From the Build Plate to a Finished Part: Cleaning Complex Ti-6Al-4V Lattices
Industry — Metal Additive Manufacturing / 3D Printing Service Bureau
The Challenge — Powder Trapped in Places No Brush Can Reach. A contract additive manufacturing service bureau producing patient-specific medical implants and aerospace brackets from Ti-6Al-4V powder faced a costly post-processing bottleneck. Laser-powder-bed fusion leaves fine, partially sintered powder adhered to every external surface and, critically, packed inside internal lattices, cooling channels and hollow struts. Manual blasting damaged thin walls and altered critical dimensions; solvent and aqueous rinsing barely penetrated the narrowest passages. Any retained powder represented a biocompatibility or fatigue-failure risk for the end application. The bureau needed a high-throughput, non-destructive method to remove loose and adhered powder uniformly across every part, regardless of geometric complexity.
The ACMESONIC Solution — 40 kHz Sweep Cavitation Plus a Validated Two-Stage Process. The bureau installed an ACMESONIC Ultrasonic Cleaner with a 40 kHz sweep-frequency system, whose constantly shifting ultrasonic frequency prevents standing-wave dead zones and ensures energy reaches every recess of the lattice geometry. Parts are first placed in a custom basket and run through a heated (60°C) aqueous detergent wash using a 20-minute sweep cycle — cavitation agitates and detaches adhered powder without stressing thin struts. A second short rinse cycle in deionized water flushes liberated particles away from the structure. The tank's 0.5-micron recirculation filtration continuously removes suspended powder from the bath, preventing re-deposition and extending fluid life. ACMESONIC engineers worked with the bureau to lock the process parameters into a repeatable digital recipe, complete with cycle logging for traceability and customer quality documentation.
The Outcome — Consistent Cleanliness Across Every Build. Post-process inspection using microscopy and weighed residue tests showed a greater than 99% reduction in residual powder mass, including inside channels previously considered unreachable. Manual post-processing labor dropped sharply, and the risk of dimensional change from blasting was eliminated. The repeatable, documented process helped the bureau satisfy customer and regulatory requirements for implantable and flight-critical components. With the cleaning bottleneck removed, the service bureau now processes larger and more geometrically ambitious builds with confidence — knowing that geometry is no longer an obstacle to cleanliness.
