| 摘要 |
The invention comprises at least one drawing core provided with a centred through-opening in the axial direction with a shaping neck where at least an inflow portion with a truncated cone shape forming part of the centred through-opening converges, the drawing core being immobilied on a support structure. The support structure comprises a first front frame and a second rear frame coupled to each other in such a way that they can be disassembled by screwing, the assembly of the two frames defining an inner space where at least the drawing core is housed such that it is held in an undetachable manner both in the axial direction and in the radial direction. |
