On the influence of material properties in sheet bending processes

In order to achieve the high performance and precision requirements of modern sheet bending processes, an appropriate implementation of material properties is essential. Experiments have shown that even variations within a lot of a specific material play an important role. For this sake, detailed knowledge of the influence of the specific properties like flow curve, rolling direction, strain rate, anisotropy etc. is required. In a first step, tension tests have been performed for some materials which are frequently used in industrial applications. In order to simulate the sheet bending process, advanced simulation models have been implemented. Detailed parameter studies have been performed, and the essential parameters and their influence on the bending process have been found out. The results have been compared to measurement results of the bending process

Solving an inverse problem concerning the sheet metal blank geometry in an industrial application to minimize the processing time

This paper concerns the optimization of an industrial sheet metal forming process on an automatic panel bender from Salvagnini Maschinenbau GmbH combined with a corner former from an external company. By combining these two machines and optimizing the sheet metal blank geometry, production is much cheaper and faster because one processing step is eliminated

A Comparison Between Commercial and Open-Source Software for Finite Element Analysis of Elasto-Plastic Bending

Nowadays, simulation is becoming more and more important in industries. Here we consider a typical industrial application in the field of sheet metal bending. A high number of simulations is necessary during the development process to perform parameter studies and optimizations. On the other hand, simulation tools should be also available for the customers of these machines, e.g., to plan the production of very specific profiles. In such cases, the optimal process parameters only can be found by simulation. Very important in this context are the license costs for commercial simulation software. Frequently, the simulations are not limited by computational power but by the number of available licenses, such that the duration for parameter studies is elongated. Also, with license costs it very expensive to provide a simulation platform to the customers. The presented case study has been carried out with the goal of comparing possible open source alternatives to expensive commercial Finite Element software. Exemplarily, we consider the elasto-plastic bending of a cantilever, using the Johnson Cook constitutive law. For this test case, a three dimensional Finite Element analysis is performed, comparing the results of open-source software (Salome-Meca) and a com mercial counterpart (Abaqus). Different element types and mesh sizes are compared, the usability of both tools, and the computational time. Considering the obvious price difference, both platforms show comparable results. Comparing the functionality of both programs, both are capable for modelling highly detailed and complex models for elasto-plastic material processing. However, for under standing the structure of the user interface of Salome-Meca is far more time consuming. Additionally, the performance of Salome-Meca on different operating systems is com pared: Salome-Meca on Linux, Salome-Meca on Linux, installed in a virtual machine on Windows, and finally Salome-Meca on Windows. All in all, it turned out that depending on the specific application Salome-Meca can be a powerful alternative to Abaqus for the considered industrial application

LEAN PANEL BENDER – Einige mechanische Aspekte der Modellierung in Echtzeit für Produktion in Losgröße 1

Nachfolgend werden einige wissenschaftliche Aspekte der Echtzeit-Materialerkennungsstrategie MAC diskutiert, die in der neuen Maschinenfamilie LEAN PANEL BENDER der Firma Salvagnini Maschinenbau realisiert ist und die eine hochpräzise und hocheffiziente Herstellung von komplex geformten Blechprodukten sowohl bei Losgröße 1 als auch in der Serie erlaubt.(VLID)342339

Advanced mechanical simulation models for automatic panel benders

With automatic panel benders complete products are manufactured from sheet metal. In order to achieve short cycle times with high flexibility, a deep insight into the non-linear bending process is required. For this reason, efficient mechanical simulation models have been implemented, combining Finite Element Method, multibody dynamics simulation tools, contact mechanics algorithms and substructuring. Scope of this work is the comparison of several simulation models with measurement results performed on a Salvagnini P4XeD automatic panel bender

Industrial application of advanced adaptive concepts for automatic panel benders

Recently, the requirements on sheet metal production processes have increased significantly. Highest precision and flexibility with efficient energy consumption and short cycle times can be achieved by advanced concepts only. This requires a deep insight into the non-linear bending process. For this sake, efficient simulation models have been implemented to model the bending process: two and three dimensional finite element models combined with multibody simulation tools, contact mechanics algorithms and substructure techniques. The simulation tools have been successfully calibrated by measurement results. With the obtained detailed process knowledge, new adaptive concepts have been introduced, e.g. a smart crowning system in order to achieve straight profiles. The industrial application has shown the advantage of utilizing the above mentioned techniques. The straightness of the bends has been significantly increased, while energy consumption and cycle times have been reduced. Secondly, the development time of new machine concepts has been drastically reduced, such that the first prototype can be transferred to series production within short time. Moreover, the applied strategies show a large potential for future developments

Influence of rate dependent plasticity on a sheet metal bending process

The high demands on precision and quality of industrial sheet metal forming processes are increasing steadily. Therefore, more and more effects concerning the machines but also the material behaviour of the workpiece must be considered. Here, we consider an automatic panel bender of Salvagnini Maschinenbau GmbH. In this application, it turned out that the speed of bending is a relevant influence factor. Goal of this work is to estimate the influence of strain rate on bending forces and the shape of the bent profile

Bairisch-österreichische Dialektliteratur vor 1800

Literatur in und mit Dialekt war auch vor 1800 ein wesentlicher, prägender Bestandteil der Elite-, Alltags- und Komplementärkultur im bairisch-österreichischen Sprachraum. Christian Neuhuber, Stefanie Edler, Elisabeth Zehetner präsentieren erstmals die wichtigsten Ausdrucksformen, Arbeiten und Autoren, kontextualisieren die bislang überwiegend nicht edierten Werke aus einer Vielzahl an Archiven und Bibliotheken und stellen sie in aktuelle kulturwissenschaftliche Forschungszusammenhänge.Literatur in und mit Dialekt war auch vor 1800 ein wesentlicher, prägender Bestandteil der Elite-, Alltags- und Komplementärkultur im bairisch-österreichischen Sprachraum. Christian Neuhuber, Stefanie Edler, Elisabeth Zehetner präsentieren erstmals die wichtigsten Ausdrucksformen, Arbeiten und Autoren, kontextualisieren die bislang überwiegend nicht edierten Werke aus einer Vielzahl an Archiven und Bibliotheken und stellen sie in aktuelle kulturwissenschaftliche Forschungszusammenhänge

Similarity methods in elasto-plastic beam bending

In industrial metal forming processes a large number of parameters has to be considered. As is well known, this number can be reduced by a non-dimensional representation. Based on the example of an elasto-plastic cantilever beam, the non- dimensional form is derived in the framework of the Bernoulli-Euler theory. In the second step, a Finite Element analyis of a drop-test experiment is performed, and the results are presented in non-dimensional form. The results illustrate the advantage of the normalization

Material models for highly dynamic metal forming processes

Nowadays, industrial processes like sheet metal bending or punching are performed with high precision. Further optimizations are only possible by simulation and appropriate material models and parameters. Goal of this work is to find a material model suitable for both, bending and punching processes, including the effects of plasticity at high strains and strain rates. The models are calibrated by material tests like tension or torsion tests