| 摘要 |
An expansible mandrel for shaping large-diameter metal pipes used, for example, to convey petroleum products which includes the combination of an expansible central tube having a rubber wall braced with at least one pair of layers comprising metal wires or cables crossed from one layer to the other and inclined at an angle under 55 DEG and preferably comprised between 10 DEG and 45 DEG to the longitudinal axis of the tube and a cylindrical thick rubber sleeve arranged around the tube, said sleeve being externally covered with flexible longitudinal plates adhering to the rubber of the sleeve. |
