Tribology

Workpiece surfaces are gaining increasing importance. On one hand, they give a functional property to the produced workpiece; on the other hand, they crucially influence the effective friction mechanisms during the forming process in the forming zone. For the creation of convenient surfaces on semi-finished parts, the mechanisms leading to surface changes during forming processes, must be known. Furthermore, the transfer of gained knowledge on forming processes with different load profiles is of interest.

Working on tribological process optimization, it is important to realize friction conditions between tool and workpiece. It is crucial to have them as homogeneous, constant and well defined as possible. Furthermore, it is necessary to minimize the tool wear. A major precondition is the basic comprehension of appearing friction and wear mechanisms. Based on this, optimization methods can be derived, taking the whole tribological system, ranging from the semi-finished part over the lubricant to the tool, into consideration. In addition, active and local modifications of the contact zone are important parts, too. Finally, detected dependencies can be described in friction and wear models, providing a valuable input for more precise numerical simulations.

The fundamental experimental investigation of tribological circumstances about specific forming processes requires mapping of occurring tribological load profiles in model experiments. Under laboratory conditions, test stands offer the accessibility for measurement systems as well as the defined and selective adjustment of tribological loads. Besides experimental research, finite element method (FEM) is used, which allows the analysis of the tribological loads in the forming zone.