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Journal of Materials Science

, Volume 43, Issue 9, pp 3180–3188 | Cite as

Cold forging of sintered hollow polygonal disks with barreling

  • P. Das
  • Goutam SutradharEmail author
  • T. Chakraborty
  • S. Patra
  • M. Mitra
Article

Abstract

The forging of sintered metal-powder performs creates a lot of interest throughout the world as one of the most economic method of manufacturing techniques. This process becomes more popular due to its simplicity and flexibility. During compression of regular polygonal disk between a pair of flat dies both bulging and barreling occurs simultaneously. Theoretical analysis considering bulging and barreling together is highly complicated and in this article an upper bound solution has been constructed for determining the die pressures developed during the compression of hollow polygonal disks taken into account the barreling only. The results so obtained are discussed critically to illustrate the interacted of various process parameters involved and presented graphically.

Keywords

Relative Density Hydrostatic Stress Work Piece Material Initial Relative Density Compressive Hydrostatic Stress 

Nomenclatures

A

Perpendicular distance from center of disk to its outer edge

B

Perpendicular distance from center of disk to its inner edge

2b

Length of the side of polygon

h

Half thickness of the specimen

k

Constant(equal to 2)

pav

Average pressure at the die/work piece interface

S

Surface of velocity discontinuity

\(|\Updelta V|\)

Magnitude of velocity discontinuity

\(\eta\)

Constant; a function only

\(\rho\)

Initial relative density of the preform

\(\sigma\)

Yield stress of the non-work hardening matrix metal

\(\sigma_{0}^{\prime}\)

Yield stress of the porous material

\(\tau\)

Shear stress

References

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • P. Das
    • 1
  • Goutam Sutradhar
    • 2
  • T. Chakraborty
    • 3
  • S. Patra
    • 4
  • M. Mitra
    • 5
  1. 1.W.B. Technical EducationSalt Lake, KolkataIndia
  2. 2.Department of Mechanical EngineeringJadavpur UniversityKolkataIndia
  3. 3.Kalyani Government Engineering CollegeKalyaniIndia
  4. 4.Central Workshop & Instruments SectionIndian Institute of TechnologyKharagpurIndia
  5. 5.Dean of Faculty of EngineeringJadavpur UniversityKolkataIndia

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