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hydrostatic extrusion

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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
...Abstract Abstract This article begins with a general review of the effects of changes in stress state on processing of materials. It describes the fundamentals of hydrostatic extrusion and reviews the various issues and benefits associated with hydrostatic extrusion. The article discusses...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006385
EISBN: 978-1-62708-192-4
...Abstract Abstract This article discusses two basic forms of extrusion: cold and hot. It provides information on three types of extrusion processes, namely, direct extrusion, reverse extrusion, and hydrostatic extrusion. The article also discusses the mechanics, analysis, tooling and die design...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004013
EISBN: 978-1-62708-185-6
... to the metal system being formed. Coextrusion can also be carried out using hydrostatic pressure, as was first demonstrated by the ASEA Quintus process used for the commercial production of bimetallic wire for electrical conductors ( Ref 5 , 6 ). Further discussions on extrusion equipment is provided...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001110
EISBN: 978-1-62708-162-7
... alloy matrix. The 19 filaments in the center of the array are high-purity (99.999%) aluminum. This composite was assembled using kit technology and was hydrostatically extruded at ambient temperature in a conventional extrusion press converted for dual hydrostatic/conventional use. Courtesy of Supercon...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006534
EISBN: 978-1-62708-207-5
... against the frictional force. Fig. 5 Variation of load or pressure with ram travel for direct and indirect extrusion Another less-common variation of the direct extrusion process is hydrostatic extrusion, where a fluid exerts pressure around the billet ( Fig. 6 ). The beneficial stress state...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006423
EISBN: 978-1-62708-192-4
... thickness induced at the deforming zone, metal-to-metal contact increases leading to higher friction, galling, and an increase in die wear. By comparison, random surface roughness with amplitudes on the order of a few microns can assist in carrying the lubricant to the interface, thus promoting hydrostatic...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004006
EISBN: 978-1-62708-185-6
... extruded shapes extrusion dies extrusion speed hot extrusion hydrostatic hot extrusion indirect extrusion lubricant lubricated hot extrusion nonlubricated hot extrusion presses HOT EXTRUSION is a process in which wrought parts are formed by forcing a heated billet through a shaped die opening...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006085
EISBN: 978-1-62708-175-7
..., this will be the minimum value for R , the extrusion reduction ratio. Fig. 15 Stress distribution along embedded fiber caused by uniaxial loading Hydrostatic Extrusion Hydrostatic extrusion is a variant of the process that involves extrusion by the action of a liquid medium surrounding the billet being...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003258
EISBN: 978-1-62708-176-4
... subjected to high levels of triaxial (hydrostatic) tensile stresses. Center-burst (chevron) cracking of solid rods in drawing and extrusion, plane-strain drawing of sheet or plate, and tube drawing or spinning are due to the high hydrostatic tensile stress component at the centerline of the workpiece during...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004002
EISBN: 978-1-62708-185-6
... of such materials, although hydrostatic extrusion of these materials is possible at room temperature ( Ref 37 , 38 ). In all cases, damage in the form of reinforcement cracking and/or reinforcement/matrix interface voiding may occur, even in compression. There is often a change in failure mechanism with increasing...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003183
EISBN: 978-1-62708-199-3
... or reverse extrusion. Lack of flash at the parting line decreases stress-corrosion cracking in forging alloys susceptible to this type of failure. Multidirectional hot working, characteristic of this process, decreases adverse directional effects on mechanical properties. Die Design and Materials...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009003
EISBN: 978-1-62708-185-6
.... Experience shows that the greater the compressive mean stress, the better the workability of a material. For example, it is known that most materials can be deformed more easily in an extrusion press and even more so with hydrostatic extrusion ( Ref 10 ). The mean or hydrostatic component of the stress state...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006488
EISBN: 978-1-62708-207-5
... and 400 °C (750 °F). Source: Ref 24 Much less work has been conducted on cold forming/forging, due to the more limited ductility of such materials, although hydrostatic extrusion of these materials is possible at room temperature ( Ref 25 ). In all cases, damage in the form of reinforcement...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005461
EISBN: 978-1-62708-196-2
... at the center continue to rise and cross the fracture line, coinciding with the formation of the central burst. The calculated hydrostatic tension at fracture was 0.3 yield stress ( Y ). This approach could be used for predicting central burst in drawing and extrusion to provide a material-dependent criterion...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009004
EISBN: 978-1-62708-185-6
... in the material during processing. In the spectrum of processes (extrusion, rolling, forging, and wire drawing), the average hydrostatic stress becomes increasingly tensile, and the strain to fracture progressively decreases. Within each of these processes, however, the stress and strain states can be considered...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004017
EISBN: 978-1-62708-185-6
... of stress. Experience shows that the greater the compressive mean stress the better the workability of a material. For example, most materials can be deformed more easily in an extrusion press and even more so with hydrostatic extrusion ( Ref 23 ). The mean or hydrostatic component of the stress state...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009006
EISBN: 978-1-62708-185-6
... with regard to the manner of metal flow through the die, and they have somewhat comparable workability problems. The major differences in workability behavior involve the difference in hydrostatic stress state (the flowing metal is generally subjected to much greater compression in extrusion than in wire...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.9781627081856
EISBN: 978-1-62708-185-6
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002485
EISBN: 978-1-62708-194-8
...; examples include extrusion, wire drawing, and deep drawing. Tension-Based Processes: Tensile loading is developed in the workpiece to cause thinning, with stretch forming being a primary example. Bending Processes: A bending moment is applied to cause a geometry change, the deformation being...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001105
EISBN: 978-1-62708-162-7
... Carbide Cermets Chromium Carbide Cermets Other Carbide-Base Cermets Powder Preparation Static Cold Pressing Cold Hydrostatic Pressing Warm Extrusion of Cement Powder Mixtures Power Rolling (Roll Compacting) Slip Casting P/M Injection Molding (MIM) Process Sintering Static...