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die swell

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Published: 01 January 1997
Fig. 11 Die swell in extrusion. (a) Incorrect die design for intended profile. (b) Correct die design More
Image
Published: 15 May 2022
Fig. 6 Example of die design accounting for die swell More
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002464
EISBN: 978-1-62708-194-8
... that must be considered when processing engineering thermoplastics are discussed. These include melt viscosity and melt strength; crystallization; orientation, die swell, shrinkage, and molded-in stress; polymer degradation; and polymer blends. chemical properties crystallization die swell...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006915
EISBN: 978-1-62708-395-9
..., and addresses related considerations such as melt viscosity and melt strength, crystallization, orientation, die swell, melt fracture, shrinkage, molded-in stress, and polymer degradation. composition elastic modulus engineering plastics polymer properties polymer structure shear rate...
Image
Published: 15 June 2020
Fig. 10 As material leaves the nozzle, it expands, which is referred to as die swelling. Source: Ref 10 More
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006580
EISBN: 978-1-62708-290-7
... affect the as-printed part quality. As stated earlier, quality in this context refers to adherence to the original digital CAD geometry representation. Die Swelling and Ooze As material is extruded through the hot end and nozzle, it is compressed. When it leaves the nozzle, it expands, as shown...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002491
EISBN: 978-1-62708-194-8
... profile. Fiber is a cylindrical or tubular profile less than 0.0004 mm (0.010 in.) thick. Details and Design Considerations Details and design considerations for extruded parts include die swell and orientation. Die Swell Die swell ( Fig. 11 ) is the phenomenon where an extrudate...
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
... is die swell, which is the swelling of the polymer when the elastic energy stored in capillary flow is relaxed upon leaving the die. However, the extrusion of flat sheet or pipe is not sensitive to die swell because shape remains symmetrical even though the dimensions of the extrudate differ from those...
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
... by the die and webline units. Die design can be quite complicated; only a brief overview is provided here. The extrusion die must provide a uniform flow rate of material through the exit die gap, produce a melt with a uniform shear history, and maintain a uniform melt temperature. Extrudate swell...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006849
EISBN: 978-1-62708-395-9
... rate generates single data point viscosity. Multiple evaluations of the material at different shear stresses or rates combine to give a viscosity versus shear rate profile. Attempts to measure the percent die swell have not been totally successful. ASTM D3835-16 ( Ref 19 ) does caution that the barrel...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002455
EISBN: 978-1-62708-194-8
... gf) for 10 min at 190 °C (375 °F). Polymer melts also exhibit viscoelasticity, which results in die swell by which the hot polymer expands and changes shape when exiting a die opening or the mold. Table 11 shows whether these and other processing characteristics of the polymer melt are important...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005333
EISBN: 978-1-62708-187-0
... in Table 1 can cause die cast parts to swell, crack, or distort. The defects can occur within 1 year. The maximum limit for lead, which can promote the occurrence of a subsurface network of corrosion, is 0.006%. Cadmium is detrimental in its effect at some concentrations and neutral at others...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.9781627083959
EISBN: 978-1-62708-395-9
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003781
EISBN: 978-1-62708-177-1
... of the 10 mm (0.375 in.) diameter end of a tension test bar die cast from alloy 3 (UNS Z33520) to which 0.018% Pb was added (0.005% Pb is allowed). Exposed 10 days to wet steam at 95 °C (205 °F). Dark ring is intergranular corrosion. See also Fig. 5 Not polished, not etched. 6× Fig. 5 Micrograph...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006117
EISBN: 978-1-62708-175-7
... shrinkage to reach a given final density; higher final density Increase in sintering temperature Faster densification and grain growth; very rapid grain growth can lead to trapped pores in grains, pore growth and swelling; greater expense Increase in sintering time Larger final grain size; swelling...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003175
EISBN: 978-1-62708-199-3
... chemistry before pouring. Lead, cadmium, and tin levels must be held below 0.004% (or less in some alloys) to prevent die cast parts from swelling or cracking in service. Die Casting Zinc alloys are most commonly die cast using hot chamber machines, although cold chamber machines are used for casting...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006033
EISBN: 978-1-62708-175-7
... where these data help in the development of a constitutive model for sintering simulation. Finally, the article provides information on the simulation approaches used to optimize die compaction and sintering. compaction continuum modeling continuum plasticity models deformation densification...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005502
EISBN: 978-1-62708-197-9
...; accurate data are missing for most materials under the relevant conditions. For example, rarely is the strength measured for a steel alloy at the typical 1120 °C sintering temperature. Further, constitutive models do not exist for the conditions relevant to sintering; for example, friction in die...
Series: ASM Handbook
Volume: 4F
Publisher: ASM International
Published: 01 February 2024
DOI: 10.31399/asm.hb.v4F.a0007010
EISBN: 978-1-62708-450-5
... by the conventional oil quenching process. The subsequent formation of martensite in the core during intensive quenching ultimately results in the core swelling and a diminishing of the surface hoop compressive stresses. If core swelling is controlled by using a limited or lower hardenability steel (water-hardening...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005286
EISBN: 978-1-62708-187-0
... metal provided by primary production and recycling and the manufacture of aluminum and aluminum alloy products. Extrusions, forgings, sheet, plate, and foil begin as billet and fabricating ingot. Sand, permanent mold, investment, and pressure die castings typically originate in alloyed remelt ingot...