Inventor: Akihiro Endo (Ohta, JP)
Assignee: Sakamoto Industry Co., Ltd. (Ohta, JP)

Method for forming tube end

Patent No. 6,725,698

Issued: April 27, 2004
Filed: December 3, 2001
Foreign Application Priority Data - filed in Japan: Jun 26, 2001 JP2001-192640 

 


At the time of spinning a tip reduced portion 3, an angle of inclination of the outer periphery of the tip reduced portion 3 with respect to an axis of a tube stock 2 is increased on a center side of the tube stock 2 and reduced on an end edge side thereof. By this, a generating line of an outer peripheral surface of the tip reduced portion 3 is made into a form like a center recessed curved surface.


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