| 摘要 |
Apparatus and method for forming cylindrical tubular lateral extensions on cylindrical or oval body tube by swaging them from around an oval opening, which is narrower along the sides to compensate for the body curvature, the apparatus including a circular male swaging die with a profile that tapers at progressively decreasing angles to the stroke direction, i.e. a series of progressively steeper conical surfaces or a sphere. The die may be a complete ball which is rolled into a formed body tube; positioned over an opening therein and pushed therethrough by a ram driven through the opposite, aligned opening. The body tube may then be inverted and another ball rolled therein to be pushed through the opposite opening. |
