Title:
缶の製造方法
Document Type and Number:
Japanese Patent JP6948843
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a can manufacturing method capable of stably executing diameter expansion processing causing deformation which is large in change amount of a diameter in a long deformation region along a can axis direction, and producing a can having a beautiful appearance by preventing generation of forming scars, wrinkles or the like on a can body.SOLUTION: The can manufacturing method includes a diameter expansion part forming step of forming a diameter expansion part gradually larger in diameter from a lower side of a can body toward an upper side along a can axis direction in a diameter expansion scheduled part provided between a lower part arranged on a can bottom side of the can body and an upper part arranged on an opening end side. In the diameter expansion part forming step, diameter expansion processing of expanding the diameter of an entire region from the opening end of the can body to the diameter expansion scheduled part is carried out by a plurality of times in a divided manner while enlarging the processing diameter of a diameter expansion mold by entering the diameter expansion mold into the can boy to relatively move it in the can axis direction, and for each diameter expansion processing, the diameter expansion part is formed while shifting the position of a local diameter expansion part formed by each diameter expansion mold from the lower side to the upper side.SELECTED DRAWING: Figure 9
Inventors:
Atsushi Yamashita
Application Number:
JP2017111054A
Publication Date:
October 13, 2021
Filing Date:
June 05, 2017
Export Citation:
Assignee:
Universal Can Corporation
International Classes:
B21D51/26; B21D41/02; B21D43/00
Domestic Patent References:
| JP2009541066A | ||||
| JP2010504857A | ||||
| JP2015506842A | ||||
| JP2018527194A |
Attorney, Agent or Firm:
Masakazu Aoyama