Tribological DLC-Coatings in Combination with Surface Texturing for Forming Tools to Increase Lifetime and to Improve Process Quality (B04)
Third Party Funds Group - Sub project
Start date : 01.01.2009
End date : 31.12.2020
Website: http://www.tr-73.de/index.php/de/projekte?view=projekt&id=58
Overall project details
Overall project
TRR 73: Manufacturing of complex functional components with variants by using a new sheet metal forming process - Sheet-Bulk Metal Forming
Jan. 1, 2009 - Feb. 28, 2024
Overall project speaker:
Project details
Scientific Abstract
Scientific Abstract
The objective of the Transregional Collaborative Research Centre on Sheet-Bulk Metal Forming (CRC/TR 73), to combine the advantages and design possibilities of sheet metal and bulk metal forming in the production process of sheet bulk metal forming (BMU), is accompanied by high demands on the forming tool. Targeted local friction conditions on the tool surface are essential for effective control of the material flow. Only in this way, it is possible to form complex form elements of the sheet metal components while maintaining high quality requirements and at the same time avoiding undesirable changes in the components' geometry. In addition, the tool life is primarily limited by adhesive wear.
With the research of tribological DLC-coatings, the subproject B4 contributes to the development of active tool surfaces with a tribological behaviour adapted to the forming process. Among the group of DLC-coatings, tungsten-modified hydrogen-containing amorphous carbon coatings (a-C:H:W) show the most advantageous property profile for tool coating in application-oriented model tests and material analyses. They are characterized in particular by a low coefficient of friction and low wear. With the aid of statistical test methods, it is possible to predict and specifically adjust characteristic coating properties. By using different masking and ablation strategies, coatings of different tribological behavior can be combined on one surface and thus locally adapted friction can be realized.
Based on a-C:H:W coatings, which were continuously developed in the first two phases regarding a targeted friction adjustment, the extent to which the coatings can also contribute to an effective extension of the tool life will be focused in the current funding period. The coatings' fatigue life and wear resistance are further increased by multilayer and multi-phase coating architectures and substrate pretreatment measures. The contribution of the coatings to process-adapted friction conditions is being analyzed in application-oriented model and real tests. In addition, a complementary sensory function is implemented in the coatings. By recording electrical parameters in coating systems with high- and low-resistance layers, it will be possible to detect coating wear and thus predict the coating's life time more precisely and tool-specifically.
