal lubrication capability Temperature capability 540 °C (1000 °F) Heat generator Substantial reduction Corrosion resistance Generally inert Nonmagnetic...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
... characteristic (for given erosive conditions) material surface occurs, including removal of chemicals (e.g., lubricants and cutting fluids remaining after production), a change of topography (removal of grinding marks, etc.), removal of fragments weakened or damaged during the production stage, generation of...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.9781627081863
EISBN: 978-1-62708-186-3
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.9781627081979
EISBN: 978-1-62708-197-9
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005339
EISBN: 978-1-62708-187-0
... the melt to form cast aluminum-graphite composites. Tests showed that cast aluminum-graphite composites could be run against aluminum alloys without seizing or galling, even under conditions of boundary lubrication. The initial work also included incorporation of SiC and alumina in the matrix of cast...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005686
EISBN: 978-1-62708-198-6
... molecular weight distributions (MWDs). The most common analytical tool for measuring MWD is gel permeation chromatography, where the polymer molecules in a dilute solution are separated according to their hydrodynamic volume when forced through a column of microporus gel particles. Subtle changes in MWD can...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003052
EISBN: 978-1-62708-200-6
... storage Isostatic pressing … … … Newtonian or elastic … 0–10 3 (b) Semiwet plastic forming Extrusion, pressing, and jiggering >0.9 ∼1 1–20 0.15–2.9 Newtonian 100–1000 10 2 –10 3 Lubricants used Injection molding >0.9 ∼1 1–20 0.15–2.9 Pseudoplastic <1000 10...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003816
EISBN: 978-1-62708-183-2
... fluid flow Design for streamlined flow; keep velocity low; remove gases from liquid phase; use erosion-resistant alloy. Fretting Chafing or galling, often occurring during shipment Lubricate contacting surfaces; interleave sheets of paper between sheets of metal; decrease load on bearing surfaces...