| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 96 === To enhance the implementation of micro milling, it is necessary to clearly understand the dynamic characteristics of micro milling so that proper machining parameters can be used to meet the requirements of application. Through calculating the instantaneous projection area of cutting, a new cutting force model of micro-milling was developed in this study. According to the instantaneous rotation trajectory of cutting edge, the cutting area projected to xy-plane was divided into three regions, and determined by rectangular integral method. Subsequently, the machining coefficients for a small axial depth of cut were experimentally investigated. Finally, the cutting force of micro-milling for different radial depth of cut and axial depth of cut can be accurately determined based on the proposed cutting force model. In the derivation, the effects of minimum chip thickness and the elastic deformation of material in the cutting area were taken into account. Micro-milling experimental results showed that the force model can be used for different micro milling processes. Comparing to the measured cutting force, the predicted cutting force had about 20%-30% errors.
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