Proven for decades
The contact gauges that measure the thickness of the strip with an accuracy of a few micrometres are renowned for their outstanding precision and exceptional reliability: Almost 2000 systems that have gone into operation worldwide in recent decades are still in use even today.
They still form an integral part of the measurement technology in new plants where the highest precision is demanded.
Flexible from 0.01 to 24 mm
Tactile measurement is employed at all stages of the strip production process – on the annealing line and during rolling, on the finishing line or during strip processing as well as in the steel service centre. Vollmer delivers the systems in different versions for thicknesses from 0.01 to 24 mm.
Precise even on wavy strip
With a measuring precision of down to one micrometre per millimetre of strip thickness, they meet the demands of modern rolling mills. Contact gauges adapt to the strip passage and follow any waviness of the material. They thus compensate angular errors by actively adjusting the sensors perpendicularly to the wavy strip material.
The principle - The technology in detail
The thickness is measured by using extremely precise transducers to calculate the distance between the two sensors which touch the upper and lower surfaces of the strip. The advantage of this method is that – as with the laser – the thickness is measured irrespective of the alloy. Material parameters do not have to be entered and updated.
Vollmer uses crowned measuring sensors made from diamond, one of the hardest materials employed in industrial applications. When the gauge is in its parking position during changing of the coils, the sensors touch one another and the system performs automatic zeroing.