Metrology Influence on the Cutting Modelisation

TL;DR

This paper explores how precise measurement and strain gradient theory can improve the modeling of complex phenomena in high-speed machining, considering the effects of high strain and temperature on materials.

Contribution

It develops a theoretical behavior law based on strain gradient theory tailored to high-speed cutting phenomena, integrating experimental measurements.

Findings

Mechanical actions measured with a six-component dynamometer

Flux and temperature data collected at the cutting tool tip

A new theoretical behavior law for cutting processes proposed

Abstract

High speed machining has been improved thanks to considerable advancement on the tools (optimum geometry, harder materials), on machined materials (increased workability and machining capacity for harder workpieces) and finally on the machines (higher accuracy and power at the high speeds, performances of the numerical control system). However at such loading velocities, the cutting process generates high strain and high-speed strain which cause complex, various and irreversible phenomena in plasticity. These phenomena are comprehended through the complete measurement of the mechanical actions using a six-component dynamometer and flux and temperatures measurements at the tip of the cutting tool. Balanced energy assessments are the starting points of our reflection on the machining modelling. The modelling of these phenomena and the material behaviour under this type of loading requires a suitable theoretical approach. The main points of the strain gradient theory are developed. A theoretical behaviour law adapted to the cutting phenomena is then expressed.