Direct or indirect pipe extrusion process, a mandrel for the pressing of tubes, as well as extruded tube pipe extrusion press

摘要

Has a mandrel for the pressing of tubes with two axially offset pressing surfaces of different radial protrusion as well as with a transition area between these two pressing surfaces in the transition region, a support surface, then it is possible to the negative effect of a constriction, which is formed by means of a repositioning of the mandrel of a first pressing position, in which the first of the two pressing surfaces interacts with a die, to a second pressing position, in which the second pressing surface interacts with the female mold is produced, can be minimized.