| 摘要 |
Open-ended cylindrical shells (S) for making beverage cans or containers, are necked (and/or flanged) at their open ends by tooling including a cooperating internal mandrel (42) and an external forming roller (44) while the opposite end of the shell is clamped by a chuck (40) which is rotated to spin the shell while the forming roller (44) forces the rim portion at the open end of the shell progressively into contact with the opposed mandrel (42) to form the neck (NK) and/or the flange (SL). The tooling is duplicated at regular spaced intervals around a pair of rotating wheels (12, 14); each roller (44) and anvil (42) being carried by one wheel (12) while each chuck (40) is carried by the other wheel (14); by this means, continuous production is achieved within a production loop or orbit which occupies limited space. Variations in shell thickness or metallurgy can be accommodated by employing a variable speed drive both for the chucks (40) and opposed rotatable collars (41) which fit into the open ends of the shells. The variable speed drive (86, 88) has gears driven counter to the rotation of the wheels (12, 14), this being a rotational action by which the forming operation may be performed most quickly. |
