Researchers from Southern Methodist University (SMU) have been developing a unique metal 3D printing system based on a 6-axis robot. Researchers call this method laser-based direct metal deposition (LBDMD) technology, and when combined with the school's MultiFab system, bring several new benefits compared to other common additive manufacturing methods. .

"MultiFab is a system based on a 6-axis robot and a 5-axis high-speed CNC machining center. It is highly integrated with deposition welding, laser cladding, multi-axis machining and field inspection technology. It is fast and precise for the use of metal and ceramic materials. Net shape provides a new generation of technology,” explains Professor Radovan Kovacevic of SMU.

MultiFab is also a process that combines laser technology, welding technology and CNC machining technology to create metal objects that are of higher quality than other 3D printing methods. This metal 3D printing technology is a bit like the FDM/FFF technology we often see, except that it does not extrude molten powder. Instead, it uses the LBDMD method to lay metal powder under 4 kW laser and sinter it on the spot.

This technique can actually be traced back to a patent filed in 2003 by Professor Radovan Kovacevic (click to view the patent), when he proposed a method for controlling molten metal pools in a laser process based on growth. However, recently Professor Kovacevich and SMU have just released a video of their metal 3D printing system working prototype, which uses the above technology to control the molten pool, which can produce more straight, more symmetrical lines and geometric shapes (see below) ).

Thanks to this laser technology, the MultiFab process achieves less porosity and smaller heat-affected zones when printing objects, giving you the ability to create precise geometric features, even for multi-metal manufacturing, and can be more Good control of material properties. The ability to weld in this process allows it to create objects with greater geometrical features, achieve controlled, higher deposition rates, and control heat input.

At present, both the LBDMD system and the MultiFab process are still in the process of development, but from the prototype video released by the research team, this technology has unique advantages in many aspects compared with the existing metal 3D printing technology. It can be said to have the potential to subvert the current metal 3D printing field.

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