Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Cylindrical External Plunge Grinding of AISI 4340 steel with interrupted geometry
Submission Author:
Eduardo Carlos Bianchi , SP
Co-Authors:
Diego Mello, Hamilton José de Mello, Rafael Lemes Rodriguez, José Claudio Lopes, Eduardo Carlos Bianchi
Presenter: Rafael Lemes Rodriguez
doi://10.26678/ABCM.COBEM2017.COB17-2857
Abstract
Grinding is one of the most used finishing processes in the metal cutting industry. However, the major part of ground workpieces is provided with continuous cutting. The manufacturing of precision workpieces using discontinuous cutting is common in several mechanical components, such as in the automotive industry. Few studies have been done on what happens to the workpiece’s quality (roundness errors and roughness), and to the grinding wheel wear, when rotational symmetric parts are manufactured with interrupted cutting. The purpose of this paper is to study the grinding of workpieces (discs) whose geometry provides interrupted cutting (grooves in the discs). For this, a conventional aluminum oxide grinding wheel with resinoid bond was used in cylindrical external plunge grinding to grind grooved discs made of AISI 4340 steel, quenched and tempered, under conventional cooling. The testing samples have two, six and twelve grooves. The samples were ground with three different infeed rates in the plunge grinding: 0.25, 0.50 and 0.75 mm/min. For the same number of grooves, the surface roughness, roundness errors and diametrical grinding wheel wear tended to rise as the infeed rate increased. A slight improvement was observed in the surface roughness from testing samples with six grooves to testing samples with twelve grooves. The roundness errors increase was proportional to the grooves number and the infeed rates. The diametrical grinding wheel wear increase was more sensitive and proportional to the grooves number and to the infeed rates.
Keywords
Cylindrical external plunge grinding, interrupted cutting, conventional cooling
