DIRECT OR INDIRECT METAL PIPE EXTRUSION PROCESS MANDREL FOR EXTRUDING METAL PIPES METAL PIPE EXTRUDER AND EXTRUDED METAL PIPE

摘要

Comprising two pressing surfaces (63, 64) axially offset with different radial embossing and having a transition region (66, 64) between the two pressing surfaces (63, 64) When the mandrel 6 for extrusion has a support surface 62 in the transition region 66, a first one of the two pressing surfaces 63 extends from a first pressurized position, where the first pressurizing surface 63 interacts with the die, The negative effect due to the shifting of the mandrel 6 to the second pressing position where the die 64 interacts with the die can be minimized.;