Univ. Prof. Dr. Ing.

Bergs, Thomas

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  • Publication
    Experimental investigation of abrasive properties in waterjet machining
    ( 2021)
    Schüler, Manuel
    ;
    Dadgar, Mohammad
    ;
    Herrig, Tim
    ;
    Klink, Andreas
    ;
    Bergs, Thomas
    Abrasive waterjet (AWJ) machining has proven to be one of the most flexible non-conventional production techniques for difficult-to-machine materials. However, the prediction of process results is challenging since multiple physical processes occur simultaneously. Until now, the use of alternative abrasive material for special applications has received limited attention. In this work, different solid materials of altered shape and mechanical properties were used to analyze the physical phenomena experimentally. A ceramic and a steel abrasive material of either circular or angular geometry were used. The experiments were conducted by AWJ controlled-depth machining on 42CrMo4 steel in various structural modifications regarding the interference of particle interactions. Furthermore the study aims to gain a fundamental understanding of the AWJ erosion process of different abrasive grit for a better prediction and optimization of AWJ machining, in particular for future applications.
  • Publication
    Automotive hybrid design production and effective end machining by novel abrasive waterjet technique
    ( 2021)
    Schüler, Manuel
    ;
    Heidrich, Daniel
    ;
    Herrig, Tim
    ;
    Fang, Xiangfan
    ;
    Bergs, Thomas
    Hybrid designs with the combination of metal and long fiber reinforced thermoplastics (LFT) offer a great opportunity to reduce component weight for automotive applications. Production costs are typically high due to complex processes and challenging end machining. A complete manufacturing process chain for simultaneous hybrid design production is presented. Hybrid forming, a manufacturing process combining metal sheet forming, LFT compression molding and bonding, was developed to manufacture an automotive lightweight component, finally end machined by innovative waterjet techniques. Besides optimizing waterjet end machining strategies, waterjet controlled-depth machining was used to remove LFT material selectively, resulting in increased hybrid production flexibility.