| 摘要 |
There is disclosed an arrangement for forming an elbow in a length of pipe comprising two internal die pins (1,2) each mounted for rotation, as limbs of cranked assemblies, about the same axis (8), the internal die pins being angled with respect to the axis of rotation and meeting each other in surfaces (9,10) lying in a plane normal to the axis of rotation, the surfaces being intersected by said axis of rotation; means for contra-rotating the cranked assemblies from a position at which the die pins are co-axial to a position at which they are aligned at a pre-determined angle with respect to each other. |
