Preliminary notesThis paper aims to establish the parameters of optimization and geometrical improvements for the micro-geometry of solid carbide drills through the application of sand blasting process. The effects of sand blasting over the cutting edge and also upon the micro geometry of the tool body are to be taken into consideration. This process is one of the most common ones used in the solid carbide tool fabrication, being implemented in various ways, not always achieving the best results. The micro geometrical optimization of the cutting edge is concentrated on two important parameters, edge radius and K-factor alignment, both of these having a critical role in the tool life and over the cutting parameters. The improvement of this optimization process can also be achieved by combining it with other known processes aiming at the same result. Keywords: cutting edge optimization; micro geometrical optimization; sand blasting; solid carbide drill Primjena abrazivnog postupka pjeskarenja u mikro geometrijskoj optimizaciji oštricePrethodno priopćenje Cilj je ovoga članka odrediti parametre optimizacije i geometrijskih poboljšanja u mikro geometriji svrdla od tvrdog karbida primjenom postupka pjeskarenja. Treba uzeti u obzir učinke pjeskarenja na oštricu i na mikro geometriju tijela alata. Taj postupak je jedan od najuobičajenijih postupaka u izradi alata od tvrdog karbida koji se primjenjuje na različite načine, ne uvijek s najboljim rezultatima. Mikro geometrijska optimizacija oštrice usmjerena je na dva važna parametra, polumjer oštrice i K-faktora centriranja, koji su od odlučujuće važnosti za vijek trajanja alata i parametre rezanja. Ovaj se postupak optimizacije može poboljšati i kombiniranjem s drugim poznatim postupcima čiji je cilj postizanje istog rezultata.
This paper aims to establish the mechanism of quality optimization and geometrical improvements for the micro-geometry of solid carbide drills. The purpose of microgeometrical optimization of the cutting edge tools of drills is to improve tool live, cutting speeds and minimizing cutting forces. The most important geometrical feature when drilling with solid carbide drills is the radius or chamfer of the cutting edge, which can be achieved through brushing under a certain angle. Improving this procedure by adding another step, soft granulated polishing, can positively influence on the cutting parameters and decrease the wear effects.
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