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


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.


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



Perpendicular distance from center of disk to its outer edge


Perpendicular distance from center of disk to its inner edge


Length of the side of polygon


Half thickness of the specimen


Constant(equal to 2)


Average pressure at the die/work piece interface


Surface of velocity discontinuity

\(|\Updelta V|\)

Magnitude of velocity discontinuity


Constant; a function only


Initial relative density of the preform


Yield stress of the non-work hardening matrix metal


Yield stress of the porous material


Shear stress


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • P. Das
    • 1
  • Goutam Sutradhar
    • 2
    Email author
  • 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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