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Mesoplasticity Approach to Studies of the Cutting Mechanism in Ultra-precision Machining

Chinese Journal of Mechanical Engineering 2014年第2期27卷 219-228页

作者： LEE WB Rongbin WANG Hao TO Suet CHEUNG Chi Fai CHAN Chang Yuen Partner State Key Laboratory of Ultra-precision Machining Technology The Hong Kong Polytechnic University

There have been various theoretical attempts by researchers worldwide to link up different scales of plasticity studies from the nano-, micro- and macro-scale of observation, based on molecular dynamics, crystal plasticity and continuum mechanics. Very few attempts, however, have been reported in ultra-precision machining studies. A mesoplasticity approach advocated by Lee and Yang is adopted by the authors and is successfully applied to studies of the micro-cutting mechanisms in ultra-precision machining. Traditionally, the shear angle in metal cutting, as well as the cutting force variation, can only be determined from cutting tests. In the pioneering work of the authors, the use of mesoplasticity theory enables prediction of the fluctuation of the shear angle and micro-cutting force, shear band formation, chip morphology in diamond turning and size effect in nano-indentation. These findings are verified by experiments. The mesoplasticity formulation opens up a new direction of studies to enable how the plastic behaviour of materials and their constitutive representations in deformation processing, such as machining can be predicted, assessed and deduced from the basic properties of the materials measurable at the microscale.

关键词： ultra-precision machining cutting mechanism mesoplasticity shear angle prediction size effect,micro-cutting force variation high frequency tool-tip vibration

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