Abstract
Investigations are made on how the initial scatter in wall thickness existing along the transverse section of a tube will change when the tube is hollow-sunk through a die. The samples used are tubes of phosphor deoxidized copper and those of aluminium alloys. From the experimental results it turns out that the initial standard deviation in wall thickness, when not below 0.02 mm, invariably decreases in its value. It is expected that tubes of a certain eccentricity could be improved if consecutive drawings are properly done.
