Thin sheets are coated electrostatically with oil or wax in a final production step just before coiling. The thickness of the oil film is specified by the purchaser. Contrary to the past, modern multi-range oils no longer serve solely as corrosion protection, but also as a lubricant in the forming process. The process stage of renewed oil lubrication before forming can therefore be dispensed with. In order to achieve good forming results it is particularly important to apply a homogeneous layer of oil without dry stripes and in the required thickness.
Previously, it was not possible to ensure that the oil had been correctly applied during the production process. The oil layer could only be measured offline by means of complicated laboratory measurements or hand-held devices.
AMEPA GmbH has now launched for the first time the OFM 100, a measuring system which measures, visualises, reports and documents the oil and wax layer online using a non-contacting method. Oil layer defects are immediately detected and reported. Corrections can be initiated at once. The quality of the oiling of each coil is documented in its entirety.
The system can be employed in the exit or entry inspection. It is also possible to check that oil has been removed, for example before painting.
SRM – Online Surface Roughness Measurement
Surface roughness of cold rolled sheets is an important parameter for the finishing process. Up to now, online roughness measurement was only possible with systems measuring in rolling direction. AMEPA developed a new optical system enabling a measurement under 45° or 90° - as stipulated by SEP 1940 and DIN EN ISO 4287/4288 - for all kinds of textures.
The targets of the SRM System are:
- Visualization and documentation of the roughness over the coil length
- Timely detection of roughness out-of tolerance levels caused by e.g.:
- wear of rolls
- improper roll forces
- Providing online data to determine the optimal point to change the rolls
- Providing Ra as input for the roll force controllerReduction of the number of offline measurements