LDED Multi-Axis metal AM that doesn’t need support structures
A collaborative team from Promation, Module Works, and Multi-Scale Additive Manufacturing (MSAM) Laboratory of the University of Waterloo have developed and successfully tested a new method for manufacturing overhang geometries without the need of support structures.
By eliminating support structures, a team from team from Promation, Module Works, and Multi-Scale Additive Manufacturing (MSAM) Laboratory of the University of Waterloo was able to simplify process planning and reduce waste material. The tests were conducted at the University of Waterloo in Ontario, Canada using Laser Directed Energy Deposition (LDED).
Parts with geometric overhangs, such as pipes with bends, pose a special challenge for additive processes that deposit material in horizontal layers. To deposit material in the overhang area of the bend, the process needs to incorporate support structures that allow the layers to extend beyond the pipe. This works well enough but incorporating support structures adds time and effort to production planning and creates extra waste material.
To simplify and speed up the LDED process, Promation, Module Works, and MSAM teamed up to develop a new method that deposits the layers in non-horizontal planes. The printing nozzle is mounted on a 6-axis robotic arm to ensure it always remains tangent to the deposition surface which is automatically tilted using a 2-axis positioner. Applying deposition layers to a tilted surface enables pipe bends and other overhang geometries to be printed without support structures, which simplifies production planning and reduces waste material.
In the laboratory tests, the team used the new method to manufacture a pipe with a 45° bend with no support structures. The new method was also used to successfully print a closed hollow dome.