Victor Lubkowitz, M.Eng.

  • 76131 Karlsruhe
    Kaiserstraße 12

Victor Lubkowitz, M.Eng.

Area of Research:

  • Additive manufacturing by using selective laser melting

 

 Projects:

  • Innovations Campus: Local optimization of component properties through specific adjustment of the porosity in the SLM process

 

Curriculum Vitae:

since 09/2019

Research Associate at the Institute of Production Science (wbk) at Karlsruhe Institute of Technology (KIT)

since 01/2017

Organisation of the VDE E-Race (erace-v.de)

10/2017-08/2019 

Master Study: Development and management in mechanical engineering and automotive engineering at the university of applied sciences Coburg

09/2013-06/2017

Bachelor Study: Mechanical engineering at the university of applied sciences Stralsund

08/2009-07/2011

Apprenticeship: Electrician, specialising in energy and building technology

Publications

[ 1 ] Lubkowitz, V.; Alber, J. & Zanger, F. (2021), "PBF-LB Process-Induced Regular Cavities for Lightweight AlSi10Mg Structures", Materials, vol. 14, no. 21, 10.3390/ma14216665
Abstract
In powder bed fusion with laser beam (PBF-LB), two process-induced defects by pore formation are known: local spherical pores by the keyhole effect and geometrically undefined pores caused by lack of fusion. Both pore types are heterogeneously distributed and can be used for lightweight or damping design applications. The achievable porosity is limited to around 13%. This article presents a novel process-controlled method enabling the targeted and reproducible manufacturing of solid parts with regularly distributed cavities, currently up to 60% porosity in AlSi10Mg, using the balling effect. This eliminates the need for time-consuming digital pre-processing work.

[ 2 ] Lubkowitz, V.; Reothia, N. & Zanger, F. (2021), "Enhancement of Groove Turning Performance by Additively Manufactured Tool Holders with Internal Cooling Channels and Combined Cooling Strategies". SSRN, Elsevier, pp. 50-55. https://dx.doi.org/10.2139/ssrn.3922719
Abstract
Additively manufactured machining tools allow new concepts for internal cooling channels. Commercially available grooving tool holders with two connected channels carry fluids to the cutting zone and tool flank. This study compares commercial and newly designed tool holders. The new design provides two separate channels with the option to carry different media to the primary and secondary cutting edge. Different cooling strategies (flood cooling (FC), cryogenic cooling (LN2), minimum quantity lubrication (MQL), and combinations of them) were performed on the material Ti-6Al-4V (3.7165) to validate the performance and lifetime increase of the tool inserts. The test results show that the secondary edge cooling as well as combined cooling strategies reduce wear by up to 12 %. Neither LN2 nor LN2 combined with MQL are suitable for this process and tool design, but the combination of FC and MQL leads to a cutting length greater than 10000 m at 20 % higher productivity and the same reproducible surface roughness Rz of approx. 1 ?m compared to commercially available grooving tool.