Modeling and identification of cutting forces in milling of Carbon Fibre Reinforced Polymers

摘要

Mechanistic cutting force models are commonly used to compute milling forces in terms of the machining parameters such as feedrate, axial, and radial depths of cut. In isotropic (e.g. metallic) materials, the parameters of mechanistic models are treated as constants which which are identified using well-established experimental procedures. Mechanics of chip formation in anisotropic Carbon Fibre Reinforced Polymers (CFRP) varies depending on fibre cutting angle, which continuously changes as the tool rotates in milling operations. To address this variation, a mechanistic model with parameters that depend on fibre cutting angle is proposed. Also, a new experimental method is presented to identify the parameters of the proposed model. The model parameters are assumed to be periodic functions of fibre cutting angle, and the Fourier coefficients of the periodic function are identified from the milling forces measured during a set of milling operations at various feedrates and fibre orientations. The experimental validation of the presented force modelling approach confirms its accuracy to predict forces in milling of Unidirectional as well as Multi-directional CFRP.