Project in the Field of Research
Tribology and Surface Engineering
HPPMS-CrAIN coatings for dry metal forming of steel (SPP 1676)
Within the project “Self-lubricating HPPMS-CrAlN-coatings for the use in dry cold forging processes of steel” tribological interactions in dry forming contacts between surface structured workpieces and self-lubricating tool coatings produced by HPPMS (high power pulsed magnetron sputtering) technology should be explained. Substitution of lubricants harmful to the environment in cold forging is targeted. Therefore, an innovative low-friction composite coating CrAlN+XS2 (X = W, Mo) for the use in cold forging and a novel Pin-On-Cylinder-Tribometer with axial feed for the scientific analysis of the influence of structured workpiece surfaces are developed. In addition, the complex interaction properties between tool and structured workpiece at microscale are described experimental-numerically.
In collaboration between the Surface Engineering Institute (IOT) and the Laboratory for Machine Tools and Production Engineering (WZL) of the RWTH Aachen an important base for a tribological system in dry forming process has already been laid within the first phase of the SPP 1676. The IOT developed a self-lubricating (Cr,Al)N+MoS2 PVD coating with a friction-reducing effect, while ensuring a maximum adhesion by using the HPPMS technology. The influences of disulfides in the (Cr,Al)N hard matrix, the process parameters during the coating process and their impact on the coating and compound properties as well as on the friction behavior were investigated. The WZL developed an innovative Pin-On-Cylinder tribometer with axial feed for methodological analysis of the influence of structured work piece surfaces. The experimental studies were backed up by a numerical description of the model complex contact conditions between the coated tool and structured work piece at the micro level.
The project members thank the Deutschen Forschungsgemeinschaft (DFG) for funding this research work within the priority programm „Schwerpunktprogramm SPP1676 - Trockenumformung“.
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Daniel Trauth Chief Engineer
Cluster Produktionstechnik 3A 440
Tel.: +49 241 80-27999
Fax: +49 241 80-627999