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Self-pierce Riveting

Self-pierce Riveting

 

  • There are 3300 self-piercing rivets on a Jaguar XJ

  • Every rivet costs 2 pence

  • These rivets add 4kg of weight to the car

 

The Process

Self-Piercing Riveting (SPR) is a cold forming mechanical joining process. A semi-tubular rivet is driven down by a hydraulic or servo powered punch to pierce through the top sheet(s), but only partially piercing the bottom sheet and spreading the rivet skirt under the guidance of a suitable die to form a mechanical joint.

The SPR process is important for enabling technology to facilitate lightweight manufacturing of structures. It has been used in the manufacture of fuel efficient hybrid vehicles, like Jaguar XJ, XK (aluminium structured vehicle) and other prestige models from manufacturers such as Audi, BMW, and Mercedes. The technology is also appropriate for other areas of transportation including buses, boats, seating on airplanes, caravans and recreational vehicles. It also has great potential for lightweight train vehicle assemblies.

The Benefits

  • No pre-drilled holes required
    • No alignment required
  • Low energy demands
  • No fume, no spark, and low noise
  • Allows the joining of similar and dissimilar materials
  • Surface insensitive
    • Allows the joining of coated materials
    • Allows for the ability to combine with adhesive bonding
  • Allows the joining of three or more layers of materials
  • Very high static and fatigue strength