The required wall thickness is generated by the process-controlled gap adjustment between the roller tool and the die on the outside wall of the tube. This allows rapid adjustment of local thinning, ensuring a low economic batch quantity and hence cost-efficient manufacture in small numbers (for prototypes, etc.). In addition, the self-compensating force path permits a compact design for the manufacturing unit, which also has an impact on cost-efficiency.
Studies carried out to date within the scope of the "Internal flow-turning" project have shown that it is possible to produce hollow steel parts with geometries that have so far been difficult to manufacture and which hold a high potential for lightweight design. Further investigations should reveal the influence of the process parameters on the component properties and the process limits, for purposes of optimizing the process control. In addition to this, new tool concepts will be developed in order to further extend the forming and geometrical limits.