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conical-die extrusion

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Published: 01 January 2005
Fig. 1 Conical die extrusion process More
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004022
EISBN: 978-1-62708-185-6
... procedures: defining the objective function, calculating the objective function, and searching an optimum design. It concludes with an example illustrating the optimization of conical-die extrusion. conical-die extrusion dies forming optimum design DIE AND PREFORM OPTIMIZATION is an activity...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004030
EISBN: 978-1-62708-185-6
.... The article also provides formulas for flat rolling, conical-die extrusion, wire drawing, deep drawing of cups from sheet metal, and bending, and formulas for anisotropic sheet materials. bending conical-die extrusion deep drawing flat rolling sheet metal forming strain strain rate stress...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005181
EISBN: 978-1-62708-186-3
... yield function Yld2000-2d for plane-stress deformation of sheet material. It also contains formulas related to flat (sheet) rolling, conical-die extrusion, wire drawing, bending, and deep drawing of cups from sheet metal. arbitrary coordinates Barlat's anisotropic yield function compression...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005542
EISBN: 978-1-62708-197-9
... Abstract This article is a comprehensive collection of tables containing formulas for metals processing, namely, casting and solidification, flat (sheet) rolling, conical-die extrusion, wire drawing, bending, and deep drawing. Formulas for compression, tension, and torsion testing of isotropic...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003429
EISBN: 978-1-62708-195-5
... shapes have been made with forward extrusion with a die and mandrel and with “bridge” dies as well as backward extrusion. An example of a die and mandrel setup is shown in Fig. 2 . The hole for the mandrel to pass through may be created by drilling billets or by piercing the billet in the extrusion...
Image
Published: 30 September 2015
Fig. 16 Comparison of load profiles of simple hydrostatic extrusion and conventional extrusion. (a) Conventional. (b) Hydrostatic with conical die More
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
... to the set speed. A somewhat conical-shaped deformation zone develops in front of the die aperture, as illustrated in Fig. 1(a) . After the maximum load has been reached and the ram speed is constant, the extrusion pressure decreases as the billet is extruded, and contact area with the container decreases...
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 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...
Image
Published: 31 December 2017
Fig. 20 Abrasive wear model: (a) abrasive wear by a conical hard particle (indenter), (b) roughness pattern on die bearing. Source: Ref 28 . Reprinted with permission from the Proceedings of the Eighth International Aluminum Extrusion Technology Seminar , published by the Aluminum Extruders More
Image
Published: 30 November 2018
Fig. 1 Deformation zone in extrusion or drawing solid section through a conical die. Rigid and plastic zones are illustrated; center-burst (chevron) cracking occurs when plastic zones do not meet. The same observations are also made in drawing flat sheet or plate through wedge-shaped dies More
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
... a conically defined surface ( Ref 6 , 16 ). As the included cone angle decreases from the extreme case of the flat die, flow becomes more streamlined, and the ogival characteristic of the transverse grid lines becomes less pronounced. Conical dies are used for the extrusion of canned powder to avoid...
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
... belongs to the general class of friction processing that relies on the heat generated by frictional forces to join or form metals. Friction extrusion involves rotating a round bar and pressing it against a die to produce sufficient frictional heating to allow softened material to extrude through the die...
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
... can rise significantly, leading to surface cracking and tearing (fir-tree cracking or speed cracking). Fig. 1 Deformation zone in extrusion or drawing solid section through a conical die. Rigid and plastic zones are illustrated; center-burst (chevron) cracking occurs when plastic zones do...
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
...) alloy, using polytetrafluoroethylene (PTFE) as the lubricant, and castor oil as the pressurizing fluid. This approach may be applicable to conventional cold extrusion through a lubricated conical die ( Ref 83 ). Hydrostatic Extrusion of Intermetallics or Intermetallic Compounds Comparatively...
Book Chapter

Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004031
EISBN: 978-1-62708-185-6
... metal part and is fastened to the master conical ange for a countersunk head rivet. die block. direct (forward) extrusion. See extrusion. die life. The productive life of a die impression, discontinuous yielding. The nonuniform plastic usually expressed as the number of units pro- duced before...
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: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004032
EISBN: 978-1-62708-185-6
... to be needed for optimum melt-away performance. At heavy reductions, a flat die is the simplest, eliminating the need for a conical billet end and ensuring optimum conditions even at extrusion ratios that would lead to severe inhomogeneity in unlubricated extrusion ( Fig. 9 ). In unlubricated metal flow...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
... land temperature ○ Open die gap wider ○ Reduce extrusion rate ○ Coat die wall with low-friction ceramic finish Process above the upper critical shear rate for melt fracture Use a processing aid (fluoroelastomers are common for polyolefins) Draw resonance Excessive drawdown...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005539
EISBN: 978-1-62708-197-9
... extrusion in conical dies, guaranteeing chevron-free parts ( Ref 23 ). Upper-bound methodologies were used to determine the conditions under which chevrons would form. Based on die-cone angle, process reduction, and friction conditions, Avitzur derived mathematical expressions to describe the central...