A5080942622- Advanced machining processes and optimization
- Gear and Bearing Dynamics Analysis
- Advanced Measurement and Metrology Techniques
- Tribology and Lubrication Engineering
- Metallurgy and Material Forming
- Advanced Surface Polishing Techniques
- Iterative Learning Control Systems
- Tribology and Wear Analysis
- Flexible and Reconfigurable Manufacturing Systems
- Hydraulic and Pneumatic Systems
- Control Systems in Engineering
- Physics and Engineering Research Articles
- Manufacturing Process and Optimization
- Engineering and Materials Science Studies
- Robotic Mechanisms and Dynamics
- Mechanical stress and fatigue analysis
- Fault Detection and Control Systems
- Real-time simulation and control systems
- Scientific Measurement and Uncertainty Evaluation
- Shape Memory Alloy Transformations
- Brake Systems and Friction Analysis
- Metal Forming Simulation Techniques
- Advanced Statistical Process Monitoring
- Mechanical Failure Analysis and Simulation
- Structural Engineering and Vibration Analysis
RWTH Aachen University
2014-2024
FH Aachen
2016-2020
Passive vibration isolation is a key factor in achieving precise results milling processes and extending the service life of tools. An innovative approach involves using damping elements made from NiTi shape memory alloys. This based on alloys ability to convert large amounts mechanical energy into thermal through pseudo-elastic effect, with pronounced transformation hysteresis material providing its potential. While previous experimental studies have offered valuable insights, analytical...
This paper focuses on model development for computer analysis of the thermal behavior an externally driven spindle. The aim developed is to enable efficient quantitative estimation characteristics main spindle unit in early stage process. presented work includes experimental validation simulation using a custom-built test rig. Specifically, effects heat generated bearings and flux from bearing adjacent system elements are investigated. Simulation results compared demonstrate good accordance....
Friction losses are an important parameter for evaluating the operational behaviour of high-speed rolling bearings. Specifically, in machine tool applications, bearings subjected to high radial loads and speeds, which lead increased forces contact and, as a result, bearing friction. In this application, hybrid spindle bearings, typically made ceramic balls steel raceways, show better frictional compared full steel-made Therefore, precise knowledge friction characteristics can improve models...
1. HACKSTEINER M., DUER F., AYATOLLAHI I., BLEICHER 2017, Automatic Assessment of Machine Tool Energy Efficiency and Productivity, Procedia CIRP, 62, 317–22. Google Scholar
Kugelgewindetriebe (KGT) weisen abhängig von ihrer Geometrie und der vorherrschenden Belastung deutlich variable innere Lastverteilungen auf. Finite-Elemente-Modelle erlauben die Ermittlung dieser Verteilungen, aktuell jedoch vor allem bei Lebensdauerberechnung nur unzureichend berücksichtigt werden. Nachfolgend wird eine Methode zur Berücksichtigung ortsdiskreter in Kugelgewindetrieben vorgestellt.   Ball screws (BS) exhibit strongly varying internal load distributions depending on...
Abstract In modern machine tools, the thermo-elastic positioning error has a large share on overall tool error. A multitude of different approaches can be found in literature to correct this order improve accuracy tool. However, an FE-based approach model 5 axis tools is still active field research. Therefore, goal work improvement by modelling using FE model. The uses real time measurement data R-Test, as well temperature measurements structure.
Die Produktivität zerspanender Fertigungsprozesse wird heutzutage nach wie vor maßgeblich durch dynamische Prozessinstabilitäten limitiert. Eine a priori Ermittlung dieser Grenzen ermöglicht einen hauptzeitminimierenden Fertigungsprozess, ist jedoch unter Nutzung konventioneller Verfahren mit wesentlichen Zeit- und Materialaufwänden verbunden. Dieser Beitrag stellt Forschungsergebnisse vor, die diese Aufwände um circa 85 % reduzieren.
Anhand von Schnittversuchen an Stahl wird die verbesserte Stabilität einer Kegelrollenlagerspindel gegenüber Standardspindel mittels eines neuen, beschleunigten Messverfahrens demonstriert.
Eine präzise simulative Abbildung des komplexen thermo-elastischen Maschinenverhaltens ist derzeit nur mit hohem experimentellen Aufwand möglich. Daher wird eine Methodik auf Basis analytischer Reibmodelle am Beispiel von Vorschubachskomponenten vorgestellt, welche lastabhängige Reibungskennlinien für effiziente thermo-elastische Simulationsmodelle parametriert.   An accurate simulation of the complex thermo-elastic machine behavior requires a high degree experimental effort....
To improve the manufacturing accuracy in machining process, stiffness of machine tool spindle must be increased. One approach is to replace conventionally used bearings by tapered roller achieve a higher and load carrying capacity. However, speed capability this bearing type limited, though can enhanced sufficient lubrication, especially critically loaded rib-roller-contact. The objective paper validate lubricant influence on radially bearings. In various step runs, operating behavior under...
The further development of high-precision bearings regarding higher speeds and load-carrying capacity is becoming increasingly challenging. One approach to meet the increased requirements use new high-performance raceway steels. Particularly for a highly stressed lubricant film, where seizure may occur, bearing material properties can make key contribution in increasing lifetime. In following, test results hybrid spindle type 7008 made nitriding steel are analysed. were tested an endurance...
The thermo-elastic machine tool error, which is one of the main error sources in a tool, can be modeled and corrected using control. In past, models to do so have been parametrized precise measurement equipment like lasertracers. However, these lasertracers cannot used measure during cooling lubricant usage, necessary for most industrial applications. Therefore, this paper presents method on how behavior Integral Deformation Sensors compute center point displacement coolant usage based white...
Process instabilites due to the regenerative effect limit material removal rate of cutting machine tools. A method developed at Laboratory for Machine Tools and Production Engineering (WZL) RWTH Aachen University reduces experimental effort determining stability limits milling. The bears on a time-domain chatter detection algorithm, which detects process instability based predefined threshold values. Up now, definition values has been derived from selective number sample tests. To...
Abstract Due to increasing demands regarding higher manufacturing accuracy and the machining of high-strength materials, stiffness load-carrying capacity main spindles must be enhanced. One approach is replace conventionally used angular contact ball bearings, so called spindle with tapered roller bearings same size, which have a load carrying due their larger rolling contact. In case speed requirement below parameter $$n\cdot d_{m}=0.9\times 10^{6}$$ <mml:math...
Die Einführung der elektromechanischen Servolenkung in PKWs ermöglicht eine erhöhte Energieeffizienz und folgt damit dem globalen Trend Entwicklung effizienter Maschinen Anlagen. Eine anwendungsspezifische Auslegung von Kugelgewindetrieben (KGT) die Verwendung Komponente schweren Fahrzeugklassen für Steer-by-Wire-Systeme. In diesem Beitrag wird Methode zur Berechnung des Reibverhaltens KGT unter realen Belastungen vorgestellt.
Abstract Der Spindelsteigungsfehler weist einen signifikanten Einfluss auf das Betriebsverhalten von Kugelgewindetrieben auf. In diesem Beitrag wird ein Simulationsmodell vorgestellt, mit dem der des Steigungsfehlers die interne Lastverteilung, Steifigkeit und Lebensdauer quantifiziert werden kann. Mithilfe Modells im Anschluss an aktuelle Auslegungspraxis nach Norm angelehnte Korrekturfaktoren zur Berücksichtigung Spindelsteigungsfehlers berechnet.
The requirements for speed suitability and fatigue strength of motor spindle bearings are constantly increasing. These challenges can be met by further developing the bearings, e.g. using higher-performance bearing steels. In following, experimental investigation results a made new raceway steel tested on high-speed rolling test rig presented. Spindle type 7008 (hybrid execution) were in an endurance run at rotational 46 krpm 3 kN axial load. operating behaviour was validated based outer...