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Cold forging of sintered hollow polygonal disks with barreling

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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.

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Abbreviations

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)

p av :

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

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Authors and Affiliations

  1. W.B. Technical Education, Bikash Bhawan, Salt Lake, Kolkata, 700 064, India

    P. Das

  2. Department of Mechanical Engineering, Jadavpur University, Kolkata, 700 032, India

    Goutam Sutradhar

  3. Kalyani Government Engineering College, Kalyani, W.B., India

    T. Chakraborty

  4. Central Workshop & Instruments Section, Indian Institute of Technology, Kharagpur, 721 302, India

    S. Patra

  5. Dean of Faculty of Engineering, Jadavpur University, Kolkata, 700 032, India

    M. Mitra

Authors
  1. P. Das
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  2. Goutam Sutradhar
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  3. T. Chakraborty
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  4. S. Patra
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  5. M. Mitra
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Corresponding author

Correspondence to Goutam Sutradhar.

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Das, P., Sutradhar, G., Chakraborty, T. et al. Cold forging of sintered hollow polygonal disks with barreling. J Mater Sci 43, 3180–3188 (2008). https://doi.org/10.1007/s10853-008-2452-1

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  • DOI: https://doi.org/10.1007/s10853-008-2452-1

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