Additively Manufacturing a Large Component with a Small Work Envelope
Airbus successfully reduced the weight of an aircraft partition by redesigning it for additive manufacturing. The large component was produced in pieces, with connection features built-in.
Direct metal laser sintering (DMLS), an additive process that builds parts by laser sintering layers of metal powder, makes it possible to create parts with mesh or lattice structures that reduce weight while maintaining strength. However, the relatively small build envelopes of powder-bed DMLS systems mean that the large parts that could benefit most from weight savings can't be made complete inside of these machines.
Aircraft maker Airbus recently found a workaround for this challenge, successfully direct metal laser sintering the frame of a partition for A320 aircraft that separates the passenger compartment from the galley. The original solid aluminum alloy frame was redesigned for additive manufacturing with lattice-like structures that reduced its weight by 45 percent. However, the nearly 7-foot-tall frame is much larger than the envelopes of the additive machines that were used to produce it.
How was it done? The large component was grown in pieces that could fit inside a DMLS machine. These pieces included built-in connection interfaces to ease assembly.
Learn more about the approval process for the partition and how production will advance in this article from Additive Manufacturing, sister publication to Modern Machine Shop.
Simple process considerations can increase your productivity in milling titanium alloys.
Though it won’t replace high speed machining, Boeing sees “low speed machining” as a viable supplement to higher-rpm machines. Using new tools and techniques, a shop’s lower-rpm machining centers can realize much more of their potential productivity in milling aluminum aircraft parts.
Passivation—the process for making stainless steel parts more corrosion-resistant—is affected by how well the part is cleaned. It’s also affected by the choice of acid. Nitric or citric?