In collaboration with industrial partners, the Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM in Bremen has developed a new quality assurance method for monitoring the surfaces of fiber reinforced plastics prior to adhesive bonding. Following successful technology transfer, this innovative method will be demonstrated at JEC Europe 2014 in Paris from 11-13 March. The new Bondinspect® method will be presented at the fair by Automation W+R GmbH (Stand N79, Pavillon 7/39).
Lightweight aircraft and cars are designed using components made of carbon fiber reinforced plastic (CFRP).
The manufacture of these CFRP components is carried out in metallic molds. Demolding is generally facilitated by treating the molds beforehand with a release agent.
However, some release agent adheres to the molded product and these residues must be removed manually prior to subsequent coating or bonding.
Contamination of CFRP surfaces by release agent residues impairs adhesion and hence the quality of bonded joints. So how can such residues be detected on components?
Automated monitoring of CFRP surfaces
Fraunhofer IFAM scientists have developed an automated aerosol wetting test suitable for industrial production. This wetting test efficiently inspects the surfaces of large components during the production process.
An ultrasonic atomizer first of all generates a defined water aerosol. This then creates a characteristic pattern of droplets on the component surface that is being inspected. A camera system records these droplets and shows them on a screen.
The droplet size distribution allows statements to be made about the wetting properties of the surface. By defining target values, for example, the cleaning and activation effect of a surface pretreatment step can be automatically monitored.
The advantage of the aerosol test is that large surfaces, for example fiber composite components for aircraft and wind turbines, can also be tested. The water aerosol dries within a very short time and leaves no residues, meaning the components can be further processed shortly after inspection.
Martina Ohle | Fraunhofer-Institut
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