Optimization of geometric parameters of hard metal micro drils to increase tool life and performance of drilling package of printed circuit boards
Journal Title: Proceedings in Manufacturing Systems - Year 2015, Vol 10, Issue 3
Abstract
In the presented work, there are investigated the changes of power characteristics of deep drilling package of printed circuit board’s hard-alloy micro drills depending on the drilling depth, cutting data and geometry of the drill. In particular are studied the nature of changes in axial efforts and torque depending on the drilling depth drill with different inclinations of the spiral grooves using specially designed highly sensitive devices, enabling direct measurement method. On the basis of the analysis of results of research are made the changes in geometry of the existing standard drills. New construction of micro drills vari-angle spiral grooves in such a way that the angle is the maximum value at the top of the drill and uniformly decreases towards the end of the working parts are suggested. The drills are manufactured with different inclinations of the spiral grooves. On the basis of experiments of them chosen more for its close standing power rates to the standard drill bit and its comparative test with a standard drill bit, bringing them up to the breakage, thanks to which the proven advantages of drills new design. Taking into account the results of the experiments, there are suggested drill elongated structures to improve performance by increasing the processing drilling depth and accordingly the number of plates in the package of printed circuit boards.
Authors and Affiliations
Raul TURMANIDZE, Vasili BACHANADZE, Giorgi POPXADZE
Keywords
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