Avaliação de tipos e mecanismos de desgastes de broca de metal duro revestidas por TiN e TiAlN na furação do aço ABNT 1045

Abstract

In the manufacturing industry the drilling process is widely used, in the great majority of the work parts manufactured at least one hole they have, either for their fixation, for lubrication, tension relief among others. For this reason, it is important to know the performance of drills, in terms of material and coating, since they can be machined with less time, using great feed rates and cutting speeds. However, during this process, the tools heat and suffer high wear, altering the desired dimensions of the holes, in order to minimize these effects are used the cutting fluids. The present work evaluated the life and wear mechanisms of TiN and TiAlN coated full length ultra-fine carbide drills by the CVD process in the AISI 1045 steel drilling at three cutting speeds 60, 120 and 180 m/min, with application of cutting fluid Blasocut BC 40 NF in the minimum quantity of lubrication (MQL), flow rate 74 ml/h and in overhead position ME-1 fluid with 5% concentration and flow 1269 l/h. The wear of the TiAlN coated drills showed better results than the TiN, compared to the cutting speed at 120 m/min obtained better performance except for the TiN coating with MQL method. Regarding to the wear mechanism, the adhesion phenomena was the dominant. Adhesion and abrasion were the dominant wear mechanisms in the whole work.