Andritz Sundwig supplies Shape Control System for NLMK

(PresseBox) ( Hemer, )
Andritz Sundwig, Hemer, Germany, a member of the Andritz Group received an order from Novolipetsk Steel company (OJSC "NLMK"), Lipetsk, CIS to supply a shapemeter system for a tandem line for the production of silicon steel strips. The scope of supply also includes a sectional selective roll cooling system, a drive system for the shapemeter roll as well as the turnkey integration of the system's components into the rolling line.

For more than 24 years now, the experienced rolling mill manufacturer Sundwig has built shapemeter systems according to the BFI system. So far, approximately 390 rolling lines have been equipped with more than 700 shapemeter rolls. The great number of shape measurement and control systems in use shows that the system has proven very well in various cases of application.

In this case, with strip temperatures of more than 200°C, the newly developed shapemeter roll type with completely closed, gap-free and homogeneous roll surface was used. The advantages of this type of design are:
- avoidance of damage to the strip surface,
- coating possibilities with wear-resistant materials, e.g. tungsten carbide,
- simple installation of the force sensors in axially running bores,
- no requirement of calibration of the shapemeter roll on the site.

With the shapemeter roll, high gradients of the strip shape in the strip edge area are optimally determined by sensor distances of only 25mm. The simple and rugged design of the solid measuring roll body as well as the maintenance-free roll electronics with digital, optical rotary transmitter guarantee highest precision and operational safety.

The PC-based, modularly designed computer system for the shape measurement, control and visualization communicates via customized interfaces with the line control.

The model predictive control system developed by Andritz and applicable on all rolling lines can predict the future control behaviour of the process by means of an integrated model and clearly improves the control quality compared to a conventional PID controller. The shape actuators are pilot controlled in order to improve the control result, especially at the strip head and the strip tail end.
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