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friction control

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Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300391
EISBN: 978-1-62708-323-2
... and friction control, the relationship between viscosity and breakaway friction, and the factors that affect load-carrying capacity and service life. friction control industrial greases liquid lubricants solid-film lubricants DUNCAN DOWSON, a distinguished professor at the University...
Image
Published: 01 December 2006
Fig. 7.29 Methods of controlling material flow using the friction between the extruded material and/or shearing. (a) Reduction of the bearing length to reduce the flow resistance. (b) Tapered feed to the die aperture to increase the flow resistance by reducing the material flow cross section More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260245
EISBN: 978-1-62708-336-2
... and tribology, and process control. extrusion Aluminum extrusion technology is developing rapidly to meet the costs of production in the recently competitive market. Extrusion plants are facing customer demands for excellent quality and higher productivity with a reduction in wall thickness and much...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260029
EISBN: 978-1-62708-336-2
... to the study of heat related to matter in motion. All thermodynamics systems require some energy source and transfer media to carry the heat to raise the temperature in the system. In extrusion, heat is generated by both the frictional work and the work of deformation. Heat generation and transfer take place...
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
... profile vary, giving rise to relative sliding. Even though pressures are only fractions of those that occur in shape rolling, adhesive or abrasive wear, tool pickup, and workpiece scoring may be encountered. Lubrication is then helpful, although some friction must be maintained to control strip movement...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040007
EISBN: 978-1-62708-300-3
... Abstract This chapter explains that the key to forging is understanding and controlling metal flow and influential factors such as tool geometry, the mechanics of interface friction, material characteristics, and thermal conditions in the deformation zone. It also reviews common forging...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480265
EISBN: 978-1-62708-318-8
.... It describes several welding processes, including arc welding, resistance welding, and friction stir welding, and addresses related issues such as welding defects, quality control, and stress relieving. The chapter also covers mechanical fastening techniques along with adhesive bonding and brazing...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300001
EISBN: 978-1-62708-323-2
... for 30% of the energy used worldwide. Friction and wear have many forms and each form has its speci c treatments. Friction and wear can be controlled by design and proper selection of materials. REFERENCES 1. C. Kajdas, S.S.K. Harvey, E. Wilusz, Encylopedia of Tribology, Elsevier, Amsterdam, 1990 2...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.t53700225
EISBN: 978-1-62708-279-2
... are drawn using rigid binders with constant preset binder forces under open-loop machine control. Binders can be flat or a combination of a fixed drawbead and a constant binder displacement. In flat binders, restraining forces in the drawn sheet are provided by friction between the binder plates...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400089
EISBN: 978-1-62708-316-4
... Abstract This chapter discusses the factors that must be considered when selecting a lubricant for sheet metal forming operations. It begins with a review of lubrication regimes and friction models. It then describes the selection and use of sheet metal forming lubricants, explaining how...
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
.... Even if the calculated μ or m is not quantitatively correct, it is still usable for modeling (and control) of the rolling process, as long as the same theory is applied for extracting μ and for predicting the effects of friction. If the aim of investigation is simply that of ranking lubricants...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300013
EISBN: 978-1-62708-323-2
... modern rolling devices have rubber wheels, and in agreement with this law, rubber hardness (durometer) can control the rolling friction. There may be other laws proposed by others, but the preceding laws are some of the more useful ones. However, the law of friction is more important than all others...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780259
EISBN: 978-1-62708-281-5
... is the science and technology of interacting surfaces in relative motion ( Ref 3 ), or, more simply expressed, the study of friction, wear, and lubrication. This article focuses on friction and wear as they relate to polymeric materials. The study and evaluation of friction are driven by the need to control...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610263
EISBN: 978-1-62708-303-4
... where fatigue failures are likely to occur in cold-driven rivet and friction joints, and why the fatigue strength of welded joints can be much lower than that of the parent metal, depending on weld shape, joint geometry, discontinuities, and residual stresses. The chapter also explains how to improve...
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
... developed to control spread through proper forging pass schedules [ 57 ]. Because of the much longer sliding distance, such spread is very sensitive to low values of friction, and this makes the test suitable for lubricant evaluation. The workpiece must be at least 10 times wider (longer) than the L...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400105
EISBN: 978-1-62708-316-4
... for hold-down force and punch force. The most critical region of a deep-drawn part is the flange, which is under circumferential compressive and radial tension stresses. In order to prevent wrinkling and to control the process, a blank holder (also referred to as the draw pad or binder) is used ( Fig. 8.1...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300121
EISBN: 978-1-62708-323-2
... or device fail. Electronics manufacturers are doing their best to eliminate all tribosystems that involve materials in sliding contact. Switches used to have sliding members (a tribosystem) that was subject to the vicissitudes of friction and wear. Now, many switches work by infrared sensing or some...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300301
EISBN: 978-1-62708-323-2
... was injected into the melt in the extruder barrel. Friction tests were run to optimize the friction, but this application would not work unless a controlled amount of silicone was added to the neat polymer. Polytetrafluoroethylene (PTFE) is widely used as a lubricant in many polymers. It is present...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2011
DOI: 10.31399/asm.tb.cfw.t52860035
EISBN: 978-1-62708-338-6
... length of mandrel, the buildup at the dwell can be minimized, and the wound length will have been precisely controlled. Fig. 4.3 Advanced method of pipe winding Geodesic Paths and Frictionally Modified Geodesic Paths A more advanced programming software system does not consider what...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300047
EISBN: 978-1-62708-323-2
... sports. Bowling alleys are lubricated to lower friction so bowlers can apply spin to the ball. Groundskeepers cut golf greens to control the rolling friction of balls; they cut greens short to reduce rolling resistance for tournaments and leave them longer for amateur play. Skiing speed is very dependent...