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    • 3. 发明公开
    • METAL CONTAINERS AND METHODS OF MANUFACTURE
    • EP3411164A1
    • 2018-12-12
    • EP17700307.6
    • 2017-01-09
    • Crown Packaging Technology, Inc.
    • DUNWOODY, Paul Robert
    • B21D22/28B21D22/30B21D51/26
    • B21D22/28B21D22/30B21D51/26
    • A method of reducing a thickness and increasing a height of a cylindrical wall 13 of a metal cup 11 to form a can body comprises positioning a wall-ironing punch 40 inside the cup, moving an annular wall-ironing die 24 axially over the closed end of the cup towards the open end of the cup, but not beyond the open end of the cup, in order to iron the cylindrical wall from the closed end up to a position axially spaced from the open end and moving the wall-ironing die back in an opposite direction to remove the can body from the die. A step of moving the wall ironing die back in the opposite direction may be carried out with the punch positioned inside the can body in order to burnish a portion of the cylindrical wall. The base 12 of the cup 11 may be pushed against the punch 40 by the outer base-clamping tool 25 and the outer base-forming tool 26. The metal cup may include a flange 14 surrounding the open end and the method may include applying a force to the flange to remove the can body from the punch. Compressed air may be introduced into the can body 1 through channel 47 in the punch 40 to assist pushing the can body 1. A method of reducing a diameter of one or more regions of a can body is also disclosed by: pushing an annular tool having a number of portions of different diameter axially over the can body; and pushing a punch inside the can body, the punch having a number of portions of different diameter, wherein at least one portion has a diameter corresponding to a desired reduced can body diameter, to form the can body wall against the punch.