| 摘要 |
A method of making a cellular beam comprising a plurality of apertures comprising the steps of taking a beam having a web and making a cut along the web to separate the web into two portions, each portion having joining parts lying on alternate sides of the longitudinal centre line of the web, separating said portions of the web and then joining said portions together in regions formed by juxtaposition of the joining parts of the two portions wherein said cut defines a first part of each aperture and, after separating said portions, at least one further cutting operation is performed to define a second part of each aperture to produce apertures of a desired shape when said portions are joined together.
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