Method and apparatus for necking a metal container and resultant

Abstract

A method for necking an end of a metal container include effecting initial deformation, generally radially inwardly, of an axial portion to establish a necked-in generally convex transition portion and an adjacent portion disposed between the transition portion and the container end which is initially generally cylindrical. Both portions are of reduced diameter with respect to the original can body diameter. Sequentially, through the series of formation steps, the portion to be necked in is further reduced in diameter to produce an outwardly generally convex portion disposed in underlying relationship with respect to an outwardly concave portion. A generally, radially, outwardly directed flange may be established within the end section of the necked-in portion. Apparatus to perform the foregoing forming steps consists of a plurality of die means which are subjected to relative axial movement and contact and reshape the exterior of the container portion that is to be necked in. An additional embodiment has a necked-in portion having a plurality of alternating convex and concaved portions. A further embodiment has a straight angularly, inwardly oriented portion connected to the body by a radius greater than the radius of the connection to the neck. Products produced by these methods and apparatus are disclosed.