| 摘要 |
Method and machine for making rotational bodies by plastic deformation with a diameter varying lengthwise. Method wherein, upon rotating the blank, a local pressure is exerted with a progressive increase of force involved at start so as to reach a sufficient limit. For implementing such method, the blank is treated between two pressure areas which have an intersection by displacing the areas relatively between each other, while the blank is displaced in relation to the intersection point of the two areas and the variation of the diameter of the object to be manufactured. |
