Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Drilling of High Strength Grey Iron, Grade 300, with Refined Graphite and Mo Addition
Submission Author:
Aline Elias da Silva , GO
Co-Authors:
Alcione Reis, Álisson Rocha Machado, Wilson Luiz Guesser, Aline Elias da Silva
Presenter: Álisson Rocha Machado
doi://10.26678/ABCM.COBEM2017.COB17-0098
Abstract
The present study aims to evaluate the machinability of FC-300 gray cast iron – high resistance class with refined graphite and addition of molybdenum, for use in engine cylinder heads, compared with a material already used for this purpose, the FC-250 gray cast iron. The drilling process was been chosen for the tests because this process is widely used in the manufacture of engine heads. A drill with steel body and indexable cemented carbide tips were used in the experiments. The tool life, with identification of the tool wear mechanisms, the thrust force and torque and quality of machined holes (roughness, roundness and cylindricity) were the output variables considered. To assist in the discussion of the results the materials were characterized according to the interlamelar spacing and microhardness of the pearlite matrix, to the number of eutectic cells and to the distribution of inclusions of manganese sulfide. In general, the results show that FC-300 iron showed the poorer machinability than the FC-250 and that there are good relationships between the microstructural characteristics and their machinability.
Keywords
machinability, cast iron, microstructural characteristics, Drilling, tool wear
