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Title:
PRODUCTION METHOD FOR BOTTLE TYPE CAN AND FORM-WORKING TOOL
Document Type and Number:
WIPO Patent Application WO/2001/015829
Kind Code:
A1
Abstract:
A production method for a bottle type can, which uses as a blank a bottomed cylindrical can having a barrel wall thinner than a bottom wall and formed by drawing a metal thin sheet and subjecting the drawn sheet to thin-walling consisting of at least one of bending/elongating and ironing, and which integrally forms a shoulder portion having an inclined surface and a mouth/neck portion in a small-diameter cylinder shape by working on the bottom side of the can, the production method comprising a step of preforming the bottom corner portion of the can into a shoulder curved surface arcuate in longitudinal cross-section, a first small-diameter cylindrical portion forming step for drawing the bottom of the can into a bottomed cylindrical shape smaller in diameter than the barrel with the shoulder curved surface subjected to blank-holding, a second small-diameter cylindrical portion forming step for further drawing the bottomed cylindrical portion drawn from the can bottom into a smaller-diameter bottomed cylindrical shape with the bottom corner portion kept blank-held, and a shoulder portion re-forming step for forming by extrusion/elongation the shoulder portion formed by the first and second small-diameter cylindrical portion forming steps into a smooth inclined surface continuing from the shoulder curved surface on the barrel side after the diameter of the bottomed cylindrical portion obtained following at least one second small-diameter cylindrical portion forming step is reduced to approximately the same as that of the mouth/neck portion.

Inventors:
Enoki, Yasushi (Technical Center of Daiwa Can Company 5-5-1, Nishihashimoto Sagamihara-shi Kanagawa, 229-1183, JP)
Ogawa, Yukio (Technical Center of Daiwa Can Company 5-5-1, Nishihashimoto Sagamihara-shi Kanagawa, 229-1183, JP)
Moriya, Satoru (Technical Center of Daiwa Can Company 5-5-1, Nishihashimoto Sagamihara-shi Kanagawa, 229-1183, JP)
Application Number:
PCT/JP2000/005717
Publication Date:
March 08, 2001
Filing Date:
August 24, 2000
Export Citation:
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Assignee:
DAIWA CAN COMPANY (2-1-10, Nihonbashi Chuo-ku Tokyo, 103-8240, JP)
Enoki, Yasushi (Technical Center of Daiwa Can Company 5-5-1, Nishihashimoto Sagamihara-shi Kanagawa, 229-1183, JP)
Ogawa, Yukio (Technical Center of Daiwa Can Company 5-5-1, Nishihashimoto Sagamihara-shi Kanagawa, 229-1183, JP)
Moriya, Satoru (Technical Center of Daiwa Can Company 5-5-1, Nishihashimoto Sagamihara-shi Kanagawa, 229-1183, JP)
International Classes:
B21D22/30; B21D51/26; (IPC1-7): B21D51/26
Foreign References:
JPS59115239A1984-07-03
US2359775A1944-10-10
Other References:
See also references of EP 1134046A4
Attorney, Agent or Firm:
Watanabe, Takeo (Yushima Lemie Building 3rd Floor 21-15, Yushima 3-chome Bunkyo-ku Tokyo, 113-0034, JP)
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