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back extrusion

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Published: 01 January 2005
Fig. 35 Back extrusion of the cup shape shown in Fig. 34 . (a) The preform slug was 16 mm (0.625 in.) in diameter, the die was 19 mm (0.75 in.) in diameter. (b) Strains at the cup rim where fracture occurred consist of circumferential tension to a value of 0.18 and very little compressive More
Image
Published: 01 January 2005
Fig. 38 Modified preform slug for the back extrusion of the cup shape shown in Fig. 34 . The slug diameter is 18.8 mm (0.74 in.) and has a 5° taper on the top surface. More
Image
Published: 01 January 2005
Fig. 39 Comparison of measured strains at the cup rim during back extrusion of the modified preform slug shown in Fig. 38 . The strains do not exceed the material fracture strain line for low or high strain rate forming. More
Image
Published: 01 January 2005
Fig. 32 Preform alternatives for forging the ball bearing outer race shown in Fig. 30 . (a) Back extrusion. (b) Compression and radial inward flow More
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
... of the porous preform, and two solutions were considered that would avoid such stresses ( Fig. 32 ). The first solution was the use of a flat preform that involves back extrusion flow into the outer rim, and the second was the use of a tall, thin-wall preform that involves radial inward flow into the inner...
Image
Published: 30 September 2015
Fig. 14 The optimized Ti-6Al-4V BE powder-based extrusions (P4, P6, R6, and R7) da / dN behavior in comparison with back-to-back extruded IM-based Ti-6Al-4V material (R-4B-LT) extruded at the same temperature, strain rate, and extrusion ratio as all the other powder-based extrusions. Fatigue More
Image
Published: 30 September 2015
Fig. 13 The optimized BE powder-based extrusion (R6M) S - N behavior is shown to be superior to the back-to-back extruded IM material (R4) extruded at the same temperature, strain rate, and extrusion ratio. Source: Ref 2 More
Image
Published: 01 January 1997
Fig. 10 Extrusion processes. (a) Profile/sheet extrusion. (b) Blown film extrusion. (c) Construction arrangement of the plastication barrel of an extruder. 1, feed hopper; 2, barrel heating; 3, screw; 4, thermocouples; 5, back pressure regulating valve; 6, pressure-measuring instruments; 7 More
Book Chapter

Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001379
EISBN: 978-1-62708-173-3
... to promote initiation of extrusion. For reactive metals, such as zirconium, titanium, and tantalum, the retort may be evacuated and sealed. Both forward and back coextrusion have been employed, but forward coextrusion is the usual mode. A principal advantage of coextrusion welding is that the high isostatic...
Image
Published: 01 January 2005
Fig. 11 Change in extrudate dimensions as a result of glass film thickness decreasing from front end to back end of extrusion. Source: Ref 76 . More
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
... ). This is to avoid extrusion of the back end of the billet and billet skin into the part, because defects would result. The container is retracted and separated from the die, while the butt is still attached to the die face. If the dummy block is not affixed to the ram stem, it may remain adhered to the butt...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003015
EISBN: 978-1-62708-200-6
... Abstract This article describes the extrusion process, which converts soft, plastic material into a particular form using an extruder, or screw conveyer. It discusses the two main types of plastic extruders, twin-screw and single-screw, estimation of extruder capacity, and design and operations...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005567
EISBN: 978-1-62708-174-0
... thickness to promote initiation of extrusion. For reactive metals, such as zirconium, titanium, and tantalum, the retort may be evacuated and sealed. Both forward and back coextrusion have been employed, but forward coextrusion is the usual mode. A principal advantage of coextrusion welding is that the high...
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
... the discard or butt) in the container. This is to avoid extrusion of the back end of the billet and billet skin into the part, because defects would result. The container is retracted and separated from the die, while the butt is still attached to the die face. If the dummy block is not affixed to the ram...
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
... coextrusion. Shaving or back flow is a phenomenon more often observed in hydrostatic extrusion where there are no chamber walls to restrict the back flow. Fracture of either the sleeve or the core is observed when one of the components is significantly harder than the other. When the sleeve is harder than...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002157
EISBN: 978-1-62708-188-7
... Abstract Abrasive flow machining (AFM) finishes surfaces and edges by extruding viscous abrasive media through or across the workpiece. This article commences with a schematic illustration of the AFM process that uses two opposed cylinders to extrude semisolid abrasive media back and forth...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003016
EISBN: 978-1-62708-200-6
... reduction, and/or cost reduction. Machinery and Processing Methods Extrusion blow molding is the primary processing method used for engineering thermoplastics today. The process forms a hollow tube of molten plastic material called a parison. The parison formation is either continuous or intermittent...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006080
EISBN: 978-1-62708-175-7
... features is not considered because metal flow would be limited, leading to incomplete densification. Rather, the preform for this part would simply be a cylinder with a hole at the center. Forging the part from a cylindrical preform will involve various combinations of back extrusion of metal into the rim...
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
... , 28 , 29 , 32 , 34 , Ref 35 , Ref 36 , Ref 37 , Ref 38 , Ref 40 , Ref 41 , Ref 42 , 73 , 74 ). Summary of hydrostatic extrusion data for various materials without back pressure Table 1 Summary of hydrostatic extrusion data for various materials without back pressure Material...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005456
EISBN: 978-1-62708-196-2
... boundary toward the center and reaching a maximum at the neutral surface. Due to the force-balancing approach, the slab method permits the inclusion of forward and back tensions in the model formulation. In a recent paper, Rojas et al. ( Ref 11 ) used the slab method to determine tensions in the drawing...