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  • 23-Mar-2012 04:44 EDT

Orbital Drilling Machine for One Way Assembly in Hard Materials

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In Aeronautic industry, when we launch a new industrialization for an aircraft sub assembly we always have the same questions in mind for drilling operations, especially when focusing on lean manufacturing. How can we avoid dismantling and deburring parts after drilling operation? Can a drilling centre perform all the tasks needed to deliver a hole ready to install final fastener? How can we decrease down-time of the drilling centre? Can a drilling centre be integrated in a pulse assembly line? How can we improve environmental efficiency of a drilling centre? It is based on these main drivers that AIRBUS has developed, with SPIE and SOS, a new generation of drilling centre dedicated for hard materials such as titanium, and high thicknesses. The first application was for the assembly of the primary structure of A350 engine pylons. The main solution that was implemented meeting several objectives was the development of orbital drilling technology in hard metal stacks. Indeed, like in other materials (CFRP, Aluminum) this drilling process provides a lot of advantages. For example: Thrust force reduction; no burrs generated between parts; compatible with minimum quantity lubricant. Success of this project, and the opportunity to built primary structure in one way assembly, will allow us to reduce assembly lead time of A350 pylon by 7% and avoid the need to employ four workers in non value added tasks (Dismantling end deburring parts). This paper presents all work carried out on this project, and its integration in the A350 Pylon assembly line.

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Damien Van Damme, Airbus

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11VATC81403
Orbital Drilling Machine for One Way Assembly in Hard Materials
2011-10-21
ORBITAL DRILLING MACHINE FOR O
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Video
2012-03-23
This article characterizes the special features of drilling of CFRP/Titanium and -Aluminium stacks. Simplified theoretic models will show how CFRP/Titanium stacks should be machined without scratches and burn marks contacting carbon. Low axial forces and smart chip removal technology are the main characteristics of the drilling tool technology, optimized to reach H8 quality in one shot operation. Presenter Peter Mueller-Hummel, Cutting Tools Inc.
Video
2012-03-16
With the growing use of carbon fiber composite structure in Aircraft Manufacturing, the challenge of drilling carbon fiber stacked with Titanium has become a focus point. Due to the abrasive nature of the carbon fiber (CF), cutting tool life is relatively short when drilling carbon fiber stalked with Titanium. A common drill wear indicator is exit burr formation in the Titanium. As drilling tools wear due to the abrasive nature of the CF, the exit burr in the in the Titanium increases. This study seeks to understand the factors that lead to tool wear and exit burr formation. A correlation may be made relating drilling thrust forces with exit burr formation. Different cutting tools geometries and materials are studied using a high speed camera to attempt to understand the factors influencing exit burr formation. Findings are optimized and tested. Decreasing exit burr in the drilling of CF and Titanium may increase tool life thereby reducing tool costs to airframe manufacturers.

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