Study of Cutting Forces Models for Micro-Cutting Based on Strain Gradient

Wen Ge Wu; H. Xiao; H.F. Wang; T. Xiao

doi:10.4028/www.scientific.net/KEM.499.307

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Study of Cutting Forces Models for Micro-Cutting Based on Strain Gradient

Abstract:

In micro-cutting process, it is very significant to study the variations of cutting forces and the factors affecting the forces for determining the machining parameters and for improving the performance of machining systems. The remarkable characteristic of micro-Cutting is that cutting parameters level closing to the crystal grain msize of material. Though, the prediction formula of micro-cutting forces should reference to strain gradient plasticity theory in formula construction, while cutting edge radius had been regard as a important parameters in the process of micro-cutting. The study show that, strain gradient reaction will be decreased by feed rate’s reducing in process, approximate expression of the strain gradient by the derivative of chip deformation rate, and the micro-cutting forces include hear flow stress, tensile flow stress ,and the friction force of rake surface.