Method of changing the needle in an extrusion press of the tubes and extrusion press improved for the implementation of the process

摘要

The method involves moving an extrusion tool (11) between a position centering a die (1) on an extrusion axis and a position at a distance from the axis for removing the die. The tool is replaced in a third position at a distance from the axis by a mandrel changing tool to be placed in the centering position on the axis for disassembling a mandrel (4) or reassembling a new mandrel on a supporting unit (41). An independent claim is also included for an extrusion press with a hollow section having a die base and a fixed crossrail.