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Analysis of surface layer characteristics for sequential cutting operations

Abstract For manufacturing processes like milling, broaching and skiving tools with multiple cutting edges are used. The geometry and the characteristics of the machined components are the result of sequential cuts. A finite element model is built up including the sequential cutting by transferring component states between work piece models. The model is validated by comparing residual stresses between numerical and experimental results. Small element sizes allow for a detailed resolution of quantities describing the component state. Characteristics of the specific depth profiles are used for the analysis of residual stresses. The influence of process parameters and the number of simulated sequential cuts are examined. Sequential cuts show an influence on surface residual stresses. Residual stresses decrease for low cutting velocities and slightly increase for high cutting velocities. Tensile stresses also reach to deeper areas of the surface layer with increasing number of cuts. Compressive stresses pass through a significant maximum before decreasing to a constant value. A steady stress state is identified after ten sequential cuts.