| 摘要 |
A method of forming a metal sheet blank ( 7 ) by deep-drawing the sheet blank ( 7 ) so as to produce a deep-drawn pre-form ( 7 ) having a base portion ( 8 ) and a skirt portion ( 9 ) extending at substantially right angles therefrom. The height of the skirt portion ( 9 ) varies around the perimeter of the pre-form ( 7 ) so as to provide a skirt ( 9 ) having a curved edge course ( 10 ), and subsequently processing said curved edge ( 10 ) to obtain a curled or bent edge ( 10 ) having a curved course. The invention also relates to a tool ( 1,6 ) and an apparatus for forming a sheet blank and to a lid or container ( 7 ).
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