P 25 - Influence of different geometries and friction conditions of the profile rolling process on the residual stress distribution in cold rolled profiles
Cold profiling using the rolled profile 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 …
Content
- Publication
- 1979
- Authors
- Prof. Dr.-Ing. P. Funke, Dipl.-Ing. H. Palkowski
Cold profiling using the rolled profile 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, with sometimes 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.
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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 that influence each other. One important problem is the development of a reproducible relationship between the materials, the forming geometry and the residual stresses with the aim of producing cold profiles with a definable residual stress state as far as possible, since on the one hand residual stresses can be the cause of undesirable changes in shape, particularly during further processing, and on the other hand knowledge of the effects of such residual stresses on the load-bearing behaviour of the components is very important. On behalf of the Studiengesellschaft für Anwendungstechnik von Eisen und Stahl e.V. and with financial support from the Arbeitsgemeinschaft Industrieller Forschungsvereinigungen e.v., Cologne, the present research work was carried out by Prof. Funke, Institute for Deformation and Rolling Mill Technology at Clausthal University of Technology. Based on a research task also supervised by the Studiengesellschaft with the topic "Development of a measuring method for determining the residual stresses in cold rolled sections produced by roll forming", which was already completed last year by E.v. Finckenstein / F. Milcke, Chair of Forming Manufacturing Processes at the University of Dortmund, the influence of individual process parameters of roll forming on the residual stress curve of certain cold rolled sections could be demonstrated. In addition to confirming some of the results of earlier experiments, it was also possible to provide new suggestions for cold profiling practice. Undoubtedly, however, the realisation gained with the conclusion of this research work is particularly noteworthy, that the further necessary research into roll forming technology requires certain technical investigation prerequisites, for which suggestions were made in detail. STUDIENGESELLSCHAFT FÜR ANWENDUNGSTECHNIK VON EISEN UND STAHL e.V.
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P 25 - Influence of different geometries and friction conditions of the profile rolling process on the residual stress distribution in cold rolled profiles—
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