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thick film lubrication

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Published: 01 November 2013
Fig. 6 Three lubrication regimes experienced in sheet metal forming. (a) Thick-film lubrication. (b) Thin-film lubrication. (c) Boundary lubrication. Source: Ref 3 More
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Published: 30 September 2023
Figure 10.19: Film thickness entrained in hydrostatic lubrication of 2011-T3 aluminum, using caster oil, and a 22° die angle [ 195 ]. More
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Published: 30 September 2023
Figure 11.35: Deformation of a ring upset using a thick glass film as a lubricant. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250019
EISBN: 978-1-62708-345-4
... by friction, lubrication, and wear. Equations for calculating lubricant film thickness, which determines whether the gears operate in the boundary, elastohydrodynamic, or full-film lubrication range, are given. Also, given is an equation for Blok's flash temperature, which is used for predicting the risk...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390064
EISBN: 978-1-62708-459-8
... Abstract This chapter reviews the basic theory of lubrication in the context of metal forming applications. It discusses the rheological properties of fluids and their effect on fluid-film thickness at pressures, temperatures, and loading conditions typical of metal working processes...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390173
EISBN: 978-1-62708-459-8
... the friction and wear that occur in hot and cold rolling under hydrodynamic and mixed-film lubrication; the influence of viscosity, film thickness, rolling speed, interface pressure, pass reduction, and lubricant breakdown; and the effect of surface finish and defects. The chapter also provides best practices...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390241
EISBN: 978-1-62708-459-8
..., heat, strain, and distortion for different tooling configurations and geometries. It explains how to select and apply lubricants based on drawing speed, die design, and other factors and how to maintain sufficient film thickness for hydrodynamic, mixed, and solid-film lubrication conditions. It also...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300335
EISBN: 978-1-62708-323-2
... or lubricate surfaces, including solid film, chemical conversion, and vacuum coatings, surface oiling and texturing, and lubricating platings. It compares and contrasts methods based on thickness and depth and their relative effect on friction, erosion, and wear. coatings friction and wear properties...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390019
EISBN: 978-1-62708-459-8
... surfaces become rougher or smoother due to the effects of deformation, tooling interactions, and lubricant film thickness. It familiarizes readers with the concept of nominal contact, the role of asperities, and the effects of interface pressure, plasticity index, shear stress, and bulk strain rate...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390145
EISBN: 978-1-62708-459-8
... from one process to another. film thickness measurements friction force measurements lubricant evaluation simulation testing surface characterization wear testing In order for tribological processes to be understood and quantified, a great variety of measurements must be made. Some...
Image
Published: 30 September 2023
Figure 3.9: Surface roughness in rolling of lubricated aluminum with assorted lubricants. At very low film thickness, the surface of the tooling is impressed on the workpiece; at intermediate films, the final roughness depends on the film thickness. For large films, the surface roughness More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400089
EISBN: 978-1-62708-316-4
... speed, and film thickness. If there is no lubricant at the tool/work piece interface, τ b will be zero and the frictional shear stress, τ f , will be a function of real contact area ratio, as expressed in Eq 7.3 . To take into account the lubricant behavior on friction, an artificial lubricant...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390325
EISBN: 978-1-62708-459-8
... through profilometry), h f is the fluid film thickness, and k t , k w , and k f are the thermal conductivities of tooling, workpiece and lubricant, respectively. The rate of heat transfer is then given by: (11.7) Q ˙ = U   A Δ T , where A is now the apparent contact area and Δ...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390284
EISBN: 978-1-62708-459-8
... of fluid have to be supplied and drained. Alternatively, a thick film of semisolid lubricant can be applied to the billet surface, which can be loaded as in usual cold extrusion but into a preheated container in which the lubricant melts to become the pressurized medium ( Fig. 10.12c ). If the clearance...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390100
EISBN: 978-1-62708-459-8
... lubricants (emulsions, synthetics, solutions); and a wide range of coatings and carriers. It also discusses solid-film lubricants (oxide films, polymer films, layer-lattice compounds) and environmental and safety concerns. aqueous lubricants coatings compounded lubricants greases metalworking...
Image
Published: 01 September 2005
Fig. 3 Regions of elastohydrodynamic contact between the mating gear teeth of a gearset. (a) Schematic showing three distinct regions on pinion and gear tooth surfaces and key parameters determining oil film lubrication. (b) Plot of pressure distribution within contact zone. b H , semiwidth More
Image
Published: 01 March 2001
Fig. 17 Schematic showing the relation of surface roughness to film thickness. Shown are conditions of full-film, thin-film, and boundary lubrication. More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390389
EISBN: 978-1-62708-459-8
... increases the draw stress and is, again, harmful. However, a thick lubricant film may also be undesirable because it allows wrinkling. Circumferential compression thickens the outer edges of the blank, so that when the gap between punch and die is equal to the original sheet thickness, some wall...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300391
EISBN: 978-1-62708-323-2
... be retained between rubbing surfaces to lower rubbing friction Thin-film lubricants: Solids applied at the atomic or molecular level to separate and lower friction between surfaces Liquid lubricants: Liquids with sufficient thickness and molecular properties to allow separation of rubbing surfaces...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350043
EISBN: 978-1-62708-315-7
... are forced to move relative to each other. It is closely associated with any wear mechanisms that may be operating and with any lubricant and/or surface films that may be present, as well as the surface topographies. The heat generated as a result of the dissipation of frictional interaction may affect...