Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Comparative analysis of two CBN grinding wheels performance in nodular cast iron plunge grinding
Submission Author:
Eduardo Carlos Bianchi , SP
Co-Authors:
Lucas de Martini Fernandes, José Claudio Lopes, Roberta Silveira Volpato, Paulo Aguiar, Anselmo Diniz, Hamilton José de Mello, Eduardo Carlos Bianchi
Presenter: Lucas de Martini Fernandes
doi://10.26678/ABCM.COBEM2017.COB17-2789
Abstract
This research analysed and compared the output parameters in cylindrical grinding of nodular cast iron GGG-70 (medium hardness of 270 HB) using two CBN grinding wheels with same specifications and characteristics, but presenting an accentuated difference on the abrasive grains’ friability. The various applicability attributed to the nodular cast iron are due to its versatility in respect of mechanical properties just by the application of heat treatment, without adding alloying elements. Also, due to its high fluidity, the part can be very close to the final dimensions, being necessary in most cases only finishing processes. Generally grinding gives the part its final form. To optimize cost production, machining processes became the focus of scientists and engineers. The correct selection of the grinding wheel could determine the success of an operation as its properties influence productivity and workpiece quality decisively. In this way, the performance of each grinding wheel was analysed taking into account the results of average surface roughness, average power and G-ratio (obtained through the diametrical wheel wear). It was observed that the less friable wheel produced better surface roughness and less wheel wear than the more friable wheel, although the average power on the process was higher on the more friable wheel, what can be explained by the constant creation of new cutting edges, facilitating material removal.
Keywords
Cylindrical grinding, CBN, Nodular Cast Iron, Friability
