| 摘要 |
The method comprises the operations of:
- providing a strip (1) of sheet metal;
- curving this sheet-metal strip (1) and welding together its end portions (1a, 1b) so as to form a cylindrical ring (2) with a predefined diameter (d);
- subjecting the ring (2) to a first pressing operation so as to produce, by means of plastic deformation, a first annular shell part (3) shaped substantially in the manner of a truncated cone or annular sphere segment, having at its ends a smaller opening (3a) and a larger opening (3b), respectively, which are separated from each other by a predefined distance or height (h);
- subjecting this first shell part (3) to at least one second pressing operation so as to produce, by means of plastic deformation, a second annular shell part (4), which is again substantially in the form of a truncated conc, having a flattened, central, annular part (4c) and having a smaller height (h 2 ) and a larger opening (4b) bigger than those of the said first shell part (3); and
- subjecting said second annular shell part (4) to a final shaping operation so as to provide it with the desired form of the wheel disc (5).
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