The air conditioning ducting market is split into two levels where ducting flange joining is concerned. The high volume, high strength ducting applications tend to use the pierce rivets approach. The low volume, low strength market typically uses clinching, riv-bonding, pop rivets and spot welding.
Taking into account the overall costs of the process and the cycle times, Henrob Self Pierce Riveting (HSPR) still works out to be the most cost effective solution. Fire dampers and sound attenuators are ideal applications for SPR where the advantages of joint security, no hole drilling and swarf are key factors.
HSPR is considered a structural rivet or engineered rivet giving the customer the reassurance of a quality product. The clinch process is seen as less robust and for H&S issues it is now becoming less commonly used as a joining process. The same can be said for blind fasteners such as pop rivets.
Other manufacturers in the H&V industry are taking advantage of self pierce rivets Air conditioning manufacturers for example are assembling heavy duty fans where the fatigue benefits of HSPR is the key driver. Other products assembled with HSPR include, air diffusers, roof ventilators, louvers, large housings and cabinets for air conditioning units.