Patent ID: 7240562

Claim:
A method for calculating a tool chip friction, τ rake , and a position of stagnation, θ s , for a cutting tool, comprising: measuring a ratio of cutting force, F c , to thrust force, F t ; measuring a chip thickness, h ch , produced by applying the cutting tool to a material; estimating initial values for the tool chip friction, τ rake , and position of stagnation, θ s ; calculating the tool chip friction, τ rake , and the position of stagnation, θ s , to satisfy, [ ( F c F t ) pr - ( F c F t ) ex ] 2 + [ ( h ch h c ) pr - ( h ch h c ) ex ] 2 ≤ 10 - 12 ; and applying the calculated tool chip friction, τ rake , and the calculated position of stagnation, θ s , to a model of constitutive behavior for the material.