| 摘要 |
A method and apparatus is disclosed for manufacturing a propeller nozzle ring (230), the method comprising forming a circular mould (220) having a side profile (222) that widens towards one end (226) of the mould (220), the mould (220) being arrangeable to the neck of an end (204) of a cylinder (200) so that a first end (224) of the mould (220) is towards the interior of the cylinder (200) and a second end (226) of the mould (220) has a cross-sectional surface greater than the end (204) in question of the cylinder (200); and forcing the mould (220) into the cylinder (200) for a predetermined distance so that the outer surface of the side profile (222) of the mould (220) runs against the inner surface of the cylinder (200) and thereby widens at least part of the cylinder (200) to match the widening shape of the side profile (222) of the mould (220), the cylinder (200) thus reaching the shape of the nozzle ring (230). |
