Sintered sheet specimens of copper of varying mean preform densities were free-bent with four V-bending punch radii and dies to obtain free bending force and the springback, for comparison with their wrought equivalents. The objective of the above testing was to highlight the influence of porosity in accommodating the springback. Following the free bending, die bending was performed to arrive at the optimal die force to ensure minimal springback. © 1997 Elsevier Science S.A.

Srikrishna Sriram

N. Jothi

P. Venugopal

Bending (forming)

COPPER POWDER METALLURGY

Mechanical testing

Porosity

Sintering

PREFORMED SHEETS

Springback

V BENDING

Sheet metal

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

V-bending studies on sintered copper powder metallurgical preform sheets

Journal of Materials Processing Technology

Mathematical expressions have been derived for relating the values of apparent strength coefficient Ka (in N/mm2) and strain hardening exponent na to preform density ρ{variant}0, based on axial ring compression tests. These equations are consulted for prediction of cold hooker extrusion forces for P/M preforms of various starting preform densities, ρ{variant}0. Experimental values of extrusion forces are compared with those predicted. Such analysis demonstrates the usefulness of the generated Ka, na against ρ{variant}0 equations to avoid elaborate experimentation on the extrusion. Besides, the analysis suggests that the void closure is persistent till the theoretical density and if corrections are applied for force, theory and experiment agree well. © 1988.

Journal of Mechanical Working Technology

Some uses of na and Ka in the prediction of cold extrusion forces of sintered powder metallurgical preforms

International Journal of Fatigue

Fatigue resistance of steelsBoardman, B. Metals Handbook 10th Edn (ASM International, Materials Park, Ohio, 1990) Vol. 1, pp 673–688

Journal of Applied Metalworking

Handbook of Metal Forming

Journal	Data powered by TypesetJournal of Materials Processing Technology
Publisher	Data powered by TypesetElsevier BV
ISSN	09240136
Open Access	No