부산대학교 도서관

Simulation of manufacturing processes also called virtual manufacturing plays a key role for the optimisation of productivity. Among all the manufacturing processes, machining operations are often unavoidable because most of the mechanical parts need to be machined during their production cycle, at least for finishing operations. The development of machining simulation is still challenging due to large strains, strain rates and temperatures needing complex material flow stress laws for example. In order to model industrially relevant situations, macroscopic approaches are often used to keep a reasonable simulation time. The simulation of milling operations at a macroscopic level combines a mechanistic model of the cutting forces, a numerical model of the dynamic response of the machine tool and a geometric model predicting the shape of the machined part. A numerical integration procedure is used to obtain the time history of the forces and the vibrations occurring during machining. This paper presents two different approaches for the consideration of the cutting force into the integration procedure and discusses the time step selection used to perform this numerical integration. By taking the evolution of the cutting force into account through a single integration step, it is possible to increase the time step. For a given precision, it is possible to reduce the computation time by a factor up to ten using this approach. [ABSTRACT FROM AUTHOR]