Vernetzte Fertigung/Connected manufacturing - Considering the manufacturing history of sheet metal components when joining by forming

Wiesenmayer, Sebastian; Heyser, Per; Nehls, Thomas; Frey, Philipp; Flügge, Wilko; Meschut, Gerson; Merklein, Marion

doi:10.37544/1436-4980-2020-10-33

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regarding the properties of semi-finished and finished components, blanking operations, which are conducted prior, during and after forming, allow the determination of sheet thicknesses, mechanical properties [99] and even prestraining [100] with good accordance. However, due to the numerous influencing variables of forming operations, a mere correlation of globally recorded process data is not suitable for the reliable determination of local part properties at the joint area.…”

Section: Manufacture Of Self-piercing Rivets Using High Nitrogen Steelmentioning

confidence: 99%

Mechanical joining of high-strength multi-material systems − trends and innovations

Merklein

Jäckisch

Kuball

et al. 2023

Mechanics & Industry

Self Cite

View full text Add to dashboard Cite

In conjunction with mechanical joining processes. Mechanical joining processes play a key role for the realization of multi-material lightweight structures, which are essential with regard to environmental protection. However, joining of dissimilar high-strength materials is challenging due to the varying properties of the joining partners and due to their high flow stresses and often limited ductility. Thus, the evolution of established processes as well as the development of innovative and highly productive joining technologies are necessary. Requirements for a highly volatile production environment are versatility, flexibility, resilience and robustness. Within this contribution, current trends and innovations related to selected mechanical joining processes for enabling the material mix are outlined in order to point out opportunities to address these requirements in the future. In this context, joining using cold formed pin structures is presented as a promising approach for connecting dissimilar materials like metals to fibre-reinforced plastics. Furthermore, it is shown how the shear-clinching technology can be combined with a process-adapted application of locally limited heat treatment in order to promote the joinability and control the material flow during joining. A novel approach for reducing process forces and expanding process windows is the use of ultrasonic assistance for mechanical joining operations, which is demonstrated by the example of a nut staking process with superimposed high frequency oscillation. As concerns the widely used self-piercing riveting technique, current research activities relate not only to the further development of the joining process itself, for example by combining self-piercing riveting and tumbling, but also to the use of new rivet materials like high strain hardening stainless steels. In addition, the evolution towards mechanical joining 4.0 against the background of data-based process control in conjunction with of mechanical joining processes is also subject of the considerations.

show abstract

Section: Manufacture Of Self-piercing Rivets Using High Nitrogen Steelmentioning

confidence: 99%

Mechanical joining of high-strength multi-material systems − trends and innovations

Merklein

Jäckisch

Kuball

et al. 2023

Mechanics & Industry

Self Cite

View full text Add to dashboard Cite

show abstract

“…Due to the sensitivity of the clinching process towards aberrations of sheet thicknesses and the material strength, the process control has gained importance. In [38] an approach to determine the boundary conditions like the sheet thickness and pre-hardening as well as aberrations in previous process steps and providing the information for the clinching process is shown.…”

Section: Clinchingmentioning

confidence: 99%

Joining by forming technologies: current solutions and future trends

et al. 2022

View full text Add to dashboard Cite

The progressively more demanding needs of emissions and costs reduction in the transportation industry are pushing engineers towards the use of increasingly lightweight structures. This goal can be achieved only if dissimilar and/or new materials, including polymers and composites, are joined together to create complex structures. Conventional fusion welding processes have often been proven inadequate to this task because of the high heat input reducing the joint mechanical properties or even making the joining process impossible. Joining by forming technologies take advantage on the plastic deformation to create sound joints out of even very dissimilar materials. Over the last 25 years, several new processes, with increasing potential in effectively joining virtually every structural material, have been invented and developed. In the paper, a comprehensive overview of the most utilized joining by forming processes is given. For each process, an analysis of the current research trends and hot topics is provided, highlighting strengths and weaknesses for industrial applications.

show abstract

“…In this context, a metamodel-based analysis of the clinching process is carried out to evaluate the robustness of the clinching process based on quality-relevant geometric parameters. A non-linear correlation between pre-straining in combination with pre-hardening and the normalized maximum cutting force could be determined in [7]. The influence on the clinching process was investigated by sensitivity analyses.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Manufacturing-Induced Pre-Strain on the Load-Bearing Capacity of Clinched Joints

Bielak

Böhnke

Bobbert

et al. 2022

KEM

Self Cite

View full text Add to dashboard Cite

Background. Clinching is a conventional cold forming process in which two or more sheets can be joined without auxiliary parts. A pre-forming of the parts to be joined, which is introduced by previous manufacturing steps, has an influence on the joining result. When considering the suitability for joining with regard to the formability of the materials, the influence of the preforming steps must be taken into account. The influences of strain hardening and sheet thickness on the joining properties must be investigated. In this context, a Finite Element Method (FEM) based metamodel analysis of the clinching process was carried out in [1] to investigate the robustness of the clinching process with respect to the different material pre-strains. In [2], the method was extended to the load bearing simulation.Procedure. The metamodel from preliminary work based on various FE models, which predicts the load-bearing capacity of a clinched joint influenced by pre-straining, is compared here with experimental data and the accuracy of the metamodel prediction is discussed. For this purpose an experimental procedure was further develop which allows the preforming of metal sheets from which joining specimens can be separated with a certain degree of unidirectional deformation. In the study, the procedure for preparing the joint specimens and the results of the loading tests are presented. Different possible relevant pre-strain combinations are investigated and compared with the simulation results, to validate the FE models and choose suitable metamodel.

show abstract

Vernetzte Fertigung/Connected manufacturing - Considering the manufacturing history of sheet metal components when joining by forming

Cited by 4 publications

References 0 publications

Mechanical joining of high-strength multi-material systems − trends and innovations

Mechanical joining of high-strength multi-material systems − trends and innovations

Joining by forming technologies: current solutions and future trends

Experimental and Numerical Investigation on Manufacturing-Induced Pre-Strain on the Load-Bearing Capacity of Clinched Joints

Contact Info

Product

Resources

About