This paper presents some theoretical and experimental studies of the phenomenon known as bulge formation, during drawing with light reductions under conditions of plane strain. Experimental observations of the initiation of bulging agree approximately with values predicted by earlier theories. The development of the bulge as drawing proceeds has not hitherto been studied. A simple analysis is presented which predicts the growth and equilibrium height of the bulge and the influence of friction. This is substantiated by measurements with cold-worked aluminium.
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