| 摘要 |
Apparatus for forming a reinforced pressure resistant can end shell from sheet material comprises a cutting ring (11), a cutting punch shell (13) enterable into said ring (11) to blank out a disc of material therebetween, an annular draw ring (14) axially aligned with said cutting punch shell (13) to support a peripheral margin of the disc held against it by said cutting punch shell, a die centre ring (15) arranged coaxially and slidably within the draw ring (14) and having an end face profiled to define a surface of a seaming panel of the can end shell, an ejector pressure ring (19) arranged coaxially and slidably within the punch shell and axially aligned with the die centre ring so that when in use peripheral material of the blank is restrained between the die centre ring and the ejector pressure ring, a draw punch centre (16) arranged coaxially and slidably within the ejector pressure ring and a reform pad (20) arranged coaxially and slidably within the die centre ring to engage the central panel of the blank opposite the draw punch centre. The end profile of the punch centre comprises an annular radiused nose (22) surrounding and defining a central substantially frustoconical recess (23), and the reform pad comprises a central cylindrical portion, dimensioned to deform the central portion of the blank around the nose (22) of the punch centre and into the recess (23), and an outer ring (31) spaced from the central cylindrical portion by an annular recess (30) dimensioned to receive the nose of the punch centre; the outer ring having an inward facing substantially frustoconical face (311) which flares outwardly from the recess (30). |
