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Contribution to the modelling of stretch reducing of tubes
Author(s) -
Bernardy Paul,
Möltner Hermann
Publication year - 1996
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199605472
Subject(s) - process (computing) , rotational symmetry , finite element method , basis (linear algebra) , deformation (meteorology) , space (punctuation) , relation (database) , computer science , development (topology) , mechanical engineering , mathematics , mathematical optimization , engineering , structural engineering , mathematical analysis , geometry , geology , oceanography , database , operating system
Computer‐aided simulation is becoming more and more important for the further development of the stretch reducing mill (SRM). The available methods of calculation, however, are not satisfactory. The complete simulation of the process with a finite element method cannot yet be carried out within a reasonable time, whereas the results obtained with the help of simpler models are sometimes very inaccurate. The development of an efficient model aims at considerably improving the relation between expenditure and return as compared with the above‐mentioned methods of calculation. Based on today's knowledge of the process, fundamental extensions have been made to the known conventional SRM model. According to forming history the process model of the extended SRM model is composed of two partial models. The first partial model describes the forming process which takes place in the pass and approximates the real three‐dimensional rolling process with the help of axisymmetric elements. The second partial model describes the behaviour of the workpiece in the space between the stands. The gradual calculation of the deformation in the space between the passes is derived from the equilibrium of forces in axial direction and with the help of suitable hot stress‐strain curve functions. An efficient and fast SRM simulation program has been drawn up on the basis of this extended elementary model. The results obtained were found to correspond very well to the measuring results obtained in numerous rolling trials. The model approach described in this paper can also be applied to other longitudinal rolling processes.