Abstract:
A method of molding a container half body (10) by using a precoated steel sheet (21). An L-shaped part (36) in cross section is formed while retaining, by a blank holder (33) in a second drawing step, a first flat part (27) formed on the outer peripheral part of a first molded body (26) molded in a first drawing step. Accordingly, wrinkles do not occur at the vertical part (38) of the L-shaped part. An unnecessary portion (44) on the outside of a flange part (46) is cut off in a trim step. Accordingly, the width of the flange part is reduced. Also, since the narrow flange part is bent in a bending step so as to be flush with the vertical part, no wrinkle occurs thereon.
Abstract:
An improved double action bottom former (10) for forming and shaping a metal can blank comprising an integral cylinder housing member (32) having sidewalls forming first (44) and second (50) axial chambers, wherein the second axial chamber houses a piston suspension assembly (62) for resilient positioning of a clamp ring (26) and the first axial chamber houses a dome plug (24), which is resiliently positioned through use of a donut spring (74). In addition to serving as means to bias the dome plug, the donut spring comprises an interior cylindrical space (76) defining a third axial chamber (70) to increase the volumetric capacity of the second axial chamber for added capability in controlling the resilient positioning of the clamp ring insofar to permit high cyclic operation of the bottom former for a sustained period of time without deleterious impact on other operating components comprising bodymaking equipment.
Abstract:
A method of making a can having a recessed base (12) and, in particular, to a method of forming a recessed base (12) in can bodies of the type which include a side wall (14) having flutes or grooves (16) defined therein. A first forming step creates a preform having a side wall with at least one axially extending rib formed therein and a base which is coextensive with the side wall and intersects the side wall at a rim. This first forming step is performed so that at least a portion of the base is recessed by a predetermined depth with respect to the rim. The method further includes a second step which comprises a further drawing operation to form a can body having a recessed base. It is important that the predetermined depth be sufficient to prevent any of the axially extending ribs from being drawn into the recessed base.
Abstract:
A can end (10) has a peripheral seaming edge (14) for fastening to a can sidewall and a central panel (12). The deboss panel (70) has first and second spaced apart end portions (76, 78) joined by first and second sidewalls (80a, 80b). The first spaced apart end portion has an apex (82) and first and second arcuate portions (84a, 84b). A distance between the first and second arcuate portions is defined by a plurality of progressively increasing secant lengths (88a-88d). The score groove (22), in the deboss panel, has first and second ends (28, 30) connected by a curvilinear segment (32) that includes first and second curved segments (33a, 33b) joined by a transition point located adjacent the apex of the deboss panel and is defined by a plurality of progressively increasing chordal lengths (31a-31d). A ratio of the increasing secant lengths to the increasing chordal lengths increases along respective lengths of the first and second arcuate portions.
Abstract:
A method and apparatus for reforming the base profile of a can by using the difference in rotational speed of concentric shafts (A, B) to move a roller (5) radially into contact with the can base. A cam (10) is fixed to one (B) of the shafts and a pair of cam followers (12, 14) is mounted on a support block (6) which is connected to the other shaft (A) via linear bearings (7, 8). The support block also carries the reform roller and causes it to rotate around the can base. (Figure 5)