Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
PERFORMANCE OF COATED CEMENTED CARBIDE DRILLS IN DRILLING OF GRAY CAST IRON UNDER DIFFERENT LUBRI-COOLING CONDITIONS
Submission Author:
Leonardo Rosa Ribeiro da Silva , MG
Co-Authors:
Eder Silva Costa, Pedro Henrique Pires França, CARLA RAMOS, Wisley Sales, Álisson Rocha Machado, Leonardo Rosa Ribeiro da Silva
Presenter: Leonardo Rosa Ribeiro da Silva
doi://10.26678/ABCM.COBEM2017.COB17-1133
Abstract
This paper aims at analyzing the performance of coated (TiN, TiAlN, TiAlCrN) cemented carbide drills with 6 mm of diameter, in machining of gray cast iron. The input variables, besides the coatings, were the hole length (8, 14 and 20 mm), the lubri-cooling system (dry drilling, application of minimum quantity lubrication-MQL, conventional overhead flood cooling and compressed air) and the cutting speed (25 and 50 m/min). The output parameters considered were the trust force (Fz) and torque (Mz). ANOVA was used to evaluate the results and with a reliability index of 95%, it was fond that the lubri-cooling system was the most significant variable that affect the thrust force, considering both the isolated effect and interactions. The length of the hole, considering only its isolated effect, was the most influential variable in the torque, however, when considering the interactions, the combination of the lubri-cooling system with the drill coating overcame the effect of the drilling length. Among the tested lubri-cooling system, dry drilling was the condition that most increased the thrust force and torque and the machining with compressed air, in general, was the condition that most reduced them. Finally, in relation to the performance of the coatings, TiAlCrN and TiAlN drills, in general, gave smaller values of Fz and Mz, respectively.
Keywords
Drill coating, Feeding Force, Torque, Minimum amount of cutting fluid, Drilling depth
