STRIP SHAPE MEASUREMENT WITH MEASUREMENT ROLL

 

Vollmer shapemeter rolls follow a BFI patent. The massive roll body is equipped with
piezoelectric pressure gauges. The telemetric data transmission and power supply results in
an almost maintenance free operation (no slip rings). The diameter, body length and bearing
of the shapemeter rolls correspond exactly to those of the deflector rolls.

Roll diameters down to 200 mm enable a precise replacement of the deflector rolls in almost
all mills.

The advantages are obvious:

– No additional space required for the shapemeters
– No effects on the strip passline

While the strip is pulled over the shapemeter rolls, a variety of discreet measurement
zones measures the strip tension distribution. At the same time, the monitor indicates the
desired shape for the current strip. If the mill has the suitable control components, the
shape is controlled in accordance with the requirements of the end customer (refer to Strip
shape control).

An important factor for the design of the shapemeter rolls is the selection of the number
of measurement zones for the rolls. The more measurement zones, the more precise the
detection of the shape profile, but also the more expensive the measurement rolls. Our
experts will be glad to give their advice at any time, based on decades of shape
measurements on running strip material in mills of all types and on strips of all
materials.

Roll surfaces: Steel, chrome, plastics or tungsten carbide

Shapemeter Roll (BFI) – Leaflet for download (German/English)

 Planheit_BFI.pdf (544 KB)

 

NON-CONTACT MEASUREMENT OF STRIP SHAPE

Only 200 mm free view onto the strip are sufficient for VIP 08, the optical shapemeter. 200 measurement zones over the strip width offer a brilliant resolution. VIP 08 can be applied with strip tensions of up to 70 N/mm².

Wide range of application:

– Hot rolling mills
– Tension levellers
– Inspection lines
– Shearing lines
– and others

 

Optical Shape Measurement – Leaflet for download (German/English)

 VIP08.pdf (371 KB)

 

STRIP SHAPE CONTROL

AFC (Automatic Flatness Control)
The AFC works through other mill control components than does the strip thickness control.

With a suitable servohydraulic mill screwdown system that may be retrofit into installed
into older mills and usually exists on new mills, a strip thickness control will achieve
the required results.

The effectiveness of the strip shape control depends largely on the type of control
components that are installed in the mill. The basic control components are: Roll tilting,
roll bending, intermediate roll shifting and zone cooling.

Roll tilting is available in all but certain cluster mills. Not all mills have roll bending
units (positive and negative). The intermediate roll shifting is only available on 6 high
mills and certain special cluster mills. An efficient zone cooling can be added to many 4
high and 6 high mills.

The strip shape control can only use the control components that are installed by the mill,
so that the success of the strip shape control depends on the configuration of the mill.
Vollmer shape controls use all existing control components.

Strip shape measurement with or without control
Even with a limited availability of control components, meaning a limited control
potential, the shape measurement has great advantages for the user. Knowing the current
strip condition enables the adaptation of the rolling conditions to the shape situation. In
the case of poor strip shape, strip breaks can effectively be prevented. In case of strip
with a uniform tension distribution, the mill can be operated with high efficiency. Strip
shape measurement has always resulted in a productivity increase.

 

Signal Analysis by FFT (Fast Fourier Transformation)

The FFT analysis option offers a product showing recurrent periodical strip thickness
variations both during the strip thickness measurement (on-line, 2D) and after completion
of the coil (off-line, 3D) so that our copper customers, rolling material for the coaxial
cable production, will recognise which coils can be applied for which coaxial cable
standards.

Our steel customers use the FFT instrument for preventive maintenance and fault finding in
the mill (the wave length of the recurrent strip thickness variation indicates which
roller, which roll or which bearing requires maintenance).

FFT Analysis – Leaflet for download

 FFT_en.pdf (239 KB)

 

SPECIAL MEASUREMENT TASKS

The measurement dimensional factors on strip products is not limited to the measurement of
the strip thickness, strip width and strip shape.
A variety of technical solutions has been developed at our plant due to new challenges by
our customers.

– Curvature measurement,
– Groove measurement on profiled strip,
– Foil sample measurement,
– Cross profile measurement (off-line)

are just some of the many solutions that started as special inquiries and are now well-
tried in the industry.

Such challenges help us to get on and extend our limits continuously and help our customers
find a solution. We appreciate any special measurement task. Please get in touch with us.

VBP Cross Profile Measurement – Leaflet for download (German/English)

 VBP.pdf (1.77 MB)