| 摘要 |
The invention relates to a method for the production of multi-channel tubes, in particular flat multi-channel tubes, which comprises a first and a second step. The first step is forming, by means of extrusion, a tube having on the inside a multiplicity of ribs extending in the longitudinal direction of the tube, projecting from the inside wall of the tube and having free ends. The second step is compressing the extruded tube to bring the free ends of the internal ribs to close to, preferably in contact with, an opposing interior part of the tube such that a multiplicity of interior channels are formed in the tube. Step b) can be carried out stepwise in several steps. Preferably one or more mandrels are used for the extrusion, which mandrels essentially consist of a solid component with grooves formed in the circumferential surface thereof, which grooves have a base extending in the extrusion direction. The invention also relates to a multi-channel tube obtained using the method according to the invention and to an extrusion die and an installation for carrying out the method according to the invention. |
