Parameter Approximation for Tool Life Equations

Abstract

The aim of this research is to investigate a model for estimating tool life (Kundrák, 1996) during high speed hard turning based on the relationship between the wear progress (speed) and time. The tool life equation is valid in the whole cutting speed range for a given feed rate and depth of cut, and has two extreme values. Here the coefficients A, B and K of the equation are calculated under different cutting conditions and the results are in good agreement with experimental values. It is also shown that different feed rate and depth of cut values change the location of the two extreme values of the tool life curve. A Matlab model was developed to determine the parameters of the tool life equation. Furthermore the properties of estimated parameters were investigated by Statistica 9 program package.