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Modeling the Material Behavior under Metal Cutting Conditions
The scientific goal of the present work was to model the workpiece material behavior of steels in the metal cutting process depending on the occurring thermo-mechanical loads. The results of this work shall make a significant contribution to the predictive process design of the cutting process by means of Finite Element (FE) simulations for the virtual representation of the reality in the sense of the digital twin. To achieve the objective, extensive empirical examinations were conducted in a first step, which included conventional material scientific and orthogonal cutting tests. This enabled the establishment of a database of the workpiece response with increasing thermo-mechanical loads. ...
Surface Anomalies in Turning of Difficult-to-Cut Materials with High-Pressure Coolant Supply
This thesis presents the underlying mechanisms for the occurrence of surface anomalies in turning of difficult-to-cut materials with high-pressure coolant supply. Based on empirical and analytical investigations of each type of surface anomaly, the cause-and-effect relationships between the relevant process parameters and the surface quality were identified, translated into an explanation model and validated in a case study. Finally, an overview of different possibilities for anomaly-free machining with high-pressure coolant supply were discussed.
Multiscale Modeling of Thermomechanical Loads in the Broaching of Direct Aged Inconel 718
The broaching process remains an essential machining process when manufacturing fir tree slots in turbine disks for aircraft engines. The cost- and time-intensive experiment-based approach restricts the application of alternative cutting tool materials when broaching nickel-based alloys. Given the accuracy and computation time, the developed model-based multiscale approach presents great advantages in prediction of the broaching process and thus can accelerate the development process.
Prädiktive Werkzeug- und Prozessauslegung für das Räumen von Nickelbasislegierungen
Die Fertigung komplexer Profilnutgeometrien in Triebwerksscheiben erfolgt in der Serienfertigung nahezu ausschließlich durch das Fertigungsverfahren Räumen. Allerdings sind die anwendbaren Schnittgeschwindigkeiten und Spanungsdicken und damit die Produktivität aufgrund der relativ geringen Warmhärte des Schneidstoffes Schnellarbeitsstahl eingeschränkt. Eine Alternative zur Erhöhung der Produktivität und zur Kostenreduzierung birgt die Verwendung Hartmetallen. Allerdings verfügen diese über nur über eine geringe Zähigkeit, was eine angepasste Werkzeugkonstruktion erfordert.
10th Manufacturing Engineering Society International Conference (MESIC 2023)
Selected peer-reviewed full text papers from the 10th Manufacturing Engineering Society International Conference (MESIC 2023) Selected peer-reviewed full text papers from the 10th Manufacturing Engineering Society International Conference (MESIC 2023), June 28-30, 2023, Sevilla, Spain
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Metternich
A compelling new biography that recasts the most important European statesman of the first half of the nineteenth century, famous for his alleged archconservatism, as a friend of realpolitik and reform, pursuing international peace. Metternich has a reputation as the epitome of reactionary conservatism. Historians treat him as the archenemy of progress, a ruthless aristocrat who used his power as the dominant European statesman of the first half of the nineteenth century to stifle liberalism, suppress national independence, and oppose the dreams of social change that inspired the revolutionaries of 1848. Wolfram Siemann paints a fundamentally new image of the man who shaped Europe for over f...
