Optimisation of the starightening process in continuous casting
During high-performance slab casting, the strand is straightened with liquid core which can cause internal cracking. This project has analysed the combined mechanisms of interroll bulging and strand unbending, which were not sufficiently known prior to this work, using numerical and experimental techniques. A complex three-dimensional finite element model of the unbending process has been developed at MPI and was used to describe Corus' slab casters CC21 and CC22 in IJmuiden in a realistic way. The model was validated with experimental investigations performed at Corus R, D & T, which include offline measurements of slab geometry and online measurements of roll forces, surface speed on several positions across the width of the slab as well as interroll bulging measurements with a newly developed scanning bulging meter. Mechanical properties of two steel grades have been measured at Corus R, D & T. A multiple beam model has been established at Corus R, D & T, complementary to MPI's model. Although with less detail, it covers the entire strand and can be run in short time. The accuracy to which such models can reflect the real casting conditions has been evaluated in this project. The numerical analysis has shown that interroll bulging strains dominate the strain profiles of CC21, whereas they are considerably lower on CC22 due to the shorter roll spacing. The capabilities of modelling may be exploited in the future for machine analysis and optimisation. Time-dependent computations have been presented which show the effects of non-stationary conditions, for example, a bent roller.
Bibliographic Reference: EUR 19850 EN (2001), pp.114. Euro: 17.50
Availability: Available by EUR-OP Sales Agents
ISBN: ISBN: 92-894-1265-8
Record Number: 200013722 / Last updated on: 2001-09-18
Original language: en
Available languages: en