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hotCAM – Optical position measurement on hot strip

The hot rolling process is typically a combination of a reversing stand (roughing stand) and a finishing line with several roll stands.

To ensure process reliability in a hot rolling mill, it is extremely important to maintain a defined position of the strip between the roll stands. The continuous measurement of the strip position enables an optimum adjustment of the rolling force and rolling gap.
In reversing stands this leads to a reduction of the camber of the strip and thus prevents collisions of the strip with the mechanical strip guiding rail.

Continuous control of the centre position in a finishing line also reduces strip guiding cobbles, which could otherwise result in serious damage and interruptions to the production process.

Performance features:

  • A CMOS area scan camera takes near infrared (NIR) pictures of the hot strip; minimum strip temperature 820°C
  • Strip edges are reliably detected
  • Mathematical algorithms compensate for interference, such as mist, dust and steam
  • The software accurately calculates the position, width and camber of the strip

Customer benefits:

After realising a closed control circuit (sensor and rollers) based on the measured values generated by EMG's hotCAM system, you, as the system operator, will be able to benefit from the following advantages:

  • Optimum strip positioning in the rolling mill
  • Control of the centre position through optimised adjustment of the rollers
  • Reduction of cobbles between the roll stands
  • Prevention of collisions between the strip and the mechanical strip guiding rail
  • Reduction of roller and strip damage
  • Optimisation of coil quality

For further detailed information regarding position measurement and technical data, please refer to our product brochure.


EMG hotCAM Movie