Patent ID: 8037734

Claim:
A method for manufacturing a DI can member using a bottle can member produced by drawing and ironing a metal plate, comprising the steps of: forming a mouth section by processing an aperture section of the bottle can member so as to reduce a diameter of the aperture section; forming an enlarged-diameter section by processing the aperture section so as to enlarge the diameter of the aperture section by a predetermined distance from an end of the mouth section; forming an expanding section for winding up a lower section of a cap main member by decreasing a diameter of a thread section where a thread is to be formed on the enlarged-diameter section; forming the thread on the thread section where the thread is to be formed after forming the expanding section, wherein a plurality of threads are formed toward a can bottom direction from the end of the mouth section around an outer periphery of the mouth section of the bottle can member, and a height of a first thread which is disposed near the end of the mouth section of the bottle can member is set to be lower than a height of other threads in a predetermined angle range; forming a curl section on an end of the mouth section after the thread is formed; and axially compressing the mouth section during a step of putting a cap on said mouth section, which causes axial crushing of the first thread and radial expansion thereof so that the heights of all threads are approximately equal.