| 摘要 |
A hydroforming unit comprises a mould ( 19,20 ) that can be opened and sealing arrangements ( 30 - 33; 35 - 39 ) for sealing the ends of a tube-formed blank ( 16 ) placed in the mould, each one of the sealing arrangements ( 30 - 33; 35 - 39 ) comprises a ring ( 30, 35 ) with a thin wall that fits into the inner surface of the tube ( 16 ), and a plug ( 33, 36 ) that can be displaced in an axial direction mounted axially inside of the ring, and an arrangement ( 32,37 ) for initially drawing the plug ( 33, 36 ) outwards to put the ring under elastic tension against the inside of the tube-formed blank so that the plug and the ring together form a seal. |
