Application of Additive Manufacturing to Large Caliber Armament Systems

Armaments, especially large caliber armaments, tend to be complicated, highly loaded, and low production rate items. The complicated geometries and low rates of production lends itself to additive manufacturing (AM). One extremely attractive benefit of AM is the ability to print at the point of need. This ability can greatly simplify the logistics train and will help units stay in the fight even when cut off from resupply. However, until recently the high material property requirements and physical size have made converting these parts to AM impractical.
One current AM effort is a 155mm muzzle brake. This brake is currently cast with long lead times and a significant portion require rework. The part is roughly 33 inches long, 15 inches tall and 20 inches wide. Attempts have been made to manufacture this brake via Electron Beam Additive Manufacturing, Wire Arc Additive Manufacturing, and Laser Powder Bed Fusion (LPBF). Additionally, an effort was made to optimize the design and print it using LPBF.
Another effort is focused on evaluating bound metal printing as possible means of fabricating at the point of need. A Foreign Comparative Test is underway to compare bound metal solutions from Markforged, BASF, Rapida and others. The program consists of printing coupons and conducting material property testing to compare these different materials / systems. Parts will then be fabricated, and field tested.
Additional efforts are underway to replace several recoiling steel parts with AM versions made via LPBF. Here the goal is to help with supply chain issues by developing an AM version that can be printed multiple vendors.
This presentation will go over these and other efforts currently underway at the Combat Capabilities Development Command (DEVCOM) Armaments Center along with their goals, progress, and future plans.