Umformtechnische Herstellung komplexer Karosserieteile

Birkert, Arndt; Haage, Stefan; Straub, Markus

doi:10.1007/978-3-642-34670-5

Cited by 65 publications

(35 citation statements)

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“…This paper assesses the modelling of geometrical welding (geowelding) which defines the dimensional accuracy within the joining process, so-called geo-welding. In these stations the components to be joined are clamped in a precisely defined position to each other, compare [1]. As the single components may have deviations within the permitted limits the geometrical configuration could oppose the positioning set up by the geo-station, as schematically shown in Fig.…”

Section: Problem Statement and Motivationmentioning

confidence: 99%

Valuable Use-cases towards a Generic Model of Geo-station Welding

et al. 2014

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To ensure a robust mass production, the automotive industry relies on computer aided tolerancing to guarantee the dimensional quality of the vehicles' body-in-white. One of the challenges for computer aided tolerancing is the accurate modelling of the positioning for joining processes in the body-in-white production. The research work presented in this paper analyses three use-cases, on which different approaches of modelling of the so-called geo-stations are investigated, aiming at improving the deviation prediction based on the geo-station modelling. The examples show that the measurement values are met most accurately, if the positioning processes of the geo-station are taken into account as the dominant impact factor in the simulation.

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Section: Problem Statement and Motivationmentioning

confidence: 99%

Valuable Use-cases towards a Generic Model of Geo-station Welding

et al. 2014

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“…Common forming simulations refer to a rigid behavior of the underlying tool geometries [1], particularly when the focus remains on the interaction among the tool's active components. Many forming simulation environments offer the usage of elastic deformations for the dies, since regarding Robert Tehel robert.tehel@iwu.fraunhofer.de 1 Fraunhofer IWU, Reichenhainer Straße 88, 09126 Chemnitz, Germany the tools, compliancy yields an increase in accuracy as exemplarily probed by Neto et al [7] or Pilthammar et al [11] for drawing processes and by Chen et al [4] for a stamping process. Furthermore, this step demands only little effort, since the exact geometry of the forming tool is available as CAD data.…”

Section: Elasto-mechanical Characteristics Of Forming Machinesmentioning

confidence: 99%

Effective FE models for simulating the elasto-mechanical characteristics of forming machines

Tehel

Päßler

Bergmann

2020

Int J Adv Manuf Technol

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The elasto-mechanical characteristic of forming machines is crucial for a variety of forming processes. Numerical simulations are to be performed to understand the complex interaction between process, forming tool, and machine. The machine's elastic fingerprint depends on its design, accuracy of the components, and mounting conditions. Models only based on data of the machine design are limited. Therefore, effective FE models are to be developed to transfer the physical structure into a digital representation. The paper presents different methods of creating effective models for the characteristics of forming machines determined by measurements. Examples and potential of using these models are presented.

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“…If all zones were included into the FE model and an equidistant FE discretization is applied, the minimum element edge length (l E min ) is very small (Figure 7(a)). However, the common element edge length for complete vehicle crash simulations is currently about 3 ••• 5 mm [11]. For most of the LSS, HSS and AHSS, the properties of the MZ and the HAZ can be merged, and thus only two zones with passable element sizes must be considered (Figure 7(b)).…”

Section: Numerical Design Of Laser-strengthened Structuresmentioning

confidence: 99%

“…That applies especially to multipleused modular car body designs, vehicle derivatives or adjustments in series production (e.g. variations in material quality) to meet the quality requirements [11]. Minor adjustments of conventional production technologies mostly induce high efforts and costs because of their low manufacturing flexibility.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Steel Car Body Structures via Local Laser-Strengthening

Wagner¹,

Jahn²,

Beyer³

et al. 2016

ENG

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Continuously rising demands of legislators require a significant reduction of CO 2-emission and thus fuel consumption across all vehicle classes. In this context, lightweight construction materials and designs become a single most important factor. The main engineering challenge is to precisely adapt the material and component properties to the specific load situation. However, metallic car body structures using "Tailored blanks" or "Patchwork structures" meet these requirements only insufficiently, especially for complex load situations (like crash). An innovative approach has been developed to use laser beams to locally strengthen steel crash structures used in vehicle bodies. The method tailors the workpiece hardness and thus strength at selected locations to adjust the material properties for the expected load distribution. As a result, free designable 3D-strengtheningpatterns surrounded by softer base metal zones can be realized by high power laser beams at high processing speed. The paper gives an overview of the realizable process window for different laser treatment modes using current high brilliant laser types. Furthermore, an efficient calculation model for determining the laser track properties (depth/width and flow curve) is shown. Based on that information, simultaneous FE modelling can be efficiently performed. Chassis components are both statically and cyclically loaded. Especially for these components, a modulation of the fatigue behavior by laser-treated structures has been investigated. Simulation and experimental results of optimized crash and deep drawing components with up to 55% improved level of performance are also illustrated.

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Umformtechnische Herstellung komplexer Karosserieteile

Cited by 65 publications

References 0 publications

Valuable Use-cases towards a Generic Model of Geo-station Welding

Valuable Use-cases towards a Generic Model of Geo-station Welding

Effective FE models for simulating the elasto-mechanical characteristics of forming machines

Design and Optimization of Steel Car Body Structures via Local Laser-Strengthening

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