Analysis of interference fit joints formed by thermal drilling technology with CNC process control

  • 1 Technical University of Košice, Faculty of Mechanical Engineering, Department of Technology, Materials and Computer Supported Production, Slovakia


The paper focuses on the evaluation of the quality of joints of thin-walled dissimilar overlapped materials, formed by thermal drilling without a screw. The shaped interference fit joint is formed by simultaneously forming both overlapped materials, preheated by the friction of a flowdrill tool, and forming a pair of embedded concentric bushings. The joints were made on a CNC milling centre, at constant speed, with tool feed being the only variable. Three tool movement strategies – three movement schemes – were tested. By evaluating the quality of the joints using metallographic sections, the optimum tool movement strategy was selected.



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