| 摘要 |
PURPOSE:To prevent deformation of both rear and front plates in welding and obtain a nozzle blade of high precision by providing, in the interior of a hollow nozzle blade, a deformation preventing plate smaller than the external shape of an ultimately aimed nozzle blade by thickness of both rear and front plates of the nozzle blade. CONSTITUTION:A hollow nozzle blade 1 is formed as one body through uniting a rear plate 2, front plate 3 and a joint plate 4 by means of a welding part 5. In this case, when assembly of a joint plate 4 is performed, a deformation preventing plate 11, with the same shape as that of the inner wall side of the rear plate 2 and the front plate 3, is inserted and fixed temporarily. A contour shape 12 of the deformation preventing plate 11 is conformed to the shape smaller than that of the final nozzle blade required from view of design by thickness of the rear plate 2 and the front plate 3. Therefore, in case the rear plate 2 and the front plate 3 are shrunk during the abovementioned uniting of each plate 2-4, deformation of the rear plate 2 and the front plate 3 is prevented by means of the deformation preventing plate 11, and the contour after welding is conformed to the finally required one. |
