Lights Out Cell Automatic Tool Change Solution for Nut and Collar Anvils with Integrated Fastener Feed Hardware

Paper #:
  • 2017-01-2097

Published:
  • 2017-09-19
Author(s):
Affiliated:
Abstract:
Installation of collars and nuts onto interference-fit bolts requires complex anvil hardware on the wet side of the spar or wing panel. Many Electroimpact machines are capable of automatically changing riveting and bolting anvils, but operator involvement is required to connect fastener feed equipment. This is unacceptable in a lights-out cell, but is difficult to eliminate. That’s because the nut and collar anvils must be able to rotate with the machine C axis, which rotates about the Z axis. This means that rotation capability must also be built into the fastener feed system. Newly installed lights-out cell machines are equipped with a “Spinner” assembly which rotates with the machine C axis. The Spinner consists of an individual feed path for each size and type of fastener to be fed rotating inside of a stationary annulus. Air is blown into two points in each Spinner path to convey the fasteners along the inner diameter of the annulus. Each rotating path is sealed against the stationary annulus with a felt cord energized by a strip of urethane foam. Nuts and collars are pneumatically fed to the Spinner paths, roll along the interior diameter of the annulus, and are redirected out of the annulus by a plastic scoop which rotates with the C axis. The scoop delivers the fastener to an anvil-mounted assembly which receives the fastener and uses air to blow it to the tool point for installation.
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