| 摘要 |
A spar assembly jig for tack-free positioning of aircraft spar components for subsequent fastening at a second location. Pneumatically operated clamps are mounted on the frame of such jig. The spar components are laid up in such jig and the clamp closed thereon to hold the members together as opposed to the prior art method of securing such components together by temporary fasteners or tacking. The assembly jig and so-assembled and clamped spar components are then transported by overhead crane to an automatic riveting machine. The riveting machine has a jaw defined by a spindle and anvil which fits above and below the jig assembly. The clamps have a swing-away feature such that as the spindle and anvil approach, the clamp swings out of the way so that such machine can drive a rivet through endcap and web at or near the spot vacated by the swing-away clamp. The machine then moves on and the clamp re-closes on the spar components. After riveting of the spar components is completed, the jig assembly and so-fastened spar therein can be lifted off the riveting machine and transported away by overhead crane to storage or to the next work station, which promptly frees up the riveting machine for another operation.
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