Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Analysis of the influence of the hole depth on the geometric quality of the machined part, when the cutting fluid and the machining parameters are varied
Submission Author:
CARLA RAMOS , SP
Co-Authors:
Eder Silva Costa, Pedro Henrique Pires França, Leonardo Rosa Ribeiro da Silva , Wisley Sales, Álisson Rocha Machado, CARLA RAMOS
Presenter: CARLA RAMOS
doi://10.26678/ABCM.COBEM2017.COB17-1834
Abstract
The purpose of this work is to study the effect of the length of the hole on the surface roughness (Ra and Rz parameters), thrust force (Fz) and torque (Mz) in drilling of gray cast iron FC 300. Blind holes of 10 mm of diameter were drilled with five different drilling lengths (10, 15, 20, 25 e 32 mm) under different cutting speeds and feed rates. Twist drills coated with TiAlN were used in tests using different lubri-cooling systems: atmospheric air (dry cutting), minimum quantity lubrication-MQL and flood cooling. Analysis of Variance (ANOVA) with a reliability index of 95% was employed to detect and classify the input variables that are statistically significant for the roughness parameters, thrust force and torque. The lubri-cooling, in general, was the second most important variable affecting all the output variables studied. MQL and flood cooling systems presented similar surface roughness when drilling shallow holes (10 and 15 mm). However, for deep holes (25 and 32 mm) the MQL system produced better surface roughness than the flood cooling.
Keywords
hole length, lubri-cooling system, surface roughness, thrust force, Torque, gray cast iron machining
