Patent number: 6725698

Method for forming tube end

Original Assignee: Sakamoto Industry Co., Ltd.

Field of technology: Industrial Machinery and Processes

Patent granted on: Tue, 27 Apr 2004

Patent drawing

Abstract

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.