Umformtechnische Herstellung hybrider Lagerbuchsen*/Manufacturing of Hybrid Bearing Bushings

2016 ◽  
Vol 106 (10) ◽  
pp. 743-748
Author(s):  
B.-A. Prof. Behrens ◽  
A. Bouguecha ◽  
M. Vucetic ◽  
A. Huskic ◽  
J. Uhe ◽  
...  
Keyword(s):  
Process Design ◽  
Collaborative Research ◽  
Research Centre ◽  
Process Chain ◽  
First Results ◽  
Erste Ergebnisse ◽  
Numerical Process ◽  
Hybrid Bearing

Im Fokus dieses Fachbeitrags steht die im Rahmen des Sonderforschungsbereichs 1153 angestrebte Entwicklung einer Prozesskette zur Fertigung einer hybriden Lagerbuchse aus Aluminium und Stahl. Es werden die Werkzeugkonzepte zur Halbzeugherstellung durch das Verbundstrangpressen sowie zum anschließenden Gesenkschmieden der hybriden Lagerbuchse vorgestellt. Des Weiteren wird ein Ausblick auf die numerische Prozessauslegung gegeben und erste Ergebnisse möglicher Erwärmungsstrategien werden präsentiert.   The focus of this paper is on the process chain development that is being researched within the Collaborative Research Centre 1153 for the production of a hybrid bearing bushing made of aluminium and steel. Here, the tool concepts for the production of semi-finished products through compound extrusion and the subsequent forging to a hybrid bearing bushing are introduced. Furthermore, an outlook on the numerical process design and the first results of the possible heating strategies are given.

Hybride Lagerbuchsen aus Aluminium und Stahl*/Numerical process design for the production of a hybrid bearing bushing made of aluminium and steel

2018 ◽  
Vol 108 (10) ◽  
pp. 691-697
Author(s):  
B. Behrens ◽  
A. Chugreev ◽  
T. Matthias
Keyword(s):  
Physical Properties ◽  
Process Design ◽  
Flow Properties ◽  
Forming Temperature ◽  
Temperature Ranges ◽  
Numerical Process ◽  
Hybrid Bearing ◽  
Tailored Forming ◽  
Thermo Physical Properties

Im Fokus dieses Beitrages steht die numerische Prozessauslegung zur Herstellung einer hybriden Lagerbuchse aus Aluminium und Stahl. Aufgrund der unterschiedlichen thermo-physikalischen Eigenschaften der Werkstoffe ergeben sich Herausforderungen bei der Umformung der hybriden Halbzeuge. Im Beitrag werden geeignete Umformtemperaturbereiche definiert, bei denen die beteiligten Verbundpartner vergleichbare Fließeigenschaften aufweisen, sowie die numerische Prozessauslegung vorgestellt.   This paper focuses on the numerical process design of a hybrid bearing bushing made of aluminium and steel using tailored forming. The different thermo-physical properties of the materials bring about challenges in the forming of the hybrid semi-finished products. Suitable forming temperature ranges are defined in which the two materials have comparable flow properties, and the numerical process design is presented.

Fließpressen hybrider Halbzeuge*/Extrusion of hybrid semi-finished workpieces

2015 ◽  
Vol 105 (10) ◽  
pp. 704-708
Author(s):  
B.-A. Behrens ◽  
A. Huskic ◽  
C. Frischkorn ◽  
D. Duran
Keyword(s):  
Collaborative Research ◽  
High Performance ◽  
Research Center ◽  
Process Chain ◽  
Welded Steel ◽  
Forming Technology ◽  
Erste Ergebnisse ◽  
Tailored Forming

Im Rahmen des neu eingerichteten Sonderforschungsbereichs 1153 „Prozesskette zur Herstellung hybrider Hochleistungsbauteile durch Tailored Forming“ der Leibniz Universität Hannover wird am Institut für Umformtechnik und Umformmaschinen (IFUM) die Formgebung gefügter Halbzeuge zu hybriden Massivbauteilen untersucht. Dieser Fachbeitrag stellt erste Ergebnisse zum Fließpressen von seriell angeordneten Hybridhalbzeugen aus reibgeschweißten Stahl/Aluminium-Verbunden vor.   As part of the newly established Collaborative Research Center 1153 “Process chain for the manufacturing of hybrid high-performance components by Tailored Forming” at Leibniz Universität Hannover, the Institute of Forming Technology and Machines (IFUM) examines the forming of joined semi-finished workpieces to hybrid solid components. In this paper, preliminary findings of the extrusion of friction welded steel/aluminium combination are presented.

scholarly journals Process chain for the manufacture of hybrid bearing bushings

2021 ◽  
Vol 15 (2) ◽  
pp. 137-150
Author(s):  
Susanne Elisabeth Thürer ◽  
Anna Chugreeva ◽  
Norman Heimes ◽  
Johanna Uhe ◽  
Bernd-Arno Behrens ◽  
...  
Keyword(s):  
Extrusion Process ◽  
Steel Tube ◽  
Case Hardening ◽  
Process Chain ◽  
Forming Process ◽  
Die Forging ◽  
Material Contact ◽  
Hybrid Bearing ◽  
Case Hardening Steel ◽  
Tailored Forming

AbstractThe current study presents a novel Tailored Forming process chain developed for the production of hybrid bearing bushings. In a first step, semi-finished products in the form of locally reinforced hollow profiles were produced using a new co-extrusion process. For this purpose, a modular tool concept was developed in which a steel tube made of a case-hardening steel, either C15 (AISI 1015) or 20MnCr5 (AISI 5120), is fed laterally into the tool. Inside the welding chamber, the steel tube is joined with the extruded aluminum alloy EN AW-6082. In the second step, sections from the compound profiles were formed into hybrid bearing bushings by die forging. In order to set the required forming temperatures for each material—aluminum and steel—simultaneously, a tailored heating strategy was developed, which enabled successful die forging of the hybrid workpiece to the desired bearing bushing geometry. Using either of the case-hardening steels in combination with aluminum, this novel process chain made it possible to produce intact hybrid bearing bushings, which showed both macroscopically and microscopically intimate material contact inside the compound zone.

Experimentelle Posenanalyse am Bearbeitungsroboter*/Pose dependancy of machining robots

2016 ◽  
Vol 106 (05) ◽  
pp. 347-353
Author(s):  
A. Karim ◽  
A. Waibel ◽  
A. Lechler
Keyword(s):  
Experimental Analysis ◽  
Industrial Robots ◽  
Machining Quality ◽  
First Results ◽  
Erste Ergebnisse

Die Verbesserung der Bearbeitungsqualität stellt einen aktuellen Forschungsschwerpunkt bei der spanenden Bearbeitung mit Industrierobotern dar. Dabei hängt die Bearbeitungsqualität des Werkstücks wesentlich von der eingenommenen Pose des Roboters ab. Der Fachbeitrag stellt die Durchführung einer experimentellen Analyse zur Bestimmung der Bearbeitungsqualität in unterschiedlichen Posen vor. Erste Ergebnisse werden ebenfalls präsentiert.   The improvement of machining quality is an actual focus of research in the area of machining with industrial robots. The machining quality that can be achieved is strongly dependant on the robot‘s pose. In the course of this paper the execution of experimental analysis for the determination of machining quality at different poses as well as first results are presented.

Das intelligente Instandhaltungssystem/The intelligent maintenance system - An approach for the self-learning structuring of maintenance libraries

2017 ◽  
Vol 107 (07-08) ◽  
pp. 530-535
Author(s):  
T. Miebach ◽  
M. Schmidt ◽  
P. Prof. Nyhuis
Keyword(s):  
Collaborative Research ◽  
The Self ◽  
Research Centre ◽  
Maintenance System ◽  
Intelligent Maintenance ◽  
Product Engineering ◽  
The Right ◽  
Self Learning ◽  
Intelligent Maintenance System

Der Fachbeitrag stellt eine Methode vor, mit der sich Bibliotheken von Instandhaltungsmaßnahmen selbstlernend gestalten lassen. Die „Intelligenz“ solcher Systeme bietet mehrfachen Nutzen, einerseits durch die Auswahl der passenden Instandhaltungsmethode zum richtigen Zeitpunkt, andererseits durch die damit verbundene Erhöhung des kompletten Abnutzungsvorrates. Die Ergebnisse sind im Sonderforschungsbereich 653 „Gentelligente Bauteile im Lebenszyklus – Nutzung vererbbarer, bauteilinhärenter Informationen in der Produktionstechnik“ entstanden.   This article describes a method to design a self-learning maintenance library. The benefit derived from the intelligence of those systems refers to the right choice of maintenance measures at the right time and the enhancement of the whole wear margin. The results are part of the Collaborative Research Centre 653: Gentelligent components in their lifecycle – Utilization of inheritable component information in product engineering.

scholarly journals Resilience in Mechanical Engineering - A Concept for Controlling Uncertainty during Design, Production and Usage Phase of Load-Carrying Structures

2018 ◽  
Vol 885 ◽  
pp. 187-198 ◽  
Author(s):  
Lena C. Altherr ◽  
Nicolas Brötz ◽  
Ingo Dietrich ◽  
Tristan Gally ◽  
Felix Geßner ◽  
...  
Keyword(s):  
Collaborative Research ◽  
Mechanical Engineering ◽  
Research Centre ◽  
Product Life ◽  
Usage Phase ◽  
Load Carrying ◽  
Design Production ◽  
Technical Systems

Resilience as a concept has found its way into different disciplines to describe the ability of an individual or system to withstand and adapt to changes in its environment. In this paper, we provide an overview of the concept in different communities and extend it to the area of mechanical engineering. Furthermore, we present metrics to measure resilience in technical systems and illustrate them by applying them to load-carrying structures. By giving application examples from the Collaborative Research Centre (CRC) 805, we show how the concept of resilience can be used to control uncertainty during different stages of product life.

Fuel Influence on Targeted Gas Turbine Combustion Properties: Part I — Detailed Diagnostics

2014 ◽  
Author(s):  
Thomas Mosbach ◽  
Victor Burger ◽  
Barani Gunasekaran
Keyword(s):  
Gas Turbine ◽  
High Speed ◽  
Leading Edge ◽  
Operating Conditions ◽  
Optical Measurements ◽  
Test Facility ◽  
Research Centre ◽  
High Speed Imaging ◽  
Combustion Properties ◽  
First Results

The threshold combustion performance of different fuel formulations under simulated altitude relight conditions were investigated in the altitude relight test facility located at the Rolls-Royce plc. Strategic Research Centre in Derby, UK. The combustor employed was a twin-sector representation of an RQL gas turbine combustor. Eight fuels including conventional crude-derived Jet A-1 kerosene, synthetic paraffinic kerosenes (SPKs), linear paraffinic solvents, aromatic solvents and pure compounds were tested. The combustor was operated at sub-atmospheric air pressure of 41 kPa and air temperature of 265 K. The temperature of all fuels was regulated to 288 K. The combustor operating conditions corresponded to a low stratospheric flight altitude near 9 kilometres. The experimental work at the Rolls-Royce (RR) test-rig consisted of classical relight envelope ignition and extinction tests, and ancillary optical measurements: Simultaneous high-speed imaging of the OH* chemiluminescence and of the soot luminosity was used to visualize both the transient combustion phenomena and the combustion behaviour of the steady burning flames. Flame luminosity spectra were also simultaneously recorded with a spectrometer to obtain information about the different combustion intermediates and about the thermal soot radiation curve. This paper presents first results from the analysis of the weak extinction measurements. Further detailed test fuel results are the subject of a separate complementary paper [1]. It was found in general that the determined weak extinction parameters were not strongly dependent on the fuels investigated, however at the leading edge of the OH* chemiluminescence intensity development in the pre-flame region fuel-related differences were observed.

scholarly journals The concept of socio-environmental transformations in prehistoric and archaic societies in the Holocene: An introduction to the special issue

The Holocene ◽  
2019 ◽  
Vol 29 (10) ◽  
pp. 1517-1530 ◽  
Author(s):  
Johannes Müller ◽  
Wiebke Kirleis
Keyword(s):  
Collaborative Research ◽  
Spatial Scales ◽  
Environmental Research ◽  
Research Centre ◽  
Detailed Data ◽  
Special Issue ◽  
The Holocene ◽  
Archaeological Methods ◽  
Temporal And Spatial

Transformations of human societies and environments are closely interwoven. Due to improved possibilities of paleoecological reconstruction and archaeological methods, we are now in a position to empirically collect detailed data from a variety of records. The Collaborative Research Centre 1266 ‘Scales of Transformation’ has developed a concept in which both deductive and inductive transformation dimensions are compared on different temporal and spatial scales. This concept includes the connection between the environmental and social spheres, which are often inseparable. Accordingly, a holistic principle of socio-environmental research is developed, which is exemplified by the contributions to this special issue of The Holocene.

Appraisal of Changes in Watercourse Quality as a Result of Sewer Reconstruction

1990 ◽  
Vol 22 (10-11) ◽  
pp. 213-221
Author(s):  
A. D. Parkinson ◽  
P. S. Davis ◽  
A. J. Saul
Keyword(s):  
Computer Modelling ◽  
River Basin Management ◽  
Research Centre ◽  
Combined Sewer Overflows ◽  
Basin Management ◽  
North West ◽  
Combined Sewer ◽  
First Results ◽  
The University ◽  
University Of Manchester

Major sewerage work in Littleborough near Rochdale in North West England resulted in the closure of eight Combined Sewer Overflows and the construction of a new overflow incorporating downstream storage. The paper describes the method, named the CARP procedure, used in setting the frequency and volume of discharge from the new overflow and, therefore, the size of the tank. The effect of the resewerage work on the River Roch is being studied as a collaborative exercise involving the University of Manchester, Water Research Centre and North West Water. This is part of the River Basin Management Programme of the Water Industry of England and Wales (Clifforde et al, 1986). First results indicate that the tank will not operate as frequently as predicted by computer modelling. The discharge from the new Combined Sewer Overflow would not appear to significantly effect the river. This is to be confirmed by further fieldwork.

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