Electroimpact Riveting

Automatic C-Frame Riveter

In an Automatic C-Frame Riveter the rivet position is controlled by a CNC control running a part program. The part is held in a barge that moves the part from rivet location to rivet location. For these machines the X and Y axes are on the C-Frame.

• Panel Capacity: 3.5–10 m panels; straight or tapered curvature; 17 panel styles without removing form boards
• Tooling: Picture-frame holder with 4 linear-rail form boards and removable index plates for fast reconfiguration
• Access / Travel: ±50° A-axis, ±10° B-axis, up to 10 m X-travel
• Loading: Frame lowers to floor and rotates 90° for loading/unloading
• Automation: Auto drill and anvil tool changers; pneumatic pressure foot retract; integrated chip vacuum & fastener injection
• Fastening System: Electric servo squeeze for up to 1/4″ fasteners with stack thickness measurement & dynamic squeeze control
• Controls: Siemens or Fanuc CNC (this machine developed on Siemens platform)

• Application: ARJ21 wing panel fastening (stringers and buttstraps) — scalable to A320/737 panel size range
• Fastener / Process Capability: Auto-feed and install LGPS, Briles, and slug fasteners with drill, countersink, seal, drive, collar-swage, coldwork, ream, and shave operations
• Throughput: ~16 slug rivets per minute in a drill-upset-shave cycle
• Head Architecture: Independent 4-axis fastening heads with full CNC alignment — eliminates yoke structure used on earlier LVER machines
• Cycle Time & Efficiency: High-speed tools, short tool stroke, and non-contact sensors designed for fast throughput and unattended operation
• Structural / Foundation Impact: 70–80% weight reduction versus earlier LVER machines with new bed design reducing foundation requirements
• Controls: Custom CNC interface with mode-specific displays and software alignment control of fastening heads