Festschrift anläßlich der Emeritierung von Prof. Dr.-Ing. Walter Raab

Festschrift zum Festkolloquium am 8. April 1994 anläßlich der Emeritierung von Herrn Prof. Dr.-Ing. Walter Raab, Leiter des Fachgebiets Maschinenlemente und Mechanik an der Technischen Hochschule Darmstadt

Simulation des Einflusses von Formabweichungen auf die Betriebseigenschaften hydrodynamischer Gleitlager mit ALP3T und MATLAB

Die quantitative Abschätzung des Einflusses geometrischer Abweichungen auf die Betriebseigenschaften von Maschinenelementen stellt für die Produktentwicklung einen wesentlichen Bestandteil zur Sicherung der Funktionalität dar. An einem radialen zylindrischen Gleitlager wird gezeigt, wie der Einfluss der Rundheit in Form eines Gleichdickes die Betriebsparameter verändert. Durch die Simulation mit ALP3T und die Auswertung der Ergebnisse mit MATLAB kann eine mögliche Vorgehensweise für den Umgang mit Formabweichungen bei der Entwicklung und der Qualitätssicherung aufgezeigt werden. Ferner gilt es andere geometrische Abweichungen (Position, Richtung) zu untersuchen, um die Funktionalität des Gesamtsystems sicherzustellen

Influence of Hub Parameters on Joining Forces and Torque Transmission Output of Plastically-Joined Shaft-Hub-Connections with a Knurled Contact Surface

A knurled interference fit is a machine part connection made by a plastic joining, which includes the advantages of commonly-used shaft-hub-connections. The combination of the friction and form fit, which are responsible for torque transmission, results in a higher power density than conventional connections. In this paper, parameter gaps are bridged with the aim of enhance the design calculation of the knurled interference fit. Experimental investigations on the shaft chamfer angle (100Cr6) and hub-diameter-ratio (AlSi1MgMn) were performed. The analytical approaches are developed for calculating the joining force and maximal torque capacity by accounting for experimentally investigated loss of load transmission at high hub-diameter-ratios and high shaft chamfer angles. The presented calculation approach is an accurate tool for the assessment of early machine designs of the knurled interference fit and helps to save from having to perform time-extensive tests

High-Rate Laser Surface Texturing for Advanced Tribological Functionality

This article features with the enhancement of the static coefficient of friction by laser texturing the contact surfaces of tribological systems tested under dry friction conditions. The high-rate laser technology was applied for surface texturing at unprecedented processing rates, namely using powerful ultrashort pulses lasers in combination with ultrafast polygon-mirror based scan systems. The laser textured surfaces were analyzed by ion beam slope cutting and Raman measurements, showing a crystallographic disordering of the produced microscopic surface features. The laser induced self-organizing periodic surface structures as well as deterministic surface textures were tested regarding their tribological behavior. The highest static coefficient of friction was found of µ20 = 0.68 for a laser textured cross pattern that is 126% higher than for a fine grinded reference contact system. The line pattern was textured on a shaft-hub connection where the static coefficient of friction increased up to 75% that demonstrates the high potential of the technology for real-world applications

Festschrift anläßlich der Emeritierung von Prof. Dr.-Ing. Walter Raab

Festschrift zum Festkolloquium am 8. April 1994 anläßlich der Emeritierung von Herrn Prof. Dr.-Ing. Walter Raab, Leiter des Fachgebiets Maschinenlemente und Mechanik an der Technischen Hochschule Darmstadt