On the Characteristics of Square Cup Drawing

抄録

It was shown experimentally that hard aluminium sheets had better drawability in square cup drawing than annealed ones unlike in circular cup drawing. The reason was investigated from separate measurements of the component loads supported by the side and the corner portion of the punch nose with a newly developed measuring device. It was revealed that the ratio of the side component load to punch load was larger in hard metals than in annealed ones. Some other characteristics of square cup drawing were also clarified from this measurement. The above explanation on drawing characteristics was justified by the fact that the drawability was improved by some artificial drawing methods.