| 摘要 |
A metal sheet ring (5) has a web (15) extending between two fins (10) and (11) projecting towards a carrier hoop (6), wherein free ends of the fins rest on and couple to respective annular seats (8) and (9) defined in an internal face of the carrier hoop, the free ends being sealed by respective annular welding beads (14) to form an internal annular cooling tube (3) having an inside surface constituted by the metal sheet ring and the inside surface (7) of the carrier hoop. For the support and coupling of the ring (5) on the carrier hoop, a preform of the ring, formed outside of the carrier hoop, has a preform fin (10') open at an angle slightly greater than the angle of the other preform fin (11) and with a free end of smaller diameter than the inside surface diameter (7) of the carrier hoop (6), while the other preform fin (11) has a larger diameter than the diameter of the inside surface (7) of the carrier hoop (6) in a way that a final stamping action, which is the only action performed with the preform in the carrier hoop, gives the final configuration to the fin (10) of the metal sheet ring (5).
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