Influences of lubricant pocket geometry and working conditions upon micro-lubrication mechanisms in upsetting and strip drawing
by Ichiro Shimizu, Paulo A.F. Martins, Niels Bay, Jan L. Andreasen, Jakob I. Bech
International Journal of Surface Science and Engineering (IJSURFSE), Vol. 4, No. 1, 2010

Abstract: Micro-lubricant pockets located in the surface of plastically deforming workpieces are recognised to improve the performance of fluid lubrication in a metal-forming process. This work investigates the joint influence of pocket geometry and process working conditions on micro-lubrication mechanisms, during upsetting and strip drawing, by means of a rigid-viscoplastic finite-element formulation. Special emphasis is placed on the effect of pocket geometry on the build-up of hydrostatic pressure, which is responsible for the onset of micro-lubrication mechanisms. A good agreement is found between the numerically predicted and the experimentally measured distributions of hydrostatic stress.

Online publication date: Mon, 30-Nov-2009

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