Approximate model to calculate foldover and strains during cold upsetting of cylinders. Part I. Formulation and evaluation of the foldover model

Osama M. Ettouney, Kim A. Stelson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, a new approximate model to calculate foldover of a cylinder undergoing nonuniform compression test (simple upsetting) is presented. The model is formulated using constant-volume equations and workpiece geometry. In addition to foldover, the model can be used to calculate equatorial-axial strains. This eliminates the need for inscribing grids (when determining forming-limit diagrams) on the cylinder's free surface to find these strains. Combined with friction-calibration curves (prepared using finite-element analysis) that relate foldover to friction, the model enables one to estimate the friction coefficient. This eliminates the need for a separate test (e.g. the ring test) to determine friction or evaluate type of lubrication to be used. When compared to finite-element results and experiments, the new model showed excellent results in calculating foldover, strains and friction coefficient.

Original languageEnglish (US)
Title of host publicationComputer Modeling and Simulation of Manufacturing Processes
EditorsB. Singh, Y.T. Im, I. Haque, C. Altan
PublisherPubl by ASME
Pages165-179
Number of pages15
Volume20
StatePublished - Dec 1 1990
EventWinter Annual Meeting of the American Society of Mechanical Engineers - Dallas, TX, USA
Duration: Nov 25 1990Nov 30 1990

Other

OtherWinter Annual Meeting of the American Society of Mechanical Engineers
CityDallas, TX, USA
Period11/25/9011/30/90

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