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13. March 2020

AUTOMOTIVE: PRODUCTION OF CAR BONNETS

13 identical clinch pliers set 79 clinch joints

For the production of engine bonnets, clinching technology has been THE joining method for decades. The cold forming joining system can join different material partners as well as additional adhesives as sealing or strength adhesives in a process-safe way. For weight reasons, the main components of a bonnet, the outer and inner panels are mainly made of aluminium and are usually combined with hinges and lock reinforcements made of sheet steel. All clinching pliers are equipped with online process monitoring systems. Fully automatic – clean – low-noise – energy efficient – process safe.

A huge global tier-one company has been relying on clinching systems from BTM for years. For the production of engine hoods for a southern German premium manufacturer, engine hoods of the well-known high quality have to be produced in a cycle of 60 seconds. 9 reinforcing brackets had to be clinched to the inner sheet layer. All components are made of aluminium sheets, but the sheets have different thicknesses.

As a specification for standardization and cost-saving maintenance, a pliers type was selected which can work on the robot as well as be used stationary via two screw-on possibilities on the pliers bracket, which can be fixed in position.

Pneumohydraulic clinching units with 100mm stroke, 60kN press force and 350mm throat depth were used.
The 5.5 Tog-L-Loc clinching tool from BTM was selected as the joining point.

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