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Vollmer BFI - Model VPMR -Shapemeter Rolls for Flatness Measurement
measurement for strip flatness, vital for ensuring the quality of metal production processes. These rolls replace existing deflector rolls in mill stands, and their homogeneous steel surface is adaptable, with diameters ranging from 200 to 600 mm. They are engineered for individual applications, allowing zoning widths above 17 mm and surface finishes of steel, tungsten carbide, plastic, or chrome. Integration with digital systems is facilitated through TCP/IP, enabling web-based control and monitoring across network devices. The BFI measuring rolls utilize piezoelectric pressure sensors placed under the surface, capturing strip tension distribution for reliable flatness evaluation. The design eliminates the need for slip rings, compressed air, or water, enhancing maintenance efficiency. This system is tailored for specialized challenges like wedge-shaped strips, ensuring accurate flatness measurements even under coiling-induced transversal stress.
The shape determines the quality
The BFI shapemeter rolls that we produce under licence from the VDEh-Betriebsforschungsinstitut (BFI) have a solid roll body with a homogeneous steel surface. They are normally installed instead of existing deflector rolls.
Individual adaptation
With individually manufactured diameters of between 200 and 600 mm, the BFI flatness roll can be integrated into practically any mill stand instead of deflector rolls. The outer surface of the flatness roll body is absolutely homogeneous and can be reground on all standard roll grinding machines.
The width of the measuring zones can be freely selected above 17 mm. The number of zones that the rolls have can be adapted to the specific needs of the application.
Vollmer supplies the shapemeter rolls with different surface finishes: steel, tungsten carbide, plastic or chrome. We also offer a special solution for measurements on wedge-shaped strip. It ensures that the flatness of the strips is measured correctly even though transversal stresses are created in the strip during coiling.
The digital BFI roll
The BFI flatness roll can be easily integrated into the user’s digital world: communication with the mill process control system is via TCP/IP. Parameterization of the software and the design of the display will be completely web-based in the future. Every device with a web browser in the same network as the shape computer – be it a PC, notebook, tablet or smartphone – can display the measurement data.
The principle
The BFI measuring rolls use piezoelectric pressure gauges which – spread over the width of the strip – are installed in bores under the flatness roll surface. They measure the strip tension distribution as the strip passes over the shapemeter roll.
Permanently reliable
The telemetric data transmission from the flatness roll – without slip rings – ensures reliable and practically maintenance-free operation. The BFI flatness rolls need neither compressed air nor water.