Working Principle of Riveting Machines

1. Compression Riveter (for Solid Rivets)

Process:

Insert a solid rivet into a pre-drilled hole.

The factory head is supported by a bucking bar or die below.

A riveting head applies high pressure to upset the protruding shank.

The shank plastically deforms, filling the hole and forming a second shop head.

Core: Uses static pressure to create a permanent mechanical lock.

1. Blind Rivet Gun (for Pop Rivets)

Process:

Insert a blind rivet into the hole.

The tool’s jaws grip the rivet’s mandrel.

The gun head pulls the mandrel back while reacting against the rivet body.

This pulls the mandrel head, expanding the rivet body on the blind side.

At a preset force, the mandrel snaps at its break notch.

Core: A pulling action on the mandrel from one side to achieve blind-side fastening.

III. Orbital/Radial Riveter (for Precision Riveting)

Process:

Position the workpiece and rivet.

A spinning riveting head applies pressure while its tip rolls in a controlled path.

The rivet material flows plastically under this combined rolling and pressing action.

A smooth, precisely formed rivet head is created.

Core: Uses a rolling/forming action for uniform, high-quality deformation.

In summary, different riveting machines use force—applied as pressure, pulling, or spinning—to plastically deform a rivet, creating a permanent joint between workpieces.