A SYSTEMS-THEORY APPROACH TO MODELING OF CUTTING TEMPERATURE WITH EXPERIMENTAL IDENTIFICATION

A parametric model of the thermal process generated in metal cutting i s developed,in a theoretical system approach. A family of transfer fun ctions of a piecewise linear system is provided for analysing both the transient and the steady-state response of the cutting temperature to inputs of cutting speeds. The influence of tool wear on the raising b f the cutting temperature is incorporated in the global sensitivity of the model parameters towards the working conditions. A standard therm ocouple embedded in the tool holder is used to monitor the thermal pro cess in continuous and interrupted turning experiments. A model assess ment based on an analysis of parameter estimates is obtained after an extensive identification procedure. The model can be referred to for i mplementing real-time control of the cutting process. Copyright (C) 19 96 Elsevier Science Ltd