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CAD renders of each of the 3 specific parts printed: projectiles, receivers, and barrels.
More research is needed to determine if additive-manufactured munitions are viable for the Department of Defense. Demonstration is needed to prove the capability of aluminum parts utilizing the powder bed fusion method of manufacturing. The specific problem the team is facing is understanding, defining, and replicating the parameters necessary to produce high-performing, user-friendly, and safe man-launch projectiles for combat missions.
The main objective of this project was to demonstrate, using the 40mm platform, that additive manufacturing (AM) processes were applicable to Armament products. The goal was to create and demonstrate an AM printed 40mm low-velocity training round munition and a 40mm grenade launcher. The demonstration showcased the AM capabilities of the U.S. Army Armament Research Development and Engineering Center (ARDEC) and their application in the manufacturing of armaments.
Prior to producing the parts using AM, coupled thermal-mechanical simulations were conducted using AutoDesk Project Pan software by Penn State. Simulations were utilized to ascertain thermally induced distortion and to identify potential corrective measures for the AM process. After analyzing the simulation and introduction of corrective measures, the grenade bodies were produced using AlSi10Mg powder by Penn State. Penn State produced parts using a 3DSystems ProX320 powder bed system and CalRAM used a twin laser SLM 280 powder bed system.
Video footage captured the AM build process for the grenade bodies, receivers, and barrels. Video footage was also taken during the post-process machining and was edited not to exceed 4 minutes. The part drawings representing the grenade body, receiver, and barrel were revised based on the information gained during the manufacturing demonstration.
The project team successfully met the project objectives. In total, 20 projectile bodies, 3 barrels, and 3 receivers were printed using the additive manufacturing method of powder bed fusion. Optimization of processing parameters for the ProX320 for AlSi10Mg was vital to the success of printing these parts. The team used the Netfaab Simulation software to obtain fast and accurate physics-based simulations used to predict thermal distortion, which led to a reduction in build failures. Optical comparator analysis was completed by slicing barrels from early builds to check for surface defects. In a comparison of 3D Systems and SLM parameters, it was found that 3D Systems had better internal quality, while SLM had better surface quality. Video footage of the printing and post-processing steps was obtained to be inserted in an ARDEC Project Video.