---
_id: '60299'
abstract:
- lang: eng
text: Non-rotationally symmetrical joints can have different properties that can
be controlled by the joint orientation. This hypothesis is tested using a Reuleaux
triangle joint geometry. A tool design is carried out, followed by a numerical
sensitivity analysis of the tool geometry. Initial tools were manufactured for
experimental investigations and then adapted based on the findings of the sensitivity
analysis. The joints are characterized by micrographs, 3D scans, shear tensile
tests, head tensile tests and three-point bending tests and compared with a round
geometry. The analysis confirms the hypothesis. Thus, joints with adaptable properties
can be produced with one tool set.
author:
- first_name: Christian
full_name: Steinfelder, Christian
last_name: Steinfelder
- first_name: Clemens
full_name: Acksteiner, Clemens
last_name: Acksteiner
- first_name: Alexander
full_name: Brosius, Alexander
last_name: Brosius
citation:
ama: Steinfelder C, Acksteiner C, Brosius A. A new joint with versatile properties
based on a Reuleaux triangle geometry. CIRP Annals. Published online 2025.
doi:10.1016/j.cirp.2025.03.002
apa: Steinfelder, C., Acksteiner, C., & Brosius, A. (2025). A new joint with
versatile properties based on a Reuleaux triangle geometry. CIRP Annals.
https://doi.org/10.1016/j.cirp.2025.03.002
bibtex: '@article{Steinfelder_Acksteiner_Brosius_2025, title={A new joint with versatile
properties based on a Reuleaux triangle geometry}, DOI={10.1016/j.cirp.2025.03.002},
journal={CIRP Annals}, publisher={Elsevier BV}, author={Steinfelder, Christian
and Acksteiner, Clemens and Brosius, Alexander}, year={2025} }'
chicago: Steinfelder, Christian, Clemens Acksteiner, and Alexander Brosius. “A New
Joint with Versatile Properties Based on a Reuleaux Triangle Geometry.” CIRP
Annals, 2025. https://doi.org/10.1016/j.cirp.2025.03.002.
ieee: 'C. Steinfelder, C. Acksteiner, and A. Brosius, “A new joint with versatile
properties based on a Reuleaux triangle geometry,” CIRP Annals, 2025, doi:
10.1016/j.cirp.2025.03.002.'
mla: Steinfelder, Christian, et al. “A New Joint with Versatile Properties Based
on a Reuleaux Triangle Geometry.” CIRP Annals, Elsevier BV, 2025, doi:10.1016/j.cirp.2025.03.002.
short: C. Steinfelder, C. Acksteiner, A. Brosius, CIRP Annals (2025).
date_created: 2025-06-23T07:47:56Z
date_updated: 2025-06-23T08:00:05Z
department:
- _id: '630'
doi: 10.1016/j.cirp.2025.03.002
keyword:
- Joining
- Forming
- Property adjustment
language:
- iso: eng
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '132'
name: 'TRR 285 - B: TRR 285 - Project Area B'
- _id: '140'
name: 'TRR 285 – B01: TRR 285 - Subproject B01'
publication: CIRP Annals
publication_identifier:
issn:
- 0007-8506
publication_status: published
publisher: Elsevier BV
status: public
title: A new joint with versatile properties based on a Reuleaux triangle geometry
type: journal_article
user_id: '104464'
year: '2025'
...
---
_id: '59907'
abstract:
- lang: eng
text: Abstract. Flow forming is recognized for its precision in producing
rotationally symmetric components, but the use of metastable austenitic stainless
steel (AISI 304L) introduces challenges due to uncontrolled strain-induced α’
martensite formation. Variations in factors such as eccentricity and batch inconsistencies
lead to unpredictable microstructural profiles, limiting reproducibility [1,2].
This study addresses these issues by incorporating thermal actuators for cryogenic
cooling and induction heating to regulate forming temperatures, enabling control
of the α’-martensite content. Experimental investigations demonstrate that local
tempering during thermomechanical reverse flow forming produces discernible variations
in microstructure, affecting mechanical and magnetic properties [3]. Controlled
local adjustments of α’-martensite content allow for customization of properties
in seamless tubes, advancing manufacturing capabilities for complex, defect-free
components. The results presented demonstrate promising strategies for implementation
within the context of closed-loop property control in flow forming.
author:
- first_name: Bahman
full_name: Arian, Bahman
id: '36287'
last_name: Arian
- first_name: Werner
full_name: Homberg, Werner
id: '233'
last_name: Homberg
- first_name: Lukas
full_name: Kersting, Lukas
last_name: Kersting
- first_name: Ansgar
full_name: Trächtler, Ansgar
id: '552'
last_name: Trächtler
- first_name: Julian
full_name: Rozo Vasquez, Julian
last_name: Rozo Vasquez
- first_name: Frank
full_name: Walther, Frank
last_name: Walther
citation:
ama: 'Arian B, Homberg W, Kersting L, Trächtler A, Rozo Vasquez J, Walther F. Advanced
thermomechanical flow forming: A novel approach to α’-martensite control for enhanced
material properties. In: Carlone P, Filice L, Umbrello D, eds. Materials Research
Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-127'
apa: 'Arian, B., Homberg, W., Kersting, L., Trächtler, A., Rozo Vasquez, J., &
Walther, F. (2025). Advanced thermomechanical flow forming: A novel approach to
α’-martensite control for enhanced material properties. In P. Carlone, L. Filice,
& D. Umbrello (Eds.), Materials Research Proceedings (Vol. 54). Materials
Research Forum LLC. https://doi.org/10.21741/9781644903599-127'
bibtex: '@inproceedings{Arian_Homberg_Kersting_Trächtler_Rozo Vasquez_Walther_2025,
title={Advanced thermomechanical flow forming: A novel approach to α’-martensite
control for enhanced material properties}, volume={54}, DOI={10.21741/9781644903599-127},
booktitle={Materials Research Proceedings}, publisher={Materials Research Forum
LLC}, author={Arian, Bahman and Homberg, Werner and Kersting, Lukas and Trächtler,
Ansgar and Rozo Vasquez, Julian and Walther, Frank}, editor={Carlone, Pierpaolo
and Filice, Luigino and Umbrello, Domenico}, year={2025} }'
chicago: 'Arian, Bahman, Werner Homberg, Lukas Kersting, Ansgar Trächtler, Julian
Rozo Vasquez, and Frank Walther. “Advanced Thermomechanical Flow Forming: A Novel
Approach to α’-Martensite Control for Enhanced Material Properties.” In Materials
Research Proceedings, edited by Pierpaolo Carlone, Luigino Filice, and Domenico
Umbrello, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-127.'
ieee: 'B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, and F.
Walther, “Advanced thermomechanical flow forming: A novel approach to α’-martensite
control for enhanced material properties,” in Materials Research Proceedings,
Paestum, Italy, 2025, vol. 54, doi: 10.21741/9781644903599-127.'
mla: 'Arian, Bahman, et al. “Advanced Thermomechanical Flow Forming: A Novel Approach
to α’-Martensite Control for Enhanced Material Properties.” Materials Research
Proceedings, edited by Pierpaolo Carlone et al., vol. 54, Materials Research
Forum LLC, 2025, doi:10.21741/9781644903599-127.'
short: 'B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, F. Walther,
in: P. Carlone, L. Filice, D. Umbrello (Eds.), Materials Research Proceedings,
Materials Research Forum LLC, 2025.'
conference:
end_date: 2025-05-09
location: Paestum, Italy
name: The 28th International ESAFORM Conference on Material Forming - ESAFORM 2025
start_date: 2025-05-06
date_created: 2025-05-15T06:59:28Z
date_updated: 2025-10-30T13:55:08Z
department:
- _id: '156'
- _id: '153'
- _id: '241'
doi: 10.21741/9781644903599-127
editor:
- first_name: Pierpaolo
full_name: Carlone, Pierpaolo
last_name: Carlone
- first_name: Luigino
full_name: Filice, Luigino
last_name: Filice
- first_name: Domenico
full_name: Umbrello, Domenico
last_name: Umbrello
has_accepted_license: '1'
intvolume: ' 54'
keyword:
- Flow Forming
- Thermomechanical Forming
- α’-Martensite
- Property Control
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://mrforum.com/product/9781644903599-127/
oa: '1'
publication: Materials Research Proceedings
publication_identifier:
issn:
- 2474-395X
publication_status: published
publisher: Materials Research Forum LLC
quality_controlled: '1'
status: public
title: 'Advanced thermomechanical flow forming: A novel approach to α’-martensite
control for enhanced material properties'
type: conference
user_id: '36287'
volume: 54
year: '2025'
...
---
_id: '49430'
abstract:
- lang: eng
text: Within the current energy and environmental crisis, new material- and energy-saving
processes are needed. For this reason, this study focuses on the development of
a new forming technology for Ti-6Al-4V sheet metal. It is based on combination
of solution treatment by resistive heating with rapid tool-based quenching and
subsequent annealing. This new “TISTRAQ” process is comparable with press-hardening
already known for steels and hot die quenching known for aluminium alloys. One
of the main influencing factors for this process is the heat transfer coefficient
(HTC). It is an important driver for adjustment of basic parameters, as selection
of tool material or the forming speed but also plays an important role while elaborating
temperature distribution in the numerical model. Therefore, a new and unique test
rig was developed to determine the HTC and to perform tool-based heat treatment
at specimen level under laboratory conditions. The test rig was used to investigate
the influence of the titanium-tool-lubricant system on HTC and cooling rate. Further
the effect of heat treatment in the test rig and tool-based quenching on microstructure
and mechanical properties was studied. To improve the prediction of the temperature
distribution of the titanium during cooling, the HTC was integrated into the numerical
process simulation
author:
- first_name: Maximilian Alexander
full_name: Kaiser, Maximilian Alexander
id: '72351'
last_name: Kaiser
orcid: 0009-0008-1333-3396
- first_name: Fabian
full_name: Höschen, Fabian
last_name: Höschen
- first_name: Nina
full_name: Pfeffer, Nina
last_name: Pfeffer
- first_name: Mathias
full_name: Merten, Mathias
last_name: Merten
- first_name: Thomas
full_name: Meyer, Thomas
last_name: Meyer
- first_name: Thorsten
full_name: Marten, Thorsten
id: '338'
last_name: Marten
orcid: 0009-0001-6433-7839
- first_name: Pawel
full_name: Rockicki, Pawel
last_name: Rockicki
- first_name: Heinz Werner
full_name: Höppel, Heinz Werner
last_name: Höppel
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
citation:
ama: 'Kaiser MA, Höschen F, Pfeffer N, et al. The new TISTRAQ process: Solution
treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming
- investigation on heat transfer coefficient and influence on cooling rates. In:
IOM3. Chapter 14: Forming, Machining & Joining [Version 1; Not Peer Reviewed].
; 2024. doi:doi.org/10.7490/f1000research.1119929.1'
apa: 'Kaiser, M. A., Höschen, F., Pfeffer, N., Merten, M., Meyer, T., Marten, T.,
Rockicki, P., Höppel, H. W., & Tröster, T. (2024). The new TISTRAQ process:
Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal
part forming - investigation on heat transfer coefficient and influence on cooling
rates. IOM3. Chapter 14: Forming, Machining & Joining [Version 1; Not Peer
Reviewed]. 15th World Conference on Titanium, Edinburgh. https://doi.org/doi.org/10.7490/f1000research.1119929.1'
bibtex: '@inproceedings{Kaiser_Höschen_Pfeffer_Merten_Meyer_Marten_Rockicki_Höppel_Tröster_2024,
title={The new TISTRAQ process: Solution treatment with rapid quenching and annealing
for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient
and influence on cooling rates}, DOI={doi.org/10.7490/f1000research.1119929.1},
booktitle={IOM3. Chapter 14: Forming, Machining & Joining [version 1; not
peer reviewed]}, author={Kaiser, Maximilian Alexander and Höschen, Fabian and
Pfeffer, Nina and Merten, Mathias and Meyer, Thomas and Marten, Thorsten and Rockicki,
Pawel and Höppel, Heinz Werner and Tröster, Thomas}, year={2024} }'
chicago: 'Kaiser, Maximilian Alexander, Fabian Höschen, Nina Pfeffer, Mathias Merten,
Thomas Meyer, Thorsten Marten, Pawel Rockicki, Heinz Werner Höppel, and Thomas
Tröster. “The New TISTRAQ Process: Solution Treatment with Rapid Quenching and
Annealing for Ti-6Al-4V Sheet Metal Part Forming - Investigation on Heat Transfer
Coefficient and Influence on Cooling Rates.” In IOM3. Chapter 14: Forming,
Machining & Joining [Version 1; Not Peer Reviewed], 2024. https://doi.org/doi.org/10.7490/f1000research.1119929.1.'
ieee: 'M. A. Kaiser et al., “The new TISTRAQ process: Solution treatment
with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - investigation
on heat transfer coefficient and influence on cooling rates,” presented at the
15th World Conference on Titanium, Edinburgh, 2024, doi: doi.org/10.7490/f1000research.1119929.1.'
mla: 'Kaiser, Maximilian Alexander, et al. “The New TISTRAQ Process: Solution Treatment
with Rapid Quenching and Annealing for Ti-6Al-4V Sheet Metal Part Forming - Investigation
on Heat Transfer Coefficient and Influence on Cooling Rates.” IOM3. Chapter
14: Forming, Machining & Joining [Version 1; Not Peer Reviewed], 2024,
doi:doi.org/10.7490/f1000research.1119929.1.'
short: 'M.A. Kaiser, F. Höschen, N. Pfeffer, M. Merten, T. Meyer, T. Marten, P.
Rockicki, H.W. Höppel, T. Tröster, in: IOM3. Chapter 14: Forming, Machining &
Joining [Version 1; Not Peer Reviewed], 2024.'
conference:
end_date: 2023-06-16
location: Edinburgh
name: 15th World Conference on Titanium
start_date: 2023-06-12
date_created: 2023-12-04T10:00:21Z
date_updated: 2025-05-19T11:46:47Z
department:
- _id: '9'
- _id: '321'
- _id: '149'
doi: doi.org/10.7490/f1000research.1119929.1
keyword:
- Interfacial heat transfer coefficient
- Ti-6Al-4V
- nonisothermal forming
- thermomechanical processing
- TISTRAQ process
language:
- iso: eng
publication: 'IOM3. Chapter 14: Forming, Machining & Joining [version 1; not peer
reviewed]'
publication_status: published
quality_controlled: '1'
status: public
title: 'The new TISTRAQ process: Solution treatment with rapid quenching and annealing
for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient
and influence on cooling rates'
type: conference
user_id: '72351'
year: '2024'
...
---
_id: '49437'
abstract:
- lang: eng
text: "The phase and TTT diagrams of the Ti-6Al-4V system allow the development
of a new forming process for a more energy- and materialefficient production of
sheet metal parts. This new “TISTRAQ” process is composed of two steps. In terms
of process technology, the first step is comparable to a direct press-hardening
process already well known for steels. In this step, the Ti-6Al-4V sheet material
is resistively heated to a temperature below β-transus Tβ and, after a very short
holding time, simultaneously formed and quenched by use of water cooled tools.
Thereby, the β phase undergoes a martensitic transformation. The second step is
a subsequent short-time annealing, which leads to a hardening of the material.
In this work, a new test rig using resistive heating technique was used in order
to produce\r\ndifferent solution treated and tool quenched (STQ) and subsequently
annealed (STA) states. In this paper, the effects of heating rate, solution treatment
temperature and holding time on microstructure and mechanical properties are addressed.
For the characterisation, tensile testing and scanning electron microscopy were
used. By the systematic variation of applied processing parameters, dominating
effects on microstructure and mechanical properties were evaluated. For example,
the solution treatment temperature was found to have a significant effect on microstructural
features and characteristic strength and strain values. The obtained results reveal
a high potential for future technical applications."
author:
- first_name: Nina
full_name: Pfeffer, Nina
last_name: Pfeffer
- first_name: Maximilian Alexander
full_name: Kaiser, Maximilian Alexander
id: '72351'
last_name: Kaiser
orcid: 0009-0008-1333-3396
- first_name: Thomas
full_name: Meyer, Thomas
last_name: Meyer
- first_name: Mathias
full_name: Göken, Mathias
last_name: Göken
- first_name: Heinz Werner
full_name: Höppel, Heinz Werner
last_name: Höppel
citation:
ama: 'Pfeffer N, Kaiser MA, Meyer T, Göken M, Höppel HW. The new TISTRAQ process:
Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal
part forming - the effect of processing parameters on microstructure and mechanical
properties. In: IOM3. Chapter 14: Forming, Machining & Joining [Version
1; Not Peer Reviewed]. doi:https://doi.org/10.7490/f1000research.1119929.1'
apa: 'Pfeffer, N., Kaiser, M. A., Meyer, T., Göken, M., & Höppel, H. W. (n.d.).
The new TISTRAQ process: Solution treatment with rapid quenching and annealing
for Ti-6Al-4V sheet metal part forming - the effect of processing parameters on
microstructure and mechanical properties. IOM3. Chapter 14: Forming, Machining
& Joining [Version 1; Not Peer Reviewed]. 15th World Conference on Titanium,
Edinburgh. https://doi.org/10.7490/f1000research.1119929.1'
bibtex: '@inproceedings{Pfeffer_Kaiser_Meyer_Göken_Höppel, title={The new TISTRAQ
process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet
metal part forming - the effect of processing parameters on microstructure and
mechanical properties}, DOI={https://doi.org/10.7490/f1000research.1119929.1},
booktitle={IOM3. Chapter 14: Forming, Machining & Joining [version 1; not
peer reviewed]}, author={Pfeffer, Nina and Kaiser, Maximilian Alexander and Meyer,
Thomas and Göken, Mathias and Höppel, Heinz Werner} }'
chicago: 'Pfeffer, Nina, Maximilian Alexander Kaiser, Thomas Meyer, Mathias Göken,
and Heinz Werner Höppel. “The New TISTRAQ Process: Solution Treatment with Rapid
Quenching and Annealing for Ti-6Al-4V Sheet Metal Part Forming - the Effect of
Processing Parameters on Microstructure and Mechanical Properties.” In IOM3.
Chapter 14: Forming, Machining & Joining [Version 1; Not Peer Reviewed],
n.d. https://doi.org/10.7490/f1000research.1119929.1.'
ieee: 'N. Pfeffer, M. A. Kaiser, T. Meyer, M. Göken, and H. W. Höppel, “The new
TISTRAQ process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V
sheet metal part forming - the effect of processing parameters on microstructure
and mechanical properties,” presented at the 15th World Conference on Titanium,
Edinburgh, doi: https://doi.org/10.7490/f1000research.1119929.1.'
mla: 'Pfeffer, Nina, et al. “The New TISTRAQ Process: Solution Treatment with Rapid
Quenching and Annealing for Ti-6Al-4V Sheet Metal Part Forming - the Effect of
Processing Parameters on Microstructure and Mechanical Properties.” IOM3. Chapter
14: Forming, Machining & Joining [Version 1; Not Peer Reviewed], doi:https://doi.org/10.7490/f1000research.1119929.1.'
short: 'N. Pfeffer, M.A. Kaiser, T. Meyer, M. Göken, H.W. Höppel, in: IOM3. Chapter
14: Forming, Machining & Joining [Version 1; Not Peer Reviewed], n.d.'
conference:
end_date: 2023-06-16
location: Edinburgh
name: 15th World Conference on Titanium
start_date: 2023-06-12
date_created: 2023-12-04T11:08:49Z
date_updated: 2025-05-19T11:46:28Z
department:
- _id: '9'
- _id: '321'
- _id: '149'
doi: https://doi.org/10.7490/f1000research.1119929.1
keyword:
- Ti-6Al-4V
- thermomechanical processing
- resistive heating
- quench-forming
- process parameter-microstructure-properties relationship
language:
- iso: eng
publication: 'IOM3. Chapter 14: Forming, Machining & Joining [version 1; not peer
reviewed]'
publication_status: submitted
status: public
title: 'The new TISTRAQ process: Solution treatment with rapid quenching and annealing
for Ti-6Al-4V sheet metal part forming - the effect of processing parameters on
microstructure and mechanical properties'
type: conference
user_id: '72351'
year: '2024'
...
---
_id: '60300'
abstract:
- lang: eng
text: This study focuses on the phenomenological change in material strength caused
by a specific heat treatment and the subsequent analysis of the influence on the
clinching process and the resulting joint properties. For this purpose, three
series of tests were performed. In the first series of tests, the influence of
heat treatment up to 340 °C on the mechanical properties of an age-hardenable
AlMgSi alloy was investigated. Holding time and temperature were varied and the
material strength was evaluated by tensile and hardness tests. Two strength-increasing
and two strength-reducing heat treatment parameters were identified. In the second
series of tests, selected heat treatment parameters were applied to a larger number
of specimens and the joint strength was investigated by shear and head tensile
tests. In the shear tensile test, mainly the properties of the punch-side material
have an influence on the resulting joint strength. A change in strength of the
die-side material can be neglected. In contrast, the properties of both sheets
are important in the head tensile test. The strength of the joint will only increase
if the strength of both sheets is increased. In general, a strength increasing
heat treatment resulted in higher joint strength. In the third series of tests,
the factor of punch displacement was considered, which was demonstrated to directly
influence the formation of the clinched joint geometry.
article_number: '100263'
author:
- first_name: Christian
full_name: Steinfelder, Christian
last_name: Steinfelder
- first_name: Dennis
full_name: Rempel, Dennis
last_name: Rempel
- first_name: Alexander
full_name: Brosius, Alexander
last_name: Brosius
citation:
ama: Steinfelder C, Rempel D, Brosius A. Influence of the material properties on
the clinching process and the resulting load-bearing capacity of the joint. Journal
of Advanced Joining Processes. 2024;10. doi:10.1016/j.jajp.2024.100263
apa: Steinfelder, C., Rempel, D., & Brosius, A. (2024). Influence of the material
properties on the clinching process and the resulting load-bearing capacity of
the joint. Journal of Advanced Joining Processes, 10, Article 100263.
https://doi.org/10.1016/j.jajp.2024.100263
bibtex: '@article{Steinfelder_Rempel_Brosius_2024, title={Influence of the material
properties on the clinching process and the resulting load-bearing capacity of
the joint}, volume={10}, DOI={10.1016/j.jajp.2024.100263},
number={100263}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier
BV}, author={Steinfelder, Christian and Rempel, Dennis and Brosius, Alexander},
year={2024} }'
chicago: Steinfelder, Christian, Dennis Rempel, and Alexander Brosius. “Influence
of the Material Properties on the Clinching Process and the Resulting Load-Bearing
Capacity of the Joint.” Journal of Advanced Joining Processes 10 (2024).
https://doi.org/10.1016/j.jajp.2024.100263.
ieee: 'C. Steinfelder, D. Rempel, and A. Brosius, “Influence of the material properties
on the clinching process and the resulting load-bearing capacity of the joint,”
Journal of Advanced Joining Processes, vol. 10, Art. no. 100263, 2024,
doi: 10.1016/j.jajp.2024.100263.'
mla: Steinfelder, Christian, et al. “Influence of the Material Properties on the
Clinching Process and the Resulting Load-Bearing Capacity of the Joint.” Journal
of Advanced Joining Processes, vol. 10, 100263, Elsevier BV, 2024, doi:10.1016/j.jajp.2024.100263.
short: C. Steinfelder, D. Rempel, A. Brosius, Journal of Advanced Joining Processes
10 (2024).
date_created: 2025-06-23T07:54:23Z
date_updated: 2025-06-23T07:57:53Z
department:
- _id: '630'
doi: 10.1016/j.jajp.2024.100263
intvolume: ' 10'
keyword:
- Joining by forming
- Clinching
- EN AW-6014
- Heat treatment
- Load-bearing capacity
language:
- iso: eng
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '132'
name: 'TRR 285 - B: TRR 285 - Project Area B'
- _id: '140'
name: 'TRR 285 – B01: TRR 285 - Subproject B01'
publication: Journal of Advanced Joining Processes
publication_identifier:
issn:
- 2666-3309
publication_status: published
publisher: Elsevier BV
status: public
title: Influence of the material properties on the clinching process and the resulting
load-bearing capacity of the joint
type: journal_article
user_id: '104464'
volume: 10
year: '2024'
...
---
_id: '43044'
abstract:
- lang: eng
text: Abstract. The combination of incremental sheet metal forming and high-speed
forming offers new possibilities for flexible forming processes in the production
of large sheet metal components of increased complexity with relatively low forming
energies. In this paper, the general feasibility and process differences between
the pulse-driven high-speed forming technologies of electrohydraulic and electromagnetic
forming were investigated. An example component made of EN AW 6016 aluminum sheet
metal was thus formed incrementally by both processes and the forming result evaluated
by an optical 3D measurement system. For this purpose, a forming strategy for
electromagnetic incremental forming (EMIF) was developed, tested and adapted to
the electrohydraulic incremental forming process (EHIF). The discharge energy,
the tool displacement and the pressure field of the forming zone were determined
as relevant parameters for the definition of an adequate tool path strategy. It
was found that the EHIF process is less affected by larger distances between the
tool and the blank, while this is a critical variable for force application to
the component during EMIF. On the other hand, the more uniform pressure distribution
of the EMIF process is advantageous for forming large steady component areas.
author:
- first_name: Maik
full_name: Holzmüller, Maik
id: '82645'
last_name: Holzmüller
- first_name: Maik
full_name: Linnemann, Maik
last_name: Linnemann
- first_name: Werner
full_name: Homberg, Werner
id: '233'
last_name: Homberg
- first_name: Verena
full_name: Psyk, Verena
last_name: Psyk
- first_name: 'Verena '
full_name: 'Kräusel, Verena '
last_name: Kräusel
- first_name: Janika
full_name: Kroos, Janika
last_name: Kroos
citation:
ama: 'Holzmüller M, Linnemann M, Homberg W, Psyk V, Kräusel V, Kroos J. Proof of
concept for incremental sheet metal forming by means of electromagnetic and electrohydraulic
high-speed forming. In: Materials Research Proceedings. Vol 25. Materials
Research Forum LLC; 2023:11-18. doi:10.21741/9781644902417-2'
apa: Holzmüller, M., Linnemann, M., Homberg, W., Psyk, V., Kräusel, V., & Kroos,
J. (2023). Proof of concept for incremental sheet metal forming by means of electromagnetic
and electrohydraulic high-speed forming. Materials Research Proceedings,
25, 11–18. https://doi.org/10.21741/9781644902417-2
bibtex: '@inproceedings{Holzmüller_Linnemann_Homberg_Psyk_Kräusel_Kroos_2023, title={Proof
of concept for incremental sheet metal forming by means of electromagnetic and
electrohydraulic high-speed forming}, volume={25}, DOI={10.21741/9781644902417-2},
booktitle={Materials Research Proceedings}, publisher={Materials Research Forum
LLC}, author={Holzmüller, Maik and Linnemann, Maik and Homberg, Werner and Psyk,
Verena and Kräusel, Verena and Kroos, Janika}, year={2023}, pages={11–18} }'
chicago: Holzmüller, Maik, Maik Linnemann, Werner Homberg, Verena Psyk, Verena Kräusel,
and Janika Kroos. “Proof of Concept for Incremental Sheet Metal Forming by Means
of Electromagnetic and Electrohydraulic High-Speed Forming.” In Materials Research
Proceedings, 25:11–18. Materials Research Forum LLC, 2023. https://doi.org/10.21741/9781644902417-2.
ieee: 'M. Holzmüller, M. Linnemann, W. Homberg, V. Psyk, V. Kräusel, and J. Kroos,
“Proof of concept for incremental sheet metal forming by means of electromagnetic
and electrohydraulic high-speed forming,” in Materials Research Proceedings,
Nürnberg, 2023, vol. 25, pp. 11–18, doi: 10.21741/9781644902417-2.'
mla: Holzmüller, Maik, et al. “Proof of Concept for Incremental Sheet Metal Forming
by Means of Electromagnetic and Electrohydraulic High-Speed Forming.” Materials
Research Proceedings, vol. 25, Materials Research Forum LLC, 2023, pp. 11–18,
doi:10.21741/9781644902417-2.
short: 'M. Holzmüller, M. Linnemann, W. Homberg, V. Psyk, V. Kräusel, J. Kroos,
in: Materials Research Proceedings, Materials Research Forum LLC, 2023, pp. 11–18.'
conference:
end_date: 2023-04-05
location: Nürnberg
name: 20th International Conference on Sheet Metal 2023
start_date: 2023-04-02
date_created: 2023-03-17T10:23:18Z
date_updated: 2023-05-02T11:40:24Z
department:
- _id: '156'
doi: 10.21741/9781644902417-2
intvolume: ' 25'
keyword:
- Incremental Sheet Forming
- Aluminium
- High-Speed Forming
language:
- iso: eng
page: 11-18
publication: Materials Research Proceedings
publication_identifier:
issn:
- 2474-395X
publication_status: published
publisher: Materials Research Forum LLC
quality_controlled: '1'
status: public
title: Proof of concept for incremental sheet metal forming by means of electromagnetic
and electrohydraulic high-speed forming
type: conference
user_id: '82645'
volume: 25
year: '2023'
...
---
_id: '43045'
abstract:
- lang: eng
text: The pressure fields generated by two simultaneous discharges have
not been investigated on any notable scale for the electrohydraulic impulse forming
method. In this study, the synchronicity of two discharges is ensured by the sequential
connection of two wires mounted in two spark gaps in a common volume of liquid.
The objective is to experimentally confirm the equilibrium of the energies evolved
in two spark gaps by means of pressure measurements. In addition, multipoint membrane
pressure gauges demonstrated the feasibility of easily recording detailed pressure
maps. Based on the membrane deformation mechanism and material strengthening under
static and impulse conditions, the processing procedure is further developed so
as to achieve better accuracy in the determination of pressure field parameters.
The practical equality of the pressure fields on the left and right halves of
the flat-loaded area confirms the equality of energies evolved in the two spark
gaps. The direct shock waves create zones with the most intensive loading. These
results provide a basis for the development of new electrohydraulic technologies
involving the application of two simultaneous discharges with equal energy and
pressure parameters.
article_number: '40'
author:
- first_name: Mykhaylo
full_name: Knyazyev, Mykhaylo
last_name: Knyazyev
- first_name: Maik
full_name: Holzmüller, Maik
id: '82645'
last_name: Holzmüller
- first_name: Werner
full_name: Homberg, Werner
id: '233'
last_name: Homberg
citation:
ama: Knyazyev M, Holzmüller M, Homberg W. Investigation of Pressure Fields Generated
by Two Simultaneous Discharges in Liquid Initiated by Wires. Journal of Manufacturing
and Materials Processing. 2023;7(1). doi:10.3390/jmmp7010040
apa: Knyazyev, M., Holzmüller, M., & Homberg, W. (2023). Investigation of Pressure
Fields Generated by Two Simultaneous Discharges in Liquid Initiated by Wires.
Journal of Manufacturing and Materials Processing, 7(1), Article
40. https://doi.org/10.3390/jmmp7010040
bibtex: '@article{Knyazyev_Holzmüller_Homberg_2023, title={Investigation of Pressure
Fields Generated by Two Simultaneous Discharges in Liquid Initiated by Wires},
volume={7}, DOI={10.3390/jmmp7010040},
number={140}, journal={Journal of Manufacturing and Materials Processing}, publisher={MDPI
AG}, author={Knyazyev, Mykhaylo and Holzmüller, Maik and Homberg, Werner}, year={2023}
}'
chicago: Knyazyev, Mykhaylo, Maik Holzmüller, and Werner Homberg. “Investigation
of Pressure Fields Generated by Two Simultaneous Discharges in Liquid Initiated
by Wires.” Journal of Manufacturing and Materials Processing 7, no. 1 (2023).
https://doi.org/10.3390/jmmp7010040.
ieee: 'M. Knyazyev, M. Holzmüller, and W. Homberg, “Investigation of Pressure Fields
Generated by Two Simultaneous Discharges in Liquid Initiated by Wires,” Journal
of Manufacturing and Materials Processing, vol. 7, no. 1, Art. no. 40, 2023,
doi: 10.3390/jmmp7010040.'
mla: Knyazyev, Mykhaylo, et al. “Investigation of Pressure Fields Generated by Two
Simultaneous Discharges in Liquid Initiated by Wires.” Journal of Manufacturing
and Materials Processing, vol. 7, no. 1, 40, MDPI AG, 2023, doi:10.3390/jmmp7010040.
short: M. Knyazyev, M. Holzmüller, W. Homberg, Journal of Manufacturing and Materials
Processing 7 (2023).
date_created: 2023-03-17T10:31:23Z
date_updated: 2023-05-02T11:40:35Z
department:
- _id: '156'
doi: 10.3390/jmmp7010040
intvolume: ' 7'
issue: '1'
keyword:
- impulse
- forming
- electrohydraulic
- discharge
- wire
- pressure gauge
- pressure field
language:
- iso: eng
publication: Journal of Manufacturing and Materials Processing
publication_identifier:
issn:
- 2504-4494
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Investigation of Pressure Fields Generated by Two Simultaneous Discharges in
Liquid Initiated by Wires
type: journal_article
user_id: '82645'
volume: 7
year: '2023'
...
---
_id: '30292'
abstract:
- lang: eng
text: The spinning process is a flexible incremental forming process for the manufacturing
of axially-symmetric sheet metal or tubular components with functionally graded
properties. It is characterized by the utilization of universal tooling geometries
and quite low forming forces. The process has a high potential to reduce material
waste, to extend the forming limits and to achieve more complex geometries as
well as favorable part properties [1]. Current research work at the Chair of Forming
Technology (LUF) is focused on innovative flow-turning processes that have a high
potential for producing flat components with excellent geometrical and mechanical
properties while keeping process times short [2]. In combination with process-integrated
local heat treatment, the new spinning process is predestined for the efficient
forming of ultra-high-strength steel or tailored materials. Due to the desired
field of food industry only food-safe materials such as special stainless steels
are being investigated. This paper presents an innovative machine layout as well
as an adequate process design for the production of high-performance circular
knives with optimized mechanical hardness. In this context, particular attention
is paid to various areas of temperature control as well as process-related challenges
during the process.
author:
- first_name: David
full_name: Engemann, David
id: '51720'
last_name: Engemann
- first_name: Werner
full_name: Homberg, Werner
last_name: Homberg
citation:
ama: Engemann D, Homberg W. Hot Spinning of Cutting Blades for Food Industry.
apa: Engemann, D., & Homberg, W. (n.d.). Hot Spinning of Cutting Blades for
Food Industry. Esaform 2022, Braga - Portugal.
bibtex: '@inproceedings{Engemann_Homberg, place={Braga - Portugal}, title={Hot Spinning
of Cutting Blades for Food Industry}, author={Engemann, David and Homberg, Werner}
}'
chicago: Engemann, David, and Werner Homberg. “Hot Spinning of Cutting Blades for
Food Industry.” Braga - Portugal, n.d.
ieee: D. Engemann and W. Homberg, “Hot Spinning of Cutting Blades for Food Industry,”
presented at the Esaform 2022, Braga - Portugal.
mla: Engemann, David, and Werner Homberg. Hot Spinning of Cutting Blades for
Food Industry.
short: 'D. Engemann, W. Homberg, in: Braga - Portugal, n.d.'
conference:
end_date: 29.04.2022
location: Braga - Portugal
name: Esaform 2022
start_date: 26.04.2022
date_created: 2022-03-14T07:22:43Z
date_updated: 2023-04-27T09:39:21Z
ddc:
- '680'
department:
- _id: '156'
file:
- access_level: closed
content_type: application/pdf
creator: davideng
date_created: 2022-03-14T07:19:21Z
date_updated: 2022-03-14T07:19:21Z
file_id: '30293'
file_name: PaperSuperSharp_Revision.pdf
file_size: 785105
relation: main_file
success: 1
file_date_updated: 2022-03-14T07:19:21Z
has_accepted_license: '1'
keyword:
- Cutting blades
- Flow-forming
- Incremental forming
- Hot Forming
- High strength steels
language:
- iso: eng
place: Braga - Portugal
publication_status: accepted
quality_controlled: '1'
status: public
title: Hot Spinning of Cutting Blades for Food Industry
type: conference
user_id: '83141'
year: '2022'
...
---
_id: '23465'
abstract:
- lang: eng
text: One of the main objectives of production engineering is to reproducibly manufacture
(complex) defect-free parts. To achieve this, it is necessary to employ an appropriate
process or tool design. While this will generally prove successful, it cannot,
however, offset stochastic defects with local variations in material properties.
Closed-loop process control represents a promising approach for a solution in
this context. The state of the art involves using this approach to control geometric
parameters such as a length. So far, no research or applications have been conducted
with closed-loop control for microstructure and product properties. In the project
on which this paper is based, the local martensite content of parts is to be adjusted
in a highly precise and reproducible manner. The forming process employed is a
special, property-controlled flow-forming process. A model-based controller is
thus to generate corresponding correction values for the tool-path geometry and
tool-path velocity on the basis of online martensite content measurements. For
the controller model, it is planned to use a special process or microstructure
(correlation) model. The planned paper not only describes the experimental setup
but also presents results of initial experimental investigations for subsequent
use in the closed-loop control of α’-martensite content during flow-forming.
author:
- first_name: Bahman
full_name: Arian, Bahman
id: '36287'
last_name: Arian
- first_name: Werner
full_name: Homberg, Werner
id: '233'
last_name: Homberg
- first_name: Markus
full_name: Riepold, Markus
last_name: Riepold
- first_name: Ansgar
full_name: Trächtler, Ansgar
id: '552'
last_name: Trächtler
- first_name: Julian
full_name: Rozo Vasquez, Julian
last_name: Rozo Vasquez
- first_name: Frank
full_name: Walther, Frank
last_name: Walther
citation:
ama: 'Arian B, Homberg W, Riepold M, Trächtler A, Rozo Vasquez J, Walther F. Forming
of metastable austenitic stainless steel tubes with axially graded martensite
content by flow-forming. In: ULiège Library; 2021.'
apa: Arian, B., Homberg, W., Riepold, M., Trächtler, A., Rozo Vasquez, J., &
Walther, F. (2021). Forming of metastable austenitic stainless steel tubes
with axially graded martensite content by flow-forming. 24th International
Conference on Material Forming - ESAFORM 2021, Liège, Belgium.
bibtex: '@inproceedings{Arian_Homberg_Riepold_Trächtler_Rozo Vasquez_Walther_2021,
place={Liège}, title={Forming of metastable austenitic stainless steel tubes with
axially graded martensite content by flow-forming}, publisher={ULiège Library},
author={Arian, Bahman and Homberg, Werner and Riepold, Markus and Trächtler, Ansgar
and Rozo Vasquez, Julian and Walther, Frank}, year={2021} }'
chicago: 'Arian, Bahman, Werner Homberg, Markus Riepold, Ansgar Trächtler, Julian
Rozo Vasquez, and Frank Walther. “Forming of Metastable Austenitic Stainless Steel
Tubes with Axially Graded Martensite Content by Flow-Forming.” Liège: ULiège Library,
2021.'
ieee: B. Arian, W. Homberg, M. Riepold, A. Trächtler, J. Rozo Vasquez, and F. Walther,
“Forming of metastable austenitic stainless steel tubes with axially graded martensite
content by flow-forming,” presented at the 24th International Conference on Material
Forming - ESAFORM 2021, Liège, Belgium, 2021.
mla: Arian, Bahman, et al. Forming of Metastable Austenitic Stainless Steel Tubes
with Axially Graded Martensite Content by Flow-Forming. ULiège Library, 2021.
short: 'B. Arian, W. Homberg, M. Riepold, A. Trächtler, J. Rozo Vasquez, F. Walther,
in: ULiège Library, Liège, 2021.'
conference:
end_date: 2021-04-16
location: Liège, Belgium
name: 24th International Conference on Material Forming - ESAFORM 2021
start_date: 2021-04-14
date_created: 2021-08-23T13:00:35Z
date_updated: 2023-05-02T08:27:48Z
department:
- _id: '156'
- _id: '153'
- _id: '241'
keyword:
- Flow-forming
- Spinning
- Process Strategy
- Martensite Content
- Property Control
- Micromagnetic Measurement
- Metastable Austenitic Stainless Steel
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://popups.uliege.be/esaform21/index.php?id=2759
oa: '1'
place: Liège
publication_identifier:
eisbn:
- 978-2-87019-303-7
isbn:
- 978-2-87019-302-0
publication_status: published
publisher: ULiège Library
quality_controlled: '1'
status: public
title: Forming of metastable austenitic stainless steel tubes with axially graded
martensite content by flow-forming
type: conference
user_id: '36287'
year: '2021'
...
---
_id: '21447'
abstract:
- lang: eng
text: "Even though the spectrum of parts is expected to shift over the long term
as a result of increasing e-mobility, there is still an extremely high demand
for complex components made of high-strength materials which can only be produced
by hydroforming technologies. The innovative combination of hydroforming processes
with other forming processes, as well as the improvement of the processes themselves,
offers considerable potential for improvement. \r\nA number of promising ways
of improving the hydroforming process chain are therefore the subject of this
contribution. The focus of the article is on possible approaches for combining
(incremental) pre- and post-forming operations, which can permit considerable
improvements in both quality and features at a reduced cost. Furthermore, a novel
combination of quasi-static and high-speed forming processes is presented, leading
to an improved overall forming process (with a high application potential) for
the production of complex parts. \r\n"
author:
- first_name: Eugen
full_name: Wiens, Eugen
id: '7888'
last_name: Wiens
- first_name: Eugen
full_name: Djakow, Eugen
id: '7904'
last_name: Djakow
- first_name: Werner
full_name: Homberg, Werner
id: '233'
last_name: Homberg
citation:
ama: 'Wiens E, Djakow E, Homberg W. Some ideas for the further development of hydroforming
process chains. In: Nebu/Nehy 2020. ; 2020.'
apa: Wiens, E., Djakow, E., & Homberg, W. (2020). Some ideas for the further
development of hydroforming process chains. Nebu/Nehy 2020.
bibtex: '@inproceedings{Wiens_Djakow_Homberg_2020, title={Some ideas for the further
development of hydroforming process chains}, booktitle={Nebu/Nehy 2020}, author={Wiens,
Eugen and Djakow, Eugen and Homberg, Werner}, year={2020} }'
chicago: Wiens, Eugen, Eugen Djakow, and Werner Homberg. “Some Ideas for the Further
Development of Hydroforming Process Chains.” In Nebu/Nehy 2020, 2020.
ieee: E. Wiens, E. Djakow, and W. Homberg, “Some ideas for the further development
of hydroforming process chains,” 2020.
mla: Wiens, Eugen, et al. “Some Ideas for the Further Development of Hydroforming
Process Chains.” Nebu/Nehy 2020, 2020.
short: 'E. Wiens, E. Djakow, W. Homberg, in: Nebu/Nehy 2020, 2020.'
date_created: 2021-03-11T10:50:31Z
date_updated: 2023-05-05T11:22:27Z
department:
- _id: '156'
keyword:
- Hydroforming
- Incremental Forming
- Internal Flow-turning
- High-speed Forming
language:
- iso: eng
publication: Nebu/Nehy 2020
status: public
title: Some ideas for the further development of hydroforming process chains
type: conference
user_id: '7888'
year: '2020'
...
---
_id: '19976'
abstract:
- lang: eng
text: The aim to reduce pollutant emission has led to a trend towards lightweight
construction in car body development during the last years. As a consequence of
the resulting need for multi-material design, mechanical joining technologies
become increasingly important. Mechanical joining allows for the combination of
dissimilar materials, while thermic joining techniques reach their limits. Self-piercing
riveting enables the joining of dissimilar materials by using semi-tubular rivets
as mechanical fasteners. The rivet production, however, is costly and time-consuming,
as the rivets generally have to be hardened, tempered and coated after forming,
in order to achieve an adequate strength and corrosion resistance. A promising
approach to improve the efficiency of the rivet manufacturing is the use of high-strength
high nitrogen steel as rivet material because these additional process steps would
not be necessary anymore. As a result of the comparatively high nitrogen content,
such steels have various beneficial properties like higher strength, good ductility
and improved corrosion resistance. By cold bulk forming of high nitrogen steels
high-strength parts can be manufactured due to the strengthening which is caused
by the high strain hardening. However, high tool loads thereby have to be expected
and are a major challenge during the production process. Consequently, there is
a need for appropriate forming strategies. This paper presents key aspects concerning
the process design for the manufacturing of semi-tubular self-piercing rivets
made of high-strength steel. The aim is to produce the rivets in several forming
stages without intermediate heat treatment between the single stages. Due to the
high strain hardening of the material, a two stage forming concept will be investigated.
Cup-backward extrusion is chosen as the first process step in order to form the
rivet shank without forming the rivet foot. Thus, the strain hardening effects
in the area of the rivet foot are minimized and the tool loads during the following
process step can be reduced. During the second and final forming stage the detailed
geometry of the rivet foot and the rivet head is formed. In this context, the
effect of different variations, for example concerning the final geometry of the
rivet foot, on the tool load is investigated using multistage numerical analysis.
Furthermore, the influence of the process temperature on occurring stresses is
analysed. Based on the results of the investigations, an adequate forming strategy
and a tool concept for the manufacturing of semi-tubular self-piercing rivets
made of high-strength steel are presented.
citation:
ama: Kuball C-M, Uhe B, Meschut G, Merklein M, eds. Process Design for the Forming
of Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel. Vol 50.;
2020:280-285. doi:10.1016/j.promfg.2020.08.052
apa: Kuball, C.-M., Uhe, B., Meschut, G., & Merklein, M. (Eds.). (2020). Process
design for the forming of semi-tubular self-piercing rivets made of high nitrogen
steel (Vol. 50, pp. 280–285). https://doi.org/10.1016/j.promfg.2020.08.052
bibtex: '@book{Kuball_Uhe_Meschut_Merklein_2020, series={Procedia Manufacturing},
title={Process design for the forming of semi-tubular self-piercing rivets made
of high nitrogen steel}, volume={50}, DOI={10.1016/j.promfg.2020.08.052},
year={2020}, pages={280–285}, collection={Procedia Manufacturing} }'
chicago: Kuball, Clara-Maria, Benedikt Uhe, Gerson Meschut, and Marion Merklein,
eds. Process Design for the Forming of Semi-Tubular Self-Piercing Rivets Made
of High Nitrogen Steel. Vol. 50. Procedia Manufacturing, 2020. https://doi.org/10.1016/j.promfg.2020.08.052.
ieee: C.-M. Kuball, B. Uhe, G. Meschut, and M. Merklein, Eds., Process design
for the forming of semi-tubular self-piercing rivets made of high nitrogen steel,
vol. 50. 2020, pp. 280–285.
mla: Kuball, Clara-Maria, et al., editors. Process Design for the Forming of
Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel. 2020, pp. 280–85,
doi:10.1016/j.promfg.2020.08.052.
short: C.-M. Kuball, B. Uhe, G. Meschut, M. Merklein, eds., Process Design for the
Forming of Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel, 2020.
date_created: 2020-10-12T08:30:08Z
date_updated: 2026-02-27T10:43:48Z
department:
- _id: '157'
doi: 10.1016/j.promfg.2020.08.052
editor:
- first_name: Clara-Maria
full_name: Kuball, Clara-Maria
last_name: Kuball
- first_name: Benedikt
full_name: Uhe, Benedikt
id: '38131'
last_name: Uhe
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
- first_name: Marion
full_name: Merklein, Marion
last_name: Merklein
intvolume: ' 50'
keyword:
- high nitrogen steel
- self-piercing riveting
- joining by forming
- bulk forming
- tool design
language:
- iso: eng
page: 280-285
publication_status: published
quality_controlled: '1'
series_title: Procedia Manufacturing
status: public
title: Process design for the forming of semi-tubular self-piercing rivets made of
high nitrogen steel
type: conference_editor
user_id: '53912'
volume: 50
year: '2020'
...
---
_id: '19974'
abstract:
- lang: eng
text: Due to the trend towards lightweight design in car body development mechanical
joining technologies become increasingly important. These techniques allow for
the joining of dissimilar materials and thus enable multi-material design, while
thermic joining methods reach their limits. Semi-tubular self-piercing riveting
is an important mechanical joining technology. The rivet production, however,
is costly and time-consuming, as the process consists of several process steps
including the heat treatment and coating of the rivets in order to achieve an
adequate strength and corrosion resistance. The use of high nitrogen steel as
rivet material leads to the possibility of reducing process steps and hence increasing
the efficiency of the process. However, the high tool loads being expected due
to the high strain hardening of the material are a major challenge during the
rivet production. Thus, there is a need for appropriate forming strategies, such
as the manufacturing of the rivets at elevated temperatures. Prior investigations
led to the conclusion that forming already at 200 °C results in a distinct reduction
of the yield strength. To create a deeper understanding of the forming behaviour
of high nitrogen steel at elevated temperatures, compression tests were conducted
in a temperature range between room temperature and 200 °C. The determined true
stress – true strain curves are the basis for the further process and tool design
of the rivet production. Another key factor for the rivet manufacturing at elevated
temperatures is the influence of the process temperature on the tribological conditions.
For this reason, ring compression tests at room temperature and 200 °C are carried
out. The friction factors are determined on the basis of calibration curves resulting
from the numerical analysis of the ring compression process. The investigations
indicate that the friction factor at 200 °C is significantly higher compared to
room temperature. This essential fact has to be taken into account for the process
and tool design for the rivet production using high nitrogen steel.
article_number: '100023'
citation:
ama: Kuball C-M, Jung R, Uhe B, Meschut G, Merklein M, eds. Influence of the
Process Temperature on the Forming Behaviour and the Friction during Bulk Forming
of High Nitrogen Steel. Vol 1.; 2020. doi:10.1016/j.jajp.2020.100023
apa: Kuball, C.-M., Jung, R., Uhe, B., Meschut, G., & Merklein, M. (Eds.). (2020).
Influence of the process temperature on the forming behaviour and the friction
during bulk forming of high nitrogen steel (No. 100023; Vol. 1). https://doi.org/10.1016/j.jajp.2020.100023
bibtex: '@book{Kuball_Jung_Uhe_Meschut_Merklein_2020, series={Journal of Advanced
Joining Processes}, title={Influence of the process temperature on the forming
behaviour and the friction during bulk forming of high nitrogen steel}, volume={1},
DOI={10.1016/j.jajp.2020.100023},
number={100023}, year={2020}, collection={Journal of Advanced Joining Processes}
}'
chicago: Kuball, Clara-Maria, R Jung, Benedikt Uhe, Gerson Meschut, and Marion Merklein,
eds. Influence of the Process Temperature on the Forming Behaviour and the
Friction during Bulk Forming of High Nitrogen Steel. Vol. 1. Journal of Advanced
Joining Processes, 2020. https://doi.org/10.1016/j.jajp.2020.100023.
ieee: C.-M. Kuball, R. Jung, B. Uhe, G. Meschut, and M. Merklein, Eds., Influence
of the process temperature on the forming behaviour and the friction during bulk
forming of high nitrogen steel, vol. 1. 2020.
mla: Kuball, Clara-Maria, et al., editors. Influence of the Process Temperature
on the Forming Behaviour and the Friction during Bulk Forming of High Nitrogen
Steel. 100023, 2020, doi:10.1016/j.jajp.2020.100023.
short: C.-M. Kuball, R. Jung, B. Uhe, G. Meschut, M. Merklein, eds., Influence of
the Process Temperature on the Forming Behaviour and the Friction during Bulk
Forming of High Nitrogen Steel, 2020.
date_created: 2020-10-12T08:23:27Z
date_updated: 2026-02-27T10:45:08Z
department:
- _id: '157'
doi: 10.1016/j.jajp.2020.100023
editor:
- first_name: Clara-Maria
full_name: Kuball, Clara-Maria
last_name: Kuball
- first_name: R
full_name: Jung, R
last_name: Jung
- first_name: Benedikt
full_name: Uhe, Benedikt
id: '38131'
last_name: Uhe
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
- first_name: Marion
full_name: Merklein, Marion
last_name: Merklein
intvolume: ' 1'
keyword:
- High nitrogen steel
- Self-piercing riveting
- Joining by forming
- Bulk forming
- Strain hardening
language:
- iso: eng
publication_status: published
quality_controlled: '1'
series_title: Journal of Advanced Joining Processes
status: public
title: Influence of the process temperature on the forming behaviour and the friction
during bulk forming of high nitrogen steel
type: conference_editor
user_id: '53912'
volume: 1
year: '2020'
...
---
_id: '15030'
abstract:
- lang: eng
text: Working-media-based forming processes (WMBF) represent a great potential regarding
the production of complex sheet-metal lightweight components with excellent surface
quality, shape accuracy and dimensional stability. The working-media-based forming
processes characterize the sheet-metal forming process, where the sheet metal
blank is formed during the forming process by means of a (quasi-)static or dynamic
working media pressure into a contouring forming tool. Although the WMBF offers
improved utilization of the formability of the used materials compared to conventional
sheet metal forming processes, there are limits in the production of complex deeper
or sharp edged components with (quasi-)static and dynamic WMBF processes, which
can not be overcome by using these methods alone. In order to overcome this, multi-level
WMBF process sequences for components with spherical and stepped geometries are
developed in this work. Here the developed strategies combine the advantages of
(quasi-)static and dynamic WMBF processes. Furthermore, based on analytical, experimental
and numerical investigations, innovative process management strategies were derived,
which completely compensate the local wall thickness changes, make better use
of existing material resources and thus enable the safe production of mentioned
geometries.
author:
- first_name: Eugen
full_name: Djakow, Eugen
id: '7904'
last_name: Djakow
citation:
ama: 'Djakow E. Ein Beitrag zur kombinierten (quasi-)statischen und dynamischen
Umformung von blechförmigen Halbzeugen. Düren: Shaker; 2019. doi:ISBN 978-3-8440-6723-1'
apa: 'Djakow, E. (2019). Ein Beitrag zur kombinierten (quasi-)statischen und
dynamischen Umformung von blechförmigen Halbzeugen. Düren: Shaker. https://doi.org/ISBN 978-3-8440-6723-1'
bibtex: '@book{Djakow_2019, place={Düren}, series={Paderborner Umformtechnik}, title={Ein
Beitrag zur kombinierten (quasi-)statischen und dynamischen Umformung von blechförmigen
Halbzeugen}, DOI={ISBN 978-3-8440-6723-1},
publisher={Shaker}, author={Djakow, Eugen}, year={2019}, collection={Paderborner
Umformtechnik} }'
chicago: 'Djakow, Eugen. Ein Beitrag zur kombinierten (quasi-)statischen und
dynamischen Umformung von blechförmigen Halbzeugen. Paderborner Umformtechnik.
Düren: Shaker, 2019. https://doi.org/ISBN
978-3-8440-6723-1.'
ieee: 'E. Djakow, Ein Beitrag zur kombinierten (quasi-)statischen und dynamischen
Umformung von blechförmigen Halbzeugen. Düren: Shaker, 2019.'
mla: Djakow, Eugen. Ein Beitrag zur kombinierten (quasi-)statischen und dynamischen
Umformung von blechförmigen Halbzeugen. Shaker, 2019, doi:ISBN 978-3-8440-6723-1.
short: E. Djakow, Ein Beitrag zur kombinierten (quasi-)statischen und dynamischen
Umformung von blechförmigen Halbzeugen, Shaker, Düren, 2019.
date_created: 2019-11-19T08:20:19Z
date_updated: 2022-01-06T06:52:15Z
doi: ISBN 978-3-8440-6723-1
keyword:
- High Speed Forming
language:
- iso: ger
page: '188'
place: Düren
publication_identifier:
unknown:
- ISBN 978-3-8440-6723-1
publication_status: published
publisher: Shaker
series_title: Paderborner Umformtechnik
status: public
title: Ein Beitrag zur kombinierten (quasi-)statischen und dynamischen Umformung von
blechförmigen Halbzeugen
type: dissertation
user_id: '7904'
year: '2019'
...