Surface roughness model for worn inserts of face milling: Part II - An empirical model

In Part I of this research various factors that affect the work piece surfa ce roughness were studied. There was an obvious trend showing that the roug hness of face-milled surfaces changes with tool service time. In this paper Part II, a regression math model has been developed to describe the roughn ess change. Additional tests were conducted to confirm the model. It was fo und that roughness is a quadratic function of tool service time. Numerous f actors affect surface roughness. These influences can be accounted for by t he coefficients of the quadratic function. For a specific application, a re gression can be determined from results of a sim pie test. Tool life can be predicted knowing the quadratic function and roughness specification.