Online prediction and optimisation of shape of cold rolled sheet for better dimensional control

Abstract

The dimensional quality of cold rolled sheets is very important for its usage in automotive, packaging and white goods industries. To predict strip shape a partial least square (PLS) regression model has been developed and validated with actual plant data. The model was then used to optimise the process parameters to reduce the magnitude of shape errors. The most important parameters responsible for shape defects have been identified from a large number of input process parameters. With the help of the model it has been found that apart from the tensions and the speeds at different stands, the levelling of the last stand plays an important role in controlling the strip shape. The model can be used online, and is useful for plant operation.

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References

Timoshenko

S. P.

Gere

J. M.

: ‘Theory of elastic stability’, 2nd edn; 1961, Singapore, McGraw Hill Book Company.

Hollander

Hurkmans

: Proc. 5th Int. Rolling Conf. on ‘Dimensional control in rolling mills’, London, UK, September 1990, The Institute of Metals, 33–45.

Tellman

J. G. M.

van Steden

ter Lingen

: Proc. 5th Int. Rolling Conf. on ‘Dimensional control in rolling mills’, London, UK, September 1990, The Institute of Metals, 260–269.

Saito

Ohnishi

Komatsu

Miyoshi

Matsumoto

Kitahama

: Proc. 5th Int. Rolling Conf. on ‘Dimensional control in rolling mills’, London, UK, September 1990, The Institute of Metals, 56–62.

Kajiwara

Fujino

Nishi

Nihei

: Proc. of Int. Conf. on ‘Advances in cold rolling technology’, London, UK, September 1985, The Institute of Metals, 115–121.

Frees

E. W.

: ‘Data analysis using regression models – the business perspective’; 1996, Englewood Cliffs, NJ, Prentice Hall.

Fox

: ‘Regression diagnostics (Quantitative applications in the social sciences series)’, 12; 1991, Thousand Oaks, CA, Sage Publications.

STATISTICA ver 7.0: Statsoft Inc., Tulsa, OK 74104, USA, 1984–2003.

Hattori

Maeda

Nose

Tsubono

: Proc. 5th Int. Rolling Conf. on ‘Dimensional control in rolling mills’, London, UK, September 1990, The Institute of Metals, 559–569.

10.

Hillier

F. S.

Lieberman

G. J.

: ‘Introduction to operations research’, 7th edn; 2001, New Delhi, Tata McGraw-Hill.

11.

LINGO Industrial ver. 9.00: Lindo Systems Inc., Chicago, IL 60622, USA, 2004.