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Das Versuchsfeld des LUF Bildinformationen anzeigen
Temperaturüberwachung der Ölhydraulik einer Umformpresse Bildinformationen anzeigen
Thermomechanische Behandlung einer Stahlprobe (Presshärten) Bildinformationen anzeigen
Reibdrücken: Verschließen eines Rohres Bildinformationen anzeigen
Werkzeug zum Innendrückwalzen Bildinformationen anzeigen
Spanende Bearbeitung eines Umformwerkzeuges (Vorlesung Werkzeugtechnologie) Bildinformationen anzeigen

Das Versuchsfeld des LUF

Temperaturüberwachung der Ölhydraulik einer Umformpresse

Thermomechanische Behandlung einer Stahlprobe (Presshärten)

Reibdrücken: Verschließen eines Rohres

Werkzeug zum Innendrückwalzen

Spanende Bearbeitung eines Umformwerkzeuges (Vorlesung Werkzeugtechnologie)

Mitarbeiter des LUF

Frederik Dahms

Kontakt
Publikationen
 Frederik Dahms

Umformende und Spanende Fertigungstechnik

Wissenschaftlicher Mitarbeiter

Telefon:
+49 5251 60-5069
Büro:
IW1.868
Besucher:
Pohlweg 53
33098 Paderborn

Fakultät für Maschinenbau

Wissenschaftlicher Mitarbeiter - Vertiefungsberatung Fertigungstechnik

Telefon:
+49 5251 60-5069
Büro:
P1.2.19
Sprechzeiten:

Nach Vereinbarung

Besucher:
Pohlweg 47-49
33098 Paderborn

Liste im Research Information System öffnen

2022

Manufacture of Defined Residual Stress Distributions in the Friction-Spinning Process: Driven Tool and Subsequent Flow-Forming

F. Dahms, W. Homberg, Key Engineering Materials (2022), 926, pp. 683-689

<jats:p>Friction-spinning as an innovative incremental forming process enables large degrees of deformation in the field of tube and sheet metal forming due to a self-induced heat generation in the forming zone. This paper presents a new tool and process design with a driven tool for the targeted adjustment of residual stress distributions in the friction-spinning process. Locally adapted residual stress depth distributions are intended to improve the functionality of the friction-spinning workpieces, e.g. by delaying failure or triggering it in a defined way. The new process designs with the driven tool and a subsequent flow-forming operation are investigated regarding the influence on the residual stress depth distributions compared to those of standard friction-spinning process. Residual stress depth distributions are measured with the incremental hole-drilling method. The workpieces (tubular part with a flange) are manufactured using heat-treatable 3.3206 (EN-AW 6060 T6) tubular profiles. It is shown that the residual stress depth distributions change significantly due to the new process designs, which offers new potentials for the targeted adjustment of residual stresses that serve to improve the workpiece properties.</jats:p>


Manufacture of Defined Residual Stress Distributions in the Friction-Spinning Process: Investigations and Run-to-Run Predictive Control

F. Dahms, W. Homberg, Metals (2022), 12(1), 158

<jats:p>Friction-spinning as an innovative incremental forming process enables high degrees of deformation in the field of tube and sheet metal forming due to self-induced heat generation in the forming area. The complex thermomechanical conditions generate non-uniform residual stress distributions. In order to specifically adjust these residual stress distributions, the influence of different process parameters on residual stress distributions in flanges formed by the friction-spinning of tubes is investigated using the design of experiments (DoE) method. The feed rate with an effect of −156 MPa/mm is the dominating control parameter for residual stress depth distribution in steel flange forming, whereas the rotation speed of the workpiece with an effect of 18 MPa/mm dominates the gradient of residual stress generation in the aluminium flange-forming process. A run-to-run predictive control system for the specific adjustment of residual stress distributions is proposed and validated. The predictive model provides an initial solution in the form of a parameter set, and the controlled feedback iteratively approaches the target value with new parameter sets recalculated on the basis of the deviation of the previous run. Residual stress measurements are carried out using the hole-drilling method and X-ray diffraction by the cosα-method.</jats:p>


2021

Investigations and Improvements in 3D-DIC Optical Residual Stress Analysis—A New Temperature Compensation Method

F. Dahms, W. Homberg, in: Forming the Future, Springer, Cham, 2021, pp. 2249-2259

DOI


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