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Title:
METHOD FOR FORMING TWO-PIECE CAN BODY, DEVICE FOR MANUFACTURING SAME, AND TWO-PIECE CAN BODY
Document Type and Number:
WIPO Patent Application WO/2018/070542
Kind Code:
A1
Abstract:
The present invention provides, a can, a method for manufacturing the same, and a device for manufacturing the same, wherein, in order to suppress degradation in the crush performance or pressure-resistance performance of a two-piece can when the plate thickness of a steel plate for a can is reduced, the position of a can bottom, contributing to crush performance and pressure-resistance performance, is specified, and the plate thickness at that position is increased during processing, thereby improving the crush performance and the pressure-resistance performance of the can bottom. To this end, the degree of contribution of each position on the can bottom, having an effect on the crush performance and the pressure-resistance performance, was evaluated, and it was made clear that a grounding section of the can bottom contributes to both types of performance. Provided is a processing method for increasing the plate thickness of the grounding section, the processing method being characterized in that: in a preprocessing step, a grounding groove section of the can bottom is formed in a shape having a greater depth than that of the grounding groove section of the can bottom upon completion of the forming, and then, in a main processing step, sagging material in the grounding section is pressed and crushed by a lower die by being sandwiched by a pad and an upper die which form a portion from a corner section to an outer wall section of a can body, and a portion extending from the central section of the can via an annular recessed section to an inner wall section.

Inventors:
YONEBAYASHI, Toru (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
AZUMA, Masafumi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
NONAKA, Toshiki (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
YOSHIKAWA, Nobuo (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
YOSHIDA, Tohru (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2017/037278
Publication Date:
April 19, 2018
Filing Date:
October 13, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
B21D51/26; B21D22/28; B65D1/14
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1, Toranomon 3-chome, Minato-k, Tokyo 23, 〒1058423, JP)
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