FRIEDRICH VOLLMER FEINMESSGERÄTEBAU GMBH

The radiometric gauges from Vollmer operate contact-free and measure from a safe distance. They are characterised by their extremely narrow design: With some systems the C-frame is only 120 mm wide. The X-ray systems from Vollmer have digital detectors which give them extremely low noise values. Vollmer supplies the systems with high-quality ceramic tubes and the necessary cooler. The isotope systems also have digital detectors. A particular feature of the Vollmer systems is that the radiation source is located in a special tungsten drawer that can be easily removed from the gauge. Alloy compensation is made either in the classic manner using calibration plates or alternatively at the computer according to the customer's chemical alloy analysis or simply with a small contact thickness gauge that measures the absolute thickness at the start of the pass and transmits this value to the radiometric thickness gauge.

The gauges from the VSL Series measure the form, diameter, roundness and eccentricity of the rolls during the grinding process with very high precision. Form, radial run-out and eccentricity are measures with a precision of ± 1 µm. If an interface is available, they communicate online with the controller of the roll grinding machine and thus enable even more cost-effective use of the grinding machine. With the appropriate configuration, they measure the height and lateral alignment of the roll in the grinding machine before grinding, often enabling the set-up time to be significantly reduced. Vollmer produces the automatic roll measuring gauges for both bench-mounted machines where the roll is moved along the grinding wheel and for support machines where the grinding wheel is moved along the rotating roll. Vollmer supplies the systems for a broad spectrum of roll diameters.

VGraph is the software package for the recording and visualisation of data with extensive statistical data evaluation options. It synchronously records up to 16 measurement values – for example thickness, width and speed of the strip, rolling force or strip tension – on a production line, stores them and evaluates them statistically. With statistical functions such as histograms, Cp and CpK values and error lists, VGraph provides valuable decision aids for the evaluation and further use of the coil produced. The diagnostic instruments allow optimisation of the rolling process and the line engineering. The optional FFT analysis detects periodic fluctuations in the strip thickness. VGraph meets the needs of day-to-day strip production. One example: Random lengths of strip at the leading and trailing ends (drop-off) can be suppressed – even subsequently – in the statistical evaluations.

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 the existing deflector rolls. For the measurement of wedge-shaped strip, Vollmer offers a special solution that is also based on the BFI patent. It ensures that the flatness of the strips is measured correctly even though transversal stresses are created in the strip during coiling. Individual adaptation With individually manufactured diameters between 200 and 500 mm it is possible to precisely replace the deflector rolls in practically all mills. The outer surface of the 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 measuring zones that the roll should have is determined individually.