Influences of lubricant pocket geometry and working conditions upon micro-lubrication mechanisms in upsetting and strip drawing Online publication date: Mon, 30-Nov-2009
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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