Slab wedge gauge

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HiWEDGE is a non-contact laser optical system for direct on-line measurement of the wedge and width of hot and cold slabs or plates. When located up-stream of the roughing mill, the HiWEDGE can provide information to the rougher control to minimize camber and to clearly identify any profile shape change.

HiWEDGE is specifically designed to accurately measure the profile of a slab or plate on both edges. The system accurately determines the wedge, thickness and width of the profile. The early recognition of slab profile shape is essential for top quality product, due to fast adjustment to caster to correct any shape defects. HiWEDGE utilises two measurement towers, both located close to the slab edges and each containing two laser sources with associated high-resolution CCD cameras. The images from the laser lines are acquired by the cameras and processed using proprietary algorithms to determine both the profile as well as the respective dimensions. Each pair of optical heads is installed in a special tower structure mounted on a trolley tunning on rails to automatically adapt the system to different slab or plate sizes. HiWEDGE provides the edge profile and the wedge dimensions, including 3 width position measurements. Information provided by the system can also be used at the caster to improve process control, due to the possibility of an early detection of possible casting problems. HiWEDGE system can be installed at the exit of slab casters or in the entry area to roughing mills.


  • Real-time display of edge shape and slab/plate dimensions
  • System flexibility to cover a wide range of products
  • 100% side shape evaluation and slab width measurement
  • Automatic calibration
  • Standard industrial interfaces
  • High measurement accuracy and repeatability in both hot and cold conditions
  • No physical contact with rolled product
  • Very high reliability
  • Immunity from product vibration and transversal movement
  • Minimal maintenance requirements
  • Faster set-up of rolling mill
  • Control of camber in the rolling mill
  • Reduced start-up times
  • Quick information of possible process drift


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