| 摘要 |
PCT No. PCT/GB87/00293 Sec. 371 Date Dec. 27, 1988 Sec. 102(e) Date Dec. 27, 1988 PCT Filed May 1, 1987 PCT Pub. No. WO87/06509 PCT Pub. Date Nov. 5, 1987.A light metal component formed in a single piece and which has an aperture in the component, the aperture being entirely surrounded by the metal of the component, wherein a fracture zone is incorporated in the metal surrounding the aperture, with a brittle material incorporated in the component at the fracture zone so that the component can be split at the fracture zone, substantially without any ductile deformation, to separate a cap portion from the rest of the component to allow a separate component to be introduced into the aperture, whereupon the cap portion can be reunited with the rest of the component to close the aperture around the separate component.
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