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Thursday, 19 September 2019
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Raw materials & technologies, Applications

A new method bonds light-weight materials

Wednesday, 15 October 2014

With a bonded bolt composites, thin sheet metals, plastics and other materials are equipped with a multi-purpose connection element.

The adhesive is cured within about 4 seconds using an LED lamp. Source: Delo

The adhesive is cured within about 4 seconds using an LED lamp. Source: Delo

Böllhoff and Delo have developed an innovative joining method. With a bonded bolt called "Onsert", composites, thin sheet metals, plastics and other materials are equipped with a multi-purpose connection element. Both companies have tested this technology in a series of pilot projects. The last one was about fixing of cables, claddings and other components of the BMW i3. After this technique has proven its capabilities in series production, it will now be launched.

Developed for the automotive industry, aviation and white goods

Composite materials, such as CFRP and GFRP, take established joining technologies including welding, screwing and riveting to their limits. This technology based on stud welding combines bonding and screwing by equipping fastening elements, such as threaded metal bolts, with a transparent plastic base and bonding it to fiber composite materials. The threaded rod of the "Onsert" can be screwed and – when necessary – removed again.

The special feature of this technique is its speed. The adhesive is cured within about 4 seconds using an LED lamp. It is possible to fully automate this process. The bonded connection can be loaded immediately. Bonded bolts with a base diameter of 25 mm achieve a pull-off strength up to 2,000 N on CFRP. When applying higher forces, a predetermined breaking point in the base ensures that the laminate of the composite material remains intact and no fibers are torn out. Nevertheless, the technology are robust as shown by salt spray and VDA climate tests.

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