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Coiltech Pordenone is the leading trade fair in Italy in the coil winding industry and focuses on materials and machines used in the production of electric motors, generators, transformers and coil windings. The trade fair registered more than 3000 international guests in 2023 with great emphasis on mobility and energy generation. Together with Metalservice, voestalpine presented the latest news about self-bonding varnish, as well as innovations in the field of electrical steel and isovac® priming services.
The World Magnetic Conference also took place at the Pordenone fair, where Dr. Karin Niederwimmer, Technical Quality Specialist in the field of electrical steel at voestalpine, presented to an interested auditorium for the first time a new method for the assessment of varnish leakage in stacks using self-bonding varnish.
The two most important quality criteria for stacks using self-bonding varnish are high adhesive strength and the absence of varnish leakage on the edges of the stack. International standards apply to the determination of adhesive strength. Varnish leakage is evaluated visually by production personnel and is subjective and is influenced by external factors such as lighting etc.
Intensive research and development have been dedicated to this issue at voestalpine, and a very effective solution to the problem has been devised.
Laser triangulation is used to create a 3D point cloud on the front side of the bonded test specimen. Heretofore hardly recognizable excess material in the adhesive bond, which may be indicative of a varnish leak, are visualized and detected automatically. False assessments, for example caused by reflections in microscope images, are excluded.
Dr. Karin Niederwimmer clearly explained the great advantages of this test method as compared to conventional visual assessment. Impermissible material behavior is detected automatically, reproducibly and thus highly reliably. This objective initial inspection of material coated with self-bonding varnish at voestalpine reduces processing issues to zero. We would say: 0% troubles
