Method for producing a hollow valve for internal combustion engines

A method for producing a valve body of a hollow valve, comprising the following steps:

• providing a workpiece blank;
• spin extruding the workpiece to create a preform, which has a cup comprising a hollow mold formed by a cup wall;
• flow forming of the preform after the spin extrusion to provide a reduced shaft diameter, wherein,
• there is a radial and an axial offset between at least three flow forming rollers during the flow forming step, wherein a radial distance of the flow forming rollers from a central axis is different for each respective roller, wherein a first of the flow farming rollers first machines the workpiece, said first flow-forming roller having a largest radial distance from the central axis, followed by another second flow forming roller having a second-largest radial distance from the central axis.