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VERSION:2.0
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 27
SUMMARY:New results and extended thickness range for online MFL inspection of flat products
DESCRIPTION:Cold rolled steel plate contains a variety of defects. Some optically visible defects cannot be reliably classified by OIS due to missing depth information. Defects not protruding trough the material surface, like non-metallic inclusions (NMI), are invisible for optical inspection systems and can disturb further processing. Therefore, a complete online inspection for hidden defect detection is required to ensure proper material quality, prevent disturbances during further processing and enable defect root cause identification by augmenting OIS data.
A proven detection method for hidden defects in ferromagnetic materials is magnetic flux leakage, which is widely used as magnetic powder testing. IMS extended this method to moving material by developing an online MFL inspection system using GMR magnetic field sensors which generate a complete magnetic image of the strip (inclusion detection System – IDS). The generated images are processed by an advanced processing software which reliably finds defects in the background noise and enables their classification based on configurable features.
The position of the magnetic field sensors is automatically adapted to varying material thickness. Optical and capacitive sensors permanently check the strip for folds and monitor the gap between the sensors and the material. In case of line disturbances, a rapid retraction of the sensors is contrived by spindle and pneumatic drives. The latter also allows to move the system out of line for maintenance. All relevant elements are liquid-tempered for operation under various ambient conditions. 
While initially being developed for thin cold rolled plate, tests have shown the suitability of the IDS for usage on thicker material. A promising sensitivity was achieved for thicknesses of up to 2 mm, opening up new applications like automotive cold rolled plate.
This paper and presentation show the concept and implementation of this inspection method as well as results for various types of defects and materials.

CLASS:PUBLIC
DTSTART:20230615T094000
DTEND:20230615T100000
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