Wenderoth, Lind & Ponack
Method of forming long metal tubing to tapered shape
 A method for finishing a relatively long metal tubing stock to any desired tapered shape through a single-pass operation. The method is performed with any number of individual swaging units, arranged in tandem each having the identical construction including the same working parts and assemblies. A grooved roll arrangement, associated with the tandem-configured swaging units, is used as a preliminary step to form an initial metal tubing stock into a multiple-stepped shape. 
B B Y
B21C B21J Y10S
inventional inventional additional
Keiichiro
Yoshida