| 摘要 |
<p>A method of producing a multi-piece article 19, 20 from a single casting 17 is disclosed, the parts 19, 20 being intended to fit together in use. The casting 17 is produced in one piece with a cavity defined by a core 14 and the casting is separated by cutting, into at least two co-operating parts 19, 20 along a line around the walls of the core 14. A sealing member is provided on one part along the line to provide a seal between the parts when they are fitted together in use. A roof panel (30) is formed by cutting along a single piece casting to provide a fixed panel (31) and a sunroof panel 32 for a vehicle (figures 3, 4 - not shown). Sealing members (40A), (40B) are provided. A vehicle roof structure having a double skinned fixed roof and a single skin sunroof may also be produced (figures 5 to 7 - not shown). The core may be of lost core type or collapsible.</p> |
