K. Kojima et al., NUMERICAL-ANALYSIS ON EARING BEHAVIOR IN DRAWN CUPS OF STEELS BASED ON FINITE-DIFFERENCE OF ORIENTATION DISTRIBUTION FUNCTION, ISIJ international, 38(6), 1998, pp. 647-652
Earing behavior in cylindric drawn cups of conventional single-reduced
steel sheets and double-reduced steel sheets has been compared with t
he result predicted by the calculation from the orientation distributi
on function (ODF) data. Although the earing ratio of the cups of doubl
e-reduced steel sheets was larger than that of single-reduced steel sh
eets, the earing behavior of those steel sheets could be predicted by
the same calculating model, in spite of the difference in type of cold
-rolling process. This suggests that the second cold-rolling under 15%
reduction little affected the manner in slip deformation during drawi
ng. So it was concluded that the difference of earing behavior among t
he steel sheets was mainly caused by the difference of their textures.
To discuss the effect of texture on the earing behavior, the finite d
ifference of ODF (Delta f(g)) was defined. A reliability of a result c
alculated from Delta f(g) was confirmed by a comparison with a result
directly calculated from ODF data. By using the positive and negative
parts of the finite difference of the ODF, effects of increased and de
creased components on the difference of the earing behavior were separ
ated from each other. It was clarified that the influence of minor com
ponents (f(g)<1) on the earing behavior was not negligible in quantita
tive discussion of correlation between texture and earing behavior.