Self-pierce riveting (SPR) is a method of joining two or more pieces of material using a rivet, however (unlike conventional riveting) SPR does not require a pre-drilled hole.
The increasing use of coated, lightweight and high-strength materials, such as galvanised or pre-painted steel and aluminium has led industries to re-examine traditional methods of assembling components.
As welding of these materials is difficult or impossible, and assembly using conventional rivets is slow and costly, the benefits of a process, which combines high joint integrity with rapid assembly time, become obvious.
The SPR process can join sheets of dissimilar materials such as aluminium to steel, aluminium to magnesium, steel to steel, and metals to composites.
The process also delivers good static strength, producing fatigue-resistant joints that can be up to 30% stronger than spot welding.
The major market sector to take advantage of SPR technology over the last eight years is the automotive industry. Companies such as Jaguar, Landrover, Aston Martin, Ford, Daimler Cars and Trucks, BMW and Audi are using the process to join aluminium and high-strength steel vehicle bodies.
Materials are being changed to achieve weight reduction, leading to increased performance and a reduction in carbon dioxide and other emissions.
The SPR process is constantly being improved and developed for ever more challenging applications.
Henrob has engineered a range of systems including both hydraulic and electric powered tools, a range of rivet feed systems and a real-time monitoring system which gives traceable and recordable results without destroying the riveted joint.