軟鋼板の深絞り性支配機構の究明

概要

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In the previous paper, it was pointed out that the r-value change during drawing deformation must be considered in the assessment of the deep-drawability of the commercially pure aluminum sheets. From the above new viewpoint, this paper deals with the drawability of mild steel sheets with a crystal structure different from aluminum, although a positive correlation between the drawability and the r-value has been already established. It is shown in this experiment that the limiting drawing ratio has a positive and nonlinear relation with the r-value. This result is examined by measuring separately the fracture strength, T_<cr>, and the maximum drawing load, T_<max>, which control the drawability. The T_<cr> has a positive relation with the r-value, as predicted by the theory, but the T_<max> remains constant irrespective of the r-value against the theory. The facts are attributed to the change of the r-value during drawing deformation in the same way as in aluminum. But the characteristics of the r-value change are quite different from those in the aluminum sheet.
1986-06-25