In automotive body-in-white welding, lightweight designs have made threaded joints increasingly common. Large sheet-metal parts with curved surfaces, however, suffer from poor hole-position consistency. Post-weld distortion further aggravates misalignment.

Traditional remedy
Add an industrial camera to re-locate every hole. Planar cameras can handle XY offsets, but cannot correct spatial angle errors (bolt axis not perpendicular to the surface), causing torque alarms. Moreover, every photo costs cycle time. As takt rose from 30 JPH to 60 JPH, camera delays and hardware expense became unacceptable.

Danikor solution – Floating-socket tightening for hex-head bolts
The tightening module combines “blow-feed + vacuum-hold” with a spring-loaded floating socket. When the hole is off-position, the socket self-aligns within a 0.5–2.5 mm envelope, finds the thread and drives the bolt home—without vision.

Key benefits

1. Higher success rate
   Floating travel compensates for hole deviation and surface-angle error, ensuring reliable thread engagement and eliminating false torque alarms.

2. Cost & takt-time reduction
   • No industrial cameras, lower line cost.
   • Larger part tolerances are acceptable, cutting component cost.
   • Vision-free cycle delivers faster, more stable takt.

3. Simpler operation
   • No camera-to-robot calibration or troubleshooting.
   • Plug-and-play floating socket shortens commissioning and boosts overall productivity.