This project is part of the Sonderforschungsbereich 442 called Ecological Tribosystems. The application of ecological coolants for cutting of materials, which are inproper or inadequate for dry cutting should be expanded. In addition, functions which were undertaken by conventional coolants (strong cooling function with emulsions, lubrication by different additives), should be shifted into the tools or compensated by coating technologies. More...


 

Dry cutting of aluminum alloys is very interesting, but the process is a difficult to conduct. The reasons for process problems are grounded of the good heat conductivity, the large thermal expansion and the low melting point. In addition the affinity of adhesion, which leads to built-up edges and illusory chip formation and in addition the formation of ribbon and snarled chips are the major problems of manufacturing. These difficulties can be mastered, if a careful fit of kinematics takes place on the material, which can be supported by the employment of a minimum quantity lubrication. ... More...


 

The coating technology by chemical separation of the gaseous phase (CVD) makes it possible to use diamond layers on strongly three-dimensional curved surfaces, presented by end millers, twist drills or by inserts with in-sintered chip form geometry. So the wear development at cutting tools can be come up against with the hardest material. The diamond coatings were manufactured by the CVD technology and are free from binders. This binder cannot be dissolved and additionally no abrasive tool wear like e.g. coatings of polycrystallines ... More...


 

The production of internal threads in titanium materials using taps is an extremely critical process due to the high thermal and mechanical load on the tools. This is caused by the pronounced high temperature strength, the low thermal conductivity and the low Young’s Modulus of titanium alloys. The central goal of the project was to develop high-performance tools to bring about significant increases in productivity (higher cutting speeds, shorter production times) and in process reliability (avoidance of tool failure, minimum burr formation) when producing internal threads in titanium materials. This, in turn, will lead to a reduction in production costs and help to secure competitiveness – particularly for small and medium-sized companies. More...


 

Crystalline hard coatings of γ-Al₂O₃ are distinguished by a number of material properties, which predestine them for their application as cutting materials in machining operations. Within this DFG-funded research project crystalline γ-Al₂O₃ coatings were applied on cemented carbide substrates using different PVD based coating processes. The impact of the coating morphology, grain size and intermediate layers on their properties during turning and milling processes were investigated More...


 

An approach to reduce the broaching manufacturing costs is to increase the process parameters while maintaining or even increasing the tool life. Further developments in the field of cutting materials provide a promising potential to reduce the manufacturing costs. Therefore, the main objective of this project is to develop innovative broaching tools based on a carbon-free cutting material with a focus on the technology of dry broaching. The principal aim of the new development is to widen the tooth module of internal teeth above 1,5. For a successful development of the tools, an optimized layout of the ... More...


 

Do you have questions concerning this research area?

Your contact:
Martin Seimann, M.Sc.
Workgroup Leader
Herwart-Opitz-Haus 54B 304
Tel.: +49 241 80-28020
Fax: +49 241 80-22293
Mail: M.Seimann@wzl.rwth-aachen.de

 

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