Dr.-Ing. Tim Rostek

Contact

Publications

Transregional Collaborative Research Centre 285

Member - External - Teilprojekt C03

VCard

Umformende und Spanende Fertigungstechnik

Chief Engineer - Academic Councillor

VCard

Phone:

+49 5251 60-5346

Fax:

+49 5251 60-5342

E-mail:

tr(at)luf.upb(dot)de

Office:

IW1.851

Web:

Homepage

Visitor:

Pohlweg 53
33098 Paderborn

Open list in Research Information System

2021

Cutting Blades for Food Processing Applications Manufactured Using Innovative Spin Forming

T. Rostek, H. Makeieva, W. Homberg, in: Proceedings of the 13th International Conference on the Technology of Plasticity, Springer, Cham, 2021, pp. 2115-2125

DOI

2020

Joining with Versatile Friction-Spun Joint Connectors

T. Rostek, E. Wiens, W. Homberg, Procedia Manufacturing (2020), 47, pp. 395-399

DOI

2019

Improved set up strategies for steel strip straightening machines

T. Rostek, W. Homberg, in: AIP Conference Proceedings 2113, 170018, AIP Publishing, 2019

DOI

2018

Optimization of Tooling Design for Hot Mandrel Bending of Pipe Elbows

U. Diekmann, W. Homberg, J. Prehm, T. Rostek, N. Schönhoff, D. Tabakajew, A. Trasca, H. Uysal, in: Materials Science Forum, Trans Tech Publications Ltd, 2018, pp. 159-164

Abstract

DOI

<jats:p>This paper presents the finite element model developed for the simulation of pipe elbow production by the so-called ‘Hamburg process’ in order to improve productivity and resource efficiency. To optimize the tooling design, a sensitivity analysis of the tool parameters that influence the quality of pipe elbows, such as mandrel height and length, is conducted. Different materials data sets including damage models were considered. Using numerical simulations, it is possible to determine an optimized tool geometry for the production of specific pipe elbow dimensions. Furthermore, as a result of the experiments and numerical simulations conducted, it is possible to increase the production velocity of the serial plant. Along with deformation, damage models are included in simulations in order to identify the right process boundaries. Finally, an experimentally validated model is developed for increasing resource efficiency in pipe elbow fabrication.</jats:p>

Grading Technologies for the Tanufacture of Innovative Cutting Blades

T. Rostek, W. Homberg, in: AIP Conference Proceedings 1960, 100013, AIP Publishing, 2018

DOI

Hybride Verbundstrukturen aus Aluminium und Titan für Leichtbauanwendungen

W. Homberg, T. Rostek, M. Schaper, O. Grydin, A. Andreiev, A. Brosius, C. Guilleaume, Universität Paderborn, 2018, pp. 28-33

2017

Locally Graded Steel Materials for Self-Sharpening Cutting Blades

T. Rostek, W. Homberg, Procedia Engineering (2017), 207, pp. 2185-2190

DOI

Development of hybrid directionally reinforced structural parts for lightweight applications

W. Homberg, T. Rostek, M. Schaper, O. Grydin, A. Andreiev, A. Brosius, M. Tulke, AIP Publishing, 2017

DOI

Locally Graded Steel Materials for Self-Sharpening Cutting Blades

T. Rostek, W. Homberg, Elsevier Ltd, 2017, pp. 2185-2190

DOI

2016

Layered Steel Materials for the Manufacture of Self-Sharpening Cutting Blades

T. Rostek, W. Homberg, International Journal of Material Forming (2016)

2015

Ein Beitrag zur Verarbeitung von Dickblech aus utlrahochfesten Stahlwerkstoffen

T. Rostek, Shaker Verlag, 2015

Abstract

Die Fertigung von innovativen Bauteilen aus ultrahochfesten Stählen erfordert oft Wärmebehandlungen zur Einstellung höchster mechanischer Festigkeiten. Bei Einsatz dickwandiger Halbzeuge mit entsprechend hoher Wärmekapazität eignen sich konventionelle Wärmebehandlungstechnologien und -prozessführungen jedoch nur eingeschränkt für einen effizienten Herstellungsprozess. Inhalt dieser Arbeit sind daher innovative Fertigungsstrategien, welche die wirtschaftliche Herstellung entsprechender Bauteile vor dem Hintergrund einer effektiven Formgebung sowie einer anforderungsangepassten Werkstoffbehandlung zum Ziel haben. Spezielle Temperaturführungsstrategien als auch thermomechanische Herangehensweisen zum Einstellen besonders günstiger mechanischer Eigenschaften entsprechender Stahlwerkstoffe stellen in diesem Kontext vielversprechende Ansatzpunkte dar.

Innovative Processing Techniques for the Manufacture of High-Performance Active Elements from Ultra High-Strength Steel Plate

W. Homberg, T. Rostek, 2015

Internal Flow-Turning - An Innovative Technology for the Manufacture of Tailored Tubes

W. Homberg, T. Rostek, E. Wiens, in: Key Engineering Materials, Trans Tech Publications Ltd, 2015, pp. 65-70

Abstract

DOI

<jats:p>In order to optimise the material utilisation and improve the lightweight design of automotive parts tailored hollow profiles are needed, especially as semi-finished parts for hydroforming. Internal Flow-Turning is an innovative incremental forming technology which enables the manufacture of tubes featuring a varying wall thickness and a constant outer diameter. These characteristics facilitate the material feed at hydroforming processes significantly. In addition, the spinning-related forming technology improves the mechanical material properties, shape and dimensional accuracy, and the surface quality of parts produced.</jats:p>

2013

Hochleistungsaktivelemente für landwirtschaftliche Maschinen aus ultrahochfestem Stahl

W. Homberg, T. Rostek, Verlag und Vertriebsgesellschaft mbH, 2013

Thermo-Mechanical Hardening of Ultra High-Strength Steels

W. Homberg, T. Rostek, Key Engineering Materials (2013), pp. 133-140

Abstract

DOI

<jats:p>nnovative ultra high-strength steels have excellent mechanical properties which commonly relate to the materials martensitic microstructure. As thermal heat treatments are state-of-the-art for obtaining the desired microstructure, innovative thermo-mechanical treatments are likely to give rise to even better material qualities. This article highlights various aspects of innovative thermo-mechanical hardening strategies for the processing of ultra high-strength steels, involving both press hardening and friction spinning operations.</jats:p>

Processing of Ultra High-Strength Steels involving Thermo-mechanical Hardening Effects

W. Homberg, T. Rostek, Proc. IDDRG 2013, 2013

2012

Presshärten von Rohren und Profilen mittels formlos festen Stoffen

A.E. Tekkaya, T. Mennecart, J. Witulski, W. Homberg, T. Rostek, Verlag und Vertriebsgesellschaft mbH, 2012

2011

High Performance Active Elements for Agricultural Machines Made of Ultra High-Strength Steels

W. Homberg, T. Rostek, Key Engineering Materials (2011), pp. 229-234

Abstract

DOI

<jats:p>This article will highlight various aspects of the production process of high performance active elements made of ultra high-strength steels. Focus is put on the processing of thick sheet metal regarding hot forming by means of punching, embossing, and forging processes as well as on thermo-mechanical treatment. Due to the material thickness of the semi-finished parts/blanks used and owing to the high strength of the materials (Rm > 2600 MPa) current production techniques and parameters from the field of thin sheet metal can only be limitedly be transferred and have therefore been specially investigated for this application.</jats:p>

Presshärten von Rohren und Profilen mittels formlos fester Stoffe

T. Mennecart, T. Rostek, J. Witulski, A. Brosius, A.E. Takkaya, W. Homberg, Meisenbach, 2011

High Performance Active Elements for Agricultural Machines Made of Ultra High-Strength Steels

W. Homberg, T. Rostek, in: Proceedings. of the 10th International Conference on Technology of Plasticity (ICTP), Springer, 2011

2009

Incremental forming of tubes and sheets assisted by friction-induced heating

W. Homberg, D. Hornjak, C. Beerwald, T. Rostek, J. Kunert, D.. Wilk, Auerbach, 2009

Open list in Research Information System