FRIEDRICH VOLLMER FEINMESSGERÄTEBAU GMBH

The high-speed servo-hydraulic control of the mill screwdown closes the loop: The thickness values measured precise to the micrometre form the basis for quick and precise control. Vollmer offers solutions for all control concepts from simple feedback control through to complete mass flow control or Direct gap contol for rolling of wedge-shaped strip and in tandem mills. Vollmer supplies the complete control system – from the sensors through the control technology right up to the hydraulics and the cylinder – from a single source. For our customers that means having just one contact partner – in short: A one-stop solution.

Proven for decades The contact gauges that measure the thickness / width 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 for up to 9 mm strip thickness / 32 mm strip width 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. Optional the strip thickness gauge can be equipped with an additional strp width measurement unit.

Efficiency thanks to flat strip The use of flatness measurement alone without control already achieves a noticeable increase in productivity because strip breaks can be effectively prevented or the mill can be operated at the maximum possible speed for the particular unflatness. If the mill has the necessary adjusting elements, the Automatic Flatness Control (AFC) results in an effective improvement in quality. Control results of ± 4 I-units referred to the respective nominal curve are realistic. With our detailed know-how of the interplay between measurement, control and rolling mill we are on of the few manufacturers able to supply complete control systems for the strip shape – from the sensor through to the control of the adjusting elements From the pivoting of the rolls through to the combination of pivoting, bending, shifting of the intermediate rolls and zone cooling and far more – we have a command of the whole spectrum of shape control.

In addition to the strip speed, VRecoS also records up to three further tracks, such as the rolling force or the strip thickness at the ingoing and outgoing ends of the mill. The measurement protocols can be stored, printed out and distributed by e-mail. The measured values are recorded as a function of length. The recording frequency can be set with a scanning rate of 2 ms. Random lengths of strip at the leading and trailing ends (drop-off) can be suppressed, even subsequently. The signals are recorded using a data collector belonging to the scope of supply. Its electronics with input and output modules is designed for installation in switch cabinets or desks in interference-proof 24 Volt top-hat (DIN) rail technology. It transmits the data via a network cable to the Windows recording computer which can be supplied by Vollmer or by the customer.

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.