The “Study of an Annular Laser Beam Based Head for 3D Metal Printing” listed among the 10 most prominent research achievements of the University of Ljubljana

date: 05.12.2018

category: Sporočila za javnost

 

During the traditional University of Ljubljana Week, the Chancellor announced the 10 most prominent research achievements of the UL. The “Study of an Annular Laser Beam Based Head for 3D Metal Printing” by the authors Prof. Edvard Govekar, PhD, Alexander Kuznetsov, PhD, Andrej Jeromen, PhD, and Matjaž Kotar, was declared one of the most prominent research achievements at the University of Ljubljana.

 

In 2018, the working group appointed by the UL Commission for Science and Research Work selected the most prominent research achievements of the University of Ljubljana, by taking into account primarily the international prominence, which is evident from quotations and the influence of the journal in which the work was published. Also affecting the selection are the completed entirety of the achievement, the interest to the wider expert and general public and the benefits of its use. The Commission treated all applications equally, regardless of the branch of science and irrespective of whether research was basic or directly applicable. 

 

ANNULAR LASER BEAM BASED HEAD FOR 3D METAL PRINTING

By forming an annular laser beam, an opto-mechanical head enables axial feeding of a metallic substance in the form of a powder or wire, and variation of the laser beam intensity distribution on the surface of the workpiece.

In addition to selective laser melting, laser direct deposition (LDD) of metal substances is one of the most promising 3D metal printing techniques. The research carried out by the group of researchers at the Faculty of Mechanical Engineering of the University of Ljubljana (Edvard Govekar, Alexander Kuznetsov, Andrej Jeromen, Matjaž Kotar) yielded a design of an opto-mechanical head for metal deposition, which by shaping an annular laser beam enables axial feeding of a metallic substance in the form of a powder or wire and variation of the laser beam intensity distribution on the surface of the workpiece. The result of the developed system is the LDD process symmetry, which not only makes the process insensitive to the direction of deposition but also contributes towards the stability of the process. The latter was demonstrated by research of laser droplet generation and deposition, which is an inherently unstable process.

The achievements presented served as a foundation for several years of further research and the development of the system and process of LDD of metallic powder and wire by use of an annular laser beam in cooperation with the Japanese company DMG MORI. The research achievements provided the basis for filing two patents and designing of a prototype LDD head, which enables laser direct deposition of powder or wire by minimum adjustments. In the case of wire deposition, a precise pre-set of the proportion of energy input into the wire and the workpiece is enabled, which has been shown to provide additional control over the stability and process outcome. In the case of laser powder deposition, the benefits are reflected in achieved powder catchment efficiency (> 80 %) and in the ability to have a decisive influence on process stability and deposited layer properties, additional to standard parameters, by adjusting the LBID .

 

Foto: Nora d.o.o.

back to list