COMPUTATIONAL ALGORITHM BASED ON ALTINTAS MODEL FOR CUTTING DYNAMICS OF END MILLING PROCESS

Gabriel Bezerra de Menezes (1) , Anna Carla Araujo (1)

1 UFRJ - Universidade Federal do Rio de Janeiro [Brasil] = Federal University of Rio de Janeiro [Brazil] = Université fédérale de Rio de Janeiro [Brésil]

The study of cutting dynamics is important to predict regenerative vibration to avoid tool breakage and bad surface quality. In this study the critical stability condition of an end milling operation is simulated based on Altintas Model for dynamics of metal cutting. This analytical model considers the milling tool and the workpiece as system of two degrees of freedom. The required routine calculates the depth of cut that defines the stable and unstable region for all the possible spindle speed disposable on the machine. Using all the results for the limit depth of cut is possible to build the diagram of stability lobes. The algorithm considers as input parameters: the tool geometry, workpiece material, specific cutting forces and dynamic coefficients of the tool. Using the algorithm it is possible to evaluate the contribution of each parameter to reduce chatter and in this study some parameter contribution are analyzed by comparing the different lobes diagrams. Material removal rate is considered to compare different situations for the exit angle. For the specific parameters described, it was possible to find one value for the exit angle, and consequently the width of cut, that maximizes the removal rate without chatter.

Mots clés: Metal cutting; End milling; Chatter; Vibration stability

Domaines: Mécanique [physics.med-ph]

Gabriel Bezerra de Menezes, Anna Carla Araujo. COMPUTATIONAL ALGORITHM BASED ON ALTINTAS MODEL FOR CUTTING DYNAMICS OF END MILLING PROCESS. 22nd International Congress of Mechanical Engineering (COBEM 2013), Nov 2013, Ribeirão Preto, Brazil. ⟨hal-03214832⟩