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After rolling and cooling, rails exhibit considerable degree deviations and residual stresses. Roller levelling brings these into the tolerance range required by the customer, but results in a less favourable residual …
After rolling and cooling, rails exhibit considerable degree deviations and residual stresses. Roller levelling brings these into the tolerance range required by the customer, but results in a less favourable residual stress state. The subject of this research project was the simulation of roller straightening of rails on the basis of a theoretical numerical model and corresponding experimental investigations. To summarise, it can be said that the experimental and theoretical investigations presented in this final report have come a significant step closer to the goal of computationally understanding the development of residual stresses occurring during roller straightening.
However, the question of the extent to which the knowledge gained can be put into practice cannot yet be answered conclusively. The work was carried out at the Ruhr University Bochum by the Institute of Structural Engineering, headed by Prof Dr Wunderlich, using test results from Krupp Stahl AG. Findings on this subject obtained at Thyssen Stahl AG have been incorporated into this report. The project was accompanied by a working group consisting of gentlemen from the relevant industry. We would like to thank all those involved for their work. STUDIENGESELLSCHAFT STAHLANWENDUNG e.V.
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P 100 - Development of characteristic values for the production of cold rolled profiles from the point of view of economical production of dimensionally accurate profiles Cold profiling using the roll forming process is a forming process that has been used industrially for over half a century. It allows the production of cold-formed profiles with consistent and high dimensional accuracy, some with sharp-edged bends, many curved sections, complicated double folds, with - if desired - targeted work hardening of the starting material and finally the combination of profile shaping with further processing steps such as punching, beading and bending. Although the diverse requirements and the general technical development of mechanical engineering have led to a wide variety of roll forming systems over the course of time, the technology of roll forming is still largely based on practical experience. This applies both to the dimensioning of production facilities and to the design of forming tools. This unsatisfactory situation can probably be explained essentially by the fact that the entire process - in addition to the rather difficult geometric relationships of forming - is governed by numerous working conditions which influence each other. For this reason, the Technical Committee of the German Cold Forming Association has been working closely with a well-known plant manufacturer for several years on the development and dimensioning of a machine and drive concept for research purposes. A machine and control technology solution was developed and realised which for the first time makes it possible to empirically investigate the interactions between the parameters of the production process and the properties of the product in a reproducible manner. This research work was carried out on behalf of the Studiengesellschaft für Anwendungstechnik von Eisen und Stahl e.V. by Prof. Dr.-Ing. D. Schmoeckel, Institute for Forming Technology at Darmstadt Technical University. In addition to confirming some of the results of earlier investigations, new findings of practical relevance were obtained. This applies in particular to the experiments on slip reduction, which resulted in a drastic saving in the energy used, and on the relationship between the quality of the finished product and the selected forming strategy. These results represent a step towards a better understanding of the complex manufacturing process, but at the same time demonstrate the need for further intensive efforts to conduct in-depth research into roll forming technology. The research project was funded by the Federal Ministry of Research and Technology (BMFT) and was supervised by Kernforschungsanlage Jülich GmbH (KFA) as the project sponsor for the raw materials research programme. STUDIENGESELLSCHAFT FÜR ANWENDUNGSTECHNIK VON EISEN UND STAHL e.V. Publication: 1986 Authors: Prof. Dr.-Ing. D. Schmoeckel, Dipl.-Wirtsch.-Ing. U. Eichler
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