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EMG hotCAM: confirmed operational readiness & new orders

EMG hotCAM has proven its value in the daily production

EMG hotCAM: encapsulated camera module

We last reported on the online measuring system EMG hotCAM about two years ago. In the meantime, the system has proven its value in the daily production and it therefore seems sensible to summarise the essential points that speak in favour of using an optical system for measuring the position of the moving strip in the hot rolling mill.

For the process reliability in a hot rolling mill, it is extremely important to maintain a defined position of the strip between the rolling stands. In this respect, the constant online measurement of the strip position enables an optimised adjustment of rolling force and gap.

The continuous control of the centre position in the finishing line also reduces the occurrence of cobbles, which lead to serious damage and production stops. In reversing stands, an optimised control of the rolling force and the rolling gap leads to a reduction of the camber and thus to the avoidance of collisions between the strip and the mechanical strip guidance of the roller table.
Knowledge of the strip position between all or at least several stands is therefore crucial for the smooth operation of a hot rolling mill.

What is EMG hotCAM all about?

EMG hotCAM is exceptional in two respects in terms of technical know-how. On the one hand, this applies to camera technology, because CMOS (Complementary Metal-Oxide-Semiconductor) area scan cameras are used. CMOS cameras are insensitive to the so-called "blooming effect" (overload of sensor sensitivity and response of adjacent pixels) and deliver good images under a wide variety of lighting conditions. The camera is completely encapsulated in a housing flooded with compressed air. The compressed air ensures a "continuous flushing" of the lens via a specially designed airflow control block (3D print). The lens area is automatically closed as soon as no compressed air is available. This means that regular cleaning of the lens is not necessary even under very harsh environmental conditions.

On the other hand, specially developed algorithms in the software ensure that even image sequences with disturbances due to environmental influences can be processed correctly and that correct strip edge detection is possible. Only the thermal radiation of the strip is taken into account. This results in an image of the band, which stands out clearly and rich in contrast to its surroundings, i.e. compared to the infrared radiation of the band/slab, the environment is dark.

And does it all work successfully?

After more than 5 years of operation at the DSP1 hot rolling mill near TATA in Ijmuiden, the Netherlands, all doubts have been dispelled. The system is now being installed on the second hot strip mill at TATA Ijmuiden, has been running successfully for more than two years at thyssenkrupp Steel in Bochum and will soon be used at Baosteel Meishan, China. EMG hotCAM users usually equip at least 3 stands of a finishing line with camera modules. In some cases, however, 7 or 8 stands are equipped with cameras in a finishing line.

You want to know more about EMG hotCAM? Perhaps you have completely different ideas for using the hotCAM technology? Please feel free to contact our sales organisation or our product management directly under:, visit our website or have a look at our hotCAM video.


1Direct Sheet Plant