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Modelling of the dynamic tool-chip interface in metal cutting

By Hong Sheng Qi and B. Mills

Abstract

NoThe formation of tribo-layers during machining is very common phenomena, especially when machining `free machining¿ steels. Several kinds of tribo-layers formed in metal cutting processes have been reported, layers of inclusions from the workpiece, oxide layers due to chemical reaction, plastic deformation layers, material transfer layers (MTLs) or built-up layers (BULs). A new tool¿chip contact model is proposed to explain the tribo-layer phenomena, which considers the nature of the shear strain rate distribution in the secondary deformation zone. A shear strain rate distribution in this zone having a shape similar to that found in the preliminary zone is proposed. A cutting interface (CI) is defined and this interface is at different location to the material boundary of tool and chip (MBTC). This difference is a key factor in the formation of the tribo-layer in the secondary deformation zone. This model can be used in improving tool wear prediction and the estimation of tool life

Topics: Machining, Shear Strain Rate, Secondary Shear Zone, Tribo-Layer, Cutting Interface
Year: 2003
DOI identifier: 10.1016/S0924-0136(03)00072-4
OAI identifier: oai:bradscholars.brad.ac.uk:10454/4081
Provided by: Bradford Scholars
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