Method and device for increasing the wall thickness of the end of a thin-walled tube

摘要

The invention relates to a method and a device for increasing the wall thickness of the end of a thin-walled tube (2). The tube (2) is clamped down near one end, in such a manner that said end of the tube extends freely. In a first step, the end of the tube is deformed in a direction transversely to the longitudinal direction of the tube. Furthermore, a supporting mandrel (7) is inserted into said end of the tube and said end of the tube is furthermore surrounded by a supporting body, all this in such a manner that the distance between the outer circumference of the supporting mandrel (7) and the inner circumference of the supporting body is greater than the wall thickness of the tube. In a second step, a pushing force acting in the longitudinal direction of the tube is exerted on the free end of the tube, causing the end of the tube to be deformed in such a manner that the end of the material that forms the tube fills the space between the outer circumference of the supporting mandrel (7) and the inner circumference of the supporting body (3).