= = =

A diligent analysis of the width spread components t:,w8 and t:,wb was made by Shibahara, et al. According to their analysis, the bar width spread due to thickness reduction t:,w8 may be presented in the following form:

(13-29)

where h0 , hr_ bar thickness prior to edging and after reduction in thickness respectively

Theadditionalbarwidthspreadcausedbybulging/':,.wbcanbeexpressedbytheformula:

/':,.Wb=bde[1+/':,.~s] where

b=geometricalparameter.