Analysis and Prediction of Earing Behavior in Cup Drawing of BCC Metals by Use of Crystallographic Method

概要

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Earing behavior in cup drawing of bcc metals has been investigated by use of a modified Tucker method using simple {110}<111> slip and complex {110}+{112}<111> slip respectively. The influence of stress state on earing behavior was analyzed by varying the ratio of radial stress to circumferential stress in the flange of the blank. The results demonstrated that, the earing characteristics of the main ideal orientations in bcc metal sheets could be well predicted by the present method. The earing behavior is not sensitive to the slip mode employed in the calculation. It was shown that the variation of stress ratio had no obvious influence on the earing profiles, and that the variation of earing extent with the stress ratio could be very different for various orientations. Based on the predictions and the experimental observations, the discrepancies existed in the literature for the earing tendencies of the main texture fibers were analyzed and clarified. It was shown that the earing tendencies of the same ideal orientations in bcc metals were not necessarily the same as those exhibited in fcc metals. The present method in conjunction with {110}<111> slip and stress ratio of 1 was satisfactorily applied to predict the six-ear results for two steels.
社団法人日本鉄鋼協会の論文
1999-05-15