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How fine can a cooling lubricant be filtered without losing its properties during grinding?


In the grinding industry, fine filtration is often used to keep the degree of contamination of the cooling lubricant as low as possible. But how does this fine filtration influence the lubricant and its properties? In order to investigate this problem, a test rig at WZL was set up which makes it possible to expose the cooling lubricant to high shear forces. The properties of the cooling lubricant are determined and compared to its original properties. Based on this knowledge, recommendations for cooling strategies in grinding technology are derived.

More informations:
David Braun, M. Sc
+49 (0) 241 80 20392
D.Braun@wzl.rwth-aachen.de



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Do you know how current research results from grinding technology are directly implemented in industrial practice?


The Research Circle Grinding Technology (AKS) of the WZL is bringing together experts in the field of grinding technology and the expertise of companies from the fields of grain and grinding wheel production, grinding machine production, cooling lubricant production, the automotive supplier industry and the energy and aviation industries. This year's online annual meeting focused on new trends such as the grinding of high-temperature resistant materials or assistance systems for process monitoring with machine learning. Many thanks to all members for their participation and the great support during the project realisation.

More informations:
Jannik Röttger, M. Sc
+49 (0) 241 80 24959
J.Roettger@wzl.rwth-aachen.de



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Do you already use Machine Learning to monitor your grinding process?


Integration of measuring systems in grinding machines for process monitoring is generally associated with huge financial cost and engineering expense. An economical alternative to the conventional sensor-based ProcessMonitoring is the data-based ProcessMonitoring of the existing signals from the machine control using MachineLearning algorithms. Dive into the current topics of DataScience and IoT as a new member of the research circle grinding technology AKS and participate in the development of the data-based ProcessMonitoring systems of tomorrow in collaboration with the WZL and multiple leading companies in grinding technology.

More informations:
Christian Wrobel, M. Sc
+49 (0) 241 80 27372
C.Wrobel@wzl.rwth-aachen.de



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Do you want to optimize your tool grinding process?


Why don’t you take a look at our research projects. For example conducted WZL a project funded by DFG to create a model predicting the grinding wheel wear dependent on the cemented carbide specification. Earlier projects already proved that the grinding of cemented carbides is highly dependent on the cemented carbide specification. This research suggests that in addition to influencing the machining behavior of the workpiece material, the specification also influences the wear behavior of the grinding tool. Single grain scratching experiments and grinding experiments, in combination with the analysis of the workpiece and the grinding tool, are the foundation for the model. These and other questions concerning tool production are also being researched in the Industrial Research Circle Tooling Technology (AKWT).

More informations:
Alexander Dehmer M. Sc
+49 (0) 241 80 24981
A.Dehmer@wzl.rwth-aachen.de



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Do you want to understand, monitor and optimize centerless grinding processes?


Centerless grinding is considered to be the supreme discipline of grinding processes. A larger number of process setting variables compared to external cylindrical grinding between centers makes process design and optimization very complex. A new concept of process monitoring for centerless grinding is currently researched by the Chair of Industrial Metrology at the Leipzig University of Applied Sciences and the WZL. The researchers from Leipzig have developed a method for oscillation diagnosis in centerless grinding machines using laser-optical sensors. The suitability of this measurement for predicting the workpiece quality is investigated in cooperation with the grinding experts at the WZL.

More informations:
Jannik Röttger M. Sc
+49 (0) 241 80 24959
J.Roettger@wzl.rwth-aachen.de



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Can thermally induced displacements in grinding machines be predicted and compensated by numerical-analytical methods?


A large part of the energy introduced during grinding is converted into heat. Since the cooling lubricant can not dissipate all the heat, thermally induced displacements in machine components occur, which have a negative influence on the component quality. To avoid component defects due to thermal displacement of machine components, numerical-analytical methods are developed at the #WZL as a part of the transregional collaborative research center SFB TR96. These methods allow a prediction of the thermo-mechanical load on the workpiece during the grinding process as a function of the grinding wheel topography. Thus enabling compensation for thermally inducted displacements.

More informations:
Marc Bredthauer M. Sc
+49 (0) 241 80 25416
M.Bredthauer@wzl.rwth-aachen.de



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Can grinding win the race of being the most valuable technology for the manufacturing of cutting tools?


In the cutting tool industry, machining of superhard materials like polycrystalline diamond and polycrystalline cubic boron nitride has always been a challenge. Despite the rise of laser processing as promising manufacturing technology, grinding is still widely used in the industry. This is mainly due to the high surface quality and due to the small heat-affected zone. In order to lower the grinding wheel wear and the processing time and thus boost the productivity of grinding superhard materials, we are constantly working on new grinding strategies, grinding tools, and process monitoring solutions in our lab at wzl.

More informations:
Ulrich Müller M. Sc
+49 (0) 241 80 28188
U.Mueller@wzl.rwth-aachen.de



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How do I achieve the desired quality with additively manufactured components?


Many companies face the challenge of finding a suitable post-processing solution for their additively manufactured components to meet the tolerances after the heat treatment. In order to provide even better support as an independent partner, WZL has expanded its post-processing research field by three additional machines. The machines, which base on Abrasive Flow Machining (AFM), Robot-guided Centrifugal Finishing (RCF) and Vibratory Finishing (VF), are used in particular for the post-processing of additive manufactured components in cooperation with DAP. Futhermore, they are suitable for any application where components with complex geometry are manufactured with high demands on surface roughness.

More informations:
Marius Ohlert M. Sc
+49 (0) 241 80 27429
M.Ohlert@wzl.rwth-aachen.de



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Development in grinding of thin-walled components


In aerospace, the #automotiveindustry as well as the energy and medicaltechnology, thin-walled components are increasingly required and designed due to current trends such as resourceefficiency and lightweightconstruction. When grinding thin-walled components, adapted grinding and spark-out strategies are needed for grinding. The relationships between the component wall thickness, the process parameters and the component deformation as a function of the grinding and spark-out strategies for grinding thin-walled components are systematically researched at WZL.

More informations:
Sebastian Prinz M. Sc
+49 (0) 241 80 20393
S.Prinz@wzl.rwth-aachen.de



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Optimierte Schleifstrategien für Turbinenbauteile


Turbinenschaufeln aus hochwarmfesten High-Tech-Werkstoffen müssen im Flugzeugtriebwerk höchsten thermischen und mechanischen Belastungen standhalten. Die hohe Härte und Zähigkeit dieser Werkstoffe erschweren die Zerspanung.
Optimierte Schleifstrategien für die wirtschaftliche Bearbeitung hochwarmfester Werkstoffe werden derzeit im Arbeitskreis Schleiftechnik AKS entwickelt. Dazu wird u. a. der Einfluss der CBN-Kornspezifikation auf die Schleifscheibenstandzeit bei der Bearbeitung von MAR M 247 untersucht. Basierend auf den Untersuchungsergebnissen werden Handlungsempfehlungen zur Produktivitätssteigerung in der industriellen Praxis abgeleitet.
Der AKS ist ein Forschungsnetzwerk mit aktuell 26 Mitgliedsfirmen. Gemeinsam werden zukünftige Trendthemen produzierender Unternehmen identifiziert und relevante Fragestellungen für die Schleiftechnik abgeleitet, die in Forschungsprojekten am Werkzeugmaschinenlabor WZL beantwortet werden. Unternehmen werden befähigt, aktuelle Forschungsergebnisse effizient und frühzeitig im eigenen Betrieb umzusetzen.

Weitere Informationen:
Jannik Röttger M. Sc      
+49 (0) 241 80 24959      
J.Roettger@wzl.rwth-aachen.de



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