The removal of unfused powder is a central step in the postprocessing of metal parts made using additive manufacturing. For years, market-leader Solukon’s systems have removed powder automatically from parts manufactured with LPBF processes. A project with Reichenbacher Hamuel GmbH is now taking it a step further and automating both unpacking from the container and depowdering in a single system.
After the LPBF process, the printed part is in a kind of “powder cake” of unused metal powder in a container. Unpacking the part, i.e., freeing the part from the powder cake, generally involves vacuuming and clearing away powder. Once the part is uncovered and removed from the container, it is placed in a Solukon system in order to automatically remove any unfused metal powder from the interior of the complex part. Using programmable two-axis rotation and vibration, the powder becomes fluid and can flow out of the interior channels in a controlled manner. This is how the powder is usually removed from complex laser-melted metal parts. The Reichenbacher – Solukon project steps in here, combining the two process steps in an automated system for the first time.
The operating principle of the combined unpacking and depowdering station
It is essential to the Reichenbacher – Solukon project that not the part alone, but rather the entire container in which the part sits is loaded into the SFM-AT1000-S. The Reichenbacher box, which has a removable bottom and sides, is secured via a zero point clamping system, then rotated upside-down, and the first of the loose powder from the powder cake is emptied automatically. Discharged powder is fed directly into an external material preparation station.
Then, the user removes the box frame with an external mobile lifting device or crane, so that the part is fully accessible. The Solukon system (short swivel arm version) then cleans the part as usual using one-of-a-kind SPR technology® with programmable two-axis rotation and adjustable vibration. With the SPR-Pathfinder® software, the motion sequence in the Solukon system can be calculated in advance easily and automatically using the part’s CAD file. The SFM-AT1000-S can accommodate boxes up to 800 kg and, with the help of a high-frequency knocker, can loosen even stubborn powder clumps in the part’s interior channels.
“The SFM-AT1000-S with box unpacking is a project with a high degree of automation. Furthermore, it demonstrates how flexibly our systems can be used for individual customer solutions. We are happy to support Reichenbacher in their project unpacking boxes of laser-melted metal parts. This is how, together, we create a real competitive edge for Reichenbacher’s customers,” says Andreas Hartmann, CEO and CTO of Solukon. Together with Reichenbacher’s Additive Manufacturing Team, led by Dr. Alexander Kawalla-Nam, this has led to an industry-ready automation solution in record time. “With Solukon, we once again have a system in our portfolio that has a truly unique selling point and makes us stand out in the area of postprocessing against standard solutions on the AM market. This puts Reichenbacher in a position to map the entire 3D printing process chain. We thank Mr. Hartman and team for their openness and fast execution of the project,” Dr. Kawalla-Nam adds.
The SFM-AT1000-S for combined unpacking and depowdering is now available from Reichenbacher. Solukon is participating as system vendor.
Industrial customer already using combined system
The SFM-AT1000-S has already successfully passed its box unpacking field test. A leading manufacturer of steel molds for the concrete industry has already been using the system for months.