Over the past ten years, Lockheed Martin Aeronautics – Palmdale, CA has been deploying the use of statistical process control methods in the machining of composite honeycomb components. The on-machine probing and real-time data collection has eliminated the variability prevalent within aerospace fabrication and assembly processes. The results have been zero defects, closing the knot on the final elements of the digital thread. The change started with a realignment of the corrective action function to focus on the process, not the discrepant parts. Quality tools were used by Manufacturing Engineering to monitor machine performance. Particular attention was paid to centering the process within the part tolerances and specification limits. Indices like CP, a measure of dispersion, and CpK, a measure of dispersion and centeredness were tracked for every part. Tracking of the sigma level by part number was initiated and sources of variability were easily identified and corrected. A key element in the success of the change was the availability of real-time process performance information to the craftsmen on the shop floor. Early detection and immediate reaction assured a reliable process that was readily adopted and has sustained the test of time. This AeroDef presentation will detail the successful deployment of manufacturing process control for high speed core machining and the shop floor use of statistical process methods on the Joint Strike Fighter program.
- Deployment of manufacturing process control for high speed core machining
- Shop floor use of statistical process methods for F-35
- Quality tools used to monitor machine performance